feat(kernel): block device (WIP)

kernel/bio.inc

@@ -9,7 +9,9 @@
 	;; .refcount - refcount
 	;; .data     - block data
 struc Buffer {
-	.dev      dd ?
+	.dev      dw ?
+	.flags    db ?
+	.bcount   db ?
 	.block    dd ?
 	.ulock    dd ?
 	.refcount dd ?
@@ -17,6 +19,19 @@ struc Buffer {
 }
 DEFN Buffer
 
+	;; Constants: Buffer flags
+	;;
+	;; BUFFER_WRITE - XXX
+	;; BUFFER_READ  - XXX
+	;; BUFFER_ERROR - XXX
+	;; BUFFER_DIRTY - XXX
+	;; BUFFER_INVAL - mark buffer as invalid
+BUFFER_WRITE = 0x0
+BUFFER_READ  = 0x1
+BUFFER_ERROR = 0x2
+BUFFER_DIRTY = 0x4
+BUFFER_INVAL = 0x8
+
 	;; Function: bio_init
 bio_init:
 	mov ecx, sizeof.Buffer * 30
@@ -25,6 +40,11 @@ bio_init:
 	rep stosb
 	ret
 
+	;; Function: bio_getblk
+	;;
+bio_getblk:
+	ret
+
 	;; Function: bio_read
 	;;
 	;; In:
@@ -46,6 +66,8 @@ bio_bread:
 	call klog
 	jmp .end
 @@:
+	xchg bx, bx
+	mov eax, aBuffers
 	mov ecx, [ecx]
 	mov ecx, [ecx + BlkDev.strategy]
 

kernel/dev/at/floppy.inc

@@ -23,6 +23,108 @@ TOTAL_SECTORS       = 2880
 
 FLOPPY_MAX = 2
 
+	;; Constants: Registers
+	;; 
+	;; FLOPPY_STATUS_REGA         - Read-only register
+	;; FLOPPY_STATUS_REGB         - Read-only register
+	;; FLOPPY_DIGITAL_OUTPUT_REG  - XXX
+	;; FLOPPY_TAPE_DRIVE_REG      - XXX
+	;; FLOPPY_MAIN_STATUS_REG     - Read-only register
+	;; FLOPPY_DATARATE_SELECT_REG - Write-only register
+	;; FLOPPY_DATA_FIFO           - XXX
+	;; FLOPPY_DIGITAL_INPUT_REG   - Read-only register
+	;; FLOPPY_CONF_CONTROL_REG    - Write-only register
+FLOPPY_STATUS_REGA         = 0x3F0
+FLOPPY_STATUS_REGB         = 0x3F1
+FLOPPY_DIGITAL_OUTPUT_REG  = 0x3F2
+FLOPPY_TAPE_DRIVE_REG      = 0x3F3
+FLOPPY_MAIN_STATUS_REG     = 0x3F4
+FLOPPY_DATARATE_SELECT_REG = 0x3F4
+FLOPPY_DATA_FIFO           = 0x3F5
+FLOPPY_DIGITAL_INPUT_REG   = 0x3F7
+FLOPPY_CONF_CONTROL_REG    = 0x3F7
+
+	;; Constants: Floppy commands
+	;;
+	;; FLOPPY_READ_TRACK         - XXX
+	;; FLOPPY_SPECIFY            - XXX
+	;; FLOPPY_SENSE_DRIVE_STATUS - XXX
+	;; FLOPPY_WRITE_DATA         - XXX
+	;; FLOPPY_READ_DATA          - XXX
+	;; FLOPPY_RECALIBRATE        - XXX
+	;; FLOPPY_SENSE_INTERRUPT    - XXX
+	;; FLOPPY_WRITE_DELETED_DATA - XXX
+	;; FLOPPY_READ_ID            - XXX
+	;; FLOPPY_READ_DELETED_DATA  - XXX
+	;; FLOPPY_FORMAT_TRACK       - XXX
+	;; FLOPPY_DUMPREG            - XXX
+	;; FLOPPY_SEEK               - XXX
+	;; FLOPPY_VERSION            - XXX
+	;; FLOPPY_SCAN_EQUAL         - XXX
+	;; FLOPPY_PERPENDICULAR_MODE - XXX
+	;; FLOPPY_CONFIGURE          - XXX
+	;; FLOPPY_LOCK               - XXX
+	;; FLOPPY_VERIFY             - XXX
+	;; FLOPPY_SCAN_LOW_OR_EQUAL  - XXX
+	;; FLOPPY_SCAN_HIGH_OR_EQUAL - XXX
+FLOPPY_READ_TRACK         = 2
+FLOPPY_SPECIFY            = 3
+FLOPPY_SENSE_DRIVE_STATUS = 4
+FLOPPY_WRITE_DATA         = 5
+FLOPPY_READ_DATA          = 6
+FLOPPY_RECALIBRATE        = 7
+FLOPPY_SENSE_INTERRUPT    = 8
+FLOPPY_WRITE_DELETED_DATA = 9
+FLOPPY_READ_ID            = 10
+FLOPPY_READ_DELETED_DATA  = 12
+FLOPPY_FORMAT_TRACK       = 13
+FLOPPY_DUMPREG            = 14
+FLOPPY_SEEK               = 15
+FLOPPY_VERSION            = 16
+FLOPPY_SCAN_EQUAL         = 17
+FLOPPY_PERPENDICULAR_MODE = 18
+FLOPPY_CONFIGURE          = 19
+FLOPPY_LOCK               = 20
+FLOPPY_VERIFY             = 22
+FLOPPY_SCAN_LOW_OR_EQUAL  = 25
+FLOPPY_SCAN_HIGH_OR_EQUAL = 29
+
+	;; Constants: DOR bitflag
+	;;
+	;; FLOPPY_DOR_MOTD  - Set to turn drive 3's motor ON
+	;; FLOPPY_DOR_MOTC  - Set to turn drive 2's motor ON
+	;; FLOPPY_DOR_MOTB  - Set to turn drive 1's motor ON
+	;; FLOPPY_DOR_MOTA  - Set to turn drive 0's motor ON
+	;; FLOPPY_DOR_IRQ   - Set to enable IRQs and DMA
+	;; FLOPPY_DOR_RESET - Reset on clear
+	;; FLOPPY_DOR_DSEL  - Select drive
+FLOPPY_DOR_MOTD  = 0x80
+FLOPPY_DOR_MOTC  = 0x40
+FLOPPY_DOR_MOTB  = 0x20
+FLOPPY_DOR_MOTA  = 0x10
+FLOPPY_DOR_IRQ   = 0x08
+FLOPPY_DOR_RESET = 0x04
+FLOPPY_DOR_DSEL  = 0x03 
+
+	;; Constants: MSR bitflag
+	;;
+	;; FLOPPY_MSR_RQM  - XXX
+	;; FLOPPY_MSR_DIO  - XXX
+	;; FLOPPY_MSR_NDMA - XXX
+	;; FLOPPY_MSR_CB   - XXX
+	;; FLOPPY_MSR_ACTD - XXX
+	;; FLOPPY_MSR_ACTC - XXX
+	;; FLOPPY_MSR_ACTB - XXX
+	;; FLOPPY_MSR_ACTA - XXX
+FLOPPY_MSR_RQM  = 0x80
+FLOPPY_MSR_DIO  = 0x40
+FLOPPY_MSR_NDMA = 0x20
+FLOPPY_MSR_CB   = 0x10
+FLOPPY_MSR_ACTD = 0x08
+FLOPPY_MSR_ACTC = 0x04
+FLOPPY_MSR_ACTB = 0x02
+FLOPPY_MSR_ACTA = 0x01
+
 	;; Struct: Floppy
 	;;
 	;; .active - XXX
@@ -100,6 +202,22 @@ floppy_lba_to_chs:
 	;; In:
 	;;    EAX - Address of <Buffer>
 floppy_strategy:
+	push ebp
+	mov esp, ebp
+	sub esp, 4
+	mov [ebp-4], eax
+
+	push esi
+	mov esi, szMsgFdStrat
+	push [eax+Buffer.block]
+	mov ax, [eax+Buffer.dev]
+	movzx ecx, al
+	push ecx
+	call klog
+	pop esi
+
+
+	leave
 	ret
 
 	;; Function: floppy_open
@@ -160,3 +278,4 @@ floppy_bdevsw:
 
 szMsgFloppy0Found db "floppy: fd0 found", 0
 szMsgFloppy1Found db "floppy: fd1 found", 0
+szMsgFdStrat      db "fd%u: strategy (blk: %u)", 0

kernel/fs/xv6fs.inc

@@ -72,6 +72,9 @@ DEFN Xv6FS_Inode
 
 	;; Struc: Xv6FS_Dirent
 	;; xv6FS directory entry
+	;;
+	;; .inum - inode number
+	;; .name - see <XV6FS_DIRSIZE>
 struc Xv6FS_Dirent {
 	.inum dw ?
 	.name db XV6FS_DIRSIZE dup(?)

kernel/kernel.asm

@@ -89,11 +89,18 @@ kmain:
 
 	call vfs_init
 
+	; Root inode
+	; rootino = newino(dev(0.0), BLK)
+	; fs_mountroot(rootino);
+
 	mov ah, 2
 	call bio_bread
 
-	mov eax, SYSCALL_EXIT
+	xor eax, eax
-	int 0x42
+	call bio_bread
+
+	;mov eax, SYSCALL_EXIT
+	;int 0x42
 
 	;mov al, 'X'
 	;call cga_putc

kernel/vfs.inc

@@ -30,7 +30,16 @@ struc VFSOps {
 	.vget   dd ?
 }
 
+	;; Constants: vnode types
 	;;
+	;; VNODE_TYPE_NON  - XXX
+	;; VNODE_TYPE_REG  - XXX
+	;; VNODE_TYPE_DIR  - XXX
+	;; VNODE_TYPE_BLK  - XXX
+	;; VNODE_TYPE_CHR  - XXX
+	;; VNODE_TYPE_LNK  - XXX
+	;; VNODE_TYPE_SOCK - XXX
+	;; VNODE_TYPE_BAD  - XXX
 VNODE_TYPE_NON  = 0x0
 VNODE_TYPE_REG  = 0x1
 VNODE_TYPE_DIR  = 0x2