diff options
Diffstat (limited to 'gpxe/src/arch/i386/interface/syslinux/comboot_call.c')
| -rw-r--r-- | gpxe/src/arch/i386/interface/syslinux/comboot_call.c | 716 |
1 files changed, 0 insertions, 716 deletions
diff --git a/gpxe/src/arch/i386/interface/syslinux/comboot_call.c b/gpxe/src/arch/i386/interface/syslinux/comboot_call.c deleted file mode 100644 index 0a17bf13..00000000 --- a/gpxe/src/arch/i386/interface/syslinux/comboot_call.c +++ /dev/null @@ -1,716 +0,0 @@ -/* - * Copyright (C) 2008 Daniel Verkamp <daniel@drv.nu>. - * - * 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., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -/** - * @file SYSLINUX COMBOOT API - * - */ - -FILE_LICENCE ( GPL2_OR_LATER ); - -#include <errno.h> -#include <realmode.h> -#include <biosint.h> -#include <console.h> -#include <stdlib.h> -#include <comboot.h> -#include <bzimage.h> -#include <pxe_call.h> -#include <setjmp.h> -#include <string.h> -#include <gpxe/posix_io.h> -#include <gpxe/process.h> -#include <gpxe/serial.h> -#include <gpxe/init.h> -#include <gpxe/image.h> -#include <usr/imgmgmt.h> -#include "config/console.h" -#include "config/serial.h" - -/** The "SYSLINUX" version string */ -static char __data16_array ( syslinux_version, [] ) = "gPXE " VERSION; -#define syslinux_version __use_data16 ( syslinux_version ) - -/** The "SYSLINUX" copyright string */ -static char __data16_array ( syslinux_copyright, [] ) = "http://etherboot.org"; -#define syslinux_copyright __use_data16 ( syslinux_copyright ) - -static char __data16_array ( syslinux_configuration_file, [] ) = ""; -#define syslinux_configuration_file __use_data16 ( syslinux_configuration_file ) - -/** Feature flags */ -static uint8_t __data16 ( comboot_feature_flags ) = COMBOOT_FEATURE_IDLE_LOOP; -#define comboot_feature_flags __use_data16 ( comboot_feature_flags ) - -typedef union { - syslinux_pm_regs pm; syslinux_rm_regs rm; -} syslinux_regs; - -/** Initial register values for INT 22h AX=1Ah and 1Bh */ -static syslinux_regs __text16 ( comboot_initial_regs ); -#define comboot_initial_regs __use_text16 ( comboot_initial_regs ) - -static struct segoff __text16 ( int20_vector ); -#define int20_vector __use_text16 ( int20_vector ) - -static struct segoff __text16 ( int21_vector ); -#define int21_vector __use_text16 ( int21_vector ) - -static struct segoff __text16 ( int22_vector ); -#define int22_vector __use_text16 ( int22_vector ) - -extern void int20_wrapper ( void ); -extern void int21_wrapper ( void ); -extern void int22_wrapper ( void ); - -/* setjmp/longjmp context buffer used to return after loading an image */ -rmjmp_buf comboot_return; - -/* Replacement image when exiting with COMBOOT_EXIT_RUN_KERNEL */ -struct image *comboot_replacement_image; - -/* Mode flags set by INT 22h AX=0017h */ -static uint16_t comboot_graphics_mode = 0; - - -/** - * Print a string with a particular terminator - */ -static void print_user_string ( unsigned int segment, unsigned int offset, char terminator ) { - int i = 0; - char c; - userptr_t str = real_to_user ( segment, offset ); - for ( ; ; ) { - copy_from_user ( &c, str, i, 1 ); - if ( c == terminator ) break; - putchar ( c ); - i++; - } -} - - -/** - * Perform a series of memory copies from a list in low memory - */ -static void shuffle ( unsigned int list_segment, unsigned int list_offset, unsigned int count ) -{ - comboot_shuffle_descriptor shuf[COMBOOT_MAX_SHUFFLE_DESCRIPTORS]; - unsigned int i; - - /* Copy shuffle descriptor list so it doesn't get overwritten */ - copy_from_user ( shuf, real_to_user ( list_segment, list_offset ), 0, - count * sizeof( comboot_shuffle_descriptor ) ); - - /* Do the copies */ - for ( i = 0; i < count; i++ ) { - userptr_t src_u = phys_to_user ( shuf[ i ].src ); - userptr_t dest_u = phys_to_user ( shuf[ i ].dest ); - - if ( shuf[ i ].src == 0xFFFFFFFF ) { - /* Fill with 0 instead of copying */ - memset_user ( dest_u, 0, 0, shuf[ i ].len ); - } else if ( shuf[ i ].dest == 0xFFFFFFFF ) { - /* Copy new list of descriptors */ - count = shuf[ i ].len / sizeof( comboot_shuffle_descriptor ); - assert ( count <= COMBOOT_MAX_SHUFFLE_DESCRIPTORS ); - copy_from_user ( shuf, src_u, 0, shuf[ i ].len ); - i = -1; - } else { - /* Regular copy */ - memmove_user ( dest_u, 0, src_u, 0, shuf[ i ].len ); - } - } -} - - -/** - * Set default text mode - */ -void comboot_force_text_mode ( void ) { - if ( comboot_graphics_mode & COMBOOT_VIDEO_VESA ) { - /* Set VGA mode 3 via VESA VBE mode set */ - __asm__ __volatile__ ( - REAL_CODE ( - "mov $0x4F02, %%ax\n\t" - "mov $0x03, %%bx\n\t" - "int $0x10\n\t" - ) - : : ); - } else if ( comboot_graphics_mode & COMBOOT_VIDEO_GRAPHICS ) { - /* Set VGA mode 3 via standard VGA mode set */ - __asm__ __volatile__ ( - REAL_CODE ( - "mov $0x03, %%ax\n\t" - "int $0x10\n\t" - ) - : : ); - } - - comboot_graphics_mode = 0; -} - - -/** - * Fetch kernel and optional initrd - */ -static int comboot_fetch_kernel ( char *kernel_file, char *cmdline ) { - struct image *kernel = NULL; - struct image *initrd = NULL; - char *initrd_file; - int rc; - - /* Find initrd= parameter, if any */ - if ( ( initrd_file = strstr ( cmdline, "initrd=" ) ) != NULL ) { - char *initrd_end; - - /* skip "initrd=" */ - initrd_file += 7; - - /* Find terminating space, if any, and replace with NUL */ - initrd_end = strchr ( initrd_file, ' ' ); - if ( initrd_end ) - *initrd_end = '\0'; - - DBG ( "COMBOOT: fetching initrd '%s'\n", initrd_file ); - - /* Allocate and fetch initrd */ - initrd = alloc_image(); - if ( ! initrd ) { - DBG ( "COMBOOT: could not allocate initrd\n" ); - rc = -ENOMEM; - goto out; - } - if ( ( rc = imgfetch ( initrd, initrd_file, - register_image ) ) != 0 ) { - DBG ( "COMBOOT: could not fetch initrd: %s\n", - strerror ( rc ) ); - goto out; - } - - /* Restore space after initrd name, if applicable */ - if ( initrd_end ) - *initrd_end = ' '; - } - - DBG ( "COMBOOT: fetching kernel '%s'\n", kernel_file ); - - /* Allocate and fetch kernel */ - kernel = alloc_image(); - if ( ! kernel ) { - DBG ( "COMBOOT: could not allocate kernel\n" ); - rc = -ENOMEM; - goto out; - } - if ( ( rc = imgfetch ( kernel, kernel_file, - register_image ) ) != 0 ) { - DBG ( "COMBOOT: could not fetch kernel: %s\n", - strerror ( rc ) ); - goto out; - } - if ( ( rc = image_set_cmdline ( kernel, cmdline ) ) != 0 ) { - DBG ( "COMBOOT: could not set kernel command line: %s\n", - strerror ( rc ) ); - goto out; - } - - /* Store kernel as replacement image */ - assert ( comboot_replacement_image == NULL ); - comboot_replacement_image = image_get ( kernel ); - - out: - /* Drop image references unconditionally; either we want to - * discard them, or they have been registered and we should - * drop out local reference. - */ - image_put ( kernel ); - image_put ( initrd ); - return rc; -} - - -/** - * Terminate program interrupt handler - */ -static __asmcall void int20 ( struct i386_all_regs *ix86 __unused ) { - rmlongjmp ( comboot_return, COMBOOT_EXIT ); -} - - -/** - * DOS-compatible API - */ -static __asmcall void int21 ( struct i386_all_regs *ix86 ) { - ix86->flags |= CF; - - switch ( ix86->regs.ah ) { - case 0x00: - case 0x4C: /* Terminate program */ - rmlongjmp ( comboot_return, COMBOOT_EXIT ); - break; - - case 0x01: /* Get Key with Echo */ - case 0x08: /* Get Key without Echo */ - /* TODO: handle extended characters? */ - ix86->regs.al = getchar( ); - - /* Enter */ - if ( ix86->regs.al == 0x0A ) - ix86->regs.al = 0x0D; - - if ( ix86->regs.ah == 0x01 ) - putchar ( ix86->regs.al ); - - ix86->flags &= ~CF; - break; - - case 0x02: /* Write Character */ - putchar ( ix86->regs.dl ); - ix86->flags &= ~CF; - break; - - case 0x04: /* Write Character to Serial Port */ - serial_putc ( ix86->regs.dl ); - ix86->flags &= ~CF; - break; - - case 0x09: /* Write DOS String to Console */ - print_user_string ( ix86->segs.ds, ix86->regs.dx, '$' ); - ix86->flags &= ~CF; - break; - - case 0x0B: /* Check Keyboard */ - if ( iskey() ) - ix86->regs.al = 0xFF; - else - ix86->regs.al = 0x00; - - ix86->flags &= ~CF; - break; - - case 0x30: /* Check DOS Version */ - /* Bottom halves all 0; top halves spell "SYSLINUX" */ - ix86->regs.eax = 0x59530000; - ix86->regs.ebx = 0x4C530000; - ix86->regs.ecx = 0x4E490000; - ix86->regs.edx = 0x58550000; - ix86->flags &= ~CF; - break; - - default: - DBG ( "COMBOOT unknown int21 function %02x\n", ix86->regs.ah ); - break; - } -} - - -/** - * SYSLINUX API - */ -static __asmcall void int22 ( struct i386_all_regs *ix86 ) { - ix86->flags |= CF; - - switch ( ix86->regs.ax ) { - case 0x0001: /* Get Version */ - - /* Number of INT 22h API functions available */ - ix86->regs.ax = 0x001D; - - /* SYSLINUX version number */ - ix86->regs.ch = 0; /* major */ - ix86->regs.cl = 0; /* minor */ - - /* SYSLINUX derivative ID */ - ix86->regs.dl = BZI_LOADER_TYPE_GPXE; - - /* SYSLINUX version and copyright strings */ - ix86->segs.es = rm_ds; - ix86->regs.si = ( ( unsigned ) __from_data16 ( syslinux_version ) ); - ix86->regs.di = ( ( unsigned ) __from_data16 ( syslinux_copyright ) ); - - ix86->flags &= ~CF; - break; - - case 0x0002: /* Write String */ - print_user_string ( ix86->segs.es, ix86->regs.bx, '\0' ); - ix86->flags &= ~CF; - break; - - case 0x0003: /* Run command */ - { - userptr_t cmd_u = real_to_user ( ix86->segs.es, ix86->regs.bx ); - int len = strlen_user ( cmd_u, 0 ); - char cmd[len + 1]; - copy_from_user ( cmd, cmd_u, 0, len + 1 ); - DBG ( "COMBOOT: executing command '%s'\n", cmd ); - system ( cmd ); - DBG ( "COMBOOT: exiting after executing command...\n" ); - rmlongjmp ( comboot_return, COMBOOT_EXIT_COMMAND ); - } - break; - - case 0x0004: /* Run default command */ - /* FIXME: just exit for now */ - rmlongjmp ( comboot_return, COMBOOT_EXIT_COMMAND ); - break; - - case 0x0005: /* Force text mode */ - comboot_force_text_mode ( ); - ix86->flags &= ~CF; - break; - - case 0x0006: /* Open file */ - { - int fd; - userptr_t file_u = real_to_user ( ix86->segs.es, ix86->regs.si ); - int len = strlen_user ( file_u, 0 ); - char file[len + 1]; - - copy_from_user ( file, file_u, 0, len + 1 ); - - if ( file[0] == '\0' ) { - DBG ( "COMBOOT: attempted open with empty file name\n" ); - break; - } - - DBG ( "COMBOOT: opening file '%s'\n", file ); - - fd = open ( file ); - - if ( fd < 0 ) { - DBG ( "COMBOOT: error opening file %s\n", file ); - break; - } - - /* This relies on the fact that a gPXE POSIX fd will - * always fit in 16 bits. - */ -#if (POSIX_FD_MAX > 65535) -#error POSIX_FD_MAX too large -#endif - ix86->regs.si = (uint16_t) fd; - - ix86->regs.cx = COMBOOT_FILE_BLOCKSZ; - ix86->regs.eax = fsize ( fd ); - ix86->flags &= ~CF; - } - break; - - case 0x0007: /* Read file */ - { - int fd = ix86->regs.si; - int len = ix86->regs.cx * COMBOOT_FILE_BLOCKSZ; - int rc; - fd_set fds; - userptr_t buf = real_to_user ( ix86->segs.es, ix86->regs.bx ); - - /* Wait for data ready to read */ - FD_ZERO ( &fds ); - FD_SET ( fd, &fds ); - - select ( &fds, 1 ); - - rc = read_user ( fd, buf, 0, len ); - if ( rc < 0 ) { - DBG ( "COMBOOT: read failed\n" ); - ix86->regs.si = 0; - break; - } - - ix86->regs.ecx = rc; - ix86->flags &= ~CF; - } - break; - - case 0x0008: /* Close file */ - { - int fd = ix86->regs.si; - close ( fd ); - ix86->flags &= ~CF; - } - break; - - case 0x0009: /* Call PXE Stack */ - if ( pxe_api_call_weak ( ix86 ) != 0 ) - ix86->flags |= CF; - else - ix86->flags &= ~CF; - break; - - case 0x000A: /* Get Derivative-Specific Information */ - - /* gPXE has its own derivative ID, so there is no defined - * output here; just return AL for now */ - ix86->regs.al = BZI_LOADER_TYPE_GPXE; - ix86->flags &= ~CF; - break; - - case 0x000B: /* Get Serial Console Configuration */ -#if defined(CONSOLE_SERIAL) && !defined(COMPRESERVE) - ix86->regs.dx = COMCONSOLE; - ix86->regs.cx = 115200 / COMSPEED; - ix86->regs.bx = 0; -#else - ix86->regs.dx = 0; -#endif - - ix86->flags &= ~CF; - break; - - case 0x000E: /* Get configuration file name */ - /* FIXME: stub */ - ix86->segs.es = rm_ds; - ix86->regs.bx = ( ( unsigned ) __from_data16 ( syslinux_configuration_file ) ); - ix86->flags &= ~CF; - break; - - case 0x000F: /* Get IPAPPEND strings */ - /* FIXME: stub */ - ix86->regs.cx = 0; - ix86->segs.es = 0; - ix86->regs.bx = 0; - ix86->flags &= ~CF; - break; - - case 0x0010: /* Resolve hostname */ - { - userptr_t hostname_u = real_to_user ( ix86->segs.es, ix86->regs.bx ); - int len = strlen_user ( hostname_u, 0 ); - char hostname[len]; - struct in_addr addr; - - copy_from_user ( hostname, hostname_u, 0, len + 1 ); - - /* TODO: - * "If the hostname does not contain a dot (.), the - * local domain name is automatically appended." - */ - - comboot_resolv ( hostname, &addr ); - - ix86->regs.eax = addr.s_addr; - ix86->flags &= ~CF; - } - break; - - case 0x0011: /* Maximum number of shuffle descriptors */ - ix86->regs.cx = COMBOOT_MAX_SHUFFLE_DESCRIPTORS; - ix86->flags &= ~CF; - break; - - case 0x0012: /* Cleanup, shuffle and boot */ - if ( ix86->regs.cx > COMBOOT_MAX_SHUFFLE_DESCRIPTORS ) - break; - - /* Perform final cleanup */ - shutdown ( SHUTDOWN_BOOT ); - - /* Perform sequence of copies */ - shuffle ( ix86->segs.es, ix86->regs.di, ix86->regs.cx ); - - /* Jump to real-mode entry point */ - __asm__ __volatile__ ( - REAL_CODE ( - "pushw %0\n\t" - "popw %%ds\n\t" - "pushl %1\n\t" - "lret\n\t" - ) - : - : "r" ( ix86->segs.ds ), - "r" ( ix86->regs.ebp ), - "d" ( ix86->regs.ebx ), - "S" ( ix86->regs.esi ) ); - - assert ( 0 ); /* Execution should never reach this point */ - - break; - - case 0x0013: /* Idle loop call */ - step ( ); - ix86->flags &= ~CF; - break; - - case 0x0015: /* Get feature flags */ - ix86->segs.es = rm_ds; - ix86->regs.bx = ( ( unsigned ) __from_data16 ( &comboot_feature_flags ) ); - ix86->regs.cx = 1; /* Number of feature flag bytes */ - ix86->flags &= ~CF; - break; - - case 0x0016: /* Run kernel image */ - { - userptr_t file_u = real_to_user ( ix86->segs.ds, ix86->regs.si ); - userptr_t cmd_u = real_to_user ( ix86->segs.es, ix86->regs.bx ); - int file_len = strlen_user ( file_u, 0 ); - int cmd_len = strlen_user ( cmd_u, 0 ); - char file[file_len + 1]; - char cmd[cmd_len + 1]; - - copy_from_user ( file, file_u, 0, file_len + 1 ); - copy_from_user ( cmd, cmd_u, 0, cmd_len + 1 ); - - DBG ( "COMBOOT: run kernel %s %s\n", file, cmd ); - comboot_fetch_kernel ( file, cmd ); - /* Technically, we should return if we - * couldn't load the kernel, but it's not safe - * to do that since we have just overwritten - * part of the COMBOOT program's memory space. - */ - DBG ( "COMBOOT: exiting to run kernel...\n" ); - rmlongjmp ( comboot_return, COMBOOT_EXIT_RUN_KERNEL ); - } - break; - - case 0x0017: /* Report video mode change */ - comboot_graphics_mode = ix86->regs.bx; - ix86->flags &= ~CF; - break; - - case 0x0018: /* Query custom font */ - /* FIXME: stub */ - ix86->regs.al = 0; - ix86->segs.es = 0; - ix86->regs.bx = 0; - ix86->flags &= ~CF; - break; - - case 0x001B: /* Cleanup, shuffle and boot to real mode */ - if ( ix86->regs.cx > COMBOOT_MAX_SHUFFLE_DESCRIPTORS ) - break; - - /* Perform final cleanup */ - shutdown ( SHUTDOWN_BOOT ); - - /* Perform sequence of copies */ - shuffle ( ix86->segs.es, ix86->regs.di, ix86->regs.cx ); - - /* Copy initial register values to .text16 */ - memcpy_user ( real_to_user ( rm_cs, (unsigned) __from_text16 ( &comboot_initial_regs ) ), 0, - real_to_user ( ix86->segs.ds, ix86->regs.si ), 0, - sizeof(syslinux_rm_regs) ); - - /* Load initial register values */ - __asm__ __volatile__ ( - REAL_CODE ( - /* Point SS:SP at the register value structure */ - "pushw %%cs\n\t" - "popw %%ss\n\t" - "movw $comboot_initial_regs, %%sp\n\t" - - /* Segment registers */ - "popw %%es\n\t" - "popw %%ax\n\t" /* Skip CS */ - "popw %%ds\n\t" - "popw %%ax\n\t" /* Skip SS for now */ - "popw %%fs\n\t" - "popw %%gs\n\t" - - /* GP registers */ - "popl %%eax\n\t" - "popl %%ecx\n\t" - "popl %%edx\n\t" - "popl %%ebx\n\t" - "popl %%ebp\n\t" /* Skip ESP for now */ - "popl %%ebp\n\t" - "popl %%esi\n\t" - "popl %%edi\n\t" - - /* Load correct SS:ESP */ - "movw $(comboot_initial_regs + 6), %%sp\n\t" - "popw %%ss\n\t" - "movl %%cs:(comboot_initial_regs + 28), %%esp\n\t" - - "ljmp *%%cs:(comboot_initial_regs + 44)\n\t" - ) - : : ); - - break; - - case 0x001C: /* Get pointer to auxilliary data vector */ - /* FIXME: stub */ - ix86->regs.cx = 0; /* Size of the ADV */ - ix86->flags &= ~CF; - break; - - case 0x001D: /* Write auxilliary data vector */ - /* FIXME: stub */ - ix86->flags &= ~CF; - break; - - default: - DBG ( "COMBOOT unknown int22 function %04x\n", ix86->regs.ax ); - break; - } -} - -/** - * Hook BIOS interrupts related to COMBOOT API (INT 20h, 21h, 22h) - */ -void hook_comboot_interrupts ( ) { - - __asm__ __volatile__ ( - TEXT16_CODE ( "\nint20_wrapper:\n\t" - "pushl %0\n\t" - "pushw %%cs\n\t" - "call prot_call\n\t" - "addw $4, %%sp\n\t" - "iret\n\t" ) - : : "i" ( int20 ) ); - - hook_bios_interrupt ( 0x20, ( unsigned int ) int20_wrapper, - &int20_vector ); - - __asm__ __volatile__ ( - TEXT16_CODE ( "\nint21_wrapper:\n\t" - "pushl %0\n\t" - "pushw %%cs\n\t" - "call prot_call\n\t" - "addw $4, %%sp\n\t" - "iret\n\t" ) - : : "i" ( int21 ) ); - - hook_bios_interrupt ( 0x21, ( unsigned int ) int21_wrapper, - &int21_vector ); - - __asm__ __volatile__ ( - TEXT16_CODE ( "\nint22_wrapper:\n\t" - "pushl %0\n\t" - "pushw %%cs\n\t" - "call prot_call\n\t" - "addw $4, %%sp\n\t" - "iret\n\t" ) - : : "i" ( int22) ); - - hook_bios_interrupt ( 0x22, ( unsigned int ) int22_wrapper, - &int22_vector ); -} - -/** - * Unhook BIOS interrupts related to COMBOOT API (INT 20h, 21h, 22h) - */ -void unhook_comboot_interrupts ( ) { - - unhook_bios_interrupt ( 0x20, ( unsigned int ) int20_wrapper, - &int20_vector ); - - unhook_bios_interrupt ( 0x21, ( unsigned int ) int21_wrapper, - &int21_vector ); - - unhook_bios_interrupt ( 0x22, ( unsigned int ) int22_wrapper, - &int22_vector ); -} |