diff options
Diffstat (limited to 'qemu/roms/ipxe/src/arch/i386/image/bootsector.c')
| -rw-r--r-- | qemu/roms/ipxe/src/arch/i386/image/bootsector.c | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/qemu/roms/ipxe/src/arch/i386/image/bootsector.c b/qemu/roms/ipxe/src/arch/i386/image/bootsector.c deleted file mode 100644 index dba87613c..000000000 --- a/qemu/roms/ipxe/src/arch/i386/image/bootsector.c +++ /dev/null @@ -1,141 +0,0 @@ -/* - * Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of the - * License, or any later version. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - * - * You can also choose to distribute this program under the terms of - * the Unmodified Binary Distribution Licence (as given in the file - * COPYING.UBDL), provided that you have satisfied its requirements. - */ - -FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); - -/** - * @file - * - * x86 bootsector image format - * - */ - -#include <errno.h> -#include <realmode.h> -#include <biosint.h> -#include <bootsector.h> -#include <ipxe/console.h> - -/** Vector for storing original INT 18 handler - * - * We do not chain to this vector, so there is no need to place it in - * .text16. - */ -static struct segoff int18_vector; - -/** Vector for storing original INT 19 handler - * - * We do not chain to this vector, so there is no need to place it in - * .text16. - */ -static struct segoff int19_vector; - -/** Restart point for INT 18 or 19 */ -extern void bootsector_exec_fail ( void ); - -/** - * Jump to preloaded bootsector - * - * @v segment Real-mode segment - * @v offset Real-mode offset - * @v drive Drive number to pass to boot sector - * @ret rc Return status code - */ -int call_bootsector ( unsigned int segment, unsigned int offset, - unsigned int drive ) { - int discard_b, discard_D, discard_d; - - /* Reset console, since boot sector will probably use it */ - console_reset(); - - DBG ( "Booting from boot sector at %04x:%04x\n", segment, offset ); - - /* Hook INTs 18 and 19 to capture failure paths */ - hook_bios_interrupt ( 0x18, ( unsigned int ) bootsector_exec_fail, - &int18_vector ); - hook_bios_interrupt ( 0x19, ( unsigned int ) bootsector_exec_fail, - &int19_vector ); - - /* Boot the loaded sector - * - * We assume that the boot sector may completely destroy our - * real-mode stack, so we preserve everything we need in - * static storage. - */ - __asm__ __volatile__ ( REAL_CODE ( /* Save return address off-stack */ - "popw %%cs:saved_retaddr\n\t" - /* Save stack pointer */ - "movw %%ss, %%ax\n\t" - "movw %%ax, %%cs:saved_ss\n\t" - "movw %%sp, %%cs:saved_sp\n\t" - /* Save frame pointer (gcc bug) */ - "movl %%ebp, %%cs:saved_ebp\n\t" - /* Prepare jump to boot sector */ - "pushw %%bx\n\t" - "pushw %%di\n\t" - /* Clear all registers */ - "xorl %%eax, %%eax\n\t" - "xorl %%ebx, %%ebx\n\t" - "xorl %%ecx, %%ecx\n\t" - /* %edx contains drive number */ - "xorl %%esi, %%esi\n\t" - "xorl %%edi, %%edi\n\t" - "xorl %%ebp, %%ebp\n\t" - "movw %%ax, %%ds\n\t" - "movw %%ax, %%es\n\t" - "movw %%ax, %%fs\n\t" - "movw %%ax, %%gs\n\t" - /* Jump to boot sector */ - "sti\n\t" - "lret\n\t" - /* Preserved variables */ - "\nsaved_ebp: .long 0\n\t" - "\nsaved_ss: .word 0\n\t" - "\nsaved_sp: .word 0\n\t" - "\nsaved_retaddr: .word 0\n\t" - /* Boot failure return point */ - "\nbootsector_exec_fail:\n\t" - /* Restore frame pointer (gcc bug) */ - "movl %%cs:saved_ebp, %%ebp\n\t" - /* Restore stack pointer */ - "movw %%cs:saved_ss, %%ax\n\t" - "movw %%ax, %%ss\n\t" - "movw %%cs:saved_sp, %%sp\n\t" - /* Return via saved address */ - "jmp *%%cs:saved_retaddr\n\t" ) - : "=b" ( discard_b ), "=D" ( discard_D ), - "=d" ( discard_d ) - : "b" ( segment ), "D" ( offset ), - "d" ( drive ) - : "eax", "ecx", "esi" ); - - DBG ( "Booted disk returned via INT 18 or 19\n" ); - - /* Unhook INTs 18 and 19 */ - unhook_bios_interrupt ( 0x18, ( unsigned int ) bootsector_exec_fail, - &int18_vector ); - unhook_bios_interrupt ( 0x19, ( unsigned int ) bootsector_exec_fail, - &int19_vector ); - - return -ECANCELED; -} |