mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-24 10:18:05 +11:00
019d05f64c
That's my mega-commit you've all been waiting for. The code for the shell share more routines with userspace apps than with kernel units, because, well, its behavior is that of a userspace app, not a device driver. This created a weird situation with libraries and jump tables. Some routine belonging to the `kernel/` directory felt weird there. And then comes `apps/basic`, which will likely share even more code with the shell. I was seeing myself creating huge jump tables to reuse code from the shell. It didn't feel right. Moreover, we'll probably want basic-like apps to optionnally replace the shell. So here I am with this huge change in the project structure. I didn't test all recipes on hardware yet, I will do later. I might have broken some... But now, the structure feels better and the line between what belongs to `kernel` and what belongs to `apps` feels clearer.
154 lines
2.2 KiB
NASM
154 lines
2.2 KiB
NASM
; 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
|
|
|
|
jp init
|
|
|
|
; *** 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
|
|
jp fsSetSize
|
|
jp fsOn
|
|
jp fsIter
|
|
jp fsAlloc
|
|
jp fsDel
|
|
jp fsHandle
|
|
jp printstr
|
|
jp printnstr
|
|
jp _blkGetB
|
|
jp _blkPutB
|
|
jp _blkSeek
|
|
jp _blkTell
|
|
jp printcrlf
|
|
jp stdioGetC
|
|
jp stdioPutC
|
|
jp stdioReadLine
|
|
|
|
.inc "core.asm"
|
|
.inc "str.asm"
|
|
|
|
.equ BLOCKDEV_RAMSTART RAMSTART
|
|
.equ BLOCKDEV_COUNT 4
|
|
.inc "blockdev.asm"
|
|
; List of devices
|
|
.dw fsdevGetB, fsdevPutB
|
|
.dw stdoutGetB, stdoutPutB
|
|
.dw stdinGetB, stdinPutB
|
|
.dw mmapGetB, mmapPutB
|
|
|
|
|
|
.equ MMAP_START 0xe000
|
|
.inc "mmap.asm"
|
|
|
|
.equ STDIO_RAMSTART BLOCKDEV_RAMEND
|
|
.equ STDIO_GETC emulGetC
|
|
.equ STDIO_PUTC emulPutC
|
|
.inc "stdio.asm"
|
|
|
|
.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
|
|
|
|
emulGetC:
|
|
; Blocks until a char is returned
|
|
in a, (STDIO_PORT)
|
|
cp a ; ensure Z
|
|
ret
|
|
|
|
emulPutC:
|
|
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)
|
|
cp a ; ensure Z
|
|
ret
|
|
|
|
fsdevPutB:
|
|
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
|
|
|
|
stdoutGetB:
|
|
ld ix, STDOUT_HANDLE
|
|
jp fsGetB
|
|
|
|
stdoutPutB:
|
|
ld ix, STDOUT_HANDLE
|
|
jp fsPutB
|
|
|
|
.equ STDIN_HANDLE FS_HANDLES+FS_HANDLE_SIZE
|
|
|
|
stdinGetB:
|
|
ld ix, STDIN_HANDLE
|
|
jp fsGetB
|
|
|
|
stdinPutB:
|
|
ld ix, STDIN_HANDLE
|
|
jp fsPutB
|
|
|
|
.fill SHELL_CODE-$
|
|
.bin "shell.bin"
|