549cf74e9d
Forth-ification of Collapse OS goes forward. What will happen is that assembly code in apps/ will become Forth code. The concept of an assembler code library will become obsolete. However, Forth's core use some of that code. To facilitate the transition, I'm inlining that code directly in Forth's code.
53 lines
1.1 KiB
NASM
53 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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.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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