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small optimization sys_sheduler

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git-svn-id: svn://kolibrios.org@1344 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Alexey Teplov ( 2009-12-31 02:14:07 +00:00
parent d1bdc45e2f
commit 22dfbb516f
1 changed files with 46 additions and 61 deletions
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107
kernel/trunk/kernel.asm
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@ -3397,82 +3397,67 @@ endg
;3 - rdmsr. Counter in edx. (edx:eax) [esi:edi, edx] => [edx:esi, ecx]. Ret in ebx:eax. Block. ok.
;4 - wrmsr. Counter in edx. (edx:eax) [esi:edi, edx] => [edx:esi, ecx]. Ret in ebx:eax. Block. ok.
;---------------------------------------------------------------------------------------------
iglobal
align 4
sheduler:
dd sys_sheduler.00
dd change_task
dd sys_sheduler.02
dd sys_sheduler.03
dd sys_sheduler.04
endg
sys_sheduler:
; old sys_sheduler ;noname & halyavin
; cmp eax,0
; je shed_counter
; cmp eax,2
; je perf_control
; cmp eax,3
; je rdmsr_instr
; cmp eax,4
; je wrmsr_instr
; cmp eax,1
; jne not_supported
; call change_task ;delay,0
;rewritten by <Lrz> 29.12.2009
jmp dword [sheduler+eax*4]
;.shed_counter:
.00:
mov eax,[context_counter]
mov [esp+36],eax
ret
;rewritten by <Lrz> 15.11.2009
test eax,eax
jz .shed_counter ;eax=0
dec eax
jz change_task ;eax=1
dec eax
jz .perf_control ;eax=2
dec eax
jz .rdmsr_instr ;eax=3
dec eax
jnz @f
;wrmsr_instr ;eax=4
.02:
;.perf_control:
test ebx,ebx
jz modify_pce ;if ecx=0
dec ebx
jz is_cache_enabled ;if ecx=1
dec ebx
jz cache_enable ;if ecx=2
ret
.03:
;.rdmsr_instr:
;now counter in ecx
;(edx:eax) esi:edi => edx:esi
mov eax,esi
; mov ecx,edx
rdmsr
mov [esp+36],eax
mov [esp+24],edx ;ret in ebx?
ret
.04:
;.wrmsr_instr:
;now counter in ecx
;(edx:eax) esi:edi => edx:esi
; Fast Call MSR can't be destroy
; <20>® MSR_AMD_EFER ¬®¦­® ¨§¬¥­ïâì, â.ª. ¢ í⮬ ॣ¨áâॠ«¨è
; ¢ª«îç îâáï/¢ëª«îç îâáï à áè¨à¥­­ë¥ ¢®§¬®¦­®áâ¨
cmp ecx, MSR_SYSENTER_CS
cmp ecx,MSR_SYSENTER_CS
je @f
cmp ecx, MSR_SYSENTER_ESP
cmp ecx,MSR_SYSENTER_ESP
je @f
cmp ecx, MSR_SYSENTER_EIP
cmp ecx,MSR_SYSENTER_EIP
je @f
cmp ecx, MSR_AMD_STAR
cmp ecx,MSR_AMD_STAR
je @f
mov eax, esi
mov eax,esi
; mov ecx,edx
wrmsr
; mov [esp + 36], eax
; mov [esp + 24], edx ;ret in ebx?
; mov [esp + 32], eax
; mov [esp + 20], edx ;ret in ebx?
@@:
ret
.shed_counter:
mov eax,[context_counter]
mov [esp+36],eax
ret
.perf_control:
; inc eax ;now eax=3
add eax,3 ;restore eax=3
cmp ebx,eax
je cache_disable
dec eax
cmp ebx,eax
je cache_enable
dec eax
cmp ebx,eax
je is_cache_enabled
dec eax
cmp ebx,eax
je modify_pce
ret
.rdmsr_instr:
;now counter in ecx
;(edx:eax) esi:edi => edx:esi
mov eax,esi
rdmsr
mov [esp+36],eax
mov [esp+24],edx ;ret in ebx?
ret
ret
cache_disable:
mov eax,cr0