kotovalexarian-likes-gitlab/bztsrc--bootboot
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Use BIOS service for delay

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bzt 2020-10-28 12:55:22 +01:00
parent 0f5414e8c0
commit d154161bea
3 changed files with 5 additions and 12 deletions
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dist/bootboot.bin vendored
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2
mkbootimg/data.c
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15
x86_64-bios/bootboot.asm
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@ -471,17 +471,10 @@ a20ok:
real_print backup
jmp .waitend
@@: ; wait 10 millisec
mov cx, 10000/15
in al, 61h ; ps2 control port bit 4 is oscillating at 15 usec
and al, 10h
mov ah, al
@@: in al, 61h
and al, 10h
cmp al, ah
je @b
mov ah, al
dec cx
jnz @b
xor cx, cx
mov dx, 10000
mov ah, 086h
int 15h
; repeat loop 50 times
inc word [origcount]
cmp word [origcount], 50