Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / mips / boot / compressed / decompress.c

diff --git a/kernel/arch/mips/boot/compressed/decompress.c b/kernel/arch/mips/boot/compressed/decompress.c
new file mode 100644 (file)
index 0000000..5483106
--- /dev/null
+++ b/kernel/arch/mips/boot/compressed/decompress.c
@@ -0,0 +1,119 @@
+/*
+ * Copyright 2001 MontaVista Software Inc.
+ * Author: Matt Porter <mporter@mvista.com>
+ *
+ * Copyright (C) 2009 Lemote, Inc.
+ * Author: Wu Zhangjin <wuzhangjin@gmail.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 <linux/string.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;
+
+/* The linker tells us where the image is. */
+extern unsigned char __image_begin, __image_end;
+
+/* debug interfaces  */
+#ifdef CONFIG_DEBUG_ZBOOT
+extern void puts(const char *s);
+extern void puthex(unsigned long long val);
+#else
+#define puts(s) do {} while (0)
+#define puthex(val) do {} while (0)
+#endif
+
+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
+#include "../../../../lib/decompress_inflate.c"
+#endif
+
+#ifdef CONFIG_KERNEL_BZIP2
+#include "../../../../lib/decompress_bunzip2.c"
+#endif
+
+#ifdef CONFIG_KERNEL_LZ4
+#include "../../../../lib/decompress_unlz4.c"
+#endif
+
+#ifdef CONFIG_KERNEL_LZMA
+#include "../../../../lib/decompress_unlzma.c"
+#endif
+
+#ifdef CONFIG_KERNEL_LZO
+#include "../../../../lib/decompress_unlzo.c"
+#endif
+
+#ifdef CONFIG_KERNEL_XZ
+#include "../../../../lib/decompress_unxz.c"
+#endif
+
+unsigned long __stack_chk_guard;
+
+void __stack_chk_guard_setup(void)
+{
+       __stack_chk_guard = 0x000a0dff;
+}
+
+void __stack_chk_fail(void)
+{
+       error("stack-protector: Kernel stack is corrupted\n");
+}
+
+void decompress_kernel(unsigned long boot_heap_start)
+{
+       unsigned long zimage_start, zimage_size;
+
+       __stack_chk_guard_setup();
+
+       zimage_start = (unsigned long)(&__image_begin);
+       zimage_size = (unsigned long)(&__image_end) -
+           (unsigned long)(&__image_begin);
+
+       puts("zimage at:     ");
+       puthex(zimage_start);
+       puts(" ");
+       puthex(zimage_size + zimage_start);
+       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 */
+       puts("Uncompressing Linux at load address ");
+       puthex(VMLINUX_LOAD_ADDRESS_ULL);
+       puts("\n");
+
+       /* Decompress the kernel with according algorithm */
+       decompress((char *)zimage_start, zimage_size, 0, 0,
+                  (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error);
+
+       /* FIXME: should we flush cache here? */
+       puts("Now, booting the kernel...\n");
+}