![Michael Brown](/assets/img/avatar_default.png)
Add yet another ugly hack to iscsiboot.c, this time to allow the user to inhibit the shutdown/removal of the iSCSI INT13 device (and the network devices, since they are required for the iSCSI device to function). On the plus side, the fact that shutdown() now takes flags to differentiate between shutdown-for-exit and shutdown-for-boot means that another ugly hack (to allow returning via the PXE stack on BIOSes that have broken INT 18 calls) will be easier. I feel dirty.
577 lines
16 KiB
C
577 lines
16 KiB
C
/*
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* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/**
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* @file
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*
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* Linux bzImage image format
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*
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include <realmode.h>
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#include <bzimage.h>
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#include <gpxe/uaccess.h>
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#include <gpxe/image.h>
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#include <gpxe/segment.h>
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#include <gpxe/init.h>
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#include <gpxe/cpio.h>
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#include <gpxe/features.h>
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FEATURE ( FEATURE_IMAGE, "bzImage", DHCP_EB_FEATURE_BZIMAGE, 1 );
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struct image_type bzimage_image_type __image_type ( PROBE_NORMAL );
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/**
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* bzImage load context
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*/
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struct bzimage_load_context {
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/** Real-mode kernel portion load segment address */
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unsigned int rm_kernel_seg;
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/** Real-mode kernel portion load address */
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userptr_t rm_kernel;
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/** Real-mode kernel portion file size */
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size_t rm_filesz;
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/** Real-mode heap top (offset from rm_kernel) */
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size_t rm_heap;
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/** Command line (offset from rm_kernel) */
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size_t rm_cmdline;
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/** Real-mode kernel portion total memory size */
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size_t rm_memsz;
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/** Non-real-mode kernel portion load address */
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userptr_t pm_kernel;
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/** Non-real-mode kernel portion file and memory size */
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size_t pm_sz;
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};
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/**
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* bzImage execution context
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*/
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struct bzimage_exec_context {
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/** Real-mode kernel portion load segment address */
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unsigned int rm_kernel_seg;
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/** Real-mode kernel portion load address */
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userptr_t rm_kernel;
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/** Real-mode heap top (offset from rm_kernel) */
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size_t rm_heap;
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/** Command line (offset from rm_kernel) */
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size_t rm_cmdline;
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/** Command line maximum length */
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size_t cmdline_size;
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/** Video mode */
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unsigned int vid_mode;
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/** Memory limit */
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uint64_t mem_limit;
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/** Initrd address */
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physaddr_t ramdisk_image;
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/** Initrd size */
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physaddr_t ramdisk_size;
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};
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/**
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* Parse kernel command line for bootloader parameters
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*
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* @v image bzImage file
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* @v exec_ctx Execution context
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* @v cmdline Kernel command line
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* @ret rc Return status code
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*/
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static int bzimage_parse_cmdline ( struct image *image,
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struct bzimage_exec_context *exec_ctx,
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const char *cmdline ) {
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char *vga;
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char *mem;
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/* Look for "vga=" */
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if ( ( vga = strstr ( cmdline, "vga=" ) ) ) {
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vga += 4;
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if ( strcmp ( vga, "normal" ) == 0 ) {
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exec_ctx->vid_mode = BZI_VID_MODE_NORMAL;
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} else if ( strcmp ( vga, "ext" ) == 0 ) {
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exec_ctx->vid_mode = BZI_VID_MODE_EXT;
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} else if ( strcmp ( vga, "ask" ) == 0 ) {
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exec_ctx->vid_mode = BZI_VID_MODE_ASK;
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} else {
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exec_ctx->vid_mode = strtoul ( vga, &vga, 0 );
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if ( *vga && ( *vga != ' ' ) ) {
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DBGC ( image, "bzImage %p strange \"vga=\""
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"terminator '%c'\n", image, *vga );
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}
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}
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}
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/* Look for "mem=" */
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if ( ( mem = strstr ( cmdline, "mem=" ) ) ) {
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mem += 4;
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exec_ctx->mem_limit = strtoul ( mem, &mem, 0 );
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switch ( *mem ) {
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case 'G':
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case 'g':
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exec_ctx->mem_limit <<= 10;
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case 'M':
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case 'm':
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exec_ctx->mem_limit <<= 10;
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case 'K':
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case 'k':
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exec_ctx->mem_limit <<= 10;
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break;
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case '\0':
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case ' ':
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break;
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default:
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DBGC ( image, "bzImage %p strange \"mem=\" "
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"terminator '%c'\n", image, *mem );
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break;
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}
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exec_ctx->mem_limit -= 1;
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}
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return 0;
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}
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/**
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* Set command line
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*
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* @v image bzImage image
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* @v exec_ctx Execution context
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* @v cmdline Kernel command line
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* @ret rc Return status code
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*/
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static int bzimage_set_cmdline ( struct image *image,
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struct bzimage_exec_context *exec_ctx,
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const char *cmdline ) {
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size_t cmdline_len;
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/* Copy command line down to real-mode portion */
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cmdline_len = ( strlen ( cmdline ) + 1 );
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if ( cmdline_len > exec_ctx->cmdline_size )
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cmdline_len = exec_ctx->cmdline_size;
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copy_to_user ( exec_ctx->rm_kernel, exec_ctx->rm_cmdline,
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cmdline, cmdline_len );
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DBGC ( image, "bzImage %p command line \"%s\"\n", image, cmdline );
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return 0;
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}
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/**
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* Load initrd
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*
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* @v image bzImage image
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* @v initrd initrd image
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* @v address Address at which to load, or UNULL
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* @ret len Length of loaded image, rounded up to 4 bytes
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*/
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static size_t bzimage_load_initrd ( struct image *image,
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struct image *initrd,
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userptr_t address ) {
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char *filename = initrd->cmdline;
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struct cpio_header cpio;
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size_t offset = 0;
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/* Do not include kernel image itself as an initrd */
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if ( initrd == image )
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return 0;
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/* Create cpio header before non-prebuilt images */
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if ( filename && filename[0] ) {
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size_t name_len = ( strlen ( filename ) + 1 );
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DBGC ( image, "bzImage %p inserting initrd %p as %s\n",
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image, initrd, filename );
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memset ( &cpio, '0', sizeof ( cpio ) );
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memcpy ( cpio.c_magic, CPIO_MAGIC, sizeof ( cpio.c_magic ) );
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cpio_set_field ( cpio.c_mode, 0100644 );
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cpio_set_field ( cpio.c_nlink, 1 );
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cpio_set_field ( cpio.c_filesize, initrd->len );
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cpio_set_field ( cpio.c_namesize, name_len );
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if ( address ) {
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copy_to_user ( address, offset, &cpio,
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sizeof ( cpio ) );
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}
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offset += sizeof ( cpio );
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if ( address ) {
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copy_to_user ( address, offset, filename,
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name_len );
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}
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offset += name_len;
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offset = ( ( offset + 0x03 ) & ~0x03 );
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}
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/* Copy in initrd image body */
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if ( address ) {
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DBGC ( image, "bzImage %p has initrd %p at [%lx,%lx)\n",
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image, initrd, address, ( address + offset ) );
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memcpy_user ( address, offset, initrd->data, 0,
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initrd->len );
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}
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offset += initrd->len;
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offset = ( ( offset + 0x03 ) & ~0x03 );
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return offset;
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}
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/**
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* Load initrds, if any
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*
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* @v image bzImage image
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* @v exec_ctx Execution context
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* @ret rc Return status code
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*/
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static int bzimage_load_initrds ( struct image *image,
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struct bzimage_exec_context *exec_ctx ) {
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struct image *initrd;
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size_t total_len = 0;
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physaddr_t address;
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int rc;
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/* Add up length of all initrd images */
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for_each_image ( initrd ) {
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total_len += bzimage_load_initrd ( image, initrd, UNULL );
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}
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/* Give up if no initrd images found */
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if ( ! total_len )
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return 0;
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/* Find a suitable start address. Try 1MB boundaries,
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* starting from the downloaded kernel image itself and
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* working downwards until we hit an available region.
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*/
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for ( address = ( user_to_phys ( image->data, 0 ) & ~0xfffff ) ; ;
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address -= 0x100000 ) {
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/* Check that we're not going to overwrite the
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* kernel itself. This check isn't totally
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* accurate, but errs on the side of caution.
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*/
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if ( address <= ( BZI_LOAD_HIGH_ADDR + image->len ) ) {
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DBGC ( image, "bzImage %p could not find a location "
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"for initrd\n", image );
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return -ENOBUFS;
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}
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/* Check that we are within the kernel's range */
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if ( ( address + total_len - 1 ) > exec_ctx->mem_limit )
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continue;
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/* Prepare and verify segment */
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if ( ( rc = prep_segment ( phys_to_user ( address ), 0,
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total_len ) ) != 0 )
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continue;
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/* Use this address */
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break;
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}
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/* Record initrd location */
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exec_ctx->ramdisk_image = address;
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exec_ctx->ramdisk_size = total_len;
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/* Construct initrd */
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DBGC ( image, "bzImage %p constructing initrd at [%lx,%lx)\n",
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image, address, ( address + total_len ) );
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for_each_image ( initrd ) {
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address += bzimage_load_initrd ( image, initrd,
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phys_to_user ( address ) );
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}
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return 0;
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}
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/**
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* Execute bzImage image
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*
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* @v image bzImage image
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* @ret rc Return status code
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*/
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static int bzimage_exec ( struct image *image ) {
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struct bzimage_exec_context exec_ctx;
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struct bzimage_header bzhdr;
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const char *cmdline = ( image->cmdline ? image->cmdline : "" );
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int rc;
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/* Initialise context */
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memset ( &exec_ctx, 0, sizeof ( exec_ctx ) );
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/* Retrieve kernel header */
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exec_ctx.rm_kernel_seg = image->priv.ul;
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exec_ctx.rm_kernel = real_to_user ( exec_ctx.rm_kernel_seg, 0 );
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copy_from_user ( &bzhdr, exec_ctx.rm_kernel, BZI_HDR_OFFSET,
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sizeof ( bzhdr ) );
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exec_ctx.rm_cmdline = exec_ctx.rm_heap =
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( bzhdr.heap_end_ptr + 0x200 );
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exec_ctx.vid_mode = bzhdr.vid_mode;
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if ( bzhdr.version >= 0x0203 ) {
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exec_ctx.mem_limit = bzhdr.initrd_addr_max;
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} else {
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exec_ctx.mem_limit = BZI_INITRD_MAX;
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}
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if ( bzhdr.version >= 0x0206 ) {
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exec_ctx.cmdline_size = bzhdr.cmdline_size;
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} else {
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exec_ctx.cmdline_size = BZI_CMDLINE_SIZE;
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}
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DBG ( "cmdline_size = %zd\n", exec_ctx.cmdline_size );
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/* Parse command line for bootloader parameters */
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if ( ( rc = bzimage_parse_cmdline ( image, &exec_ctx, cmdline ) ) != 0)
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return rc;
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/* Store command line */
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if ( ( rc = bzimage_set_cmdline ( image, &exec_ctx, cmdline ) ) != 0 )
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return rc;
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/* Load any initrds */
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if ( ( rc = bzimage_load_initrds ( image, &exec_ctx ) ) != 0 )
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return rc;
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/* Update and store kernel header */
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bzhdr.vid_mode = exec_ctx.vid_mode;
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bzhdr.ramdisk_image = exec_ctx.ramdisk_image;
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bzhdr.ramdisk_size = exec_ctx.ramdisk_size;
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copy_to_user ( exec_ctx.rm_kernel, BZI_HDR_OFFSET, &bzhdr,
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sizeof ( bzhdr ) );
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/* Prepare for exiting */
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shutdown ( SHUTDOWN_BOOT );
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DBGC ( image, "bzImage %p jumping to RM kernel at %04x:0000 "
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"(stack %04x:%04zx)\n", image,
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( exec_ctx.rm_kernel_seg + 0x20 ),
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exec_ctx.rm_kernel_seg, exec_ctx.rm_heap );
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/* Jump to the kernel */
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__asm__ __volatile__ ( REAL_CODE ( "movw %w0, %%ds\n\t"
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"movw %w0, %%es\n\t"
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"movw %w0, %%fs\n\t"
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"movw %w0, %%gs\n\t"
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"movw %w0, %%ss\n\t"
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"movw %w1, %%sp\n\t"
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"pushw %w2\n\t"
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"pushw $0\n\t"
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"lret\n\t" )
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: : "r" ( exec_ctx.rm_kernel_seg ),
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"r" ( exec_ctx.rm_heap ),
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"r" ( exec_ctx.rm_kernel_seg + 0x20 ) );
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/* There is no way for the image to return, since we provide
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* no return address.
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*/
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assert ( 0 );
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return -ECANCELED; /* -EIMPOSSIBLE */
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}
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/**
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* Load and parse bzImage header
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*
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* @v image bzImage file
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* @v load_ctx Load context
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* @v bzhdr Buffer for bzImage header
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* @ret rc Return status code
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*/
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static int bzimage_load_header ( struct image *image,
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struct bzimage_load_context *load_ctx,
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struct bzimage_header *bzhdr ) {
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/* Sanity check */
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if ( image->len < ( BZI_HDR_OFFSET + sizeof ( *bzhdr ) ) ) {
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DBGC ( image, "bzImage %p too short for kernel header\n",
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image );
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return -ENOEXEC;
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}
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/* Read and verify header */
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copy_from_user ( bzhdr, image->data, BZI_HDR_OFFSET,
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sizeof ( *bzhdr ) );
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if ( bzhdr->header != BZI_SIGNATURE ) {
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DBGC ( image, "bzImage %p bad signature %08lx\n",
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image, bzhdr->header );
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return -ENOEXEC;
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}
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/* We don't support ancient kernels */
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if ( bzhdr->version < 0x0200 ) {
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DBGC ( image, "bzImage %p version %04x not supported\n",
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image, bzhdr->version );
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return -ENOTSUP;
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}
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/* Calculate load address and size of real-mode portion */
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load_ctx->rm_kernel_seg = ( ( bzhdr->loadflags & BZI_LOAD_HIGH ) ?
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0x1000 : /* 1000:0000 (bzImage) */
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0x9000 ); /* 9000:0000 (zImage) */
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load_ctx->rm_kernel = real_to_user ( load_ctx->rm_kernel_seg, 0 );
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load_ctx->rm_filesz =
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( ( bzhdr->setup_sects ? bzhdr->setup_sects : 4 ) + 1 ) << 9;
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load_ctx->rm_memsz = BZI_ASSUMED_RM_SIZE;
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if ( load_ctx->rm_filesz > image->len ) {
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DBGC ( image, "bzImage %p too short for %zd byte of setup\n",
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image, load_ctx->rm_filesz );
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return -ENOEXEC;
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}
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/* Calculate load address and size of non-real-mode portion */
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load_ctx->pm_kernel = ( ( bzhdr->loadflags & BZI_LOAD_HIGH ) ?
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phys_to_user ( BZI_LOAD_HIGH_ADDR ) :
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phys_to_user ( BZI_LOAD_LOW_ADDR ) );
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load_ctx->pm_sz = ( image->len - load_ctx->rm_filesz );
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DBGC ( image, "bzImage %p version %04x RM %#zx bytes PM %#zx bytes\n",
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image, bzhdr->version, load_ctx->rm_filesz, load_ctx->pm_sz );
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return 0;
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}
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/**
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* Load real-mode portion of bzImage
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*
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* @v image bzImage file
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* @v load_ctx Load context
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* @ret rc Return status code
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*/
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static int bzimage_load_real ( struct image *image,
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struct bzimage_load_context *load_ctx ) {
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int rc;
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/* Allow space for the stack and heap */
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load_ctx->rm_memsz += BZI_STACK_SIZE;
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load_ctx->rm_heap = load_ctx->rm_memsz;
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/* Allow space for the command line */
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load_ctx->rm_cmdline = load_ctx->rm_memsz;
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load_ctx->rm_memsz += BZI_CMDLINE_SIZE;
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/* Prepare, verify, and load the real-mode segment */
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if ( ( rc = prep_segment ( load_ctx->rm_kernel, load_ctx->rm_filesz,
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load_ctx->rm_memsz ) ) != 0 ) {
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DBGC ( image, "bzImage %p could not prepare RM segment: %s\n",
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image, strerror ( rc ) );
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return rc;
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}
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memcpy_user ( load_ctx->rm_kernel, 0, image->data, 0,
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load_ctx->rm_filesz );
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return 0;
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}
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/**
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* Load non-real-mode portion of bzImage
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*
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* @v image bzImage file
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* @v load_ctx Load context
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* @ret rc Return status code
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*/
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static int bzimage_load_non_real ( struct image *image,
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struct bzimage_load_context *load_ctx ) {
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int rc;
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/* Prepare, verify and load the non-real-mode segment */
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if ( ( rc = prep_segment ( load_ctx->pm_kernel, load_ctx->pm_sz,
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load_ctx->pm_sz ) ) != 0 ) {
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DBGC ( image, "bzImage %p could not prepare PM segment: %s\n",
|
|
image, strerror ( rc ) );
|
|
return rc;
|
|
}
|
|
memcpy_user ( load_ctx->pm_kernel, 0, image->data, load_ctx->rm_filesz,
|
|
load_ctx->pm_sz );
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Update and store bzImage header
|
|
*
|
|
* @v image bzImage file
|
|
* @v load_ctx Load context
|
|
* @v bzhdr Original bzImage header
|
|
* @ret rc Return status code
|
|
*/
|
|
static int bzimage_write_header ( struct image *image __unused,
|
|
struct bzimage_load_context *load_ctx,
|
|
struct bzimage_header *bzhdr ) {
|
|
struct bzimage_cmdline cmdline;
|
|
|
|
/* Update the header and copy it into the loaded kernel */
|
|
bzhdr->type_of_loader = BZI_LOADER_TYPE_GPXE;
|
|
if ( bzhdr->version >= 0x0201 ) {
|
|
bzhdr->heap_end_ptr = ( load_ctx->rm_heap - 0x200 );
|
|
bzhdr->loadflags |= BZI_CAN_USE_HEAP;
|
|
}
|
|
if ( bzhdr->version >= 0x0202 ) {
|
|
bzhdr->cmd_line_ptr = user_to_phys ( load_ctx->rm_kernel,
|
|
load_ctx->rm_cmdline );
|
|
} else {
|
|
cmdline.magic = BZI_CMDLINE_MAGIC;
|
|
cmdline.offset = load_ctx->rm_cmdline;
|
|
copy_to_user ( load_ctx->rm_kernel, BZI_CMDLINE_OFFSET,
|
|
&cmdline, sizeof ( cmdline ) );
|
|
bzhdr->setup_move_size = load_ctx->rm_memsz;
|
|
}
|
|
copy_to_user ( load_ctx->rm_kernel, BZI_HDR_OFFSET,
|
|
bzhdr, sizeof ( *bzhdr ) );
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Load bzImage image into memory
|
|
*
|
|
* @v image bzImage file
|
|
* @ret rc Return status code
|
|
*/
|
|
int bzimage_load ( struct image *image ) {
|
|
struct bzimage_load_context load_ctx;
|
|
struct bzimage_header bzhdr;
|
|
int rc;
|
|
|
|
/* Initialise context */
|
|
memset ( &load_ctx, 0, sizeof ( load_ctx ) );
|
|
|
|
/* Load and verify header */
|
|
if ( ( rc = bzimage_load_header ( image, &load_ctx, &bzhdr ) ) != 0 )
|
|
return rc;
|
|
|
|
/* This is a bzImage image, valid or otherwise */
|
|
if ( ! image->type )
|
|
image->type = &bzimage_image_type;
|
|
|
|
/* Load real-mode portion */
|
|
if ( ( rc = bzimage_load_real ( image, &load_ctx ) ) != 0 )
|
|
return rc;
|
|
|
|
/* Load non-real-mode portion */
|
|
if ( ( rc = bzimage_load_non_real ( image, &load_ctx ) ) != 0 )
|
|
return rc;
|
|
|
|
/* Update and write out header */
|
|
if ( ( rc = bzimage_write_header ( image, &load_ctx, &bzhdr ) ) != 0 )
|
|
return rc;
|
|
|
|
/* Record real-mode segment in image private data field */
|
|
image->priv.ul = load_ctx.rm_kernel_seg;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/** Linux bzImage image type */
|
|
struct image_type bzimage_image_type __image_type ( PROBE_NORMAL ) = {
|
|
.name = "bzImage",
|
|
.load = bzimage_load,
|
|
.exec = bzimage_exec,
|
|
};
|