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kolibrios/kernel/trunk/blkdev/ide_cache.inc
Marat Zakiyanov (Mario79) b229fdc2c2 The universal cache of IDE devices. 
Step 1:
1) Allocate of separate area for everyone IDE device.
2) Usage of the allocated areas for HDD. (Cache CD\DVD - not realized, but the memory for it is allocated. This be realized  in step 2).
3) The area of memory 0x80300000 - > 0x80400000 now is free and is not used.
4) The area of memory 0x80284000 - > 0x8028BFFF is used for HDD DMA.

git-svn-id: svn://kolibrios.org@580 a494cfbc-eb01-0410-851d-a64ba20cac60
2007-07-15 23:22:14 +00:00

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;**************************************************************************
;
; [cache_ide[X]_pointer]
; or [cache_ide[X]_data_pointer] first entry in cache list
;
; +0 - lba sector
; +4 - state of cache sector
; 0 = empty
; 1 = used for read ( same as in hd )
; 2 = used for write ( differs from hd )
;
; [cache_ide[X]_system_data]
; or [cache_ide[x]_appl_data] - cache entries
;
;**************************************************************************
align 4
write_cache:
;-----------------------------------------------------------
; write all changed sectors to disk
;-----------------------------------------------------------
push eax ecx edx esi edi
; write difference ( 2 ) from cache to hd
; mov ecx,cache_max
; mov esi,HD_CACHE+8
call calculate_cache
add esi,8
mov edi,1
write_cache_more:
cmp dword [esi+4],2 ; if cache slot is not different
jne .write_chain
mov dword [esi+4],1 ; same as in hd
mov eax,[esi] ; eax = sector to write
cmp eax,[PARTITION_START]
jb danger
cmp eax,[PARTITION_END]
ja danger
; DMA write is permitted only if [allow_dma_access]=1
cmp [allow_dma_access], 2
jae .nodma
cmp [dma_hdd], 1
jnz .nodma
; Ž¡ê¥¤¨­ï¥¬ § ¯¨áì 楯®çª¨ ¯®á«¥¤®¢ â¥«ì­ëå ᥪâ®à®¢ ¢ ®¤­® ®¡à é¥­¨¥ ª ¤¨áªã
cmp ecx, 1
jz .nonext
cmp dword [esi+8+4], 2
jnz .nonext
push eax
inc eax
cmp eax, [esi+8]
pop eax
jnz .nonext
cmp [cache_chain_started], 1
jz @f
mov [cache_chain_started], 1
mov [cache_chain_size], 0
mov [cache_chain_pos], edi
mov [cache_chain_ptr], esi
@@:
inc [cache_chain_size]
cmp [cache_chain_size], 64
jnz .continue
jmp .write_chain
.nonext:
call flush_cache_chain
mov [cache_chain_size], 1
mov [cache_chain_ptr], esi
call write_cache_sector
jmp .continue
.nodma:
call cache_write_pio
.write_chain:
call flush_cache_chain
.continue:
danger:
add esi,8
inc edi
dec ecx
jnz write_cache_more
call flush_cache_chain
return_02:
pop edi esi edx ecx eax
ret
flush_cache_chain:
cmp [cache_chain_started], 0
jz @f
call write_cache_chain
mov [cache_chain_started], 0
@@:
ret
align 4
find_empty_slot:
;-----------------------------------------------------------
; find empty or read slot, flush cache if next 10% is used by write
; output : edi = cache slot
;-----------------------------------------------------------
; push ecx esi
search_again:
; mov ecx,cache_max*10/100
; mov edi,[cache_search_start]
call calculate_cache_3
; push eax edx
; mov eax,ecx
; mov ecx,10
; xor edx,edx
; div ecx
; mov ecx,eax
; pop edx eax
shr ecx,3
search_for_empty:
inc edi
; cmp edi,cache_max
; push eax
call calculate_cache_4
; cmp edi,eax
; pop eax
jbe inside_cache
mov edi,1
inside_cache:
; cmp dword [edi*8+HD_CACHE+4],2 ; get cache slot info
push esi
call calculate_cache_1
cmp dword [edi*8+esi+4],2
pop esi
jb found_slot ; it's empty or read
dec ecx
jnz search_for_empty
call write_cache ; no empty slots found, write all
cmp [hd_error],0
jne found_slot_access_denied
jmp search_again ; and start again
found_slot:
; mov [cache_search_start],edi
call calculate_cache_5
found_slot_access_denied:
ret
align 4
clear_hd_cache:
; push eax ecx edi
; mov edi, HD_CACHE
; mov ecx,16384
; xor eax,eax
; cld
; rep stosd ; clear hd cache with 0
; mov [cache_search_start],eax
mov [fat_in_cache],-1
mov [fat_change],0
; pop edi ecx eax
ret
;--------------------------------------------------------------------
align 4
calculate_cache:
; mov ecx,cache_max ; entries in cache
; mov esi,HD_CACHE+8
; 1 - IDE0 ... 4 - IDE3
.ide0:
cmp [hdpos],1
jne .ide1
cmp [hdd_appl_data],0
jne .ide0_appl_data
mov ecx,[cache_ide0_system_sad_size]
mov esi,[cache_ide0_pointer]
ret
.ide0_appl_data:
mov ecx,[cache_ide0_appl_sad_size]
mov esi,[cache_ide0_data_pointer]
ret
.ide1:
cmp [hdpos],2
jne .ide2
cmp [hdd_appl_data],0
jne .ide1_appl_data
mov ecx,[cache_ide1_system_sad_size]
mov esi,[cache_ide1_pointer]
ret
.ide1_appl_data:
mov ecx,[cache_ide1_appl_sad_size]
mov esi,[cache_ide1_data_pointer]
ret
.ide2:
cmp [hdpos],3
jne .ide3
cmp [hdd_appl_data],0
jne .ide2_appl_data
mov ecx,[cache_ide2_system_sad_size]
mov esi,[cache_ide2_pointer]
ret
.ide2_appl_data:
mov ecx,[cache_ide2_appl_sad_size]
mov esi,[cache_ide2_data_pointer]
ret
.ide3:
cmp [hdd_appl_data],0
jne .ide3_appl_data
mov ecx,[cache_ide3_system_sad_size]
mov esi,[cache_ide3_pointer]
ret
.ide3_appl_data:
mov ecx,[cache_ide3_appl_sad_size]
mov esi,[cache_ide3_data_pointer]
ret
;--------------------------------------------------------------------
align 4
calculate_cache_1:
; lea esi,[edi*8+HD_CACHE]
; 1 - IDE0 ... 4 - IDE3
.ide0:
cmp [hdpos],1
jne .ide1
cmp [hdd_appl_data],0
jne .ide0_appl_data
mov esi,[cache_ide0_pointer]
ret
.ide0_appl_data:
mov esi,[cache_ide0_data_pointer]
ret
.ide1:
cmp [hdpos],2
jne .ide2
cmp [hdd_appl_data],0
jne .ide1_appl_data
mov esi,[cache_ide1_pointer]
ret
.ide1_appl_data:
mov esi,[cache_ide1_data_pointer]
ret
.ide2:
cmp [hdpos],3
jne .ide3
cmp [hdd_appl_data],0
jne .ide2_appl_data
mov esi,[cache_ide2_pointer]
ret
.ide2_appl_data:
mov esi,[cache_ide2_data_pointer]
ret
.ide3:
cmp [hdd_appl_data],0
jne .ide3_appl_data
mov esi,[cache_ide3_pointer]
ret
.ide3_appl_data:
mov esi,[cache_ide3_data_pointer]
ret
;--------------------------------------------------------------------
align 4
calculate_cache_2:
; add esi,HD_CACHE+65536
; 1 - IDE0 ... 4 - IDE3
.ide0:
cmp [hdpos],1
jne .ide1
cmp [hdd_appl_data],0
jne .ide0_appl_data
mov eax,[cache_ide0_system_data]
ret
.ide0_appl_data:
mov eax,[cache_ide0_appl_data]
ret
.ide1:
cmp [hdpos],2
jne .ide2
cmp [hdd_appl_data],0
jne .ide1_appl_data
mov eax,[cache_ide1_system_data]
ret
.ide1_appl_data:
mov eax,[cache_ide1_appl_data]
ret
.ide2:
cmp [hdpos],3
jne .ide3
cmp [hdd_appl_data],0
jne .ide2_appl_data
mov eax,[cache_ide2_system_data]
ret
.ide2_appl_data:
mov eax,[cache_ide2_appl_data]
ret
.ide3:
cmp [hdd_appl_data],0
jne .ide3_appl_data
mov eax,[cache_ide3_system_data]
ret
.ide3_appl_data:
mov eax,[cache_ide3_appl_data]
ret
;--------------------------------------------------------------------
align 4
calculate_cache_3:
; mov ecx,cache_max*10/100
; mov edi,[cache_search_start]
; 1 - IDE0 ... 4 - IDE3
.ide0:
cmp [hdpos],1
jne .ide1
cmp [hdd_appl_data],0
jne .ide0_appl_data
mov ecx,[cache_ide0_system_sad_size]
mov edi,[cache_ide0_search_start]
ret
.ide0_appl_data:
mov ecx,[cache_ide0_appl_sad_size]
mov edi,[cache_ide0_appl_search_start]
ret
.ide1:
cmp [hdpos],2
jne .ide2
cmp [hdd_appl_data],0
jne .ide1_appl_data
mov ecx,[cache_ide1_system_sad_size]
mov edi,[cache_ide1_search_start]
ret
.ide1_appl_data:
mov ecx,[cache_ide1_appl_sad_size]
mov edi,[cache_ide1_appl_search_start]
ret
.ide2:
cmp [hdpos],3
jne .ide3
cmp [hdd_appl_data],0
jne .ide2_appl_data
mov ecx,[cache_ide2_system_sad_size]
mov edi,[cache_ide2_search_start]
ret
.ide2_appl_data:
mov ecx,[cache_ide2_appl_sad_size]
mov edi,[cache_ide2_appl_search_start]
ret
.ide3:
cmp [hdd_appl_data],0
jne .ide3_appl_data
mov ecx,[cache_ide3_system_sad_size]
mov edi,[cache_ide3_search_start]
ret
.ide3_appl_data:
mov ecx,[cache_ide3_appl_sad_size]
mov edi,[cache_ide3_appl_search_start]
ret
;--------------------------------------------------------------------
align 4
calculate_cache_4:
; cmp edi,cache_max
; 1 - IDE0 ... 4 - IDE3
.ide0:
cmp [hdpos],1
jne .ide1
cmp [hdd_appl_data],0
jne .ide0_appl_data
cmp edi,[cache_ide0_system_sad_size]
ret
.ide0_appl_data:
cmp edi,[cache_ide0_appl_sad_size]
ret
.ide1:
cmp [hdpos],2
jne .ide2
cmp [hdd_appl_data],0
jne .ide1_appl_data
cmp edi,[cache_ide1_system_sad_size]
ret
.ide1_appl_data:
cmp edi,[cache_ide1_appl_sad_size]
ret
.ide2:
cmp [hdpos],3
jne .ide3
cmp [hdd_appl_data],0
jne .ide2_appl_data
cmp edi,[cache_ide2_system_sad_size]
ret
.ide2_appl_data:
cmp edi,[cache_ide2_appl_sad_size]
ret
.ide3:
cmp [hdd_appl_data],0
jne .ide3_appl_data
cmp edi,[cache_ide3_system_sad_size]
ret
.ide3_appl_data:
cmp edi,[cache_ide3_appl_sad_size]
ret
;--------------------------------------------------------------------
align 4
calculate_cache_5:
; mov [cache_search_start],edi
; 1 - IDE0 ... 4 - IDE3
.ide0:
cmp [hdpos],1
jne .ide1
cmp [hdd_appl_data],0
jne .ide0_appl_data
mov [cache_ide0_search_start],edi
ret
.ide0_appl_data:
mov [cache_ide0_appl_search_start],edi
ret
.ide1:
cmp [hdpos],2
jne .ide2
cmp [hdd_appl_data],0
jne .ide1_appl_data
mov [cache_ide1_search_start],edi
ret
.ide1_appl_data:
mov [cache_ide1_appl_search_start],edi
ret
.ide2:
cmp [hdpos],3
jne .ide3
cmp [hdd_appl_data],0
jne .ide2_appl_data
mov [cache_ide2_search_start],edi
ret
.ide2_appl_data:
mov [cache_ide2_appl_search_start],edi
ret
.ide3:
cmp [hdd_appl_data],0
jne .ide3_appl_data
mov [cache_ide3_search_start],edi
ret
.ide3_appl_data:
mov [cache_ide3_appl_search_start],edi
ret
;--------------------------------------------------------------------
align 4
calculate_linear_to_real:
shr eax, 12
mov eax, [page_tabs+eax*4]
and eax, 0xFFFFF000
ret
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