Add raspbootin64 tutorial and reshuffle order
Andre Richter
6 years ago
parent
32ef64b36e
commit
7273745da6
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#
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# Copyright (C) 2018 bzt (bztsrc@github)
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#
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# Permission is hereby granted, free of charge, to any person
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# obtaining a copy of this software and associated documentation
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# files (the "Software"), to deal in the Software without
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# restriction, including without limitation the rights to use, copy,
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# modify, merge, publish, distribute, sublicense, and/or sell copies
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# of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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# DEALINGS IN THE SOFTWARE.
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#
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#
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SRCS = $(wildcard *.c)
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OBJS = $(SRCS:.c=.o)
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CFLAGS = -Wall -O2 -ffreestanding -nostdinc -nostdlib -nostartfiles
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all: clean kernel8.img
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start.o: start.S
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aarch64-elf-gcc $(CFLAGS) -c start.S -o start.o
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%.o: %.c
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aarch64-elf-gcc $(CFLAGS) -c $< -o $@
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kernel8.img: start.o $(OBJS)
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aarch64-elf-ld -nostdlib -nostartfiles start.o $(OBJS) -T link.ld -o kernel8.elf
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aarch64-elf-objcopy -O binary kernel8.elf kernel8.img
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clean:
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rm kernel8.elf *.o >/dev/null 2>/dev/null || true
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@ -1,45 +0,0 @@
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Oktatóanyag 14 - Raspbootin64
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=============================
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Mivel folyton iragatni az SD kártyát strapás, és nem tesz jót a kártyának, ezért egy olyan kernel8.img-t készítünk,
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ami a soros vonalról fogja betölteni az igazi kernel8.img-t.
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Ez az oktatóanyag a jól ismert [raspbootin](https://github.com/mrvn/raspbootin) átírása 64 bitre.
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A betöltőprogram egyik felét adja csak, a kernel fogadót, ami az RPi-n fut. A másik fél, a PC-n futó küldő,
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megtalálható az eredeti forrásban [raspbootcom](https://github.com/mrvn/raspbootin/blob/master/raspbootcom/raspbootcom.cc) néven.
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Ha Windowsos gépekről is szeretnél kernelt küldeni, akkor javaslom inkább a John Cronin féle átiratot, a
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[raspbootin-server](https://github.com/jncronin/rpi-boot/blob/master/raspbootin-server.c)-t, ami natív Win32 API-t használ.
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Ezen kvül, [@milanvidakovic](https://github.com/milanvidakovic) volt olyan jó fej, hogy megosztotta az általa írt [Java-s kernel küldő](https://github.com/milanvidakovic/Raspbootin64Client)t.
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Hogy az új kernelt ugyanoda tölthessük be, el kell mozdítanunk a kódunkat az útból. Ezt chain loading-nak hívják, amikor
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az első kód ugyanarra a címre tölti be a második kódot, ezért az utóbbi azt hiszi, a firmware töltötte be.
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Hogy ezt megvalósítsuk, egy alacsonyabb címre linkeljük a kódot, és mivel a GPU ettől függetlenül a 0x80000-ra tölt be,
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nekünk kell a módosított címre másolnunk magunkat. Amikor végeztünk, a 0x80000-as címen lévő memóriának használaton
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kívülinek kell lennie. Ezt a következő paranccsal ellenőrizheted:
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```sh
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$ aarch64-elf-readelf -s kernel8.elf | grep __bss_end
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27: 000000000007ffe0 0 NOTYPE GLOBAL DEFAULT 4 __bss_end
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```
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Ajánlott a kódunkat minimalizálni, mivel úgyis figyelmen kívül hagyja az újonnan betöltendő kód. Ezért kivettem az
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`uart_puts()` és még néhány eljárást, így sikerült a teljes méretet 1024 bájt alá csökkenteni.
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Start
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-----
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Először is elmentjük a regiszter paramétereket. Hozzáadtam egy ciklust, ami átmásolja a kódunkat arra a címre, ahová
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vártuk, hogy betöltődjön. Végül meghívjuk a relokált C kódot. Mivel a gcc RIP-relatív ugrást generál, nekünk kell a
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relokálást hozzáadni a címhez.
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Linker
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------
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Másik címre linkelünk ebben a példában. Hasonlóan a bss méret kiszámításához, ugyanúgy meghatározzuk a kód
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méretét is, amit másolnunk kell.
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Main
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----
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Kiírjuk, hogy 'RBIN64', majd beolvassuk az új kernelt a soros vonalról, pontosan oda, ahová a start.elf is töltötte volna.
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Majd visszaállítjuk a regiszterparamétereket és átadjuk a vezérlést az új kernelre abszolút címzést használva.
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@ -1,45 +0,0 @@
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Tutorial 14 - Raspbootin64
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==========================
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Because changing SD card is boring and also to avoid potential SD card damage, we create a kernel8.img that will
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load the real kernel8.img over serial.
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This tutorial is a rewrite of the well known serial boot loader, [raspbootin](https://github.com/mrvn/raspbootin) in 64 bit.
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I only provide one part of the loader, the kernel receiver, which runs on the RPi. For the other
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part, the sender, which runs on your PC see the original [raspbootcom](https://github.com/mrvn/raspbootin/blob/master/raspbootcom/raspbootcom.cc) utility.
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If you want to send kernels from a Windows machine, I suggest to take a look at John Cronin's rewrite,
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[raspbootin-server](https://github.com/jncronin/rpi-boot/blob/master/raspbootin-server.c) which can be compiled for the Win32 API.
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Even more, [@milanvidakovic](https://github.com/milanvidakovic) was kind to share a [Java version](https://github.com/milanvidakovic/Raspbootin64Client) of the kernel sender with you.
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In order to load the new kernel to the same address, we have to move ourself out of the way. It's called chain
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loading: one code loads the next code to the same position in memory, therefore the latter thinks it was loaded
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by the firmware. To implement that we use a different linking address this time, and since GPU loads us to 0x80000
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regardless, we have to copy our code to that link address. When we're done, the memory at 0x80000 must be free to use.
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You can check that with:
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```sh
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$ aarch64-elf-readelf -s kernel8.elf | grep __bss_end
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27: 000000000007ffe0 0 NOTYPE GLOBAL DEFAULT 4 __bss_end
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```
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We also should minimize the size of the loader, since it will be regarded by the newly loaded code anyway.
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By removing `uart_puts()` and other functions, I've managed to shrink the loader's size below 1024 bytes.
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Start
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-----
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We have to save the arguments in registers passed by the firmware. Added a loop to relocate our code to the
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address it should have been loaded to. And last, since gcc generates RIP-relative jumps, we must adjust the
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branch instruction to jump to the relocated C code.
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Linker
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------
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We use a different linking address this time. Similarly to bss size calculation, we calculate our code's size to
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know how many bytes we have to copy.
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Main
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----
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We print 'RBIN64', receive the new kernel over serial and save it at the memory address where the start.elf would
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have been loaded it. When finished, we restore the arguments and jump to the new kernel using an absolute address.
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@ -1,45 +0,0 @@
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/*
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* Copyright (C) 2018 bzt (bztsrc@github)
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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*/
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#define MMIO_BASE 0x3F000000
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#define GPFSEL0 ((volatile unsigned int*)(MMIO_BASE+0x00200000))
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#define GPFSEL1 ((volatile unsigned int*)(MMIO_BASE+0x00200004))
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#define GPFSEL2 ((volatile unsigned int*)(MMIO_BASE+0x00200008))
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#define GPFSEL3 ((volatile unsigned int*)(MMIO_BASE+0x0020000C))
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#define GPFSEL4 ((volatile unsigned int*)(MMIO_BASE+0x00200010))
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#define GPFSEL5 ((volatile unsigned int*)(MMIO_BASE+0x00200014))
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#define GPSET0 ((volatile unsigned int*)(MMIO_BASE+0x0020001C))
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#define GPSET1 ((volatile unsigned int*)(MMIO_BASE+0x00200020))
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#define GPCLR0 ((volatile unsigned int*)(MMIO_BASE+0x00200028))
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#define GPLEV0 ((volatile unsigned int*)(MMIO_BASE+0x00200034))
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#define GPLEV1 ((volatile unsigned int*)(MMIO_BASE+0x00200038))
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#define GPEDS0 ((volatile unsigned int*)(MMIO_BASE+0x00200040))
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#define GPEDS1 ((volatile unsigned int*)(MMIO_BASE+0x00200044))
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#define GPHEN0 ((volatile unsigned int*)(MMIO_BASE+0x00200064))
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#define GPHEN1 ((volatile unsigned int*)(MMIO_BASE+0x00200068))
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#define GPPUD ((volatile unsigned int*)(MMIO_BASE+0x00200094))
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#define GPPUDCLK0 ((volatile unsigned int*)(MMIO_BASE+0x00200098))
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#define GPPUDCLK1 ((volatile unsigned int*)(MMIO_BASE+0x0020009C))
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Binary file not shown.
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/*
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* Copyright (C) 2018 bzt (bztsrc@github)
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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*/
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#include "uart.h"
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void main()
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{
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int size=0;
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char *kernel=(char*)0x80000;
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// set up serial console
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uart_init();
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// say hello. To reduce loader size I removed uart_puts()
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again:
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uart_send('R');
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uart_send('B');
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uart_send('I');
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uart_send('N');
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uart_send('6');
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uart_send('4');
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uart_send('\r');
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uart_send('\n');
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// notify raspbootcom to send the kernel
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uart_send(3);
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uart_send(3);
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uart_send(3);
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// read the kernel's size
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size=uart_getc();
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size|=uart_getc()<<8;
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size|=uart_getc()<<16;
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size|=uart_getc()<<24;
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// send negative or positive acknowledge
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if(size<64 || size>1024*1024) {
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// size error
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uart_send('S');
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uart_send('E');
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goto again;
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}
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uart_send('O');
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uart_send('K');
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// read the kernel
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while(size--) *kernel++ = uart_getc();
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// restore arguments and jump to the new kernel.
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asm volatile (
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"mov x0, x10;"
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"mov x1, x11;"
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"mov x2, x12;"
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"mov x3, x13;"
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// we must force an absolute address to branch to
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"mov x30, 0x80000; ret"
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);
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}
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@ -1,63 +0,0 @@
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/*
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* Copyright (C) 2018 bzt (bztsrc@github)
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
|
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* modify, merge, publish, distribute, sublicense, and/or sell copies
|
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* of the Software, and to permit persons to whom the Software is
|
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* furnished to do so, subject to the following conditions:
|
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*
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* The above copyright notice and this permission notice shall be
|
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* included in all copies or substantial portions of the Software.
|
||||
*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||||
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||||
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
|
||||
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
||||
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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*/
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#include "gpio.h"
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/* mailbox message buffer */
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volatile unsigned int __attribute__((aligned(16))) mbox[8];
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#define VIDEOCORE_MBOX (MMIO_BASE+0x0000B880)
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#define MBOX_READ ((volatile unsigned int*)(VIDEOCORE_MBOX+0x0))
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#define MBOX_POLL ((volatile unsigned int*)(VIDEOCORE_MBOX+0x10))
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#define MBOX_SENDER ((volatile unsigned int*)(VIDEOCORE_MBOX+0x14))
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#define MBOX_STATUS ((volatile unsigned int*)(VIDEOCORE_MBOX+0x18))
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#define MBOX_CONFIG ((volatile unsigned int*)(VIDEOCORE_MBOX+0x1C))
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#define MBOX_WRITE ((volatile unsigned int*)(VIDEOCORE_MBOX+0x20))
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#define MBOX_RESPONSE 0x80000000
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#define MBOX_FULL 0x80000000
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#define MBOX_EMPTY 0x40000000
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/**
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* Make a mailbox call. Returns 0 on failure, non-zero on success
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*/
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int mbox_call(unsigned char ch)
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{
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unsigned int r;
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/* wait until we can write to the mailbox */
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do{asm volatile("nop");}while(*MBOX_STATUS & MBOX_FULL);
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/* write the address of our message to the mailbox with channel identifier */
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*MBOX_WRITE = (((unsigned int)((unsigned long)&mbox)&~0xF) | (ch&0xF));
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/* now wait for the response */
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while(1) {
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/* is there a response? */
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do{asm volatile("nop");}while(*MBOX_STATUS & MBOX_EMPTY);
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r=*MBOX_READ;
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/* is it a response to our message? */
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if((unsigned char)(r&0xF)==ch && (r&~0xF)==(unsigned int)((unsigned long)&mbox))
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/* is it a valid successful response? */
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return mbox[1]==MBOX_RESPONSE;
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}
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return 0;
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}
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@ -1,47 +0,0 @@
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/*
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* Copyright (C) 2018 bzt (bztsrc@github)
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*
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* Permission is hereby granted, free of charge, to any person
|
||||
* obtaining a copy of this software and associated documentation
|
||||
* files (the "Software"), to deal in the Software without
|
||||
* restriction, including without limitation the rights to use, copy,
|
||||
* modify, merge, publish, distribute, sublicense, and/or sell copies
|
||||
* of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be
|
||||
* included in all copies or substantial portions of the Software.
|
||||
*
|
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||||
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||||
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||||
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
|
||||
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
||||
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
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* DEALINGS IN THE SOFTWARE.
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*
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*/
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/* a properly aligned buffer */
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extern volatile unsigned int mbox[36];
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#define MBOX_REQUEST 0
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/* channels */
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#define MBOX_CH_POWER 0
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#define MBOX_CH_FB 1
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#define MBOX_CH_VUART 2
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#define MBOX_CH_VCHIQ 3
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#define MBOX_CH_LEDS 4
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#define MBOX_CH_BTNS 5
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#define MBOX_CH_TOUCH 6
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#define MBOX_CH_COUNT 7
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#define MBOX_CH_PROP 8
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/* tags */
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#define MBOX_TAG_GETSERIAL 0x10004
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#define MBOX_TAG_SETCLKRATE 0x38002
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#define MBOX_TAG_LAST 0
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int mbox_call(unsigned char ch);
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@ -1,96 +0,0 @@
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/*
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* Copyright (C) 2018 bzt (bztsrc@github)
|
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*
|
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* Permission is hereby granted, free of charge, to any person
|
||||
* obtaining a copy of this software and associated documentation
|
||||
* files (the "Software"), to deal in the Software without
|
||||
* restriction, including without limitation the rights to use, copy,
|
||||
* modify, merge, publish, distribute, sublicense, and/or sell copies
|
||||
* of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be
|
||||
* included in all copies or substantial portions of the Software.
|
||||
*
|
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||||
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||||
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||||
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
|
||||
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
||||
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
||||
* DEALINGS IN THE SOFTWARE.
|
||||
*
|
||||
*/
|
||||
|
||||
#include "gpio.h"
|
||||
#include "mbox.h"
|
||||
|
||||
/* PL011 UART registers */
|
||||
#define UART0_DR ((volatile unsigned int*)(MMIO_BASE+0x00201000))
|
||||
#define UART0_FR ((volatile unsigned int*)(MMIO_BASE+0x00201018))
|
||||
#define UART0_IBRD ((volatile unsigned int*)(MMIO_BASE+0x00201024))
|
||||
#define UART0_FBRD ((volatile unsigned int*)(MMIO_BASE+0x00201028))
|
||||
#define UART0_LCRH ((volatile unsigned int*)(MMIO_BASE+0x0020102C))
|
||||
#define UART0_CR ((volatile unsigned int*)(MMIO_BASE+0x00201030))
|
||||
#define UART0_IMSC ((volatile unsigned int*)(MMIO_BASE+0x00201038))
|
||||
#define UART0_ICR ((volatile unsigned int*)(MMIO_BASE+0x00201044))
|
||||
|
||||
/**
|
||||
* Set baud rate and characteristics (115200 8N1) and map to GPIO
|
||||
*/
|
||||
void uart_init()
|
||||
{
|
||||
register unsigned int r;
|
||||
|
||||
/* initialize UART */
|
||||
*UART0_CR = 0; // turn off UART0
|
||||
|
||||
/* set up clock for consistent divisor values */
|
||||
mbox[0] = 8*4;
|
||||
mbox[1] = MBOX_REQUEST;
|
||||
mbox[2] = MBOX_TAG_SETCLKRATE; // set clock rate
|
||||
mbox[3] = 12;
|
||||
mbox[4] = 8;
|
||||
mbox[5] = 2; // UART clock
|
||||
mbox[6] = 4000000; // 4Mhz
|
||||
mbox[7] = MBOX_TAG_LAST;
|
||||
mbox_call(MBOX_CH_PROP);
|
||||
|
||||
/* map UART0 to GPIO pins */
|
||||
r=*GPFSEL1;
|
||||
r&=~((7<<12)|(7<<15)); // gpio14, gpio15
|
||||
r|=(4<<12)|(4<<15); // alt0
|
||||
*GPFSEL1 = r;
|
||||
*GPPUD = 0; // enable pins 14 and 15
|
||||
r=150; while(r--) { asm volatile("nop"); }
|
||||
*GPPUDCLK0 = (1<<14)|(1<<15);
|
||||
r=150; while(r--) { asm volatile("nop"); }
|
||||
*GPPUDCLK0 = 0; // flush GPIO setup
|
||||
|
||||
*UART0_ICR = 0x7FF; // clear interrupts
|
||||
*UART0_IBRD = 2; // 115200 baud
|
||||
*UART0_FBRD = 0xB;
|
||||
*UART0_LCRH = 0b11<<5; // 8n1
|
||||
*UART0_CR = 0x301; // enable Tx, Rx, FIFO
|
||||
}
|
||||
|
||||
/**
|
||||
* Send a character
|
||||
*/
|
||||
void uart_send(unsigned int c) {
|
||||
/* wait until we can send */
|
||||
do{asm volatile("nop");}while(*UART0_FR&0x20);
|
||||
/* write the character to the buffer */
|
||||
*UART0_DR=c;
|
||||
}
|
||||
|
||||
/**
|
||||
* Receive a character
|
||||
*/
|
||||
char uart_getc() {
|
||||
/* wait until something is in the buffer */
|
||||
do{asm volatile("nop");}while(*UART0_FR&0x10);
|
||||
/* read it and return */
|
||||
return (char)(*UART0_DR);
|
||||
}
|
||||
@ -1,30 +0,0 @@
|
||||
/*
|
||||
* Copyright (C) 2018 bzt (bztsrc@github)
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person
|
||||
* obtaining a copy of this software and associated documentation
|
||||
* files (the "Software"), to deal in the Software without
|
||||
* restriction, including without limitation the rights to use, copy,
|
||||
* modify, merge, publish, distribute, sublicense, and/or sell copies
|
||||
* of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be
|
||||
* included in all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||||
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||||
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||||
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
|
||||
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
||||
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
||||
* DEALINGS IN THE SOFTWARE.
|
||||
*
|
||||
*/
|
||||
|
||||
void uart_init();
|
||||
void uart_send(unsigned int c);
|
||||
char uart_getc();
|
||||
void uart_puts(char *s);
|
||||
void uart_hex(unsigned int d);
|
||||
@ -0,0 +1,86 @@
|
||||
# Tutorial 06 - Raspbootin64
|
||||
|
||||
We are now at a point where we have a running serial connection, but for each
|
||||
new feature we want to try, we still have to write and exchange the SD card
|
||||
every time.
|
||||
|
||||
As this tends to get very annoying and also to avoid potential SD card damage,
|
||||
we create a kernel8.img that will load the real kernel8.img over serial.
|
||||
|
||||
This tutorial is a rewrite of the well known serial boot loader
|
||||
[raspbootin][bootin] in 64-bit. We only provide one part of the loader, the
|
||||
kernel receiver, which runs on the RPi. For the other part, the sender, which
|
||||
runs on your PC, we will rely on the original [raspbootcom][bootcom] utility.
|
||||
|
||||
[bootin]:(https://github.com/mrvn/raspbootin)
|
||||
[bootcom]:(https://github.com/mrvn/raspbootin/blob/master/raspbootcom/raspbootcom.cc)
|
||||
|
||||
For convenience, it is already packaged in our `raspi3-utils` docker
|
||||
container. So if you are running a Linux host, it will be as easy as calling
|
||||
another Makefile target. It will be included starting with the next tutorial,
|
||||
`07_random`. You can invoke it with
|
||||
|
||||
```bash
|
||||
make raspboot
|
||||
```
|
||||
|
||||
If you want to use it with earlier versions of this tutorial, here is a bash
|
||||
command to invoke it:
|
||||
|
||||
```bash
|
||||
docker run -it --rm \
|
||||
--privileged -v /dev/:/dev/ \
|
||||
-v $PWD:/work -w /work \
|
||||
raspi3-utils \
|
||||
raspbootcom /dev/ttyUSB0 kernel8.img
|
||||
```
|
||||
|
||||
In any case, if your USB device is enumerated differently, adapt accordingly.
|
||||
|
||||
If you want to send kernels from a Windows machine, I suggest to take a look at
|
||||
John Cronin's rewrite, [raspbootin-server][w32] which can be compiled for the
|
||||
Win32 API. Even more, [@milanvidakovic](https://github.com/milanvidakovic) was
|
||||
so kind to share a [Java version][java] of the kernel sender with you.
|
||||
|
||||
[w32]:(https://github.com/jncronin/rpi-boot/blob/master/raspbootin-server.c)
|
||||
[java]:(https://github.com/milanvidakovic/Raspbootin64Client)
|
||||
|
||||
## Chain Loading
|
||||
|
||||
In order to load the new kernel to the same address, we have to move ourself out
|
||||
of the way. It's called `chain loading`: One code loads the next code to the
|
||||
same position in memory, therefore the latter thinks it was loaded by the
|
||||
firmware. To implement that, we use a different linking address this time, and
|
||||
since the GPU loads us to `0x80_000` regardless, we have to copy our code to
|
||||
that link address. When we're done, the memory at `0x80_000` is free to use. You
|
||||
can check that with:
|
||||
|
||||
```sh
|
||||
$ ./dockcross-linux-aarch64 aarch64-linux-gnu-nm kernel8 | grep reset
|
||||
000000000007ffc0 T reset
|
||||
```
|
||||
|
||||
We also should minimize the size of the loader, since it will be overwritten by
|
||||
the newly loaded code anyway. By removing `Uart::puts()` and other functions,
|
||||
we've managed to shrink the loader's size to 1024 bytes.
|
||||
|
||||
## boot_cores.S
|
||||
|
||||
First, we have to save the arguments in registers passed by the
|
||||
firmware. Second, we added a loop to relocate our code to the address it should
|
||||
have been loaded to. And last, since rustc generates RIP-relative jumps, we must
|
||||
adjust the branch instruction to jump to the relocated Rust code.
|
||||
|
||||
## Linker and Glue Code
|
||||
|
||||
We use a different linking address this time. We calculate our code's size to
|
||||
know how many bytes we have to copy.
|
||||
|
||||
Additionally, we can remove the `bss section` entirely, since our loader does
|
||||
not use any static variables.
|
||||
|
||||
## main.rs
|
||||
|
||||
We print 'RBIN64', receive the new kernel over serial and save it at the memory
|
||||
address where the start.elf would have been loaded it. When finished, we restore
|
||||
the arguments and jump to the new kernel using an absolute address.
|
||||
Binary file not shown.
@ -0,0 +1,73 @@
|
||||
/*
|
||||
* MIT License
|
||||
*
|
||||
* Copyright (c) 2018 Jorge Aparicio
|
||||
* Copyright (c) 2018 Andre Richter <andre.o.richter@gmail.com>
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in all
|
||||
* copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE.
|
||||
*/
|
||||
|
||||
#![feature(lang_items)]
|
||||
#![no_std]
|
||||
#![feature(global_asm)]
|
||||
|
||||
use core::ptr;
|
||||
|
||||
#[lang = "panic_fmt"]
|
||||
unsafe extern "C" fn panic_fmt(
|
||||
_args: core::fmt::Arguments,
|
||||
_file: &'static str,
|
||||
_line: u32,
|
||||
_col: u32,
|
||||
) -> ! {
|
||||
loop {}
|
||||
}
|
||||
|
||||
#[lang = "start"]
|
||||
extern "C" fn start<T>(user_main: fn() -> T, _argc: isize, _argv: *const *const u8) -> isize
|
||||
where
|
||||
T: Termination,
|
||||
{
|
||||
user_main().report() as isize
|
||||
}
|
||||
|
||||
#[lang = "termination"]
|
||||
trait Termination {
|
||||
fn report(self) -> i32;
|
||||
}
|
||||
|
||||
impl Termination for () {
|
||||
fn report(self) -> i32 {
|
||||
0
|
||||
}
|
||||
}
|
||||
|
||||
#[no_mangle]
|
||||
pub unsafe extern "C" fn reset() -> ! {
|
||||
extern "C" {
|
||||
fn main(argc: isize, argv: *const *const u8) -> isize;
|
||||
}
|
||||
|
||||
main(0, ptr::null());
|
||||
|
||||
loop {}
|
||||
}
|
||||
|
||||
// Disable all cores except core 0, and then jump to reset()
|
||||
global_asm!(include_str!("boot_cores.S"));
|
||||
@ -0,0 +1,83 @@
|
||||
/*
|
||||
* MIT License
|
||||
*
|
||||
* Copyright (c) 2018 Andre Richter <andre.o.richter@gmail.com>
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in all
|
||||
* copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE.
|
||||
*/
|
||||
|
||||
#![no_std]
|
||||
#![feature(asm)]
|
||||
|
||||
extern crate raspi3_glue;
|
||||
extern crate volatile_register;
|
||||
|
||||
const MMIO_BASE: u32 = 0x3F00_0000;
|
||||
|
||||
mod gpio;
|
||||
mod mbox;
|
||||
mod uart;
|
||||
|
||||
fn main() {
|
||||
let mut mbox = mbox::Mbox::new();
|
||||
let uart = uart::Uart::new();
|
||||
|
||||
// set up serial console
|
||||
if uart.init(&mut mbox).is_err() {
|
||||
return; // If UART fails, abort early
|
||||
}
|
||||
|
||||
let kernel: *mut u8 = 0x80_000 as *mut u8;
|
||||
|
||||
// Say hello
|
||||
for c in "RBIN64\r\n".chars() {
|
||||
uart.send(c);
|
||||
}
|
||||
|
||||
// Notify raspbootcom to send the kernel
|
||||
uart.send(3 as char);
|
||||
uart.send(3 as char);
|
||||
uart.send(3 as char);
|
||||
|
||||
// Read the kernel's size
|
||||
let mut size: u32 = uart.getc() as u32;
|
||||
size |= (uart.getc() as u32) << 8;
|
||||
size |= (uart.getc() as u32) << 16;
|
||||
size |= (uart.getc() as u32) << 24;
|
||||
|
||||
// For now, blindly trust it's not too big
|
||||
uart.send('O');
|
||||
uart.send('K');
|
||||
|
||||
unsafe {
|
||||
// Read the kernel byte by byte
|
||||
for i in 0..size {
|
||||
*kernel.offset(i as isize) = uart.getc();
|
||||
}
|
||||
|
||||
// Restore arguments and jump to loaded kernel
|
||||
asm!("mov x0, x25 \n\t\
|
||||
mov x1, x26 \n\t\
|
||||
mov x2, x27 \n\t\
|
||||
mov x3, x28 \n\t\
|
||||
mov x30, 0x80000 \n\t\
|
||||
ret"
|
||||
:::: "volatile");
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,139 @@
|
||||
/*
|
||||
* MIT License
|
||||
*
|
||||
* Copyright (c) 2018 Andre Richter <andre.o.richter@gmail.com>
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in all
|
||||
* copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE.
|
||||
*/
|
||||
|
||||
use super::MMIO_BASE;
|
||||
use volatile_register::{RO, WO};
|
||||
|
||||
const VIDEOCORE_MBOX: u32 = MMIO_BASE + 0xB880;
|
||||
|
||||
#[allow(non_snake_case)]
|
||||
#[repr(C)]
|
||||
struct Registers {
|
||||
READ: RO<u32>, // 0x00
|
||||
__reserved_0: [u32; 3], // 0x04
|
||||
POLL: RO<u32>, // 0x10
|
||||
SENDER: RO<u32>, // 0x14
|
||||
STATUS: RO<u32>, // 0x18
|
||||
CONFIG: RO<u32>, // 0x1C
|
||||
WRITE: WO<u32>, // 0x20
|
||||
}
|
||||
|
||||
// Custom errors
|
||||
pub enum MboxError {
|
||||
ResponseError,
|
||||
UnknownError,
|
||||
}
|
||||
pub type Result<T> = ::core::result::Result<T, MboxError>;
|
||||
|
||||
// Channels
|
||||
pub mod channel {
|
||||
pub const PROP: u32 = 8;
|
||||
}
|
||||
|
||||
// Tags
|
||||
pub mod tag {
|
||||
pub const SETCLKRATE: u32 = 0x38002;
|
||||
pub const LAST: u32 = 0;
|
||||
}
|
||||
|
||||
// Clocks
|
||||
pub mod clock {
|
||||
pub const UART: u32 = 0x0_0000_0002;
|
||||
}
|
||||
|
||||
// Responses
|
||||
mod response {
|
||||
pub const SUCCESS: u32 = 0x8000_0000;
|
||||
pub const ERROR: u32 = 0x8000_0001; // error parsing request buffer (partial response)
|
||||
}
|
||||
|
||||
pub const REQUEST: u32 = 0;
|
||||
const FULL: u32 = 0x8000_0000;
|
||||
const EMPTY: u32 = 0x4000_0000;
|
||||
|
||||
// Public interface to the mailbox
|
||||
#[repr(C)]
|
||||
pub struct Mbox {
|
||||
// The address for buffer needs to be 16-byte aligned so that the
|
||||
// Videcore can handle it properly. We don't take precautions here
|
||||
// to achieve that, but for now it just works. Since alignment of
|
||||
// data structures in Rust is a bit of a hassle right now, we just
|
||||
// close our eyes and roll with it.
|
||||
pub buffer: [u32; 10],
|
||||
registers: *const Registers,
|
||||
}
|
||||
|
||||
impl Mbox {
|
||||
pub fn new() -> Mbox {
|
||||
Mbox {
|
||||
buffer: [0; 10],
|
||||
registers: VIDEOCORE_MBOX as *const Registers,
|
||||
}
|
||||
}
|
||||
|
||||
/// Make a mailbox call. Returns Err(MboxError) on failure, Ok(()) success
|
||||
pub fn call(&mut self, channel: u32) -> Result<()> {
|
||||
// wait until we can write to the mailbox
|
||||
loop {
|
||||
unsafe {
|
||||
if ((*self.registers).STATUS.read() & FULL) != FULL {
|
||||
break;
|
||||
}
|
||||
asm!("nop" :::: "volatile");
|
||||
}
|
||||
}
|
||||
|
||||
// write the address of our message to the mailbox with channel identifier
|
||||
unsafe {
|
||||
(*self.registers)
|
||||
.WRITE
|
||||
.write(((self.buffer.as_mut_ptr() as u32) & !0xF) | (channel & 0xF));
|
||||
}
|
||||
|
||||
// now wait for the response
|
||||
loop {
|
||||
// is there a response?
|
||||
loop {
|
||||
unsafe {
|
||||
if ((*self.registers).STATUS.read() & EMPTY) != EMPTY {
|
||||
break;
|
||||
}
|
||||
asm!("nop" :::: "volatile");
|
||||
}
|
||||
}
|
||||
|
||||
let resp: u32 = unsafe { (*self.registers).READ.read() };
|
||||
|
||||
// is it a response to our message?
|
||||
if ((resp & 0xF) == channel) && ((resp & !0xF) == (self.buffer.as_mut_ptr() as u32)) {
|
||||
// is it a valid successful response?
|
||||
return match self.buffer[1] {
|
||||
response::SUCCESS => Ok(()),
|
||||
response::ERROR => Err(MboxError::ResponseError),
|
||||
_ => Err(MboxError::UnknownError),
|
||||
};
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,153 @@
|
||||
/*
|
||||
* MIT License
|
||||
*
|
||||
* Copyright (c) 2018 Andre Richter <andre.o.richter@gmail.com>
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in all
|
||||
* copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE.
|
||||
*/
|
||||
|
||||
use super::MMIO_BASE;
|
||||
use core::sync::atomic::{compiler_fence, Ordering};
|
||||
use gpio;
|
||||
use mbox;
|
||||
use volatile_register::*;
|
||||
|
||||
const UART_BASE: u32 = MMIO_BASE + 0x20_1000;
|
||||
|
||||
// PL011 UART registers
|
||||
#[allow(non_snake_case)]
|
||||
#[repr(C)]
|
||||
struct Registers {
|
||||
DR: RW<u32>, // 0x00
|
||||
__reserved_0: [u32; 5], // 0x04
|
||||
FR: RO<u32>, // 0x18
|
||||
__reserved_1: [u32; 2], // 0x1c
|
||||
IBRD: WO<u32>, // 0x24
|
||||
FBRD: WO<u32>, // 0x28
|
||||
LCRH: WO<u32>, // 0x2C
|
||||
CR: WO<u32>, // 0x30
|
||||
__reserved_2: [u32; 4], // 0x34
|
||||
ICR: WO<u32>, // 0x44
|
||||
}
|
||||
|
||||
pub enum UartError {
|
||||
MailboxError,
|
||||
}
|
||||
pub type Result<T> = ::core::result::Result<T, UartError>;
|
||||
|
||||
pub struct Uart {
|
||||
registers: *const Registers,
|
||||
}
|
||||
|
||||
impl Uart {
|
||||
pub fn new() -> Uart {
|
||||
Uart {
|
||||
registers: UART_BASE as *const Registers,
|
||||
}
|
||||
}
|
||||
|
||||
///Set baud rate and characteristics (115200 8N1) and map to GPIO
|
||||
pub fn init(&self, mbox: &mut mbox::Mbox) -> Result<()> {
|
||||
// turn off UART0
|
||||
unsafe { (*self.registers).CR.write(0) };
|
||||
|
||||
// set up clock for consistent divisor values
|
||||
mbox.buffer[0] = 9 * 4;
|
||||
mbox.buffer[1] = mbox::REQUEST;
|
||||
mbox.buffer[2] = mbox::tag::SETCLKRATE;
|
||||
mbox.buffer[3] = 12;
|
||||
mbox.buffer[4] = 8;
|
||||
mbox.buffer[5] = mbox::clock::UART; // UART clock
|
||||
mbox.buffer[6] = 4_000_000; // 4Mhz
|
||||
mbox.buffer[7] = 0; // skip turbo setting
|
||||
mbox.buffer[8] = mbox::tag::LAST;
|
||||
|
||||
// Insert a compiler fence that ensures that all stores to the
|
||||
// mbox buffer are finished before the GPU is signaled (which
|
||||
// is done by a store operation as well).
|
||||
compiler_fence(Ordering::Release);
|
||||
|
||||
if mbox.call(mbox::channel::PROP).is_err() {
|
||||
return Err(UartError::MailboxError); // Abort if UART clocks couldn't be set
|
||||
};
|
||||
|
||||
// map UART0 to GPIO pins
|
||||
unsafe {
|
||||
(*gpio::GPFSEL1).modify(|x| {
|
||||
// Modify with a closure
|
||||
let mut ret = x;
|
||||
ret &= !((7 << 12) | (7 << 15)); // gpio14, gpio15
|
||||
ret |= (4 << 12) | (4 << 15); // alt0
|
||||
|
||||
ret
|
||||
});
|
||||
|
||||
(*gpio::GPPUD).write(0); // enable pins 14 and 15
|
||||
for _ in 0..150 {
|
||||
asm!("nop" :::: "volatile");
|
||||
}
|
||||
|
||||
(*gpio::GPPUDCLK0).write((1 << 14) | (1 << 15));
|
||||
for _ in 0..150 {
|
||||
asm!("nop" :::: "volatile");
|
||||
}
|
||||
(*gpio::GPPUDCLK0).write(0);
|
||||
|
||||
(*self.registers).ICR.write(0x7FF); // clear interrupts
|
||||
(*self.registers).IBRD.write(2); // 115200 baud
|
||||
(*self.registers).FBRD.write(0xB);
|
||||
(*self.registers).LCRH.write(0b11 << 5); // 8n1
|
||||
(*self.registers).CR.write(0x301); // enable Tx, Rx, FIFO
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
/// Send a character
|
||||
pub fn send(&self, c: char) {
|
||||
unsafe {
|
||||
// wait until we can send
|
||||
loop {
|
||||
if ((*self.registers).FR.read() & 0x20) != 0x20 {
|
||||
break;
|
||||
}
|
||||
asm!("nop" :::: "volatile");
|
||||
}
|
||||
|
||||
// write the character to the buffer
|
||||
(*self.registers).DR.write(c as u32);
|
||||
}
|
||||
}
|
||||
|
||||
/// Receive a character
|
||||
pub fn getc(&self) -> u8 {
|
||||
unsafe {
|
||||
// wait until something is in the buffer
|
||||
loop {
|
||||
if ((*self.registers).FR.read() & 0x10) != 0x10 {
|
||||
break;
|
||||
}
|
||||
asm!("nop" :::: "volatile");
|
||||
}
|
||||
|
||||
// read it and return
|
||||
(*self.registers).DR.read() as u8
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,28 @@
|
||||
[[package]]
|
||||
name = "kernel8"
|
||||
version = "0.1.0"
|
||||
dependencies = [
|
||||
"raspi3_glue 0.1.0",
|
||||
"volatile-register 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "raspi3_glue"
|
||||
version = "0.1.0"
|
||||
|
||||
[[package]]
|
||||
name = "vcell"
|
||||
version = "0.1.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
|
||||
[[package]]
|
||||
name = "volatile-register"
|
||||
version = "0.2.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
dependencies = [
|
||||
"vcell 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
|
||||
]
|
||||
|
||||
[metadata]
|
||||
"checksum vcell 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "45c297f0afb6928cd08ab1ff9d95e99392595ea25ae1b5ecf822ff8764e57a0d"
|
||||
"checksum volatile-register 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "0d67cb4616d99b940db1d6bd28844ff97108b498a6ca850e5b6191a532063286"
|
||||
@ -0,0 +1,8 @@
|
||||
[package]
|
||||
name = "kernel8"
|
||||
version = "0.1.0"
|
||||
authors = ["Andre Richter <andre.o.richter@gmail.com>"]
|
||||
|
||||
[dependencies]
|
||||
raspi3_glue = { path = "raspi3_glue" }
|
||||
volatile-register = "0.2.0"
|
||||
@ -0,0 +1,72 @@
|
||||
#
|
||||
# MIT License
|
||||
#
|
||||
# Copyright (c) 2018 Andre Richter <andre.o.richter@gmail.com>
|
||||
#
|
||||
# Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
# of this software and associated documentation files (the "Software"), to deal
|
||||
# in the Software without restriction, including without limitation the rights
|
||||
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
# copies of the Software, and to permit persons to whom the Software is
|
||||
# furnished to do so, subject to the following conditions:
|
||||
#
|
||||
# The above copyright notice and this permission notice shall be included in all
|
||||
# copies or substantial portions of the Software.
|
||||
#
|
||||
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
# SOFTWARE.
|
||||
#
|
||||
|
||||
TARGET = aarch64-raspi3-none-elf
|
||||
|
||||
CROSS_CONTAINER = ./dockcross-linux-aarch64
|
||||
CROSS_CONTAINER_OBJCOPY = aarch64-linux-gnu-objcopy
|
||||
|
||||
UTILS_CONTAINER = andrerichter/raspi3-utils
|
||||
DOCKER_CMD = docker run -it --rm -v $(shell pwd):/work -w /work
|
||||
DOCKER_TTY = --privileged -v /dev:/dev
|
||||
QEMU_CMD = qemu-system-aarch64 -M raspi3 -kernel kernel8.img
|
||||
RASPBOOT_CMD = raspbootcom /dev/ttyUSB0 kernel8.img
|
||||
|
||||
all: clean cross_cont_download kernel8.img
|
||||
|
||||
cross_cont_download:
|
||||
ifeq (,$(wildcard $(CROSS_CONTAINER)))
|
||||
docker run --rm dockcross/linux-arm64 > $(CROSS_CONTAINER)
|
||||
chmod +x $(CROSS_CONTAINER)
|
||||
endif
|
||||
|
||||
target/$(TARGET)/debug/kernel8: src/main.rs
|
||||
RUST_TARGET_PATH=$(shell pwd) xargo build --target=$(TARGET)
|
||||
cp $@ .
|
||||
|
||||
target/$(TARGET)/release/kernel8: src/main.rs
|
||||
RUST_TARGET_PATH=$(shell pwd) xargo build --target=$(TARGET) --release
|
||||
cp $@ .
|
||||
|
||||
ifeq ($(DEBUG),1)
|
||||
kernel8: target/$(TARGET)/debug/kernel8
|
||||
else
|
||||
kernel8: target/$(TARGET)/release/kernel8
|
||||
endif
|
||||
|
||||
kernel8.img: kernel8
|
||||
$(CROSS_CONTAINER) $(CROSS_CONTAINER_OBJCOPY) -O binary -S $< kernel8.img
|
||||
|
||||
qemu:
|
||||
$(DOCKER_CMD) $(UTILS_CONTAINER) $(QEMU_CMD) -serial stdio
|
||||
|
||||
raspboot:
|
||||
$(DOCKER_CMD) $(DOCKER_TTY) $(UTILS_CONTAINER) $(RASPBOOT_CMD)
|
||||
|
||||
clippy:
|
||||
RUSTFLAGS="-C panic=abort" xargo clippy --target=$(TARGET)
|
||||
|
||||
clean:
|
||||
cargo clean
|
||||
rm -f kernel8
|
||||
@ -1,4 +1,4 @@
|
||||
# Tutorial 06 - Hardware Random Number Generator
|
||||
# Tutorial 07 - Hardware Random Number Generator
|
||||
|
||||
This going to be an easy tutorial. We query a number from the (undocumented)
|
||||
hardware random number generator. You can use this to implement a simple, but
|
||||
@ -0,0 +1,6 @@
|
||||
[dependencies.core]
|
||||
stage = 0
|
||||
|
||||
[dependencies.compiler_builtins]
|
||||
features = ["mem"] # for memset() et al.
|
||||
stage = 1
|
||||
@ -0,0 +1,24 @@
|
||||
{
|
||||
"arch": "aarch64",
|
||||
"data-layout": "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128",
|
||||
"executables": true,
|
||||
"linker-flavor": "ld.lld",
|
||||
"linker-is-gnu": true,
|
||||
"pre-link-args": {
|
||||
"ld.lld": [
|
||||
"--script=link.ld"
|
||||
]
|
||||
},
|
||||
"llvm-target": "aarch64-unknown-none",
|
||||
"no-compiler-rt": true,
|
||||
"features": "+a53,+strict-align",
|
||||
"max-atomic-width": 128,
|
||||
"os": "none",
|
||||
"panic": "abort",
|
||||
"panic-strategy": "abort",
|
||||
"relocation-model": "pic",
|
||||
"target-c-int-width": "32",
|
||||
"target-endian": "little",
|
||||
"target-pointer-width": "64",
|
||||
"disable-redzone": true
|
||||
}
|
||||
@ -0,0 +1,6 @@
|
||||
[package]
|
||||
name = "raspi3_glue"
|
||||
version = "0.1.0"
|
||||
authors = ["Andre Richter <andre.o.richter@gmail.com>"]
|
||||
|
||||
[dependencies]
|
||||
@ -0,0 +1,30 @@
|
||||
/*
|
||||
* MIT License
|
||||
*
|
||||
* Copyright (c) 2018 Andre Richter <andre.o.richter@gmail.com>
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
* of this software and associated documentation files (the "Software"), to deal
|
||||
* in the Software without restriction, including without limitation the rights
|
||||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
* copies of the Software, and to permit persons to whom the Software is
|
||||
* furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be included in all
|
||||
* copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
* SOFTWARE.
|
||||
*/
|
||||
|
||||
use volatile_register::RW;
|
||||
use super::MMIO_BASE;
|
||||
|
||||
pub const GPFSEL1: *const RW<u32> = (MMIO_BASE + 0x0020_0004) as *const RW<u32>;
|
||||
pub const GPPUD: *const RW<u32> = (MMIO_BASE + 0x0020_0094) as *const RW<u32>;
|
||||
pub const GPPUDCLK0: *const RW<u32> = (MMIO_BASE + 0x0020_0098) as *const RW<u32>;
|
||||
Loading…
Reference in New Issue