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- ; named shell_.asm to avoid infinite include loop.
- .equ RAMSTART 0x4000
- ; kernel ram is well under 0x100 bytes. We're giving us 0x200 bytes so that we
- ; never worry about the stack.
- .equ KERNEL_RAMEND 0x4200
- .equ USERCODE KERNEL_RAMEND
- .equ STDIO_PORT 0x00
- .equ FS_DATA_PORT 0x01
- .equ FS_ADDR_PORT 0x02
-
- jp init
-
- ; *** JUMP TABLE ***
- jp strncmp
- jp addDE
- jp addHL
- jp upcase
- jp unsetZ
- jp intoDE
- jp intoHL
- jp writeHLinDE
- jp findchar
- jp parseHex
- jp parseHexPair
- jp blkSel
- jp blkSet
- jp fsFindFN
- jp fsOpen
- jp fsGetC
- jp fsPutC
- jp fsSetSize
- jp cpHLDE
- jp parseArgs
- jp printstr
- jp _blkGetC
- jp _blkPutC
- jp _blkSeek
- jp _blkTell
- jp printcrlf
- jp stdioPutC
- jp stdioReadLine
-
- .inc "core.asm"
- .inc "err.h"
- .inc "parse.asm"
-
- .equ BLOCKDEV_RAMSTART RAMSTART
- .equ BLOCKDEV_COUNT 4
- .inc "blockdev.asm"
- ; List of devices
- .dw fsdevGetC, fsdevPutC
- .dw stdoutGetC, stdoutPutC
- .dw stdinGetC, stdinPutC
- .dw mmapGetC, mmapPutC
-
-
- .equ MMAP_START 0xe000
- .inc "mmap.asm"
-
- .equ STDIO_RAMSTART BLOCKDEV_RAMEND
- .inc "stdio.asm"
-
- .equ FS_RAMSTART STDIO_RAMEND
- .equ FS_HANDLE_COUNT 2
- .inc "fs.asm"
-
- .equ SHELL_RAMSTART FS_RAMEND
- .equ SHELL_EXTRA_CMD_COUNT 9
- .inc "shell.asm"
- .dw blkBselCmd, blkSeekCmd, blkLoadCmd, blkSaveCmd
- .dw fsOnCmd, flsCmd, fnewCmd, fdelCmd, fopnCmd
-
- .inc "blockdev_cmds.asm"
- .inc "fs_cmds.asm"
-
- .equ PGM_RAMSTART SHELL_RAMEND
- .equ PGM_CODEADDR USERCODE
- .inc "pgm.asm"
-
- ;.out PGM_RAMEND
-
- init:
- di
- ; setup stack
- ld hl, KERNEL_RAMEND
- ld sp, hl
- ld hl, emulGetC
- ld de, emulPutC
- call stdioInit
- call fsInit
- ld a, 0 ; select fsdev
- ld de, BLOCKDEV_SEL
- call blkSel
- call fsOn
- call shellInit
- ld hl, pgmShellHook
- ld (SHELL_CMDHOOK), hl
- jp shellLoop
-
- emulGetC:
- ; Blocks until a char is returned
- in a, (STDIO_PORT)
- cp a ; ensure Z
- ret
-
- emulPutC:
- out (STDIO_PORT), a
- ret
-
- fsdevGetC:
- ld a, e
- out (FS_ADDR_PORT), a
- ld a, h
- out (FS_ADDR_PORT), a
- ld a, l
- out (FS_ADDR_PORT), a
- in a, (FS_ADDR_PORT)
- or a
- ret nz
- in a, (FS_DATA_PORT)
- cp a ; ensure Z
- ret
-
- fsdevPutC:
- push af
- ld a, e
- out (FS_ADDR_PORT), a
- ld a, h
- out (FS_ADDR_PORT), a
- ld a, l
- out (FS_ADDR_PORT), a
- in a, (FS_ADDR_PORT)
- cp 2 ; only A > 1 means error
- jr nc, .error ; A >= 2
- pop af
- out (FS_DATA_PORT), a
- cp a ; ensure Z
- ret
- .error:
- pop af
- jp unsetZ ; returns
-
- .equ STDOUT_HANDLE FS_HANDLES
-
- stdoutGetC:
- ld ix, STDOUT_HANDLE
- jp fsGetC
-
- stdoutPutC:
- ld ix, STDOUT_HANDLE
- jp fsPutC
-
- .equ STDIN_HANDLE FS_HANDLES+FS_HANDLE_SIZE
-
- stdinGetC:
- ld ix, STDIN_HANDLE
- jp fsGetC
-
- stdinPutC:
- ld ix, STDIN_HANDLE
- jp fsPutC
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