wok-current rev 20179
ipxe: update bootloader
| author | Pascal Bellard <pascal.bellard@slitaz.org> |
|---|---|
| date | Sat Jan 27 12:56:10 2018 +0100 (2018-01-27) |
| parents | 12473799110f |
| children | 35a23f513b71 |
| files | ipxe/receipt ipxe/stuff/bootloader.S ipxe/stuff/lkrnprefix.S memtest/stuff/bootloader.S |
line diff
1.1 --- a/ipxe/receipt Thu Jan 25 03:48:04 2018 +0200 1.2 +++ b/ipxe/receipt Sat Jan 27 12:56:10 2018 +0100 1.3 @@ -25,13 +25,27 @@ 1.4 sed -i -e 's|//\(#define.*IMAGE_PNG\)|\1|' \ 1.5 -e 's|//\(#define.*CONSOLE_CMD\)|\1|' \ 1.6 -e 's|//\(#define.*REBOOT_CMD\)|\1|' config/general.h 1.7 - cp $stuff/lkrnprefix.S arch/i386/prefix 1.8 + sed -i 's|//\(#define.*CPUID_SETTINGS\)|\1|' config/settings.h 1.9 pxelinux="$(ls $WOK/syslinux/source/*/core/pxelinux.0)" 1.10 make bin/undionly.kkkpxe EMBED=$stuff/ipxelinux.ipxe,$pxelinux && 1.11 mv bin/undionly.kkkpxe bin/ipxelinux.0 1.12 + make bin-i386-efi/snponly.efi EMBED=$stuff/ipxelinux.ipxe,$pxelinux && 1.13 + mv bin-i386-efi/snponly.efi bin-i386-efi/ipxelinux.efi 1.14 make bin/undionly.pxe bin/undionly.kpxe bin/undionly.kkpxe \ 1.15 bin/undionly.kkkpxe bin/ipxe.pxe bin/ipxe.kpxe bin/ipxe.kkpxe \ 1.16 - bin/ipxe.kkkpxe bin/ipxe.nbi bin/ipxe.lkrn EMBED=$stuff/ipxe.cmd 1.17 + bin/ipxe.kkkpxe bin/ipxe.nbi bin/ipxe.lkrn bin-i386-efi/ipxe.efi \ 1.18 + bin-i386-efi/snponly.efi EMBED=$stuff/ipxe.cmd 1.19 + cp $stuff/bootloader.S . 1.20 + cc -o bootloader.o -Wa,-a=bootloader.lst -c bootloader.S 1.21 + objcopy -O binary bootloader.o bootloader.bin 1.22 + size=$(stat -c %s bin/ipxe.lkrn) 1.23 + while read ofs val ; do 1.24 + printf '\\\\x%02X\\\\x%02X' $(($val & 255)) $(($val / 256)) | \ 1.25 + xargs echo -en|dd bs=1 conv=notrunc of=bootloader.bin seek=$ofs 1.26 + done 2> /dev/null <<EOT 1.27 +4 $((($size+511)/512)) 1.28 +14 $((($size+15)/16)) 1.29 +EOT 1.30 } 1.31 1.32 # Rules to gen a SliTaz package suitable for Tazpkg. 1.33 @@ -40,9 +54,5 @@ 1.34 mkdir -p $fs/boot $install/usr/share 1.35 cp -a $src/src/doc $install/usr/share 1.36 cp -a $src/src/bin/ipxe.lkrn $fs/boot/ipxe 1.37 - OFS=$((0x156)) 1.38 - unix2dos <<EOT | dd bs=1 of=$fs/boot/ipxe conv=notrunc \ 1.39 - seek=$OFS count=$((0x1F0-$OFS)) 1.40 -$SHORT_DESC 1.41 -EOT 1.42 + dd if=$src/src/bootloader.bin of=$fs/boot/ipxe conv=notrunc 1.43 }
2.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 2.2 +++ b/ipxe/stuff/bootloader.S Sat Jan 27 12:56:10 2018 +0100 2.3 @@ -0,0 +1,554 @@ 2.4 +// Image/zImage & tiny bzImage linux kernel boot sector, (C) SliTaz, GPL2. 2.5 + 2.6 +SYSSEG = 0x1000 2.7 +INITSEG = 0x9000 2.8 +SETUPSEG = 0x9020 2.9 +setup_sects = 497 2.10 +syssize = 500 2.11 +cmd_line_ptr = 0x228 2.12 + 2.13 + .text 2.14 + .code16 2.15 + .org 0 2.16 + .globl _start 2.17 +_start: 2.18 + 2.19 +#define CODESZ 512 /* patched by installer */ 2.20 + 2.21 +#define BZIMAGE 0x207 /* setup version ; for bzImage < 512 Kb only */ 2.22 + 2.23 +/* some extra features */ 2.24 +#define EXE_SUPPORT real mode dos .exe file support 2.25 +#define CMDLINE kernel cmdline support 2.26 +#define VCPI VCPI 4.0 support 2.27 +#define SHUTDOWNDOS shutdown DOS services 2.28 + 2.29 +/* some contraints to reduce the code size */ 2.30 +//#define FLOPPY_1440K_ONLY 1.44M floppies support only -33 2.31 +//#define FLOPPY_HAS_2_SIDES hardcoded heads count to 2 -13 2.32 +//#define NO_CMDLINE_SHRINK remove heading spaces ? -6-20 2.33 +//#define NO_CMDLINE_FILE remove @cmdline file support ? -20 2.34 +#define NO_DOTS show progression dots ? -8 2.35 +#ifndef BZIMAGE 2.36 +//#defime NO_MINSETUP default setup (dos only) ? -4 2.37 +//#define NO_CURSOR_DEFINITION -8 2.38 +#endif 2.39 + 2.40 +#ifdef EXE_SUPPORT 2.41 +#define EXEADRS(x) (x+0xE0) 2.42 +#define FLAT20(x) (x+16*INITSEG) 2.43 + 2.44 +.macro trace_int19 2.45 + pushl $4 2.46 + popw %si 2.47 + popw %ds 2.48 + pushl (%si) 2.49 + movl $step19+(INITSEG<<16), (%si) 2.50 + pushfw 2.51 + popw %ax 2.52 + incb %ah # set TF 2.53 + pushw %ax 2.54 + popfw 2.55 + ljmp *4*0x19-4(%si) 2.56 +.endm 2.57 + 2.58 +stacktop = 0x9E00 # in 0x8000 .. 0xA000 2.59 + decw %bp // Magic number: MZ 2.60 + popw %dx 2.61 + jmp start // Bytes on last page of file 2.62 + .word (CODESZ+511)/512 // Pages in file INSTALLER 2.63 + .word 0 // Relocations 2.64 + .word (end_header-_start)/16 // Size of header in paragraphs 2.65 + .word 4096 // Minimum extra paragraphs needed 2.66 + .word -1 // Maximum extra paragraphs needed 2.67 + .word (CODESZ+15)/16 // Initial (relative) SS value INSTALLER 2.68 + .word stacktop // Initial SP value 2.69 + .word 0 // Checksum INSTALLER? 2.70 + .word EXEADRS(comstart) // Initial IP value 2.71 + .word 0xFFF0 // Initial (relative) CS value 2.72 +// .word 0x001C // File address of relocation table 2.73 +// .word 0,0,0 // Overlay number 2.74 +#endif 2.75 +start: 2.76 + xorw %ax, %ax # %ax = 0 2.77 +#ifdef BZIMAGE 2.78 +zeroed = 14 # zeroed registers 2.79 +#else 2.80 +zeroed = 12 # zeroed registers 2.81 +#endif 2.82 + movw $zeroed/2, %cx # clear gdt + offset, %ds, limits 2.83 +stacktop = 0x9E00 # in 0x8000 .. 0xA000 (+zeroed+12) 2.84 + pushw $INITSEG 2.85 +end_header: 2.86 + cld # assume nothing 2.87 +#if defined(BZIMAGE) && BZIMAGE >= 0x202 2.88 + popw %es # %es contain INITSEG 2.89 + movw %es, %di 2.90 +#else 2.91 + # cmdline offset at 0x22 2.92 + movw $stacktop, %di # stacktop is an arbitrary value >= 2.93 + # length of bootsect + length of 2.94 + # setup + room for stack; 2.95 + # 12 is disk parm size. 2.96 + popw %es # %es contain INITSEG 2.97 +#endif 2.98 + pushw %es 2.99 + popw %ss # %es = %ss = INITSEG 2.100 + movw %di, %sp # put stack at INITSEG:stacktop-... 2.101 +#ifdef EXE_SUPPORT 2.102 + cwd # force %dx = 0 (floppy only) 2.103 +#endif 2.104 + 2.105 +# Many BIOS's default disk parameter tables will not recognize 2.106 +# multi-sector reads beyond the maximum sector number specified 2.107 +# in the default diskette parameter tables - this may mean 7 2.108 +# sectors in some cases. 2.109 +# 2.110 +# Since single sector reads are slow and out of the question, 2.111 +# we must take care of this by creating new parameter tables 2.112 +# (for the first disk) in RAM. We can set the maximum sector 2.113 +# count to 36 - the most we will encounter on an ED 2.88. 2.114 +# 2.115 +# High doesn't hurt. Low does. Let's use the max: 63 2.116 + 2.117 + rep # don't worry about cld 2.118 + stosw # already done above 2.119 + popw %bx # offset = 0 2.120 + popw %ds # %ds = 0 2.121 + popw %fs # %fs = 0 2.122 + 2.123 + movb setup_sects+0x7C00, %al # read bootsector + setup (%ds = 0) 2.124 + incw %ax 2.125 + 2.126 + ldsw 0x78(%bx), %si # %ds:%bx+0x78 is parameter table address 2.127 + pushw %es 2.128 + pushw %di 2.129 + movb $6, %cl # copy 12 bytes 2.130 + rep # don't worry about cld 2.131 + movsw # already done above 2.132 + pushw %ss 2.133 + popw %ds # now %ds = %es = %ss = INITSEG 2.134 + popl %fs:0x78(%bx) # update parameter table address 2.135 + movb $63, 0x4-12(%di) # patch sector count, %di = stacktop 2.136 + cli 2.137 + 2.138 + xchg %ax, %di # sector count 2.139 + popw %ax # limits = 0 2.140 + incw %cx # cylinder 0, sector 1, clear Z 2.141 + call read_first_sectors # read setup 2.142 + 2.143 +# This routine loads the system at address LOADSEG, making sure 2.144 +# no 64kB boundaries are crossed. We try to load it as fast as 2.145 +# possible, loading whole tracks whenever we can. 2.146 + 2.147 +#ifndef NO_DOTS 2.148 + popw %bx # clear %bx 2.149 +#endif 2.150 + movw syssize, %di 2.151 + decw %di 2.152 + shrw $9-4, %di 2.153 + incw %di 2.154 + movw $SYSSEG, %cx 2.155 +#ifdef BZIMAGE 2.156 + push %cx 2.157 +#endif 2.158 + call read_sectorsCX 2.159 + 2.160 +# This procedure turns off the floppy drive motor, so 2.161 +# that we enter the kernel in a known state, and 2.162 +# don't have to worry about it later. 2.163 + 2.164 +kill_motor: 2.165 + xchgw %ax, %di # reset FDC (%di < 128) 2.166 + int $0x13 2.167 + 2.168 +# After that (everything loaded), we jump to the setup-routine 2.169 +# loaded directly after the bootblock: 2.170 +# Segments are as follows: %ds = %ss = INITSEG 2.171 + 2.172 +#ifdef BZIMAGE 2.173 + popw %bx 2.174 + popw %si // SYSSEG:0 2.175 +movesys: // %bx = DS, %si 2.176 + movw $16, %ax 2.177 + mulw %bx 2.178 + addw %si, %ax 2.179 + adcw $0x9300, %dx // %dx:%ax src flat address 2.180 + movw $9, %cx 2.181 +zero1: 2.182 + pushw $0 // 2E..1E 2.183 + loop zero1 2.184 + //pushl $0x93100000 // 1A: dest 2.185 + pushw $0x9310 2.186 + pushw %cx 2.187 + pushw $-1 // 18 2.188 + pushw %cx // 16 2.189 + pushw %dx // src 2.190 + pushw %ax 2.191 + pushw $-1 // 10 2.192 + movb $8, %cl 2.193 + movw %cx, %bx // will move 8*64 = 512Kb 2.194 +zero2: 2.195 + pushw $0 // 0E..00 2.196 + loop zero2 2.197 + movw %sp, %si 2.198 + pushw %ss 2.199 + popw %es 2.200 + pushw %es 2.201 + popw %ds 2.202 +syslp: 2.203 + movb $0x80, %ch 2.204 + movb $0x87, %ah 2.205 + int $0x15 2.206 + incb 0x14(%si) 2.207 + incb 0x1C(%si) 2.208 + decw %bx 2.209 + jne syslp 2.210 +#endif 2.211 +jmp_setup: 2.212 + ljmp $SETUPSEG, $0 2.213 + 2.214 +#ifdef EXE_SUPPORT 2.215 +#ifdef SHUTDOWNDOS 2.216 +doiret: 2.217 + iret 2.218 +step19: 2.219 + pushw %si 2.220 + pushw %ds 2.221 + movw %sp, %si 2.222 + ldsw %ss:4(%si), %si 2.223 + cmpw $0x19CD, (%si) 2.224 + popw %ds 2.225 + popw %si 2.226 + jne doiret 2.227 + xorw %si, %si 2.228 + movw %si, %ds 2.229 + pushw %cs 2.230 + popw %ss 2.231 + movw $stacktop-4-16, %sp 2.232 + popl 4(%si) 2.233 + popaw 2.234 +#ifdef BZIMAGE 2.235 + jmp movesys 2.236 +#endif 2.237 +#endif 2.238 +#ifndef BZIMAGE 2.239 +movesys: // %ax = SYSSEG, %bx = DS, %si 2.240 + shrw $4, %si 2.241 + addw %si, %bx 2.242 + subw %ax, %bx 2.243 + jnc forward 2.244 + movb $0x90, %ah 2.245 + ;decw %ax 2.246 +forward: 2.247 + movw %ax, %es 2.248 + movw %ax, %di 2.249 + addw %bx, %di 2.250 + movw %di, %ds 2.251 + sbbw %di, %di // %di = 0 : -1 2.252 + cmc // C = 1 : 0 2.253 + adcw %di, %ax 2.254 + xorw %si, %si 2.255 + xorw %di, %di 2.256 + movb $0x10, %cl 2.257 + cmpb %cl, %ah // move 512k 2.258 + rep 2.259 + movsb 2.260 + jns forward 2.261 +#ifndef NO_CURSOR_DEFINITION 2.262 + movb $1, %ah 2.263 + movb $0, %bh 2.264 + movb $0x20, %ch // 0x2000 2.265 + int $0x10 2.266 +#endif 2.267 + pushw %ss 2.268 + popw %ds 2.269 + jmp jmp_setup 2.270 +#endif 2.271 +comstart: 2.272 + cld # assume nothing 2.273 + pushw $INITSEG 2.274 + popw %es 2.275 +#ifdef CMDLINE 2.276 + movw %sp, %di 2.277 + movw $0x80, %si 2.278 + lodsb 2.279 + cbw 2.280 + xchgw %ax, %cx 2.281 + jcxz nocmdline 2.282 +# if defined(BZIMAGE) && BZIMAGE >= 0x202 2.283 + movw $INITSEG/16+stacktop/256, EXEADRS(cmd_line_ptr+1) 2.284 +# else 2.285 + movw $0xA33F, 0x7F(%si) 2.286 +# endif 2.287 +# ifndef NO_CMDLINE_SHRINK 2.288 +skipspace: 2.289 + lodsb 2.290 + cmpb $0x20, %al 2.291 + je skipspace 2.292 +# ifndef NO_CMDLINE_FILE 2.293 + movw %si,%dx 2.294 + decw %si 2.295 + subb $'@',%al 2.296 + jne notafile 2.297 + movb $0x3D,%ah 2.298 + int $0x21 2.299 + jc notafile 2.300 + xchgw %ax,%bx 2.301 + //movw %si,%dx // ~320 bytes max 2.302 + movw $EXEADRS(notafile)-130,%cx 2.303 + movb $0x3F,%ah 2.304 + int $0x21 2.305 + xchgw %ax,%cx 2.306 +notafile: 2.307 +# else 2.308 + decw %si 2.309 +# endif 2.310 +# endif 2.311 + rep 2.312 + movsb 2.313 +nocmdline: 2.314 + orb EXEADRS(setup_sects), %ch 2.315 +# ifndef NO_MINSETUP 2.316 +# ifndef BZIMAGE 2.317 + jnz setupok 2.318 + mov $4, %ch 2.319 +setupok: 2.320 +# endif 2.321 +# endif 2.322 +#else 2.323 + movb EXEADRS(setup_sects), %ch 2.324 +#endif 2.325 + movb $(512-(end_header-_start))/2, %cl 2.326 + movw $0x100, %si 2.327 + movw $end_header, %di 2.328 + rep 2.329 + movsw 2.330 + movw $SYSSEG, %ax 2.331 + movw %ds, %bx 2.332 + pushw %es 2.333 + popw %ss 2.334 +#ifndef SHUTDOWNDOS 2.335 + pushw %es 2.336 + pushw $movesys 2.337 +#endif 2.338 +#ifdef VCPI 2.339 + pushaw 2.340 + smsww %ax 2.341 + andb $1, %al 2.342 + je isrm 2.343 + movw $EXEADRS(gdt_vcpi),%si 2.344 + movw $pagebuf-0x90000,%di // %es = 0x9000 2.345 + movl $pagebuf+3,%es:0x1000(%di) 2.346 +call_vcpi: 2.347 + movb $0xDE,%ah // DE01, EBX = getiface(DS:SI, ES:DI) 2.348 + int $0x67 2.349 + movl $FLAT20(sw2pm_params),%esi 2.350 + movb $0x0C,%al // DE0C switchpm(ESI) 2.351 + cli 2.352 + jmp call_vcpi 2.353 +pm_code: 2.354 + movl %cr0,%eax 2.355 + andl $0x7FFFFFFE,%eax 2.356 + movl %eax,%cr0 2.357 + movl %eax,%cr3 2.358 +isrm: 2.359 +# ifdef SHUTDOWNDOS 2.360 + trace_int19 2.361 +# else 2.362 + lssw %cs:EXEADRS(saved_ss_sp),%sp 2.363 + popaw 2.364 + retf 2.365 +# endif 2.366 +#else 2.367 +# ifdef SHUTDOWNDOS 2.368 + pushaw 2.369 + trace_int19 2.370 +# endif 2.371 + retf 2.372 +#endif 2.373 +#endif 2.374 + 2.375 +# read_sectors reads %di sectors into %es:0 buffer. 2.376 +# %es:0 is updated to the next memory location. 2.377 +# First, sectors are read sector by sector until 2.378 +# sector per track count is known. Then they are 2.379 +# read track by track. 2.380 +# Assume no error on first track. 2.381 + 2.382 +#ifdef FLOPPY_1440K_ONLY 2.383 +#define FLOPPY_HAS_2_SIDES hardcore heads count to 2 2.384 +#define FLOPPY_SECTORS 18 /* 18 sectors */ 2.385 +#else 2.386 +#define FLOPPY_HEADS 2 /* 2 heads minimum */ 2.387 +#endif 2.388 + 2.389 +return: 2.390 +#ifndef NO_DOTS 2.391 + movw $0xE2E,%ax 2.392 + movb $7,%bl 2.393 + int $0x10 2.394 +#endif 2.395 + ret 2.396 + 2.397 +check_limits: 2.398 +#ifndef FLOPPY_1440K_ONLY 2.399 + popw %dx 2.400 + cmpb %al, %cl # max sector known ? 2.401 + ja next_head # no -> store it 2.402 +#ifndef FLOPPY_HAS_2_SIDES 2.403 +#ifdef FLOPPY_HEADS 2.404 + cmpb $FLOPPY_HEADS, %dh # 2 heads minimum 2.405 + jb check_cylinder 2.406 +#endif 2.407 + cmpb %ah, %dh # max head known ? 2.408 + ja next_cylinder # no -> store it 2.409 +check_cylinder: 2.410 +#endif 2.411 +#endif 2.412 + pushaw 2.413 +#ifndef FLOPPY_1440K_ONLY 2.414 + cbw # %ah = 0 2.415 +#endif 2.416 + int $0x13 # reset controler 2.417 + popaw 2.418 + movb $1, %al # sector by sector... 2.419 +read_sectorslp: 2.420 + pushw %dx # some bios break dx... 2.421 +#ifndef FLOPPY_1440K_ONLY 2.422 + pushw %ax # limits 2.423 + subb %cl, %al # sectors remaining in track 2.424 + ja tolastsect 2.425 + movb $1, %al # 1 sector mini 2.426 +tolastsect: 2.427 +#else 2.428 + movb $FLOPPY_SECTORS+1, %al 2.429 + subb %cl, %al # sectors remaining in track 2.430 +#endif 2.431 + cbw 2.432 + cmpw %di, %ax 2.433 + jb more1trk 2.434 + movw %di, %ax # sectors to read 2.435 +more1trk: 2.436 + pushw %ax # save context 2.437 + movb $2, %ah # cmd: read chs 2.438 + int $0x13 2.439 +#ifndef FLOPPY_1440K_ONLY 2.440 + popw %dx # save %ax 2.441 + popw %ax # limits 2.442 +#else 2.443 + popw %ax # restore context 2.444 + popw %dx 2.445 +#endif 2.446 + jc check_limits 2.447 +#ifndef FLOPPY_1440K_ONLY 2.448 + xchgw %ax, %bp 2.449 + addw %dx,%cx # next sector 2.450 + movw %cx, %gs 2.451 + movw %es, %cx 2.452 + pushw %dx 2.453 + shlw $5, %dx 2.454 + addw %dx, %cx 2.455 + popw %dx 2.456 + subw %dx,%di # update sector counter 2.457 + popw %dx 2.458 +#else 2.459 + addw %ax,%cx # next sector 2.460 + movw %cx, %gs 2.461 + movw %es, %cx 2.462 + pushw %ax 2.463 + shlw $5, %ax 2.464 + addw %ax, %cx 2.465 + popw %ax 2.466 + subw %ax,%di # update sector counter 2.467 +#endif 2.468 +read_sectorsCX: 2.469 + movw %cx, %es # next location 2.470 + jz return 2.471 +read_sectors: 2.472 + movw %gs, %cx 2.473 +#ifndef FLOPPY_1440K_ONLY 2.474 +# al is last sector+1 2.475 +# ah is last cylinder+1 2.476 + xchgw %ax, %bp 2.477 +#endif 2.478 +#ifndef FLOPPY_1440K_ONLY 2.479 + cmpb %al,%cl # reach sector limit ? 2.480 + jne bdendlp 2.481 +next_head: 2.482 + movb %cl,%al 2.483 +#else 2.484 + cmpb $FLOPPY_SECTORS+1,%cl # reach sector limit ? 2.485 + jne bdendlp 2.486 +#endif 2.487 + movb $1,%cl # first sector 2.488 +#ifndef FLOPPY_HAS_2_SIDES 2.489 + incb %dh # next head 2.490 + cmpb %ah, %dh # reach head limit ? 2.491 + jne bdendlp 2.492 +next_cylinder: 2.493 + movb %dh,%ah 2.494 + movb $0,%dh # first head 2.495 +#else 2.496 + xorb %cl,%dh # next head 2.497 + jne bdendlp # reach head limit ? 2.498 +#endif 2.499 +# NOTE : support 256 cylinders max 2.500 + incb %ch # next cylinder 2.501 +read_first_sectors: 2.502 +bdendlp: 2.503 + jmp read_sectorslp 2.504 + 2.505 +#ifdef VCPI 2.506 +pagebuf = 0x98000 2.507 +tss = gdt_abs-40 2.508 +gdt = gdt_abs-32 2.509 +gdt_null = gdt_abs-32 2.510 +gdt_vcpi = gdt_abs-24 2.511 +gdt_vcpi2 = gdt_abs-16 2.512 +gdt_vcpi3 = gdt_abs-8 2.513 +gdt_abs: 2.514 + .word 0xFFFF 2.515 + .long 0x92000000 2.516 + .byte 0xCF,0 2.517 +gdt_code: 2.518 + .word 0xFFFF 2.519 +gdt_code_base: 2.520 + .long 0x9A000000+FLAT20(0) 2.521 + .byte 0x8F,0 2.522 +gdt_tss: 2.523 + .word 0x00FF 2.524 +gdt_tss_base: 2.525 + .long 0x89000000+FLAT20(tss) 2.526 + .byte 0,0 2.527 +gdtr: 2.528 +gdt_lim: 2.529 + .word 0xFFFF 2.530 +gdt_base: 2.531 + .long FLAT20(gdt) 2.532 +sw2pm_params: 2.533 +sw2pm_cr3: 2.534 + .long pagebuf+0x1000 2.535 +sw2pm_gdtr_ptr: 2.536 + .long FLAT20(gdtr) 2.537 +sw2pm_idtr_ptr: 2.538 + .long FLAT20(idtr) 2.539 +sw2pm_ldtr: 2.540 + .word 0 2.541 +sw2pm_tr: 2.542 +SEL_TSS = gdt_tss-gdt_null 2.543 + .word SEL_TSS 2.544 +sw2pm_jumpaddr: 2.545 + .long pm_code 2.546 +SEL_CODE = gdt_code-gdt_null 2.547 + .word SEL_CODE 2.548 +idtr: 2.549 +idt_lim: 2.550 + .word 0x03FF 2.551 +idt_base: 2.552 + .long 0 2.553 +# ifndef SHUTDOWNDOS 2.554 +saved_ss_sp: 2.555 + .word stacktop-4-16-4,INITSEG 2.556 +# endif 2.557 +#endif
3.1 --- a/ipxe/stuff/lkrnprefix.S Thu Jan 25 03:48:04 2018 +0200 3.2 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 3.3 @@ -1,639 +0,0 @@ 3.4 -/* 3.5 - Copyright (C) 2000, Entity Cyber, Inc. 3.6 - 3.7 - Authors: Gary Byers (gb@thinguin.org) 3.8 - Marty Connor (mdc@thinguin.org) 3.9 - 3.10 - This software may be used and distributed according to the terms 3.11 - of the GNU Public License (GPL), incorporated herein by reference. 3.12 - 3.13 - Description: 3.14 - 3.15 - This is just a little bit of code and data that can get prepended 3.16 - to a ROM image in order to allow bootloaders to load the result 3.17 - as if it were a Linux kernel image. 3.18 - 3.19 - A real Linux kernel image consists of a one-sector boot loader 3.20 - (to load the image from a floppy disk), followed a few sectors 3.21 - of setup code, followed by the kernel code itself. There's 3.22 - a table in the first sector (starting at offset 497) that indicates 3.23 - how many sectors of setup code follow the first sector and which 3.24 - contains some other parameters that aren't interesting in this 3.25 - case. 3.26 - 3.27 - We don't require much in the way of setup code. Historically, the 3.28 - Linux kernel required at least 4 sectors of setup code. 3.29 - Therefore, at least 4 sectors must be present even though we don't 3.30 - use them. 3.31 - 3.32 -*/ 3.33 - 3.34 -FILE_LICENCE ( GPL_ANY ) 3.35 - 3.36 -#define SETUPSECS 4 /* Minimal nr of setup-sectors */ 3.37 -#define PREFIXSIZE ((SETUPSECS+1)*512) 3.38 -#define PREFIXPGH (PREFIXSIZE / 16 ) 3.39 -#define BOOTSEG 0x07C0 /* original address of boot-sector */ 3.40 -#define INITSEG 0x9000 /* we move boot here - out of the way */ 3.41 -#define SETUPSEG 0x9020 /* setup starts here */ 3.42 -#define SYSSEG 0x1000 /* system loaded at 0x10000 (65536). */ 3.43 - 3.44 - .text 3.45 - .code16 3.46 - .arch i386 3.47 - .org 0 3.48 - .section ".prefix", "ax", @progbits 3.49 - .globl _lkrn_start 3.50 -_lkrn_start: 3.51 - 3.52 -bootsector: 3.53 -_start: 3.54 - 3.55 -/* some extra features */ 3.56 -#define EXE_SUPPORT real mode dos .exe file support 3.57 - 3.58 -#define EXEADRS(x) (x+0xE0) 3.59 - 3.60 -/* some contraints to reduce the size */ 3.61 -//#define FLOPPY_1440K_ONLY 1.44M floppies support only 3.62 - 3.63 -#ifdef EXE_SUPPORT 3.64 -/* Initial temporary stack size */ 3.65 -#define EXE_STACK_SIZE 0x400 3.66 - 3.67 -/* Temporary decompression area (avoid DOS high memory area) */ 3.68 -#define EXE_DECOMPRESS_ADDRESS 0x110000 3.69 - 3.70 -/* Fields within the Program Segment Prefix */ 3.71 -#define PSP_CMDLINE_LEN 0x80 3.72 -#define PSP_CMDLINE_START 0x81 3.73 - 3.74 -#define HEADER_SIZE 0x20 3.75 - 3.76 -signature: 3.77 - decw %bp // Magic number: MZ 3.78 - popw %dx 3.79 - jmp start // Bytes on last page of file 3.80 -blocks: 3.81 - .word 0 // Pages in file 3.82 - .section ".zinfo.fixup", "a", @progbits /* Compressor fixups */ 3.83 - .ascii "ADDW" 3.84 - .long blocks 3.85 - .long 512 3.86 - .long 0 3.87 - .previous 3.88 - .word 0 // Relocations 3.89 - .word ( HEADER_SIZE / 16 ) // Size of header in paragraphs 3.90 - .word ( EXE_STACK_SIZE / 16 ) // Minimum extra paragraphs needed 3.91 - .word ( EXE_STACK_SIZE / 16 ) // Maximum extra paragraphs needed 3.92 -init_ss: 3.93 - .word -( ( _exe_start - signature ) / 16 ) // Initial (relative) SS value 3.94 - .section ".zinfo.fixup", "a", @progbits /* Compressor fixups */ 3.95 - .ascii "ADDW" 3.96 - .long init_ss 3.97 - .long 16 3.98 - .long 0 3.99 - .previous 3.100 - .word EXE_STACK_SIZE // Initial SP value 3.101 - .word 0 // Checksum 3.102 - .word _exe_start // Initial IP value 3.103 - /* Initial code segment (relative to start of executable) */ 3.104 - .word -( HEADER_SIZE / 16 ) // Initial (relative) CS value 3.105 -// .word 0x001C // File address of relocation table 3.106 -// .word 0,0,0 // Overlay number 3.107 - .ascii "(SliTaz)" 3.108 - 3.109 -start: 3.110 - pushw %dx 3.111 -#endif 3.112 - cld # assume nothing 3.113 -stacktop = 0x9E00 # in 0x8000 .. 0xA000 3.114 -zeroed = 12 # zeroed registers 3.115 - movw $stacktop-12-zeroed, %di # stacktop is an arbitrary value >= 3.116 - # length of bootsect + length of 3.117 - # setup + room for stack; 3.118 - # 12 is disk parm size. 3.119 - pushw $INITSEG 3.120 - popw %ss # %ss contain INITSEG 3.121 - movw %di, %sp # put stack at INITSEG:stacktop-... 3.122 - 3.123 -# Many BIOS's default disk parameter tables will not recognize 3.124 -# multi-sector reads beyond the maximum sector number specified 3.125 -# in the default diskette parameter tables - this may mean 7 3.126 -# sectors in some cases. 3.127 -# 3.128 -# Since single sector reads are slow and out of the question, 3.129 -# we must take care of this by creating new parameter tables 3.130 -# (for the first disk) in RAM. We can set the maximum sector 3.131 -# count to 36 - the most we will encounter on an ED 2.88. 3.132 -# 3.133 -# High doesn't hurt. Low does. Let's use the max: 63 3.134 - 3.135 - pushw %ss 3.136 - popw %es # %es = %ss = INITSEG 3.137 - xorw %ax, %ax # %ax = 0 3.138 -#ifdef EXE_SUPPORT 3.139 - cwd # %dx = 0 3.140 -#endif 3.141 - movw $zeroed/2, %cx # clear gdt + offset, %ds, limits 3.142 - rep # don't worry about cld 3.143 - stosw # already done above 3.144 - popw %bx # offset = 0 3.145 - popw %ds # %ds = 0 3.146 - popw %fs # %fs = 0 3.147 - 3.148 - movb setup_sects+0x7C00, %al # read bootsector + setup (%ds = 0) 3.149 - incw %ax 3.150 - 3.151 - ldsw 0x78(%bx), %si # %ds:%bx+0x78 is parameter table address 3.152 - pushw %es 3.153 - pushw %di 3.154 - movb $6, %cl # copy 12 bytes 3.155 - rep # don't worry about cld 3.156 - movsw # already done above 3.157 - pushw %ss 3.158 - popw %ds # now %ds = %es = %ss = INITSEG 3.159 - popl %fs:0x78(%bx) # update parameter table address 3.160 - movb $63, 0x4-12(%di) # patch sector count, %di = stacktop 3.161 - cli 3.162 - 3.163 - xchg %ax, %di # sector count 3.164 - popw %ax # limits = 0 3.165 - incw %cx # cylinder 0, sector 1, clear Z 3.166 - call read_first_sectors # read setup 3.167 - 3.168 -# This routine loads the system at address LOADSEG, making sure 3.169 -# no 64kB boundaries are crossed. We try to load it as fast as 3.170 -# possible, loading whole tracks whenever we can. 3.171 - 3.172 - popw %bx # clear %bx 3.173 - movw syssize, %di 3.174 - addw $(512/16)-1, %di 3.175 - shrw $9-4, %di 3.176 - movw $SYSSEG, %cx 3.177 - call read_sectorsCX 3.178 - 3.179 -# This procedure turns off the floppy drive motor, so 3.180 -# that we enter the kernel in a known state, and 3.181 -# don't have to worry about it later. 3.182 - 3.183 -kill_motor: 3.184 - xchgw %ax, %di # reset FDC (%di < 128) 3.185 - int $0x13 3.186 - 3.187 -# After that (everything loaded), we jump to the setup-routine 3.188 -# loaded directly after the bootblock: 3.189 -# Segments are as follows: %ds = %ss = INITSEG 3.190 - 3.191 - ljmp $SETUPSEG, $0 3.192 - 3.193 -#ifdef EXE_SUPPORT 3.194 -dosexit: 3.195 - movw $0x4c00, %ax 3.196 - int $0x21 3.197 - 3.198 -_exe_start: 3.199 - pushw $dosexit 3.200 - movw $EXEADRS(need386), %si 3.201 - pushfw // save flags 3.202 - // bits 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 3.203 - // flags 0 NT IOPL OF DF IF TF SF ZF 0 AF 0 PF 1 CF 3.204 - movb $0x10, %ah // DF = IF = TF = 0 3.205 - pushw %ax 3.206 - popfw // < 286 : flags[12..15] are forced 1 3.207 - pushfw // = 286 : flags[12..15] are forced 0 3.208 - popw %cx // > 286 : only flags[15] is forced 0 3.209 - popfw // restore flags 3.210 - cmpb %ah, %ch // test Fx and 0x cases 3.211 - js puts // S= not 386+ 3.212 -// smsww %ax 3.213 -// andb $1, %al 3.214 -// jne puts 3.215 - 3.216 - /* Terminate command line with a NUL */ 3.217 - movzbw PSP_CMDLINE_LEN, %si 3.218 - movb $0, PSP_CMDLINE_START(%si) 3.219 - cmpb $'?', PSP_CMDLINE_START-1(%si) 3.220 - je help 3.221 - pushw %si 3.222 - 3.223 - /* Install iPXE. Use a fixed temporary decompression area to 3.224 - * avoid trashing the DOS high memory area. 3.225 - */ 3.226 - call alloc_basemem 3.227 - movl $EXE_DECOMPRESS_ADDRESS, %edi 3.228 - stc 3.229 - sbbl %ebp, %ebp /* Allow arbitrary relocation */ 3.230 - xorl %esi, %esi 3.231 - call install_prealloc 3.232 - 3.233 - xorl %ebp, %ebp 3.234 - xorl %ecx, %ecx 3.235 - 3.236 - /* Calculate command line physical address */ 3.237 - xorl %edx, %edx 3.238 - movw %ds, %dx 3.239 - shll $4, %edx 3.240 - popw %si 3.241 - orw %si, %si 3.242 - jne gotarg 3.243 - movw $EXEADRS(default_config), %bp 3.244 - addl %edx, %ebp 3.245 - movw $0xA00-default_config, %cx 3.246 -gotarg: 3.247 - addl $PSP_CMDLINE_START, %edx 3.248 - 3.249 - jmp start_ipxe 3.250 - 3.251 -help: 3.252 - movw $EXEADRS(helpmsg), %si 3.253 -puts: 3.254 - lodsb 3.255 - orb %al, %al 3.256 - je exit 3.257 - call putc 3.258 - jmp puts 3.259 -#endif 3.260 - 3.261 -putcdot: 3.262 - movb $0x2E, %al 3.263 -putc: 3.264 - movb $0xE, %ah 3.265 - movw $7, %bx 3.266 - int $0x10 3.267 -exit: 3.268 - ret 3.269 - 3.270 - 3.271 -# read_sectors reads %di sectors into %es:0 buffer. 3.272 -# %es:0 is updated to the next memory location. 3.273 -# First, sectors are read sector by sector until 3.274 -# sector per track count is known. Then they are 3.275 -# read track by track. 3.276 -# Assume no error on first track. 3.277 - 3.278 -#ifdef FLOPPY_1440K_ONLY 3.279 -#define FLOPPY_HEADS 2 /* 2 heads */ 3.280 -#define FLOPPY_SECTORS 18 /* 18 sectors */ 3.281 -#else 3.282 -#define FLOPPY_HEADS 2 /* 2 heads minimum */ 3.283 -#define FLOPPY_SECTORS 9 /* 9 sectors minimum */ 3.284 -#endif 3.285 - 3.286 -check_limits: 3.287 -#ifndef FLOPPY_1440K_ONLY 3.288 - popw %dx 3.289 -#ifdef FLOPPY_SECTORS 3.290 - cmpb $FLOPPY_SECTORS+1, %cl # minimum sector count 3.291 - jb check_head 3.292 -#endif 3.293 - cmpb %al, %cl # max sector known ? 3.294 - ja next_head # no -> store it 3.295 -check_head: 3.296 -#ifdef FLOPPY_HEADS 3.297 - cmpb $FLOPPY_HEADS, %dh # 2 heads minimum 3.298 - jb check_cylinder 3.299 -#endif 3.300 - cmpb %ah, %dh # max head known ? 3.301 - ja next_cylinder # no -> store it 3.302 -check_cylinder: 3.303 -#endif 3.304 - pushaw 3.305 -#ifndef FLOPPY_1440K_ONLY 3.306 - cbw # %ah = 0 3.307 -#endif 3.308 - int $0x13 # reset controler 3.309 - popaw 3.310 - movb $1, %al # sector by sector... 3.311 -read_sectorslp: 3.312 - pushw %dx # some bios break dx... 3.313 -#ifndef FLOPPY_1440K_ONLY 3.314 - pushw %ax # limits 3.315 - subb %cl, %al # sectors remaining in track 3.316 - ja tolastsect 3.317 - movb $1, %al # 1 sector mini 3.318 -tolastsect: 3.319 -#else 3.320 - mov $FLOPPY_SECTORS+1, %al 3.321 - subb %cl, %al # sectors remaining in track 3.322 -#endif 3.323 - cbw 3.324 - cmpw %di, %ax 3.325 - jb more1trk 3.326 - movw %di, %ax # sectors to read 3.327 -more1trk: 3.328 - pushw %ax # save context 3.329 - movb $2, %ah # cmd: read chs 3.330 - int $0x13 3.331 -#ifndef FLOPPY_1440K_ONLY 3.332 - popw %dx # save %ax 3.333 - popw %ax # limits 3.334 -#else 3.335 - popw %ax # restore context 3.336 - popw %dx 3.337 -#endif 3.338 - jc check_limits 3.339 -#ifndef FLOPPY_1440K_ONLY 3.340 - xchgw %ax, %bp 3.341 - addw %dx,%cx # next sector 3.342 - movw %cx, %gs 3.343 - movw %es, %cx 3.344 - pushw %dx 3.345 - shlw $5, %dx 3.346 - addw %dx, %cx 3.347 - popw %dx 3.348 - subw %dx,%di # update sector counter 3.349 - popw %dx 3.350 -read_sectorsCX: 3.351 - movw %cx, %es # next location 3.352 - jz putcdot 3.353 -#else 3.354 - addw %ax,%cx # next sector 3.355 - movw %cx, %gs 3.356 - movw %es, %cx 3.357 - pushw %ax 3.358 - shlw $5, %ax 3.359 - addw %ax, %cx 3.360 - popw %ax 3.361 - subw %ax,%di # update sector counter 3.362 -read_sectorsCX: 3.363 - movw %cx, %es # next location 3.364 - jz putcdot 3.365 -#endif 3.366 -read_sectors: 3.367 - movw %gs, %cx 3.368 -#ifndef FLOPPY_1440K_ONLY 3.369 -# al is last sector+1 3.370 -# ah is last cylinder+1 3.371 - xchgw %ax, %bp 3.372 -#endif 3.373 -#ifndef FLOPPY_1440K_ONLY 3.374 - cmpb %al,%cl # reach sector limit ? 3.375 - jne bdendlp 3.376 -next_head: 3.377 - movb %cl,%al 3.378 -#else 3.379 - cmpb $FLOPPY_SECTORS+1,%cl # reach sector limit ? 3.380 - jne bdendlp 3.381 -#endif 3.382 - incb %dh # next head 3.383 - movb $1,%cl # first sector 3.384 -#ifndef FLOPPY_1440K_ONLY 3.385 - cmpb %ah, %dh # reach head limit ? 3.386 - jne bdendlp 3.387 -next_cylinder: 3.388 - movb %dh,%ah 3.389 -#else 3.390 - cmpb %cl,%dh # reach head limit ? 3.391 - je bdendlp 3.392 -#endif 3.393 -# NOTE : support 256 cylinders max 3.394 - incb %ch # next cylinder 3.395 - movb $0,%dh # first head 3.396 -read_first_sectors: 3.397 -bdendlp: 3.398 - jmp read_sectorslp 3.399 - 3.400 -#ifdef EXE_SUPPORT 3.401 -need386: 3.402 - .ascii "No 386+." 3.403 - .byte 13,10 3.404 - .byte 0 3.405 -helpmsg: 3.406 - .ascii "No help available." 3.407 - .byte 13,10 3.408 - .byte 0 3.409 -#endif 3.410 - 3.411 -/* 3.412 - The following header is documented in the Linux source code at 3.413 - Documentation/x86/boot.txt 3.414 -*/ 3.415 - .org 497 3.416 -setup_sects: 3.417 - .byte SETUPSECS 3.418 -root_flags: 3.419 - .word 0 3.420 -syssize: 3.421 - .long -PREFIXPGH 3.422 - 3.423 - .section ".zinfo.fixup", "a", @progbits /* Compressor fixups */ 3.424 - .ascii "ADDL" 3.425 - .long syssize 3.426 - .long 16 3.427 - .long 0 3.428 - .previous 3.429 - 3.430 -ram_size: 3.431 - .word 0 3.432 -vid_mode: 3.433 - .word 0 3.434 -root_dev: 3.435 - .word 0 3.436 -boot_flag: 3.437 - .word 0xAA55 3.438 -jump: 3.439 - /* Manually specify a two-byte jmp instruction here rather 3.440 - * than leaving it up to the assembler. */ 3.441 - .byte 0xeb 3.442 - .byte setup_code - header 3.443 -header: 3.444 - .byte 'H', 'd', 'r', 'S' 3.445 -version: 3.446 - .word 0x0207 /* 2.07 */ 3.447 -realmode_swtch: 3.448 - .long 0 3.449 -start_sys: 3.450 - .word 0 3.451 -kernel_version: 3.452 - .word 0 3.453 -type_of_loader: 3.454 - .byte 0 3.455 -loadflags: 3.456 - .byte 0 3.457 -setup_move_size: 3.458 - .word 0 3.459 -code32_start: 3.460 - .long SYSSEG*16 3.461 -ramdisk_image: 3.462 - .long 0 3.463 -ramdisk_size: 3.464 - .long 0 3.465 -bootsect_kludge: 3.466 - .long 0 3.467 -heap_end_ptr: 3.468 - .word 0 3.469 -pad1: 3.470 - .word 0 3.471 -cmd_line_ptr: 3.472 - .long 0 3.473 -initrd_addr_max: 3.474 - /* We don't use an initrd but some bootloaders (e.g. SYSLINUX) have 3.475 - * been known to require this field. Set the value to 2 GB. This 3.476 - * value is also used by the Linux kernel. */ 3.477 - .long 0x7fffffff 3.478 -kernel_alignment: 3.479 - .long 0 3.480 -relocatable_kernel: 3.481 - .byte 0 3.482 -pad2: 3.483 - .byte 0, 0, 0 3.484 -cmdline_size: 3.485 - .long 0x7ff 3.486 -hardware_subarch: 3.487 - .long 0 3.488 -hardware_subarch_data: 3.489 - .byte 0, 0, 0, 0, 0, 0, 0, 0 3.490 - 3.491 -/* 3.492 - We don't need to do too much setup. 3.493 - 3.494 - This code gets loaded at SETUPSEG:0. It wants to start 3.495 - executing the image that's loaded at SYSSEG:0 and 3.496 - whose entry point is SYSSEG:0. 3.497 -*/ 3.498 -setup_code: 3.499 - movl ramdisk_image, %eax 3.500 - orl %eax, %eax 3.501 - jnz setup_done 3.502 - 3.503 - movw $default_config, %di 3.504 - movw $-1, %bx 3.505 - 3.506 - movw $9, %cx 3.507 -1: 3.508 - pushw %ax 3.509 - loop 1b 3.510 - pushw $0x9310 3.511 - pushw %ax 3.512 - pushw %bx 3.513 - pushw %ax 3.514 - pushw $0x9300+(INITSEG>>12) 3.515 - pushw %di 3.516 - pushw %bx 3.517 - movb $8, %cl 3.518 -1: 3.519 - pushw %ax 3.520 - loop 1b 3.521 -1: 3.522 - incw %bx 3.523 - cmpb %al, (%bx,%di) 3.524 - jne 1b 3.525 - movw %bx, ramdisk_size 3.526 - movb $0x10, ramdisk_image+2 3.527 - 3.528 - pushw %ss 3.529 - popw %es 3.530 - movw %sp, %si 3.531 - movb $0x87, %ah 3.532 - movw $(run_ipxe-default_config)/2+1, %cx 3.533 - int $0x15 3.534 - 3.535 -setup_done: 3.536 - /* We expect to be contiguous in memory once loaded. The Linux image 3.537 - * boot process requires that setup code is loaded separately from 3.538 - * "non-real code". Since we don't need any information that's left 3.539 - * in the prefix, it doesn't matter: we just have to ensure that 3.540 - * %cs:0000 is where the start of the image *would* be. 3.541 - */ 3.542 - ljmp $(SYSSEG-(PREFIXSIZE/16)), $run_ipxe 3.543 - 3.544 -default_config: 3.545 - 3.546 - .org PREFIXSIZE 3.547 -/* 3.548 - We're now at the beginning of the kernel proper. 3.549 - */ 3.550 -run_ipxe: 3.551 - /* Set up stack just below 0x7c00 and clear direction flag */ 3.552 - xorw %ax, %ax 3.553 - movw %ax, %ss 3.554 - movw $0x7c00, %sp 3.555 - cld 3.556 - 3.557 - /* Retrieve command-line pointer */ 3.558 - movl %ds:cmd_line_ptr, %edx 3.559 - testl %edx, %edx 3.560 - jz no_cmd_line 3.561 - 3.562 - /* Set up %es:%di to point to command line */ 3.563 - movl %edx, %edi 3.564 - andl $0xf, %edi 3.565 - rorl $4, %edx 3.566 - movw %dx, %es 3.567 - 3.568 - /* Find length of command line */ 3.569 - pushw %di 3.570 - movw $0xffff, %cx 3.571 - repnz scasb 3.572 - notw %cx 3.573 - popw %si 3.574 - 3.575 - /* Make space for command line on stack */ 3.576 - movw %sp, %di 3.577 - subw %cx, %di 3.578 - andw $~0xf, %di 3.579 - movw %di, %sp 3.580 - 3.581 - /* Copy command line to stack */ 3.582 - pushw %ds 3.583 - pushw %es 3.584 - popw %ds 3.585 - pushw %ss 3.586 - popw %es 3.587 - rep movsb 3.588 - popw %ds 3.589 - 3.590 - /* Store new command-line pointer */ 3.591 - movzwl %sp, %edx 3.592 -no_cmd_line: 3.593 - 3.594 - /* Calculate maximum relocation address */ 3.595 - movl ramdisk_image, %ebp 3.596 - testl %ebp, %ebp 3.597 - jnz 1f 3.598 - decl %ebp /* Allow arbitrary relocation if no initrd */ 3.599 -1: 3.600 - 3.601 - /* Install iPXE */ 3.602 - call alloc_basemem 3.603 - xorl %esi, %esi 3.604 - xorl %edi, %edi 3.605 - call install_prealloc 3.606 - 3.607 - /* Retrieve initrd pointer and size */ 3.608 - movl ramdisk_image, %ebp 3.609 - movl ramdisk_size, %ecx 3.610 - 3.611 -start_ipxe: 3.612 - /* Set up real-mode stack */ 3.613 - movw %bx, %ss 3.614 - movw $_estack16, %sp 3.615 - 3.616 - /* Jump to .text16 segment */ 3.617 - pushw %ax 3.618 - pushw $1f 3.619 - lret 3.620 - .section ".text16", "awx", @progbits 3.621 -1: 3.622 - /* Set up %ds for access to .data16 */ 3.623 - movw %bx, %ds 3.624 - 3.625 - /* Store command-line pointer */ 3.626 - movl %edx, cmdline_phys 3.627 - 3.628 - /* Store initrd pointer and size */ 3.629 - movl %ebp, initrd_phys 3.630 - movl %ecx, initrd_len 3.631 - 3.632 - /* Run iPXE */ 3.633 - pushl $main 3.634 - pushw %cs 3.635 - call prot_call 3.636 - popl %ecx /* discard */ 3.637 - 3.638 - /* Uninstall iPXE */ 3.639 - call uninstall 3.640 - 3.641 - /* Boot next device */ 3.642 - int $0x18
4.1 --- a/memtest/stuff/bootloader.S Thu Jan 25 03:48:04 2018 +0200 4.2 +++ b/memtest/stuff/bootloader.S Sat Jan 27 12:56:10 2018 +0100 4.3 @@ -1,10 +1,11 @@ 4.4 -// Image/zImage boot sector 4.5 +// Image/zImage & tiny bzImage linux kernel boot sector, (C) SliTaz, GPL2. 4.6 4.7 SYSSEG = 0x1000 4.8 INITSEG = 0x9000 4.9 SETUPSEG = 0x9020 4.10 setup_sects = 497 4.11 syssize = 500 4.12 +cmd_line_ptr = 0x228 4.13 4.14 .text 4.15 .code16 4.16 @@ -14,20 +15,24 @@ 4.17 4.18 #define CODESZ 512 /* patched by installer */ 4.19 4.20 +//#define BZIMAGE 0x207 /* setup version ; for bzImage < 512 Kb only */ 4.21 + 4.22 /* some extra features */ 4.23 #define EXE_SUPPORT real mode dos .exe file support 4.24 -#define CMDLINE 0x9E00 4.25 +#define CMDLINE kernel cmdline support 4.26 #define VCPI VCPI 4.0 support 4.27 #define SHUTDOWNDOS shutdown DOS services 4.28 4.29 -/* some contraints to reduce the size */ 4.30 +/* some contraints to reduce the code size */ 4.31 //#define FLOPPY_1440K_ONLY 1.44M floppies support only -33 4.32 //#define FLOPPY_HAS_2_SIDES hardcoded heads count to 2 -13 4.33 -//#define MOVE_MAX_SYSSIZE always memcpy 512Kb -2 4.34 -//#define NO_CURSOR_DEFINITION -8 4.35 -//#define NO_CMDLINE_SHRINK remove heading spaces ? -6 4.36 +//#define NO_CMDLINE_SHRINK remove heading spaces ? -6-20 4.37 //#define NO_CMDLINE_FILE remove @cmdline file support ? -20 4.38 //#define NO_DOTS show progression dots ? -8 4.39 +#ifndef BZIMAGE 4.40 +//#defime NO_MINSETUP default setup (dos only) ? -4 4.41 +//#define NO_CURSOR_DEFINITION -8 4.42 +#endif 4.43 4.44 #ifdef EXE_SUPPORT 4.45 #define EXEADRS(x) (x+0xE0) 4.46 @@ -65,23 +70,33 @@ 4.47 // .word 0,0,0 // Overlay number 4.48 #endif 4.49 start: 4.50 - cld # assume nothing 4.51 xorw %ax, %ax # %ax = 0 4.52 +#ifdef BZIMAGE 4.53 +zeroed = 14 # zeroed registers 4.54 +#else 4.55 zeroed = 12 # zeroed registers 4.56 +#endif 4.57 + movw $zeroed/2, %cx # clear gdt + offset, %ds, limits 4.58 stacktop = 0x9E00 # in 0x8000 .. 0xA000 (+zeroed+12) 4.59 pushw $INITSEG 4.60 - popw %ss # %ss contain INITSEG 4.61 - pushw %ss 4.62 end_header: 4.63 - popw %es # %es = %ss = INITSEG 4.64 + cld # assume nothing 4.65 +#if defined(BZIMAGE) && BZIMAGE >= 0x202 4.66 + popw %es # %es contain INITSEG 4.67 + movw %es, %di 4.68 +#else 4.69 # cmdline offset at 0x22 4.70 movw $stacktop, %di # stacktop is an arbitrary value >= 4.71 # length of bootsect + length of 4.72 # setup + room for stack; 4.73 # 12 is disk parm size. 4.74 + popw %es # %es contain INITSEG 4.75 +#endif 4.76 + pushw %es 4.77 + popw %ss # %es = %ss = INITSEG 4.78 movw %di, %sp # put stack at INITSEG:stacktop-... 4.79 #ifdef EXE_SUPPORT 4.80 - cwd # %dx = 0 4.81 + cwd # force %dx = 0 (floppy only) 4.82 #endif 4.83 4.84 # Many BIOS's default disk parameter tables will not recognize 4.85 @@ -96,7 +111,6 @@ 4.86 # 4.87 # High doesn't hurt. Low does. Let's use the max: 63 4.88 4.89 - movw $zeroed/2, %cx # clear gdt + offset, %ds, limits 4.90 rep # don't worry about cld 4.91 stosw # already done above 4.92 popw %bx # offset = 0 4.93 @@ -135,6 +149,9 @@ 4.94 shrw $9-4, %di 4.95 incw %di 4.96 movw $SYSSEG, %cx 4.97 +#ifdef BZIMAGE 4.98 + push %cx 4.99 +#endif 4.100 call read_sectorsCX 4.101 4.102 # This procedure turns off the floppy drive motor, so 4.103 @@ -149,6 +166,45 @@ 4.104 # loaded directly after the bootblock: 4.105 # Segments are as follows: %ds = %ss = INITSEG 4.106 4.107 +#ifdef BZIMAGE 4.108 + popw %bx 4.109 + popw %si // SYSSEG:0 4.110 +movesys: // %bx = DS, %si 4.111 + movw $16, %ax 4.112 + mulw %bx 4.113 + addw %si, %ax 4.114 + adcw $0x9300, %dx // %dx:%ax src flat address 4.115 + movw $9, %cx 4.116 +zero1: 4.117 + pushw $0 // 2E..1E 4.118 + loop zero1 4.119 + //pushl $0x93100000 // 1A: dest 4.120 + pushw $0x9310 4.121 + pushw %cx 4.122 + pushw $-1 // 18 4.123 + pushw %cx // 16 4.124 + pushw %dx // src 4.125 + pushw %ax 4.126 + pushw $-1 // 10 4.127 + movb $8, %cl 4.128 + movw %cx, %bx // will move 8*64 = 512Kb 4.129 +zero2: 4.130 + pushw $0 // 0E..00 4.131 + loop zero2 4.132 + movw %sp, %si 4.133 + pushw %ss 4.134 + popw %es 4.135 + pushw %es 4.136 + popw %ds 4.137 +syslp: 4.138 + movb $0x80, %ch 4.139 + movb $0x87, %ah 4.140 + int $0x15 4.141 + incb 0x14(%si) 4.142 + incb 0x1C(%si) 4.143 + decw %bx 4.144 + jne syslp 4.145 +#endif 4.146 jmp_setup: 4.147 ljmp $SETUPSEG, $0 4.148 4.149 @@ -172,29 +228,32 @@ 4.150 movw $stacktop-4-16, %sp 4.151 popl 4(%si) 4.152 popaw 4.153 +#ifdef BZIMAGE 4.154 + jmp movesys 4.155 #endif 4.156 +#endif 4.157 +#ifndef BZIMAGE 4.158 movesys: // %ax = SYSSEG, %bx = DS, %si 4.159 - //movw %cs:syssize, %bp 4.160 - movw $0x8000, %bp 4.161 shrw $4, %si 4.162 addw %si, %bx 4.163 subw %ax, %bx 4.164 jnc forward 4.165 - addw %bp, %ax 4.166 + movb $0x90, %ah 4.167 + ;decw %ax 4.168 forward: 4.169 movw %ax, %es 4.170 - movw %ax, %dx 4.171 - addw %bx, %dx 4.172 - movw %dx, %ds 4.173 - sbbw %dx, %dx // %dx = 0 : -1 4.174 + movw %ax, %di 4.175 + addw %bx, %di 4.176 + movw %di, %ds 4.177 + sbbw %di, %di // %di = 0 : -1 4.178 cmc // C = 1 : 0 4.179 - adcw %dx, %ax 4.180 + adcw %di, %ax 4.181 xorw %si, %si 4.182 xorw %di, %di 4.183 - movb $8, %cl 4.184 + movb $0x10, %cl 4.185 + cmpb %cl, %ah // move 512k 4.186 rep 4.187 - movsw 4.188 - decw %bp 4.189 + movsb 4.190 jns forward 4.191 #ifndef NO_CURSOR_DEFINITION 4.192 movb $1, %ah 4.193 @@ -205,6 +264,7 @@ 4.194 pushw %ss 4.195 popw %ds 4.196 jmp jmp_setup 4.197 +#endif 4.198 comstart: 4.199 cld # assume nothing 4.200 pushw $INITSEG 4.201 @@ -216,7 +276,11 @@ 4.202 cbw 4.203 xchgw %ax, %cx 4.204 jcxz nocmdline 4.205 +# if defined(BZIMAGE) && BZIMAGE >= 0x202 4.206 + movw $INITSEG/16+stacktop/256, EXEADRS(cmd_line_ptr+1) 4.207 +# else 4.208 movw $0xA33F, 0x7F(%si) 4.209 +# endif 4.210 # ifndef NO_CMDLINE_SHRINK 4.211 skipspace: 4.212 lodsb 4.213 @@ -244,9 +308,18 @@ 4.214 rep 4.215 movsb 4.216 nocmdline: 4.217 + orb EXEADRS(setup_sects), %ch 4.218 +# ifndef NO_MINSETUP 4.219 +# ifndef BZIMAGE 4.220 + jnz setupok 4.221 + mov $4, %ch 4.222 +setupok: 4.223 +# endif 4.224 +# endif 4.225 +#else 4.226 + movb EXEADRS(setup_sects), %ch 4.227 #endif 4.228 movb $(512-(end_header-_start))/2, %cl 4.229 - movb EXEADRS(setup_sects), %ch 4.230 movw $0x100, %si 4.231 movw $end_header, %di 4.232 rep 4.233 @@ -260,19 +333,13 @@ 4.234 pushw $movesys 4.235 #endif 4.236 #ifdef VCPI 4.237 -# ifndef SHUTDOWNDOS 4.238 - pushw %es 4.239 - pushw %ds 4.240 -# endif 4.241 pushaw 4.242 smsww %ax 4.243 andb $1, %al 4.244 je isrm 4.245 movw $EXEADRS(gdt_vcpi),%si 4.246 - pushw $pagebuf/16 4.247 - popw %es 4.248 - movl $pagebuf+3,%es:0x1000 4.249 - xorw %di,%di 4.250 + movw $pagebuf-0x90000,%di // %es = 0x9000 4.251 + movl $pagebuf+3,%es:0x1000(%di) 4.252 call_vcpi: 4.253 movb $0xDE,%ah // DE01, EBX = getiface(DS:SI, ES:DI) 4.254 int $0x67 4.255 @@ -291,8 +358,6 @@ 4.256 # else 4.257 lssw %cs:EXEADRS(saved_ss_sp),%sp 4.258 popaw 4.259 - popw %ds 4.260 - popw %es 4.261 retf 4.262 # endif 4.263 #else 4.264 @@ -316,7 +381,6 @@ 4.265 #define FLOPPY_SECTORS 18 /* 18 sectors */ 4.266 #else 4.267 #define FLOPPY_HEADS 2 /* 2 heads minimum */ 4.268 -#define FLOPPY_SECTORS 9 /* 9 sectors minimum */ 4.269 #endif 4.270 4.271 return: 4.272 @@ -330,14 +394,9 @@ 4.273 check_limits: 4.274 #ifndef FLOPPY_1440K_ONLY 4.275 popw %dx 4.276 -#ifdef FLOPPY_SECTORS 4.277 - cmpb $FLOPPY_SECTORS+1, %cl # minimum sector count 4.278 - jb check_head 4.279 -#endif 4.280 cmpb %al, %cl # max sector known ? 4.281 ja next_head # no -> store it 4.282 #ifndef FLOPPY_HAS_2_SIDES 4.283 -check_head: 4.284 #ifdef FLOPPY_HEADS 4.285 cmpb $FLOPPY_HEADS, %dh # 2 heads minimum 4.286 jb check_cylinder