3cfa4bc00c
We have our file helper functions in several places. Move them all to lib/libfile.c. With this we no longer have file helpers in fs/fs.c which contains the core fs functions and no functions in lib/libbb.c which are not from busybox. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
341 lines
10 KiB
C
341 lines
10 KiB
C
/*
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* Copyright (C) 2009 Juergen Beisert, Pengutronix
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*
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* In parts from the GRUB2 project:
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*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2007,2008 Free Software Foundation, Inc.
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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
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*
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*/
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#include <common.h>
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#include <command.h>
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#include <environment.h>
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#include <fs.h>
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#include <errno.h>
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#include <libfile.h>
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#include <getopt.h>
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#include <malloc.h>
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#include <boot.h>
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#include <asm/syslib.h>
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/** FIXME */
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#define LINUX_MAGIC_SIGNATURE 0x53726448 /* "HdrS" */
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/** FIXME */
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#define LINUX_FLAG_BIG_KERNEL 0x1
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/** FIXME */
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#define LINUX_BOOT_LOADER_TYPE 0x72
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/** FIXME */
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#define LINUX_DEFAULT_SETUP_SECTS 4
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/** FIXME */
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#define LINUX_MAX_SETUP_SECTS 64
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/** FIXME */
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#define LINUX_OLD_REAL_MODE_SEGMT 0x9000
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/** FIXME */
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#define LINUX_OLD_REAL_MODE_ADDR (LINUX_OLD_REAL_MODE_SEGMT << 4)
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/** FIXME */
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#define LINUX_HEAP_END_OFFSET (LINUX_OLD_REAL_MODE_SEGMT - 0x200)
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/** FIXME */
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#define LINUX_FLAG_CAN_USE_HEAP 0x80
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/** Define kernel command lines's start offset in the setup segment */
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#define LINUX_CL_OFFSET 0x9000
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/** Define kernel command lines's end offset */
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#define LINUX_CL_END_OFFSET 0x90FF
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/** FIXME */
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#define LINUX_CL_MAGIC 0xA33F
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/** FIXME */
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#define LINUX_SETUP_MOVE_SIZE 0x9100
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/** Sector size */
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#define DISK_SECTOR_BITS 9
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#define DISK_SECTOR_SIZE 0x200
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/** Where to load a bzImage */
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#define LINUX_BZIMAGE_ADDR 0x100000
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struct linux_kernel_header {
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/* first sector of the image */
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uint8_t code1[0x0020];
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uint16_t cl_magic; /**< Magic number 0xA33F */
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uint16_t cl_offset; /**< The offset of command line */
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uint8_t code2[0x01F1 - 0x0020 - 2 - 2];
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uint8_t setup_sects; /**< The size of the setup in sectors */
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uint16_t root_flags; /**< If the root is mounted readonly */
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uint16_t syssize; /**< obsolete */
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uint16_t swap_dev; /**< obsolete */
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uint16_t ram_size; /**< obsolete */
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uint16_t vid_mode; /**< Video mode control */
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uint16_t root_dev; /**< Default root device number */
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uint16_t boot_flag; /**< 0xAA55 magic number */
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/* second sector of the image */
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uint16_t jump; /**< Jump instruction (this is code!) */
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uint32_t header; /**< Magic signature "HdrS" */
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uint16_t version; /**< Boot protocol version supported */
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uint32_t realmode_swtch; /**< Boot loader hook */
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uint16_t start_sys; /**< The load-low segment (obsolete) */
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uint16_t kernel_version; /**< Points to kernel version string */
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uint8_t type_of_loader; /**< Boot loader identifier */
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#define LINUX_LOADER_ID_LILO 0x0
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#define LINUX_LOADER_ID_LOADLIN 0x1
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#define LINUX_LOADER_ID_BOOTSECT 0x2
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#define LINUX_LOADER_ID_SYSLINUX 0x3
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#define LINUX_LOADER_ID_ETHERBOOT 0x4
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#define LINUX_LOADER_ID_ELILO 0x5
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#define LINUX_LOADER_ID_GRUB 0x7
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#define LINUX_LOADER_ID_UBOOT 0x8
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#define LINUX_LOADER_ID_XEN 0x9
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#define LINUX_LOADER_ID_GUJIN 0xa
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#define LINUX_LOADER_ID_QEMU 0xb
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uint8_t loadflags; /**< Boot protocol option flags */
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uint16_t setup_move_size; /**< Move to high memory size */
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uint32_t code32_start; /**< Boot loader hook */
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uint32_t ramdisk_image; /**< initrd load address */
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uint32_t ramdisk_size; /**< initrd size */
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uint32_t bootsect_kludge; /**< obsolete */
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uint16_t heap_end_ptr; /**< Free memory after setup end */
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uint8_t ext_loader_ver; /**< boot loader's extension of the version number */
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uint8_t ext_loader_type; /**< boot loader's extension of its type */
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char *cmd_line_ptr; /**< Points to the kernel command line */
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uint32_t initrd_addr_max; /**< Highest address for initrd */
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#if 0
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/* for the records only. These members are defined in
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* more recent Linux kernels
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*/
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uint32_t kernel_alignment; /**< Alignment unit required by the kernel */
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uint8_t relocatable_kernel; /** */
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uint8_t min_alignment; /** */
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uint32_t cmdline_size; /** */
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uint32_t hardware_subarch; /** */
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uint64_t hardware_subarch_data; /** */
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uint32_t payload_offset; /** */
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uint32_t payload_length; /** */
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uint64_t setup_data; /** */
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uint64_t pref_address; /** */
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uint32_t init_size; /** */
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#endif
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} __attribute__ ((packed));
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/* This is -1. Keep this value in sync with the kernel */
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#define NORMAL_VGA 0xffff /* 80x25 mode */
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#define ASK_VGA 0xfffd /* ask for it at bootup */
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/**
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* Load an x86 Linux kernel bzImage and start it
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* @param argc parameter count
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* @param argv list of parameter
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*
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* Loads an x86 bzImage, checks for its integrity, stores the two parts
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* (setup = 'real mode code' and kernel = 'protected mode code') to their
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* default locations, switches back to real mode and runs the setup code.
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*/
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static int do_linux16(int argc, char *argv[])
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{
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struct linux_kernel_header *lh = NULL;
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int rc, opt;
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unsigned setup_sects;
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unsigned real_mode_size;
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int vid_mode = NORMAL_VGA;
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size_t image_size;
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const char *cmdline = linux_bootargs_get();
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const char *kernel_file;
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while((opt = getopt(argc, argv, "v:")) > 0) {
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switch(opt) {
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case 'v':
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vid_mode = simple_strtoul(optarg, NULL, 0);
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if (vid_mode == 0) {
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if (!strcmp(optarg, "ask"))
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vid_mode = ASK_VGA;
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else {
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printf("Unknown video mode: %s\n", optarg);
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return 1;
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}
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}
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break;
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}
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}
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if (optind == argc) {
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printf("No kernel filename given\n");
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return 1;
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}
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kernel_file = argv[optind];
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lh = read_file(kernel_file, &image_size);
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if (lh == NULL) {
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printf("Cannot read file '%s'\n", argv[1]);
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return 1;
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}
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if (lh->boot_flag != 0xaa55) {
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printf("File '%s' has invalid magic number\n", argv[1]);
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rc = 1;
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goto on_error;
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}
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if (lh->setup_sects > LINUX_MAX_SETUP_SECTS) {
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printf("File '%s' contains too many setup sectors\n", argv[1]);
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rc = 1;
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goto on_error;
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}
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setup_sects = lh->setup_sects;
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printf("Found a %d.%d image header\n", lh->version >> 8, lh->version & 0xFF);
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if (lh->header == LINUX_MAGIC_SIGNATURE && lh->version >= 0x0200) {
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/* kernel is recent enough */
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;
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if (!(lh->loadflags & LINUX_FLAG_BIG_KERNEL)) {
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printf("Cannot load a classic zImage. Use a bzImage instead\n");
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goto on_error;
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}
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lh->type_of_loader = LINUX_BOOT_LOADER_TYPE; /* TODO */
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if (lh->version >= 0x0201) {
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lh->heap_end_ptr = LINUX_HEAP_END_OFFSET;
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lh->loadflags |= LINUX_FLAG_CAN_USE_HEAP;
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}
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if (lh->version >= 0x0202)
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lh->cmd_line_ptr = (void*)(LINUX_OLD_REAL_MODE_ADDR + LINUX_CL_OFFSET); /* FIXME */
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else {
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lh->cl_magic = LINUX_CL_MAGIC;
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lh->cl_offset = LINUX_CL_OFFSET;
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lh->setup_move_size = LINUX_SETUP_MOVE_SIZE;
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}
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} else {
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printf("Kernel too old to handle\n");
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rc = 1;
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goto on_error;
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}
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if (strlen(cmdline) >= (LINUX_CL_END_OFFSET - LINUX_CL_OFFSET)) {
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printf("Kernel command line exceeds the available space\n");
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rc = 1;
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goto on_error;
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}
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/*
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* The kernel does not check for the "vga=<val>" kernel command line
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* parameter anymore. It expects this kind of information in the
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* boot parameters instead.
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*/
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if (vid_mode != NORMAL_VGA)
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lh->vid_mode = vid_mode;
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/* If SETUP_SECTS is not set, set it to the default. */
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if (setup_sects == 0) {
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printf("Fixing setup sector count\n");
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setup_sects = LINUX_DEFAULT_SETUP_SECTS;
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}
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if (setup_sects >= 15) {
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void *src = lh;
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if (lh->kernel_version != 0)
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printf("Kernel version: '%s'\n",
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(char *)src + lh->kernel_version + DISK_SECTOR_SIZE);
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}
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/*
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* Size of the real mode part to handle in a separate way
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*/
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real_mode_size = (setup_sects << DISK_SECTOR_BITS) + DISK_SECTOR_SIZE;
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/*
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* real mode space hole extended memory
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* |---------------------------------------------->|----------->|------------------------------>
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* 0 0xa0000 0x100000
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* <-1-|----------2-----------><-3- |
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* 0x7e00 0x90000
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* <-4--|-5--> |---------6------------->
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*
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* 1) real mode stack
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* 2) barebox code
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* 3) flat mode stack
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* 4) realmode stack when starting a Linux kernel
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* 5) Kernel's real mode setup code
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* 6) compressed kernel image
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*/
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/*
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* Parts of the image we know:
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* - real mode part
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* - kernel payload
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*/
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/*
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* NOTE: This part is dangerous, as it copies some image content to
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* various locations in the main memory. This could overwrite important
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* data of the running barebox (hopefully not)
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*/
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/* copy the real mode part of the image to the 9th segment */
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memcpy((void*)LINUX_OLD_REAL_MODE_ADDR, lh, LINUX_SETUP_MOVE_SIZE);
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/* TODO add 'BOOT_IMAGE=<file>' and 'auto' if no user intervention was done (in front of all other params) */
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/* copy also the command line into this area */
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memcpy((void*)(LINUX_OLD_REAL_MODE_ADDR + LINUX_CL_OFFSET), cmdline, strlen(cmdline) + 1);
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printf("Using kernel command line: '%s'\n", cmdline);
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/* copy the compressed image part to its final address the setup code expects it
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* Note: The protected mode part starts at offset (setup_sects + 1) * 512
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*/
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memcpy((void*)LINUX_BZIMAGE_ADDR, ((void*)lh) + real_mode_size, image_size - real_mode_size);
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/*
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* switch back to real mode now and start the real mode part of the
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* image at address "(LINUX_OLD_REAL_MODE_ADDR >> 4) + 0x20:0x0000"
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* which means "0x9020:0x000" -> 0x90200
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*/
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bios_start_linux(LINUX_OLD_REAL_MODE_SEGMT); /* does not return */
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on_error:
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if (lh != NULL)
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free(lh);
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return rc;
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}
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BAREBOX_CMD_HELP_START(linux16)
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BAREBOX_CMD_HELP_TEXT("Load kernel from FILE and boot on x86 in real-mode.")
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BAREBOX_CMD_HELP_TEXT("")
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BAREBOX_CMD_HELP_TEXT("Only kernel images in bzImage format are supported by now.")
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BAREBOX_CMD_HELP_TEXT("")
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BAREBOX_CMD_HELP_TEXT("For the video mode refer the Linux kernel documentation")
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BAREBOX_CMD_HELP_TEXT("'Documentation/fb/vesafb.txt' for correct VESA mode numbers. Use 'ask'")
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BAREBOX_CMD_HELP_TEXT("instead of a number to make Linux for options..")
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BAREBOX_CMD_HELP_TEXT("")
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BAREBOX_CMD_HELP_TEXT("Options:")
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BAREBOX_CMD_HELP_OPT ("-v VESAMODE", "set VESAMODE")
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BAREBOX_CMD_HELP_END
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BAREBOX_CMD_START(linux16)
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.cmd = do_linux16,
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BAREBOX_CMD_DESC("boot a linux kernel on x86 via real-mode code")
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BAREBOX_CMD_OPTS("[-v VESAMODE] FILE")
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BAREBOX_CMD_GROUP(CMD_GRP_BOOT)
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BAREBOX_CMD_HELP(cmd_linux16_help)
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BAREBOX_CMD_END
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