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PAGE_SIZE = 0x1000
PAGE_PRESENT = (1 shl 0)
PAGE_WRITE = (1 shl 1)
macro page_table_init_real pml4_table* {
local page_table
; zero out page table
mov edi, pml4_table
push di
mov ecx, (PAGE_SIZE*4)/4
xor eax, eax
cld
rep stosd
pop di
virtual at di
label page_table
.PML4T rb PAGE_SIZE
.PDPT rb PAGE_SIZE
.PDT rb PAGE_SIZE
.PT rb PAGE_SIZE
.sizeof = $ - page_table
end virtual
; create first entry
mov word [.PML4T], (pml4_table + .PDPT - page_table) or PAGE_PRESENT or PAGE_WRITE
mov word [.PDPT], (pml4_table + .PDT - page_table) or PAGE_PRESENT or PAGE_WRITE
mov word [.PDT], (pml4_table + .PT - page_table) or PAGE_PRESENT or PAGE_WRITE
; identity map pages
push di
mov di, (pml4_table + .PT - page_table)
mov ax, (PAGE_PRESENT or PAGE_WRITE)
@@:
mov [di], eax
add eax, PAGE_SIZE
add di, 8
cmp di, pml4_table + .sizeof
jb @b
pop di
}
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