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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
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;
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; Because this glue code also serves stage0 which needs HERE to start right
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; after the code, we have a peculiar RAM setup here: it lives at the very end
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; of the address space, just under RS_ADDR at 0xf000
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; Warning: The offsets of native dict entries must be exactly the same between
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; glue0.asm and glue1.asm
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.equ RAMSTART 0xe800
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.equ HERE 0xe700 ; override, in sync with stage1.c
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.equ CURRENT 0xe702 ; override, in sync with stage1.c
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.equ HERE_INITIAL CODE_END ; override
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.inc "ascii.h"
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.equ STDIO_PORT 0x00
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jp init
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.inc "core.asm"
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.inc "str.asm"
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.equ STDIO_RAMSTART RAMSTART
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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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.inc "lib/util.asm"
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.inc "lib/parse.asm"
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.inc "lib/ari.asm"
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.inc "lib/fmt.asm"
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.equ FORTH_RAMSTART STDIO_RAMEND
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.inc "forth/main.asm"
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.inc "forth/util.asm"
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.inc "forth/stack.asm"
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.inc "forth/dict.asm"
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init:
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di
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; setup stack
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ld sp, 0xffff
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call forthMain
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halt
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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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.dw 0 ; placeholder used in glue1.
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CODE_END:
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.out $ ; should be the same as in glue1
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