mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-23 23:28:05 +11:00
a8e573c84a
Big one. This allows us to write higher order words directly in Forth, which is much more convenient than writing post-immediate (see "NOT" structure in diff if you want to see what I mean) structures in ASM. These structures can then be written to ROM (rather than loaded in RAM for definitions loaded at run-time). That's quite a bit of tooling that was added, 2 compilations stages, but I think it's well worth it.
57 lines
1.1 KiB
NASM
57 lines
1.1 KiB
NASM
; RAM disposition
|
|
;
|
|
; Because this glue code also serves stage0 which needs HERE to start right
|
|
; after the code, we have a peculiar RAM setup here: it lives at the very end
|
|
; of the address space, just under RS_ADDR at 0xf000
|
|
; Warning: The offsets of native dict entries must be exactly the same between
|
|
; glue0.asm and glue1.asm
|
|
.equ RAMSTART 0xe800
|
|
.equ HERE 0xe700 ; override, in sync with stage1.c
|
|
.equ CURRENT 0xe702 ; override, in sync with stage1.c
|
|
.equ HERE_INITIAL CODE_END ; override
|
|
|
|
.inc "ascii.h"
|
|
.equ STDIO_PORT 0x00
|
|
|
|
jp init
|
|
|
|
.inc "core.asm"
|
|
.inc "str.asm"
|
|
|
|
.equ STDIO_RAMSTART RAMSTART
|
|
.equ STDIO_GETC emulGetC
|
|
.equ STDIO_PUTC emulPutC
|
|
.inc "stdio.asm"
|
|
|
|
.inc "lib/util.asm"
|
|
.inc "lib/parse.asm"
|
|
.inc "lib/ari.asm"
|
|
.inc "lib/fmt.asm"
|
|
.equ FORTH_RAMSTART STDIO_RAMEND
|
|
.inc "forth/main.asm"
|
|
.inc "forth/util.asm"
|
|
.inc "forth/stack.asm"
|
|
.inc "forth/dict.asm"
|
|
|
|
|
|
init:
|
|
di
|
|
; setup stack
|
|
ld sp, 0xffff
|
|
call forthMain
|
|
halt
|
|
|
|
emulGetC:
|
|
; Blocks until a char is returned
|
|
in a, (STDIO_PORT)
|
|
cp a ; ensure Z
|
|
ret
|
|
|
|
emulPutC:
|
|
out (STDIO_PORT), a
|
|
ret
|
|
|
|
.dw 0 ; placeholder used in glue1.
|
|
CODE_END:
|
|
.out $ ; should be the same as in glue1
|