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/* ----------------------------------------------------------------------- *
*
* Copyright 2008 rPath, Inc. - All Rights Reserved
* Copyright 2010 Intel Corporation; author: H. Peter Anvin
*
* 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, Inc., 51 Franklin St, Fifth Floor,
* Boston MA 02110-1301, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
/*
* wrap.c
*
* Actually wrap the kernel image...
*/
#include <ctype.h>
#include <stdio.h>
#include <unistd.h>
#include <getopt.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sysexits.h>
#include <sys/types.h>
#include "segment.h"
#include "setup.h"
#include "elf32.h"
#include "le.h"
#include "wraplinux.h"
extern char reloc[];
extern uint32_t reloc_size;
extern char highmove[];
extern uint32_t highmove_size;
/* Find the last instance of a particular command line argument
(which should include the final =; do not use for boolean arguments) */
static const char *find_argument(const char *cmdline, const char *argument)
{
int la = strlen(argument);
const char *p = cmdline;
int wasspace = 1;
while (*p) {
if (wasspace && !memcmp(p, argument, la))
return p + la;
wasspace = isspace(*p++);
}
return NULL;
}
/* Truncate to 32 bits, with saturate */
static inline uint32_t saturate32(unsigned long long v)
{
return (v > 0xffffffff) ? 0xffffffff : (uint32_t) v;
}
/* Get a value with a potential suffix (k/m/g/t/p/e) */
static unsigned long long suffix_number(const char *str)
{
char *ep;
unsigned long long v;
int shift;
v = strtoull(str, &ep, 0);
switch (*ep | 0x20) {
case 'k':
shift = 10;
break;
case 'm':
shift = 20;
break;
case 'g':
shift = 30;
break;
case 't':
shift = 40;
break;
case 'p':
shift = 50;
break;
case 'e':
shift = 60;
break;
default:
shift = 0;
break;
}
v <<= shift;
return v;
}
int wrap_kernel(const char *kernel_file, const char *cmdline,
const struct string_list *initrd_list, FILE *out)
{
struct initrd_info {
int fd;
struct segment seg;
} *ird = NULL;
int kernel_fd = -1;
char *kernel = NULL;
size_t kernel_len = 0;
struct segment srel, ssup, scmd, skrn, shmv;
struct startup_info *info = (void *)reloc;
struct setup_header *hdr;
struct highmove_info *hmv = (void *)highmove;
size_t setup_len;
size_t initrd_len;
size_t initrd_addr;
int rv = EX_SOFTWARE; /* Should never be returned... */
int ninitrd = 0;
int i;
const struct string_list *ip;
int setup_ver; /* Setup protocol version */
int setup_space; /* How much space for the setup */
const char *cmd;
uint32_t initrd_max;
uint32_t entry;
/* Process the kernel file */
kernel_fd = open(kernel_file, O_RDONLY);
if (kernel_fd < 0) {
fprintf(stderr, "%s: %s: %s\n", program, kernel_file,
strerror(errno));
rv = EX_NOINPUT;
goto err;
}
kernel = mapfile(kernel_fd, &kernel_len, 1);
if (!kernel) {
fprintf(stderr, "%s: %s: %s\n", program, kernel_file,
strerror(errno));
rv = EX_NOINPUT;
goto err;
}
if (kernel_len < 1024) {
fprintf(stderr, "%s: %s: kernel file too small\n", program,
kernel_file);
rv = EX_NOINPUT;
errno = EINVAL;
goto err;
}
/* Pick apart the header... */
hdr = (struct setup_header *)(kernel + 0x1f1);
setup_len = (hdr->setup_sects + 1) << 9;
if (setup_len == 512)
setup_len += 2048; /* Really old kernel */
if (rdle32(&hdr->header) != LINUX_MAGIC)
setup_ver = 0; /* Ancient kernel */
else
setup_ver = rdle16(&hdr->version);
if (setup_ver >= 0x200 && (hdr->loadflags & LOADED_HIGH)) {
skrn.address = 0x100000;
ssup.address = 0x10000;
setup_space = setup_ver >= 0x202 ? 0x10000 : 0xa000;
} else {
skrn.address = 0x10000;
ssup.address = 0x90000;
setup_space = 0xa000;
}
if (setup_ver <= 0x200)
initrd_list = NULL; /* No initrd for ancient kernel */
if (setup_ver >= 0x203)
initrd_max = rdle32(&hdr->initrd_addr_max);
else
initrd_max = 0x37ffffff;
if ((cmd = find_argument(cmdline, "mem="))) {
uint32_t mem = saturate32(suffix_number(cmd));
if (initrd_max >= mem)
initrd_max = mem - 1;
}
if ((cmd = find_argument(cmdline, "vga="))) {
uint16_t vga;
switch (cmd[0] | 0x20) {
case 'a': /* "ask" */
vga = 0xfffd;
break;
case 'e': /* "ext" */
vga = 0xfffe;
break;
case 'n': /* "normal" */
vga = 0xffff;
break;
default:
vga = strtoul(cmd, NULL, 0);
break;
}
wrle16(vga, &hdr->vid_mode);
}
/* Process the initrd file(s) */
ninitrd = 0;
for (ip = initrd_list; ip; ip = ip->next)
ninitrd++;
if (ninitrd) {
ird = xcalloc(ninitrd, sizeof *ird);
for (i = 0; i < ninitrd; i++)
ird[i].fd = -1;
}
initrd_len = 0;
for (ip = initrd_list, i = 0; ip; ip = ip->next, i++) {
/* Each sub-initrd is aligned to a 4-byte boundary */
initrd_len = align_up(initrd_len, 2);
ird[i].fd = open(ip->str, O_RDONLY);
if (ird[i].fd < 0) {
fprintf(stderr, "%s: %s: %s", program, ip->str,
strerror(errno));
rv = EX_NOINPUT;
goto err;
}
ird[i].seg.data = mapfile(ird[i].fd, &ird[i].seg.length, 0);
if (!ird[i].seg.data) {
fprintf(stderr, "%s: %s: %s", program, ip->str,
strerror(errno));
rv = EX_NOINPUT;
goto err;
}
initrd_len += ird[i].seg.length;
}
/* Segment: relocation code */
/* We put this immediately after the kernel setup, in the memory
which will be reclaimed for setup. */
srel.next = &ssup;
srel.address = (ssup.address + setup_len + 15) & ~15;
srel.align = 4; /* 2**4 = 16 bytes */
srel.length = reloc_size;
srel.sh_type = SHT_PROGBITS;
srel.sh_flags = SHF_ALLOC | SHF_WRITE | SHF_EXECINSTR;
srel.name = "reloc";
srel.data = reloc;
/* Segment: Linux kernel setup */
ssup.next = &scmd;
ssup.align = 4; /* 2**4 = 16 bytes */
ssup.length = setup_len;
ssup.sh_type = SHT_PROGBITS;
ssup.sh_flags = SHF_ALLOC | SHF_WRITE | SHF_EXECINSTR;
ssup.name = "setup";
ssup.data = kernel;
if (setup_ver >= 0x200)
hdr->type_of_loader = 0xff; /* "Other modern loader" */
/* Segment: kernel command line */
scmd.next = &skrn;
scmd.length = strlen(cmdline) + 1;
scmd.address = (ssup.address + setup_space - scmd.length) & ~15;
scmd.align = 4; /* 2**4 = 16 bytes */
if (srel.address + reloc_size > scmd.address) {
/* Uh-oh, we're short on space... push the command line
higher. */
scmd.address = (srel.address + reloc_size + 15) & ~15;
}
scmd.sh_type = SHT_PROGBITS;
scmd.sh_flags = SHF_ALLOC;
scmd.name = "cmdline";
scmd.data = cmdline;
if (setup_ver >= 0x202) {
wrle32(scmd.address, &hdr->cmd_line_ptr);
} else {
/* Old-style command line protocol */
wrle16(OLD_CMDLINE_MAGIC, (uint16_t *) (kernel + 0x20));
wrle16(scmd.address - ssup.address,
(uint16_t *) (kernel + 0x22));
}
if (setup_ver >= 0x201) {
wrle16(scmd.address - ssup.address - 0x200, &hdr->heap_end_ptr);
hdr->loadflags |= CAN_USE_HEAP;
}
/* Setup information */
wrle32(ssup.address, &info->setup_addr);
wrle32(scmd.address, &info->cmdline_addr);
entry = srel.address + sizeof *info;
/* Segment: Linux kernel proper */
skrn.next = ninitrd ? &ird[0].seg : NULL;
skrn.align = 4; /* 2**4 = 16 bytes */
skrn.length = kernel_len - setup_len;
skrn.sh_type = SHT_PROGBITS;
skrn.sh_flags = SHF_ALLOC;
skrn.name = "kernel";
skrn.data = kernel + setup_len;
if (skrn.address < 0x100000)
initrd_addr = 0x100000;
else
initrd_addr = skrn.address + skrn.length;
/* Loadhigh modifications */
if (opt.loadhigh) {
uint32_t rm_base, rm_len, delta;
if (skrn.address < 0x100000) {
/* zImage, need to move the kernel as well */
wrle32(skrn.address, &hmv->mv[1].dst);
wrle32(skrn.length, &hmv->mv[1].len);
skrn.address = 0x100000;
wrle32(skrn.address, &hmv->mv[1].src);
initrd_addr = skrn.address + skrn.length;
}
shmv.next = skrn.next;
skrn.next = &shmv;
shmv.address = align_up(initrd_addr, 4);
shmv.align = 4;
shmv.length = highmove_size;
shmv.sh_type = SHT_PROGBITS;
shmv.sh_flags = SHF_ALLOC | SHF_EXECINSTR;
shmv.name = "highmove";
shmv.data = highmove;
rm_base = ssup.address;
rm_len = scmd.address + scmd.length - rm_base;
wrle32(rm_base, &hmv->mv[0].dst);
wrle32(rm_len, &hmv->mv[0].len);
wrle32(entry, &hmv->mv_entry);
entry = shmv.address + sizeof *hmv;
initrd_addr = shmv.address + shmv.length;
initrd_addr = align_up(initrd_addr, 4);
wrle32(initrd_addr, &hmv->mv[0].src);
delta = initrd_addr - ssup.address;
ssup.address += delta;
srel.address += delta;
scmd.address += delta;
initrd_addr += rm_len;
}
/* Additional segments: initrd */
for (i = 0; i < ninitrd; i++) {
char *name;
initrd_addr = align_up(initrd_addr, 2);
ird[i].seg.next = (i < ninitrd - 1) ? &ird[i + 1].seg : 0;
ird[i].seg.address = initrd_addr;
ird[i].seg.align = 2; /* 2**2 = 4 bytes */
ird[i].seg.sh_type = SHT_PROGBITS;
ird[i].seg.sh_flags = SHF_ALLOC;
xasprintf(&name, "initrd.%d", i);
ird[i].seg.name = name;
initrd_addr += ird[i].seg.length;
}
if (setup_ver >= 0x200)
wrle32(initrd_len, &hdr->ramdisk_size);
/* Initrd information in the startup info */
wrle32(ninitrd ? ird[0].seg.address : 0, &info->rd_addr);
wrle32(initrd_len, &info->rd_len);
wrle32(initrd_max, &info->rd_maxaddr);
rv = opt.output(&srel, entry, out);
err:
if (ird) {
for (i = 0; i < ninitrd; i++)
unmapfile(ird[i].fd, (void *)ird[i].seg.data,
ird[i].seg.length);
free(ird);
}
unmapfile(kernel_fd, kernel, kernel_len);
return rv;
}
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