patch-2.4.10 linux/arch/ppc/boot/common/ofcommon.c

• Lines: 172
• Date: Tue Aug 28 06:58:33 2001
• Orig file: v2.4.9/linux/arch/ppc/boot/common/ofcommon.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.9/linux/arch/ppc/boot/common/ofcommon.c linux/arch/ppc/boot/common/ofcommon.c
@@ -0,0 +1,171 @@
+/*
+ * BK Id: SCCS/s.ofcommon.c 1.1 07/27/01 20:24:18 trini
+ *
+ * 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 "zlib.h"
+#include "nonstdio.h"
+#include <asm/bootinfo.h>
+#include <asm/page.h>
+
+extern int strcmp(const char *s1, const char *s2);
+extern char *avail_ram, *avail_high;
+extern char *end_avail;
+extern void claim(unsigned int virt, unsigned int size, unsigned int align);
+extern void pause(void);
+
+unsigned int heap_use, heap_max;
+
+struct memchunk {
+    unsigned int size;
+    struct memchunk *next;
+};
+
+static struct memchunk *freechunks;
+
+static void *zalloc(void *x, unsigned items, unsigned size)
+{
+    void *p;
+    struct memchunk **mpp, *mp;
+
+    size *= items;
+    size = (size + 7) & -8;
+    heap_use += size;
+    if (heap_use > heap_max)
+	heap_max = heap_use;
+    for (mpp = &freechunks; (mp = *mpp) != 0; mpp = &mp->next) {
+	if (mp->size == size) {
+	    *mpp = mp->next;
+	    return mp;
+	}
+    }
+    p = avail_ram;
+    avail_ram += size;
+    if (avail_ram > avail_high)
+	avail_high = avail_ram;
+    if (avail_ram > end_avail) {
+	printf("oops... out of memory\n\r");
+	pause();
+    }
+    return p;
+}
+
+static void zfree(void *x, void *addr, unsigned nb)
+{
+    struct memchunk *mp = addr;
+
+    nb = (nb + 7) & -8;
+    heap_use -= nb;
+    if (avail_ram == addr + nb) {
+	avail_ram = addr;
+	return;
+    }
+    mp->size = nb;
+    mp->next = freechunks;
+    freechunks = mp;
+}
+
+#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);
+}
+
+/* Make a bi_rec in OF.  We need to be passed a name for BI_BOOTLOADER_ID, 
+ * a machine type for BI_MACHTYPE, and the location where the end of the
+ * bootloader is (PROG_START + PROG_SIZE)
+ */
+void make_bi_recs(unsigned long addr, char *name, unsigned int mach,
+		unsigned long progend)
+{
+	struct bi_record *rec;
+
+	/* leave a 1MB gap then align to the next 1MB boundary */
+	addr = _ALIGN(addr+ (1<<20) - 1, (1<<20));
+	/* oldworld machine seem very unhappy about this. -- Tom */
+	if (addr >= progend)
+		claim(addr, 0x1000, 0);
+
+	rec = (struct bi_record *)addr;
+	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, name);
+	rec->size = sizeof(struct bi_record) + strlen(name) + 1;
+	rec = (struct bi_record *)((unsigned long)rec + rec->size);
+	    
+	rec->tag = BI_MACHTYPE;
+	rec->data[0] = mach;
+	rec->data[1] = 1;
+	rec->size = sizeof(struct bi_record) + 2 * sizeof(unsigned long);
+	rec = (struct bi_record *)((unsigned long)rec + rec->size);
+
+#ifdef SYSMAP_OFFSET
+	rec->tag = BI_SYSMAP;
+	rec->data[0] = SYSMAP_OFFSET;
+	rec->data[1] = SYSMAP_SIZE;
+	rec->size = sizeof(struct bi_record) + 2 * sizeof(unsigned long);
+	rec = (struct bi_record *)((unsigned long)rec + rec->size);
+#endif /* SYSMAP_OFFSET */
+	
+	rec->tag = BI_LAST;
+	rec->size = sizeof(struct bi_record);
+	rec = (struct bi_record *)((unsigned long)rec + rec->size);
+}