203 lines
3.4 KiB
Z80 Assembly
203 lines
3.4 KiB
Z80 Assembly
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.global libvfs_init
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; Pointer to message frame in HL
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; Physical address of message frame in C:DE
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; Clobbers A, BC, DE, HL, IX
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libvfs_init:
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ld (msg_frame_ptr), hl
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ld a, c
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ld (msg_frame_phys), a
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ld (msg_frame_phys+1), de
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call get_free_mailbox ; Initialize a mailbox
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ld (mailbox_num), hl
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ret
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.global libvfs_register_fs
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; Registers a FS with the VFS
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; Mailbox in HL, pointer to name in IX
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; Clobbers A, BC, DE, HL, IX, IY
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libvfs_register_fs:
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push hl
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ld iy, (msg_frame_ptr)
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ld hl, (mailbox_num)
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ld (iy), l
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ld (iy+1), h
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ld a, 0x0 ; Register FS operation
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ld (iy+2), a
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ld bc, 7
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push ix
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pop hl
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ld d, iyh
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ld e, 0x3
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call strcpy
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pop hl
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ld (iy+0x11), l
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ld (iy+0x12), h
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ld de, 2 ; Get the mailbox number for the VFS
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call proc_map_get
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pmg_done:
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ld a, (msg_frame_phys)
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ld c, a
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ld de, (msg_frame_phys+1)
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ld ix, 0x0000
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call mb_send
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reg_fs_loop:
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call yield
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loop_yield_done:
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ld hl, (mailbox_num)
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call mb_read ; Read a message
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reg_fs_mb_read_done:
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ld a, b ; Loop if there is no message
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cp 0
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jp nz, reg_fs_loop
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ret
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.global libvfs_mount
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; Mounts a FS
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; Device string in BC
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; Path string in DE
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; FS name string in HL
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; Clobbers A, BC, DE, HL, IX, IY
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libvfs_mount:
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push hl
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push bc
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push de
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ld iy, (msg_frame_ptr)
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ld hl, (mailbox_num)
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ld (iy), l
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ld (iy+1), h
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ld a, 0x1 ; Mount operation
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ld (iy+2), a
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ld d, iyh
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ld e, 0x3
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pop hl
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call strcpy
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ld d, iyh
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ld e, 0xFF
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pop hl
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call strcpy
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ld d, iyh
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inc d
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ld e, 0xFF
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pop hl
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call strcpy
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ld de, 2 ; Get the mailbox number for the VFS
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call proc_map_get
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mount_pmg_done:
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; Send the message
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ld a, (msg_frame_phys)
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ld c, a
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ld de, (msg_frame_phys+1)
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ld ix, 0x0000
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call mb_send
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mount_loop:
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call yield
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mount_loop_yield_done:
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ld hl, (mailbox_num)
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call mb_read ; Read a message
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mount_mb_read_done:
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ld a, b ; Loop if there is no message
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cp 0
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jp nz, mount_loop
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mount_done:
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ret
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.global libvfs_open
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; Opens a file
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; Path in HL
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; Pointer to 4-byte buffer in DE (file info saved there)
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; FD returned in DE, MBID of FS in HL
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; Clobbers A, BC, DE, HL, IX, IY
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libvfs_open:
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push de
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push hl
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ld iy, (msg_frame_ptr)
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ld hl, (mailbox_num)
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ld (iy), l
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ld (iy+1), h
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ld a, 0x2 ; Open operation
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ld (iy+2), a
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ld d, iyh
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ld e, 0x3
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pop hl
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call strcpy
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ld de, 2 ; Get the mailbox number for the VFS
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call proc_map_get
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open_pmg_done:
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; Send the message
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ld a, (msg_frame_phys)
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ld c, a
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ld de, (msg_frame_phys+1)
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ld ix, 0x0000
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call mb_send
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open_loop:
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call yield
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open_loop_yield_done:
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ld hl, (mailbox_num)
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call mb_read ; Read a message
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open_mb_read_done:
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ld a, b ; Loop if there is no message
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cp 0
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jp nz, open_loop
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open_done:
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ld hl, (msg_frame_ptr)
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pop de
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ld bc, 4
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ldir
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ret
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.global libvfs_read
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; Reads data from an open file
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; Pointer to file struct in HL
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; Data length in BC
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; Offset in DE
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; Buffer returned in HL
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; BUFFER INVALIDATED WHEN MESSAGE IS NEXT SENT
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; WITH FRAME GIVEN ON INIT
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libvfs_read:
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push hl
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ld iy, (msg_frame_ptr)
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ld hl, (mailbox_num)
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ld (iy), l
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ld (iy+1), h
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pop hl
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ld a, 0x1 ; Read operation
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ld (iy+2), a
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ld a, (hl)
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ld (iy+3), c
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inc hl
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ld a, (hl)
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ld (iy+4), b
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inc hl
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ld (iy+5), e
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ld (iy+6), d
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ld (iy+7), c
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ld (iy+8), b
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; Send the message
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ld c, (hl)
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inc hl
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ld b, (hl)
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push bc
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pop hl
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ld a, (msg_frame_phys)
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ld c, a
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ld de, (msg_frame_phys+1)
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ld ix, 0x0000
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call mb_send
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read_loop:
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call yield
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read_loop_yield_done:
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ld hl, (mailbox_num)
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call mb_read ; Read a message
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read_mb_read_done:
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ld a, b ; Loop if there is no message
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cp 0
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jp nz, read_loop
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read_done:
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ld hl, (msg_frame_ptr)
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ret
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.bss
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mailbox_num: .ds.b 2
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msg_frame_ptr: .ds.b 2
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msg_frame_phys: .ds.b 3
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