2005-04-16 16:20:36 -06:00
|
|
|
/*
|
|
|
|
* misc.c
|
2008-01-30 05:33:38 -07:00
|
|
|
*
|
|
|
|
* This is a collection of several routines from gzip-1.0.3
|
2005-04-16 16:20:36 -06:00
|
|
|
* adapted for Linux.
|
|
|
|
*
|
|
|
|
* malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
|
|
|
|
* puts by Nick Holloway 1993, better puts by Martin Mares 1995
|
|
|
|
* High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
|
|
|
|
*/
|
|
|
|
|
2008-01-30 05:33:38 -07:00
|
|
|
/*
|
|
|
|
* we have to be careful, because no indirections are allowed here, and
|
|
|
|
* paravirt_ops is a kind of one. As it will only run in baremetal anyway,
|
|
|
|
* we just keep it from happening
|
|
|
|
*/
|
2006-12-06 18:14:07 -07:00
|
|
|
#undef CONFIG_PARAVIRT
|
2008-02-13 13:54:58 -07:00
|
|
|
#ifdef CONFIG_X86_32
|
2008-10-22 23:26:29 -06:00
|
|
|
#define _ASM_X86_DESC_H 1
|
2008-02-13 13:54:58 -07:00
|
|
|
#endif
|
|
|
|
|
2008-01-30 05:33:38 -07:00
|
|
|
#ifdef CONFIG_X86_64
|
|
|
|
#define _LINUX_STRING_H_ 1
|
|
|
|
#define __LINUX_BITMAP_H 1
|
|
|
|
#endif
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
#include <linux/linkage.h>
|
2006-01-08 02:04:54 -07:00
|
|
|
#include <linux/screen_info.h>
|
2008-02-13 13:54:58 -07:00
|
|
|
#include <linux/elf.h>
|
2008-08-02 13:23:36 -06:00
|
|
|
#include <linux/io.h>
|
2006-12-06 18:14:04 -07:00
|
|
|
#include <asm/page.h>
|
2006-12-06 18:14:04 -07:00
|
|
|
#include <asm/boot.h>
|
2008-05-29 16:31:14 -06:00
|
|
|
#include <asm/bootparam.h>
|
2006-12-06 18:14:04 -07:00
|
|
|
|
|
|
|
/* WARNING!!
|
|
|
|
* This code is compiled with -fPIC and it is relocated dynamically
|
|
|
|
* at run time, but no relocation processing is performed.
|
|
|
|
* This means that it is not safe to place pointers in static structures.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Getting to provable safe in place decompression is hard.
|
2007-10-19 17:13:56 -06:00
|
|
|
* Worst case behaviours need to be analyzed.
|
2006-12-06 18:14:04 -07:00
|
|
|
* Background information:
|
|
|
|
*
|
|
|
|
* The file layout is:
|
|
|
|
* magic[2]
|
|
|
|
* method[1]
|
|
|
|
* flags[1]
|
|
|
|
* timestamp[4]
|
|
|
|
* extraflags[1]
|
|
|
|
* os[1]
|
|
|
|
* compressed data blocks[N]
|
|
|
|
* crc[4] orig_len[4]
|
|
|
|
*
|
|
|
|
* resulting in 18 bytes of non compressed data overhead.
|
|
|
|
*
|
|
|
|
* Files divided into blocks
|
|
|
|
* 1 bit (last block flag)
|
|
|
|
* 2 bits (block type)
|
|
|
|
*
|
2008-02-20 21:03:48 -07:00
|
|
|
* 1 block occurs every 32K -1 bytes or when there 50% compression
|
|
|
|
* has been achieved. The smallest block type encoding is always used.
|
2006-12-06 18:14:04 -07:00
|
|
|
*
|
|
|
|
* stored:
|
|
|
|
* 32 bits length in bytes.
|
|
|
|
*
|
|
|
|
* fixed:
|
|
|
|
* magic fixed tree.
|
|
|
|
* symbols.
|
|
|
|
*
|
|
|
|
* dynamic:
|
|
|
|
* dynamic tree encoding.
|
|
|
|
* symbols.
|
|
|
|
*
|
|
|
|
*
|
|
|
|
* The buffer for decompression in place is the length of the
|
|
|
|
* uncompressed data, plus a small amount extra to keep the algorithm safe.
|
|
|
|
* The compressed data is placed at the end of the buffer. The output
|
|
|
|
* pointer is placed at the start of the buffer and the input pointer
|
|
|
|
* is placed where the compressed data starts. Problems will occur
|
|
|
|
* when the output pointer overruns the input pointer.
|
|
|
|
*
|
|
|
|
* The output pointer can only overrun the input pointer if the input
|
|
|
|
* pointer is moving faster than the output pointer. A condition only
|
|
|
|
* triggered by data whose compressed form is larger than the uncompressed
|
|
|
|
* form.
|
|
|
|
*
|
|
|
|
* The worst case at the block level is a growth of the compressed data
|
|
|
|
* of 5 bytes per 32767 bytes.
|
|
|
|
*
|
|
|
|
* The worst case internal to a compressed block is very hard to figure.
|
|
|
|
* The worst case can at least be boundined by having one bit that represents
|
|
|
|
* 32764 bytes and then all of the rest of the bytes representing the very
|
|
|
|
* very last byte.
|
|
|
|
*
|
|
|
|
* All of which is enough to compute an amount of extra data that is required
|
|
|
|
* to be safe. To avoid problems at the block level allocating 5 extra bytes
|
2008-02-20 21:03:48 -07:00
|
|
|
* per 32767 bytes of data is sufficient. To avoind problems internal to a
|
|
|
|
* block adding an extra 32767 bytes (the worst case uncompressed block size)
|
|
|
|
* is sufficient, to ensure that in the worst case the decompressed data for
|
2006-12-06 18:14:04 -07:00
|
|
|
* block will stop the byte before the compressed data for a block begins.
|
|
|
|
* To avoid problems with the compressed data's meta information an extra 18
|
|
|
|
* bytes are needed. Leading to the formula:
|
|
|
|
*
|
|
|
|
* extra_bytes = (uncompressed_size >> 12) + 32768 + 18 + decompressor_size.
|
|
|
|
*
|
|
|
|
* Adding 8 bytes per 32K is a bit excessive but much easier to calculate.
|
|
|
|
* Adding 32768 instead of 32767 just makes for round numbers.
|
|
|
|
* Adding the decompressor_size is necessary as it musht live after all
|
|
|
|
* of the data as well. Last I measured the decompressor is about 14K.
|
2007-10-19 17:13:56 -06:00
|
|
|
* 10K of actual data and 4K of bss.
|
2006-12-06 18:14:04 -07:00
|
|
|
*
|
|
|
|
*/
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
/*
|
|
|
|
* gzip declarations
|
|
|
|
*/
|
2008-02-20 21:03:48 -07:00
|
|
|
#define STATIC static
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
#undef memset
|
|
|
|
#undef memcpy
|
2008-02-20 21:03:48 -07:00
|
|
|
#define memzero(s, n) memset((s), 0, (n))
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
|
|
|
|
static void error(char *m);
|
2008-02-20 16:19:10 -07:00
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
/*
|
|
|
|
* This is set up by the setup-routine at boot-time
|
|
|
|
*/
|
2008-05-29 16:31:14 -06:00
|
|
|
static struct boot_params *real_mode; /* Pointer to real-mode data */
|
2008-05-29 16:31:15 -06:00
|
|
|
static int quiet;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2006-06-26 05:57:53 -06:00
|
|
|
static void *memset(void *s, int c, unsigned n);
|
2009-01-04 14:46:17 -07:00
|
|
|
void *memcpy(void *dest, const void *src, unsigned n);
|
2006-06-26 05:57:53 -06:00
|
|
|
|
2008-06-18 12:04:35 -06:00
|
|
|
static void __putstr(int, const char *);
|
|
|
|
#define putstr(__x) __putstr(0, __x)
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-01-30 05:33:38 -07:00
|
|
|
#ifdef CONFIG_X86_64
|
|
|
|
#define memptr long
|
|
|
|
#else
|
|
|
|
#define memptr unsigned
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static memptr free_mem_ptr;
|
|
|
|
static memptr free_mem_end_ptr;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-04-06 06:47:00 -06:00
|
|
|
static char *vidmem;
|
2005-04-16 16:20:36 -06:00
|
|
|
static int vidport;
|
|
|
|
static int lines, cols;
|
|
|
|
|
2009-01-04 14:46:17 -07:00
|
|
|
#ifdef CONFIG_KERNEL_GZIP
|
|
|
|
#include "../../../../lib/decompress_inflate.c"
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef CONFIG_KERNEL_BZIP2
|
|
|
|
#include "../../../../lib/decompress_bunzip2.c"
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef CONFIG_KERNEL_LZMA
|
|
|
|
#include "../../../../lib/decompress_unlzma.c"
|
|
|
|
#endif
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
static void scroll(void)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
2008-02-20 16:19:10 -07:00
|
|
|
memcpy(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
|
|
|
|
for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
|
2005-04-16 16:20:36 -06:00
|
|
|
vidmem[i] = ' ';
|
|
|
|
}
|
|
|
|
|
2008-06-18 12:04:35 -06:00
|
|
|
static void __putstr(int error, const char *s)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
2008-02-20 16:19:10 -07:00
|
|
|
int x, y, pos;
|
2005-04-16 16:20:36 -06:00
|
|
|
char c;
|
|
|
|
|
2008-06-18 12:04:35 -06:00
|
|
|
#ifndef CONFIG_X86_VERBOSE_BOOTUP
|
|
|
|
if (!error)
|
|
|
|
return;
|
|
|
|
#endif
|
|
|
|
|
2008-01-30 05:33:38 -07:00
|
|
|
#ifdef CONFIG_X86_32
|
2008-05-29 16:31:14 -06:00
|
|
|
if (real_mode->screen_info.orig_video_mode == 0 &&
|
|
|
|
lines == 0 && cols == 0)
|
2007-10-21 17:41:35 -06:00
|
|
|
return;
|
2008-01-30 05:33:38 -07:00
|
|
|
#endif
|
2007-10-21 17:41:35 -06:00
|
|
|
|
2008-05-29 16:31:14 -06:00
|
|
|
x = real_mode->screen_info.orig_x;
|
|
|
|
y = real_mode->screen_info.orig_y;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-02-20 16:19:10 -07:00
|
|
|
while ((c = *s++) != '\0') {
|
|
|
|
if (c == '\n') {
|
2005-04-16 16:20:36 -06:00
|
|
|
x = 0;
|
2008-02-20 16:19:10 -07:00
|
|
|
if (++y >= lines) {
|
2005-04-16 16:20:36 -06:00
|
|
|
scroll();
|
|
|
|
y--;
|
|
|
|
}
|
|
|
|
} else {
|
2008-08-02 13:23:36 -06:00
|
|
|
vidmem[(x + cols * y) * 2] = c;
|
2008-02-20 16:19:10 -07:00
|
|
|
if (++x >= cols) {
|
2005-04-16 16:20:36 -06:00
|
|
|
x = 0;
|
2008-02-20 16:19:10 -07:00
|
|
|
if (++y >= lines) {
|
2005-04-16 16:20:36 -06:00
|
|
|
scroll();
|
|
|
|
y--;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-05-29 16:31:14 -06:00
|
|
|
real_mode->screen_info.orig_x = x;
|
|
|
|
real_mode->screen_info.orig_y = y;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
pos = (x + cols * y) * 2; /* Update cursor position */
|
2008-01-30 05:30:05 -07:00
|
|
|
outb(14, vidport);
|
|
|
|
outb(0xff & (pos >> 9), vidport+1);
|
|
|
|
outb(15, vidport);
|
|
|
|
outb(0xff & (pos >> 1), vidport+1);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2008-02-20 16:19:10 -07:00
|
|
|
static void *memset(void *s, int c, unsigned n)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
int i;
|
2008-01-30 05:33:23 -07:00
|
|
|
char *ss = s;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-08-02 13:23:36 -06:00
|
|
|
for (i = 0; i < n; i++)
|
|
|
|
ss[i] = c;
|
2005-04-16 16:20:36 -06:00
|
|
|
return s;
|
|
|
|
}
|
|
|
|
|
2009-01-04 14:46:17 -07:00
|
|
|
void *memcpy(void *dest, const void *src, unsigned n)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
int i;
|
2008-01-30 05:33:23 -07:00
|
|
|
const char *s = src;
|
|
|
|
char *d = dest;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-08-02 13:23:36 -06:00
|
|
|
for (i = 0; i < n; i++)
|
|
|
|
d[i] = s[i];
|
2006-06-26 05:57:53 -06:00
|
|
|
return dest;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void error(char *x)
|
|
|
|
{
|
2008-06-18 12:04:35 -06:00
|
|
|
__putstr(1, "\n\n");
|
|
|
|
__putstr(1, x);
|
|
|
|
__putstr(1, "\n\n -- System halted");
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-01-30 05:32:31 -07:00
|
|
|
while (1)
|
|
|
|
asm("hlt");
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
2008-02-13 13:54:58 -07:00
|
|
|
static void parse_elf(void *output)
|
|
|
|
{
|
|
|
|
#ifdef CONFIG_X86_64
|
|
|
|
Elf64_Ehdr ehdr;
|
|
|
|
Elf64_Phdr *phdrs, *phdr;
|
|
|
|
#else
|
|
|
|
Elf32_Ehdr ehdr;
|
|
|
|
Elf32_Phdr *phdrs, *phdr;
|
|
|
|
#endif
|
|
|
|
void *dest;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
memcpy(&ehdr, output, sizeof(ehdr));
|
2008-02-20 16:19:10 -07:00
|
|
|
if (ehdr.e_ident[EI_MAG0] != ELFMAG0 ||
|
2008-02-13 13:54:58 -07:00
|
|
|
ehdr.e_ident[EI_MAG1] != ELFMAG1 ||
|
|
|
|
ehdr.e_ident[EI_MAG2] != ELFMAG2 ||
|
2008-02-20 16:19:10 -07:00
|
|
|
ehdr.e_ident[EI_MAG3] != ELFMAG3) {
|
2008-02-13 13:54:58 -07:00
|
|
|
error("Kernel is not a valid ELF file");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2008-05-29 16:31:15 -06:00
|
|
|
if (!quiet)
|
|
|
|
putstr("Parsing ELF... ");
|
2008-02-13 13:54:58 -07:00
|
|
|
|
|
|
|
phdrs = malloc(sizeof(*phdrs) * ehdr.e_phnum);
|
|
|
|
if (!phdrs)
|
|
|
|
error("Failed to allocate space for phdrs");
|
|
|
|
|
|
|
|
memcpy(phdrs, output + ehdr.e_phoff, sizeof(*phdrs) * ehdr.e_phnum);
|
|
|
|
|
2008-02-20 16:19:10 -07:00
|
|
|
for (i = 0; i < ehdr.e_phnum; i++) {
|
2008-02-13 13:54:58 -07:00
|
|
|
phdr = &phdrs[i];
|
|
|
|
|
|
|
|
switch (phdr->p_type) {
|
|
|
|
case PT_LOAD:
|
|
|
|
#ifdef CONFIG_RELOCATABLE
|
|
|
|
dest = output;
|
|
|
|
dest += (phdr->p_paddr - LOAD_PHYSICAL_ADDR);
|
|
|
|
#else
|
2008-02-20 16:19:10 -07:00
|
|
|
dest = (void *)(phdr->p_paddr);
|
2008-02-13 13:54:58 -07:00
|
|
|
#endif
|
|
|
|
memcpy(dest,
|
|
|
|
output + phdr->p_offset,
|
|
|
|
phdr->p_filesz);
|
|
|
|
break;
|
|
|
|
default: /* Ignore other PT_* */ break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-01-30 05:33:38 -07:00
|
|
|
asmlinkage void decompress_kernel(void *rmode, memptr heap,
|
2008-02-20 21:03:48 -07:00
|
|
|
unsigned char *input_data,
|
|
|
|
unsigned long input_len,
|
|
|
|
unsigned char *output)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
real_mode = rmode;
|
|
|
|
|
2008-05-29 16:31:15 -06:00
|
|
|
if (real_mode->hdr.loadflags & QUIET_FLAG)
|
|
|
|
quiet = 1;
|
|
|
|
|
2008-05-29 16:31:14 -06:00
|
|
|
if (real_mode->screen_info.orig_video_mode == 7) {
|
2005-04-16 16:20:36 -06:00
|
|
|
vidmem = (char *) 0xb0000;
|
|
|
|
vidport = 0x3b4;
|
|
|
|
} else {
|
|
|
|
vidmem = (char *) 0xb8000;
|
|
|
|
vidport = 0x3d4;
|
|
|
|
}
|
|
|
|
|
2008-05-29 16:31:14 -06:00
|
|
|
lines = real_mode->screen_info.orig_video_lines;
|
|
|
|
cols = real_mode->screen_info.orig_video_cols;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-01-30 05:33:38 -07:00
|
|
|
free_mem_ptr = heap; /* Heap */
|
2008-04-08 04:54:30 -06:00
|
|
|
free_mem_end_ptr = heap + BOOT_HEAP_SIZE;
|
2006-12-06 18:14:04 -07:00
|
|
|
|
2008-01-30 05:33:38 -07:00
|
|
|
#ifdef CONFIG_X86_64
|
2008-02-20 21:03:48 -07:00
|
|
|
if ((unsigned long)output & (__KERNEL_ALIGN - 1))
|
2008-01-30 05:33:38 -07:00
|
|
|
error("Destination address not 2M aligned");
|
2008-02-20 21:03:48 -07:00
|
|
|
if ((unsigned long)output >= 0xffffffffffUL)
|
2008-01-30 05:33:38 -07:00
|
|
|
error("Destination address too large");
|
|
|
|
#else
|
2008-02-20 21:03:48 -07:00
|
|
|
if ((u32)output & (CONFIG_PHYSICAL_ALIGN - 1))
|
2006-12-06 18:14:04 -07:00
|
|
|
error("Destination address not CONFIG_PHYSICAL_ALIGN aligned");
|
2008-01-30 05:33:38 -07:00
|
|
|
if (heap > ((-__PAGE_OFFSET-(512<<20)-1) & 0x7fffffff))
|
2006-12-06 18:14:04 -07:00
|
|
|
error("Destination address too large");
|
|
|
|
#ifndef CONFIG_RELOCATABLE
|
2006-12-06 18:14:04 -07:00
|
|
|
if ((u32)output != LOAD_PHYSICAL_ADDR)
|
2006-12-06 18:14:04 -07:00
|
|
|
error("Wrong destination address");
|
2008-01-30 05:33:38 -07:00
|
|
|
#endif
|
2006-12-06 18:14:04 -07:00
|
|
|
#endif
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2008-05-29 16:31:15 -06:00
|
|
|
if (!quiet)
|
|
|
|
putstr("\nDecompressing Linux... ");
|
2009-01-04 14:46:17 -07:00
|
|
|
decompress(input_data, input_len, NULL, NULL, output, NULL, error);
|
2008-02-13 13:54:58 -07:00
|
|
|
parse_elf(output);
|
2008-05-29 16:31:15 -06:00
|
|
|
if (!quiet)
|
|
|
|
putstr("done.\nBooting the kernel.\n");
|
2006-12-06 18:14:04 -07:00
|
|
|
return;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|