SliTaz Repositories

     1.1 --- a/memtest/stuff/bootloader.S	Mon Nov 11 07:22:44 2013 +0000
     1.2 +++ b/memtest/stuff/bootloader.S	Sun Apr 19 16:50:55 2015 -0400
     1.3 @@ -2,9 +2,6 @@
     1.4  INITSEG		= 0x9000
     1.5  SETUPSEG	= 0x9020
     1.6  
     1.7 -setup_sects	= 497
     1.8 -syssize		= 500
     1.9 -
    1.10  	.text
    1.11  	.code16
    1.12  	.org	0
    1.13 @@ -82,7 +79,6 @@
    1.14  #ifdef CHECK_REALMODE
    1.15  #define PUTS
    1.16  	movw	$EXEADRS(realmode_expected), %si
    1.17 -	pushfw			// save flags
    1.18  		// bits  15 14 13 12 11 10  9  8  7  6  5  4  3  2  1  0
    1.19  		// flags  0 NT  IOPL OF DF IF TF SF ZF  0 AF  0 PF  1 CF
    1.20  	//movb	$0x10, %ah	// DF = IF = TF = 0
    1.21 @@ -90,18 +86,23 @@
    1.22  	popfw			// < 286 : flags[12..15] are forced 1
    1.23  	pushfw			// = 286 : flags[12..15] are forced 0
    1.24  	popw	%dx		// > 286 : only flags[15] is forced 0
    1.25 -	popfw			// restore flags
    1.26  	cmpb	%ah, %dh	// test Fx and 0x cases
    1.27  jsputs:
    1.28  	js	puts		// S= not 386+
    1.29  	smsww	%dx
    1.30  	shrw	$1, %dx
    1.31  	jc	puts
    1.32 +	//movw	syssize-realmode_expected(%si), %bp
    1.33 +	.byte	0x8B, 0x6C, syssize-realmode_expected
    1.34 +	//movb	setup_sects-realmode_expected(%si), %ch
    1.35 +	.byte	0x8A, 0x6C, setup_sects-realmode_expected
    1.36 +#else
    1.37 +	movw	EXEADRS(syssize), %bp
    1.38 +	movb	EXEADRS(setup_sects), %ch
    1.39  #endif
    1.40 +	movb	$(512-(end_header-_start))/2, %cl
    1.41  	movw	$0x100, %si
    1.42  	movw	$end_header, %di
    1.43 -	movb	EXEADRS(setup_sects), %ch
    1.44 -	movb	$(512-(end_header-_start))/2, %cl
    1.45  	rep
    1.46  	  movsw
    1.47  	ljmp	$INITSEG, $movesys
    1.48 @@ -174,8 +175,9 @@
    1.49  
    1.50  	popw	%bx			# clear %bx
    1.51  	movw	syssize, %di
    1.52 -	addw	$(512/16)-1, %di
    1.53 +	decw	%di
    1.54  	shrw	$9-4, %di
    1.55 +	incw	%di
    1.56  	movw	$SYSSEG, %cx
    1.57  	call	read_sectorsCX
    1.58  
    1.59 @@ -205,29 +207,27 @@
    1.60  	int	$0x20			// dos exit
    1.61  #endif
    1.62  #ifdef EXE_SUPPORT
    1.63 -movesys:
    1.64 +movesys:				// %ax = SYSSEG
    1.65  	pushw	%es
    1.66  	popw	%ss
    1.67 -	movw	EXEADRS(syssize), %bp	// %ds untouched
    1.68  	movw	%ds, %bx
    1.69 -	cwd
    1.70 -	incw	%dx
    1.71 -	cmpw	%ax, %bx
    1.72 +	subw	%ax, %bx
    1.73  	jnc	forward
    1.74 -	negw	%dx
    1.75  	addw	%bp, %ax
    1.76 -	addw	%bp, %bx
    1.77  forward:
    1.78  	movw	%ax, %es
    1.79 -	movw	%bx, %ds
    1.80 +	movw	%ax, %dx
    1.81 +	addw	%bx, %dx
    1.82 +	movw	%dx, %ds
    1.83 +	sbbw	%dx, %dx		// %dx = 0 : -1
    1.84 +	cmc				//  C  = 1 :  0
    1.85 +	adcw	%dx, %ax
    1.86  	xorw	%di, %di
    1.87  	movb	$8, %cl
    1.88  	pushw	%si
    1.89  	rep
    1.90  	  movsw
    1.91  	popw	%si
    1.92 -	addw	%dx, %ax
    1.93 -	addw	%dx, %bx
    1.94  	decw	%bp
    1.95  	jns	forward
    1.96  #ifndef NO_CURSOR_DEFINITION
    1.97 @@ -380,15 +380,23 @@
    1.98  bdendlp:
    1.99          jmp	read_sectorslp
   1.100  
   1.101 -#ifdef CHECK_REALMODE
   1.102 -realmode_expected:
   1.103 -	.ascii	"386+ real mode only."
   1.104 -	.byte	13,10,0
   1.105 -#endif
   1.106  #ifdef HELP
   1.107  helpmsg:
   1.108  	.ascii	"No help available."
   1.109  	.byte	13,10
   1.110  	.byte	0
   1.111  #endif
   1.112 +#ifdef CHECK_REALMODE
   1.113 +	.org	475
   1.114 +realmode_expected:
   1.115 +helpend:
   1.116 +	.ascii	"386 real mode only."
   1.117 +	.byte	13,10,0
   1.118 +#endif
   1.119  	.org	497
   1.120 +setup_sects:
   1.121 +	.byte	0
   1.122 +	.org	500
   1.123 +syssize:
   1.124 +	.word	0
   1.125 +