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/* $Id: head.S,v 1.6 2000/03/27 21:05:04 ulfc Exp $
*
* 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.
*
* Head.S contains the MIPS exception handler and startup code.
*
* Copyright (C) 1994, 1995 Waldorf Electronics
* Written by Ralf Baechle and Andreas Busse
* Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999 Ralf Baechle
* Copyright (C) 1999 Silicon Graphics, Inc.
*/
#define __ASSEMBLY__
#include <linux/config.h>
#include <linux/init.h>
#include <asm/asm.h>
#include <asm/regdef.h>
#include <asm/processor.h>
#include <asm/mipsregs.h>
#include <asm/stackframe.h>
#define ARC64_TWIDDLE_PC \
#ifdef CONFIG_ARC64 \
/* We get launched at a XKPHYS address but the kernel is linked to \
run at a KSEG0 address, so jump there. */ \
la t0, 1f \
jr t0 \
1: \
#endif
.text
EXPORT(stext) # used for profiling
EXPORT(_stext)
__INIT
NESTED(kernel_entry, 16, sp) # kernel entry point
ARC64_TWIDDLE_PC
ori sp, 0xf # align stack on 16 byte.
xori sp, 0xf
/* Note that all firmware passed argument registers still
have their values. */
jal prom_init # initialize firmware
CLI # disable interrupts
mfc0 t0, CP0_STATUS
/*
* On IP27, I am seeing the TS bit set when the
* kernel is loaded. Maybe because the kernel is
* in ckseg0 and not xkphys? Clear it anyway ...
*/
li t1, ~(ST0_TS|ST0_CU1|ST0_CU2|ST0_CU3)
and t0, t1
or t0, (ST0_CU0|ST0_KX|ST0_SX|ST0_FR) # Bogosity: cu0 indicates kernel
mtc0 t0, CP0_STATUS # thread in copy_thread.
la $28, init_task_union # init current pointer
daddiu t0, $28, KERNEL_STACK_SIZE-32
sd t0, kernelsp
dsubu sp, t0, 4*SZREG # init stack pointer
jal start_kernel
1: b 1b # just in case ...
END(kernel_entry)
NESTED(bootstrap, 16, sp)
ARC64_TWIDDLE_PC
CLI
mfc0 t0, CP0_STATUS
li t1, ~(ST0_CU1|ST0_CU2|ST0_CU3)
and t0, t1
or t0, (ST0_CU0|ST0_KX|ST0_SX|ST0_FR) # Bogosity: cu0 indicates kernel
mtc0 t0, CP0_STATUS # thread in copy_thread.
jal cboot
END(bootstrap)
__FINIT
.comm kernelsp, 8, 8 # current stackpointer
#define PAGE_SIZE 0x1000
.macro page name, order=0
.globl \name
.org . + (PAGE_SIZE << \order)
\name: .size \name, (PAGE_SIZE << \order)
.type \name, @object
.endm
.align 12
.data
page swapper_pg_dir, 1
page invalid_pte_table, 1
page invalid_pmd_table, 1
page empty_bad_page_table, 1
page empty_bad_page
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