kolibrios/kernel/trunk/detect/getcache.inc
Evgeny Grechnikov (Diamond) ebeed28881 * V86 manager
* support of drives visible by BIOS through V86 mode
* shutdown fixes
* background redraw fixes
* when booting from CD/DVD, load all floppy by tracks, not only used sectors

git-svn-id: svn://kolibrios.org@709 a494cfbc-eb01-0410-851d-a64ba20cac60
2008-02-04 15:31:59 +00:00

195 lines
4.4 KiB
PHP

$Revision: 0 $
pusha
mov eax,[pg_data.pages_free]
; 1/32
shr eax,5
; round off up to 8 pages
shr eax,3
shl eax,3
; translate pages in butes *4096
shl eax,12
; check a upper size of the cache, no more than 1 Mb on the physical device
cmp eax,1024*1024
jbe @f
mov eax,1024*1024
jmp .continue
@@:
; check a lower size of the cache, not less than 128 Kb on the physical device
cmp eax,128*1024
jae @f
mov eax,128*1024
@@:
.continue:
mov [cache_ide0_size],eax
mov [cache_ide1_size],eax
mov [cache_ide2_size],eax
mov [cache_ide3_size],eax
xor eax,eax
mov [hdd_appl_data],1 ;al
mov [cd_appl_data],1
mov ch,[DRIVE_DATA+1]
mov cl,ch
and cl,11b
je .ide2
mov esi,cache_ide3
call get_cache_ide
.ide2:
mov cl,ch
shr cl,2
and cl,11b
je .ide1
mov esi,cache_ide2
call get_cache_ide
.ide1:
mov cl,ch
shr cl,4
and cl,11b
je .ide0
mov esi,cache_ide1
call get_cache_ide
.ide0:
mov cl,ch
shr cl,6
and cl,11b
je @f
mov esi,cache_ide0
call get_cache_ide
@@:
xor ecx,ecx
cmp [NumBiosDisks],ecx
jz .endbd
mov esi,BiosDiskCaches
.loopbd:
cmp byte [BiosDisksData+ecx*4+2],-1
jnz .contbd
mov eax,[cache_ide0_size]
mov [esi+cache_ide0_size-cache_ide0],eax
push ecx
mov cl,1
call get_cache_ide
pop ecx
.contbd:
add esi,cache_ide1-cache_ide0
inc ecx
cmp ecx,[NumBiosDisks]
jb .loopbd
.endbd:
jmp end_get_cache
get_cache_ide:
and [esi+cache_ide0_search_start-cache_ide0],0
and [esi+cache_ide0_appl_search_start-cache_ide0],0
push ecx
stdcall kernel_alloc,[esi+cache_ide0_size-cache_ide0]
mov [esi+cache_ide0_pointer-cache_ide0],eax
pop ecx
mov edx,eax
mov eax,[esi+cache_ide0_size-cache_ide0]
shr eax,3
mov [esi+cache_ide0_system_data_size-cache_ide0],eax
mov ebx,eax
imul eax,7
mov [esi+cache_ide0_appl_data_size-cache_ide0],eax
add ebx,edx
mov [esi+cache_ide0_data_pointer-cache_ide0],ebx
cmp cl,10b
je .cd
push ecx
mov eax,[esi+cache_ide0_system_data_size-cache_ide0]
call calculate_for_hd
add eax,[esi+cache_ide0_pointer-cache_ide0]
mov [esi+cache_ide0_system_data-cache_ide0],eax
mov [esi+cache_ide0_system_sad_size-cache_ide0],ecx
push edi
mov edi,[esi+cache_ide0_pointer-cache_ide0]
call clear_ide_cache
pop edi
mov eax,[esi+cache_ide0_appl_data_size-cache_ide0]
call calculate_for_hd
add eax,[esi+cache_ide0_data_pointer-cache_ide0]
mov [esi+cache_ide0_appl_data-cache_ide0],eax
mov [esi+cache_ide0_appl_sad_size-cache_ide0],ecx
push edi
mov edi,[esi+cache_ide0_data_pointer-cache_ide0]
call clear_ide_cache
pop edi
pop ecx
ret
.cd:
push ecx
mov eax,[esi+cache_ide0_system_data_size-cache_ide0]
call calculate_for_cd
add eax,[esi+cache_ide0_pointer-cache_ide0]
mov [esi+cache_ide0_system_data-cache_ide0],eax
mov [esi+cache_ide0_system_sad_size-cache_ide0],ecx
push edi
mov edi,[esi+cache_ide0_pointer-cache_ide0]
call clear_ide_cache
pop edi
mov eax,[esi+cache_ide0_appl_data_size-cache_ide0]
call calculate_for_cd
add eax,[esi+cache_ide0_data_pointer-cache_ide0]
mov [esi+cache_ide0_appl_data-cache_ide0],eax
mov [esi+cache_ide0_appl_sad_size-cache_ide0],ecx
push edi
mov edi,[esi+cache_ide0_data_pointer-cache_ide0]
call clear_ide_cache
pop edi
pop ecx
ret
calculate_for_hd:
push eax
mov ebx,eax
shr eax,9
shl eax,3
sub ebx,eax
shr ebx,9
mov ecx,ebx
shl ebx,9
pop eax
sub eax,ebx
dec ecx
ret
calculate_for_cd:
push eax
mov ebx,eax
shr eax,11
shl eax,3
sub ebx,eax
shr ebx,11
mov ecx,ebx
shl ebx,11
pop eax
sub eax,ebx
dec ecx
ret
clear_ide_cache:
push eax
shl ecx,1
xor eax,eax
cld
rep stosd
pop eax
ret
end_get_cache:
; mov [cache_ide0_pointer],HD_CACHE
; mov [cache_ide0_system_data],HD_CACHE+65536
; mov [cache_ide0_system_sad_size],1919
popa