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Fallback to regular paging for the boot pagetable

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Zhang Junyang 2023-10-13 13:44:57 +08:00 committed by Tate, Hongliang Tian
parent 503252e8e8
commit fb884cd038
1 changed files with 31 additions and 5 deletions
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36
framework/jinux-frame/src/arch/x86/boot/boot.S
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@ -177,26 +177,48 @@ PTE_GLOBAL = (1 << 8)
// Page Directory: map to low 1 GiB * 4 space
lea edi, [boot_pd]
mov eax, (PTE_PRESENT | PTE_WRITE | PTE_GLOBAL | PTE_HUGE) // Map offset 0.
lea eax, [boot_pt + (PTE_PRESENT | PTE_WRITE | PTE_GLOBAL)]
mov ecx, 512 * 4 // (of entries in PD) * (number of PD)
write_pd_entry:
mov dword ptr [edi], eax
mov dword ptr [edi + 4], 0
add eax, 0x200000 // +2MiB
add eax, 0x1000 // +4KiB to next table
add edi, 8
loop write_pd_entry
// Page Directory: map to 1 GiB space offset 32GiB
lea edi, [boot_pd_32g]
mov eax, (PTE_PRESENT | PTE_WRITE | PTE_GLOBAL | PTE_HUGE) // Should +0x800000000 but this is 32-bit.
lea eax, [boot_pt_32g + (PTE_PRESENT | PTE_WRITE | PTE_GLOBAL)]
mov ecx, 512 // (of entries in PD)
write_pd_32g_entry:
mov dword ptr [edi], eax
mov dword ptr [edi + 4], 0x8 // Map offset 32GiB.
add eax, 0x200000 // +2MiB
mov dword ptr [edi + 4], 0x0
add eax, 0x1000 // +4KiB to next table
add edi, 8
loop write_pd_32g_entry
// Page Table: map to low 1 GiB * 4 space
lea edi, [boot_pt]
mov eax, (PTE_PRESENT | PTE_WRITE | PTE_GLOBAL) // Offset 0
mov ecx, 512 * 512 * 4 // (of entries in PT) * (number of PT) * (number of PD)
write_pt_entry:
mov dword ptr [edi], eax
mov dword ptr [edi + 4], 0
add eax, 0x1000 // +4KiB
add edi, 8
loop write_pt_entry
// Page Table: map to 1 GiB space offset 32GiB
lea edi, [boot_pt_32g]
mov eax, (PTE_PRESENT | PTE_WRITE | PTE_GLOBAL) // Offset 0x8_00000000 but should write to high 32bits
mov ecx, 512 * 512 // (of entries in PT) * (number of PT)
write_pt_32g_entry:
mov dword ptr [edi], eax
mov dword ptr [edi + 4], 0x8 // Offset 0x8_00000000
add eax, 0x1000 // +4KiB
add edi, 8
loop write_pt_32g_entry
jmp enable_long_mode
enable_long_mode:
@ -261,8 +283,12 @@ boot_pd_2g_3g:
.skip 4096
boot_pd_3g_4g:
.skip 4096
boot_pt:
.skip 4096 * 512 * 4
boot_pd_32g:
.skip 4096
boot_pt_32g:
.skip 4096 * 512
boot_page_table_end:
boot_stack_bottom: