1 files changed, 101 insertions, 0 deletions
diff --git a/arch/ppc/boot/openfirmware/chrpmain.c b/arch/ppc/boot/openfirmware/chrpmain.c
new file mode 100644
index 000000000000..6fb4f738728c
--- /dev/null
+++ b/arch/ppc/boot/openfirmware/chrpmain.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 "nonstdio.h"
+#include "of1275.h"
+#include <asm/processor.h>
+#include <asm/page.h>
+
+/* Passed from the linker */
+extern char __image_begin, __image_end;
+extern char __ramdisk_begin, __ramdisk_end;
+extern char _start, _end;
+
+extern unsigned int heap_max;
+extern void flush_cache(void *, unsigned long);
+extern void gunzip(void *, int, unsigned char *, int *);
+extern void make_bi_recs(unsigned long addr, char *name, unsigned int mach,
+		unsigned int progend);
+
+char *avail_ram;
+char *begin_avail, *end_avail;
+char *avail_high;
+
+#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
+#define PROG_SIZE	0x007f0000 /* 8MB */
+
+#define SCRATCH_SIZE	(128 << 10)
+
+static char scratch[SCRATCH_SIZE];	/* 1MB of scratch space for gunzip */
+
+typedef void (*kernel_start_t)(int, int, void *, unsigned int, unsigned int);
+
+void
+boot(int a1, int a2, void *prom)
+{
+    unsigned sa, len;
+    void *dst;
+    unsigned char *im;
+    unsigned int initrd_size, initrd_start;
+
+    printf("chrpboot starting: loaded at 0x%p\n\r", &_start);
+
+    initrd_size = &__ramdisk_end - &__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, &__ramdisk_begin, initrd_size);
+	memcpy((char *)initrd_start, &__ramdisk_begin, initrd_size);
+    } else {
+	initrd_start = 0;
+	initrd_size = 0;
+	a2 = 0xdeadbeef;
+    }
+
+    im = &__image_begin;
+    len = &__image_end - &__image_begin;
+    /* claim 4MB starting at PROG_START */
+    claim(PROG_START, PROG_SIZE - PROG_START, 0);
+    dst = (void *) PROG_START;
+    if (im[0] == 0x1f && im[1] == 0x8b) {
+	avail_ram = scratch;
+	begin_avail = avail_high = avail_ram;
+	end_avail = scratch + sizeof(scratch);
+	printf("gunzipping (0x%p <- 0x%p:0x%p)...", dst, im, im+len);
+	gunzip(dst, 0x400000, im, &len);
+	printf("done %u bytes\n\r", len);
+	printf("%u bytes of heap consumed, max in use %u\n\r",
+	       avail_high - begin_avail, heap_max);
+    } else {
+	memmove(dst, im, len);
+    }
+
+    flush_cache(dst, len);
+    make_bi_recs(((unsigned long) dst + len), "chrpboot", _MACH_chrp,
+		    (PROG_START + PROG_SIZE));
+
+    sa = PROG_START;
+    printf("start address = 0x%x\n\r", sa);
+
+    (*(kernel_start_t)sa)(a1, a2, prom, initrd_start, initrd_size);
+
+    printf("returned?\n\r");
+
+    pause();
+}