1 files changed, 126 insertions, 0 deletions

diff --git a/arch/mips/boot/compressed/decompress.c b/arch/mips/boot/compressed/decompress.c
new file mode 100644
index 000000000000..67330c2f7318
--- /dev/null
+++ b/arch/mips/boot/compressed/decompress.c
@@ -0,0 +1,126 @@
+/*
+ * Misc. bootloader code for many machines.
+ *
+ * Copyright 2001 MontaVista Software Inc.
+ * Author: Matt Porter <mporter@mvista.com> Derived from
+ * arch/ppc/boot/prep/misc.c
+ *
+ * Copyright (C) 2009 Lemote, Inc. & Institute of Computing Technology
+ * Author: Wu Zhangjin <wuzj@lemote.com>
+ *
+ * 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/types.h>
+#include <linux/kernel.h>
+
+#include <asm/addrspace.h>
+
+/* These two variables specify the free mem region
+ * that can be used for temporary malloc area
+ */
+unsigned long free_mem_ptr;
+unsigned long free_mem_end_ptr;
+char *zimage_start;
+
+/* The linker tells us where the image is. */
+extern unsigned char __image_begin, __image_end;
+extern unsigned char __ramdisk_begin, __ramdisk_end;
+unsigned long initrd_size;
+
+/* debug interfaces  */
+extern void puts(const char *s);
+extern void puthex(unsigned long long val);
+
+void error(char *x)
+{
+        puts("\n\n");
+        puts(x);
+        puts("\n\n -- System halted");
+
+        while (1)
+                ;       /* Halt */
+}
+
+/* activate the code for pre-boot environment */
+#define STATIC static
+
+#ifdef CONFIG_KERNEL_GZIP
+void *memcpy(void *dest, const void *src, size_t n)
+{
+        int i;
+        const char *s = src;
+        char *d = dest;
+
+        for (i = 0; i < n; i++)
+                d[i] = s[i];
+        return dest;
+}
+#include "../../../../lib/decompress_inflate.c"
+#endif
+
+#ifdef CONFIG_KERNEL_BZIP2
+void *memset(void *s, int c, size_t n)
+{
+        int i;
+        char *ss = s;
+
+        for (i = 0; i < n; i++)
+                ss[i] = c;
+        return s;
+}
+#include "../../../../lib/decompress_bunzip2.c"
+#endif
+
+#ifdef CONFIG_KERNEL_LZMA
+#include "../../../../lib/decompress_unlzma.c"
+#endif
+
+void decompress_kernel(unsigned long boot_heap_start)
+{
+        int zimage_size;
+
+        /*
+         * We link ourself to an arbitrary low address.  When we run, we
+         * relocate outself to that address.  __image_beign points to
+         * the part of the image where the zImage is. -- Tom
+         */
+        zimage_start = (char *)(unsigned long)(&__image_begin);
+        zimage_size = (unsigned long)(&__image_end) -
+            (unsigned long)(&__image_begin);
+
+        /*
+         * The zImage and initrd will be between start and _end, so they've
+         * already been moved once.  We're good to go now. -- Tom
+         */
+        puts("zimage at:     ");
+        puthex((unsigned long)zimage_start);
+        puts(" ");
+        puthex((unsigned long)(zimage_size + zimage_start));
+        puts("\n");
+
+        if (initrd_size) {
+                puts("initrd at:     ");
+                puthex((unsigned long)(&__ramdisk_begin));
+                puts(" ");
+                puthex((unsigned long)(&__ramdisk_end));
+                puts("\n");
+        }
+
+        /* this area are prepared for mallocing when decompressing */
+        free_mem_ptr = boot_heap_start;
+        free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
+
+        /* Display standard Linux/MIPS boot prompt for kernel args */
+        puts("Uncompressing Linux at load address ");
+        puthex(VMLINUX_LOAD_ADDRESS_ULL);
+        puts("\n");
+        /* Decompress the kernel with according algorithm */
+        decompress(zimage_start, zimage_size, 0, 0,
+                   (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error);
+        /* FIXME: is there a need to flush cache here? */
+        puts("Now, booting the kernel...\n");
+}