155 lines
3.8 KiB
ArmAsm
155 lines
3.8 KiB
ArmAsm
|
/*
|
||
|
|
* 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) 1994 - 99, 2003, 06 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.
|
||
|
|
* Kevin Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
|
||
|
|
* Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
|
||
|
|
*/
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/threads.h>
|
||
|
|
|
||
|
|
#include <asm/addrspace.h>
|
||
|
|
#include <asm/asm.h>
|
||
|
|
#include <asm/asmmacro.h>
|
||
|
|
#include <asm/irqflags.h>
|
||
|
|
#include <asm/regdef.h>
|
||
|
|
#include <asm/mipsregs.h>
|
||
|
|
#include <asm/stackframe.h>
|
||
|
|
|
||
|
|
#include <kernel-entry-init.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* For the moment disable interrupts, mark the kernel mode and
|
||
|
|
* set ST0_KX so that the CPU does not spit fire when using
|
||
|
|
* 64-bit addresses. A full initialization of the CPU's status
|
||
|
|
* register is done later in per_cpu_trap_init().
|
||
|
|
*/
|
||
|
|
.macro setup_c0_status set clr
|
||
|
|
.set push
|
||
|
|
mfc0 t0, CP0_STATUS
|
||
|
|
or t0, ST0_KERNEL_CUMASK|\set|0x1f|\clr
|
||
|
|
xor t0, 0x1f|\clr
|
||
|
|
mtc0 t0, CP0_STATUS
|
||
|
|
.set noreorder
|
||
|
|
sll zero,3 # ehb
|
||
|
|
.set pop
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro setup_c0_status_pri
|
||
|
|
#ifdef CONFIG_64BIT
|
||
|
|
setup_c0_status ST0_KX 0
|
||
|
|
#else
|
||
|
|
setup_c0_status 0 0
|
||
|
|
#endif
|
||
|
|
.endm
|
||
|
|
|
||
|
|
.macro setup_c0_status_sec
|
||
|
|
#ifdef CONFIG_64BIT
|
||
|
|
setup_c0_status ST0_KX ST0_BEV
|
||
|
|
#else
|
||
|
|
setup_c0_status 0 ST0_BEV
|
||
|
|
#endif
|
||
|
|
.endm
|
||
|
|
|
||
|
|
#ifndef CONFIG_NO_EXCEPT_FILL
|
||
|
|
/*
|
||
|
|
* Reserved space for exception handlers.
|
||
|
|
* Necessary for machines which link their kernels at KSEG0.
|
||
|
|
*/
|
||
|
|
.fill 0x400
|
||
|
|
#endif
|
||
|
|
|
||
|
|
EXPORT(_stext)
|
||
|
|
|
||
|
|
#ifdef CONFIG_BOOT_RAW
|
||
|
|
/*
|
||
|
|
* Give us a fighting chance of running if execution beings at the
|
||
|
|
* kernel load address. This is needed because this platform does
|
||
|
|
* not have a ELF loader yet.
|
||
|
|
*/
|
||
|
|
FEXPORT(__kernel_entry)
|
||
|
|
j kernel_entry
|
||
|
|
#endif /* CONFIG_BOOT_RAW */
|
||
|
|
|
||
|
|
__REF
|
||
|
|
|
||
|
|
NESTED(kernel_entry, 16, sp) # kernel entry point
|
||
|
|
|
||
|
|
kernel_entry_setup # cpu specific setup
|
||
|
|
|
||
|
|
setup_c0_status_pri
|
||
|
|
|
||
|
|
/* We might not get launched at the address the kernel is linked to,
|
||
|
|
so we jump there. */
|
||
|
|
PTR_LA t0, 0f
|
||
|
|
jr t0
|
||
|
|
0:
|
||
|
|
|
||
|
|
PTR_LA t0, __bss_start # clear .bss
|
||
|
|
LONG_S zero, (t0)
|
||
|
|
PTR_LA t1, __bss_stop - LONGSIZE
|
||
|
|
1:
|
||
|
|
PTR_ADDIU t0, LONGSIZE
|
||
|
|
LONG_S zero, (t0)
|
||
|
|
bne t0, t1, 1b
|
||
|
|
|
||
|
|
LONG_S a0, fw_arg0 # firmware arguments
|
||
|
|
LONG_S a1, fw_arg1
|
||
|
|
LONG_S a2, fw_arg2
|
||
|
|
LONG_S a3, fw_arg3
|
||
|
|
|
||
|
|
MTC0 zero, CP0_CONTEXT # clear context register
|
||
|
|
#ifdef CONFIG_64BIT
|
||
|
|
MTC0 zero, CP0_XCONTEXT
|
||
|
|
#endif
|
||
|
|
PTR_LA $28, init_thread_union
|
||
|
|
/* Set the SP after an empty pt_regs. */
|
||
|
|
PTR_LI sp, _THREAD_SIZE - 32 - PT_SIZE
|
||
|
|
PTR_ADDU sp, $28
|
||
|
|
back_to_back_c0_hazard
|
||
|
|
set_saved_sp sp, t0, t1
|
||
|
|
PTR_SUBU sp, 4 * SZREG # init stack pointer
|
||
|
|
|
||
|
|
#ifdef CONFIG_RELOCATABLE
|
||
|
|
/* Copy kernel and apply the relocations */
|
||
|
|
jal relocate_kernel
|
||
|
|
|
||
|
|
/* Repoint the sp into the new kernel image */
|
||
|
|
PTR_LI sp, _THREAD_SIZE - 32 - PT_SIZE
|
||
|
|
PTR_ADDU sp, $28
|
||
|
|
set_saved_sp sp, t0, t1
|
||
|
|
PTR_SUBU sp, 4 * SZREG # init stack pointer
|
||
|
|
|
||
|
|
/*
|
||
|
|
* relocate_kernel returns the entry point either
|
||
|
|
* in the relocated kernel or the original if for
|
||
|
|
* some reason relocation failed - jump there now
|
||
|
|
* with instruction hazard barrier because of the
|
||
|
|
* newly sync'd icache.
|
||
|
|
*/
|
||
|
|
jr.hb v0
|
||
|
|
#else /* !CONFIG_RELOCATABLE */
|
||
|
|
j start_kernel
|
||
|
|
#endif /* !CONFIG_RELOCATABLE */
|
||
|
|
END(kernel_entry)
|
||
|
|
|
||
|
|
#ifdef CONFIG_SMP
|
||
|
|
/*
|
||
|
|
* SMP slave cpus entry point. Board specific code for bootstrap calls this
|
||
|
|
* function after setting up the stack and gp registers.
|
||
|
|
*/
|
||
|
|
NESTED(smp_bootstrap, 16, sp)
|
||
|
|
smp_slave_setup
|
||
|
|
setup_c0_status_sec
|
||
|
|
j start_secondary
|
||
|
|
END(smp_bootstrap)
|
||
|
|
#endif /* CONFIG_SMP */
|