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-rw-r--r--target/image/ar7/src/loader.c140
1 files changed, 140 insertions, 0 deletions
diff --git a/target/image/ar7/src/loader.c b/target/image/ar7/src/loader.c
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+++ b/target/image/ar7/src/loader.c
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+/* inflate.c -- Not copyrighted 1992 by Mark Adler
+ version c10p1, 10 January 1993 */
+
+/*
+ * Adapted for booting Linux by Hannu Savolainen 1993
+ * based on gzip-1.0.3
+ *
+ * Nicolas Pitre <nico@visuaide.com>, 1999/04/14 :
+ * Little mods for all variable to reside either into rodata or bss segments
+ * by marking constant variables with 'const' and initializing all the others
+ * at run-time only. This allows for the kernel uncompressor to run
+ * directly from Flash or ROM memory on embeded systems.
+ */
+
+#include <linux/config.h>
+#include "gzip.h"
+#include "LzmaDecode.h"
+
+/* Function prototypes */
+unsigned char get_byte(void);
+int tikernelunzip(int,char *[], char *[]);
+static int tidecompress(uch *, uch *);
+
+void kernel_entry(int, char *[], char *[]);
+void (*ke)(int, char *[], char *[]); /* Gen reference to kernel function */
+void (*prnt)(unsigned int, char *); /* Gen reference to Yamon print function */
+void printf(char *ptr); /* Generate our own printf */
+
+int tikernelunzip(int argc, char *argv[], char *arge[])
+{
+ extern unsigned int _ftext;
+ extern uch kernelimage[];
+ uch *in, *out;
+ int status;
+
+ printf("Launching kernel decompressor.\n");
+
+ out = (unsigned char *) LOADADDR;
+ in = &(kernelimage[0]);
+
+ status = tidecompress(in, out);
+
+ if (status == 0) {
+ printf("Kernel decompressor was successful ... launching kernel.\n");
+
+ ke = ( void(*)(int, char *[],char*[]))kernel_entry;
+ (*ke)(argc,argv,arge);
+
+ return (0);
+ } else {
+ printf("Error in decompression.\n");
+ return(1);
+ }
+}
+
+#if 0
+char hex[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
+void print_i(int i)
+{
+ int j;
+ char buf[11];
+
+ buf[0] = '0';
+ buf[1] = 'x';
+ buf[10] = 0;
+
+ for (j = 0; j < 8; j++)
+ {
+ buf[2 + 7 - j] = hex[i & 0xf];
+ i = i >> 4;
+ }
+
+ printf(buf);
+}
+#endif
+
+int tidecompress(uch *indata, uch *outdata)
+{
+ extern unsigned int workspace;
+ extern unsigned char kernelimage[], kernelimage_end[];
+ unsigned int i; /* temp value */
+ unsigned int lc; /* literal context bits */
+ unsigned int lp; /* literal pos state bits */
+ unsigned int pb; /* pos state bits */
+ unsigned int osize; /* uncompressed size */
+ unsigned int wsize; /* window size */
+ unsigned int insize = kernelimage_end - kernelimage;
+ int status;
+
+ output_ptr = 0;
+ output_data = outdata;
+ input_data = indata;
+
+ /* lzma args */
+ i = get_byte();
+ lc = i % 9, i = i / 9;
+ lp = i % 5, pb = i / 5;
+
+ /* skip rest of the LZMA coder property */
+ for (i = 0; i < 4; i++)
+ get_byte();
+
+ /* read the lower half of uncompressed size in the header */
+ osize = ((unsigned int)get_byte()) +
+ ((unsigned int)get_byte() << 8) +
+ ((unsigned int)get_byte() << 16) +
+ ((unsigned int)get_byte() << 24);
+
+ /* skip rest of the header (upper half of uncompressed size) */
+ for (i = 0; i < 4; i++)
+ get_byte();
+
+ i = 0;
+ wsize = (LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp))) * sizeof(CProb);
+
+ if ((status = LzmaDecode((unsigned char *) &workspace, wsize, lc, lp, pb,
+ indata + 13, insize - 13, (unsigned char *) output_data, osize, &i)) == LZMA_RESULT_OK)
+ return 0;
+
+ return status;
+}
+
+
+void printf(char *ptr)
+{
+ unsigned int *tempptr = (unsigned int *)0x90000534;
+ prnt = ( void (*)(unsigned int, char *)) *tempptr;
+ (*prnt)(0,ptr);
+}
+
+unsigned char get_byte()
+{
+ unsigned char c;
+
+ c = *input_data;
+ input_data++;
+
+ return c;
+}
+