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collapseos/tools/emul/shell/glue.asm

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; Last check:
; Kernel size: 0x619
; Kernel RAM usage: 0x66
; Shell size: 0x411
; Shell RAM usage: 0x11
.inc "blkdev.h"
.inc "fs.h"
.inc "err.h"
.inc "ascii.h"
.equ RAMSTART 0x4000
; 0x100 - 0x66 gives us a nice space for the stack.
.equ KERNEL_RAMEND 0x4100
.equ SHELL_CODE 0x0700
.equ STDIO_PORT 0x00
.equ FS_DATA_PORT 0x01
.equ FS_ADDR_PORT 0x02
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jp init
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; *** JUMP TABLE ***
jp strncmp
jp upcase
jp findchar
jp blkSelPtr
jp blkSel
jp blkSet
jp blkSeek
jp blkTell
jp blkGetB
jp blkPutB
jp fsFindFN
jp fsOpen
jp fsGetB
jp fsPutB
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jp fsSetSize
jp fsOn
jp fsIter
jp fsAlloc
jp fsDel
jp fsHandle
jp printstr
jp printnstr
jp _blkGetB
jp _blkPutB
jp _blkSeek
jp _blkTell
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jp printcrlf
jp stdioGetC
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jp stdioPutC
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jp stdioReadLine
.inc "core.asm"
.inc "str.asm"
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.equ BLOCKDEV_RAMSTART RAMSTART
.equ BLOCKDEV_COUNT 4
.inc "blockdev.asm"
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; List of devices
.dw fsdevGetB, fsdevPutB
.dw stdoutGetB, stdoutPutB
.dw stdinGetB, stdinPutB
.dw mmapGetB, mmapPutB
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.equ MMAP_START 0xe000
.inc "mmap.asm"
.equ STDIO_RAMSTART BLOCKDEV_RAMEND
.equ STDIO_GETC emulGetC
.equ STDIO_PUTC emulPutC
.inc "stdio.asm"
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.equ FS_RAMSTART STDIO_RAMEND
.equ FS_HANDLE_COUNT 2
.inc "fs.asm"
init:
di
; setup stack
ld sp, KERNEL_RAMEND
call fsInit
ld a, 0 ; select fsdev
ld de, BLOCKDEV_SEL
call blkSel
call fsOn
call SHELL_CODE
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emulGetC:
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; Blocks until a char is returned
in a, (STDIO_PORT)
cp a ; ensure Z
ret
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emulPutC:
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out (STDIO_PORT), a
ret
fsdevGetB:
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)
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cp a ; ensure Z
ret
fsdevPutB:
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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
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pop af
out (FS_DATA_PORT), a
cp a ; ensure Z
ret
.error:
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pop af
jp unsetZ ; returns
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.equ STDOUT_HANDLE FS_HANDLES
stdoutGetB:
ld ix, STDOUT_HANDLE
jp fsGetB
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stdoutPutB:
ld ix, STDOUT_HANDLE
jp fsPutB
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.equ STDIN_HANDLE FS_HANDLES+FS_HANDLE_SIZE
stdinGetB:
ld ix, STDIN_HANDLE
jp fsGetB
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stdinPutB:
ld ix, STDIN_HANDLE
jp fsPutB
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.fill SHELL_CODE-$
.bin "shell.bin"