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@ -276,6 +276,13 @@ unsafe fn init(&self) -> Result<(), &'static str> {
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There's a couple of changes not covered in this tutorial text, but the reader should ideally skim
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There's a couple of changes not covered in this tutorial text, but the reader should ideally skim
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through them:
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through them:
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- [`src/bsp/raspberrypi/memory.rs`](src/bsp/raspberrypi/memory.rs) and
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[`src/bsp/raspberrypi/link.ld`](src/bsp/raspberrypi/link.ld) changed the location of the boot
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core's stack. It is now located after the data segment, and separated by an unmapped `guard page`.
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There is also supporting code in
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[`src/_arch/aarch64/exception.rs`](src/_arch/aarch64/exception.rs) that runs on data aborts and
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checks if the fault address lies within the `stack guard page`. This can be an indication that a
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kernel stack overflow happened.
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- [`src/memory/mmu/types.rs`](src/memory/mmu/types.rs) introduces a couple of supporting types, like
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- [`src/memory/mmu/types.rs`](src/memory/mmu/types.rs) introduces a couple of supporting types, like
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`Page<ATYPE>`.
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`Page<ATYPE>`.
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- [`src/memory/mmu/mapping_record.rs`](src/memory/mmu/mapping_record.rs) provides the generic kernel
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- [`src/memory/mmu/mapping_record.rs`](src/memory/mmu/mapping_record.rs) provides the generic kernel
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@ -309,18 +316,18 @@ Minipush 1.0
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[MP] ⏩ Pushing 67 KiB =========================================🦀 100% 0 KiB/s Time: 00:00:00
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[MP] ⏩ Pushing 67 KiB =========================================🦀 100% 0 KiB/s Time: 00:00:00
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[ML] Loaded! Executing the payload now
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[ML] Loaded! Executing the payload now
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[ 0.786819] Booting on: Raspberry Pi 3
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[ 0.789721] Booting on: Raspberry Pi 3
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[ 0.787092] MMU online:
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[ 0.789994] MMU online:
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[ 0.787384] -------------------------------------------------------------------------------------------------------------------------------------------
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[ 0.790286] -------------------------------------------------------------------------------------------------------------------------------------------
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[ 0.789128] Virtual Physical Size Attr Entity
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[ 0.792030] Virtual Physical Size Attr Entity
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[ 0.790873] -------------------------------------------------------------------------------------------------------------------------------------------
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[ 0.793774] -------------------------------------------------------------------------------------------------------------------------------------------
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[ 0.792618] 0x0000_0000_0007_0000..0x0000_0000_0007_ffff --> 0x00_0007_0000..0x00_0007_ffff | 64 KiB | C RW XN | Kernel boot-core stack
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[ 0.795520] 0x0000_0000_0008_0000..0x0000_0000_0008_ffff --> 0x00_0008_0000..0x00_0008_ffff | 64 KiB | C RO X | Kernel code and RO data
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[ 0.794221] 0x0000_0000_0008_0000..0x0000_0000_0008_ffff --> 0x00_0008_0000..0x00_0008_ffff | 64 KiB | C RO X | Kernel code and RO data
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[ 0.797134] 0x0000_0000_0009_0000..0x0000_0000_001b_ffff --> 0x00_0009_0000..0x00_001b_ffff | 1 MiB | C RW XN | Kernel data and bss
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[ 0.795835] 0x0000_0000_0009_0000..0x0000_0000_001b_ffff --> 0x00_0009_0000..0x00_001b_ffff | 1 MiB | C RW XN | Kernel data and bss
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[ 0.798704] 0x0000_0000_001d_0000..0x0000_0000_0024_ffff --> 0x00_001d_0000..0x00_0024_ffff | 512 KiB | C RW XN | Kernel boot-core stack
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[ 0.797406] 0x0000_0001_f000_0000..0x0000_0001_f000_ffff --> 0x00_3f20_0000..0x00_3f20_ffff | 64 KiB | Dev RW XN | BCM GPIO
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[ 0.800307] 0x0000_0001_f000_0000..0x0000_0001_f000_ffff --> 0x00_3f20_0000..0x00_3f20_ffff | 64 KiB | Dev RW XN | BCM GPIO
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[ 0.798857] | BCM PL011 UART
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[ 0.801759] | BCM PL011 UART
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[ 0.800374] 0x0000_0001_f001_0000..0x0000_0001_f001_ffff --> 0x00_3f00_0000..0x00_3f00_ffff | 64 KiB | Dev RW XN | BCM Peripheral Interrupt Controller
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[ 0.803276] 0x0000_0001_f001_0000..0x0000_0001_f001_ffff --> 0x00_3f00_0000..0x00_3f00_ffff | 64 KiB | Dev RW XN | BCM Peripheral Interrupt Controller
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[ 0.802117] -------------------------------------------------------------------------------------------------------------------------------------------
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[ 0.805020] -------------------------------------------------------------------------------------------------------------------------------------------
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```
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```
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Raspberry Pi 4:
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Raspberry Pi 4:
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@ -344,19 +351,19 @@ Minipush 1.0
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[MP] ⏩ Pushing 74 KiB =========================================🦀 100% 0 KiB/s Time: 00:00:00
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[MP] ⏩ Pushing 74 KiB =========================================🦀 100% 0 KiB/s Time: 00:00:00
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[ML] Loaded! Executing the payload now
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[ML] Loaded! Executing the payload now
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[ 0.853908] Booting on: Raspberry Pi 4
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[ 0.870371] Booting on: Raspberry Pi 4
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[ 0.854007] MMU online:
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[ 0.870470] MMU online:
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[ 0.854299] -------------------------------------------------------------------------------------------------------------------------------------------
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[ 0.870763] -------------------------------------------------------------------------------------------------------------------------------------------
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[ 0.856043] Virtual Physical Size Attr Entity
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[ 0.872507] Virtual Physical Size Attr Entity
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[ 0.857788] -------------------------------------------------------------------------------------------------------------------------------------------
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[ 0.874251] -------------------------------------------------------------------------------------------------------------------------------------------
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[ 0.859533] 0x0000_0000_0007_0000..0x0000_0000_0007_ffff --> 0x00_0007_0000..0x00_0007_ffff | 64 KiB | C RW XN | Kernel boot-core stack
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[ 0.875996] 0x0000_0000_0008_0000..0x0000_0000_0008_ffff --> 0x00_0008_0000..0x00_0008_ffff | 64 KiB | C RO X | Kernel code and RO data
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[ 0.861137] 0x0000_0000_0008_0000..0x0000_0000_0008_ffff --> 0x00_0008_0000..0x00_0008_ffff | 64 KiB | C RO X | Kernel code and RO data
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[ 0.877611] 0x0000_0000_0009_0000..0x0000_0000_001b_ffff --> 0x00_0009_0000..0x00_001b_ffff | 1 MiB | C RW XN | Kernel data and bss
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[ 0.862750] 0x0000_0000_0009_0000..0x0000_0000_001b_ffff --> 0x00_0009_0000..0x00_001b_ffff | 1 MiB | C RW XN | Kernel data and bss
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[ 0.879181] 0x0000_0000_001d_0000..0x0000_0000_0024_ffff --> 0x00_001d_0000..0x00_0024_ffff | 512 KiB | C RW XN | Kernel boot-core stack
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[ 0.864321] 0x0000_0001_f000_0000..0x0000_0001_f000_ffff --> 0x00_fe20_0000..0x00_fe20_ffff | 64 KiB | Dev RW XN | BCM GPIO
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[ 0.880784] 0x0000_0001_f000_0000..0x0000_0001_f000_ffff --> 0x00_fe20_0000..0x00_fe20_ffff | 64 KiB | Dev RW XN | BCM GPIO
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[ 0.865772] | BCM PL011 UART
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[ 0.882235] | BCM PL011 UART
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[ 0.867289] 0x0000_0001_f001_0000..0x0000_0001_f001_ffff --> 0x00_ff84_0000..0x00_ff84_ffff | 64 KiB | Dev RW XN | GICD
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[ 0.883752] 0x0000_0001_f001_0000..0x0000_0001_f001_ffff --> 0x00_ff84_0000..0x00_ff84_ffff | 64 KiB | Dev RW XN | GICD
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[ 0.868697] | GICC
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[ 0.885160] | GICC
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[ 0.870105] -------------------------------------------------------------------------------------------------------------------------------------------
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[ 0.886569] -------------------------------------------------------------------------------------------------------------------------------------------
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```
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```
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## Diff to previous
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## Diff to previous
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@ -375,6 +382,55 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/_arch/aarch64/cpu/boot.rs 15_v
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// Use `eret` to "return" to EL1. This results in execution of runtime_init() in EL1.
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// Use `eret` to "return" to EL1. This results in execution of runtime_init() in EL1.
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asm::eret()
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asm::eret()
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diff -uNr 14_exceptions_part2_peripheral_IRQs/src/_arch/aarch64/exception.rs 15_virtual_mem_part2_mmio_remap/src/_arch/aarch64/exception.rs
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--- 14_exceptions_part2_peripheral_IRQs/src/_arch/aarch64/exception.rs
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+++ 15_virtual_mem_part2_mmio_remap/src/_arch/aarch64/exception.rs
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@@ -11,7 +11,11 @@
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//!
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//! crate::exception::arch_exception
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-use crate::{bsp, exception};
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+use crate::{
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+ bsp::{self},
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+ exception,
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+ memory::Address,
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+};
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use core::{cell::UnsafeCell, fmt};
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use cortex_a::{barrier, regs::*};
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use register::InMemoryRegister;
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@@ -50,6 +54,20 @@
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// Private Code
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//--------------------------------------------------------------------------------------------------
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+/// Check if additional context can be derived from a data abort.
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+fn inspect_data_abort(f: &mut fmt::Formatter) -> fmt::Result {
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+ let fault_addr = Address::new(FAR_EL1.get() as usize);
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+
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+ if bsp::memory::mmu::virt_boot_core_stack_guard_page_desc().contains(fault_addr) {
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+ writeln!(
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+ f,
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+ "\n\n >> Attempted to access the guard page of the kernel's boot core stack <<"
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+ )?;
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+ }
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+
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+ Ok(())
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+}
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+
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/// Prints verbose information about the exception and then panics.
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fn default_exception_handler(e: &ExceptionContext) {
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panic!(
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@@ -166,7 +184,9 @@
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writeln!(f, " - {}", ec_translation)?;
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// Raw print of instruction specific syndrome.
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- write!(f, " Instr Specific Syndrome (ISS): {:#x}", esr_el1.read(ESR_EL1::ISS))
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+ write!(f, " Instr Specific Syndrome (ISS): {:#x}", esr_el1.read(ESR_EL1::ISS))?;
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+
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+ inspect_data_abort(f)
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}
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}
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diff -uNr 14_exceptions_part2_peripheral_IRQs/src/_arch/aarch64/memory/mmu/translation_table.rs 15_virtual_mem_part2_mmio_remap/src/_arch/aarch64/memory/mmu/translation_table.rs
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diff -uNr 14_exceptions_part2_peripheral_IRQs/src/_arch/aarch64/memory/mmu/translation_table.rs 15_virtual_mem_part2_mmio_remap/src/_arch/aarch64/memory/mmu/translation_table.rs
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--- 14_exceptions_part2_peripheral_IRQs/src/_arch/aarch64/memory/mmu/translation_table.rs
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--- 14_exceptions_part2_peripheral_IRQs/src/_arch/aarch64/memory/mmu/translation_table.rs
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+++ 15_virtual_mem_part2_mmio_remap/src/_arch/aarch64/memory/mmu/translation_table.rs
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+++ 15_virtual_mem_part2_mmio_remap/src/_arch/aarch64/memory/mmu/translation_table.rs
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@ -1413,23 +1469,41 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/driver.rs 15_v
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diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/link.ld 15_virtual_mem_part2_mmio_remap/src/bsp/raspberrypi/link.ld
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diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/link.ld 15_virtual_mem_part2_mmio_remap/src/bsp/raspberrypi/link.ld
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--- 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/link.ld
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--- 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/link.ld
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+++ 15_virtual_mem_part2_mmio_remap/src/bsp/raspberrypi/link.ld
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+++ 15_virtual_mem_part2_mmio_remap/src/bsp/raspberrypi/link.ld
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@@ -42,6 +42,11 @@
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@@ -37,6 +37,7 @@
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. += 8;
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/***********************************************************************************************
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* Data + BSS
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***********************************************************************************************/
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+ __rw_start = .;
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.data : { *(.data*) } :segment_rw
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/* Section is zeroed in u64 chunks, align start and end to 8 bytes */
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@@ -49,4 +50,21 @@
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. += 8; /* Fill for the bss == 0 case, so that __bss_start <= __bss_end_inclusive holds */
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__bss_end_inclusive = . - 8;
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__bss_end_inclusive = . - 8;
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}
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} :NONE
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+ . = ALIGN(65536);
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+
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+ __data_end = .;
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+ . = ALIGN(64K); /* Align to page boundary */
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+
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+ __rw_end_exclusive = .;
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+ __ro_size = __ro_end - __ro_start;
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+
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+ __data_size = __data_end - __ro_end;
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+ /***********************************************************************************************
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+ * Guard Page between boot core stack and data
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/DISCARD/ : { *(.comment*) }
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+ ***********************************************************************************************/
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+ __boot_core_stack_guard_page_start = .;
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+ . += 64K;
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+ __boot_core_stack_guard_page_end_exclusive = .;
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+
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+ /***********************************************************************************************
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+ * Boot Core Stack
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+ ***********************************************************************************************/
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+ __boot_core_stack_start = .;
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|
+ . += 512K;
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|
|
+ __boot_core_stack_end_exclusive = .;
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|
}
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|
|
}
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|
|
|
|
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|
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|
diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory/mmu.rs 15_virtual_mem_part2_mmio_remap/src/bsp/raspberrypi/memory/mmu.rs
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diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory/mmu.rs 15_virtual_mem_part2_mmio_remap/src/bsp/raspberrypi/memory/mmu.rs
|
|
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|
--- 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory/mmu.rs
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--- 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory/mmu.rs
|
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+++ 15_virtual_mem_part2_mmio_remap/src/bsp/raspberrypi/memory/mmu.rs
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|
+++ 15_virtual_mem_part2_mmio_remap/src/bsp/raspberrypi/memory/mmu.rs
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|
@@ -4,70 +4,157 @@
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|
@@ -4,70 +4,164 @@
|
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|
//! BSP Memory Management Unit.
|
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|
|
//! BSP Memory Management Unit.
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@ -1465,16 +1539,16 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory/mmu.rs
|
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|
+/// The translation granule chosen by this BSP. This will be used everywhere else in the kernel to
|
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|
|
+/// The translation granule chosen by this BSP. This will be used everywhere else in the kernel to
|
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|
|
+/// derive respective data structures and their sizes. For example, the `crate::memory::mmu::Page`.
|
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|
|
+/// derive respective data structures and their sizes. For example, the `crate::memory::mmu::Page`.
|
|
|
|
+pub type KernelGranule = TranslationGranule<{ 64 * 1024 }>;
|
|
|
|
+pub type KernelGranule = TranslationGranule<{ 64 * 1024 }>;
|
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+
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|
|
-const NUM_MEM_RANGES: usize = 2;
|
|
|
|
|
|
|
|
+/// The kernel's virtual address space defined by this BSP.
|
|
|
|
+/// The kernel's virtual address space defined by this BSP.
|
|
|
|
+pub type KernelVirtAddrSpace = AddressSpace<{ 8 * 1024 * 1024 * 1024 }>;
|
|
|
|
+pub type KernelVirtAddrSpace = AddressSpace<{ 8 * 1024 * 1024 * 1024 }>;
|
|
|
|
|
|
|
|
|
|
|
|
-/// The virtual memory layout.
|
|
|
|
-const NUM_MEM_RANGES: usize = 2;
|
|
|
|
+//--------------------------------------------------------------------------------------------------
|
|
|
|
+//--------------------------------------------------------------------------------------------------
|
|
|
|
+// Global instances
|
|
|
|
+// Global instances
|
|
|
|
+//--------------------------------------------------------------------------------------------------
|
|
|
|
+//--------------------------------------------------------------------------------------------------
|
|
|
|
+
|
|
|
|
|
|
|
|
|
|
|
|
-/// The virtual memory layout.
|
|
|
|
+/// The kernel translation tables.
|
|
|
|
+/// The kernel translation tables.
|
|
|
|
///
|
|
|
|
///
|
|
|
|
-/// The layout must contain only special ranges, aka anything that is _not_ normal cacheable DRAM.
|
|
|
|
-/// The layout must contain only special ranges, aka anything that is _not_ normal cacheable DRAM.
|
|
|
|
@ -1484,7 +1558,7 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory/mmu.rs
|
|
|
|
- [
|
|
|
|
- [
|
|
|
|
- TranslationDescriptor {
|
|
|
|
- TranslationDescriptor {
|
|
|
|
- name: "Kernel code and RO data",
|
|
|
|
- name: "Kernel code and RO data",
|
|
|
|
- virtual_range: ro_range_inclusive,
|
|
|
|
- virtual_range: rx_range_inclusive,
|
|
|
|
- physical_range_translation: Translation::Identity,
|
|
|
|
- physical_range_translation: Translation::Identity,
|
|
|
|
- attribute_fields: AttributeFields {
|
|
|
|
- attribute_fields: AttributeFields {
|
|
|
|
- mem_attributes: MemAttributes::CacheableDRAM,
|
|
|
|
- mem_attributes: MemAttributes::CacheableDRAM,
|
|
|
|
@ -1515,10 +1589,10 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory/mmu.rs
|
|
|
|
// Private Code
|
|
|
|
// Private Code
|
|
|
|
//--------------------------------------------------------------------------------------------------
|
|
|
|
//--------------------------------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
|
|
|
-fn ro_range_inclusive() -> RangeInclusive<usize> {
|
|
|
|
-fn rx_range_inclusive() -> RangeInclusive<usize> {
|
|
|
|
- // Notice the subtraction to turn the exclusive end into an inclusive end.
|
|
|
|
- // Notice the subtraction to turn the exclusive end into an inclusive end.
|
|
|
|
- #[allow(clippy::range_minus_one)]
|
|
|
|
- #[allow(clippy::range_minus_one)]
|
|
|
|
- RangeInclusive::new(super::ro_start(), super::ro_end() - 1)
|
|
|
|
- RangeInclusive::new(super::rx_start(), super::rx_end_exclusive() - 1)
|
|
|
|
+/// Helper function for calculating the number of pages the given parameter spans.
|
|
|
|
+/// Helper function for calculating the number of pages the given parameter spans.
|
|
|
|
+const fn size_to_num_pages(size: usize) -> usize {
|
|
|
|
+const fn size_to_num_pages(size: usize) -> usize {
|
|
|
|
+ assert!(size > 0);
|
|
|
|
+ assert!(size > 0);
|
|
|
|
@ -1527,44 +1601,44 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory/mmu.rs
|
|
|
|
+ size >> KernelGranule::SHIFT
|
|
|
|
+ size >> KernelGranule::SHIFT
|
|
|
|
+}
|
|
|
|
+}
|
|
|
|
+
|
|
|
|
+
|
|
|
|
+/// The boot core's stack.
|
|
|
|
+/// The Read+Execute (RX) pages of the kernel binary.
|
|
|
|
+fn virt_stack_page_desc() -> PageSliceDescriptor<Virtual> {
|
|
|
|
+fn virt_rx_page_desc() -> PageSliceDescriptor<Virtual> {
|
|
|
|
+ let num_pages = size_to_num_pages(super::boot_core_stack_size());
|
|
|
|
+ let num_pages = size_to_num_pages(super::rx_size());
|
|
|
|
+
|
|
|
|
+
|
|
|
|
+ PageSliceDescriptor::from_addr(super::virt_boot_core_stack_start(), num_pages)
|
|
|
|
+ PageSliceDescriptor::from_addr(super::virt_rx_start(), num_pages)
|
|
|
|
+}
|
|
|
|
+}
|
|
|
|
+
|
|
|
|
+
|
|
|
|
+/// The Read-Only (RO) pages of the kernel binary.
|
|
|
|
+/// The Read+Write (RW) pages of the kernel binary.
|
|
|
|
+fn virt_ro_page_desc() -> PageSliceDescriptor<Virtual> {
|
|
|
|
+fn virt_rw_page_desc() -> PageSliceDescriptor<Virtual> {
|
|
|
|
+ let num_pages = size_to_num_pages(super::ro_size());
|
|
|
|
+ let num_pages = size_to_num_pages(super::rw_size());
|
|
|
|
+
|
|
|
|
+
|
|
|
|
+ PageSliceDescriptor::from_addr(super::virt_ro_start(), num_pages)
|
|
|
|
+ PageSliceDescriptor::from_addr(super::virt_rw_start(), num_pages)
|
|
|
|
+}
|
|
|
|
+}
|
|
|
|
+
|
|
|
|
+
|
|
|
|
+/// The data pages of the kernel binary.
|
|
|
|
+/// The boot core's stack.
|
|
|
|
+fn virt_data_page_desc() -> PageSliceDescriptor<Virtual> {
|
|
|
|
+fn virt_boot_core_stack_page_desc() -> PageSliceDescriptor<Virtual> {
|
|
|
|
+ let num_pages = size_to_num_pages(super::data_size());
|
|
|
|
+ let num_pages = size_to_num_pages(super::boot_core_stack_size());
|
|
|
|
+
|
|
|
|
+
|
|
|
|
+ PageSliceDescriptor::from_addr(super::virt_data_start(), num_pages)
|
|
|
|
+ PageSliceDescriptor::from_addr(super::virt_boot_core_stack_start(), num_pages)
|
|
|
|
+}
|
|
|
|
+}
|
|
|
|
+
|
|
|
|
+
|
|
|
|
+// The binary is still identity mapped, so we don't need to convert in the following.
|
|
|
|
+// The binary is still identity mapped, so we don't need to convert in the following.
|
|
|
|
+
|
|
|
|
+
|
|
|
|
+/// The boot core's stack.
|
|
|
|
+/// The Read+Execute (RX) pages of the kernel binary.
|
|
|
|
+fn phys_stack_page_desc() -> PageSliceDescriptor<Physical> {
|
|
|
|
+fn phys_rx_page_desc() -> PageSliceDescriptor<Physical> {
|
|
|
|
+ virt_stack_page_desc().into()
|
|
|
|
+ virt_rx_page_desc().into()
|
|
|
|
+}
|
|
|
|
|
|
|
|
+
|
|
|
|
|
|
|
|
+/// The Read-Only (RO) pages of the kernel binary.
|
|
|
|
|
|
|
|
+fn phys_ro_page_desc() -> PageSliceDescriptor<Physical> {
|
|
|
|
|
|
|
|
+ virt_ro_page_desc().into()
|
|
|
|
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
-fn mmio_range_inclusive() -> RangeInclusive<usize> {
|
|
|
|
-fn mmio_range_inclusive() -> RangeInclusive<usize> {
|
|
|
|
- RangeInclusive::new(memory_map::mmio::START, memory_map::mmio::END_INCLUSIVE)
|
|
|
|
- RangeInclusive::new(memory_map::mmio::START, memory_map::mmio::END_INCLUSIVE)
|
|
|
|
+/// The data pages of the kernel binary.
|
|
|
|
+/// The Read+Write (RW) pages of the kernel binary.
|
|
|
|
+fn phys_data_page_desc() -> PageSliceDescriptor<Physical> {
|
|
|
|
+fn phys_rw_page_desc() -> PageSliceDescriptor<Physical> {
|
|
|
|
+ virt_data_page_desc().into()
|
|
|
|
+ virt_rw_page_desc().into()
|
|
|
|
|
|
|
|
+}
|
|
|
|
|
|
|
|
+
|
|
|
|
|
|
|
|
+/// The boot core's stack.
|
|
|
|
|
|
|
|
+fn phys_boot_core_stack_page_desc() -> PageSliceDescriptor<Physical> {
|
|
|
|
|
|
|
|
+ virt_boot_core_stack_page_desc().into()
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
//--------------------------------------------------------------------------------------------------
|
|
|
|
//--------------------------------------------------------------------------------------------------
|
|
|
|
@ -1579,6 +1653,13 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory/mmu.rs
|
|
|
|
+ &KERNEL_TABLES
|
|
|
|
+ &KERNEL_TABLES
|
|
|
|
+}
|
|
|
|
+}
|
|
|
|
+
|
|
|
|
+
|
|
|
|
|
|
|
|
+/// The boot core's stack guard page.
|
|
|
|
|
|
|
|
+pub fn virt_boot_core_stack_guard_page_desc() -> PageSliceDescriptor<Virtual> {
|
|
|
|
|
|
|
|
+ let num_pages = size_to_num_pages(super::boot_core_stack_guard_page_size());
|
|
|
|
|
|
|
|
+
|
|
|
|
|
|
|
|
+ PageSliceDescriptor::from_addr(super::virt_boot_core_stack_guard_page_start(), num_pages)
|
|
|
|
|
|
|
|
+}
|
|
|
|
|
|
|
|
+
|
|
|
|
+/// Pointer to the last page of the physical address space.
|
|
|
|
+/// Pointer to the last page of the physical address space.
|
|
|
|
+pub fn phys_addr_space_end_page() -> *const Page<Physical> {
|
|
|
|
+pub fn phys_addr_space_end_page() -> *const Page<Physical> {
|
|
|
|
+ common::align_down(
|
|
|
|
+ common::align_down(
|
|
|
|
@ -1594,31 +1675,31 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory/mmu.rs
|
|
|
|
+/// - Any miscalculation or attribute error will likely be fatal. Needs careful manual checking.
|
|
|
|
+/// - Any miscalculation or attribute error will likely be fatal. Needs careful manual checking.
|
|
|
|
+pub unsafe fn kernel_map_binary() -> Result<(), &'static str> {
|
|
|
|
+pub unsafe fn kernel_map_binary() -> Result<(), &'static str> {
|
|
|
|
+ generic_mmu::kernel_map_pages_at(
|
|
|
|
+ generic_mmu::kernel_map_pages_at(
|
|
|
|
+ "Kernel boot-core stack",
|
|
|
|
+ "Kernel code and RO data",
|
|
|
|
+ &virt_stack_page_desc(),
|
|
|
|
+ &virt_rx_page_desc(),
|
|
|
|
+ &phys_stack_page_desc(),
|
|
|
|
+ &phys_rx_page_desc(),
|
|
|
|
+ &AttributeFields {
|
|
|
|
+ &AttributeFields {
|
|
|
|
+ mem_attributes: MemAttributes::CacheableDRAM,
|
|
|
|
+ mem_attributes: MemAttributes::CacheableDRAM,
|
|
|
|
+ acc_perms: AccessPermissions::ReadWrite,
|
|
|
|
+ acc_perms: AccessPermissions::ReadOnly,
|
|
|
|
+ execute_never: true,
|
|
|
|
+ execute_never: false,
|
|
|
|
+ },
|
|
|
|
+ },
|
|
|
|
+ )?;
|
|
|
|
+ )?;
|
|
|
|
+
|
|
|
|
+
|
|
|
|
+ generic_mmu::kernel_map_pages_at(
|
|
|
|
+ generic_mmu::kernel_map_pages_at(
|
|
|
|
+ "Kernel code and RO data",
|
|
|
|
+ "Kernel data and bss",
|
|
|
|
+ &virt_ro_page_desc(),
|
|
|
|
+ &virt_rw_page_desc(),
|
|
|
|
+ &phys_ro_page_desc(),
|
|
|
|
+ &phys_rw_page_desc(),
|
|
|
|
+ &AttributeFields {
|
|
|
|
+ &AttributeFields {
|
|
|
|
+ mem_attributes: MemAttributes::CacheableDRAM,
|
|
|
|
+ mem_attributes: MemAttributes::CacheableDRAM,
|
|
|
|
+ acc_perms: AccessPermissions::ReadOnly,
|
|
|
|
+ acc_perms: AccessPermissions::ReadWrite,
|
|
|
|
+ execute_never: false,
|
|
|
|
+ execute_never: true,
|
|
|
|
+ },
|
|
|
|
+ },
|
|
|
|
+ )?;
|
|
|
|
+ )?;
|
|
|
|
+
|
|
|
|
+
|
|
|
|
+ generic_mmu::kernel_map_pages_at(
|
|
|
|
+ generic_mmu::kernel_map_pages_at(
|
|
|
|
+ "Kernel data and bss",
|
|
|
|
+ "Kernel boot-core stack",
|
|
|
|
+ &virt_data_page_desc(),
|
|
|
|
+ &virt_boot_core_stack_page_desc(),
|
|
|
|
+ &phys_data_page_desc(),
|
|
|
|
+ &phys_boot_core_stack_page_desc(),
|
|
|
|
+ &AttributeFields {
|
|
|
|
+ &AttributeFields {
|
|
|
|
+ mem_attributes: MemAttributes::CacheableDRAM,
|
|
|
|
+ mem_attributes: MemAttributes::CacheableDRAM,
|
|
|
|
+ acc_perms: AccessPermissions::ReadWrite,
|
|
|
|
+ acc_perms: AccessPermissions::ReadWrite,
|
|
|
|
@ -1630,7 +1711,7 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory/mmu.rs
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
//--------------------------------------------------------------------------------------------------
|
|
|
|
//--------------------------------------------------------------------------------------------------
|
|
|
|
@@ -82,14 +169,12 @@
|
|
|
|
@@ -82,14 +176,18 @@
|
|
|
|
/// Check alignment of the kernel's virtual memory layout sections.
|
|
|
|
/// Check alignment of the kernel's virtual memory layout sections.
|
|
|
|
#[kernel_test]
|
|
|
|
#[kernel_test]
|
|
|
|
fn virt_mem_layout_sections_are_64KiB_aligned() {
|
|
|
|
fn virt_mem_layout_sections_are_64KiB_aligned() {
|
|
|
|
@ -1639,7 +1720,13 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory/mmu.rs
|
|
|
|
- for i in LAYOUT.inner().iter() {
|
|
|
|
- for i in LAYOUT.inner().iter() {
|
|
|
|
- let start: usize = *(i.virtual_range)().start();
|
|
|
|
- let start: usize = *(i.virtual_range)().start();
|
|
|
|
- let end: usize = *(i.virtual_range)().end() + 1;
|
|
|
|
- let end: usize = *(i.virtual_range)().end() + 1;
|
|
|
|
+ for i in [virt_stack_page_desc, virt_ro_page_desc, virt_data_page_desc].iter() {
|
|
|
|
+ for i in [
|
|
|
|
|
|
|
|
+ virt_rx_page_desc,
|
|
|
|
|
|
|
|
+ virt_rw_page_desc,
|
|
|
|
|
|
|
|
+ virt_boot_core_stack_page_desc,
|
|
|
|
|
|
|
|
+ ]
|
|
|
|
|
|
|
|
+ .iter()
|
|
|
|
|
|
|
|
+ {
|
|
|
|
+ let start: usize = i().start_addr().into_usize();
|
|
|
|
+ let start: usize = i().start_addr().into_usize();
|
|
|
|
+ let end: usize = i().end_addr().into_usize();
|
|
|
|
+ let end: usize = i().end_addr().into_usize();
|
|
|
|
|
|
|
|
|
|
|
|
@ -1650,7 +1737,7 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory/mmu.rs
|
|
|
|
assert!(end >= start);
|
|
|
|
assert!(end >= start);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
@@ -97,18 +182,28 @@
|
|
|
|
@@ -97,18 +195,28 @@
|
|
|
|
/// Ensure the kernel's virtual memory layout is free of overlaps.
|
|
|
|
/// Ensure the kernel's virtual memory layout is free of overlaps.
|
|
|
|
#[kernel_test]
|
|
|
|
#[kernel_test]
|
|
|
|
fn virt_mem_layout_has_no_overlaps() {
|
|
|
|
fn virt_mem_layout_has_no_overlaps() {
|
|
|
|
@ -1666,9 +1753,9 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory/mmu.rs
|
|
|
|
- assert!(!second_range().contains(first_range().start()));
|
|
|
|
- assert!(!second_range().contains(first_range().start()));
|
|
|
|
- assert!(!second_range().contains(first_range().end()));
|
|
|
|
- assert!(!second_range().contains(first_range().end()));
|
|
|
|
+ let layout = [
|
|
|
|
+ let layout = [
|
|
|
|
+ virt_stack_page_desc(),
|
|
|
|
+ virt_rx_page_desc(),
|
|
|
|
+ virt_ro_page_desc(),
|
|
|
|
+ virt_rw_page_desc(),
|
|
|
|
+ virt_data_page_desc(),
|
|
|
|
+ virt_boot_core_stack_page_desc(),
|
|
|
|
+ ];
|
|
|
|
+ ];
|
|
|
|
+
|
|
|
|
+
|
|
|
|
+ for (i, first_range) in layout.iter().enumerate() {
|
|
|
|
+ for (i, first_range) in layout.iter().enumerate() {
|
|
|
|
@ -1694,7 +1781,7 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory/mmu.rs
|
|
|
|
diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory.rs 15_virtual_mem_part2_mmio_remap/src/bsp/raspberrypi/memory.rs
|
|
|
|
diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory.rs 15_virtual_mem_part2_mmio_remap/src/bsp/raspberrypi/memory.rs
|
|
|
|
--- 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory.rs
|
|
|
|
--- 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory.rs
|
|
|
|
+++ 15_virtual_mem_part2_mmio_remap/src/bsp/raspberrypi/memory.rs
|
|
|
|
+++ 15_virtual_mem_part2_mmio_remap/src/bsp/raspberrypi/memory.rs
|
|
|
|
@@ -3,9 +3,41 @@
|
|
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@@ -3,9 +3,40 @@
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// Copyright (c) 2018-2021 Andre Richter <andre.o.richter@gmail.com>
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// Copyright (c) 2018-2021 Andre Richter <andre.o.richter@gmail.com>
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//! BSP Memory Management.
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//! BSP Memory Management.
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@ -1703,31 +1790,30 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory.rs 15_v
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+//! copies the binary to 0x8_0000:
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+//! copies the binary to 0x8_0000:
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+//!
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+//!
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+//! +---------------------------------------------+
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+//! +---------------------------------------------+
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+//! | | 0x0
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+//! | Unmapped |
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+//! | | 0x6_FFFF
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+//! +---------------------------------------------+
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+//! | BOOT_CORE_STACK_START | 0x7_0000
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+//! | | ^
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+//! | ... | | Stack growth direction
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+//! | | |
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+//! | BOOT_CORE_STACK_END_INCLUSIVE | 0x7_FFFF
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+//! +---------------------------------------------+
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+//! | RO_START == BOOT_CORE_STACK_END | 0x8_0000
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+//! | |
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+//! | |
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+//! | Unmapped |
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+//! | |
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+//! | |
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+//! +---------------------------------------------+
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+//! | | rx_start @ 0x8_0000
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+//! | .text |
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+//! | .text |
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+//! | .exception_vectors |
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+//! | .rodata |
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+//! | .rodata |
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+//! | |
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+//! | .got |
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+//! | RO_END_INCLUSIVE | 0x8_0000 + __ro_size - 1
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+//! | | rx_end_inclusive
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+//! +---------------------------------------------+
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+//! +---------------------------------------------+
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+//! | RO_END == DATA_START | 0x8_0000 + __ro_size
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+//! | | rw_start == ro_end
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+//! | |
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+//! | .data |
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+//! | .data |
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+//! | .bss |
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+//! | .bss |
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+//! | | rw_end_inclusive
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+//! +---------------------------------------------+
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+//! | | rw_end
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+//! | Unmapped Boot-core Stack Guard Page |
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+//! | |
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+//! | |
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+//! | DATA_END_INCLUSIVE | 0x8_0000 + __ro_size + __data_size - 1
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+//! +---------------------------------------------+
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+//! | | boot_core_stack_start ^
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+//! | | | stack
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+//! | Boot-core Stack | | growth
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+//! | | | direction
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+//! | | boot_core_stack_end_inclusive |
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+//! +---------------------------------------------+
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+//! +---------------------------------------------+
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pub mod mmu;
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pub mod mmu;
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@ -1736,21 +1822,25 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory.rs 15_v
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use core::{cell::UnsafeCell, ops::RangeInclusive};
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use core::{cell::UnsafeCell, ops::RangeInclusive};
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//--------------------------------------------------------------------------------------------------
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//--------------------------------------------------------------------------------------------------
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@@ -17,47 +49,39 @@
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@@ -17,8 +48,16 @@
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static __rx_start: UnsafeCell<()>;
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static __rx_end_exclusive: UnsafeCell<()>;
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+ static __rw_start: UnsafeCell<()>;
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static __bss_start: UnsafeCell<u64>;
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static __bss_start: UnsafeCell<u64>;
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static __bss_end_inclusive: UnsafeCell<u64>;
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static __bss_end_inclusive: UnsafeCell<u64>;
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static __ro_start: UnsafeCell<()>;
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+ static __rw_end_exclusive: UnsafeCell<()>;
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- static __ro_end: UnsafeCell<()>;
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+
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+ static __ro_size: UnsafeCell<()>;
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+ static __boot_core_stack_start: UnsafeCell<()>;
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+ static __data_size: UnsafeCell<()>;
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+ static __boot_core_stack_end_exclusive: UnsafeCell<()>;
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+
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+ static __boot_core_stack_guard_page_start: UnsafeCell<()>;
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+ static __boot_core_stack_guard_page_end_exclusive: UnsafeCell<()>;
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}
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}
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//--------------------------------------------------------------------------------------------------
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//--------------------------------------------------------------------------------------------------
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// Public Definitions
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@@ -28,35 +67,26 @@
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//--------------------------------------------------------------------------------------------------
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/// The board's physical memory map.
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-/// The board's memory map.
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+/// The board's physical memory map.
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#[rustfmt::skip]
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#[rustfmt::skip]
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pub(super) mod map {
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pub(super) mod map {
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- /// The inclusive end address of the memory map.
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- /// The inclusive end address of the memory map.
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@ -1767,13 +1857,10 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory.rs 15_v
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- /// physical address that is not backed by any DRAM (e.g. accessing an address close to 4 GiB on
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- /// physical address that is not backed by any DRAM (e.g. accessing an address close to 4 GiB on
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- /// an RPi3 that comes with 1 GiB of RAM). This would result in a crash or other kind of error.
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- /// an RPi3 that comes with 1 GiB of RAM). This would result in a crash or other kind of error.
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- pub const END_INCLUSIVE: usize = 0xFFFF_FFFF;
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- pub const END_INCLUSIVE: usize = 0xFFFF_FFFF;
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+ use super::*;
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- pub const BOOT_CORE_STACK_END: usize = 0x8_0000;
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-
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-
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- pub const GPIO_OFFSET: usize = 0x0020_0000;
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- pub const GPIO_OFFSET: usize = 0x0020_0000;
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- pub const UART_OFFSET: usize = 0x0020_1000;
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- pub const UART_OFFSET: usize = 0x0020_1000;
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+ pub const BOOT_CORE_STACK_SIZE: usize = 0x1_0000;
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+ use super::*;
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/// Physical devices.
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/// Physical devices.
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#[cfg(feature = "bsp_rpi3")]
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#[cfg(feature = "bsp_rpi3")]
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@ -1802,7 +1889,7 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory.rs 15_v
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}
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}
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/// Physical devices.
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/// Physical devices.
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@@ -65,13 +89,22 @@
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@@ -64,13 +94,22 @@
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pub mod mmio {
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pub mod mmio {
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use super::*;
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use super::*;
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@ -1831,53 +1918,72 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory.rs 15_v
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}
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}
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//--------------------------------------------------------------------------------------------------
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//--------------------------------------------------------------------------------------------------
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@@ -84,8 +117,8 @@
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@@ -83,18 +122,69 @@
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///
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///
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/// - Value is provided by the linker script and must be trusted as-is.
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/// - Value is provided by the linker script and must be trusted as-is.
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#[inline(always)]
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#[inline(always)]
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-fn ro_start() -> usize {
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-fn rx_start() -> usize {
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- unsafe { __ro_start.get() as usize }
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- unsafe { __rx_start.get() as usize }
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+fn virt_ro_start() -> Address<Virtual> {
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+fn virt_rx_start() -> Address<Virtual> {
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+ Address::new(unsafe { __ro_start.get() as usize })
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+ Address::new(unsafe { __rx_start.get() as usize })
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}
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}
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/// Size of the Read-Only (RO) range of the kernel binary.
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-/// Exclusive end address of the Read+Execute (RX) range.
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@@ -94,8 +127,42 @@
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+/// Size of the Read+Execute (RX) range.
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///
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/// # Safety
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///
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///
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/// - Value is provided by the linker script and must be trusted as-is.
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/// - Value is provided by the linker script and must be trusted as-is.
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#[inline(always)]
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#[inline(always)]
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-fn ro_end() -> usize {
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-fn rx_end_exclusive() -> usize {
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- unsafe { __ro_end.get() as usize }
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- unsafe { __rx_end_exclusive.get() as usize }
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+fn ro_size() -> usize {
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+fn rx_size() -> usize {
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+ unsafe { __ro_size.get() as usize }
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+ unsafe { (__rx_end_exclusive.get() as usize) - (__rx_start.get() as usize) }
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+}
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+}
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+
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+
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+/// Start address of the data range.
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+/// Start address of the Read+Write (RW) range.
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+#[inline(always)]
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+#[inline(always)]
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+fn virt_data_start() -> Address<Virtual> {
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+fn virt_rw_start() -> Address<Virtual> {
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+ virt_ro_start() + ro_size()
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+ Address::new(unsafe { __rw_start.get() as usize })
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+}
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+}
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+
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+
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+/// Size of the data range.
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+/// Size of the Read+Write (RW) range.
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+///
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+///
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+/// # Safety
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+/// # Safety
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+///
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+///
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+/// - Value is provided by the linker script and must be trusted as-is.
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+/// - Value is provided by the linker script and must be trusted as-is.
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+#[inline(always)]
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+#[inline(always)]
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+fn data_size() -> usize {
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+fn rw_size() -> usize {
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+ unsafe { __data_size.get() as usize }
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+ unsafe { (__rw_end_exclusive.get() as usize) - (__rw_start.get() as usize) }
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+}
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+}
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+
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+
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+/// Start address of the boot core's stack.
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+/// Start address of the boot core's stack.
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+#[inline(always)]
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+#[inline(always)]
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+fn virt_boot_core_stack_start() -> Address<Virtual> {
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+fn virt_boot_core_stack_start() -> Address<Virtual> {
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+ virt_ro_start() - map::BOOT_CORE_STACK_SIZE
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+ Address::new(unsafe { __boot_core_stack_start.get() as usize })
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+}
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+}
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+
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+
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+/// Size of the boot core's stack.
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+/// Size of the boot core's stack.
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+#[inline(always)]
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+#[inline(always)]
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+fn boot_core_stack_size() -> usize {
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+fn boot_core_stack_size() -> usize {
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+ map::BOOT_CORE_STACK_SIZE
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+ unsafe {
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+ (__boot_core_stack_end_exclusive.get() as usize) - (__boot_core_stack_start.get() as usize)
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+ }
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+}
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+
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+/// Start address of the boot core's stack guard page.
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+#[inline(always)]
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+fn virt_boot_core_stack_guard_page_start() -> Address<Virtual> {
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+ Address::new(unsafe { __boot_core_stack_guard_page_start.get() as usize })
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+}
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+
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+/// Size of the boot core's stack guard page.
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+#[inline(always)]
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+fn boot_core_stack_guard_page_size() -> usize {
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+ unsafe {
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+ (__boot_core_stack_guard_page_end_exclusive.get() as usize)
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+ - (__boot_core_stack_guard_page_start.get() as usize)
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+ }
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+}
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+}
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+
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+
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+/// Exclusive end address of the physical address space.
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+/// Exclusive end address of the physical address space.
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@ -1887,12 +1993,12 @@ diff -uNr 14_exceptions_part2_peripheral_IRQs/src/bsp/raspberrypi/memory.rs 15_v
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}
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}
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//--------------------------------------------------------------------------------------------------
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//--------------------------------------------------------------------------------------------------
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@@ -104,8 +171,10 @@
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@@ -103,8 +193,10 @@
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/// Exclusive end address of the boot core's stack.
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/// Exclusive end address of the boot core's stack.
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#[inline(always)]
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#[inline(always)]
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-pub fn boot_core_stack_end() -> usize {
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-pub fn boot_core_stack_end() -> usize {
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- map::BOOT_CORE_STACK_END
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- rx_start()
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+pub fn phys_boot_core_stack_end() -> Address<Physical> {
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+pub fn phys_boot_core_stack_end() -> Address<Physical> {
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+ // The binary is still identity mapped, so we don't need to convert here.
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+ // The binary is still identity mapped, so we don't need to convert here.
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+ let end = virt_boot_core_stack_start().into_usize() + boot_core_stack_size();
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+ let end = virt_boot_core_stack_start().into_usize() + boot_core_stack_size();
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Andre Richter
3 years ago