mirror of https://github.com/hsoft/collapseos.git
154 lines
2.2 KiB
NASM
154 lines
2.2 KiB
NASM
; Last check:
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; Kernel size: 0x619
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; Kernel RAM usage: 0x66
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; Shell size: 0x411
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; Shell RAM usage: 0x11
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.inc "blkdev.h"
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.inc "fs.h"
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.inc "err.h"
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.inc "ascii.h"
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.equ RAMSTART 0x4000
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; 0x100 - 0x66 gives us a nice space for the stack.
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.equ KERNEL_RAMEND 0x4100
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.equ SHELL_CODE 0x0700
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.equ STDIO_PORT 0x00
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.equ FS_DATA_PORT 0x01
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.equ FS_ADDR_PORT 0x02
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jp init
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; *** JUMP TABLE ***
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jp strncmp
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jp upcase
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jp findchar
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jp blkSelPtr
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jp blkSel
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jp blkSet
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jp blkSeek
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jp blkTell
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jp blkGetB
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jp blkPutB
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jp fsFindFN
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jp fsOpen
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jp fsGetB
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jp fsPutB
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jp fsSetSize
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jp fsOn
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jp fsIter
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jp fsAlloc
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jp fsDel
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jp fsHandle
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jp printstr
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jp printnstr
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jp _blkGetB
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jp _blkPutB
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jp _blkSeek
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jp _blkTell
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jp printcrlf
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jp stdioGetC
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jp stdioPutC
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jp stdioReadLine
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.inc "core.asm"
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.inc "str.asm"
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.equ BLOCKDEV_RAMSTART RAMSTART
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.equ BLOCKDEV_COUNT 4
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.inc "blockdev.asm"
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; List of devices
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.dw fsdevGetB, fsdevPutB
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.dw stdoutGetB, stdoutPutB
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.dw stdinGetB, stdinPutB
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.dw mmapGetB, mmapPutB
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.equ MMAP_START 0xe000
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.inc "mmap.asm"
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.equ STDIO_RAMSTART BLOCKDEV_RAMEND
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.equ STDIO_GETC emulGetC
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.equ STDIO_PUTC emulPutC
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.inc "stdio.asm"
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.equ FS_RAMSTART STDIO_RAMEND
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.equ FS_HANDLE_COUNT 2
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.inc "fs.asm"
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init:
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di
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; setup stack
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ld sp, KERNEL_RAMEND
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call fsInit
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ld a, 0 ; select fsdev
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ld de, BLOCKDEV_SEL
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call blkSel
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call fsOn
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call SHELL_CODE
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emulGetC:
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; Blocks until a char is returned
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in a, (STDIO_PORT)
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cp a ; ensure Z
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ret
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emulPutC:
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out (STDIO_PORT), a
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ret
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fsdevGetB:
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ld a, e
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out (FS_ADDR_PORT), a
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ld a, h
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out (FS_ADDR_PORT), a
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ld a, l
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out (FS_ADDR_PORT), a
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in a, (FS_ADDR_PORT)
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or a
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ret nz
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in a, (FS_DATA_PORT)
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cp a ; ensure Z
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ret
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fsdevPutB:
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push af
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ld a, e
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out (FS_ADDR_PORT), a
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ld a, h
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out (FS_ADDR_PORT), a
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ld a, l
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out (FS_ADDR_PORT), a
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in a, (FS_ADDR_PORT)
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cp 2 ; only A > 1 means error
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jr nc, .error ; A >= 2
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pop af
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out (FS_DATA_PORT), a
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cp a ; ensure Z
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ret
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.error:
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pop af
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jp unsetZ ; returns
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.equ STDOUT_HANDLE FS_HANDLES
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stdoutGetB:
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ld ix, STDOUT_HANDLE
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jp fsGetB
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stdoutPutB:
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ld ix, STDOUT_HANDLE
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jp fsPutB
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.equ STDIN_HANDLE FS_HANDLES+FS_HANDLE_SIZE
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stdinGetB:
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ld ix, STDIN_HANDLE
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jp fsGetB
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stdinPutB:
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ld ix, STDIN_HANDLE
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jp fsPutB
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.fill SHELL_CODE-$
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.bin "shell.bin"
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