i386: move boot

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

8 files changed, 1299 insertions, 0 deletions

diff --git a/arch/x86/boot/compressed/.gitignore b/arch/x86/boot/compressed/.gitignore
new file mode 100644
index 000000000000..be0ed065249b
--- /dev/null
+++ b/arch/x86/boot/compressed/.gitignore
@@ -0,0 +1 @@
+relocs
diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
new file mode 100644
index 000000000000..76ab5caddf9a
--- /dev/null
+++ b/arch/x86/boot/compressed/Makefile
@@ -0,0 +1,5 @@
+ifeq ($(CONFIG_X86_32),y)
+include ${srctree}/arch/x86/boot/compressed/Makefile_32
+else
+include ${srctree}/arch/x86_64/boot/compressed/Makefile_64
+endif
diff --git a/arch/x86/boot/compressed/Makefile_32 b/arch/x86/boot/compressed/Makefile_32
new file mode 100644
index 000000000000..22613c652d22
--- /dev/null
+++ b/arch/x86/boot/compressed/Makefile_32
@@ -0,0 +1,50 @@
+#
+# linux/arch/x86/boot/compressed/Makefile
+#
+# create a compressed vmlinux image from the original vmlinux
+#
+
+targets         := vmlinux vmlinux.bin vmlinux.bin.gz head_32.o misc_32.o piggy.o \
+                        vmlinux.bin.all vmlinux.relocs
+EXTRA_AFLAGS    := -traditional
+
+LDFLAGS_vmlinux := -T
+hostprogs-y     := relocs
+
+CFLAGS  := -m32 -D__KERNEL__ $(LINUX_INCLUDE) -O2 \
+           -fno-strict-aliasing -fPIC \
+           $(call cc-option,-ffreestanding) \
+           $(call cc-option,-fno-stack-protector)
+LDFLAGS := -m elf_i386
+
+$(obj)/vmlinux: $(src)/vmlinux_32.lds $(obj)/head_32.o $(obj)/misc_32.o $(obj)/piggy.o FORCE
+        $(call if_changed,ld)
+        @:
+
+$(obj)/vmlinux.bin: vmlinux FORCE
+        $(call if_changed,objcopy)
+
+quiet_cmd_relocs = RELOCS  $@
+      cmd_relocs = $(obj)/relocs $< > $@;$(obj)/relocs --abs-relocs $<
+$(obj)/vmlinux.relocs: vmlinux $(obj)/relocs FORCE
+        $(call if_changed,relocs)
+
+vmlinux.bin.all-y := $(obj)/vmlinux.bin
+vmlinux.bin.all-$(CONFIG_RELOCATABLE) += $(obj)/vmlinux.relocs
+quiet_cmd_relocbin = BUILD   $@
+      cmd_relocbin = cat $(filter-out FORCE,$^) > $@
+$(obj)/vmlinux.bin.all: $(vmlinux.bin.all-y) FORCE
+        $(call if_changed,relocbin)
+
+ifdef CONFIG_RELOCATABLE
+$(obj)/vmlinux.bin.gz: $(obj)/vmlinux.bin.all FORCE
+        $(call if_changed,gzip)
+else
+$(obj)/vmlinux.bin.gz: $(obj)/vmlinux.bin FORCE
+        $(call if_changed,gzip)
+endif
+
+LDFLAGS_piggy.o := -r --format binary --oformat elf32-i386 -T
+
+$(obj)/piggy.o: $(src)/vmlinux_32.scr $(obj)/vmlinux.bin.gz FORCE
+        $(call if_changed,ld)
diff --git a/arch/x86/boot/compressed/head_32.S b/arch/x86/boot/compressed/head_32.S
new file mode 100644
index 000000000000..f35ea2237522
--- /dev/null
+++ b/arch/x86/boot/compressed/head_32.S
@@ -0,0 +1,180 @@
+/*
+ *  linux/boot/head.S
+ *
+ *  Copyright (C) 1991, 1992, 1993  Linus Torvalds
+ */
+
+/*
+ *  head.S contains the 32-bit startup code.
+ *
+ * NOTE!!! Startup happens at absolute address 0x00001000, which is also where
+ * the page directory will exist. The startup code will be overwritten by
+ * the page directory. [According to comments etc elsewhere on a compressed
+ * kernel it will end up at 0x1000 + 1Mb I hope so as I assume this. - AC]
+ *
+ * Page 0 is deliberately kept safe, since System Management Mode code in 
+ * laptops may need to access the BIOS data stored there.  This is also
+ * useful for future device drivers that either access the BIOS via VM86 
+ * mode.
+ */
+
+/*
+ * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
+ */
+.text
+
+#include <linux/linkage.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/boot.h>
+
+.section ".text.head","ax",@progbits
+        .globl startup_32
+
+startup_32:
+        cld
+        cli
+        movl $(__BOOT_DS),%eax
+        movl %eax,%ds
+        movl %eax,%es
+        movl %eax,%fs
+        movl %eax,%gs
+        movl %eax,%ss
+
+/* Calculate the delta between where we were compiled to run
+ * at and where we were actually loaded at.  This can only be done
+ * with a short local call on x86.  Nothing  else will tell us what
+ * address we are running at.  The reserved chunk of the real-mode
+ * data at 0x1e4 (defined as a scratch field) are used as the stack
+ * for this calculation. Only 4 bytes are needed.
+ */
+        leal (0x1e4+4)(%esi), %esp
+        call 1f
+1:      popl %ebp
+        subl $1b, %ebp
+
+/* %ebp contains the address we are loaded at by the boot loader and %ebx
+ * contains the address where we should move the kernel image temporarily
+ * for safe in-place decompression.
+ */
+
+#ifdef CONFIG_RELOCATABLE
+        movl    %ebp, %ebx
+        addl    $(CONFIG_PHYSICAL_ALIGN - 1), %ebx
+        andl    $(~(CONFIG_PHYSICAL_ALIGN - 1)), %ebx
+#else
+        movl $LOAD_PHYSICAL_ADDR, %ebx
+#endif
+
+        /* Replace the compressed data size with the uncompressed size */
+        subl input_len(%ebp), %ebx
+        movl output_len(%ebp), %eax
+        addl %eax, %ebx
+        /* Add 8 bytes for every 32K input block */
+        shrl $12, %eax
+        addl %eax, %ebx
+        /* Add 32K + 18 bytes of extra slack */
+        addl $(32768 + 18), %ebx
+        /* Align on a 4K boundary */
+        addl $4095, %ebx
+        andl $~4095, %ebx
+
+/* Copy the compressed kernel to the end of our buffer
+ * where decompression in place becomes safe.
+ */
+        pushl %esi
+        leal _end(%ebp), %esi
+        leal _end(%ebx), %edi
+        movl $(_end - startup_32), %ecx
+        std
+        rep
+        movsb
+        cld
+        popl %esi
+
+/* Compute the kernel start address.
+ */
+#ifdef CONFIG_RELOCATABLE
+        addl    $(CONFIG_PHYSICAL_ALIGN - 1), %ebp
+        andl    $(~(CONFIG_PHYSICAL_ALIGN - 1)), %ebp
+#else
+        movl    $LOAD_PHYSICAL_ADDR, %ebp
+#endif
+
+/*
+ * Jump to the relocated address.
+ */
+        leal relocated(%ebx), %eax
+        jmp *%eax
+.section ".text"
+relocated:
+
+/*
+ * Clear BSS
+ */
+        xorl %eax,%eax
+        leal _edata(%ebx),%edi
+        leal _end(%ebx), %ecx
+        subl %edi,%ecx
+        cld
+        rep
+        stosb
+
+/*
+ * Setup the stack for the decompressor
+ */
+        leal stack_end(%ebx), %esp
+
+/*
+ * Do the decompression, and jump to the new kernel..
+ */
+        movl output_len(%ebx), %eax
+        pushl %eax
+        pushl %ebp      # output address
+        movl input_len(%ebx), %eax
+        pushl %eax      # input_len
+        leal input_data(%ebx), %eax
+        pushl %eax      # input_data
+        leal _end(%ebx), %eax
+        pushl %eax      # end of the image as third argument
+        pushl %esi      # real mode pointer as second arg
+        call decompress_kernel
+        addl $20, %esp
+        popl %ecx
+
+#if CONFIG_RELOCATABLE
+/* Find the address of the relocations.
+ */
+        movl %ebp, %edi
+        addl %ecx, %edi
+
+/* Calculate the delta between where vmlinux was compiled to run
+ * and where it was actually loaded.
+ */
+        movl %ebp, %ebx
+        subl $LOAD_PHYSICAL_ADDR, %ebx
+        jz   2f         /* Nothing to be done if loaded at compiled addr. */
+/*
+ * Process relocations.
+ */
+
+1:      subl $4, %edi
+        movl 0(%edi), %ecx
+        testl %ecx, %ecx
+        jz 2f
+        addl %ebx, -__PAGE_OFFSET(%ebx, %ecx)
+        jmp 1b
+2:
+#endif
+
+/*
+ * Jump to the decompressed kernel.
+ */
+        xorl %ebx,%ebx
+        jmp *%ebp
+
+.bss
+.balign 4
+stack:
+        .fill 4096, 1, 0
+stack_end:
diff --git a/arch/x86/boot/compressed/misc_32.c b/arch/x86/boot/compressed/misc_32.c
new file mode 100644
index 000000000000..b28505c544c9
--- /dev/null
+++ b/arch/x86/boot/compressed/misc_32.c
@@ -0,0 +1,379 @@
+/*
+ * misc.c
+ * 
+ * This is a collection of several routines from gzip-1.0.3 
+ * adapted for Linux.
+ *
+ * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
+ * puts by Nick Holloway 1993, better puts by Martin Mares 1995
+ * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
+ */
+
+#undef CONFIG_PARAVIRT
+#include <linux/linkage.h>
+#include <linux/vmalloc.h>
+#include <linux/screen_info.h>
+#include <asm/io.h>
+#include <asm/page.h>
+#include <asm/boot.h>
+
+/* WARNING!!
+ * This code is compiled with -fPIC and it is relocated dynamically
+ * at run time, but no relocation processing is performed.
+ * This means that it is not safe to place pointers in static structures.
+ */
+
+/*
+ * Getting to provable safe in place decompression is hard.
+ * Worst case behaviours need to be analized.
+ * Background information:
+ *
+ * The file layout is:
+ *    magic[2]
+ *    method[1]
+ *    flags[1]
+ *    timestamp[4]
+ *    extraflags[1]
+ *    os[1]
+ *    compressed data blocks[N]
+ *    crc[4] orig_len[4]
+ *
+ * resulting in 18 bytes of non compressed data overhead.
+ *
+ * Files divided into blocks
+ * 1 bit (last block flag)
+ * 2 bits (block type)
+ *
+ * 1 block occurs every 32K -1 bytes or when there 50% compression has been achieved.
+ * The smallest block type encoding is always used.
+ *
+ * stored:
+ *    32 bits length in bytes.
+ *
+ * fixed:
+ *    magic fixed tree.
+ *    symbols.
+ *
+ * dynamic:
+ *    dynamic tree encoding.
+ *    symbols.
+ *
+ *
+ * The buffer for decompression in place is the length of the
+ * uncompressed data, plus a small amount extra to keep the algorithm safe.
+ * The compressed data is placed at the end of the buffer.  The output
+ * pointer is placed at the start of the buffer and the input pointer
+ * is placed where the compressed data starts.  Problems will occur
+ * when the output pointer overruns the input pointer.
+ *
+ * The output pointer can only overrun the input pointer if the input
+ * pointer is moving faster than the output pointer.  A condition only
+ * triggered by data whose compressed form is larger than the uncompressed
+ * form.
+ *
+ * The worst case at the block level is a growth of the compressed data
+ * of 5 bytes per 32767 bytes.
+ *
+ * The worst case internal to a compressed block is very hard to figure.
+ * The worst case can at least be boundined by having one bit that represents
+ * 32764 bytes and then all of the rest of the bytes representing the very
+ * very last byte.
+ *
+ * All of which is enough to compute an amount of extra data that is required
+ * to be safe.  To avoid problems at the block level allocating 5 extra bytes
+ * per 32767 bytes of data is sufficient.  To avoind problems internal to a block
+ * adding an extra 32767 bytes (the worst case uncompressed block size) is
+ * sufficient, to ensure that in the worst case the decompressed data for
+ * block will stop the byte before the compressed data for a block begins.
+ * To avoid problems with the compressed data's meta information an extra 18
+ * bytes are needed.  Leading to the formula:
+ *
+ * extra_bytes = (uncompressed_size >> 12) + 32768 + 18 + decompressor_size.
+ *
+ * Adding 8 bytes per 32K is a bit excessive but much easier to calculate.
+ * Adding 32768 instead of 32767 just makes for round numbers.
+ * Adding the decompressor_size is necessary as it musht live after all
+ * of the data as well.  Last I measured the decompressor is about 14K.
+ * 10K of actuall data and 4K of bss.
+ *
+ */
+
+/*
+ * gzip declarations
+ */
+
+#define OF(args)  args
+#define STATIC static
+
+#undef memset
+#undef memcpy
+#define memzero(s, n)     memset ((s), 0, (n))
+
+typedef unsigned char  uch;
+typedef unsigned short ush;
+typedef unsigned long  ulg;
+
+#define WSIZE 0x80000000        /* Window size must be at least 32k,
+                                 * and a power of two
+                                 * We don't actually have a window just
+                                 * a huge output buffer so I report
+                                 * a 2G windows size, as that should
+                                 * always be larger than our output buffer.
+                                 */
+
+static uch *inbuf;      /* input buffer */
+static uch *window;     /* Sliding window buffer, (and final output buffer) */
+
+static unsigned insize;  /* valid bytes in inbuf */
+static unsigned inptr;   /* index of next byte to be processed in inbuf */
+static unsigned outcnt;  /* bytes in output buffer */
+
+/* gzip flag byte */
+#define ASCII_FLAG   0x01 /* bit 0 set: file probably ASCII text */
+#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
+#define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
+#define ORIG_NAME    0x08 /* bit 3 set: original file name present */
+#define COMMENT      0x10 /* bit 4 set: file comment present */
+#define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
+#define RESERVED     0xC0 /* bit 6,7:   reserved */
+
+#define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())
+                
+/* Diagnostic functions */
+#ifdef DEBUG
+#  define Assert(cond,msg) {if(!(cond)) error(msg);}
+#  define Trace(x) fprintf x
+#  define Tracev(x) {if (verbose) fprintf x ;}
+#  define Tracevv(x) {if (verbose>1) fprintf x ;}
+#  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
+#  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
+#else
+#  define Assert(cond,msg)
+#  define Trace(x)
+#  define Tracev(x)
+#  define Tracevv(x)
+#  define Tracec(c,x)
+#  define Tracecv(c,x)
+#endif
+
+static int  fill_inbuf(void);
+static void flush_window(void);
+static void error(char *m);
+static void gzip_mark(void **);
+static void gzip_release(void **);
+  
+/*
+ * This is set up by the setup-routine at boot-time
+ */
+static unsigned char *real_mode; /* Pointer to real-mode data */
+
+#define RM_EXT_MEM_K   (*(unsigned short *)(real_mode + 0x2))
+#ifndef STANDARD_MEMORY_BIOS_CALL
+#define RM_ALT_MEM_K   (*(unsigned long *)(real_mode + 0x1e0))
+#endif
+#define RM_SCREEN_INFO (*(struct screen_info *)(real_mode+0))
+
+extern unsigned char input_data[];
+extern int input_len;
+
+static long bytes_out = 0;
+
+static void *malloc(int size);
+static void free(void *where);
+
+static void *memset(void *s, int c, unsigned n);
+static void *memcpy(void *dest, const void *src, unsigned n);
+
+static void putstr(const char *);
+
+static unsigned long free_mem_ptr;
+static unsigned long free_mem_end_ptr;
+
+#define HEAP_SIZE             0x4000
+
+static char *vidmem = (char *)0xb8000;
+static int vidport;
+static int lines, cols;
+
+#ifdef CONFIG_X86_NUMAQ
+void *xquad_portio;
+#endif
+
+#include "../../../../lib/inflate.c"
+
+static void *malloc(int size)
+{
+        void *p;
+
+        if (size <0) error("Malloc error");
+        if (free_mem_ptr <= 0) error("Memory error");
+
+        free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
+
+        p = (void *)free_mem_ptr;
+        free_mem_ptr += size;
+
+        if (free_mem_ptr >= free_mem_end_ptr)
+                error("Out of memory");
+
+        return p;
+}
+
+static void free(void *where)
+{       /* Don't care */
+}
+
+static void gzip_mark(void **ptr)
+{
+        *ptr = (void *) free_mem_ptr;
+}
+
+static void gzip_release(void **ptr)
+{
+        free_mem_ptr = (unsigned long) *ptr;
+}
+ 
+static void scroll(void)
+{
+        int i;
+
+        memcpy ( vidmem, vidmem + cols * 2, ( lines - 1 ) * cols * 2 );
+        for ( i = ( lines - 1 ) * cols * 2; i < lines * cols * 2; i += 2 )
+                vidmem[i] = ' ';
+}
+
+static void putstr(const char *s)
+{
+        int x,y,pos;
+        char c;
+
+        x = RM_SCREEN_INFO.orig_x;
+        y = RM_SCREEN_INFO.orig_y;
+
+        while ( ( c = *s++ ) != '\0' ) {
+                if ( c == '\n' ) {
+                        x = 0;
+                        if ( ++y >= lines ) {
+                                scroll();
+                                y--;
+                        }
+                } else {
+                        vidmem [ ( x + cols * y ) * 2 ] = c;
+                        if ( ++x >= cols ) {
+                                x = 0;
+                                if ( ++y >= lines ) {
+                                        scroll();
+                                        y--;
+                                }
+                        }
+                }
+        }
+
+        RM_SCREEN_INFO.orig_x = x;
+        RM_SCREEN_INFO.orig_y = y;
+
+        pos = (x + cols * y) * 2;       /* Update cursor position */
+        outb_p(14, vidport);
+        outb_p(0xff & (pos >> 9), vidport+1);
+        outb_p(15, vidport);
+        outb_p(0xff & (pos >> 1), vidport+1);
+}
+
+static void* memset(void* s, int c, unsigned n)
+{
+        int i;
+        char *ss = (char*)s;
+
+        for (i=0;i<n;i++) ss[i] = c;
+        return s;
+}
+
+static void* memcpy(void* dest, const void* src, unsigned n)
+{
+        int i;
+        char *d = (char *)dest, *s = (char *)src;
+
+        for (i=0;i<n;i++) d[i] = s[i];
+        return dest;
+}
+
+/* ===========================================================================
+ * Fill the input buffer. This is called only when the buffer is empty
+ * and at least one byte is really needed.
+ */
+static int fill_inbuf(void)
+{
+        error("ran out of input data");
+        return 0;
+}
+
+/* ===========================================================================
+ * Write the output window window[0..outcnt-1] and update crc and bytes_out.
+ * (Used for the decompressed data only.)
+ */
+static void flush_window(void)
+{
+        /* With my window equal to my output buffer
+         * I only need to compute the crc here.
+         */
+        ulg c = crc;         /* temporary variable */
+        unsigned n;
+        uch *in, ch;
+
+        in = window;
+        for (n = 0; n < outcnt; n++) {
+                ch = *in++;
+                c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
+        }
+        crc = c;
+        bytes_out += (ulg)outcnt;
+        outcnt = 0;
+}
+
+static void error(char *x)
+{
+        putstr("\n\n");
+        putstr(x);
+        putstr("\n\n -- System halted");
+
+        while(1);       /* Halt */
+}
+
+asmlinkage void decompress_kernel(void *rmode, unsigned long end,
+                        uch *input_data, unsigned long input_len, uch *output)
+{
+        real_mode = rmode;
+
+        if (RM_SCREEN_INFO.orig_video_mode == 7) {
+                vidmem = (char *) 0xb0000;
+                vidport = 0x3b4;
+        } else {
+                vidmem = (char *) 0xb8000;
+                vidport = 0x3d4;
+        }
+
+        lines = RM_SCREEN_INFO.orig_video_lines;
+        cols = RM_SCREEN_INFO.orig_video_cols;
+
+        window = output;        /* Output buffer (Normally at 1M) */
+        free_mem_ptr     = end; /* Heap  */
+        free_mem_end_ptr = end + HEAP_SIZE;
+        inbuf  = input_data;    /* Input buffer */
+        insize = input_len;
+        inptr  = 0;
+
+        if ((u32)output & (CONFIG_PHYSICAL_ALIGN -1))
+                error("Destination address not CONFIG_PHYSICAL_ALIGN aligned");
+        if (end > ((-__PAGE_OFFSET-(512 <<20)-1) & 0x7fffffff))
+                error("Destination address too large");
+#ifndef CONFIG_RELOCATABLE
+        if ((u32)output != LOAD_PHYSICAL_ADDR)
+                error("Wrong destination address");
+#endif
+
+        makecrc();
+        putstr("Uncompressing Linux... ");
+        gunzip();
+        putstr("Ok, booting the kernel.\n");
+        return;
+}
diff --git a/arch/x86/boot/compressed/relocs.c b/arch/x86/boot/compressed/relocs.c
new file mode 100644
index 000000000000..2d77ee728f92
--- /dev/null
+++ b/arch/x86/boot/compressed/relocs.c
@@ -0,0 +1,631 @@
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <elf.h>
+#include <byteswap.h>
+#define USE_BSD
+#include <endian.h>
+
+#define MAX_SHDRS 100
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+static Elf32_Ehdr ehdr;
+static Elf32_Shdr shdr[MAX_SHDRS];
+static Elf32_Sym  *symtab[MAX_SHDRS];
+static Elf32_Rel  *reltab[MAX_SHDRS];
+static char *strtab[MAX_SHDRS];
+static unsigned long reloc_count, reloc_idx;
+static unsigned long *relocs;
+
+/*
+ * Following symbols have been audited. There values are constant and do
+ * not change if bzImage is loaded at a different physical address than
+ * the address for which it has been compiled. Don't warn user about
+ * absolute relocations present w.r.t these symbols.
+ */
+static const char* safe_abs_relocs[] = {
+                "__kernel_vsyscall",
+                "__kernel_rt_sigreturn",
+                "__kernel_sigreturn",
+                "SYSENTER_RETURN",
+                "VDSO_NOTE_MASK",
+                "xen_irq_disable_direct_reloc",
+                "xen_save_fl_direct_reloc",
+};
+
+static int is_safe_abs_reloc(const char* sym_name)
+{
+        int i, array_size;
+
+        array_size = sizeof(safe_abs_relocs)/sizeof(char*);
+
+        for(i = 0; i < array_size; i++) {
+                if (!strcmp(sym_name, safe_abs_relocs[i]))
+                        /* Match found */
+                        return 1;
+        }
+        if (strncmp(sym_name, "__crc_", 6) == 0)
+                return 1;
+        return 0;
+}
+
+static void die(char *fmt, ...)
+{
+        va_list ap;
+        va_start(ap, fmt);
+        vfprintf(stderr, fmt, ap);
+        va_end(ap);
+        exit(1);
+}
+
+static const char *sym_type(unsigned type)
+{
+        static const char *type_name[] = {
+#define SYM_TYPE(X) [X] = #X
+                SYM_TYPE(STT_NOTYPE),
+                SYM_TYPE(STT_OBJECT),
+                SYM_TYPE(STT_FUNC),
+                SYM_TYPE(STT_SECTION),
+                SYM_TYPE(STT_FILE),
+                SYM_TYPE(STT_COMMON),
+                SYM_TYPE(STT_TLS),
+#undef SYM_TYPE
+        };
+        const char *name = "unknown sym type name";
+        if (type < ARRAY_SIZE(type_name)) {
+                name = type_name[type];
+        }
+        return name;
+}
+
+static const char *sym_bind(unsigned bind)
+{
+        static const char *bind_name[] = {
+#define SYM_BIND(X) [X] = #X
+                SYM_BIND(STB_LOCAL),
+                SYM_BIND(STB_GLOBAL),
+                SYM_BIND(STB_WEAK),
+#undef SYM_BIND
+        };
+        const char *name = "unknown sym bind name";
+        if (bind < ARRAY_SIZE(bind_name)) {
+                name = bind_name[bind];
+        }
+        return name;
+}
+
+static const char *sym_visibility(unsigned visibility)
+{
+        static const char *visibility_name[] = {
+#define SYM_VISIBILITY(X) [X] = #X
+                SYM_VISIBILITY(STV_DEFAULT),
+                SYM_VISIBILITY(STV_INTERNAL),
+                SYM_VISIBILITY(STV_HIDDEN),
+                SYM_VISIBILITY(STV_PROTECTED),
+#undef SYM_VISIBILITY
+        };
+        const char *name = "unknown sym visibility name";
+        if (visibility < ARRAY_SIZE(visibility_name)) {
+                name = visibility_name[visibility];
+        }
+        return name;
+}
+
+static const char *rel_type(unsigned type)
+{
+        static const char *type_name[] = {
+#define REL_TYPE(X) [X] = #X
+                REL_TYPE(R_386_NONE),
+                REL_TYPE(R_386_32),
+                REL_TYPE(R_386_PC32),
+                REL_TYPE(R_386_GOT32),
+                REL_TYPE(R_386_PLT32),
+                REL_TYPE(R_386_COPY),
+                REL_TYPE(R_386_GLOB_DAT),
+                REL_TYPE(R_386_JMP_SLOT),
+                REL_TYPE(R_386_RELATIVE),
+                REL_TYPE(R_386_GOTOFF),
+                REL_TYPE(R_386_GOTPC),
+#undef REL_TYPE
+        };
+        const char *name = "unknown type rel type name";
+        if (type < ARRAY_SIZE(type_name)) {
+                name = type_name[type];
+        }
+        return name;
+}
+
+static const char *sec_name(unsigned shndx)
+{
+        const char *sec_strtab;
+        const char *name;
+        sec_strtab = strtab[ehdr.e_shstrndx];
+        name = "<noname>";
+        if (shndx < ehdr.e_shnum) {
+                name = sec_strtab + shdr[shndx].sh_name;
+        }
+        else if (shndx == SHN_ABS) {
+                name = "ABSOLUTE";
+        }
+        else if (shndx == SHN_COMMON) {
+                name = "COMMON";
+        }
+        return name;
+}
+
+static const char *sym_name(const char *sym_strtab, Elf32_Sym *sym)
+{
+        const char *name;
+        name = "<noname>";
+        if (sym->st_name) {
+                name = sym_strtab + sym->st_name;
+        }
+        else {
+                name = sec_name(shdr[sym->st_shndx].sh_name);
+        }
+        return name;
+}
+
+
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+#define le16_to_cpu(val) (val)
+#define le32_to_cpu(val) (val)
+#endif
+#if BYTE_ORDER == BIG_ENDIAN
+#define le16_to_cpu(val) bswap_16(val)
+#define le32_to_cpu(val) bswap_32(val)
+#endif
+
+static uint16_t elf16_to_cpu(uint16_t val)
+{
+        return le16_to_cpu(val);
+}
+
+static uint32_t elf32_to_cpu(uint32_t val)
+{
+        return le32_to_cpu(val);
+}
+
+static void read_ehdr(FILE *fp)
+{
+        if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1) {
+                die("Cannot read ELF header: %s\n",
+                        strerror(errno));
+        }
+        if (memcmp(ehdr.e_ident, ELFMAG, 4) != 0) {
+                die("No ELF magic\n");
+        }
+        if (ehdr.e_ident[EI_CLASS] != ELFCLASS32) {
+                die("Not a 32 bit executable\n");
+        }
+        if (ehdr.e_ident[EI_DATA] != ELFDATA2LSB) {
+                die("Not a LSB ELF executable\n");
+        }
+        if (ehdr.e_ident[EI_VERSION] != EV_CURRENT) {
+                die("Unknown ELF version\n");
+        }
+        /* Convert the fields to native endian */
+        ehdr.e_type      = elf16_to_cpu(ehdr.e_type);
+        ehdr.e_machine   = elf16_to_cpu(ehdr.e_machine);
+        ehdr.e_version   = elf32_to_cpu(ehdr.e_version);
+        ehdr.e_entry     = elf32_to_cpu(ehdr.e_entry);
+        ehdr.e_phoff     = elf32_to_cpu(ehdr.e_phoff);
+        ehdr.e_shoff     = elf32_to_cpu(ehdr.e_shoff);
+        ehdr.e_flags     = elf32_to_cpu(ehdr.e_flags);
+        ehdr.e_ehsize    = elf16_to_cpu(ehdr.e_ehsize);
+        ehdr.e_phentsize = elf16_to_cpu(ehdr.e_phentsize);
+        ehdr.e_phnum     = elf16_to_cpu(ehdr.e_phnum);
+        ehdr.e_shentsize = elf16_to_cpu(ehdr.e_shentsize);
+        ehdr.e_shnum     = elf16_to_cpu(ehdr.e_shnum);
+        ehdr.e_shstrndx  = elf16_to_cpu(ehdr.e_shstrndx);
+
+        if ((ehdr.e_type != ET_EXEC) && (ehdr.e_type != ET_DYN)) {
+                die("Unsupported ELF header type\n");
+        }
+        if (ehdr.e_machine != EM_386) {
+                die("Not for x86\n");
+        }
+        if (ehdr.e_version != EV_CURRENT) {
+                die("Unknown ELF version\n");
+        }
+        if (ehdr.e_ehsize != sizeof(Elf32_Ehdr)) {
+                die("Bad Elf header size\n");
+        }
+        if (ehdr.e_phentsize != sizeof(Elf32_Phdr)) {
+                die("Bad program header entry\n");
+        }
+        if (ehdr.e_shentsize != sizeof(Elf32_Shdr)) {
+                die("Bad section header entry\n");
+        }
+        if (ehdr.e_shstrndx >= ehdr.e_shnum) {
+                die("String table index out of bounds\n");
+        }
+}
+
+static void read_shdrs(FILE *fp)
+{
+        int i;
+        if (ehdr.e_shnum > MAX_SHDRS) {
+                die("%d section headers supported: %d\n",
+                        ehdr.e_shnum, MAX_SHDRS);
+        }
+        if (fseek(fp, ehdr.e_shoff, SEEK_SET) < 0) {
+                die("Seek to %d failed: %s\n",
+                        ehdr.e_shoff, strerror(errno));
+        }
+        if (fread(&shdr, sizeof(shdr[0]), ehdr.e_shnum, fp) != ehdr.e_shnum) {
+                die("Cannot read ELF section headers: %s\n",
+                        strerror(errno));
+        }
+        for(i = 0; i < ehdr.e_shnum; i++) {
+                shdr[i].sh_name      = elf32_to_cpu(shdr[i].sh_name);
+                shdr[i].sh_type      = elf32_to_cpu(shdr[i].sh_type);
+                shdr[i].sh_flags     = elf32_to_cpu(shdr[i].sh_flags);
+                shdr[i].sh_addr      = elf32_to_cpu(shdr[i].sh_addr);
+                shdr[i].sh_offset    = elf32_to_cpu(shdr[i].sh_offset);
+                shdr[i].sh_size      = elf32_to_cpu(shdr[i].sh_size);
+                shdr[i].sh_link      = elf32_to_cpu(shdr[i].sh_link);
+                shdr[i].sh_info      = elf32_to_cpu(shdr[i].sh_info);
+                shdr[i].sh_addralign = elf32_to_cpu(shdr[i].sh_addralign);
+                shdr[i].sh_entsize   = elf32_to_cpu(shdr[i].sh_entsize);
+        }
+
+}
+
+static void read_strtabs(FILE *fp)
+{
+        int i;
+        for(i = 0; i < ehdr.e_shnum; i++) {
+                if (shdr[i].sh_type != SHT_STRTAB) {
+                        continue;
+                }
+                strtab[i] = malloc(shdr[i].sh_size);
+                if (!strtab[i]) {
+                        die("malloc of %d bytes for strtab failed\n",
+                                shdr[i].sh_size);
+                }
+                if (fseek(fp, shdr[i].sh_offset, SEEK_SET) < 0) {
+                        die("Seek to %d failed: %s\n",
+                                shdr[i].sh_offset, strerror(errno));
+                }
+                if (fread(strtab[i], 1, shdr[i].sh_size, fp) != shdr[i].sh_size) {
+                        die("Cannot read symbol table: %s\n",
+                                strerror(errno));
+                }
+        }
+}
+
+static void read_symtabs(FILE *fp)
+{
+        int i,j;
+        for(i = 0; i < ehdr.e_shnum; i++) {
+                if (shdr[i].sh_type != SHT_SYMTAB) {
+                        continue;
+                }
+                symtab[i] = malloc(shdr[i].sh_size);
+                if (!symtab[i]) {
+                        die("malloc of %d bytes for symtab failed\n",
+                                shdr[i].sh_size);
+                }
+                if (fseek(fp, shdr[i].sh_offset, SEEK_SET) < 0) {
+                        die("Seek to %d failed: %s\n",
+                                shdr[i].sh_offset, strerror(errno));
+                }
+                if (fread(symtab[i], 1, shdr[i].sh_size, fp) != shdr[i].sh_size) {
+                        die("Cannot read symbol table: %s\n",
+                                strerror(errno));
+                }
+                for(j = 0; j < shdr[i].sh_size/sizeof(symtab[i][0]); j++) {
+                        symtab[i][j].st_name  = elf32_to_cpu(symtab[i][j].st_name);
+                        symtab[i][j].st_value = elf32_to_cpu(symtab[i][j].st_value);
+                        symtab[i][j].st_size  = elf32_to_cpu(symtab[i][j].st_size);
+                        symtab[i][j].st_shndx = elf16_to_cpu(symtab[i][j].st_shndx);
+                }
+        }
+}
+
+
+static void read_relocs(FILE *fp)
+{
+        int i,j;
+        for(i = 0; i < ehdr.e_shnum; i++) {
+                if (shdr[i].sh_type != SHT_REL) {
+                        continue;
+                }
+                reltab[i] = malloc(shdr[i].sh_size);
+                if (!reltab[i]) {
+                        die("malloc of %d bytes for relocs failed\n",
+                                shdr[i].sh_size);
+                }
+                if (fseek(fp, shdr[i].sh_offset, SEEK_SET) < 0) {
+                        die("Seek to %d failed: %s\n",
+                                shdr[i].sh_offset, strerror(errno));
+                }
+                if (fread(reltab[i], 1, shdr[i].sh_size, fp) != shdr[i].sh_size) {
+                        die("Cannot read symbol table: %s\n",
+                                strerror(errno));
+                }
+                for(j = 0; j < shdr[i].sh_size/sizeof(reltab[0][0]); j++) {
+                        reltab[i][j].r_offset = elf32_to_cpu(reltab[i][j].r_offset);
+                        reltab[i][j].r_info   = elf32_to_cpu(reltab[i][j].r_info);
+                }
+        }
+}
+
+
+static void print_absolute_symbols(void)
+{
+        int i;
+        printf("Absolute symbols\n");
+        printf(" Num:    Value Size  Type       Bind        Visibility  Name\n");
+        for(i = 0; i < ehdr.e_shnum; i++) {
+                char *sym_strtab;
+                Elf32_Sym *sh_symtab;
+                int j;
+                if (shdr[i].sh_type != SHT_SYMTAB) {
+                        continue;
+                }
+                sh_symtab = symtab[i];
+                sym_strtab = strtab[shdr[i].sh_link];
+                for(j = 0; j < shdr[i].sh_size/sizeof(symtab[0][0]); j++) {
+                        Elf32_Sym *sym;
+                        const char *name;
+                        sym = &symtab[i][j];
+                        name = sym_name(sym_strtab, sym);
+                        if (sym->st_shndx != SHN_ABS) {
+                                continue;
+                        }
+                        printf("%5d %08x %5d %10s %10s %12s %s\n",
+                                j, sym->st_value, sym->st_size,
+                                sym_type(ELF32_ST_TYPE(sym->st_info)),
+                                sym_bind(ELF32_ST_BIND(sym->st_info)),
+                                sym_visibility(ELF32_ST_VISIBILITY(sym->st_other)),
+                                name);
+                }
+        }
+        printf("\n");
+}
+
+static void print_absolute_relocs(void)
+{
+        int i, printed = 0;
+
+        for(i = 0; i < ehdr.e_shnum; i++) {
+                char *sym_strtab;
+                Elf32_Sym *sh_symtab;
+                unsigned sec_applies, sec_symtab;
+                int j;
+                if (shdr[i].sh_type != SHT_REL) {
+                        continue;
+                }
+                sec_symtab  = shdr[i].sh_link;
+                sec_applies = shdr[i].sh_info;
+                if (!(shdr[sec_applies].sh_flags & SHF_ALLOC)) {
+                        continue;
+                }
+                sh_symtab = symtab[sec_symtab];
+                sym_strtab = strtab[shdr[sec_symtab].sh_link];
+                for(j = 0; j < shdr[i].sh_size/sizeof(reltab[0][0]); j++) {
+                        Elf32_Rel *rel;
+                        Elf32_Sym *sym;
+                        const char *name;
+                        rel = &reltab[i][j];
+                        sym = &sh_symtab[ELF32_R_SYM(rel->r_info)];
+                        name = sym_name(sym_strtab, sym);
+                        if (sym->st_shndx != SHN_ABS) {
+                                continue;
+                        }
+
+                        /* Absolute symbols are not relocated if bzImage is
+                         * loaded at a non-compiled address. Display a warning
+                         * to user at compile time about the absolute
+                         * relocations present.
+                         *
+                         * User need to audit the code to make sure
+                         * some symbols which should have been section
+                         * relative have not become absolute because of some
+                         * linker optimization or wrong programming usage.
+                         *
+                         * Before warning check if this absolute symbol
+                         * relocation is harmless.
+                         */
+                        if (is_safe_abs_reloc(name))
+                                continue;
+
+                        if (!printed) {
+                                printf("WARNING: Absolute relocations"
+                                        " present\n");
+                                printf("Offset     Info     Type     Sym.Value "
+                                        "Sym.Name\n");
+                                printed = 1;
+                        }
+
+                        printf("%08x %08x %10s %08x  %s\n",
+                                rel->r_offset,
+                                rel->r_info,
+                                rel_type(ELF32_R_TYPE(rel->r_info)),
+                                sym->st_value,
+                                name);
+                }
+        }
+
+        if (printed)
+                printf("\n");
+}
+
+static void walk_relocs(void (*visit)(Elf32_Rel *rel, Elf32_Sym *sym))
+{
+        int i;
+        /* Walk through the relocations */
+        for(i = 0; i < ehdr.e_shnum; i++) {
+                char *sym_strtab;
+                Elf32_Sym *sh_symtab;
+                unsigned sec_applies, sec_symtab;
+                int j;
+                if (shdr[i].sh_type != SHT_REL) {
+                        continue;
+                }
+                sec_symtab  = shdr[i].sh_link;
+                sec_applies = shdr[i].sh_info;
+                if (!(shdr[sec_applies].sh_flags & SHF_ALLOC)) {
+                        continue;
+                }
+                sh_symtab = symtab[sec_symtab];
+                sym_strtab = strtab[shdr[sec_symtab].sh_link];
+                for(j = 0; j < shdr[i].sh_size/sizeof(reltab[0][0]); j++) {
+                        Elf32_Rel *rel;
+                        Elf32_Sym *sym;
+                        unsigned r_type;
+                        rel = &reltab[i][j];
+                        sym = &sh_symtab[ELF32_R_SYM(rel->r_info)];
+                        r_type = ELF32_R_TYPE(rel->r_info);
+                        /* Don't visit relocations to absolute symbols */
+                        if (sym->st_shndx == SHN_ABS) {
+                                continue;
+                        }
+                        if (r_type == R_386_PC32) {
+                                /* PC relative relocations don't need to be adjusted */
+                        }
+                        else if (r_type == R_386_32) {
+                                /* Visit relocations that need to be adjusted */
+                                visit(rel, sym);
+                        }
+                        else {
+                                die("Unsupported relocation type: %d\n", r_type);
+                        }
+                }
+        }
+}
+
+static void count_reloc(Elf32_Rel *rel, Elf32_Sym *sym)
+{
+        reloc_count += 1;
+}
+
+static void collect_reloc(Elf32_Rel *rel, Elf32_Sym *sym)
+{
+        /* Remember the address that needs to be adjusted. */
+        relocs[reloc_idx++] = rel->r_offset;
+}
+
+static int cmp_relocs(const void *va, const void *vb)
+{
+        const unsigned long *a, *b;
+        a = va; b = vb;
+        return (*a == *b)? 0 : (*a > *b)? 1 : -1;
+}
+
+static void emit_relocs(int as_text)
+{
+        int i;
+        /* Count how many relocations I have and allocate space for them. */
+        reloc_count = 0;
+        walk_relocs(count_reloc);
+        relocs = malloc(reloc_count * sizeof(relocs[0]));
+        if (!relocs) {
+                die("malloc of %d entries for relocs failed\n",
+                        reloc_count);
+        }
+        /* Collect up the relocations */
+        reloc_idx = 0;
+        walk_relocs(collect_reloc);
+
+        /* Order the relocations for more efficient processing */
+        qsort(relocs, reloc_count, sizeof(relocs[0]), cmp_relocs);
+
+        /* Print the relocations */
+        if (as_text) {
+                /* Print the relocations in a form suitable that
+                 * gas will like.
+                 */
+                printf(".section \".data.reloc\",\"a\"\n");
+                printf(".balign 4\n");
+                for(i = 0; i < reloc_count; i++) {
+                        printf("\t .long 0x%08lx\n", relocs[i]);
+                }
+                printf("\n");
+        }
+        else {
+                unsigned char buf[4];
+                buf[0] = buf[1] = buf[2] = buf[3] = 0;
+                /* Print a stop */
+                printf("%c%c%c%c", buf[0], buf[1], buf[2], buf[3]);
+                /* Now print each relocation */
+                for(i = 0; i < reloc_count; i++) {
+                        buf[0] = (relocs[i] >>  0) & 0xff;
+                        buf[1] = (relocs[i] >>  8) & 0xff;
+                        buf[2] = (relocs[i] >> 16) & 0xff;
+                        buf[3] = (relocs[i] >> 24) & 0xff;
+                        printf("%c%c%c%c", buf[0], buf[1], buf[2], buf[3]);
+                }
+        }
+}
+
+static void usage(void)
+{
+        die("relocs [--abs-syms |--abs-relocs | --text] vmlinux\n");
+}
+
+int main(int argc, char **argv)
+{
+        int show_absolute_syms, show_absolute_relocs;
+        int as_text;
+        const char *fname;
+        FILE *fp;
+        int i;
+
+        show_absolute_syms = 0;
+        show_absolute_relocs = 0;
+        as_text = 0;
+        fname = NULL;
+        for(i = 1; i < argc; i++) {
+                char *arg = argv[i];
+                if (*arg == '-') {
+                        if (strcmp(argv[1], "--abs-syms") == 0) {
+                                show_absolute_syms = 1;
+                                continue;
+                        }
+
+                        if (strcmp(argv[1], "--abs-relocs") == 0) {
+                                show_absolute_relocs = 1;
+                                continue;
+                        }
+                        else if (strcmp(argv[1], "--text") == 0) {
+                                as_text = 1;
+                                continue;
+                        }
+                }
+                else if (!fname) {
+                        fname = arg;
+                        continue;
+                }
+                usage();
+        }
+        if (!fname) {
+                usage();
+        }
+        fp = fopen(fname, "r");
+        if (!fp) {
+                die("Cannot open %s: %s\n",
+                        fname, strerror(errno));
+        }
+        read_ehdr(fp);
+        read_shdrs(fp);
+        read_strtabs(fp);
+        read_symtabs(fp);
+        read_relocs(fp);
+        if (show_absolute_syms) {
+                print_absolute_symbols();
+                return 0;
+        }
+        if (show_absolute_relocs) {
+                print_absolute_relocs();
+                return 0;
+        }
+        emit_relocs(as_text);
+        return 0;
+}
diff --git a/arch/x86/boot/compressed/vmlinux_32.lds b/arch/x86/boot/compressed/vmlinux_32.lds
new file mode 100644
index 000000000000..cc4854f6c6c1
--- /dev/null
+++ b/arch/x86/boot/compressed/vmlinux_32.lds
@@ -0,0 +1,43 @@
+OUTPUT_FORMAT("elf32-i386", "elf32-i386", "elf32-i386")
+OUTPUT_ARCH(i386)
+ENTRY(startup_32)
+SECTIONS
+{
+        /* Be careful parts of head.S assume startup_32 is at
+         * address 0.
+         */
+        . =  0  ;
+        .text.head : {
+                _head = . ;
+                *(.text.head)
+                _ehead = . ;
+        }
+        .data.compressed : {
+                *(.data.compressed)
+        }
+        .text : {
+                _text = .;      /* Text */
+                *(.text)
+                *(.text.*)
+                _etext = . ;
+        }
+        .rodata : {
+                _rodata = . ;
+                *(.rodata)       /* read-only data */
+                *(.rodata.*)
+                _erodata = . ;
+        }
+        .data : {
+                _data = . ;
+                *(.data)
+                *(.data.*)
+                _edata = . ;
+        }
+        .bss : {
+                _bss = . ;
+                *(.bss)
+                *(.bss.*)
+                *(COMMON)
+                _end = . ;
+        }
+}
diff --git a/arch/x86/boot/compressed/vmlinux_32.scr b/arch/x86/boot/compressed/vmlinux_32.scr
new file mode 100644
index 000000000000..707a88f7f29e
--- /dev/null
+++ b/arch/x86/boot/compressed/vmlinux_32.scr
@@ -0,0 +1,10 @@
+SECTIONS
+{
+  .data.compressed : {
+        input_len = .;
+        LONG(input_data_end - input_data) input_data = .; 
+        *(.data) 
+        output_len = . - 4;
+        input_data_end = .; 
+        }
+}