From 8f5f932098be4cec3de5fb95cfa7efdaa2794efb Mon Sep 17 00:00:00 2001
From: Peter Ferrie <peter.ferrie@gmail.com>
Date: Sun, 7 Nov 2021 21:24:36 -0800
Subject: [PATCH] shave another six bytes

---
 bin/sectorlisp.bin | Bin 512 -> 512 bytes
 sectorlisp.S       |  43 ++++++++++++++++++++-----------------------
 2 files changed, 20 insertions(+), 23 deletions(-)

diff --git a/bin/sectorlisp.bin b/bin/sectorlisp.bin
index cd664257a32b0f41ed4140a858990b36666995af..dd5829315356e6344458814eb29fbba5cad432de 100755
GIT binary patch
delta 402
zcmXAjO(;ZB6vywoW}5Qxgd&AuAzm3JQZIK_$U<roMi!=6uvG3dHkcaZb){z1yrt}>
z8R}&t3z>Rb`PhgRqvV)}@lhJmTz9fKr&GWG#|b$?jv~7SMR4;9%Cw`D>j;Im(j6)N
z{P!~<%d*>5qn{qT&_OX&BA7vX1|$hQ$Si|(WIvstMLoZ9K^hluA_8+LDy}!8EI30y
zO7L;R8?hjOjJRY_`7*2L_f}JM5QdQbWwvq+GcVloaTRE(P*j+W^x6D|Gj1w&8)>C9
za@@V5W@)uh?(;6@jX@Kd4EP|!V*$G+Y6(_XNO2AWK@$SJ2w-eJCSyslx9$uJJe(*r
z2+Q0DAKXr}CG2P3f}unhMDeS5VH(9HZPsAUaIQ)Ss6U)@(`z5>@Ywj2Kn=#f4d!_?
zU|%wdSr_T0hMLzJ%yKK78w%DkLOQ9N^pyAYV_HlU?Pe{j-RoeD4Z|*<n6wW?26I|$
e1gjbSiaxM9)up|&0c>rjrTXnRNfzV4qlrI4zQ5Z5

delta 406
zcmXAjF-RLx7{|Z&^bp0wp-?RZ4NAZi9SSN4?>5CnB#2s@!8jGf#lpK&L@{te4Nrtb
zxSMoxkf?BoLv*mh4K6J-OG~GwIQZGuQmN2hMe_QB%f}ynzyF^vTc53`GLf%KtbOmX
zXCWGmb~Kz*d+LQcO~Aw5-mBK!`w|RnRql$%P51<G4$cUmL9iG62)+f0?_eoc-T27j
zHZA7y4HR^`Wl7t}-X|BYH_Uv1v*7I$k4MYDa@E823qFctApiK?%A&%=uWH%}TM2L0
zjvwdJ|A!xxpOihUo7?%)z?!27f2!Rh)hA3BJ7Ff1!W-pgWLqJq!B}m`7)KM*n*7kj
z+q^z-5A@xtcmY0FEXkK~MWyh!lHbHCeJRXZp;;H4kno@Sjn}YGta(ouP8iV!Pdni=
z{yBv^bIP68sNH+);esk;WLa=3`k2Yx!KxMa8v`dCS&RwBdU+@7Zy6e<Ji@xHFMlry
rSd|iiU}_w9ReDCA=ow)IVuCvNB=?D5iP&I+bt^__uw5oybh7v#-KW2K

diff --git a/sectorlisp.S b/sectorlisp.S
index af5be88..e8ab8b5 100644
--- a/sectorlisp.S
+++ b/sectorlisp.S
@@ -3,6 +3,7 @@
 ╞══════════════════════════════════════════════════════════════════════════════╡
 │ 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         │
@@ -21,19 +22,19 @@
 // LISP meta-circular evaluator in a MBR
 
 .set ONE,		%bp
-.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 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 g_token,	0x7800
 .set g_str,	0x0
-.set g_mem,	0x3600
+.set g_mem,	0x8000
 .set boot,	0x7c00
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -48,27 +49,23 @@
 _start:	jmp	.init				# some bios scan for short jump
 .type kSymbols,@object;
 kSymbols:
-	.ascii "NIL\0T\0QUOTE\0COND\0ATOM\0CAR\0CDR\0CONS\0EQ"
+	.ascii "\0NIL\0T\0QUOTE\0COND\0ATOM\0CAR\0CDR\0CONS\0EQ\0"
 
 .type .init,@function
-.init:	ljmp	$0x600>>4,$_begin		# end of bios data roundup page
-_begin:	push	%cs				# memory model cs=ds=es = 0x600
+.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
 	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