patch-2.4.5 linux/arch/ppc/boot/chrp/main.c

• Lines: 199
• Date: Thu May 24 15:02:06 2001
• Orig file: v2.4.4/linux/arch/ppc/boot/chrp/main.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.4/linux/arch/ppc/boot/chrp/main.c linux/arch/ppc/boot/chrp/main.c
@@ -0,0 +1,198 @@
+/*
+ * BK Id: SCCS/s.main.c 1.7 05/18/01 06:20:29 patch
+ */
+/*
+ * 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"
+#include <asm/bootinfo.h>
+#include <asm/processor.h>
+#include <asm/page.h>
+
+extern void *finddevice(const char *);
+extern int getprop(void *, const char *, void *, int);
+void gunzip(void *, int, unsigned char *, int *);
+
+#define RAM_START	0x00000000
+#define RAM_END		(64<<20)
+
+#define BOOT_START	((unsigned long)_start)
+#define BOOT_END	((unsigned long)(_end + 0xFFF) & ~0xFFF)
+
+#define RAM_FREE	((unsigned long)(_end+0x1000)&~0xFFF)
+#define PROG_START	0x00010000
+
+char *avail_ram;
+char *end_avail;
+
+extern char _end[];
+extern char image_data[];
+extern int image_len;
+extern char initrd_data[];
+extern int initrd_len;
+extern char sysmap_data[];
+extern int sysmap_len;
+
+static char scratch[1024<<10];	/* 1MB of scratch space for gunzip */
+
+chrpboot(int a1, int a2, void *prom)
+{
+    int ns, oh, i;
+    unsigned sa, len;
+    void *dst;
+    unsigned char *im;
+    unsigned initrd_start, initrd_size;
+    extern char _start;
+    
+    printf("chrpboot starting: loaded at 0x%x\n\r", &_start);
+
+    if (initrd_len) {
+	initrd_size = initrd_len;
+	initrd_start = (RAM_END - initrd_size) & ~0xFFF;
+	a1 = initrd_start;
+	a2 = initrd_size;
+	claim(initrd_start, RAM_END - initrd_start, 0);
+	printf("initial ramdisk moving 0x%x <- 0x%x (%x bytes)\n\r",
+	       initrd_start, initrd_data, initrd_size);
+	memcpy((char *)initrd_start, initrd_data, initrd_size);
+    }
+
+    im = image_data;
+    len = image_len;
+    /* claim 4MB starting at PROG_START */
+    claim(PROG_START, (4<<20) - PROG_START, 0);
+    dst = (void *) PROG_START;
+    if (im[0] == 0x1f && im[1] == 0x8b) {
+	avail_ram = scratch;
+	end_avail = scratch + sizeof(scratch);
+	printf("gunzipping (0x%x <- 0x%x:0x%0x)...", dst, im, im+len);
+	gunzip(dst, 0x400000, im, &len);
+	printf("done %u bytes\n\r", len);
+    } else {
+	memmove(dst, im, len);
+    }
+
+    flush_cache(dst, len);
+    
+    sa = (unsigned long)PROG_START;
+    printf("start address = 0x%x\n\r", sa);
+
+    {
+	    struct bi_record *rec;
+	    
+	    rec = (struct bi_record *)_ALIGN((unsigned long)dst+len+(1<<20)-1,(1<<20));
+
+	    rec->tag = BI_FIRST;
+	    rec->size = sizeof(struct bi_record);
+	    rec = (struct bi_record *)((unsigned long)rec + rec->size);
+	    
+	    rec->tag = BI_BOOTLOADER_ID;
+	    sprintf( (char *)rec->data, "chrpboot");
+	    rec->size = sizeof(struct bi_record) + strlen("chrpboot") + 1;
+	    rec = (struct bi_record *)((unsigned long)rec + rec->size);
+	    
+	    rec->tag = BI_MACHTYPE;
+	    rec->data[0] = _MACH_chrp;
+	    rec->data[1] = 1;
+	    rec->size = sizeof(struct bi_record) + sizeof(unsigned long);
+	    rec = (struct bi_record *)((unsigned long)rec + rec->size);
+#if 0
+	    rec->tag = BI_SYSMAP;
+	    rec->data[0] = (unsigned long)sysmap_data;
+	    rec->data[1] = sysmap_len;
+	    rec->size = sizeof(struct bi_record) + sizeof(unsigned long);
+	    rec = (struct bi_record *)((unsigned long)rec + rec->size);
+#endif
+	    rec->tag = BI_LAST;
+	    rec->size = sizeof(struct bi_record);
+	    rec = (struct bi_record *)((unsigned long)rec + rec->size);
+    }
+    (*(void (*)())sa)(a1, a2, prom);
+
+    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)
+{
+    nb = (nb + 7) & -8;
+    if (addr == (avail_ram - nb)) {
+	avail_ram -= 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 msg: %s\n\r", r, s.msg);
+	exit();
+    }
+    *lenp = s.next_out - (unsigned char *) dst;
+    inflateEnd(&s);
+}