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kernel: Make delay_ms use HPET when available.

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I got a laptop that has timer on channel 1 of PIT that doesn't tick.

git-svn-id: svn://kolibrios.org@8139 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Ivan Baravy 2020-11-05 19:53:54 +00:00
parent e923e0d4db
commit dd55ceaa16
1 changed files with 32 additions and 10 deletions
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42
kernel/trunk/kernel.asm
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@ -556,7 +556,6 @@ high_code:
mov eax, [hpet_base]
test eax, eax
jz @F
mov eax, [hpet_base]
stdcall map_io_mem, [hpet_base], 1024, PG_GLOBAL+PAT_UC+PG_SWR
mov [hpet_base], eax
mov eax, [eax+HPET_ID]
@ -3931,9 +3930,33 @@ endg
;-----------------------------------------------------------------------------
align 4
delay_ms: ; delay in 1/1000 sec
push eax
push ecx
pushad
cmp [hpet_base], 0
jz .no_hpet
mov eax, esi
mov edx, 10_000_000 ; cs to ns
mul edx
mov ebx, edx
mov ecx, eax
push ecx
call get_clock_ns
pop ecx
mov edi, edx
mov esi, eax
.wait:
push ecx
call get_clock_ns
pop ecx
sub eax, esi
sbb edx, edi
sub eax, ecx
sbb edx, ebx
jc .wait
jmp .done
.no_hpet:
mov ecx, esi
; <CPU clock fix by Sergey Kuzmin aka Wildwest>
imul ecx, 33941
@ -3944,19 +3967,18 @@ delay_ms: ; delay in 1/1000 sec
and al, 0x10
mov ah, al
cld
;--------------------------------------
align 4
cnt1:
.cnt1:
in al, 0x61
and al, 0x10
cmp al, ah
jz cnt1
jz .cnt1
mov ah, al
loop cnt1
loop .cnt1
pop ecx
pop eax
.done:
popad
ret
;-----------------------------------------------------------------------------
align 4