1 files changed, 101 insertions, 0 deletions
diff --git a/arch/ppc/boot/openfirmware/coffmain.c b/arch/ppc/boot/openfirmware/coffmain.c
new file mode 100644
index 0000000..04ba9d5
--- /dev/null
+++ b/arch/ppc/boot/openfirmware/coffmain.c
@@ -0,0 +1,101 @@
+/*
+ * 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 <linux/string.h>
+#include <asm/processor.h>
+#include <asm/page.h>
+
+#include "nonstdio.h"
+#include "of1275.h"
+
+/* Passed from the linker */
+extern char __image_begin, __image_end;
+extern char __ramdisk_begin[], __ramdisk_end;
+extern char _start, _end;
+
+extern char image_data[], initrd_data[];
+extern int initrd_len, image_len;
+extern unsigned int heap_max;
+extern void flush_cache(void *start, unsigned int len);
+extern void gunzip(void *, int, unsigned char *, int *);
+extern void make_bi_recs(unsigned long addr, char *name, unsigned int mach,
+		unsigned int progend);
+extern void setup_bats(unsigned long start);
+
+char *avail_ram;
+char *begin_avail, *end_avail;
+char *avail_high;
+
+#define SCRATCH_SIZE	(128 << 10)
+
+static char heap[SCRATCH_SIZE];
+
+static unsigned long ram_start = 0;
+static unsigned long ram_end = 0x1000000;
+
+static unsigned long prog_start = 0x900000;
+static unsigned long prog_size = 0x700000;
+
+typedef void (*kernel_start_t)(int, int, void *);
+
+void boot(int a1, int a2, void *prom)
+{
+    unsigned sa, len;
+    void *dst;
+    unsigned char *im;
+    unsigned initrd_start, initrd_size;
+
+    printf("coffboot starting: loaded at 0x%p\n", &_start);
+    setup_bats(ram_start);
+
+    initrd_size = (char *)(&__ramdisk_end) - (char *)(&__ramdisk_begin);
+    if (initrd_size) {
+	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%p (%x bytes)\n\r",
+	       initrd_start, (char *)(&__ramdisk_begin), initrd_size);
+	memcpy((char *)initrd_start, (char *)(&__ramdisk_begin), initrd_size);
+	prog_size = initrd_start - prog_start;
+    } else
+	a2 = 0xdeadbeef;
+
+    im = (char *)(&__image_begin);
+    len = (char *)(&__image_end) - (char *)(&__image_begin);
+    /* claim 4MB starting at PROG_START */
+    claim(prog_start, prog_size, 0);
+    map(prog_start, prog_start, prog_size);
+    dst = (void *) prog_start;
+    if (im[0] == 0x1f && im[1] == 0x8b) {
+	/* set up scratch space */
+	begin_avail = avail_high = avail_ram = heap;
+	end_avail = heap + sizeof(heap);
+	printf("heap at 0x%p\n", avail_ram);
+	printf("gunzipping (0x%p <- 0x%p:0x%p)...", dst, im, im+len);
+	gunzip(dst, prog_size, im, &len);
+	printf("done %u bytes\n", len);
+	printf("%u bytes of heap consumed, max in use %u\n",
+	       avail_high - begin_avail, heap_max);
+    } else {
+	memmove(dst, im, len);
+    }
+
+    flush_cache(dst, len);
+    make_bi_recs(((unsigned long) dst + len), "coffboot", _MACH_Pmac,
+		    (prog_start + prog_size));
+
+    sa = (unsigned long)prog_start;
+    printf("start address = 0x%x\n", sa);
+
+    (*(kernel_start_t)sa)(a1, a2, prom);
+
+    printf("returned?\n");
+
+    pause();
+}