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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157/* * 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
__HEAD
#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 t00:
PTR_LA t0, __bss_start # clear .bss LONG_S zero, (t0) PTR_LA t1, __bss_stop - LONGSIZE1: 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 */