blob: 11902697196d3f19027905d8cde5d4b25ab696bf [file] [log] [blame]
/*
* misc.c
*
* $Id: misc.c,v 1.8 2005/04/24 18:34:29 starvik Exp $
*
* 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
* adoptation for Linux/CRIS Axis Communications AB, 1999
*
*/
/* where the piggybacked kernel image expects itself to live.
* it is the same address we use when we network load an uncompressed
* image into DRAM, and it is the address the kernel is linked to live
* at by vmlinux.lds.S
*/
#define KERNEL_LOAD_ADR 0x40004000
#include <linux/types.h>
#include <asm/arch/hwregs/reg_rdwr.h>
#include <asm/arch/hwregs/reg_map.h>
#include <asm/arch/hwregs/ser_defs.h>
/*
* gzip declarations
*/
#define OF(args) args
#define STATIC static
void* memset(void* s, int c, size_t n);
void* memcpy(void* __dest, __const void* __src,
size_t __n);
#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 */
unsigned inptr = 0; /* index of next byte to be processed in inbuf
* After decompression it will contain the
* compressed size, and head.S will read it.
*/
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() inbuf[inptr++]
/* 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 **);
extern char *input_data; /* lives in head.S */
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 error(char *m);
static void gzip_mark(void **);
static void gzip_release(void **);
static void puts(const char *);
/* the "heap" is put directly after the BSS ends, at end */
extern int _end;
static long free_mem_ptr = (long)&_end;
#include "../../../../../lib/inflate.c"
static void *malloc(int size)
{
void *p;
if (size <0) error("Malloc error");
free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
p = (void *)free_mem_ptr;
free_mem_ptr += size;
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;
}
/* decompressor info and error messages to serial console */
static inline void
serout(const char *s, reg_scope_instances regi_ser)
{
reg_ser_rs_stat_din rs;
reg_ser_rw_dout dout = {.data = *s};
do {
rs = REG_RD(ser, regi_ser, rs_stat_din);
}
while (!rs.tr_rdy);/* Wait for tranceiver. */
REG_WR(ser, regi_ser, rw_dout, dout);
}
static void
puts(const char *s)
{
#ifndef CONFIG_ETRAX_DEBUG_PORT_NULL
while (*s) {
#ifdef CONFIG_ETRAX_DEBUG_PORT0
serout(s, regi_ser0);
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT1
serout(s, regi_ser1);
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT2
serout(s, regi_ser2);
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT3
serout(s, regi_ser3);
#endif
*s++;
}
/* CONFIG_ETRAX_DEBUG_PORT_NULL */
#endif
}
void*
memset(void* s, int c, size_t n)
{
int i;
char *ss = (char*)s;
for (i=0;i<n;i++) ss[i] = c;
}
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];
}
/* ===========================================================================
* Write the output window window[0..outcnt-1] and update crc and bytes_out.
* (Used for the decompressed data only.)
*/
static void
flush_window()
{
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
error(char *x)
{
puts("\n\n");
puts(x);
puts("\n\n -- System halted\n");
while(1); /* Halt */
}
void
setup_normal_output_buffer()
{
output_data = (char *)KERNEL_LOAD_ADR;
}
static inline void
serial_setup(reg_scope_instances regi_ser)
{
reg_ser_rw_xoff xoff;
reg_ser_rw_tr_ctrl tr_ctrl;
reg_ser_rw_rec_ctrl rec_ctrl;
reg_ser_rw_tr_baud_div tr_baud;
reg_ser_rw_rec_baud_div rec_baud;
/* Turn off XOFF. */
xoff = REG_RD(ser, regi_ser, rw_xoff);
xoff.chr = 0;
xoff.automatic = regk_ser_no;
REG_WR(ser, regi_ser, rw_xoff, xoff);
/* Set baudrate and stopbits. */
tr_ctrl = REG_RD(ser, regi_ser, rw_tr_ctrl);
rec_ctrl = REG_RD(ser, regi_ser, rw_rec_ctrl);
tr_baud = REG_RD(ser, regi_ser, rw_tr_baud_div);
rec_baud = REG_RD(ser, regi_ser, rw_rec_baud_div);
tr_ctrl.stop_bits = 1; /* 2 stop bits. */
/*
* The baudrate setup is a bit fishy, but in the end the tranceiver is
* set to 4800 and the receiver to 115200. The magic value is
* 29.493 MHz.
*/
tr_ctrl.base_freq = regk_ser_f29_493;
rec_ctrl.base_freq = regk_ser_f29_493;
tr_baud.div = (29493000 / 8) / 4800;
rec_baud.div = (29493000 / 8) / 115200;
REG_WR(ser, regi_ser, rw_tr_ctrl, tr_ctrl);
REG_WR(ser, regi_ser, rw_tr_baud_div, tr_baud);
REG_WR(ser, regi_ser, rw_rec_ctrl, rec_ctrl);
REG_WR(ser, regi_ser, rw_rec_baud_div, rec_baud);
}
void
decompress_kernel()
{
char revision;
/* input_data is set in head.S */
inbuf = input_data;
#ifdef CONFIG_ETRAX_DEBUG_PORT0
serial_setup(regi_ser0);
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT1
serial_setup(regi_ser1);
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT2
serial_setup(regi_ser2);
#endif
#ifdef CONFIG_ETRAX_DEBUG_PORT3
serial_setup(regi_ser3);
#endif
setup_normal_output_buffer();
makecrc();
__asm__ volatile ("move $vr,%0" : "=rm" (revision));
if (revision < 32)
{
puts("You need an ETRAX FS to run Linux 2.6/crisv32.\n");
while(1);
}
puts("Uncompressing Linux...\n");
gunzip();
puts("Done. Now booting the kernel.\n");
}