1 files changed, 207 insertions, 0 deletions

diff --git a/arch/alpha/boot/misc.c b/arch/alpha/boot/misc.c
new file mode 100644
index 000000000000..1d65adf5691e
--- /dev/null
+++ b/arch/alpha/boot/misc.c
@@ -0,0 +1,207 @@
+/*
+ * 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
+ *
+ * Modified for ARM Linux by Russell King
+ *
+ * Nicolas Pitre <nico@visuaide.com>  1999/04/14 :
+ *  For this code to run directly from Flash, all constant variables must
+ *  be marked with 'const' and all other variables initialized at run-time 
+ *  only.  This way all non constant variables will end up in the bss segment,
+ *  which should point to addresses in RAM and cleared to 0 on start.
+ *  This allows for a much quicker boot time.
+ *
+ * Modified for Alpha, from the ARM version, by Jay Estabrook 2003.
+ */
+
+#include <linux/kernel.h>
+
+#include <asm/uaccess.h>
+
+#define memzero(s,n)    memset ((s),0,(n))
+#define puts            srm_printk
+extern long srm_printk(const char *, ...)
+     __attribute__ ((format (printf, 1, 2)));
+
+/*
+ * gzip delarations
+ */
+#define OF(args)  args
+#define STATIC static
+
+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;             /* 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 */
+
+#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 **);
+
+static char *input_data;
+static int  input_data_size;
+
+static uch *output_data;
+static ulg output_ptr;
+static ulg bytes_out;
+
+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 **);
+
+extern int end;
+static ulg free_mem_ptr;
+static ulg free_mem_ptr_end;
+
+#define HEAP_SIZE 0x2000
+
+#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_ptr_end)
+                error("Out of memory");
+        return p;
+}
+
+static void free(void *where)
+{ /* gzip_mark & gzip_release do the free */
+}
+
+static void gzip_mark(void **ptr)
+{
+        *ptr = (void *) free_mem_ptr;
+}
+
+static void gzip_release(void **ptr)
+{
+        free_mem_ptr = (long) *ptr;
+}
+
+/* ===========================================================================
+ * Fill the input buffer. This is called only when the buffer is empty
+ * and at least one byte is really needed.
+ */
+int fill_inbuf(void)
+{
+        if (insize != 0)
+                error("ran out of input data");
+
+        inbuf = input_data;
+        insize = input_data_size;
+
+        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.)
+ */
+void flush_window(void)
+{
+        ulg c = crc;
+        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;
+/*      puts("."); */
+}
+
+static void error(char *x)
+{
+        puts("\n\n");
+        puts(x);
+        puts("\n\n -- System halted");
+
+        while(1);       /* Halt */
+}
+
+unsigned int
+decompress_kernel(void *output_start,
+                  void *input_start,
+                  size_t ksize,
+                  size_t kzsize)
+{
+        output_data             = (uch *)output_start;
+        input_data              = (uch *)input_start;
+        input_data_size         = kzsize; /* use compressed size */
+
+        /* FIXME FIXME FIXME */
+        free_mem_ptr            = (ulg)output_start + ksize;
+        free_mem_ptr_end        = (ulg)output_start + ksize + 0x200000;
+        /* FIXME FIXME FIXME */
+
+        /* put in temp area to reduce initial footprint */
+        window = malloc(WSIZE);
+
+        makecrc();
+/*      puts("Uncompressing Linux..."); */
+        gunzip();
+/*      puts(" done, booting the kernel.\n"); */
+        return output_ptr;
+}