291f36325f
There is currently a large divide between kernel development and the
development of EFI boot loaders. The idea behind this patch is to give
the kernel developers full control over the EFI boot process. As
H. Peter Anvin put it,
"The 'kernel carries its own stub' approach been very successful in
dealing with BIOS, and would make a lot of sense to me for EFI as
well."
This patch introduces an EFI boot stub that allows an x86 bzImage to
be loaded and executed by EFI firmware. The bzImage appears to the
firmware as an EFI application. Luckily there are enough free bits
within the bzImage header so that it can masquerade as an EFI
application, thereby coercing the EFI firmware into loading it and
jumping to its entry point. The beauty of this masquerading approach
is that both BIOS and EFI boot loaders can still load and run the same
bzImage, thereby allowing a single kernel image to work in any boot
environment.
The EFI boot stub supports multiple initrds, but they must exist on
the same partition as the bzImage. Command-line arguments for the
kernel can be appended after the bzImage name when run from the EFI
shell, e.g.
Shell> bzImage console=ttyS0 root=/dev/sdb initrd=initrd.img
v7:
- Fix checkpatch warnings.
v6:
- Try to allocate initrd memory just below hdr->inird_addr_max.
v5:
- load_options_size is UTF-16, which needs dividing by 2 to convert
to the corresponding ASCII size.
v4:
- Don't read more than image->load_options_size
v3:
- Fix following warnings when compiling CONFIG_EFI_STUB=n
arch/x86/boot/tools/build.c: In function ‘main’:
arch/x86/boot/tools/build.c:138:24: warning: unused variable ‘pe_header’
arch/x86/boot/tools/build.c:138:15: warning: unused variable ‘file_sz’
- As reported by Matthew Garrett, some Apple machines have GOPs that
don't have hardware attached. We need to weed these out by
searching for ones that handle the PCIIO protocol.
- Don't allocate memory if no initrds are on cmdline
- Don't trust image->load_options_size
Maarten Lankhorst noted:
- Don't strip first argument when booted from efibootmgr
- Don't allocate too much memory for cmdline
- Don't update cmdline_size, the kernel considers it read-only
- Don't accept '\n' for initrd names
v2:
- File alignment was too large, was 8192 should be 512. Reported by
Maarten Lankhorst on LKML.
- Added UGA support for graphics
- Use VIDEO_TYPE_EFI instead of hard-coded number.
- Move linelength assignment until after we've assigned depth
- Dynamically fill out AddressOfEntryPoint in tools/build.c
- Don't use magic number for GDT/TSS stuff. Requested by Andi Kleen
- The bzImage may need to be relocated as it may have been loaded at
a high address address by the firmware. This was required to get my
macbook booting because the firmware loaded it at 0x7cxxxxxx, which
triggers this error in decompress_kernel(),
if (heap > ((-__PAGE_OFFSET-(128<<20)-1) & 0x7fffffff))
error("Destination address too large");
Cc: Mike Waychison <mikew@google.com>
Cc: Matthew Garrett <mjg@redhat.com>
Tested-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Link: http://lkml.kernel.org/r/1321383097.2657.9.camel@mfleming-mobl1.ger.corp.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
262 lines
8.1 KiB
C
262 lines
8.1 KiB
C
/*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright (C) 1997 Martin Mares
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* Copyright (C) 2007 H. Peter Anvin
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*/
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/*
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* This file builds a disk-image from two different files:
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*
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* - setup: 8086 machine code, sets up system parm
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* - system: 80386 code for actual system
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*
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* It does some checking that all files are of the correct type, and
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* just writes the result to stdout, removing headers and padding to
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* the right amount. It also writes some system data to stderr.
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*/
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/*
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* Changes by tytso to allow root device specification
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* High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
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* Cross compiling fixes by Gertjan van Wingerde, July 1996
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* Rewritten by Martin Mares, April 1997
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* Substantially overhauled by H. Peter Anvin, April 2007
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/sysmacros.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <asm/boot.h>
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned long u32;
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#define DEFAULT_MAJOR_ROOT 0
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#define DEFAULT_MINOR_ROOT 0
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/* Minimal number of setup sectors */
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#define SETUP_SECT_MIN 5
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#define SETUP_SECT_MAX 64
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/* This must be large enough to hold the entire setup */
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u8 buf[SETUP_SECT_MAX*512];
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int is_big_kernel;
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/*----------------------------------------------------------------------*/
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static const u32 crctab32[] = {
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
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0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
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0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
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0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
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0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
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0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
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0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
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0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
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0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
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0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
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0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
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0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
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0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
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0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
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0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
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0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
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0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
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0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
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0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
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0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
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0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
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0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
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0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
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0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
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0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
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0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
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0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
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0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
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0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
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0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
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0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
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0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
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0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
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0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
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0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
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0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
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0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
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0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
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0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
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0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
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0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
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0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
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0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
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0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
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0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
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0x2d02ef8d
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};
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static u32 partial_crc32_one(u8 c, u32 crc)
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{
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return crctab32[(crc ^ c) & 0xff] ^ (crc >> 8);
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}
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static u32 partial_crc32(const u8 *s, int len, u32 crc)
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{
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while (len--)
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crc = partial_crc32_one(*s++, crc);
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return crc;
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}
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static void die(const char * str, ...)
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{
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va_list args;
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va_start(args, str);
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vfprintf(stderr, str, args);
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fputc('\n', stderr);
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exit(1);
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}
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static void usage(void)
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{
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die("Usage: build setup system [> image]");
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}
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int main(int argc, char ** argv)
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{
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#ifdef CONFIG_EFI_STUB
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unsigned int file_sz, pe_header;
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#endif
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unsigned int i, sz, setup_sectors;
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int c;
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u32 sys_size;
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struct stat sb;
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FILE *file;
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int fd;
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void *kernel;
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u32 crc = 0xffffffffUL;
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if (argc != 3)
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usage();
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/* Copy the setup code */
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file = fopen(argv[1], "r");
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if (!file)
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die("Unable to open `%s': %m", argv[1]);
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c = fread(buf, 1, sizeof(buf), file);
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if (ferror(file))
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die("read-error on `setup'");
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if (c < 1024)
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die("The setup must be at least 1024 bytes");
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if (buf[510] != 0x55 || buf[511] != 0xaa)
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die("Boot block hasn't got boot flag (0xAA55)");
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fclose(file);
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/* Pad unused space with zeros */
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setup_sectors = (c + 511) / 512;
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if (setup_sectors < SETUP_SECT_MIN)
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setup_sectors = SETUP_SECT_MIN;
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i = setup_sectors*512;
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memset(buf+c, 0, i-c);
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/* Set the default root device */
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buf[508] = DEFAULT_MINOR_ROOT;
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buf[509] = DEFAULT_MAJOR_ROOT;
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fprintf(stderr, "Setup is %d bytes (padded to %d bytes).\n", c, i);
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/* Open and stat the kernel file */
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fd = open(argv[2], O_RDONLY);
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if (fd < 0)
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die("Unable to open `%s': %m", argv[2]);
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if (fstat(fd, &sb))
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die("Unable to stat `%s': %m", argv[2]);
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sz = sb.st_size;
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fprintf (stderr, "System is %d kB\n", (sz+1023)/1024);
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kernel = mmap(NULL, sz, PROT_READ, MAP_SHARED, fd, 0);
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if (kernel == MAP_FAILED)
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die("Unable to mmap '%s': %m", argv[2]);
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/* Number of 16-byte paragraphs, including space for a 4-byte CRC */
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sys_size = (sz + 15 + 4) / 16;
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/* Patch the setup code with the appropriate size parameters */
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buf[0x1f1] = setup_sectors-1;
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buf[0x1f4] = sys_size;
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buf[0x1f5] = sys_size >> 8;
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buf[0x1f6] = sys_size >> 16;
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buf[0x1f7] = sys_size >> 24;
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#ifdef CONFIG_EFI_STUB
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file_sz = sz + i + ((sys_size * 16) - sz);
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pe_header = *(unsigned int *)&buf[0x3c];
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/* Size of code */
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*(unsigned int *)&buf[pe_header + 0x1c] = file_sz;
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/* Size of image */
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*(unsigned int *)&buf[pe_header + 0x50] = file_sz;
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#ifdef CONFIG_X86_32
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/* Address of entry point */
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*(unsigned int *)&buf[pe_header + 0x28] = i;
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/* .text size */
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*(unsigned int *)&buf[pe_header + 0xb0] = file_sz;
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/* .text size of initialised data */
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*(unsigned int *)&buf[pe_header + 0xb8] = file_sz;
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#else
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/*
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* Address of entry point. startup_32 is at the beginning and
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* the 64-bit entry point (startup_64) is always 512 bytes
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* after.
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*/
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*(unsigned int *)&buf[pe_header + 0x28] = i + 512;
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/* .text size */
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*(unsigned int *)&buf[pe_header + 0xc0] = file_sz;
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/* .text size of initialised data */
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*(unsigned int *)&buf[pe_header + 0xc8] = file_sz;
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#endif /* CONFIG_X86_32 */
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#endif /* CONFIG_EFI_STUB */
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crc = partial_crc32(buf, i, crc);
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if (fwrite(buf, 1, i, stdout) != i)
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die("Writing setup failed");
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/* Copy the kernel code */
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crc = partial_crc32(kernel, sz, crc);
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if (fwrite(kernel, 1, sz, stdout) != sz)
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die("Writing kernel failed");
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/* Add padding leaving 4 bytes for the checksum */
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while (sz++ < (sys_size*16) - 4) {
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crc = partial_crc32_one('\0', crc);
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if (fwrite("\0", 1, 1, stdout) != 1)
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die("Writing padding failed");
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}
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/* Write the CRC */
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fprintf(stderr, "CRC %lx\n", crc);
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if (fwrite(&crc, 1, 4, stdout) != 4)
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die("Writing CRC failed");
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close(fd);
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/* Everything is OK */
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return 0;
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}
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