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Kernel/aarch64: Access MMIO using mapping in high virtual memory

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This ensures that we can unmap the identity mapping of the kernel in
physical memory.
This commit is contained in:
Timon Kruiper 2023-01-07 11:40:23 +01:00 • committed by Linus Groh
parent 91d0451999
commit 5db32ecbe1
3 changed files with 12 additions and 7 deletions
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4
Kernel/Arch/aarch64/MMU.cpp
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@ -143,8 +143,8 @@ static void build_mappings(PageBumpAllocator& allocator, u64* root_table)
// Align the identity mapping of the kernel image to 2 MiB, the rest of the memory is initially not mapped.
auto start_of_kernel_range = VirtualAddress(((FlatPtr)start_of_kernel_image + KERNEL_MAPPING_BASE) & ~(FlatPtr)0x1fffff);
auto end_of_kernel_range = VirtualAddress((((FlatPtr)end_of_kernel_image + KERNEL_MAPPING_BASE) & ~(FlatPtr)0x1fffff) + 0x200000 - 1);
auto start_of_mmio_range = VirtualAddress(RPi::MMIO::the().peripheral_base_address() + KERNEL_MAPPING_BASE);
auto end_of_mmio_range = VirtualAddress(RPi::MMIO::the().peripheral_end_address() + KERNEL_MAPPING_BASE);
auto start_of_mmio_range = VirtualAddress(RPi::MMIO::the().peripheral_base_address().offset(KERNEL_MAPPING_BASE).get());
auto end_of_mmio_range = VirtualAddress(RPi::MMIO::the().peripheral_end_address().offset(KERNEL_MAPPING_BASE).get());
auto start_of_physical_kernel_range = PhysicalAddress(start_of_kernel_range.get()).offset(-KERNEL_MAPPING_BASE);
auto start_of_physical_mmio_range = PhysicalAddress(start_of_mmio_range.get()).offset(-KERNEL_MAPPING_BASE);