|
|
@@ -3,7 +3,6 @@
|
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
|
│ Copyright 2021 Alain Greppin │
|
|
|
-│ Some size optimisations by Peter Ferrie │
|
|
|
│ │
|
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
|
@@ -22,19 +21,19 @@
|
|
|
// LISP meta-circular evaluator in a MBR
|
|
|
|
|
|
.set ONE, %bp
|
|
|
-.set NIL, 7
|
|
|
-.set ATOM_T, 15
|
|
|
-.set ATOM_QUOTE, 19
|
|
|
-.set ATOM_COND, 31
|
|
|
-.set ATOM_ATOM, 41
|
|
|
-.set ATOM_CAR, 51
|
|
|
-.set ATOM_CDR, 59
|
|
|
-.set ATOM_CONS, 67
|
|
|
-.set ATOM_EQ, 77
|
|
|
+.set NIL, 1
|
|
|
+.set ATOM_T, 9
|
|
|
+.set ATOM_QUOTE, 13
|
|
|
+.set ATOM_COND, 25
|
|
|
+.set ATOM_ATOM, 35
|
|
|
+.set ATOM_CAR, 45
|
|
|
+.set ATOM_CDR, 53
|
|
|
+.set ATOM_CONS, 61
|
|
|
+.set ATOM_EQ, 71
|
|
|
|
|
|
.set g_token, 0x7800
|
|
|
.set g_str, 0x0
|
|
|
-.set g_mem, 0x8000
|
|
|
+.set g_mem, 0x3600
|
|
|
.set boot, 0x7c00
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
@@ -49,23 +48,27 @@
|
|
|
_start: jmp .init # some bios scan for short jump
|
|
|
.type kSymbols,@object;
|
|
|
kSymbols:
|
|
|
- .ascii "\0NIL\0T\0QUOTE\0COND\0ATOM\0CAR\0CDR\0CONS\0EQ\0"
|
|
|
+ .ascii "NIL\0T\0QUOTE\0COND\0ATOM\0CAR\0CDR\0CONS\0EQ"
|
|
|
|
|
|
.type .init,@function
|
|
|
-.init: ljmp $0x7c00>>4,$_begin # end of bios data roundup page
|
|
|
-_begin: mov $g_mem,%cx
|
|
|
- mov %cx,%fs # fs = &g_mem
|
|
|
- xor %ax,%ax
|
|
|
- mov %cx,%di
|
|
|
- cld
|
|
|
- rep stosb # clears our bss memory
|
|
|
- push %cs # memory model cs=ds=es = 0x7c0
|
|
|
+.init: ljmp $0x600>>4,$_begin # end of bios data roundup page
|
|
|
+_begin: push %cs # memory model cs=ds=es = 0x600
|
|
|
push %cs
|
|
|
push %cs
|
|
|
pop %ds
|
|
|
pop %es
|
|
|
+ mov $kSymbols,%si
|
|
|
+ push %si
|
|
|
+ xor %di,%di # mov g_str, %di
|
|
|
+ mov $37,%cx
|
|
|
+ cld
|
|
|
+ rep movsb
|
|
|
+ pop %cx
|
|
|
pop %ss
|
|
|
mov %cx,%sp
|
|
|
+ mov $g_mem,%ax
|
|
|
+ mov %ax,%fs # fs = &g_mem
|
|
|
+ rep stosb # clears our bss memory
|
|
|
mov $NIL,ONE
|
|
|
main: mov $'\n',%dl
|
|
|
call GetToken
|
Peter Ferrie