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OpenCloudOS-Kernel/arch/mips/kernel/entry.S

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Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
/*
* 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 - 2000, 2001, 2003 Ralf Baechle
* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
* Copyright (C) 2001 MIPS Technologies, Inc.
*/
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/regdef.h>
#include <asm/mipsregs.h>
#include <asm/stackframe.h>
#include <asm/isadep.h>
#include <asm/thread_info.h>
#include <asm/war.h>
[MIPS] MT: Improved multithreading support. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-04-05 16:45:45 +08:00
#ifdef CONFIG_MIPS_MT_SMTC
#include <asm/mipsmtregs.h>
#endif
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
[MIPS] ret_from_irq adjustment Make sure that RA on top of interrupt stack is an address of ret_from_irq, so that dump_stack etc. can trace info interrupted context. Also this patch fixes except_vec_vi_handler and __smtc_ipi_vector which seems broken. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-10-09 00:24:23 +08:00
#ifndef CONFIG_PREEMPT
Remove unused arguments from preempt_{start,stop}/local_irq_{en,dis}able. Don't clobber the preloaded TI_FLAGS in a2 needlessly. Unexport local functions. Signed-off-by: Thiemo Seufer <ths@networkno.de> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2004-12-10 20:56:33 +08:00
.macro preempt_stop
local_irq_disable
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
.endm
#define resume_kernel restore_all
#endif
.text
.align 5
[MIPS] ret_from_irq adjustment Make sure that RA on top of interrupt stack is an address of ret_from_irq, so that dump_stack etc. can trace info interrupted context. Also this patch fixes except_vec_vi_handler and __smtc_ipi_vector which seems broken. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-10-09 00:24:23 +08:00
FEXPORT(ret_from_irq)
LONG_S s0, TI_REGS($28)
#ifdef CONFIG_PREEMPT
FEXPORT(ret_from_exception)
#else
b _ret_from_irq
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
FEXPORT(ret_from_exception)
preempt_stop
[MIPS] ret_from_irq adjustment Make sure that RA on top of interrupt stack is an address of ret_from_irq, so that dump_stack etc. can trace info interrupted context. Also this patch fixes except_vec_vi_handler and __smtc_ipi_vector which seems broken. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-10-09 00:24:23 +08:00
#endif
FEXPORT(_ret_from_irq)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
LONG_L t0, PT_STATUS(sp) # returning to kernel mode?
andi t0, t0, KU_USER
beqz t0, resume_kernel
Remove unused arguments from preempt_{start,stop}/local_irq_{en,dis}able. Don't clobber the preloaded TI_FLAGS in a2 needlessly. Unexport local functions. Signed-off-by: Thiemo Seufer <ths@networkno.de> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2004-12-10 20:56:33 +08:00
resume_userspace:
local_irq_disable # make sure we dont miss an
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
# interrupt setting need_resched
# between sampling and return
LONG_L a2, TI_FLAGS($28) # current->work
Remove unused arguments from preempt_{start,stop}/local_irq_{en,dis}able. Don't clobber the preloaded TI_FLAGS in a2 needlessly. Unexport local functions. Signed-off-by: Thiemo Seufer <ths@networkno.de> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2004-12-10 20:56:33 +08:00
andi t0, a2, _TIF_WORK_MASK # (ignoring syscall_trace)
bnez t0, work_pending
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
j restore_all
#ifdef CONFIG_PREEMPT
Remove unused arguments from preempt_{start,stop}/local_irq_{en,dis}able. Don't clobber the preloaded TI_FLAGS in a2 needlessly. Unexport local functions. Signed-off-by: Thiemo Seufer <ths@networkno.de> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2004-12-10 20:56:33 +08:00
resume_kernel:
Use preempt_schedule_irq. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2005-02-07 10:54:29 +08:00
local_irq_disable
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
lw t0, TI_PRE_COUNT($28)
bnez t0, restore_all
need_resched:
LONG_L t0, TI_FLAGS($28)
andi t1, t0, _TIF_NEED_RESCHED
beqz t1, restore_all
LONG_L t0, PT_STATUS(sp) # Interrupts off?
andi t0, 1
beqz t0, restore_all
Use preempt_schedule_irq. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2005-02-07 10:54:29 +08:00
jal preempt_schedule_irq
Fix preemption bug. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2005-03-04 20:35:42 +08:00
b need_resched
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
#endif
FEXPORT(ret_from_fork)
[PATCH] sched: cleanup, remove task_t, convert to struct task_struct cleanup: remove task_t and convert all the uses to struct task_struct. I introduced it for the scheduler anno and it was a mistake. Conversion was mostly scripted, the result was reviewed and all secondary whitespace and style impact (if any) was fixed up by hand. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-07-03 15:25:41 +08:00
jal schedule_tail # a0 = struct task_struct *prev
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
FEXPORT(syscall_exit)
local_irq_disable # make sure need_resched and
# signals dont change between
# sampling and return
LONG_L a2, TI_FLAGS($28) # current->work
li t0, _TIF_ALLWORK_MASK
and t0, a2, t0
bnez t0, syscall_exit_work
FEXPORT(restore_all) # restore full frame
[MIPS] MT: Improved multithreading support. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-04-05 16:45:45 +08:00
#ifdef CONFIG_MIPS_MT_SMTC
/* Detect and execute deferred IPI "interrupts" */
[MIPS] SMTC: Fix crash if # of TC's > # of VPE's after pt_regs irq cleanup. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-11-01 06:49:04 +08:00
LONG_L s0, TI_REGS($28)
LONG_S sp, TI_REGS($28)
[MIPS] MT: Improved multithreading support. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-04-05 16:45:45 +08:00
jal deferred_smtc_ipi
[MIPS] SMTC: Fix crash if # of TC's > # of VPE's after pt_regs irq cleanup. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-11-01 06:49:04 +08:00
LONG_S s0, TI_REGS($28)
[MIPS] MT: Improved multithreading support. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-04-05 16:45:45 +08:00
/* Re-arm any temporarily masked interrupts not explicitly "acked" */
mfc0 v0, CP0_TCSTATUS
ori v1, v0, TCSTATUS_IXMT
mtc0 v1, CP0_TCSTATUS
andi v0, TCSTATUS_IXMT
[MIPS] Fix use of ehb instruction for non-R2 configurations. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-06-04 05:40:15 +08:00
_ehb
[MIPS] MT: Improved multithreading support. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-04-05 16:45:45 +08:00
mfc0 t0, CP0_TCCONTEXT
DMT 9 # dmt t1
jal mips_ihb
mfc0 t2, CP0_STATUS
andi t3, t0, 0xff00
or t2, t2, t3
mtc0 t2, CP0_STATUS
[MIPS] Fix use of ehb instruction for non-R2 configurations. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-06-04 05:40:15 +08:00
_ehb
[MIPS] MT: Improved multithreading support. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-04-05 16:45:45 +08:00
andi t1, t1, VPECONTROL_TE
beqz t1, 1f
EMT
1:
mfc0 v1, CP0_TCSTATUS
[MIPS] Fix typo Found by Chris Dearman (chris@mips.com). Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-04-27 22:44:50 +08:00
/* We set IXMT above, XOR should clear it here */
[MIPS] MT: Improved multithreading support. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-04-05 16:45:45 +08:00
xori v1, v1, TCSTATUS_IXMT
or v1, v0, v1
mtc0 v1, CP0_TCSTATUS
[MIPS] Fix use of ehb instruction for non-R2 configurations. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-06-04 05:40:15 +08:00
_ehb
[MIPS] MT: Improved multithreading support. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-04-05 16:45:45 +08:00
xor t0, t0, t3
mtc0 t0, CP0_TCCONTEXT
#endif /* CONFIG_MIPS_MT_SMTC */
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
.set noat
RESTORE_TEMP
RESTORE_AT
RESTORE_STATIC
FEXPORT(restore_partial) # restore partial frame
[MIPS] TRACE_IRQFLAGS_SUPPORT support. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-07-07 21:07:18 +08:00
#ifdef CONFIG_TRACE_IRQFLAGS
SAVE_STATIC
SAVE_AT
SAVE_TEMP
LONG_L v0, PT_STATUS(sp)
and v0, 1
beqz v0, 1f
jal trace_hardirqs_on
b 2f
1: jal trace_hardirqs_off
2:
RESTORE_TEMP
RESTORE_AT
RESTORE_STATIC
#endif
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
RESTORE_SOME
RESTORE_SP_AND_RET
.set at
Remove unused arguments from preempt_{start,stop}/local_irq_{en,dis}able. Don't clobber the preloaded TI_FLAGS in a2 needlessly. Unexport local functions. Signed-off-by: Thiemo Seufer <ths@networkno.de> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2004-12-10 20:56:33 +08:00
work_pending:
andi t0, a2, _TIF_NEED_RESCHED # a2 is preloaded with TI_FLAGS
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
beqz t0, work_notifysig
work_resched:
jal schedule
Remove unused arguments from preempt_{start,stop}/local_irq_{en,dis}able. Don't clobber the preloaded TI_FLAGS in a2 needlessly. Unexport local functions. Signed-off-by: Thiemo Seufer <ths@networkno.de> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2004-12-10 20:56:33 +08:00
local_irq_disable # make sure need_resched and
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
# signals dont change between
# sampling and return
LONG_L a2, TI_FLAGS($28)
andi t0, a2, _TIF_WORK_MASK # is there any work to be done
# other than syscall tracing?
beqz t0, restore_all
andi t0, a2, _TIF_NEED_RESCHED
bnez t0, work_resched
work_notifysig: # deal with pending signals and
# notify-resume requests
move a0, sp
li a1, 0
jal do_notify_resume # a2 already loaded
Fix excessive signal latencies. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2005-09-16 00:43:50 +08:00
j resume_userspace
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
FEXPORT(syscall_exit_work_partial)
SAVE_STATIC
Remove unused arguments from preempt_{start,stop}/local_irq_{en,dis}able. Don't clobber the preloaded TI_FLAGS in a2 needlessly. Unexport local functions. Signed-off-by: Thiemo Seufer <ths@networkno.de> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2004-12-10 20:56:33 +08:00
syscall_exit_work:
li t0, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT
and t0, a2 # a2 is preloaded with TI_FLAGS
beqz t0, work_pending # trace bit set?
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 06:20:36 +08:00
local_irq_enable # could let do_syscall_trace()
# call schedule() instead
move a0, sp
li a1, 1
jal do_syscall_trace
b resume_userspace
[MIPS] R2: Instruction hazard barrier. Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2006-04-05 16:45:45 +08:00
#if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_MIPS_MT)
/*
* MIPS32R2 Instruction Hazard Barrier - must be called
*
* For C code use the inline version named instruction_hazard().
*/
LEAF(mips_ihb)
.set mips32r2
jr.hb ra
nop
END(mips_ihb)
#endif /* CONFIG_CPU_MIPSR2 or CONFIG_MIPS_MT */