393 lines
9.2 KiB
C
393 lines
9.2 KiB
C
/* MN10300 Miscellaneous helper routines for kernel decompressor
|
|
*
|
|
* Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
|
|
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
|
|
* Modified by David Howells (dhowells@redhat.com)
|
|
* - Derived from arch/x86/boot/compressed/misc_32.c
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public Licence
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the Licence, or (at your option) any later version.
|
|
*/
|
|
#include <linux/compiler.h>
|
|
#include <asm/serial-regs.h>
|
|
#include "misc.h"
|
|
|
|
#ifndef CONFIG_GDBSTUB_ON_TTYSx
|
|
/* display 'Uncompressing Linux... ' messages on ttyS0 or ttyS1 */
|
|
#if 1 /* ttyS0 */
|
|
#define CYG_DEV_BASE 0xA6FB0000
|
|
#else /* ttyS1 */
|
|
#define CYG_DEV_BASE 0xA6FC0000
|
|
#endif
|
|
|
|
#define CYG_DEV_THR (*((volatile __u8*)(CYG_DEV_BASE + 0x00)))
|
|
#define CYG_DEV_MCR (*((volatile __u8*)(CYG_DEV_BASE + 0x10)))
|
|
#define SIO_MCR_DTR 0x01
|
|
#define SIO_MCR_RTS 0x02
|
|
#define CYG_DEV_LSR (*((volatile __u8*)(CYG_DEV_BASE + 0x14)))
|
|
#define SIO_LSR_THRE 0x20 /* transmitter holding register empty */
|
|
#define SIO_LSR_TEMT 0x40 /* transmitter register empty */
|
|
#define CYG_DEV_MSR (*((volatile __u8*)(CYG_DEV_BASE + 0x18)))
|
|
#define SIO_MSR_CTS 0x10 /* clear to send */
|
|
#define SIO_MSR_DSR 0x20 /* data set ready */
|
|
|
|
#define LSR_WAIT_FOR(STATE) \
|
|
do { while (!(CYG_DEV_LSR & SIO_LSR_##STATE)) {} } while (0)
|
|
#define FLOWCTL_QUERY(LINE) \
|
|
({ CYG_DEV_MSR & SIO_MSR_##LINE; })
|
|
#define FLOWCTL_WAIT_FOR(LINE) \
|
|
do { while (!(CYG_DEV_MSR & SIO_MSR_##LINE)) {} } while (0)
|
|
#define FLOWCTL_CLEAR(LINE) \
|
|
do { CYG_DEV_MCR &= ~SIO_MCR_##LINE; } while (0)
|
|
#define FLOWCTL_SET(LINE) \
|
|
do { CYG_DEV_MCR |= SIO_MCR_##LINE; } while (0)
|
|
#endif
|
|
|
|
/*
|
|
* gzip declarations
|
|
*/
|
|
|
|
#define OF(args) args
|
|
#define STATIC static
|
|
|
|
#undef memset
|
|
#undef memcpy
|
|
|
|
static inline void *memset(const void *s, int c, size_t n)
|
|
{
|
|
int i;
|
|
char *ss = (char *) s;
|
|
|
|
for (i = 0; i < n; i++)
|
|
ss[i] = c;
|
|
return (void *)s;
|
|
}
|
|
|
|
#define memzero(s, n) memset((s), 0, (n))
|
|
|
|
static inline void *memcpy(void *__dest, const void *__src, size_t __n)
|
|
{
|
|
int i;
|
|
const char *s = __src;
|
|
char *d = __dest;
|
|
|
|
for (i = 0; i < __n; i++)
|
|
d[i] = s[i];
|
|
return __dest;
|
|
}
|
|
|
|
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; /* valid bytes in inbuf */
|
|
static unsigned inptr; /* index of next byte to be processed in inbuf */
|
|
static unsigned outcnt; /* 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 */
|
|
|
|
/* 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(const char *) __attribute__((noreturn));
|
|
static void kputs(const char *);
|
|
|
|
static inline unsigned char get_byte(void)
|
|
{
|
|
unsigned char ch = inptr < insize ? inbuf[inptr++] : fill_inbuf();
|
|
|
|
#if 0
|
|
char hex[3];
|
|
hex[0] = ((ch & 0x0f) > 9) ?
|
|
((ch & 0x0f) + 'A' - 0xa) : ((ch & 0x0f) + '0');
|
|
hex[1] = ((ch >> 4) > 9) ?
|
|
((ch >> 4) + 'A' - 0xa) : ((ch >> 4) + '0');
|
|
hex[2] = 0;
|
|
kputs(hex);
|
|
#endif
|
|
return ch;
|
|
}
|
|
|
|
/*
|
|
* This is set up by the setup-routine at boot-time
|
|
*/
|
|
#define EXT_MEM_K (*(unsigned short *)0x90002)
|
|
#ifndef STANDARD_MEMORY_BIOS_CALL
|
|
#define ALT_MEM_K (*(unsigned long *) 0x901e0)
|
|
#endif
|
|
#define SCREEN_INFO (*(struct screen_info *)0x90000)
|
|
|
|
static long bytes_out;
|
|
static uch *output_data;
|
|
static unsigned long output_ptr;
|
|
|
|
|
|
static unsigned long free_mem_ptr = (unsigned long) &end;
|
|
static unsigned long free_mem_end_ptr = (unsigned long) &end + 0x90000;
|
|
|
|
#define INPLACE_MOVE_ROUTINE 0x1000
|
|
#define LOW_BUFFER_START 0x2000
|
|
#define LOW_BUFFER_END 0x90000
|
|
#define LOW_BUFFER_SIZE (LOW_BUFFER_END - LOW_BUFFER_START)
|
|
#define HEAP_SIZE 0x3000
|
|
static int high_loaded;
|
|
static uch *high_buffer_start /* = (uch *)(((ulg)&end) + HEAP_SIZE)*/;
|
|
|
|
static char *vidmem = (char *)0xb8000;
|
|
static int lines, cols;
|
|
|
|
#define BOOTLOADER_INFLATE
|
|
#include "../../../../lib/inflate.c"
|
|
|
|
static inline 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 inline void kputchar(unsigned char ch)
|
|
{
|
|
#ifdef CONFIG_MN10300_UNIT_ASB2305
|
|
while (SC0STR & SC01STR_TBF)
|
|
continue;
|
|
|
|
if (ch == 0x0a) {
|
|
SC0TXB = 0x0d;
|
|
while (SC0STR & SC01STR_TBF)
|
|
continue;
|
|
}
|
|
|
|
SC0TXB = ch;
|
|
|
|
#else
|
|
while (SC1STR & SC01STR_TBF)
|
|
continue;
|
|
|
|
if (ch == 0x0a) {
|
|
SC1TXB = 0x0d;
|
|
while (SC1STR & SC01STR_TBF)
|
|
continue;
|
|
}
|
|
|
|
SC1TXB = ch;
|
|
|
|
#endif
|
|
}
|
|
|
|
static void kputs(const char *s)
|
|
{
|
|
#ifdef CONFIG_DEBUG_DECOMPRESS_KERNEL
|
|
#ifndef CONFIG_GDBSTUB_ON_TTYSx
|
|
char ch;
|
|
|
|
FLOWCTL_SET(DTR);
|
|
|
|
while (*s) {
|
|
LSR_WAIT_FOR(THRE);
|
|
|
|
ch = *s++;
|
|
if (ch == 0x0a) {
|
|
CYG_DEV_THR = 0x0d;
|
|
LSR_WAIT_FOR(THRE);
|
|
}
|
|
CYG_DEV_THR = ch;
|
|
}
|
|
|
|
FLOWCTL_CLEAR(DTR);
|
|
#else
|
|
|
|
for (; *s; s++)
|
|
kputchar(*s);
|
|
|
|
#endif
|
|
#endif /* CONFIG_DEBUG_DECOMPRESS_KERNEL */
|
|
}
|
|
|
|
/* ===========================================================================
|
|
* 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()
|
|
{
|
|
if (insize != 0)
|
|
error("ran out of input data\n");
|
|
|
|
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(const char *x)
|
|
{
|
|
kputs("\n\n");
|
|
kputs(x);
|
|
kputs("\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], 0 };
|
|
|
|
void setup_normal_output_buffer(void)
|
|
{
|
|
#ifdef STANDARD_MEMORY_BIOS_CALL
|
|
if (EXT_MEM_K < 1024)
|
|
error("Less than 2MB of memory.\n");
|
|
#else
|
|
if ((ALT_MEM_K > EXT_MEM_K ? ALT_MEM_K : EXT_MEM_K) < 1024)
|
|
error("Less than 2MB of memory.\n");
|
|
#endif
|
|
output_data = (char *) 0x100000; /* Points to 1M */
|
|
}
|
|
|
|
struct moveparams {
|
|
uch *low_buffer_start;
|
|
int lcount;
|
|
uch *high_buffer_start;
|
|
int hcount;
|
|
};
|
|
|
|
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 (EXT_MEM_K < (3 * 1024))
|
|
error("Less than 4MB of memory.\n");
|
|
#else
|
|
if ((ALT_MEM_K > EXT_MEM_K ? ALT_MEM_K : EXT_MEM_K) < (3 * 1024))
|
|
error("Less than 4MB of memory.\n");
|
|
#endif
|
|
mv->low_buffer_start = output_data = (char *) LOW_BUFFER_START;
|
|
high_loaded = 1;
|
|
free_mem_end_ptr = (long) high_buffer_start;
|
|
if (0x100000 + LOW_BUFFER_SIZE > (ulg) high_buffer_start) {
|
|
high_buffer_start = (uch *)(0x100000 + 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;
|
|
}
|
|
|
|
void close_output_buffer_if_we_run_high(struct moveparams *mv)
|
|
{
|
|
mv->lcount = bytes_out;
|
|
if (bytes_out > LOW_BUFFER_SIZE) {
|
|
mv->lcount = LOW_BUFFER_SIZE;
|
|
if (mv->hcount)
|
|
mv->hcount = bytes_out - LOW_BUFFER_SIZE;
|
|
} else {
|
|
mv->hcount = 0;
|
|
}
|
|
}
|
|
|
|
#undef DEBUGFLAG
|
|
#ifdef DEBUGFLAG
|
|
int debugflag;
|
|
#endif
|
|
|
|
int decompress_kernel(struct moveparams *mv)
|
|
{
|
|
#ifdef DEBUGFLAG
|
|
while (!debugflag)
|
|
barrier();
|
|
#endif
|
|
|
|
output_data = (char *) CONFIG_KERNEL_TEXT_ADDRESS;
|
|
|
|
makecrc();
|
|
kputs("Uncompressing Linux... ");
|
|
gunzip();
|
|
kputs("Ok, booting the kernel.\n");
|
|
return 0;
|
|
}
|