diff options
Diffstat (limited to 'contrib/syslinux/latest/mbr/gptmbr.S')
| -rw-r--r-- | contrib/syslinux/latest/mbr/gptmbr.S | 309 |
1 files changed, 0 insertions, 309 deletions
diff --git a/contrib/syslinux/latest/mbr/gptmbr.S b/contrib/syslinux/latest/mbr/gptmbr.S deleted file mode 100644 index 8ed4cf4..0000000 --- a/contrib/syslinux/latest/mbr/gptmbr.S +++ /dev/null @@ -1,309 +0,0 @@ -/* ----------------------------------------------------------------------- - * - * Copyright 2007-2009 H. Peter Anvin - All Rights Reserved - * Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin - * - * Permission is hereby granted, free of charge, to any person - * obtaining a copy of this software and associated documentation - * files (the "Software"), to deal in the Software without - * restriction, including without limitation the rights to use, - * copy, modify, merge, publish, distribute, sublicense, and/or - * sell copies of the Software, and to permit persons to whom - * the Software is furnished to do so, subject to the following - * conditions: - * - * The above copyright notice and this permission notice shall - * be included in all copies or substantial portions of the Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, - * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES - * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND - * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT - * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, - * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING - * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR - * OTHER DEALINGS IN THE SOFTWARE. - * - * ----------------------------------------------------------------------- */ - -#include "adjust.h" - - .code16 - .text - - .globl bootsec -stack = 0x7c00 - -/* Partition table header here */ -phdr = stack /* Above the stack, overwritten by bootsect */ -/* Partition table sector here */ -/* To handle > 32K we need to play segment tricks... */ -psec = _phdr + 512 - -/* Where we put DS:SI */ -dssi_out = _start + 0x1be - -BIOS_kbdflags = 0x417 -BIOS_page = 0x462 - - /* gas/ld has issues with doing this as absolute addresses... */ - .section ".bootsec", "a", @nobits - .globl bootsec -bootsec: - .space 512 - - .text - .globl _start -_start: - cli - xorw %ax, %ax - movw %ax, %ds - movw %ax, %ss - movw $stack, %sp - movw %sp, %si - pushw %es /* 4(%bp) es:di -> $PnP header */ - pushw %di /* 2(%bp) */ - movw %ax, %es - sti - cld - - /* Copy down to 0:0x600 */ - movw $_start, %di - movw $(512/2), %cx - rep; movsw - - ljmpw $0, $next -next: - - ADJUST_DRIVE - pushw %dx /* 0(%bp) = %dl -> drive number */ - - /* Check to see if we have EBIOS */ - pushw %dx /* drive number */ - movb $0x41, %ah /* %al == 0 already */ - movw $0x55aa, %bx - xorw %cx, %cx - xorb %dh, %dh - stc - int $0x13 - jc 1f - cmpw $0xaa55, %bx - jne 1f - shrw %cx /* Bit 0 = fixed disk subset */ - jnc 1f - - /* We have EBIOS; patch in the following code at - read_sector_cbios: movb $0x42, %ah ; jmp read_common */ - movl $0xeb42b4+((read_common-read_sector_cbios-4) << 24), \ - (read_sector_cbios) - -1: - popw %dx - - /* Get (C)HS geometry */ - movb $0x08, %ah - int $0x13 - andw $0x3f, %cx /* Sector count */ - movw %sp, %bp /* %bp -> frame pointer: LEAVE UNCHANGED */ - pushw %cx /* -2(%bp) Save sectors on the stack */ - movzbw %dh, %ax /* dh = max head */ - incw %ax /* From 0-based max to count */ - mulw %cx /* Heads*sectors -> sectors per cylinder */ - - /* Save sectors/cylinder on the stack */ - pushw %dx /* -4(%bp) High word */ - pushw %ax /* -6(%bp) Low word */ - - /* Load partition table header */ - xorl %eax,%eax - cltd - incw %ax /* %edx:%eax = 1 */ - movw $phdr, %bx - pushw %bx /* -8(%bp) phdr == bootsect */ - call read_sector - - /* Number of partition sectors */ - /* We assume the partition table is 32K or less, and that - the sector size is 512. */ - /* Note: phdr == 6(%bp) */ - movw (80+6)(%bp),%cx /* NumberOfPartitionEntries */ - movw (84+6)(%bp),%ax /* SizeOfPartitionEntry */ - pushw %ax - pushw %cx - mulw %cx - shrw $9,%ax - xchgw %ax,%cx - incw %cx - - /* Starting LBA of partition array */ - movl (72+6)(%bp),%eax - movl (76+6)(%bp),%edx - - pushw %bx -get_ptab: - call read_sector - call inc64 - loopw get_ptab - - /* Find the boot partition */ - xorw %si,%si /* Nothing found yet */ - popw %di /* Partition table in memory */ - popw %cx /* NumberOfPartitionEntries */ - popw %ax /* SizeOfPartitionEntry */ - -find_part: - /* If the PartitionTypeGUID is all zero, it's an empty slot */ - movl (%di),%edx - orl 4(%di),%edx - orl 8(%di),%edx - orl 12(%di),%edx - jz not_this - testb $0x04,48(%di) - jz not_this - andw %si,%si - jnz found_multiple - movw %di,%si -not_this: - addw %ax,%di - loopw find_part - - andw %si,%si - jnz found_part - -missing_os: - call error - .ascii "Missing OS\r\n" - -found_multiple: - call error - .ascii "Multiple active partitions\r\n" - -found_part: - xchgw %ax,%cx /* Set up %cx for rep movsb further down */ - - movw $dssi_out,%di - pushw %di - - /* 80 00 00 00 ee 00 00 00 - - bootable partition, type EFI (EE), no CHS information */ - xorl %eax,%eax - movb $0x80,%al - stosl - movb $0xed,%al - stosl - movl 32(%si),%eax - movl 36(%si),%edx - call saturate_stosl /* Partition start */ - - movl 40(%si),%eax - movl 44(%si),%edx - subl 32(%si),%eax - sbbl 36(%si),%edx - call inc64 - call saturate_stosl /* Partition length */ - - movzwl %cx,%eax /* Length of GPT entry */ - stosl - - rep; movsb /* GPT entry follows MBR entry */ - popw %si - -/* - * boot: invoke the actual bootstrap. %ds:%si points to the - * partition information in memory. The top word on the stack - * is phdr == 0x7c00 == the address of the boot sector. - */ -boot: - movl (32+20)(%si),%eax - movl (36+20)(%si),%edx - popw %bx - call read_sector - cmpw $0xaa55, -2(%bx) - jne missing_os /* Not a valid boot sector */ - movw %bp, %sp /* driveno == bootsec-6 */ - popw %dx /* dl -> drive number */ - popw %di /* es:di -> $PnP vector */ - popw %es - movl $0x54504721,%eax /* !GPT magic number */ - cli - jmpw *%sp /* %sp == bootsec */ - -/* - * Store the value in %eax to %di iff %edx == 0, otherwise store -1. - * Returns the value that was actually written in %eax. - */ -saturate_stosl: - andl %edx,%edx - jz 1f - orl $-1,%eax -1: stosl - ret - -/* - * Increment %edx:%eax - */ -inc64: - addl $1,%eax - adcl $0,%edx - ret - -/* - * read_sector: read a single sector pointed to by %edx:%eax to - * %es:%bx. CF is set on error. All registers saved. - */ -read_sector: - pushal - pushl %edx /* MSW of LBA */ - pushl %eax /* LSW of LBA */ - pushw %es /* Buffer segment */ - pushw %bx /* Buffer offset */ - pushw $1 /* Sector count */ - pushw $16 /* Size of packet */ - movw %sp, %si - - /* This chunk is skipped if we have ebios */ - /* Do not clobber %es:%bx or %edx:%eax before this chunk! */ -read_sector_cbios: - divl -6(%bp) /* secpercyl */ - shlb $6, %ah - movb %ah, %cl - movb %al, %ch - xchgw %dx, %ax - divb -2(%bp) /* sectors */ - movb %al, %dh - orb %ah, %cl - incw %cx /* Sectors are 1-based */ - movw $0x0201, %ax - -read_common: - movb (%bp), %dl /* driveno */ - int $0x13 - leaw 16(%si), %sp /* Drop DAPA */ - popal - jc disk_error - addb $2, %bh /* bx += 512: point to the next buffer */ - ret - -disk_error: - call error - .ascii "Disk error on boot\r\n" - -/* - * Print error messages. This is invoked with "call", with the - * error message at the return address. - */ -error: - popw %si -2: - lodsb - movb $0x0e, %ah - movb (BIOS_page), %bh - movb $0x07, %bl - int $0x10 /* May destroy %bp */ - cmpb $10, %al /* Newline? */ - jne 2b - - int $0x18 /* Boot failure */ -die: - hlt - jmp die |