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Kernel: boot.S maps GiB as single pdpte

This commit is contained in:
Bananymous 2023-05-31 00:42:24 +03:00
parent 8175348284
commit eafa09fecf
1 changed files with 4 additions and 10 deletions
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14
kernel/arch/x86_64/boot.S
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@ -49,7 +49,7 @@
.section .text
# Identity map first GiB
# Map first GiB to 0x00000000 and 0xFFFFFFFF80000000
.align 4096
boot_pml4:
.quad V2P(boot_pdpt_lo) + (PG_READ_WRITE | PG_PRESENT)
@ -58,22 +58,16 @@ boot_pml4:
.endr
.quad V2P(boot_pdpt_hi) + (PG_READ_WRITE | PG_PRESENT)
boot_pdpt_lo:
.quad V2P(boot_pd) + (PG_READ_WRITE | PG_PRESENT)
.quad 0x00000000 + (PG_PAGE_SIZE | PG_READ_WRITE | PG_PRESENT)
.rept 511
.quad 0
.endr
boot_pdpt_hi:
.rept 510
.quad 0
.endr
.quad V2P(boot_pd) + (PG_READ_WRITE | PG_PRESENT)
.quad 0
boot_pd: # 1 GiB
.set i, 0
.rept 512
.quad i + (PG_PAGE_SIZE | PG_READ_WRITE | PG_PRESENT)
.set i, i + 0x00200000
.endr
.quad 0x00000000 + (PG_PAGE_SIZE | PG_READ_WRITE | PG_PRESENT)
.quad 0
boot_gdt:
.quad 0x0000000000000000 # null descriptor