371 lines
7.1 KiB
C
371 lines
7.1 KiB
C
/*
|
|
* Definitions and wrapper functions for kernel decompressor
|
|
*
|
|
* (C) 2017 Helge Deller <deller@gmx.de>
|
|
*/
|
|
|
|
#include <linux/uaccess.h>
|
|
#include <linux/elf.h>
|
|
#include <asm/unaligned.h>
|
|
#include <asm/page.h>
|
|
#include "sizes.h"
|
|
|
|
/*
|
|
* gzip declarations
|
|
*/
|
|
#define STATIC static
|
|
|
|
#undef memmove
|
|
#define memmove memmove
|
|
#define memzero(s, n) memset((s), 0, (n))
|
|
|
|
#define malloc malloc_gzip
|
|
#define free free_gzip
|
|
|
|
/* Symbols defined by linker scripts */
|
|
extern char input_data[];
|
|
extern int input_len;
|
|
/* output_len is inserted by the linker possibly at an unaligned address */
|
|
extern char output_len;
|
|
extern char _text, _end;
|
|
extern char _bss, _ebss;
|
|
extern char _startcode_end;
|
|
extern void startup_continue(void *entry, unsigned long cmdline,
|
|
unsigned long rd_start, unsigned long rd_end) __noreturn;
|
|
|
|
void error(char *m) __noreturn;
|
|
|
|
static unsigned long free_mem_ptr;
|
|
static unsigned long free_mem_end_ptr;
|
|
|
|
#ifdef CONFIG_KERNEL_GZIP
|
|
#include "../../../../lib/decompress_inflate.c"
|
|
#endif
|
|
|
|
#ifdef CONFIG_KERNEL_BZIP2
|
|
#include "../../../../lib/decompress_bunzip2.c"
|
|
#endif
|
|
|
|
#ifdef CONFIG_KERNEL_LZ4
|
|
#include "../../../../lib/decompress_unlz4.c"
|
|
#endif
|
|
|
|
#ifdef CONFIG_KERNEL_LZMA
|
|
#include "../../../../lib/decompress_unlzma.c"
|
|
#endif
|
|
|
|
#ifdef CONFIG_KERNEL_LZO
|
|
#include "../../../../lib/decompress_unlzo.c"
|
|
#endif
|
|
|
|
#ifdef CONFIG_KERNEL_XZ
|
|
#include "../../../../lib/decompress_unxz.c"
|
|
#endif
|
|
|
|
void *memmove(void *dest, const void *src, size_t n)
|
|
{
|
|
const char *s = src;
|
|
char *d = dest;
|
|
|
|
if (d <= s) {
|
|
while (n--)
|
|
*d++ = *s++;
|
|
} else {
|
|
d += n;
|
|
s += n;
|
|
while (n--)
|
|
*--d = *--s;
|
|
}
|
|
return dest;
|
|
}
|
|
|
|
void *memset(void *s, int c, size_t count)
|
|
{
|
|
char *xs = (char *)s;
|
|
|
|
while (count--)
|
|
*xs++ = c;
|
|
return s;
|
|
}
|
|
|
|
void *memcpy(void *d, const void *s, size_t len)
|
|
{
|
|
char *dest = (char *)d;
|
|
const char *source = (const char *)s;
|
|
|
|
while (len--)
|
|
*dest++ = *source++;
|
|
return d;
|
|
}
|
|
|
|
size_t strlen(const char *s)
|
|
{
|
|
const char *sc;
|
|
|
|
for (sc = s; *sc != '\0'; ++sc)
|
|
;
|
|
return sc - s;
|
|
}
|
|
|
|
char *strchr(const char *s, int c)
|
|
{
|
|
while (*s) {
|
|
if (*s == (char)c)
|
|
return (char *)s;
|
|
++s;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int puts(const char *s)
|
|
{
|
|
const char *nuline = s;
|
|
|
|
while ((nuline = strchr(s, '\n')) != NULL) {
|
|
if (nuline != s)
|
|
pdc_iodc_print(s, nuline - s);
|
|
pdc_iodc_print("\r\n", 2);
|
|
s = nuline + 1;
|
|
}
|
|
if (*s != '\0')
|
|
pdc_iodc_print(s, strlen(s));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int putchar(int c)
|
|
{
|
|
char buf[2];
|
|
|
|
buf[0] = c;
|
|
buf[1] = '\0';
|
|
puts(buf);
|
|
return c;
|
|
}
|
|
|
|
void __noreturn error(char *x)
|
|
{
|
|
if (x) puts(x);
|
|
puts("\n -- System halted\n");
|
|
while (1) /* wait forever */
|
|
;
|
|
}
|
|
|
|
static int print_num(unsigned long num, int base)
|
|
{
|
|
const char hex[] = "0123456789abcdef";
|
|
char str[40];
|
|
int i = sizeof(str)-1;
|
|
|
|
str[i--] = '\0';
|
|
do {
|
|
str[i--] = hex[num % base];
|
|
num = num / base;
|
|
} while (num);
|
|
|
|
if (base == 16) {
|
|
str[i--] = 'x';
|
|
str[i] = '0';
|
|
} else i++;
|
|
puts(&str[i]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int printf(const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
int i = 0;
|
|
|
|
va_start(args, fmt);
|
|
|
|
while (fmt[i]) {
|
|
if (fmt[i] != '%') {
|
|
put:
|
|
putchar(fmt[i++]);
|
|
continue;
|
|
}
|
|
|
|
if (fmt[++i] == '%')
|
|
goto put;
|
|
print_num(va_arg(args, unsigned long),
|
|
fmt[i] == 'x' ? 16:10);
|
|
++i;
|
|
}
|
|
|
|
va_end(args);
|
|
return 0;
|
|
}
|
|
|
|
/* helper functions for libgcc */
|
|
void abort(void)
|
|
{
|
|
error("aborted.");
|
|
}
|
|
|
|
#undef malloc
|
|
void *malloc(size_t size)
|
|
{
|
|
return malloc_gzip(size);
|
|
}
|
|
|
|
#undef free
|
|
void free(void *ptr)
|
|
{
|
|
return free_gzip(ptr);
|
|
}
|
|
|
|
|
|
static void flush_data_cache(char *start, unsigned long length)
|
|
{
|
|
char *end = start + length;
|
|
|
|
do {
|
|
asm volatile("fdc 0(%0)" : : "r" (start));
|
|
asm volatile("fic 0(%%sr0,%0)" : : "r" (start));
|
|
start += 16;
|
|
} while (start < end);
|
|
asm volatile("fdc 0(%0)" : : "r" (end));
|
|
|
|
asm ("sync");
|
|
}
|
|
|
|
static void parse_elf(void *output)
|
|
{
|
|
#ifdef CONFIG_64BIT
|
|
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));
|
|
if (ehdr.e_ident[EI_MAG0] != ELFMAG0 ||
|
|
ehdr.e_ident[EI_MAG1] != ELFMAG1 ||
|
|
ehdr.e_ident[EI_MAG2] != ELFMAG2 ||
|
|
ehdr.e_ident[EI_MAG3] != ELFMAG3) {
|
|
error("Kernel is not a valid ELF file");
|
|
return;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
printf("Parsing ELF... ");
|
|
#endif
|
|
|
|
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);
|
|
|
|
for (i = 0; i < ehdr.e_phnum; i++) {
|
|
phdr = &phdrs[i];
|
|
|
|
switch (phdr->p_type) {
|
|
case PT_LOAD:
|
|
dest = (void *)((unsigned long) phdr->p_paddr &
|
|
(__PAGE_OFFSET_DEFAULT-1));
|
|
memmove(dest, output + phdr->p_offset, phdr->p_filesz);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
free(phdrs);
|
|
}
|
|
|
|
unsigned long decompress_kernel(unsigned int started_wide,
|
|
unsigned int command_line,
|
|
const unsigned int rd_start,
|
|
const unsigned int rd_end)
|
|
{
|
|
char *output;
|
|
unsigned long vmlinux_addr, vmlinux_len;
|
|
unsigned long kernel_addr, kernel_len;
|
|
|
|
#ifdef CONFIG_64BIT
|
|
parisc_narrow_firmware = 0;
|
|
#endif
|
|
|
|
set_firmware_width_unlocked();
|
|
|
|
putchar('D'); /* if you get this D and no more, string storage */
|
|
/* in $GLOBAL$ is wrong or %dp is wrong */
|
|
puts("ecompressing Linux... ");
|
|
|
|
/* where the final bits are stored */
|
|
kernel_addr = KERNEL_BINARY_TEXT_START;
|
|
kernel_len = __pa(SZ_end) - __pa(SZparisc_kernel_start);
|
|
if ((unsigned long) &_startcode_end > kernel_addr)
|
|
error("Bootcode overlaps kernel code");
|
|
|
|
/*
|
|
* Calculate addr to where the vmlinux ELF file shall be decompressed.
|
|
* Assembly code in head.S positioned the stack directly behind bss, so
|
|
* leave 2 MB for the stack.
|
|
*/
|
|
vmlinux_addr = (unsigned long) &_ebss + 2*1024*1024;
|
|
vmlinux_len = get_unaligned_le32(&output_len);
|
|
output = (char *) vmlinux_addr;
|
|
|
|
/*
|
|
* Initialize free_mem_ptr and free_mem_end_ptr.
|
|
*/
|
|
free_mem_ptr = vmlinux_addr + vmlinux_len;
|
|
|
|
/* Limit memory for bootoader to 1GB */
|
|
#define ARTIFICIAL_LIMIT (1*1024*1024*1024)
|
|
free_mem_end_ptr = PAGE0->imm_max_mem;
|
|
if (free_mem_end_ptr > ARTIFICIAL_LIMIT)
|
|
free_mem_end_ptr = ARTIFICIAL_LIMIT;
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
/* if we have ramdisk this is at end of memory */
|
|
if (rd_start && rd_start < free_mem_end_ptr)
|
|
free_mem_end_ptr = rd_start;
|
|
#endif
|
|
|
|
if (free_mem_ptr >= free_mem_end_ptr) {
|
|
int free_ram;
|
|
free_ram = (free_mem_ptr >> 20) + 1;
|
|
if (free_ram < 32)
|
|
free_ram = 32;
|
|
printf("\nKernel requires at least %d MB RAM.\n",
|
|
free_ram);
|
|
error(NULL);
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
printf("\n");
|
|
printf("startcode_end = %x\n", &_startcode_end);
|
|
printf("commandline = %x\n", command_line);
|
|
printf("rd_start = %x\n", rd_start);
|
|
printf("rd_end = %x\n", rd_end);
|
|
|
|
printf("free_ptr = %x\n", free_mem_ptr);
|
|
printf("free_ptr_end = %x\n", free_mem_end_ptr);
|
|
|
|
printf("input_data = %x\n", input_data);
|
|
printf("input_len = %x\n", input_len);
|
|
printf("output = %x\n", output);
|
|
printf("output_len = %x\n", vmlinux_len);
|
|
printf("kernel_addr = %x\n", kernel_addr);
|
|
printf("kernel_len = %x\n", kernel_len);
|
|
#endif
|
|
|
|
__decompress(input_data, input_len, NULL, NULL,
|
|
output, 0, NULL, error);
|
|
parse_elf(output);
|
|
|
|
output = (char *) kernel_addr;
|
|
flush_data_cache(output, kernel_len);
|
|
|
|
printf("done.\nBooting the kernel.\n");
|
|
|
|
return (unsigned long) output;
|
|
}
|