patch-2.3.30 linux/arch/ppc/treeboot/main.c

• Lines: 210
• Date: Sat Nov 27 15:41:59 1999
• Orig file: v2.3.29/linux/arch/ppc/treeboot/main.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.29/linux/arch/ppc/treeboot/main.c linux/arch/ppc/treeboot/main.c
@@ -0,0 +1,209 @@
+/*
+ *    Copyright (c) 1997 Paul Mackerras <paulus@cs.anu.edu.au>
+ *      Initial Power Macintosh COFF version.
+ *    Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu>
+ *      Modifications for an ELF-based IBM evaluation board version.
+ *
+ *    Module name: main.c
+ *
+ *    Description:
+ *      This module does most of the real work for the boot loader. It
+ *      checks the variables holding the absolute start address and size
+ *      of the Linux kernel "image" and initial RAM disk "initrd" sections
+ *      and if they are present, moves them to their "proper" locations.
+ *
+ *      For the Linux kernel, "proper" is physical address 0x00000000.
+ *      For the RAM disk, "proper" is the image's size below the top
+ *      of physical memory. The Linux kernel may be in either raw
+ *      binary form or compressed with GNU zip (aka gzip).
+ *
+ *    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"
+#include "irSect.h"
+
+
+/* Preprocessor Defines */
+
+#define	RAM_SIZE	(4 * 1024 * 1024)
+
+#define	RAM_PBASE	0x00000000
+#define	RAM_PEND	(RAM_PBASE + RAM_SIZE)
+
+#define	RAM_VBASE	0xC0000000
+#define	RAM_VEND	(RAM_VBASE + RAM_SIZE)
+
+#define	RAM_START	RAM_PBASE
+#define	RAM_END		RAM_PEND
+#define	RAM_FREE	(imageSect_start + imageSect_size + initrdSect_size)
+
+#define	PROG_START	RAM_START
+
+
+/* Function Macros */
+
+#define	ALIGN_UP(x, align)	(((x) + ((align) - 1)) & ~((align) - 1))
+
+
+/* Global Variables */
+
+/* Needed by zalloc and zfree for allocating memory */
+
+char *avail_ram;	/* Indicates start of RAM available for heap */
+char *end_avail;	/* Indicates end of RAM available for heap */
+
+
+/* Function Prototypes */
+
+void *zalloc(void *x, unsigned items, unsigned size);
+void zfree(void *x, void *addr, unsigned nb);
+
+void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp);
+
+void printf () {}
+void pause () {}
+void exit () {}
+
+
+void start(void)
+{
+    void *options;
+    int ns, oh, i;
+    unsigned sa, len;
+    void *dst;
+    unsigned char *im;
+    unsigned initrd_start, initrd_size;
+
+    /* setup_bats(RAM_START); */
+
+    /* Init RAM disk (initrd) section */
+
+    if (initrdSect_start != 0 && (initrd_size = initrdSect_size) != 0) {
+        initrd_start = (RAM_END - initrd_size) & ~0xFFF;
+
+	printf("Initial RAM disk at 0x%08x (%u bytes)\n",
+	       initrd_start, initrd_size);
+
+	memcpy((char *)initrd_start,
+	       (char *)(initrdSect_start),
+	       initrdSect_size);
+
+	end_avail = (char *)initrd_start;
+    } else {
+	end_avail = (char *)RAM_END;
+    }
+
+    /* Linux kernel image section */
+	
+    im = (unsigned char *)(imageSect_start);
+    len = imageSect_size;
+    dst = (void *)PROG_START;
+
+    /* Check for the gzip archive magic numbers */
+
+    if (im[0] == 0x1f && im[1] == 0x8b) {
+
+        /* The gunzip routine needs everything nice and aligned */
+
+	void *cp = (void *)ALIGN_UP(RAM_FREE, 8);
+	avail_ram = (void *)(cp + ALIGN_UP(len, 8));
+	memcpy(cp, im, len);
+
+	/* I'm not sure what the 0x200000 parameter is for, but it works. */
+
+	gunzip(dst, 0x200000, cp, &len);
+    } else {
+	memmove(dst, im, len);
+    }
+
+    /* flush_cache(dst, len); */
+
+    sa = (unsigned long)dst;
+
+    (*(void (*)())sa)();
+
+    pause();
+}
+
+void *zalloc(void *x, unsigned items, unsigned size)
+{
+    void *p = avail_ram;
+
+    size *= items;
+    size = ALIGN_UP(size, 8);
+    avail_ram += size;
+    if (avail_ram > end_avail) {
+	printf("oops... out of memory\n");
+	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");
+	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");
+	exit();
+    }
+    printf("done 1\n");
+    s.zalloc = zalloc;
+    s.zfree = zfree;
+    r = inflateInit2(&s, -MAX_WBITS);
+    if (r != Z_OK) {
+	printf("inflateInit2 returned %d\n", r);
+	exit();
+    }
+    s.next_in = src + i;
+    s.avail_in = *lenp - i;
+    s.next_out = dst;
+    s.avail_out = dstlen;
+    printf("doing inflate\n");
+    r = inflate(&s, Z_FINISH);
+    printf("done inflate\n");
+    if (r != Z_OK && r != Z_STREAM_END) {
+	printf("inflate returned %d\n", r);
+	exit();
+    }
+    *lenp = s.next_out - (unsigned char *) dst;
+    printf("doing end\n");
+    inflateEnd(&s);
+}