wok-6.x annotate syslinux/stuff/iso2exe/bootiso.S @ rev 14261

syslinux/iso2exe: add NT+ support
author Pascal Bellard <pascal.bellard@slitaz.org>
date Sat Mar 30 18:36:46 2013 +0100 (2013-03-30)
parents 65b3fd0022ed
children ada914860f33
rev   line source
pascal@13691 1 .text
pascal@13691 2 .code16
pascal@13691 3 .org 0
pascal@13691 4
pascal@13691 5 CODESZ = 0x8000 // 16 sectors = 32Kb
pascal@13972 6 #define EXEADRS(x) x+0xC0
pascal@14261 7 #define EXELOC(x) x-0x40
pascal@14261 8 #define EXESTR(x) x-0x7F40
pascal@13691 9
pascal@13691 10 .globl _start
pascal@13691 11 _start:
pascal@13691 12 decw %bp // Magic number: MZ
pascal@13691 13 popw %dx
pascal@13972 14 jmp start0 // Bytes on last page of file
pascal@13691 15 .word (CODESZ+511)/512 // Pages in file
pascal@13691 16 .word 0 // Relocations
pascal@13691 17 .word (end_header-_start)/16 // Size of header in paragraphs
pascal@13691 18 .word 4064-(CODESZ/16) // Minimum extra paragraphs needed
pascal@13691 19 .word 4064-(CODESZ/16) // Maximum extra paragraphs needed
pascal@13691 20 .word 0xFFF0 // Initial (relative) SS value
pascal@13691 21 .word 0xFFFE // Initial SP value
pascal@13691 22 .word 0 // Checksum
pascal@13729 23 .word EXEADRS(exestart) // Initial IP value
pascal@13691 24 .word 0xFFF0 // Initial (relative) CS value
pascal@13972 25 initramfssize:
pascal@13972 26 .word 0 // File address of relocation table
pascal@13972 27 id:
pascal@13691 28 .word 0 // Overlay number
pascal@14257 29 fdcnt:
pascal@14257 30 .byte 0 // Bootstrap floppy sector count
pascal@13691 31
pascal@13691 32 /////////////////////// Master Boot Record code //////////////////////////////
pascal@13691 33
pascal@13972 34 start0: // File address of relocation table
pascal@13691 35 pushw %dx // restore SP
pascal@13972 36 incw %bp // restore %bp
pascal@13713 37 pushw $0
pascal@13713 38 popw %ds
pascal@13713 39 movw $0x7C00, %bx
pascal@13713 40 pushfw
pascal@13713 41 pushw %ds
pascal@13713 42 pushw %bx
pascal@13691 43 pushaw
pascal@13691 44 movw %sp, %bp
pascal@13691 45 pushw %es
pascal@13972 46 cld
pascal@13972 47 pushw %ds
pascal@13972 48 popw %es
pascal@13691 49 call setreg
pascal@13691 50 rep
pascal@13691 51 movsw
pascal@13972 52 movw $0x80, %dx
pascal@13691 53 ljmp $0, $0x0600+start2
pascal@13972 54
pascal@13972 55 .org 60
pascal@14261 56 .long 0x0080 // PE header offset
pascal@13972 57 end_header:
pascal@13972 58 chksum:
pascal@13972 59 .word 0
pascal@13972 60 comstart:
pascal@13972 61 .word 0
pascal@13691 62
pascal@14261 63 readsectorX:
pascal@14261 64 movb $0, %cl
pascal@13699 65 readsector1:
pascal@13699 66 movw %cx, (%bx)
pascal@13699 67 incw %cx
pascal@13699 68 movw $0x201, %ax
pascal@13699 69 int $0x13
pascal@13691 70 setreg:
pascal@13699 71 movw %bx, %si
pascal@13691 72 movw $0x0600, %di
pascal@13691 73 movw $0x0100, %cx
pascal@13691 74 return:
pascal@13691 75 ret
pascal@13691 76 start2:
pascal@13691 77 dxloop:
pascal@13699 78 call readsector1
pascal@13691 79 repe
pascal@13691 80 cmpsw
pascal@13691 81 je dxfound
pascal@13691 82 next:
pascal@13699 83 xorw %cx, %cx
pascal@13699 84 xchgw %ax, %dx
pascal@13699 85 addb $0x7D, %al // try every hard disk
pascal@13699 86 andb $0x83, %al // and floppy disk
pascal@13699 87 cmpb $0x80, %al
pascal@13699 88 xchgw %ax, %dx
pascal@13691 89 jnz dxloop
pascal@13691 90 fail:
pascal@14261 91 // movw $0x0600+noloader, %si
pascal@14261 92 // call putslp
pascal@13713 93 stop:
pascal@13713 94 hlt
pascal@13713 95 jmp stop
pascal@13691 96 dxfound:
pascal@13691 97 movw %dx, 10(%bp)
pascal@14261 98 call readsectorX
pascal@13699 99 lodsw
pascal@13713 100 shrw $1, %ax
pascal@13699 101 jz fail // read fail or not isohydrid
pascal@13691 102 popw %es
pascal@13691 103 popa
pascal@13713 104 iret
pascal@13691 105
pascal@14261 106 .org 0x0080
pascal@14261 107 ////////////////////////////// EXE/PE header //////////////////////////////////
pascal@14261 108
pascal@14261 109 .org 0x7EE0
pascal@13691 110 ////////////////////////////// DOS EXE code ///////////////////////////////////
pascal@13691 111
pascal@13729 112 exestart:
pascal@13699 113 cld
pascal@13697 114 movw $0x100, %si
pascal@13713 115 movw -127(%si), %ax
pascal@13729 116 cwd // clear dx
pascal@13713 117 pushw %dx // dos exit
pascal@13713 118 cmpw $0x2F20, %ax
pascal@13729 119 movw $0x1000+EXESTR(help), %ax
pascal@13691 120 je abort
pascal@13729 121 pushfw // save flags
pascal@13729 122 // bits 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
pascal@13729 123 // flags 0 NT IOPL OF DF IF TF SF ZF 0 AF 0 PF 1 CF
pascal@13729 124 // movb $0x10, %ah
pascal@13729 125 pushw %ax
pascal@13729 126 popfw // < 286 : flags[12..15] are forced 1
pascal@13729 127 pushfw // = 286 : flags[12..15] are forced 0
pascal@13729 128 popw %cx // > 286 : only flags[15] is forced 0
pascal@13729 129 popfw // restore flags
pascal@13729 130 addb %ah, %ch // test F0 and 00 cases
pascal@13729 131 cmpb %ah, %ch
pascal@13729 132 movb $EXESTR(no386), %al
pascal@13729 133 jbe abort // C=8086/80186, Z=80286
pascal@13729 134 #if 1
pascal@13697 135 movw (%si), %cx
pascal@13729 136 jcxz is386
pascal@13729 137 #endif
pascal@14261 138 movw $(EXELOC(0x8000))/2, %cx
pascal@13697 139 chklp:
pascal@13697 140 lodsw
pascal@13697 141 addw %ax, %dx
pascal@13697 142 loop chklp
pascal@13713 143 movb $EXESTR(chkerr), %al
pascal@13729 144 je is386 // dx == 0 ?
pascal@13691 145 abort:
pascal@13691 146 puts:
pascal@14261 147 movb $0x80, %ah
pascal@13713 148 xchgw %ax, %si
pascal@13713 149 putslp:
pascal@13713 150 lodsb
pascal@13713 151 orb %al, %al
pascal@13713 152 jz moveret
pascal@13713 153 js puts
pascal@13713 154 movw $7, %bx
pascal@13713 155 movb $0xE, %ah
pascal@13713 156 int $0x10
pascal@13713 157 jmp putslp
pascal@13691 158
pascal@13691 159 is386:
pascal@13697 160 movl %cr0, %eax
pascal@13691 161 andb $1, %al
pascal@13691 162 jne tstvcpi
pascal@14150 163 incl %eax
pascal@13713 164 movb $EXESTR(rmPaging), %al
pascal@14150 165 js abort
pascal@13713 166 movb $EXESTR(realmodemsg), %al
pascal@13691 167 realmode:
pascal@13691 168 call puts
pascal@13699 169 movb $0x30, %ah
pascal@13699 170 int $0x21
pascal@13699 171 cmpb $3, %al
pascal@13713 172 movb $EXESTR(noDOS3), %al
pascal@13713 173 jb abort
pascal@13691 174 movw $0x0100, %di
pascal@14261 175 movw comstart-end_header(%di), %si // .com address
pascal@13691 176 pushw %di
pascal@14261 177 movb $0x7D, %ch
pascal@13691 178 rep
pascal@13691 179 movsb
pascal@13713 180 moveret:
pascal@13691 181 ret
pascal@13713 182
pascal@13713 183 VersionVCPI:
pascal@13713 184 cmpb $0x40, %dl // >= 4.0 ?
pascal@13713 185 jb NoVCPI
pascal@13713 186 movb $EXESTR(vm86modemsg), %al
pascal@13713 187 jmp realmode
pascal@13713 188 tstvcpi:
pascal@13713 189 pushw %ds
pascal@13713 190 movw %cx, %ds // %cx = 0
pascal@13713 191 movw 0x67*4+2, %ds
pascal@13713 192 movw $10, %si
pascal@14150 193 lodsl
pascal@13713 194 xorw $0x4D45, %ax // EM(MX) or EM(MQ)
pascal@14150 195 lodsl
pascal@13713 196 popw %ds
pascal@14150 197 jne NoVCPI
pascal@14150 198 xorl $0x30585858, %eax // XXX0
pascal@13713 199 movw $EXEADRS(CmdVCPI), %si
pascal@13713 200 ChkVCPI:
pascal@13713 201 NoVCPI:
pascal@13713 202 movb $EXESTR(ERRvcpi), %al
pascal@13713 203 jne abort
pascal@13713 204 lodsb
pascal@13713 205 shlw $8, %ax
pascal@13713 206 je VersionVCPI
pascal@13713 207 int $0x67
pascal@13713 208 testb %ah, %ah
pascal@14150 209 xchgw %ax, %dx
pascal@13713 210 jmp ChkVCPI
pascal@13713 211 CmdVCPI:
pascal@13713 212 .byte 0x40 // status
pascal@13713 213 .byte 0xDE // vcpi present ?
pascal@13713 214 .byte 0x46 // version
pascal@13713 215 .byte 0
pascal@13713 216
pascal@14261 217 // -------------------------------------------------------------------
pascal@13691 218
pascal@14261 219 help:
pascal@14261 220 .ascii "SliTaz GNU/L" // SliTaz GNU/Linux boot loader
pascal@14261 221 .byte EXESTR(iloader)
pascal@14261 222 no386:
pascal@14261 223 .ascii "No 386" // No 386+
pascal@14261 224 .byte EXESTR(plus)
pascal@14261 225 ERRvcpi:
pascal@14261 226 .ascii "No EMM386/VCPI 4" // No EMM386/VCPI 4.0+
pascal@14261 227 .byte EXESTR(dot0)
pascal@14261 228 chkerr:
pascal@14261 229 .ascii "Broken ISO image fil" // Broken ISO image file.
pascal@14261 230 .byte EXESTR(eeol)
pascal@14261 231 vm86modemsg:
pascal@14261 232 .ascii "vm86" // vm86 mode.
pascal@14261 233 .byte EXESTR(mode)
pascal@14261 234 rmPaging:
pascal@14261 235 .ascii "Invalid: paging + " // Invalid: paging + real mode.
pascal@14261 236 realmodemsg:
pascal@14261 237 .ascii "real" // real mode.
pascal@14261 238 // --------------- Must be in 00C0 013F range ------------------------
pascal@14261 239 mode:
pascal@14261 240 .ascii " mod"
pascal@14261 241 eeol:
pascal@14261 242 .ascii "e"
pascal@14261 243 .byte EXESTR(eol)
pascal@14261 244 //noloader:
pascal@14261 245 // .ascii "No isol" // No isolinux boot loader
pascal@14261 246 iloader:
pascal@14261 247 .ascii "inux boot loader"
pascal@14261 248 eol:
pascal@14261 249 .ascii "."
pascal@14261 250 eol2:
pascal@14261 251 .asciz "\r\n"
pascal@14261 252 noDOS3:
pascal@14261 253 .ascii "No DOS 3" // No DOS 3.0+
pascal@14261 254 dot0:
pascal@14261 255 .ascii ".0"
pascal@14261 256 plus:
pascal@14261 257 .ascii "+"
pascal@14261 258 .byte EXESTR(eol2)
pascal@14261 259
pascal@14261 260 .org 0x8000
pascal@14261 261 ////////////////////////// ISO9660 header /////////////////////////////////////
pascal@14261 262