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Kernel: Make PageDirectory.h architecture specific

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The page table and page directory formats are architecture specific, so
move the headers into the Arch directory. Also move the aarch64 page
table constants from aarch64/MMU.cpp to aarch64/PageDirectory.h.
This commit is contained in:
Timon Kruiper 2022-09-21 15:26:27 +02:00 • committed by Andreas Kling
parent ad5e8bbb4f
commit cdf59c86ac
4 changed files with 332 additions and 166 deletions
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21
Kernel/Arch/aarch64/MMU.cpp
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@ -8,6 +8,7 @@
#include <Kernel/Arch/aarch64/CPU.h>
#include <Kernel/Arch/PageDirectory.h>
#include <Kernel/Arch/aarch64/ASM_wrapper.h>
#include <Kernel/Arch/aarch64/RPi/MMIO.h>
#include <Kernel/Arch/aarch64/RPi/UART.h>
@ -27,26 +28,6 @@ namespace Kernel {
constexpr u32 START_OF_NORMAL_MEMORY = 0x00000000;
constexpr u32 END_OF_NORMAL_MEMORY = 0x3EFFFFFF;
// 4KiB page size was chosen for the prekernel to make this code slightly simpler
constexpr u32 GRANULE_SIZE = 0x1000;
constexpr u32 PAGE_TABLE_SIZE = 0x1000;
// Documentation for translation table format
// https://developer.arm.com/documentation/101811/0101/Controlling-address-translation
constexpr u32 PAGE_DESCRIPTOR = 0b11;
constexpr u32 TABLE_DESCRIPTOR = 0b11;
constexpr u32 DESCRIPTOR_MASK = ~0b11;
constexpr u32 ACCESS_FLAG = 1 << 10;
// shareability
constexpr u32 OUTER_SHAREABLE = (2 << 8);
constexpr u32 INNER_SHAREABLE = (3 << 8);
// these index into the MAIR attribute table
constexpr u32 NORMAL_MEMORY = (0 << 2);
constexpr u32 DEVICE_MEMORY = (1 << 2);
ALWAYS_INLINE static u64* descriptor_to_pointer(FlatPtr descriptor)
{
return (u64*)(descriptor & DESCRIPTOR_MASK);