patch-2.4.2 linux/arch/cris/boot/compressed/misc.c

• Lines: 261
• Date: Tue Feb 13 14:13:43 2001
• Orig file: v2.4.1/linux/arch/cris/boot/compressed/misc.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.1/linux/arch/cris/boot/compressed/misc.c linux/arch/cris/boot/compressed/misc.c
@@ -0,0 +1,260 @@
+/*
+ * misc.c
+ *
+ * $Id: misc.c,v 1.3 2001/01/17 15:54:18 jonashg 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 etrax100.ld.
+ */
+
+#define KERNEL_LOAD_ADR 0x40004000
+
+#include <linux/config.h>
+#include <linux/types.h>
+#include <asm/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\n");
+
+	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_DEBUG_PORT_NULL
+	while(*s) {
+#ifdef CONFIG_DEBUG_PORT0
+		while(!(*R_SERIAL0_STATUS & (1 << 5))) ;
+		*R_SERIAL0_TR_DATA = *s++;
+#endif
+#ifdef CONFIG_DEBUG_PORT1
+		while(!(*R_SERIAL1_STATUS & (1 << 5))) ;
+		*R_SERIAL1_TR_DATA = *s++;
+#endif
+#ifdef CONFIG_DEBUG_PORT2
+		while(!(*R_SERIAL2_STATUS & (1 << 5))) ;
+		*R_SERIAL2_TR_DATA = *s++;
+#endif
+#ifdef CONFIG_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()
+{
+	/* input_data is set in head.S */
+	inbuf = input_data;
+
+#ifdef CONFIG_DEBUG_PORT0
+	*R_SERIAL0_XOFF = 0;
+	*R_SERIAL0_BAUD = 0x99;
+	*R_SERIAL0_TR_CTRL = 0x40;
+#endif
+#ifdef CONFIG_DEBUG_PORT1
+	*R_SERIAL1_XOFF = 0;
+	*R_SERIAL1_BAUD = 0x99;
+	*R_SERIAL1_TR_CTRL = 0x40;
+#endif
+#ifdef CONFIG_DEBUG_PORT2
+	*R_SERIAL2_XOFF = 0;
+	*R_SERIAL2_BAUD = 0x99;
+	*R_SERIAL2_TR_CTRL = 0x40;
+#endif
+#ifdef CONFIG_DEBUG_PORT3
+	*R_SERIAL3_XOFF = 0;
+	*R_SERIAL3_BAUD = 0x99;
+	*R_SERIAL3_TR_CTRL = 0x40;
+#endif
+       
+	setup_normal_output_buffer();
+
+	makecrc();
+	puts("Uncompressing Linux...\n");
+	gunzip();
+	puts("Done. Now booting the kernel.\n");
+}