99 lines
1.3 KiB
Z80 Assembly
99 lines
1.3 KiB
Z80 Assembly
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.global _start
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_start:
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call get_free_mailbox
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ld (mailbox_num), hl
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call get_free_frame ; Set up a frame for sending messages at 0x8000
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ld a, c
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ld (msg_phys_addr), a
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ld (msg_phys_addr+1), hl
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ld b, c
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ld e, l
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ld d, h
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ld c, 8
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call set_frame
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setup_msg:
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ld hl, (mailbox_num)
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ld (0x8000), hl
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ld a, 0x0 ; Register FS operation
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ld (0x8002), a
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ld a, 0x61 ; 'a'
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ld (0x8003), a
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ld a, 0x0 ; '\0'
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ld (0x8004), a
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ld (0x8011), hl
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push de
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push bc
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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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pop bc
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pop de
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ld c, b ; Send the message
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ld ix, 0x0000
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call mb_send
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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, loop
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ld hl, (mailbox_num)
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ld de, 3
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call proc_map_set
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msg_loop:
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call yield
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yield_back:
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ld hl, (mailbox_num)
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call mb_read
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mb_read_done:
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ld a, b
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cp 1
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jp z, msg_loop
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msg_read:
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push bc
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push de
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push hl
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ld b, c
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ld c, 0xB
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call set_frame
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set_frame_done:
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ld hl, (0xB000) ; Load destination mailbox into HL and save it on the stack
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push hl
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ld hl, 0xB002
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; Handling code goes here
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ld a, (hl)
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inc hl
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cp 0x0
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jp z, open
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cp 0x1
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jp z, read
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cp 0x2
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jp z, mount
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operation_done:
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pop hl
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pop ix
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pop de
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pop bc
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call mb_send
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jp msg_loop
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open:
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jp z, operation_done
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read:
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jp z, operation_done
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mount:
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jp z, operation_done
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mailbox_num: .ds.b 2
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msg_phys_addr: .ds.b 2
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