7e7f358c8f
This makes it possible for boot code to use screen_info without dragging in all of tty.h. Signed-off-by: Brian Gerst <bgerst@didntduck.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
381 lines
9 KiB
C
381 lines
9 KiB
C
/*
|
|
* misc.c
|
|
*
|
|
* This is a collection of several routines from gzip-1.0.3
|
|
* 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
|
|
*/
|
|
|
|
#include <linux/linkage.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/screen_info.h>
|
|
#include <asm/io.h>
|
|
#include <asm/page.h>
|
|
|
|
/*
|
|
* gzip declarations
|
|
*/
|
|
|
|
#define OF(args) args
|
|
#define STATIC static
|
|
|
|
#undef memset
|
|
#undef memcpy
|
|
|
|
/*
|
|
* Why do we do this? Don't ask me..
|
|
*
|
|
* Incomprehensible are the ways of bootloaders.
|
|
*/
|
|
static void* memset(void *, int, size_t);
|
|
static void* memcpy(void *, __const void *, size_t);
|
|
#define memzero(s, n) memset ((s), 0, (n))
|
|
|
|
typedef unsigned char uch;
|
|
typedef unsigned short ush;
|
|
typedef unsigned long ulg;
|
|
|
|
#define WSIZE 0x8000 /* Window size must be at least 32k, */
|
|
/* and a power of two */
|
|
|
|
static uch *inbuf; /* input buffer */
|
|
static uch window[WSIZE]; /* Sliding window buffer */
|
|
|
|
static unsigned insize = 0; /* valid bytes in inbuf */
|
|
static unsigned inptr = 0; /* index of next byte to be processed in inbuf */
|
|
static unsigned outcnt = 0; /* bytes in output buffer */
|
|
|
|
/* gzip flag byte */
|
|
#define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
|
|
#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
|
|
#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
|
|
#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
|
|
#define COMMENT 0x10 /* bit 4 set: file comment present */
|
|
#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
|
|
#define RESERVED 0xC0 /* bit 6,7: reserved */
|
|
|
|
#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
|
|
|
|
/* Diagnostic functions */
|
|
#ifdef DEBUG
|
|
# define Assert(cond,msg) {if(!(cond)) error(msg);}
|
|
# define Trace(x) fprintf x
|
|
# define Tracev(x) {if (verbose) fprintf x ;}
|
|
# define Tracevv(x) {if (verbose>1) fprintf x ;}
|
|
# define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
|
|
# define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
|
|
#else
|
|
# define Assert(cond,msg)
|
|
# define Trace(x)
|
|
# define Tracev(x)
|
|
# define Tracevv(x)
|
|
# define Tracec(c,x)
|
|
# define Tracecv(c,x)
|
|
#endif
|
|
|
|
static int fill_inbuf(void);
|
|
static void flush_window(void);
|
|
static void error(char *m);
|
|
static void gzip_mark(void **);
|
|
static void gzip_release(void **);
|
|
|
|
/*
|
|
* This is set up by the setup-routine at boot-time
|
|
*/
|
|
static unsigned char *real_mode; /* Pointer to real-mode data */
|
|
|
|
#define RM_EXT_MEM_K (*(unsigned short *)(real_mode + 0x2))
|
|
#ifndef STANDARD_MEMORY_BIOS_CALL
|
|
#define RM_ALT_MEM_K (*(unsigned long *)(real_mode + 0x1e0))
|
|
#endif
|
|
#define RM_SCREEN_INFO (*(struct screen_info *)(real_mode+0))
|
|
|
|
extern char input_data[];
|
|
extern int input_len;
|
|
|
|
static long bytes_out = 0;
|
|
static uch *output_data;
|
|
static unsigned long output_ptr = 0;
|
|
|
|
static void *malloc(int size);
|
|
static void free(void *where);
|
|
|
|
static void putstr(const char *);
|
|
|
|
extern int end;
|
|
static long free_mem_ptr = (long)&end;
|
|
static long free_mem_end_ptr;
|
|
|
|
#define INPLACE_MOVE_ROUTINE 0x1000
|
|
#define LOW_BUFFER_START 0x2000
|
|
#define LOW_BUFFER_MAX 0x90000
|
|
#define HEAP_SIZE 0x3000
|
|
static unsigned int low_buffer_end, low_buffer_size;
|
|
static int high_loaded =0;
|
|
static uch *high_buffer_start /* = (uch *)(((ulg)&end) + HEAP_SIZE)*/;
|
|
|
|
static char *vidmem = (char *)0xb8000;
|
|
static int vidport;
|
|
static int lines, cols;
|
|
|
|
#ifdef CONFIG_X86_NUMAQ
|
|
static void * xquad_portio = NULL;
|
|
#endif
|
|
|
|
#include "../../../../lib/inflate.c"
|
|
|
|
static void *malloc(int size)
|
|
{
|
|
void *p;
|
|
|
|
if (size <0) error("Malloc error");
|
|
if (free_mem_ptr <= 0) error("Memory error");
|
|
|
|
free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
|
|
|
|
p = (void *)free_mem_ptr;
|
|
free_mem_ptr += size;
|
|
|
|
if (free_mem_ptr >= free_mem_end_ptr)
|
|
error("Out of memory");
|
|
|
|
return p;
|
|
}
|
|
|
|
static void free(void *where)
|
|
{ /* Don't care */
|
|
}
|
|
|
|
static void gzip_mark(void **ptr)
|
|
{
|
|
*ptr = (void *) free_mem_ptr;
|
|
}
|
|
|
|
static void gzip_release(void **ptr)
|
|
{
|
|
free_mem_ptr = (long) *ptr;
|
|
}
|
|
|
|
static void scroll(void)
|
|
{
|
|
int i;
|
|
|
|
memcpy ( vidmem, vidmem + cols * 2, ( lines - 1 ) * cols * 2 );
|
|
for ( i = ( lines - 1 ) * cols * 2; i < lines * cols * 2; i += 2 )
|
|
vidmem[i] = ' ';
|
|
}
|
|
|
|
static void putstr(const char *s)
|
|
{
|
|
int x,y,pos;
|
|
char c;
|
|
|
|
x = RM_SCREEN_INFO.orig_x;
|
|
y = RM_SCREEN_INFO.orig_y;
|
|
|
|
while ( ( c = *s++ ) != '\0' ) {
|
|
if ( c == '\n' ) {
|
|
x = 0;
|
|
if ( ++y >= lines ) {
|
|
scroll();
|
|
y--;
|
|
}
|
|
} else {
|
|
vidmem [ ( x + cols * y ) * 2 ] = c;
|
|
if ( ++x >= cols ) {
|
|
x = 0;
|
|
if ( ++y >= lines ) {
|
|
scroll();
|
|
y--;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
RM_SCREEN_INFO.orig_x = x;
|
|
RM_SCREEN_INFO.orig_y = y;
|
|
|
|
pos = (x + cols * y) * 2; /* Update cursor position */
|
|
outb_p(14, vidport);
|
|
outb_p(0xff & (pos >> 9), vidport+1);
|
|
outb_p(15, vidport);
|
|
outb_p(0xff & (pos >> 1), vidport+1);
|
|
}
|
|
|
|
static void* memset(void* s, int c, size_t n)
|
|
{
|
|
int i;
|
|
char *ss = (char*)s;
|
|
|
|
for (i=0;i<n;i++) ss[i] = c;
|
|
return s;
|
|
}
|
|
|
|
static void* memcpy(void* __dest, __const void* __src,
|
|
size_t __n)
|
|
{
|
|
int i;
|
|
char *d = (char *)__dest, *s = (char *)__src;
|
|
|
|
for (i=0;i<__n;i++) d[i] = s[i];
|
|
return __dest;
|
|
}
|
|
|
|
/* ===========================================================================
|
|
* Fill the input buffer. This is called only when the buffer is empty
|
|
* and at least one byte is really needed.
|
|
*/
|
|
static int fill_inbuf(void)
|
|
{
|
|
if (insize != 0) {
|
|
error("ran out of input data");
|
|
}
|
|
|
|
inbuf = input_data;
|
|
insize = input_len;
|
|
inptr = 1;
|
|
return inbuf[0];
|
|
}
|
|
|
|
/* ===========================================================================
|
|
* Write the output window window[0..outcnt-1] and update crc and bytes_out.
|
|
* (Used for the decompressed data only.)
|
|
*/
|
|
static void flush_window_low(void)
|
|
{
|
|
ulg c = crc; /* temporary variable */
|
|
unsigned n;
|
|
uch *in, *out, ch;
|
|
|
|
in = window;
|
|
out = &output_data[output_ptr];
|
|
for (n = 0; n < outcnt; n++) {
|
|
ch = *out++ = *in++;
|
|
c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
|
|
}
|
|
crc = c;
|
|
bytes_out += (ulg)outcnt;
|
|
output_ptr += (ulg)outcnt;
|
|
outcnt = 0;
|
|
}
|
|
|
|
static void flush_window_high(void)
|
|
{
|
|
ulg c = crc; /* temporary variable */
|
|
unsigned n;
|
|
uch *in, ch;
|
|
in = window;
|
|
for (n = 0; n < outcnt; n++) {
|
|
ch = *output_data++ = *in++;
|
|
if ((ulg)output_data == low_buffer_end) output_data=high_buffer_start;
|
|
c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
|
|
}
|
|
crc = c;
|
|
bytes_out += (ulg)outcnt;
|
|
outcnt = 0;
|
|
}
|
|
|
|
static void flush_window(void)
|
|
{
|
|
if (high_loaded) flush_window_high();
|
|
else flush_window_low();
|
|
}
|
|
|
|
static void error(char *x)
|
|
{
|
|
putstr("\n\n");
|
|
putstr(x);
|
|
putstr("\n\n -- System halted");
|
|
|
|
while(1); /* Halt */
|
|
}
|
|
|
|
#define STACK_SIZE (4096)
|
|
|
|
long user_stack [STACK_SIZE];
|
|
|
|
struct {
|
|
long * a;
|
|
short b;
|
|
} stack_start = { & user_stack [STACK_SIZE] , __BOOT_DS };
|
|
|
|
static void setup_normal_output_buffer(void)
|
|
{
|
|
#ifdef STANDARD_MEMORY_BIOS_CALL
|
|
if (RM_EXT_MEM_K < 1024) error("Less than 2MB of memory");
|
|
#else
|
|
if ((RM_ALT_MEM_K > RM_EXT_MEM_K ? RM_ALT_MEM_K : RM_EXT_MEM_K) < 1024) error("Less than 2MB of memory");
|
|
#endif
|
|
output_data = (char *)__PHYSICAL_START; /* Normally Points to 1M */
|
|
free_mem_end_ptr = (long)real_mode;
|
|
}
|
|
|
|
struct moveparams {
|
|
uch *low_buffer_start; int lcount;
|
|
uch *high_buffer_start; int hcount;
|
|
};
|
|
|
|
static void setup_output_buffer_if_we_run_high(struct moveparams *mv)
|
|
{
|
|
high_buffer_start = (uch *)(((ulg)&end) + HEAP_SIZE);
|
|
#ifdef STANDARD_MEMORY_BIOS_CALL
|
|
if (RM_EXT_MEM_K < (3*1024)) error("Less than 4MB of memory");
|
|
#else
|
|
if ((RM_ALT_MEM_K > RM_EXT_MEM_K ? RM_ALT_MEM_K : RM_EXT_MEM_K) <
|
|
(3*1024))
|
|
error("Less than 4MB of memory");
|
|
#endif
|
|
mv->low_buffer_start = output_data = (char *)LOW_BUFFER_START;
|
|
low_buffer_end = ((unsigned int)real_mode > LOW_BUFFER_MAX
|
|
? LOW_BUFFER_MAX : (unsigned int)real_mode) & ~0xfff;
|
|
low_buffer_size = low_buffer_end - LOW_BUFFER_START;
|
|
high_loaded = 1;
|
|
free_mem_end_ptr = (long)high_buffer_start;
|
|
if ( (__PHYSICAL_START + low_buffer_size) > ((ulg)high_buffer_start)) {
|
|
high_buffer_start = (uch *)(__PHYSICAL_START + low_buffer_size);
|
|
mv->hcount = 0; /* say: we need not to move high_buffer */
|
|
}
|
|
else mv->hcount = -1;
|
|
mv->high_buffer_start = high_buffer_start;
|
|
}
|
|
|
|
static void close_output_buffer_if_we_run_high(struct moveparams *mv)
|
|
{
|
|
if (bytes_out > low_buffer_size) {
|
|
mv->lcount = low_buffer_size;
|
|
if (mv->hcount)
|
|
mv->hcount = bytes_out - low_buffer_size;
|
|
} else {
|
|
mv->lcount = bytes_out;
|
|
mv->hcount = 0;
|
|
}
|
|
}
|
|
|
|
asmlinkage int decompress_kernel(struct moveparams *mv, void *rmode)
|
|
{
|
|
real_mode = rmode;
|
|
|
|
if (RM_SCREEN_INFO.orig_video_mode == 7) {
|
|
vidmem = (char *) 0xb0000;
|
|
vidport = 0x3b4;
|
|
} else {
|
|
vidmem = (char *) 0xb8000;
|
|
vidport = 0x3d4;
|
|
}
|
|
|
|
lines = RM_SCREEN_INFO.orig_video_lines;
|
|
cols = RM_SCREEN_INFO.orig_video_cols;
|
|
|
|
if (free_mem_ptr < 0x100000) setup_normal_output_buffer();
|
|
else setup_output_buffer_if_we_run_high(mv);
|
|
|
|
makecrc();
|
|
putstr("Uncompressing Linux... ");
|
|
gunzip();
|
|
putstr("Ok, booting the kernel.\n");
|
|
if (high_loaded) close_output_buffer_if_we_run_high(mv);
|
|
return high_loaded;
|
|
}
|