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Non-distructive assembly stuff

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paging
E. Almqvist 3 years ago
parent e2a5e5c33a
commit 73ece9d19e
1 changed files with 3 additions and 3 deletions
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  1. 6
      kernel/enable_paging.asm

6
kernel/enable_paging.asm
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@ -5,6 +5,7 @@ PAGE_DIRECTORY_ADDR equ 0xffffffff ; TODO: change me to something good
global enable_paging_registers ; make the SR "global" so that we can access it in the kernel etc global enable_paging_registers ; make the SR "global" so that we can access it in the kernel etc
enable_paging_registers: enable_paging_registers:
push eax
mov eax, PAGE_DIRECTORY_ADDR ; Move the address of the mov eax, PAGE_DIRECTORY_ADDR ; Move the address of the
; page register (page directory) into eax ; page register (page directory) into eax
; (Using eax as a middle-man register) ; (Using eax as a middle-man register)
@ -14,10 +15,9 @@ enable_paging_registers:
or eax, PAGING_ENABLE_FLAG ; perform the OR operation on eax (ex: 0b01 or 0b10 = 0b11) or eax, PAGING_ENABLE_FLAG ; perform the OR operation on eax (ex: 0b01 or 0b10 = 0b11)
; This is needed to enable paging (set the flag as "enabled") ; This is needed to enable paging (set the flag as "enabled")
; DANGER: past this op memory will get weird mov cr0, eax ; Move it into cr0 to finally enable paging
; mov cr0, eax ; Move it into cr0 to finally enable paging
; TODO: Make this work to prevent kernel "panic" (actually death) -> bootloop
pop eax
ret ; return to last location ret ; return to last location

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