wok annotate syslinux/stuff/iso2exe/bootiso.S @ rev 14320

syslinux/iso2exe: tiny typo
author Paul Issott <paul@slitaz.org>
date Sun Apr 07 20:27:24 2013 +0100 (2013-04-07)
parents 5ed4d6b2d690
children 3e7ad70145ce
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 dxfound:
pascal@13691 91 movw %dx, 10(%bp)
pascal@14267 92 call checkboot
pascal@14267 93 noboot:
pascal@14267 94 .ascii "No isolinux mbr."
pascal@14267 95 noboot_end:
pascal@14267 96
pascal@14267 97 .org 0x0080
pascal@14267 98 ////////////////////////////// EXE/PE header //////////////////////////////////
pascal@14267 99
pascal@14267 100 .org 0x01A0
pascal@14267 101 checkboot:
pascal@14261 102 call readsectorX
pascal@13699 103 lodsw
pascal@14267 104 popw %si
pascal@13713 105 shrw $1, %ax
pascal@14267 106 jz error // read fail or not isohydrid
pascal@13691 107 popw %es
pascal@13691 108 popa
pascal@13713 109 iret
pascal@13691 110
pascal@14267 111 error:
pascal@14267 112 movw $noboot_end-noboot, %cx
pascal@14267 113 putsloop:
pascal@14267 114 lodsb
pascal@14267 115 movw $7, %bx
pascal@14267 116 movb $0xE, %ah
pascal@14267 117 int $0x10
pascal@14267 118 loop putsloop
pascal@14267 119 halt:
pascal@14267 120 hlt
pascal@14267 121 jmp halt
pascal@14267 122 .org 0x01BE
pascal@14261 123
pascal@14261 124 .org 0x7EE0
pascal@13691 125 ////////////////////////////// DOS EXE code ///////////////////////////////////
pascal@13691 126
pascal@13729 127 exestart:
pascal@13699 128 cld
pascal@13697 129 movw $0x100, %si
pascal@13713 130 movw -127(%si), %ax
pascal@13729 131 cwd // clear dx
pascal@13713 132 pushw %dx // dos exit
pascal@13713 133 cmpw $0x2F20, %ax
pascal@13729 134 movw $0x1000+EXESTR(help), %ax
pascal@13691 135 je abort
pascal@13729 136 pushfw // save flags
pascal@13729 137 // bits 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
pascal@13729 138 // flags 0 NT IOPL OF DF IF TF SF ZF 0 AF 0 PF 1 CF
pascal@13729 139 // movb $0x10, %ah
pascal@13729 140 pushw %ax
pascal@13729 141 popfw // < 286 : flags[12..15] are forced 1
pascal@13729 142 pushfw // = 286 : flags[12..15] are forced 0
pascal@13729 143 popw %cx // > 286 : only flags[15] is forced 0
pascal@13729 144 popfw // restore flags
pascal@13729 145 addb %ah, %ch // test F0 and 00 cases
pascal@13729 146 cmpb %ah, %ch
pascal@13729 147 movb $EXESTR(no386), %al
pascal@13729 148 jbe abort // C=8086/80186, Z=80286
pascal@13729 149 #if 1
pascal@13697 150 movw (%si), %cx
pascal@13729 151 jcxz is386
pascal@13729 152 #endif
pascal@14261 153 movw $(EXELOC(0x8000))/2, %cx
pascal@13697 154 chklp:
pascal@13697 155 lodsw
pascal@13697 156 addw %ax, %dx
pascal@13697 157 loop chklp
pascal@13713 158 movb $EXESTR(chkerr), %al
pascal@13729 159 je is386 // dx == 0 ?
pascal@13691 160 abort:
pascal@13691 161 puts:
pascal@14261 162 movb $0x80, %ah
pascal@13713 163 xchgw %ax, %si
pascal@13713 164 putslp:
pascal@13713 165 lodsb
pascal@13713 166 orb %al, %al
pascal@13713 167 jz moveret
pascal@13713 168 js puts
pascal@13713 169 movw $7, %bx
pascal@13713 170 movb $0xE, %ah
pascal@13713 171 int $0x10
pascal@13713 172 jmp putslp
pascal@13691 173
pascal@13691 174 is386:
pascal@13697 175 movl %cr0, %eax
pascal@13691 176 andb $1, %al
pascal@13691 177 jne tstvcpi
pascal@14150 178 incl %eax
pascal@13713 179 movb $EXESTR(rmPaging), %al
pascal@14150 180 js abort
pascal@13713 181 movb $EXESTR(realmodemsg), %al
pascal@13691 182 realmode:
pascal@13691 183 call puts
pascal@13699 184 movb $0x30, %ah
pascal@13699 185 int $0x21
pascal@13699 186 cmpb $3, %al
pascal@13713 187 movb $EXESTR(noDOS3), %al
pascal@13713 188 jb abort
pascal@13691 189 movw $0x0100, %di
pascal@14261 190 movw comstart-end_header(%di), %si // .com address
pascal@13691 191 pushw %di
pascal@14261 192 movb $0x7D, %ch
pascal@13691 193 rep
pascal@13691 194 movsb
pascal@13713 195 moveret:
pascal@13691 196 ret
pascal@13713 197
pascal@13713 198 VersionVCPI:
pascal@13713 199 cmpb $0x40, %dl // >= 4.0 ?
pascal@13713 200 jb NoVCPI
pascal@13713 201 movb $EXESTR(vm86modemsg), %al
pascal@13713 202 jmp realmode
pascal@13713 203 tstvcpi:
pascal@13713 204 pushw %ds
pascal@13713 205 movw %cx, %ds // %cx = 0
pascal@13713 206 movw 0x67*4+2, %ds
pascal@13713 207 movw $10, %si
pascal@14150 208 lodsl
pascal@13713 209 xorw $0x4D45, %ax // EM(MX) or EM(MQ)
pascal@14150 210 lodsl
pascal@13713 211 popw %ds
pascal@14150 212 jne NoVCPI
pascal@14150 213 xorl $0x30585858, %eax // XXX0
pascal@13713 214 movw $EXEADRS(CmdVCPI), %si
pascal@13713 215 ChkVCPI:
pascal@13713 216 NoVCPI:
pascal@13713 217 movb $EXESTR(ERRvcpi), %al
pascal@13713 218 jne abort
pascal@13713 219 lodsb
pascal@13713 220 shlw $8, %ax
pascal@13713 221 je VersionVCPI
pascal@13713 222 int $0x67
pascal@13713 223 testb %ah, %ah
pascal@14150 224 xchgw %ax, %dx
pascal@13713 225 jmp ChkVCPI
pascal@13713 226 CmdVCPI:
pascal@13713 227 .byte 0x40 // status
pascal@13713 228 .byte 0xDE // vcpi present ?
pascal@13713 229 .byte 0x46 // version
pascal@13713 230 .byte 0
pascal@13713 231
pascal@14261 232 // -------------------------------------------------------------------
pascal@13691 233
pascal@14261 234 help:
pascal@14261 235 .ascii "SliTaz GNU/L" // SliTaz GNU/Linux boot loader
pascal@14261 236 .byte EXESTR(iloader)
pascal@14261 237 no386:
pascal@14261 238 .ascii "No 386" // No 386+
pascal@14261 239 .byte EXESTR(plus)
pascal@14261 240 ERRvcpi:
pascal@14261 241 .ascii "No EMM386/VCPI 4" // No EMM386/VCPI 4.0+
pascal@14261 242 .byte EXESTR(dot0)
pascal@14261 243 chkerr:
pascal@14261 244 .ascii "Broken ISO image fil" // Broken ISO image file.
pascal@14261 245 .byte EXESTR(eeol)
pascal@14261 246 vm86modemsg:
pascal@14261 247 .ascii "vm86" // vm86 mode.
pascal@14261 248 .byte EXESTR(mode)
pascal@14261 249 rmPaging:
pascal@14261 250 .ascii "Invalid: paging + " // Invalid: paging + real mode.
pascal@14261 251 realmodemsg:
pascal@14261 252 .ascii "real" // real mode.
pascal@14261 253 // --------------- Must be in 00C0 013F range ------------------------
pascal@14261 254 mode:
pascal@14261 255 .ascii " mod"
pascal@14261 256 eeol:
pascal@14261 257 .ascii "e"
pascal@14261 258 .byte EXESTR(eol)
pascal@14261 259 //noloader:
pascal@14261 260 // .ascii "No isol" // No isolinux boot loader
pascal@14261 261 iloader:
pascal@14261 262 .ascii "inux boot loader"
pascal@14261 263 eol:
pascal@14261 264 .ascii "."
pascal@14261 265 eol2:
pascal@14261 266 .asciz "\r\n"
pascal@14261 267 noDOS3:
pascal@14261 268 .ascii "No DOS 3" // No DOS 3.0+
pascal@14261 269 dot0:
pascal@14261 270 .ascii ".0"
pascal@14261 271 plus:
pascal@14261 272 .ascii "+"
pascal@14261 273 .byte EXESTR(eol2)
pascal@14261 274
pascal@14261 275 .org 0x8000
pascal@14261 276 ////////////////////////// ISO9660 header /////////////////////////////////////
pascal@14261 277