diff options
Diffstat (limited to 'Kernel/Arch/aarch64/MMU.cpp')
| -rw-r--r-- | Kernel/Arch/aarch64/MMU.cpp | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/Kernel/Arch/aarch64/MMU.cpp b/Kernel/Arch/aarch64/MMU.cpp index 2b4a336988..1c4a1d1f26 100644 --- a/Kernel/Arch/aarch64/MMU.cpp +++ b/Kernel/Arch/aarch64/MMU.cpp @@ -21,6 +21,8 @@ // These come from the linker script extern u8 page_tables_phys_start[]; extern u8 page_tables_phys_end[]; +extern u8 start_of_kernel_image[]; +extern u8 end_of_kernel_image[]; namespace Kernel { @@ -122,7 +124,11 @@ static void build_identity_map(PageBumpAllocator& allocator) u64 normal_memory_flags = ACCESS_FLAG | PAGE_DESCRIPTOR | INNER_SHAREABLE | NORMAL_MEMORY; u64 device_memory_flags = ACCESS_FLAG | PAGE_DESCRIPTOR | OUTER_SHAREABLE | DEVICE_MEMORY; - insert_identity_entries_for_physical_memory_range(allocator, level1_table, START_OF_NORMAL_MEMORY, END_OF_NORMAL_MEMORY, normal_memory_flags); + // Align the identity mapping of the kernel image to 2 MiB, the rest of the memory is initially not mapped. + FlatPtr start_of_range = ((FlatPtr)start_of_kernel_image & ~(FlatPtr)0x1fffff); + FlatPtr end_of_range = ((FlatPtr)end_of_kernel_image & ~(FlatPtr)0x1fffff) + 0x200000 - 1; + + insert_identity_entries_for_physical_memory_range(allocator, level1_table, start_of_range, end_of_range, normal_memory_flags); insert_identity_entries_for_physical_memory_range(allocator, level1_table, RPi::MMIO::the().peripheral_base_address(), RPi::MMIO::the().peripheral_end_address(), device_memory_flags); } |