51 lines
1.0 KiB
NASM
51 lines
1.0 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
|
||
|
|
|
||
|
|
|
||
|
|
.equ STDIO_RAMSTART RAMSTART
|
||
|
|
.equ STDIO_GETC emulGetC
|
||
|
|
.equ STDIO_PUTC emulPutC
|
||
|
|
.inc "stdio.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
|