forked from KolibriOS/kolibrios
ebeed28881
* 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
195 lines
4.4 KiB
PHP
195 lines
4.4 KiB
PHP
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$Revision: 0 $
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pusha
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mov eax,[pg_data.pages_free]
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; 1/32
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shr eax,5
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; round off up to 8 pages
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shr eax,3
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shl eax,3
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; translate pages in butes *4096
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shl eax,12
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; check a upper size of the cache, no more than 1 Mb on the physical device
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cmp eax,1024*1024
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jbe @f
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mov eax,1024*1024
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jmp .continue
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@@:
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; check a lower size of the cache, not less than 128 Kb on the physical device
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cmp eax,128*1024
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jae @f
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mov eax,128*1024
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@@:
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.continue:
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mov [cache_ide0_size],eax
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mov [cache_ide1_size],eax
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mov [cache_ide2_size],eax
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mov [cache_ide3_size],eax
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xor eax,eax
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mov [hdd_appl_data],1 ;al
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mov [cd_appl_data],1
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mov ch,[DRIVE_DATA+1]
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mov cl,ch
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and cl,11b
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je .ide2
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mov esi,cache_ide3
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call get_cache_ide
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.ide2:
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mov cl,ch
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shr cl,2
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and cl,11b
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je .ide1
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mov esi,cache_ide2
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call get_cache_ide
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.ide1:
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mov cl,ch
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shr cl,4
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and cl,11b
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je .ide0
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mov esi,cache_ide1
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call get_cache_ide
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.ide0:
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mov cl,ch
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shr cl,6
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and cl,11b
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je @f
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mov esi,cache_ide0
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call get_cache_ide
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@@:
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xor ecx,ecx
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cmp [NumBiosDisks],ecx
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jz .endbd
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mov esi,BiosDiskCaches
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.loopbd:
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cmp byte [BiosDisksData+ecx*4+2],-1
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jnz .contbd
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mov eax,[cache_ide0_size]
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mov [esi+cache_ide0_size-cache_ide0],eax
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push ecx
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mov cl,1
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call get_cache_ide
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pop ecx
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.contbd:
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add esi,cache_ide1-cache_ide0
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inc ecx
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cmp ecx,[NumBiosDisks]
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jb .loopbd
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.endbd:
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jmp end_get_cache
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get_cache_ide:
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and [esi+cache_ide0_search_start-cache_ide0],0
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and [esi+cache_ide0_appl_search_start-cache_ide0],0
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push ecx
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stdcall kernel_alloc,[esi+cache_ide0_size-cache_ide0]
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mov [esi+cache_ide0_pointer-cache_ide0],eax
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pop ecx
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mov edx,eax
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mov eax,[esi+cache_ide0_size-cache_ide0]
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shr eax,3
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mov [esi+cache_ide0_system_data_size-cache_ide0],eax
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mov ebx,eax
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imul eax,7
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mov [esi+cache_ide0_appl_data_size-cache_ide0],eax
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add ebx,edx
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mov [esi+cache_ide0_data_pointer-cache_ide0],ebx
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cmp cl,10b
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je .cd
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push ecx
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mov eax,[esi+cache_ide0_system_data_size-cache_ide0]
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call calculate_for_hd
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add eax,[esi+cache_ide0_pointer-cache_ide0]
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mov [esi+cache_ide0_system_data-cache_ide0],eax
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mov [esi+cache_ide0_system_sad_size-cache_ide0],ecx
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push edi
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mov edi,[esi+cache_ide0_pointer-cache_ide0]
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call clear_ide_cache
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pop edi
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mov eax,[esi+cache_ide0_appl_data_size-cache_ide0]
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call calculate_for_hd
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add eax,[esi+cache_ide0_data_pointer-cache_ide0]
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mov [esi+cache_ide0_appl_data-cache_ide0],eax
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mov [esi+cache_ide0_appl_sad_size-cache_ide0],ecx
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push edi
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mov edi,[esi+cache_ide0_data_pointer-cache_ide0]
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call clear_ide_cache
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pop edi
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pop ecx
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ret
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.cd:
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push ecx
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mov eax,[esi+cache_ide0_system_data_size-cache_ide0]
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call calculate_for_cd
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add eax,[esi+cache_ide0_pointer-cache_ide0]
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mov [esi+cache_ide0_system_data-cache_ide0],eax
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mov [esi+cache_ide0_system_sad_size-cache_ide0],ecx
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push edi
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mov edi,[esi+cache_ide0_pointer-cache_ide0]
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call clear_ide_cache
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pop edi
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mov eax,[esi+cache_ide0_appl_data_size-cache_ide0]
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call calculate_for_cd
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add eax,[esi+cache_ide0_data_pointer-cache_ide0]
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mov [esi+cache_ide0_appl_data-cache_ide0],eax
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mov [esi+cache_ide0_appl_sad_size-cache_ide0],ecx
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push edi
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mov edi,[esi+cache_ide0_data_pointer-cache_ide0]
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call clear_ide_cache
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pop edi
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pop ecx
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ret
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calculate_for_hd:
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push eax
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mov ebx,eax
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shr eax,9
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shl eax,3
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sub ebx,eax
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shr ebx,9
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mov ecx,ebx
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shl ebx,9
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pop eax
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sub eax,ebx
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dec ecx
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ret
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calculate_for_cd:
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push eax
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mov ebx,eax
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shr eax,11
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shl eax,3
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sub ebx,eax
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shr ebx,11
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mov ecx,ebx
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shl ebx,11
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pop eax
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sub eax,ebx
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dec ecx
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ret
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clear_ide_cache:
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push eax
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shl ecx,1
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xor eax,eax
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cld
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rep stosd
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pop eax
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ret
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end_get_cache:
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; mov [cache_ide0_pointer],HD_CACHE
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; mov [cache_ide0_system_data],HD_CACHE+65536
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; mov [cache_ide0_system_sad_size],1919
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popa |