96 lines
1.4 KiB
PHP
96 lines
1.4 KiB
PHP
;; File: bio.inc
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;; Buffer cache
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;; Struc: Buffer
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;;
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;; .dev - Device id
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;; .block - Block number
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;; .ulock - lock
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;; .refcount - refcount
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;; .data - block data
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struc Buffer {
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.dev dw ?
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.flags db ?
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.bcount db ?
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.block dd ?
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.ulock dd ?
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.refcount dd ?
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.data db 1024 dup(?)
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}
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DEFN Buffer
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;; Constants: Buffer flags
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;;
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;; BUFFER_WRITE - XXX
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;; BUFFER_READ - XXX
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;; BUFFER_ERROR - XXX
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;; BUFFER_DIRTY - XXX
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;; BUFFER_INVAL - mark buffer as invalid
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BUFFER_WRITE = 0x0
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BUFFER_READ = 0x1
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BUFFER_ERROR = 0x2
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BUFFER_DIRTY = 0x4
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BUFFER_INVAL = 0x8
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;; Function: bio_init
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bio_init:
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mov ecx, sizeof.Buffer * 30
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xor ax, ax
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mov edi, aBuffers
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rep stosb
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ret
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;; Function: bio_getblk
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;;
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bio_getblk:
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ret
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;; Function: bio_read
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;;
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;; In:
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;; EAX - devid (AH major, AL minor)
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;; ECX - block
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bio_bread:
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push eax
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mov eax, uBIOLock
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call lock_acquire
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pop eax
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movzx ecx, ah
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shl ecx, 2
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add ecx, aBlockDevices
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cmp ecx, aBlockDevices.end
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jb @f
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mov eax, szErrorInvalidDevid
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call klog
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jmp .end
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@@:
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xchg bx, bx
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mov eax, aBuffers
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mov ecx, [ecx]
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mov ecx, [ecx + BlkDev.strategy]
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call ecx
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.end:
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mov eax, uBIOLock
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call lock_release
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ret
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;; Function: bio_bwrite
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bio_bwrite:
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ret
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;; Function: bio_brelse
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;; Unbusy a buffer and release it to the free lists.
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bio_brelse:
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mov eax, uBIOLock
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call lock_acquire
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mov eax, uBIOLock
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call lock_release
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ret
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uBIOLock dd 0
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szErrorInvalidDevid db "Error: invalid devid", 0
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