MIPS: Add support for GZIP / BZIP2 / LZMA compressed kernel images

This patch helps to generate smaller kernel images for linux-MIPS, Here is the effect when using lzma: $ ls -sh vmlinux 7.1M vmlinux $ ls -sh vmlinuz 1.5M vmlinuz Have tested the 32bit kernel on Qemu/Malta and 64bit kernel on FuLoong Mini PC. both of them work well. and also, tested by Alexander Clouter on an AR7 based Linksys WAG54Gv2, and by Manuel Lauss on an Alchemy board. This -v2 version incorporate the feedback from Ralf, and add the following changes: 1. add .ecoff, .bin, .erec format support 2. only enable it and the debug source code for the machines we tested 3. a dozen of fixups and cleanups and if you want to enable it for your board, please try to select SYS_SUPPORTS_ZBOOT for it, and if the board have an 16550 compatible uart, you can select SYS_SUPPORTS_ZBOOT_UART16550 directly. and then sending the relative patches to Ralf. Tested-by: Manuel Lauss <manuel.lauss@googlemail.com> Tested-by: Alexander Clouter <alex@digriz.org.uk> Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

MIPS: Add support for GZIP / BZIP2 / LZMA compressed kernel images
This patch helps to generate smaller kernel images for linux-MIPS, Here is the effect when using lzma: $ ls -sh vmlinux 7.1M vmlinux $ ls -sh vmlinuz 1.5M vmlinuz Have tested the 32bit kernel on Qemu/Malta and 64bit kernel on FuLoong Mini PC. both of them work well. and also, tested by Alexander Clouter on an AR7 based Linksys WAG54Gv2, and by Manuel Lauss on an Alchemy board. This -v2 version incorporate the feedback from Ralf, and add the following changes: 1. add .ecoff, .bin, .erec format support 2. only enable it and the debug source code for the machines we tested 3. a dozen of fixups and cleanups and if you want to enable it for your board, please try to select SYS_SUPPORTS_ZBOOT for it, and if the board have an 16550 compatible uart, you can select SYS_SUPPORTS_ZBOOT_UART16550 directly. and then sending the relative patches to Ralf. Tested-by: Manuel Lauss <manuel.lauss@googlemail.com> Tested-by: Alexander Clouter <alex@digriz.org.uk> Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Wu Zhangjin · Ralf Baechle
1 parent bea4c899f2
Showing 9 changed files with 558 additions and 3 deletions Side-by-side Diff
arch/mips/Kconfig
arch/mips/Makefile
arch/mips/boot/compressed/Makefile
arch/mips/boot/compressed/dbg.c
arch/mips/boot/compressed/decompress.c
arch/mips/boot/compressed/dummy.c
arch/mips/boot/compressed/head.S
arch/mips/boot/compressed/ld.script
arch/mips/boot/compressed/uart-16550.c
@@ -22,6 +22,7 @@
  
 config MACH_ALCHEMY
 	bool "Alchemy processor based machines"
+	select SYS_SUPPORTS_ZBOOT
  
 config AR7
 	bool "Texas Instruments AR7"
@@ -36,6 +37,7 @@
 	select SYS_HAS_EARLY_PRINTK
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_LITTLE_ENDIAN
+	select SYS_SUPPORTS_ZBOOT_UART16550
 	select GENERIC_GPIO
 	select GCD
 	select VLYNQ
@@ -192,6 +194,7 @@
  
 config MACH_LOONGSON
 	bool "Loongson family of machines"
+	select SYS_SUPPORTS_ZBOOT_UART16550
 	help
 	  This enables the support of Loongson family of machines.
  
@@ -233,6 +236,7 @@
 	select SYS_SUPPORTS_MIPS_CMP
 	select SYS_SUPPORTS_MULTITHREADING
 	select SYS_SUPPORTS_SMARTMIPS
+	select SYS_SUPPORTS_ZBOOT
 	help
 	  This enables support for the MIPS Technologies Malta evaluation
 	  board.
@@ -1293,6 +1297,16 @@
 	  Full details can be found at http://www.caviumnetworks.com.
  
 endchoice
+
+config SYS_SUPPORTS_ZBOOT
+	bool
+	select HAVE_KERNEL_GZIP
+	select HAVE_KERNEL_BZIP2
+	select HAVE_KERNEL_LZMA
+
+config SYS_SUPPORTS_ZBOOT_UART16550
+	bool
+	select SYS_SUPPORTS_ZBOOT
  
 config CPU_LOONGSON2
 	bool
@@ -69,6 +69,7 @@
  
 all-$(CONFIG_BOOT_ELF32)	:= $(vmlinux-32)
 all-$(CONFIG_BOOT_ELF64)	:= $(vmlinux-64)
+all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlinuz
  
 #
 # GCC uses -G 0 -mabicalls -fpic as default.  We don't want PIC in the kernel
@@ -331,7 +332,7 @@
 core-$(CONFIG_MIPS_MALTA)	+= arch/mips/mti-malta/
 cflags-$(CONFIG_MIPS_MALTA)	+= -I$(srctree)/arch/mips/include/asm/mach-malta
 load-$(CONFIG_MIPS_MALTA)	+= 0xffffffff80100000
-all-$(CONFIG_MIPS_MALTA)	:= vmlinux.bin
+all-$(CONFIG_MIPS_MALTA)	:= vmlinuz.bin
  
 #
 # MIPS SIM
@@ -581,7 +582,7 @@
 else
 load-$(CONFIG_SNI_RM)		+= 0xffffffff80030000
 endif
-all-$(CONFIG_SNI_RM)		:= vmlinux.ecoff
+all-$(CONFIG_SNI_RM)		:= vmlinuz.ecoff
  
 #
 # Common TXx9
  
@@ -699,9 +700,23 @@
 	$(OBJCOPY) -O $(64bit-bfd) $(OBJCOPYFLAGS) $< $@
  
 makeboot =$(Q)$(MAKE) $(build)=arch/mips/boot VMLINUX=$(vmlinux-32) $(1)
+makezboot =$(Q)$(MAKE) $(build)=arch/mips/boot/compressed \
+	   VMLINUX_LOAD_ADDRESS=$(load-y) 32bit-bfd=$(32bit-bfd) $(1)
  
 all:	$(all-y)
  
+vmlinuz: vmlinux FORCE
+	+@$(call makezboot,$@)
+
+vmlinuz.bin: vmlinux
+	+@$(call makezboot,$@)
+
+vmlinuz.ecoff: vmlinux
+	+@$(call makezboot,$@)
+
+vmlinuz.srec: vmlinux
+	+@$(call makezboot,$@)
+
 vmlinux.bin: $(vmlinux-32)
 	+@$(call makeboot,$@)
  
  
@@ -726,11 +741,13 @@
  
 install:
 	$(Q)install -D -m 755 vmlinux $(INSTALL_PATH)/vmlinux-$(KERNELRELEASE)
+	$(Q)install -D -m 755 vmlinuz $(INSTALL_PATH)/vmlinuz-$(KERNELRELEASE)
 	$(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
 	$(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
  
 archclean:
 	@$(MAKE) $(clean)=arch/mips/boot
+	@$(MAKE) $(clean)=arch/mips/boot/compressed
 	@$(MAKE) $(clean)=arch/mips/lasat
  
 define archhelp
  
@@ -738,11 +755,19 @@
 	echo '  vmlinux.ecoff        - ECOFF boot image'
 	echo '  vmlinux.bin          - Raw binary boot image'
 	echo '  vmlinux.srec         - SREC boot image'
+	echo '  vmlinuz              - Compressed boot(zboot) image'
+	echo '  vmlinuz.ecoff        - ECOFF zboot image'
+	echo '  vmlinuz.bin          - Raw binary zboot image'
+	echo '  vmlinuz.srec         - SREC zboot image'
 	echo
 	echo '  These will be default as apropriate for a configured platform.'
 endef
  
 CLEAN_FILES += vmlinux.32 \
 	       vmlinux.64 \
-	       vmlinux.ecoff
+	       vmlinux.ecoff \
+	       vmlinuz \
+	       vmlinuz.ecoff \
+	       vmlinuz.bin \
+	       vmlinuz.srec
+#
+# This file is subject to the terms and conditions of the GNU General Public
+# License.
+#
+# Adapted for MIPS Pete Popov, Dan Malek
+#
+# Copyright (C) 1994 by Linus Torvalds
+# Adapted for PowerPC by Gary Thomas
+# modified by Cort (cort@cs.nmt.edu)
+#
+# Copyright (C) 2009 Lemote Inc. & DSLab, Lanzhou University
+# Author: Wu Zhangjin <wuzj@lemote.com>
+#
+
+# compressed kernel load addr: VMLINUZ_LOAD_ADDRESS > VMLINUX_LOAD_ADDRESS + VMLINUX_SIZE
+VMLINUX_SIZE := $(shell wc -c $(objtree)/$(KBUILD_IMAGE) 2>/dev/null | cut -d' ' -f1)
+VMLINUX_SIZE := $(shell [ -n "$(VMLINUX_SIZE)" ] && echo $$(($(VMLINUX_SIZE) + (65536 - $(VMLINUX_SIZE) % 65536))))
+VMLINUZ_LOAD_ADDRESS := 0x$(shell [ -n "$(VMLINUX_SIZE)" ] && printf %x $$(($(VMLINUX_LOAD_ADDRESS) + $(VMLINUX_SIZE))))
+
+# set the default size of the mallocing area for decompressing
+BOOT_HEAP_SIZE := 0x400000
+
+# Disable Function Tracer
+KBUILD_CFLAGS := $(shell echo $(KBUILD_CFLAGS) | sed -e "s/-pg//")
+
+KBUILD_CFLAGS := $(LINUXINCLUDE) $(KBUILD_CFLAGS) -D__KERNEL__ \
+	-DBOOT_HEAP_SIZE=$(BOOT_HEAP_SIZE) -D"VMLINUX_LOAD_ADDRESS_ULL=$(VMLINUX_LOAD_ADDRESS)ull" \
+
+KBUILD_AFLAGS := $(LINUXINCLUDE) $(KBUILD_AFLAGS) -D__ASSEMBLY__ \
+	-DKERNEL_ENTRY=0x$(shell $(NM) $(objtree)/$(KBUILD_IMAGE) 2>/dev/null | grep " kernel_entry" | cut -f1 -d \ ) \
+	-DBOOT_HEAP_SIZE=$(BOOT_HEAP_SIZE)
+
+obj-y := $(obj)/head.o $(obj)/decompress.o $(obj)/dbg.o
+
+obj-$(CONFIG_SYS_SUPPORTS_ZBOOT_UART16550) += $(obj)/uart-16550.o
+
+OBJCOPYFLAGS_vmlinux.bin := $(OBJCOPYFLAGS) -O binary -R .comment -S
+$(obj)/vmlinux.bin: $(KBUILD_IMAGE)
+	$(call if_changed,objcopy)
+
+suffix_$(CONFIG_KERNEL_GZIP)  = gz
+suffix_$(CONFIG_KERNEL_BZIP2) = bz2
+suffix_$(CONFIG_KERNEL_LZMA)  = lzma
+tool_$(CONFIG_KERNEL_GZIP)    = gzip
+tool_$(CONFIG_KERNEL_BZIP2)   = bzip2
+tool_$(CONFIG_KERNEL_LZMA)    = lzma
+$(obj)/vmlinux.$(suffix_y): $(obj)/vmlinux.bin
+	$(call if_changed,$(tool_y))
+
+$(obj)/piggy.o: $(obj)/vmlinux.$(suffix_y) $(obj)/dummy.o
+	$(Q)$(OBJCOPY) $(OBJCOPYFLAGS) \
+		--add-section=.image=$< \
+		--set-section-flags=.image=contents,alloc,load,readonly,data \
+		$(obj)/dummy.o $@
+
+LDFLAGS_vmlinuz := $(LDFLAGS) -Ttext $(VMLINUZ_LOAD_ADDRESS) -T
+vmlinuz: $(src)/ld.script $(obj-y) $(obj)/piggy.o
+	$(call if_changed,ld)
+	$(Q)$(OBJCOPY) $(OBJCOPYFLAGS) -R .comment -R .stab -R .stabstr -R .initrd -R .sysmap $@
+
+#
+# Some DECstations need all possible sections of an ECOFF executable
+#
+ifdef CONFIG_MACH_DECSTATION
+  E2EFLAGS = -a
+else
+  E2EFLAGS =
+endif
+
+# elf2ecoff can only handle 32bit image
+
+ifdef CONFIG_32BIT
+	VMLINUZ = vmlinuz
+else
+	VMLINUZ = vmlinuz.32
+endif
+
+vmlinuz.32: vmlinuz
+	$(Q)$(OBJCOPY) -O $(32bit-bfd) $(OBJCOPYFLAGS) $< $@
+
+vmlinuz.ecoff: $(obj)/../elf2ecoff $(VMLINUZ)
+	$(Q)$(obj)/../elf2ecoff $(VMLINUZ) vmlinuz.ecoff $(E2EFLAGS)
+
+$(obj)/../elf2ecoff: $(src)/../elf2ecoff.c
+	$(Q)$(HOSTCC) -o $@ $^
+
+drop-sections	= .reginfo .mdebug .comment .note .pdr .options .MIPS.options
+strip-flags	= $(addprefix --remove-section=,$(drop-sections))
+
+OBJCOPYFLAGS_vmlinuz.bin := $(OBJCOPYFLAGS) -O binary $(strip-flags)
+vmlinuz.bin: vmlinuz
+	$(call if_changed,objcopy)
+
+OBJCOPYFLAGS_vmlinuz.srec := $(OBJCOPYFLAGS) -S -O srec $(strip-flags)
+vmlinuz.srec: vmlinuz
+	$(call if_changed,objcopy)
+
+clean:
+clean-files += *.o \
+	       vmlinu*
+/*
+ * MIPS-specific debug support for pre-boot environment
+ *
+ * NOTE: putc() is board specific, if your board have a 16550 compatible uart,
+ * please select SYS_SUPPORTS_ZBOOT_UART16550 for your machine. othewise, you
+ * need to implement your own putc().
+ */
+
+#include <linux/init.h>
+#include <linux/types.h>
+
+void __attribute__ ((weak)) putc(char c)
+{
+}
+
+void puts(const char *s)
+{
+	char c;
+	while ((c = *s++) != '\0') {
+		putc(c);
+		if (c == '\n')
+			putc('\r');
+	}
+}
+
+void puthex(unsigned long long val)
+{
+
+	unsigned char buf[10];
+	int i;
+	for (i = 7; i >= 0; i--) {
+		buf[i] = "0123456789ABCDEF"[val & 0x0F];
+		val >>= 4;
+	}
+	buf[8] = '\0';
+	puts(buf);
+}
+/*
+ * 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");
+}
+int main(void)
+{
+	return 0;
+}
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1994, 1995 Waldorf Electronics
+ * Written by Ralf Baechle and Andreas Busse
+ * Copyright (C) 1995 - 1999 Ralf Baechle
+ * Copyright (C) 1996 Paul M. Antoine
+ * Modified for DECStation and hence R3000 support by Paul M. Antoine
+ * Further modifications by David S. Miller and Harald Koerfgen
+ * Copyright (C) 1999 Silicon Graphics, Inc.
+ */
+
+#include <asm/asm.h>
+#include <asm/regdef.h>
+
+	.set noreorder
+	.cprestore
+	LEAF(start)
+start:
+	/* Save boot rom start args */
+	move	s0, a0
+	move	s1, a1
+	move	s2, a2
+	move	s3, a3
+
+	/* Clear BSS */
+	PTR_LA	a0, _edata
+	PTR_LA	a2, _end
+1:	sw	zero, 0(a0)
+	bne	a2, a0, 1b
+	 addiu	a0, a0, 4
+
+	PTR_LA	a0, (.heap)          /* heap address */
+	PTR_LA  sp, (.stack + 8192)  /* stack address */
+
+	PTR_LA	ra, 2f
+	PTR_LA	k0, decompress_kernel
+	jr	k0
+	 nop
+2:
+	move	a0, s0
+	move	a1, s1
+	move	a2, s2
+	move	a3, s3
+	PTR_LI	k0, KERNEL_ENTRY
+	jr	k0
+	 nop
+3:
+	b	3b
+	 nop
+	END(start)
+
+	.comm .heap,BOOT_HEAP_SIZE,4
+	.comm .stack,4096*2,4
+OUTPUT_ARCH(mips)
+ENTRY(start)
+SECTIONS
+{
+  /* Read-only sections, merged into text segment: */
+  .init          : { *(.init)		} =0
+  .text      :
+  {
+    _ftext = . ;
+    *(.text)
+    *(.rodata)
+    *(.rodata1)
+    /* .gnu.warning sections are handled specially by elf32.em.  */
+    *(.gnu.warning)
+  } =0
+  .kstrtab : { *(.kstrtab) }
+
+  . = ALIGN(16);		/* Exception table */
+  __start___ex_table = .;
+  __ex_table : { *(__ex_table) }
+  __stop___ex_table = .;
+
+  __start___dbe_table = .;	/* Exception table for data bus errors */
+  __dbe_table : { *(__dbe_table) }
+  __stop___dbe_table = .;
+
+  __start___ksymtab = .;	/* Kernel symbol table */
+  __ksymtab : { *(__ksymtab) }
+  __stop___ksymtab = .;
+
+  _etext = .;
+
+  . = ALIGN(8192);
+  .data.init_task : { *(.data.init_task) }
+
+  /* Startup code */
+  . = ALIGN(4096);
+  __init_begin = .;
+  .text.init : { *(.text.init) }
+  .data.init : { *(.data.init) }
+  . = ALIGN(16);
+  __setup_start = .;
+  .setup.init : { *(.setup.init) }
+  __setup_end = .;
+  __initcall_start = .;
+  .initcall.init : { *(.initcall.init) }
+  __initcall_end = .;
+  . = ALIGN(4096);	/* Align double page for init_task_union */
+  __init_end = .;
+
+  . = ALIGN(4096);
+  .data.page_aligned : { *(.data.idt) }
+
+  . = ALIGN(32);
+  .data.cacheline_aligned : { *(.data.cacheline_aligned) }
+
+  .fini      : { *(.fini)    } =0
+  .reginfo : { *(.reginfo) }
+  /* Adjust the address for the data segment.  We want to adjust up to
+     the same address within the page on the next page up.  It would
+     be more correct to do this:
+       . = .;
+     The current expression does not correctly handle the case of a
+     text segment ending precisely at the end of a page; it causes the
+     data segment to skip a page.  The above expression does not have
+     this problem, but it will currently (2/95) cause BFD to allocate
+     a single segment, combining both text and data, for this case.
+     This will prevent the text segment from being shared among
+     multiple executions of the program; I think that is more
+     important than losing a page of the virtual address space (note
+     that no actual memory is lost; the page which is skipped can not
+     be referenced).  */
+  . = .;
+  .data    :
+  {
+    _fdata = . ;
+    *(.data)
+
+   /* Put the compressed image here, so bss is on the end. */
+   __image_begin = .;
+   *(.image)
+   __image_end = .;
+   /* Align the initial ramdisk image (INITRD) on page boundaries. */
+   . = ALIGN(4096);
+   __ramdisk_begin = .;
+   *(.initrd)
+   __ramdisk_end = .;
+   . = ALIGN(4096);
+
+    CONSTRUCTORS
+  }
+  .data1   : { *(.data1) }
+  _gp = . + 0x8000;
+  .lit8 : { *(.lit8) }
+  .lit4 : { *(.lit4) }
+  .ctors         : { *(.ctors)   }
+  .dtors         : { *(.dtors)   }
+  .got           : { *(.got.plt) *(.got) }
+  .dynamic       : { *(.dynamic) }
+  /* We want the small data sections together, so single-instruction offsets
+     can access them all, and initialized data all before uninitialized, so
+     we can shorten the on-disk segment size.  */
+  .sdata     : { *(.sdata) }
+  . = ALIGN(4);
+  _edata  =  .;
+  PROVIDE (edata = .);
+
+  __bss_start = .;
+  _fbss = .;
+  .sbss      : { *(.sbss) *(.scommon) }
+  .bss       :
+  {
+   *(.dynbss)
+   *(.bss)
+   *(COMMON)
+   .  = ALIGN(4);
+  _end = . ;
+  PROVIDE (end = .);
+  }
+
+  /* Sections to be discarded */
+  /DISCARD/ :
+  {
+        *(.text.exit)
+        *(.data.exit)
+        *(.exitcall.exit)
+  }
+
+  /* This is the MIPS specific mdebug section.  */
+  .mdebug : { *(.mdebug) }
+  /* These are needed for ELF backends which have not yet been
+     converted to the new style linker.  */
+  .stab 0 : { *(.stab) }
+  .stabstr 0 : { *(.stabstr) }
+  /* DWARF debug sections.
+     Symbols in the .debug DWARF section are relative to the beginning of the
+     section so we begin .debug at 0.  It's not clear yet what needs to happen
+     for the others.   */
+  .debug          0 : { *(.debug) }
+  .debug_srcinfo  0 : { *(.debug_srcinfo) }
+  .debug_aranges  0 : { *(.debug_aranges) }
+  .debug_pubnames 0 : { *(.debug_pubnames) }
+  .debug_sfnames  0 : { *(.debug_sfnames) }
+  .line           0 : { *(.line) }
+  /* These must appear regardless of  .  */
+  .gptab.sdata : { *(.gptab.data) *(.gptab.sdata) }
+  .gptab.sbss : { *(.gptab.bss) *(.gptab.sbss) }
+  .comment : { *(.comment) }
+  .note : { *(.note) }
+}
+/*
+ * 16550 compatible uart based serial debug support for zboot
+ */
+
+#include <linux/types.h>
+#include <linux/serial_reg.h>
+#include <linux/init.h>
+
+#include <asm/addrspace.h>
+
+#if defined(CONFIG_MACH_LOONGSON) || defined(CONFIG_MIPS_MALTA)
+#define UART_BASE 0x1fd003f8
+#define PORT(offset) (CKSEG1ADDR(UART_BASE) + (offset))
+#endif
+
+#ifdef CONFIG_AR7
+#include <ar7.h>
+#define PORT(offset) (CKSEG1ADDR(AR7_REGS_UART0) + (4 * offset))
+#endif
+
+#ifndef PORT
+#error please define the serial port address for your own machine
+#endif
+
+static inline unsigned int serial_in(int offset)
+{
+	return *((char *)PORT(offset));
+}
+
+static inline void serial_out(int offset, int value)
+{
+	*((char *)PORT(offset)) = value;
+}
+
+void putc(char c)
+{
+	int timeout = 1024;
+
+	while (((serial_in(UART_LSR) & UART_LSR_THRE) == 0) && (timeout-- > 0))
+		;
+
+	serial_out(UART_TX, c);
+}
...	...	@@ -22,6 +22,7 @@
22	22
23	23	config MACH_ALCHEMY
24	24	bool "Alchemy processor based machines"
	25	+ select SYS_SUPPORTS_ZBOOT
25	26
26	27	config AR7
27	28	bool "Texas Instruments AR7"
...	...	@@ -36,6 +37,7 @@
36	37	select SYS_HAS_EARLY_PRINTK
37	38	select SYS_SUPPORTS_32BIT_KERNEL
38	39	select SYS_SUPPORTS_LITTLE_ENDIAN
	40	+ select SYS_SUPPORTS_ZBOOT_UART16550
39	41	select GENERIC_GPIO
40	42	select GCD
41	43	select VLYNQ
...	...	@@ -192,6 +194,7 @@
192	194
193	195	config MACH_LOONGSON
194	196	bool "Loongson family of machines"
	197	+ select SYS_SUPPORTS_ZBOOT_UART16550
195	198	help
196	199	This enables the support of Loongson family of machines.
197	200
...	...	@@ -233,6 +236,7 @@
233	236	select SYS_SUPPORTS_MIPS_CMP
234	237	select SYS_SUPPORTS_MULTITHREADING
235	238	select SYS_SUPPORTS_SMARTMIPS
	239	+ select SYS_SUPPORTS_ZBOOT
236	240	help
237	241	This enables support for the MIPS Technologies Malta evaluation
238	242	board.
...	...	@@ -1293,6 +1297,16 @@
1293	1297	Full details can be found at http://www.caviumnetworks.com.
1294	1298
1295	1299	endchoice
	1300	+
	1301	+config SYS_SUPPORTS_ZBOOT
	1302	+ bool
	1303	+ select HAVE_KERNEL_GZIP
	1304	+ select HAVE_KERNEL_BZIP2
	1305	+ select HAVE_KERNEL_LZMA
	1306	+
	1307	+config SYS_SUPPORTS_ZBOOT_UART16550
	1308	+ bool
	1309	+ select SYS_SUPPORTS_ZBOOT
1296	1310
1297	1311	config CPU_LOONGSON2
1298	1312	bool
...	...	@@ -69,6 +69,7 @@
69	69
70	70	all-$(CONFIG_BOOT_ELF32) := $(vmlinux-32)
71	71	all-$(CONFIG_BOOT_ELF64) := $(vmlinux-64)
	72	+all-$(CONFIG_SYS_SUPPORTS_ZBOOT)+= vmlinuz
72	73
73	74	#
74	75	# GCC uses -G 0 -mabicalls -fpic as default. We don't want PIC in the kernel
...	...	@@ -331,7 +332,7 @@
331	332	core-$(CONFIG_MIPS_MALTA) += arch/mips/mti-malta/
332	333	cflags-$(CONFIG_MIPS_MALTA) += -I$(srctree)/arch/mips/include/asm/mach-malta
333	334	load-$(CONFIG_MIPS_MALTA) += 0xffffffff80100000
334		-all-$(CONFIG_MIPS_MALTA) := vmlinux.bin
	335	+all-$(CONFIG_MIPS_MALTA) := vmlinuz.bin
335	336
336	337	#
337	338	# MIPS SIM
...	...	@@ -581,7 +582,7 @@
581	582	else
582	583	load-$(CONFIG_SNI_RM) += 0xffffffff80030000
583	584	endif
584		-all-$(CONFIG_SNI_RM) := vmlinux.ecoff
	585	+all-$(CONFIG_SNI_RM) := vmlinuz.ecoff
585	586
586	587	#
587	588	# Common TXx9
588	589
...	...	@@ -699,9 +700,23 @@
699	700	$(OBJCOPY) -O $(64bit-bfd) $(OBJCOPYFLAGS) $< $@
700	701
701	702	makeboot =$(Q)$(MAKE) $(build)=arch/mips/boot VMLINUX=$(vmlinux-32) $(1)
	703	+makezboot =$(Q)$(MAKE) $(build)=arch/mips/boot/compressed \
	704	+ VMLINUX_LOAD_ADDRESS=$(load-y) 32bit-bfd=$(32bit-bfd) $(1)
702	705
703	706	all: $(all-y)
704	707
	708	+vmlinuz: vmlinux FORCE
	709	+ +@$(call makezboot,$@)
	710	+
	711	+vmlinuz.bin: vmlinux
	712	+ +@$(call makezboot,$@)
	713	+
	714	+vmlinuz.ecoff: vmlinux
	715	+ +@$(call makezboot,$@)
	716	+
	717	+vmlinuz.srec: vmlinux
	718	+ +@$(call makezboot,$@)
	719	+
705	720	vmlinux.bin: $(vmlinux-32)
706	721	+@$(call makeboot,$@)
707	722
708	723
...	...	@@ -726,11 +741,13 @@
726	741
727	742	install:
728	743	$(Q)install -D -m 755 vmlinux $(INSTALL_PATH)/vmlinux-$(KERNELRELEASE)
	744	+ $(Q)install -D -m 755 vmlinuz $(INSTALL_PATH)/vmlinuz-$(KERNELRELEASE)
729	745	$(Q)install -D -m 644 .config $(INSTALL_PATH)/config-$(KERNELRELEASE)
730	746	$(Q)install -D -m 644 System.map $(INSTALL_PATH)/System.map-$(KERNELRELEASE)
731	747
732	748	archclean:
733	749	@$(MAKE) $(clean)=arch/mips/boot
	750	+ @$(MAKE) $(clean)=arch/mips/boot/compressed
734	751	@$(MAKE) $(clean)=arch/mips/lasat
735	752
736	753	define archhelp
737	754
...	...	@@ -738,11 +755,19 @@
738	755	echo ' vmlinux.ecoff - ECOFF boot image'
739	756	echo ' vmlinux.bin - Raw binary boot image'
740	757	echo ' vmlinux.srec - SREC boot image'
	758	+ echo ' vmlinuz - Compressed boot(zboot) image'
	759	+ echo ' vmlinuz.ecoff - ECOFF zboot image'
	760	+ echo ' vmlinuz.bin - Raw binary zboot image'
	761	+ echo ' vmlinuz.srec - SREC zboot image'
741	762	echo
742	763	echo ' These will be default as apropriate for a configured platform.'
743	764	endef
744	765
745	766	CLEAN_FILES += vmlinux.32 \
746	767	vmlinux.64 \
747		- vmlinux.ecoff
	768	+ vmlinux.ecoff \
	769	+ vmlinuz \
	770	+ vmlinuz.ecoff \
	771	+ vmlinuz.bin \
	772	+ vmlinuz.srec
	1	+#
	2	+# This file is subject to the terms and conditions of the GNU General Public
	3	+# License.
	4	+#
	5	+# Adapted for MIPS Pete Popov, Dan Malek
	6	+#
	7	+# Copyright (C) 1994 by Linus Torvalds
	8	+# Adapted for PowerPC by Gary Thomas
	9	+# modified by Cort (cort@cs.nmt.edu)
	10	+#
	11	+# Copyright (C) 2009 Lemote Inc. & DSLab, Lanzhou University
	12	+# Author: Wu Zhangjin <wuzj@lemote.com>
	13	+#
	14	+
	15	+# compressed kernel load addr: VMLINUZ_LOAD_ADDRESS > VMLINUX_LOAD_ADDRESS + VMLINUX_SIZE
	16	+VMLINUX_SIZE := $(shell wc -c $(objtree)/$(KBUILD_IMAGE) 2>/dev/null \| cut -d' ' -f1)
	17	+VMLINUX_SIZE := $(shell [ -n "$(VMLINUX_SIZE)" ] && echo $$(($(VMLINUX_SIZE) + (65536 - $(VMLINUX_SIZE) % 65536))))
	18	+VMLINUZ_LOAD_ADDRESS := 0x$(shell [ -n "$(VMLINUX_SIZE)" ] && printf %x $$(($(VMLINUX_LOAD_ADDRESS) + $(VMLINUX_SIZE))))
	19	+
	20	+# set the default size of the mallocing area for decompressing
	21	+BOOT_HEAP_SIZE := 0x400000
	22	+
	23	+# Disable Function Tracer
	24	+KBUILD_CFLAGS := $(shell echo $(KBUILD_CFLAGS) \| sed -e "s/-pg//")
	25	+
	26	+KBUILD_CFLAGS := $(LINUXINCLUDE) $(KBUILD_CFLAGS) -D__KERNEL__ \
	27	+ -DBOOT_HEAP_SIZE=$(BOOT_HEAP_SIZE) -D"VMLINUX_LOAD_ADDRESS_ULL=$(VMLINUX_LOAD_ADDRESS)ull" \
	28	+
	29	+KBUILD_AFLAGS := $(LINUXINCLUDE) $(KBUILD_AFLAGS) -D__ASSEMBLY__ \
	30	+ -DKERNEL_ENTRY=0x$(shell $(NM) $(objtree)/$(KBUILD_IMAGE) 2>/dev/null \| grep " kernel_entry" \| cut -f1 -d \ ) \
	31	+ -DBOOT_HEAP_SIZE=$(BOOT_HEAP_SIZE)
	32	+
	33	+obj-y := $(obj)/head.o $(obj)/decompress.o $(obj)/dbg.o
	34	+
	35	+obj-$(CONFIG_SYS_SUPPORTS_ZBOOT_UART16550) += $(obj)/uart-16550.o
	36	+
	37	+OBJCOPYFLAGS_vmlinux.bin := $(OBJCOPYFLAGS) -O binary -R .comment -S
	38	+$(obj)/vmlinux.bin: $(KBUILD_IMAGE)
	39	+ $(call if_changed,objcopy)
	40	+
	41	+suffix_$(CONFIG_KERNEL_GZIP) = gz
	42	+suffix_$(CONFIG_KERNEL_BZIP2) = bz2
	43	+suffix_$(CONFIG_KERNEL_LZMA) = lzma
	44	+tool_$(CONFIG_KERNEL_GZIP) = gzip
	45	+tool_$(CONFIG_KERNEL_BZIP2) = bzip2
	46	+tool_$(CONFIG_KERNEL_LZMA) = lzma
	47	+$(obj)/vmlinux.$(suffix_y): $(obj)/vmlinux.bin
	48	+ $(call if_changed,$(tool_y))
	49	+
	50	+$(obj)/piggy.o: $(obj)/vmlinux.$(suffix_y) $(obj)/dummy.o
	51	+ $(Q)$(OBJCOPY) $(OBJCOPYFLAGS) \
	52	+ --add-section=.image=$< \
	53	+ --set-section-flags=.image=contents,alloc,load,readonly,data \
	54	+ $(obj)/dummy.o $@
	55	+
	56	+LDFLAGS_vmlinuz := $(LDFLAGS) -Ttext $(VMLINUZ_LOAD_ADDRESS) -T
	57	+vmlinuz: $(src)/ld.script $(obj-y) $(obj)/piggy.o
	58	+ $(call if_changed,ld)
	59	+ $(Q)$(OBJCOPY) $(OBJCOPYFLAGS) -R .comment -R .stab -R .stabstr -R .initrd -R .sysmap $@
	60	+
	61	+#
	62	+# Some DECstations need all possible sections of an ECOFF executable
	63	+#
	64	+ifdef CONFIG_MACH_DECSTATION
	65	+ E2EFLAGS = -a
	66	+else
	67	+ E2EFLAGS =
	68	+endif
	69	+
	70	+# elf2ecoff can only handle 32bit image
	71	+
	72	+ifdef CONFIG_32BIT
	73	+ VMLINUZ = vmlinuz
	74	+else
	75	+ VMLINUZ = vmlinuz.32
	76	+endif
	77	+
	78	+vmlinuz.32: vmlinuz
	79	+ $(Q)$(OBJCOPY) -O $(32bit-bfd) $(OBJCOPYFLAGS) $< $@
	80	+
	81	+vmlinuz.ecoff: $(obj)/../elf2ecoff $(VMLINUZ)
	82	+ $(Q)$(obj)/../elf2ecoff $(VMLINUZ) vmlinuz.ecoff $(E2EFLAGS)
	83	+
	84	+$(obj)/../elf2ecoff: $(src)/../elf2ecoff.c
	85	+ $(Q)$(HOSTCC) -o $@ $^
	86	+
	87	+drop-sections = .reginfo .mdebug .comment .note .pdr .options .MIPS.options
	88	+strip-flags = $(addprefix --remove-section=,$(drop-sections))
	89	+
	90	+OBJCOPYFLAGS_vmlinuz.bin := $(OBJCOPYFLAGS) -O binary $(strip-flags)
	91	+vmlinuz.bin: vmlinuz
	92	+ $(call if_changed,objcopy)
	93	+
	94	+OBJCOPYFLAGS_vmlinuz.srec := $(OBJCOPYFLAGS) -S -O srec $(strip-flags)
	95	+vmlinuz.srec: vmlinuz
	96	+ $(call if_changed,objcopy)
	97	+
	98	+clean:
	99	+clean-files += *.o \
	100	+ vmlinu*
	1	+/*
	2	+ * MIPS-specific debug support for pre-boot environment
	3	+ *
	4	+ * NOTE: putc() is board specific, if your board have a 16550 compatible uart,
	5	+ * please select SYS_SUPPORTS_ZBOOT_UART16550 for your machine. othewise, you
	6	+ * need to implement your own putc().
	7	+ */
	8	+
	9	+#include <linux/init.h>
	10	+#include <linux/types.h>
	11	+
	12	+void __attribute__ ((weak)) putc(char c)
	13	+{
	14	+}
	15	+
	16	+void puts(const char *s)
	17	+{
	18	+ char c;
	19	+ while ((c = *s++) != '\0') {
	20	+ putc(c);
	21	+ if (c == '\n')
	22	+ putc('\r');
	23	+ }
	24	+}
	25	+
	26	+void puthex(unsigned long long val)
	27	+{
	28	+
	29	+ unsigned char buf[10];
	30	+ int i;
	31	+ for (i = 7; i >= 0; i--) {
	32	+ buf[i] = "0123456789ABCDEF"[val & 0x0F];
	33	+ val >>= 4;
	34	+ }
	35	+ buf[8] = '\0';
	36	+ puts(buf);
	37	+}
	1	+/*
	2	+ * Misc. bootloader code for many machines.
	3	+ *
	4	+ * Copyright 2001 MontaVista Software Inc.
	5	+ * Author: Matt Porter <mporter@mvista.com> Derived from
	6	+ * arch/ppc/boot/prep/misc.c
	7	+ *
	8	+ * Copyright (C) 2009 Lemote, Inc. & Institute of Computing Technology
	9	+ * Author: Wu Zhangjin <wuzj@lemote.com>
	10	+ *
	11	+ * This program is free software; you can redistribute it and/or modify it
	12	+ * under the terms of the GNU General Public License as published by the
	13	+ * Free Software Foundation; either version 2 of the License, or (at your
	14	+ * option) any later version.
	15	+ */
	16	+
	17	+#include <linux/types.h>
	18	+#include <linux/kernel.h>
	19	+
	20	+#include <asm/addrspace.h>
	21	+
	22	+/* These two variables specify the free mem region
	23	+ * that can be used for temporary malloc area
	24	+ */
	25	+unsigned long free_mem_ptr;
	26	+unsigned long free_mem_end_ptr;
	27	+char *zimage_start;
	28	+
	29	+/* The linker tells us where the image is. */
	30	+extern unsigned char __image_begin, __image_end;
	31	+extern unsigned char __ramdisk_begin, __ramdisk_end;
	32	+unsigned long initrd_size;
	33	+
	34	+/* debug interfaces */
	35	+extern void puts(const char *s);
	36	+extern void puthex(unsigned long long val);
	37	+
	38	+void error(char *x)
	39	+{
	40	+ puts("\n\n");
	41	+ puts(x);
	42	+ puts("\n\n -- System halted");
	43	+
	44	+ while (1)
	45	+ ; /* Halt */
	46	+}
	47	+
	48	+/* activate the code for pre-boot environment */
	49	+#define STATIC static
	50	+
	51	+#ifdef CONFIG_KERNEL_GZIP
	52	+void memcpy(void dest, const void *src, size_t n)
	53	+{
	54	+ int i;
	55	+ const char *s = src;
	56	+ char *d = dest;
	57	+
	58	+ for (i = 0; i < n; i++)
	59	+ d[i] = s[i];
	60	+ return dest;
	61	+}
	62	+#include "../../../../lib/decompress_inflate.c"
	63	+#endif
	64	+
	65	+#ifdef CONFIG_KERNEL_BZIP2
	66	+void memset(void s, int c, size_t n)
	67	+{
	68	+ int i;
	69	+ char *ss = s;
	70	+
	71	+ for (i = 0; i < n; i++)
	72	+ ss[i] = c;
	73	+ return s;
	74	+}
	75	+#include "../../../../lib/decompress_bunzip2.c"
	76	+#endif
	77	+
	78	+#ifdef CONFIG_KERNEL_LZMA
	79	+#include "../../../../lib/decompress_unlzma.c"
	80	+#endif
	81	+
	82	+void decompress_kernel(unsigned long boot_heap_start)
	83	+{
	84	+ int zimage_size;
	85	+
	86	+ /*
	87	+ * We link ourself to an arbitrary low address. When we run, we
	88	+ * relocate outself to that address. __image_beign points to
	89	+ * the part of the image where the zImage is. -- Tom
	90	+ */
	91	+ zimage_start = (char *)(unsigned long)(&__image_begin);
	92	+ zimage_size = (unsigned long)(&__image_end) -
	93	+ (unsigned long)(&__image_begin);
	94	+
	95	+ /*
	96	+ * The zImage and initrd will be between start and _end, so they've
	97	+ * already been moved once. We're good to go now. -- Tom
	98	+ */
	99	+ puts("zimage at: ");
	100	+ puthex((unsigned long)zimage_start);
	101	+ puts(" ");
	102	+ puthex((unsigned long)(zimage_size + zimage_start));
	103	+ puts("\n");
	104	+
	105	+ if (initrd_size) {
	106	+ puts("initrd at: ");
	107	+ puthex((unsigned long)(&__ramdisk_begin));
	108	+ puts(" ");
	109	+ puthex((unsigned long)(&__ramdisk_end));
	110	+ puts("\n");
	111	+ }
	112	+
	113	+ /* this area are prepared for mallocing when decompressing */
	114	+ free_mem_ptr = boot_heap_start;
	115	+ free_mem_end_ptr = boot_heap_start + BOOT_HEAP_SIZE;
	116	+
	117	+ /* Display standard Linux/MIPS boot prompt for kernel args */
	118	+ puts("Uncompressing Linux at load address ");
	119	+ puthex(VMLINUX_LOAD_ADDRESS_ULL);
	120	+ puts("\n");
	121	+ /* Decompress the kernel with according algorithm */
	122	+ decompress(zimage_start, zimage_size, 0, 0,
	123	+ (void *)VMLINUX_LOAD_ADDRESS_ULL, 0, error);
	124	+ /* FIXME: is there a need to flush cache here? */
	125	+ puts("Now, booting the kernel...\n");
	126	+}
	1	+/*
	2	+ * This file is subject to the terms and conditions of the GNU General Public
	3	+ * License. See the file "COPYING" in the main directory of this archive
	4	+ * for more details.
	5	+ *
	6	+ * Copyright (C) 1994, 1995 Waldorf Electronics
	7	+ * Written by Ralf Baechle and Andreas Busse
	8	+ * Copyright (C) 1995 - 1999 Ralf Baechle
	9	+ * Copyright (C) 1996 Paul M. Antoine
	10	+ * Modified for DECStation and hence R3000 support by Paul M. Antoine
	11	+ * Further modifications by David S. Miller and Harald Koerfgen
	12	+ * Copyright (C) 1999 Silicon Graphics, Inc.
	13	+ */
	14	+
	15	+#include <asm/asm.h>
	16	+#include <asm/regdef.h>
	17	+
	18	+ .set noreorder
	19	+ .cprestore
	20	+ LEAF(start)
	21	+start:
	22	+ /* Save boot rom start args */
	23	+ move s0, a0
	24	+ move s1, a1
	25	+ move s2, a2
	26	+ move s3, a3
	27	+
	28	+ /* Clear BSS */
	29	+ PTR_LA a0, _edata
	30	+ PTR_LA a2, _end
	31	+1: sw zero, 0(a0)
	32	+ bne a2, a0, 1b
	33	+ addiu a0, a0, 4
	34	+
	35	+ PTR_LA a0, (.heap) /* heap address */
	36	+ PTR_LA sp, (.stack + 8192) /* stack address */
	37	+
	38	+ PTR_LA ra, 2f
	39	+ PTR_LA k0, decompress_kernel
	40	+ jr k0
	41	+ nop
	42	+2:
	43	+ move a0, s0
	44	+ move a1, s1
	45	+ move a2, s2
	46	+ move a3, s3
	47	+ PTR_LI k0, KERNEL_ENTRY
	48	+ jr k0
	49	+ nop
	50	+3:
	51	+ b 3b
	52	+ nop
	53	+ END(start)
	54	+
	55	+ .comm .heap,BOOT_HEAP_SIZE,4
	56	+ .comm .stack,4096*2,4
	1	+OUTPUT_ARCH(mips)
	2	+ENTRY(start)
	3	+SECTIONS
	4	+{
	5	+ /* Read-only sections, merged into text segment: */
	6	+ .init : { *(.init) } =0
	7	+ .text :
	8	+ {
	9	+ _ftext = . ;
	10	+ *(.text)
	11	+ *(.rodata)
	12	+ *(.rodata1)
	13	+ /* .gnu.warning sections are handled specially by elf32.em. */
	14	+ *(.gnu.warning)
	15	+ } =0
	16	+ .kstrtab : { *(.kstrtab) }
	17	+
	18	+ . = ALIGN(16); /* Exception table */
	19	+ __start___ex_table = .;
	20	+ __ex_table : { *(__ex_table) }
	21	+ __stop___ex_table = .;
	22	+
	23	+ __start___dbe_table = .; /* Exception table for data bus errors */
	24	+ __dbe_table : { *(__dbe_table) }
	25	+ __stop___dbe_table = .;
	26	+
	27	+ __start___ksymtab = .; /* Kernel symbol table */
	28	+ __ksymtab : { *(__ksymtab) }
	29	+ __stop___ksymtab = .;
	30	+
	31	+ _etext = .;
	32	+
	33	+ . = ALIGN(8192);
	34	+ .data.init_task : { *(.data.init_task) }
	35	+
	36	+ /* Startup code */
	37	+ . = ALIGN(4096);
	38	+ __init_begin = .;
	39	+ .text.init : { *(.text.init) }
	40	+ .data.init : { *(.data.init) }
	41	+ . = ALIGN(16);
	42	+ __setup_start = .;
	43	+ .setup.init : { *(.setup.init) }
	44	+ __setup_end = .;
	45	+ __initcall_start = .;
	46	+ .initcall.init : { *(.initcall.init) }
	47	+ __initcall_end = .;
	48	+ . = ALIGN(4096); /* Align double page for init_task_union */
	49	+ __init_end = .;
	50	+
	51	+ . = ALIGN(4096);
	52	+ .data.page_aligned : { *(.data.idt) }
	53	+
	54	+ . = ALIGN(32);
	55	+ .data.cacheline_aligned : { *(.data.cacheline_aligned) }
	56	+
	57	+ .fini : { *(.fini) } =0
	58	+ .reginfo : { *(.reginfo) }
	59	+ /* Adjust the address for the data segment. We want to adjust up to
	60	+ the same address within the page on the next page up. It would
	61	+ be more correct to do this:
	62	+ . = .;
	63	+ The current expression does not correctly handle the case of a
	64	+ text segment ending precisely at the end of a page; it causes the
	65	+ data segment to skip a page. The above expression does not have
	66	+ this problem, but it will currently (2/95) cause BFD to allocate
	67	+ a single segment, combining both text and data, for this case.
	68	+ This will prevent the text segment from being shared among
	69	+ multiple executions of the program; I think that is more
	70	+ important than losing a page of the virtual address space (note
	71	+ that no actual memory is lost; the page which is skipped can not
	72	+ be referenced). */
	73	+ . = .;
	74	+ .data :
	75	+ {
	76	+ _fdata = . ;
	77	+ *(.data)
	78	+
	79	+ /* Put the compressed image here, so bss is on the end. */
	80	+ __image_begin = .;
	81	+ *(.image)
	82	+ __image_end = .;
	83	+ /* Align the initial ramdisk image (INITRD) on page boundaries. */
	84	+ . = ALIGN(4096);
	85	+ __ramdisk_begin = .;
	86	+ *(.initrd)
	87	+ __ramdisk_end = .;
	88	+ . = ALIGN(4096);
	89	+
	90	+ CONSTRUCTORS
	91	+ }
	92	+ .data1 : { *(.data1) }
	93	+ _gp = . + 0x8000;
	94	+ .lit8 : { *(.lit8) }
	95	+ .lit4 : { *(.lit4) }
	96	+ .ctors : { *(.ctors) }
	97	+ .dtors : { *(.dtors) }
	98	+ .got : { (.got.plt) (.got) }
	99	+ .dynamic : { *(.dynamic) }
	100	+ /* We want the small data sections together, so single-instruction offsets
	101	+ can access them all, and initialized data all before uninitialized, so
	102	+ we can shorten the on-disk segment size. */
	103	+ .sdata : { *(.sdata) }
	104	+ . = ALIGN(4);
	105	+ _edata = .;
	106	+ PROVIDE (edata = .);
	107	+
	108	+ __bss_start = .;
	109	+ _fbss = .;
	110	+ .sbss : { (.sbss) (.scommon) }
	111	+ .bss :
	112	+ {
	113	+ *(.dynbss)
	114	+ *(.bss)
	115	+ *(COMMON)
	116	+ . = ALIGN(4);
	117	+ _end = . ;
	118	+ PROVIDE (end = .);
	119	+ }
	120	+
	121	+ /* Sections to be discarded */
	122	+ /DISCARD/ :
	123	+ {
	124	+ *(.text.exit)
	125	+ *(.data.exit)
	126	+ *(.exitcall.exit)
	127	+ }
	128	+
	129	+ /* This is the MIPS specific mdebug section. */
	130	+ .mdebug : { *(.mdebug) }
	131	+ /* These are needed for ELF backends which have not yet been
	132	+ converted to the new style linker. */
	133	+ .stab 0 : { *(.stab) }
	134	+ .stabstr 0 : { *(.stabstr) }
	135	+ /* DWARF debug sections.
	136	+ Symbols in the .debug DWARF section are relative to the beginning of the
	137	+ section so we begin .debug at 0. It's not clear yet what needs to happen
	138	+ for the others. */
	139	+ .debug 0 : { *(.debug) }
	140	+ .debug_srcinfo 0 : { *(.debug_srcinfo) }
	141	+ .debug_aranges 0 : { *(.debug_aranges) }
	142	+ .debug_pubnames 0 : { *(.debug_pubnames) }
	143	+ .debug_sfnames 0 : { *(.debug_sfnames) }
	144	+ .line 0 : { *(.line) }
	145	+ /* These must appear regardless of . */
	146	+ .gptab.sdata : { (.gptab.data) (.gptab.sdata) }
	147	+ .gptab.sbss : { (.gptab.bss) (.gptab.sbss) }
	148	+ .comment : { *(.comment) }
	149	+ .note : { *(.note) }
	150	+}
	1	+/*
	2	+ * 16550 compatible uart based serial debug support for zboot
	3	+ */
	4	+
	5	+#include <linux/types.h>
	6	+#include <linux/serial_reg.h>
	7	+#include <linux/init.h>
	8	+
	9	+#include <asm/addrspace.h>
	10	+
	11	+#if defined(CONFIG_MACH_LOONGSON) \|\| defined(CONFIG_MIPS_MALTA)
	12	+#define UART_BASE 0x1fd003f8
	13	+#define PORT(offset) (CKSEG1ADDR(UART_BASE) + (offset))
	14	+#endif
	15	+
	16	+#ifdef CONFIG_AR7
	17	+#include <ar7.h>
	18	+#define PORT(offset) (CKSEG1ADDR(AR7_REGS_UART0) + (4 * offset))
	19	+#endif
	20	+
	21	+#ifndef PORT
	22	+#error please define the serial port address for your own machine
	23	+#endif
	24	+
	25	+static inline unsigned int serial_in(int offset)
	26	+{
	27	+ return ((char )PORT(offset));
	28	+}
	29	+
	30	+static inline void serial_out(int offset, int value)
	31	+{
	32	+ ((char )PORT(offset)) = value;
	33	+}
	34	+
	35	+void putc(char c)
	36	+{
	37	+ int timeout = 1024;
	38	+
	39	+ while (((serial_in(UART_LSR) & UART_LSR_THRE) == 0) && (timeout-- > 0))
	40	+ ;
	41	+
	42	+ serial_out(UART_TX, c);
	43	+}