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mbr: set up first 7 bytes of kernel PSP

This commit is contained in:
Nero 2021-02-18 20:20:40 +00:00
parent 78233db88d
commit d7c1781d2f
1 changed files with 15 additions and 1 deletions
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16
boot/mbr.asm
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@ -6,10 +6,12 @@
init: cli init: cli
mov ax, seg mov ax, seg
mov ss, ax
mov ds, ax mov ds, ax
mov es, ax mov es, ax
mov ss, ax
xor sp, sp xor sp, sp
mov ax, sp
push ax
.retry: mov ax, 0x0208 .retry: mov ax, 0x0208
mov cx, 2 mov cx, 2
@ -19,6 +21,18 @@ init: cli
int 0x13 int 0x13
jc .retry jc .retry
xor di, di
mov ax, 0x18CD
stosw
int 0x12
mov cl, 6
shl ax, cl
stosw
mov al, 2
stosb
mov ax, 0x18CD
stosw
jmp seg:0x100 jmp seg:0x100
times (0x1BE - ($-$$)) db 0 times (0x1BE - ($-$$)) db 0