diff options
Diffstat (limited to 'arch/cris/arch-v10/boot/compressed/misc.c')
| -rw-r--r-- | arch/cris/arch-v10/boot/compressed/misc.c | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/arch/cris/arch-v10/boot/compressed/misc.c b/arch/cris/arch-v10/boot/compressed/misc.c new file mode 100644 index 000000000000..1b5e83f1f846 --- /dev/null +++ b/arch/cris/arch-v10/boot/compressed/misc.c @@ -0,0 +1,273 @@ +/* + * misc.c + * + * $Id: misc.c,v 1.6 2003/10/27 08:04:31 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/config.h> + +#include <linux/types.h> +#include <asm/arch/svinto.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 void +puts(const char *s) +{ +#ifndef CONFIG_ETRAX_DEBUG_PORT_NULL + while(*s) { +#ifdef CONFIG_ETRAX_DEBUG_PORT0 + while(!(*R_SERIAL0_STATUS & (1 << 5))) ; + *R_SERIAL0_TR_DATA = *s++; +#endif +#ifdef CONFIG_ETRAX_DEBUG_PORT1 + while(!(*R_SERIAL1_STATUS & (1 << 5))) ; + *R_SERIAL1_TR_DATA = *s++; +#endif +#ifdef CONFIG_ETRAX_DEBUG_PORT2 + while(!(*R_SERIAL2_STATUS & (1 << 5))) ; + *R_SERIAL2_TR_DATA = *s++; +#endif +#ifdef CONFIG_ETRAX_DEBUG_PORT3 + while(!(*R_SERIAL3_STATUS & (1 << 5))) ; + *R_SERIAL3_TR_DATA = *s++; +#endif + } +#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; +} + +void +decompress_kernel() +{ + char revision; + + /* input_data is set in head.S */ + inbuf = input_data; + +#ifdef CONFIG_ETRAX_DEBUG_PORT0 + *R_SERIAL0_XOFF = 0; + *R_SERIAL0_BAUD = 0x99; + *R_SERIAL0_TR_CTRL = 0x40; +#endif +#ifdef CONFIG_ETRAX_DEBUG_PORT1 + *R_SERIAL1_XOFF = 0; + *R_SERIAL1_BAUD = 0x99; + *R_SERIAL1_TR_CTRL = 0x40; +#endif +#ifdef CONFIG_ETRAX_DEBUG_PORT2 + *R_GEN_CONFIG = 0x08; + *R_SERIAL2_XOFF = 0; + *R_SERIAL2_BAUD = 0x99; + *R_SERIAL2_TR_CTRL = 0x40; +#endif +#ifdef CONFIG_ETRAX_DEBUG_PORT3 + *R_GEN_CONFIG = 0x100; + *R_SERIAL3_XOFF = 0; + *R_SERIAL3_BAUD = 0x99; + *R_SERIAL3_TR_CTRL = 0x40; +#endif + + setup_normal_output_buffer(); + + makecrc(); + + __asm__ volatile ("move vr,%0" : "=rm" (revision)); + if (revision < 10) + { + puts("You need an ETRAX 100LX to run linux 2.6\n"); + while(1); + } + + puts("Uncompressing Linux...\n"); + gunzip(); + puts("Done. Now booting the kernel.\n"); +} |