Commit 4bedea94 authored by Chris Zankel's avatar Chris Zankel Committed by Linus Torvalds
Browse files

[PATCH] xtensa: Architecture support for Tensilica Xtensa Part 2



The attached patches provides part 2 of an architecture implementation for the
Tensilica Xtensa CPU series.
Signed-off-by: default avatarChris Zankel <chris@zankel.net>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 8e1a6dd2
#
# arch/xtensa/boot/Makefile
#
# 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.
#
#
CFLAGS += -fno-builtin -Iarch/$(ARCH)/boot/include
HOSTFLAGS += -Iarch/$(ARCH)/boot/include
BIG_ENDIAN := $(shell echo -e "\#ifdef __XTENSA_EL__\nint little;\n\#else\nint big;\n\#endif" | $(CC) -E -|grep -c big)
export CFLAGS
export AFLAGS
export BIG_ENDIAN
# Subdirs for the boot loader(s)
bootdir-$(CONFIG_XTENSA_PLATFORM_ISS) += boot-elf
bootdir-$(CONFIG_XTENSA_PLATFORM_XT2000) += boot-redboot boot-elf
subdir-y := lib/
subdir-y += boot-elf/ boot-redboot/
zImage zImage.initrd Image Image.initrd: $(bootdir-y)
$(bootdir-y): $(addprefix $(obj)/,$(subdir-y)) \
$(addprefix $(obj)/,$(host-progs))
$(Q)$(MAKE) $(build)=$(obj)/$@ $(MAKECMDGOALS)
#
# This file is subject to the terms and conditions of the GNU General Public
# License. See the file "COPYING" in the main directory of this archive
# for more details.
#
GZIP = gzip
GZIP_FLAGS = -v9fc
ifeq ($(BIG_ENDIAN),1)
OBJCOPY_ARGS := -O elf32-xtensa-be
else
OBJCOPY_ARGS := -O elf32-xtensa-le
endif
export OBJCOPY_ARGS
boot-y := bootstrap.o
OBJS := $(addprefix $(obj)/,$(boot-y))
Image: vmlinux $(OBJS)
$(OBJCOPY) --strip-all -R .comment -R .xt.insn -O binary \
vmlinux vmlinux.tmp
$(OBJCOPY) $(OBJCOPY_ARGS) -R .comment \
--add-section image=vmlinux.tmp \
--set-section-flags image=contents,alloc,load,load,data \
$(OBJS) $@.tmp
$(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) \
-T arch/$(ARCH)/boot/boot-elf/boot.ld \
-o arch/$(ARCH)/boot/$@.elf $@.tmp
rm -f $@.tmp vmlinux.tmp
Image.initrd: vmlinux $(OBJS)
$(OBJCOPY) --strip-all -R .comment -R .xt.insn -O binary \
--add-section .initrd=arch/$(ARCH)/boot/ramdisk \
--set-section-flags .initrd=contents,alloc,load,load,data \
vmlinux vmlinux.tmp
$(OBJCOPY) $(OBJCOPY_ARGS) -R .comment \
--add-section image=vmlinux.tmp \
--set-section-flags image=contents,alloc,load,load,data \
$(OBJS) $@.tmp
$(LD) $(LDFLAGS) $(LDFLAGS_vmlinux) \
-T arch/$(ARCH)/boot/boot-elf/boot.ld \
-o arch/$(ARCH)/boot/$@.elf $@.tmp
rm -f $@.tmp vmlinux.tmp
zImage: Image
zImage.initrd: Image.initrd
OUTPUT_ARCH(xtensa)
SECTIONS
{
.start 0xD0000000 : { *(.start) }
.text 0xD0000000:
{
__reloc_start = . ;
_text_start = . ;
*(.literal .text.literal .text)
_text_end = . ;
}
.rodata ALIGN(0x04):
{
*(.rodata)
*(.rodata1)
}
.data ALIGN(0x04):
{
*(.data)
*(.data1)
*(.sdata)
*(.sdata2)
*(.got.plt)
*(.got)
*(.dynamic)
}
__reloc_end = . ;
.initrd ALIGN(0x10) :
{
boot_initrd_start = . ;
*(.initrd)
boot_initrd_end = .;
}
. = ALIGN(0x10);
__image_load = . ;
.image 0xd0001000:
{
_image_start = .;
*(image)
. = (. + 3) & ~ 3;
_image_end = . ;
}
.bss ((LOADADDR(.image) + SIZEOF(.image) + 3) & ~ 3):
{
__bss_start = .;
*(.sbss)
*(.scommon)
*(.dynbss)
*(.bss)
__bss_end = .;
}
_end = .;
_param_start = .;
.ResetVector.text 0xfe000020 :
{
*(.ResetVector.text)
}
PROVIDE (end = .);
}
#include <xtensa/config/specreg.h>
#include <xtensa/config/core.h>
#include <linux/config.h>
#include <asm/bootparam.h>
/* ResetVector
*/
.section .ResetVector.text, "ax"
.global _ResetVector
_ResetVector:
_j reset
.align 4
RomInitAddr:
.word 0xd0001000
RomBootParam:
.word _bootparam
reset:
l32r a0, RomInitAddr
l32r a2, RomBootParam
movi a3, 0
movi a4, 0
jx a0
.align 4
.section .bootstrap.data, "aw"
.globl _bootparam
_bootparam:
.short BP_TAG_FIRST
.short 4
.long BP_VERSION
.short BP_TAG_LAST
.short 0
.long 0
#
# This file is subject to the terms and conditions of the GNU General Public
# License. See the file "COPYING" in the main directory of this archive
# for more details.
#
GZIP = gzip
GZIP_FLAGS = -v9fc
ifeq ($(BIG_ENDIAN),1)
OBJCOPY_ARGS := -O elf32-xtensa-be
else
OBJCOPY_ARGS := -O elf32-xtensa-le
endif
LD_ARGS = -T $(obj)/boot.ld
boot-y := bootstrap.o
OBJS := $(addprefix $(obj)/,$(boot-y))
LIBS := arch/$(ARCH)/boot/lib/lib.a arch/$(ARCH)/lib/lib.a
LIBGCC := $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
zImage: vmlinux $(OBJS) $(LIBS)
$(OBJCOPY) --strip-all -R .comment -R .xt.insn -O binary \
$(TOPDIR)/vmlinux vmlinux.tmp
gzip -vf9 vmlinux.tmp
$(OBJCOPY) $(OBJCOPY_ARGS) -R .comment \
--add-section image=vmlinux.tmp.gz \
--set-section-flags image=contents,alloc,load,load,data \
$(OBJS) $@.tmp
$(LD) $(LD_ARGS) -o $@.elf $@.tmp $(LIBS) -L/xtensa-elf/lib $(LIBGCC)
$(OBJCOPY) -S -O binary $@.elf arch/$(ARCH)/boot/images/$@.redboot
# rm -f $@.tmp $@.elf vmlinux.tmp.gz
OUTPUT_ARCH(xtensa)
SECTIONS
{
.start 0xD0200000 : { *(.start) }
.text :
{
__reloc_start = . ;
_text_start = . ;
*(.literal .text.literal .text)
_text_end = . ;
}
.rodata ALIGN(0x04):
{
*(.rodata)
*(.rodata1)
}
.data ALIGN(0x04):
{
*(.data)
*(.data1)
*(.sdata)
*(.sdata2)
*(.got.plt)
*(.got)
*(.dynamic)
}
__reloc_end = . ;
.initrd ALIGN(0x10) :
{
boot_initrd_start = . ;
*(.initrd)
boot_initrd_end = .;
}
. = ALIGN(0x10);
__image_load = . ;
.image 0xd0001000: AT(__image_load)
{
_image_start = .;
*(image)
. = (. + 3) & ~ 3;
_image_end = . ;
}
.bss ((LOADADDR(.image) + SIZEOF(.image) + 3) & ~ 3):
{
__bss_start = .;
*(.sbss)
*(.scommon)
*(.dynbss)
*(.bss)
__bss_end = .;
}
_end = .;
_param_start = .;
PROVIDE (end = .);
}
#define _ASMLANGUAGE
#include <xtensa/config/specreg.h>
#include <xtensa/config/core.h>
#include <xtensa/cacheasm.h>
/*
* RB-Data: RedBoot data/bss
* P: Boot-Parameters
* L: Kernel-Loader
*
* The Linux-Kernel image including the loader must be loaded
* to a position so that the kernel and the boot parameters
* can fit in the space before the load address.
* ______________________________________________________
* |_RB-Data_|_P_|__________|_L_|___Linux-Kernel___|______|
* ^
* ^ Load address
* ______________________________________________________
* |___Linux-Kernel___|_P_|_L_|___________________________|
*
* The loader copies the parameter to the position that will
* be the end of the kernel and itself to the end of the
* parameter list.
*/
/* Make sure we have enough space for the 'uncompressor' */
#define STACK_SIZE 32768
#define HEAP_SIZE (131072*4)
# a2: Parameter list
# a3: Size of parameter list
.section .start, "ax"
.globl __start
/* this must be the first byte of the loader! */
__start:
entry sp, 32 # we do not intend to return
_call0 _start
__start_a0:
.align 4
.section .text, "ax"
.begin literal_prefix .text
/* put literals in here! */
.globl _start
_start:
/* 'reset' window registers */
movi a4, 1
wsr a4, PS
rsync
rsr a5, WINDOWBASE
ssl a5
sll a4, a4
wsr a4, WINDOWSTART
rsync
movi a4, 0x00040000
wsr a4, PS
rsync
/* copy the loader to its address
* Note: The loader itself is a very small piece, so we assume we
* don't partially overlap. We also assume (even more important)
* that the kernel image is out of the way. Usually, when the
* load address of this image is not at an arbitrary address,
* but aligned to some 10K's we shouldn't overlap.
*/
/* Note: The assembler cannot relax "addi a0, a0, ..." to an
l32r, so we load to a4 first. */
addi a4, a0, __start - __start_a0
mov a0, a4
movi a4, __start
movi a5, __reloc_end
# a0: address where this code has been loaded
# a4: compiled address of __start
# a5: compiled end address
mov.n a7, a0
mov.n a8, a4
1:
l32i a10, a7, 0
l32i a11, a7, 4
s32i a10, a8, 0
s32i a11, a8, 4
l32i a10, a7, 8
l32i a11, a7, 12
s32i a10, a8, 8
s32i a11, a8, 12
addi a8, a8, 16
addi a7, a7, 16
blt a8, a5, 1b
/* We have to flush and invalidate the caches here before we jump. */
#if XCHAL_DCACHE_IS_WRITEBACK
dcache_writeback_all a5, a6
#endif
icache_invalidate_all a5, a6
movi a11, _reloc
jx a11
.globl _reloc
_reloc:
/* RedBoot is now at the end of the memory, so we don't have
* to copy the parameter list. Keep the code around; in case
* we need it again. */
#if 0
# a0: load address
# a2: start address of parameter list
# a3: length of parameter list
# a4: __start
/* copy the parameter list out of the way */
movi a6, _param_start
add a3, a2, a3
2:
l32i a8, a2, 0
s32i a8, a6, 0
addi a2, a2, 4
addi a6, a6, 4
blt a2, a3, 2b
#endif
/* clear BSS section */
movi a6, __bss_start
movi a7, __bss_end
movi.n a5, 0
3:
s32i a5, a6, 0
addi a6, a6, 4
blt a6, a7, 3b
movi a5, -16
movi a1, _stack + STACK_SIZE
and a1, a1, a5
/* Uncompress the kernel */
# a0: load address
# a2: boot parameter
# a4: __start
movi a3, __image_load
sub a4, a3, a4
add a8, a0, a4
# a1 Stack
# a8(a4) Load address of the image
movi a6, _image_start
movi a10, _image_end
movi a7, 0x1000000
sub a11, a10, a6
movi a9, complen
s32i a11, a9, 0
movi a0, 0
# a6 destination
# a7 maximum size of destination
# a8 source
# a9 ptr to length
.extern gunzip
movi a4, gunzip
beqz a4, 1f
callx4 a4
j 2f
# a6 destination start
# a7 maximum size of destination
# a8 source start
# a9 ptr to length
# a10 destination end
1:
l32i a9, a8, 0
l32i a11, a8, 4
s32i a9, a6, 0
s32i a11, a6, 4
l32i a9, a8, 8
l32i a11, a8, 12
s32i a9, a6, 8
s32i a11, a6, 12
addi a6, a6, 16
addi a8, a8, 16
blt a6, a10, 1b
/* jump to the kernel */
2:
#if XCHAL_DCACHE_IS_WRITEBACK
dcache_writeback_all a5, a6
#endif
icache_invalidate_all a5, a6
movi a5, __start
movi a3, boot_initrd_start
movi a4, boot_initrd_end
sub a3, a3, a5
sub a4, a4, a5
add a3, a0, a3
add a4, a0, a4
# a2 Boot parameter list
# a3 initrd_start (virtual load address)
# a4 initrd_end (virtual load address)
movi a0, _image_start
jx a0
.align 16
.data
.globl avail_ram
avail_ram:
.long _heap
.globl end_avail
end_avail:
.long _heap + HEAP_SIZE
.comm _stack, STACK_SIZE
.comm _heap, HEAP_SIZE
.globl end_avail
.comm complen, 4
.end literal_prefix
/*
* BK Id: SCCS/s.zlib.h 1.8 05/18/01 15:17:23 cort
*/
/*
* This file is derived from zlib.h and zconf.h from the zlib-0.95
* distribution by Jean-loup Gailly and Mark Adler, with some additions
* by Paul Mackerras to aid in implementing Deflate compression and
* decompression for PPP packets.
*/
/*
* ==FILEVERSION 960122==
*
* This marker is used by the Linux installation script to determine
* whether an up-to-date version of this file is already installed.
*/
/* zlib.h -- interface of the 'zlib' general purpose compression library
version 0.95, Aug 16th, 1995.
Copyright (C) 1995 Jean-loup Gailly and Mark Adler
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
Jean-loup Gailly Mark Adler
gzip@prep.ai.mit.edu madler@alumni.caltech.edu
*/
#ifndef _ZLIB_H
#define _ZLIB_H
/* #include "zconf.h" */ /* included directly here */
/* zconf.h -- configuration of the zlib compression library
* Copyright (C) 1995 Jean-loup Gailly.
* For conditions of distribution and use, see copyright notice in zlib.h
*/
/* From: zconf.h,v 1.12 1995/05/03 17:27:12 jloup Exp */
/*
The library does not install any signal handler. It is recommended to
add at least a handler for SIGSEGV when decompressing; the library checks
the consistency of the input data whenever possible but may go nuts
for some forms of corrupted input.
*/
/*
* Compile with -DMAXSEG_64K if the alloc function cannot allocate more
* than 64k bytes at a time (needed on systems with 16-bit int).
* Compile with -DUNALIGNED_OK if it is OK to access shorts or ints
* at addresses which are not a multiple of their size.
* Under DOS, -DFAR=far or -DFAR=__far may be needed.
*/