patch-2.1.79 linux/arch/ppc/chrpboot/main.c

• Lines: 159
• Date: Mon Jan 12 15:18:13 1998
• Orig file: v2.1.78/linux/arch/ppc/chrpboot/main.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.78/linux/arch/ppc/chrpboot/main.c linux/arch/ppc/chrpboot/main.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright (C) Paul Mackerras 1997.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include "nonstdio.h"
+#include "zlib.h"
+
+extern void *finddevice(const char *);
+extern int getprop(void *, const char *, void *, int);
+void gunzip(void *, int, unsigned char *, int *);
+
+#define get_16be(x)	(*(unsigned short *)(x))
+#define get_32be(x)	(*(unsigned *)(x))
+
+#define RAM_START	0x90000000
+#define RAM_END		0x90800000	/* only 8M mapped with BATs */
+
+#define RAM_FREE	0x90540000	/* after image of chrpboot */
+#define PROG_START	0x90010000
+
+char *avail_ram;
+char *end_avail;
+
+extern char image_data[];
+extern int image_len;
+extern char initrd_data[];
+extern int initrd_len;
+
+
+chrpboot(int a1, int a2, void *prom)
+{
+    int ns, oh, i;
+    unsigned sa, len;
+    void *dst;
+    unsigned char *im;
+    unsigned initrd_start, initrd_size;
+    
+    printf("chrpboot starting\n\r");
+    setup_bats();
+
+    if (initrd_len) {
+	initrd_size = initrd_len;
+	initrd_start = (RAM_END - initrd_size) & ~0xFFF;
+	a1 = initrd_start;
+	a2 = initrd_size;
+	printf("initial ramdisk at %x (%u bytes)\n\r", initrd_start,
+	       initrd_size);
+	memcpy((char *)initrd_start, initrd_data, initrd_size);
+	end_avail = (char *)initrd_start;
+    } else
+	end_avail = (char *) RAM_END;
+    im = image_data;
+    len = image_len;
+    dst = (void *) PROG_START;
+
+    if (im[0] == 0x1f && im[1] == 0x8b) {
+	void *cp = (void *) RAM_FREE;
+	avail_ram = (void *) (RAM_FREE + ((len + 7) & -8));
+	memcpy(cp, im, len);
+	printf("gunzipping... ");
+	gunzip(dst, 0x400000, cp, &len);
+	printf("done\n\r");
+
+    } else {
+	memmove(dst, im, len);
+    }
+
+    flush_cache(dst, len);
+
+    sa = PROG_START+12;
+    printf("start address = 0x%x\n\r", sa);
+
+#if 0
+    pause();
+#endif
+    (*(void (*)())sa)(a1, a2, prom, 0, 0);
+
+    printf("returned?\n\r");
+
+    pause();
+}
+
+void *zalloc(void *x, unsigned items, unsigned size)
+{
+    void *p = avail_ram;
+
+    size *= items;
+    size = (size + 7) & -8;
+    avail_ram += size;
+    if (avail_ram > end_avail) {
+	printf("oops... out of memory\n\r");
+	pause();
+    }
+    return p;
+}
+
+void zfree(void *x, void *addr, unsigned nb)
+{
+}
+
+#define HEAD_CRC	2
+#define EXTRA_FIELD	4
+#define ORIG_NAME	8
+#define COMMENT		0x10
+#define RESERVED	0xe0
+
+#define DEFLATED	8
+
+void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
+{
+    z_stream s;
+    int r, i, flags;
+
+    /* skip header */
+    i = 10;
+    flags = src[3];
+    if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
+	printf("bad gzipped data\n\r");
+	exit();
+    }
+    if ((flags & EXTRA_FIELD) != 0)
+	i = 12 + src[10] + (src[11] << 8);
+    if ((flags & ORIG_NAME) != 0)
+	while (src[i++] != 0)
+	    ;
+    if ((flags & COMMENT) != 0)
+	while (src[i++] != 0)
+	    ;
+    if ((flags & HEAD_CRC) != 0)
+	i += 2;
+    if (i >= *lenp) {
+	printf("gunzip: ran out of data in header\n\r");
+	exit();
+    }
+
+    s.zalloc = zalloc;
+    s.zfree = zfree;
+    r = inflateInit2(&s, -MAX_WBITS);
+    if (r != Z_OK) {
+	printf("inflateInit2 returned %d\n\r", r);
+	exit();
+    }
+    s.next_in = src + i;
+    s.avail_in = *lenp - i;
+    s.next_out = dst;
+    s.avail_out = dstlen;
+    r = inflate(&s, Z_FINISH);
+    if (r != Z_OK && r != Z_STREAM_END) {
+	printf("inflate returned %d\n\r", r);
+	exit();
+    }
+    *lenp = s.next_out - (unsigned char *) dst;
+    inflateEnd(&s);
+}