1 files changed, 155 insertions, 0 deletions

diff --git a/arch/mips/kernel/entry.S b/arch/mips/kernel/entry.S
new file mode 100644
index 000000000000..5eb429137e06
--- /dev/null
+++ b/arch/mips/kernel/entry.S
@@ -0,0 +1,155 @@
+/*
+ * 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 <linux/config.h>
+
+#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>
+
+#ifdef CONFIG_PREEMPT
+        .macro  preempt_stop reg=t0
+        .endm
+#else
+        .macro  preempt_stop reg=t0
+        local_irq_disable \reg
+        .endm
+#define resume_kernel   restore_all
+#endif
+
+        .text
+        .align  5
+FEXPORT(ret_from_exception)
+        preempt_stop
+FEXPORT(ret_from_irq)
+        LONG_L  t0, PT_STATUS(sp)               # returning to kernel mode?
+        andi    t0, t0, KU_USER
+        beqz    t0, resume_kernel
+
+FEXPORT(resume_userspace)
+        local_irq_disable       t0      # make sure we dont miss an
+                                        # interrupt setting need_resched
+                                        # between sampling and return
+        LONG_L  a2, TI_FLAGS($28)       # current->work
+        andi    a2, _TIF_WORK_MASK      # (ignoring syscall_trace)
+        bnez    a2, work_pending
+        j       restore_all
+
+#ifdef CONFIG_PREEMPT
+ENTRY(resume_kernel)
+        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
+        li      t0, PREEMPT_ACTIVE
+        sw      t0, TI_PRE_COUNT($28)
+        local_irq_enable t0
+        jal     schedule
+        sw      zero, TI_PRE_COUNT($28)
+        local_irq_disable t0
+        b       need_resched
+#endif
+
+FEXPORT(ret_from_fork)
+        jal     schedule_tail           # a0 = task_t *prev
+
+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
+        .set    noat
+        RESTORE_TEMP
+        RESTORE_AT
+        RESTORE_STATIC
+FEXPORT(restore_partial)                # restore partial frame
+        RESTORE_SOME
+        RESTORE_SP_AND_RET
+        .set    at
+
+FEXPORT(work_pending)
+        andi    t0, a2, _TIF_NEED_RESCHED
+        beqz    t0, work_notifysig
+work_resched:
+        jal     schedule
+
+        local_irq_disable t0            # make sure need_resched and
+                                        # 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
+        j       restore_all
+
+FEXPORT(syscall_exit_work_partial)
+        SAVE_STATIC
+FEXPORT(syscall_exit_work)
+        LONG_L  t0, TI_FLAGS($28)
+        li      t1, _TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT
+        and     t0, t1
+        beqz    t0, work_pending        # trace bit is set
+        local_irq_enable                # could let do_syscall_trace()
+                                        # call schedule() instead
+        move    a0, sp
+        li      a1, 1
+        jal     do_syscall_trace
+        b       resume_userspace
+
+/*
+ * Common spurious interrupt handler.
+ */
+        .text
+        .align  5
+LEAF(spurious_interrupt)
+        /*
+         * Someone tried to fool us by sending an interrupt but we
+         * couldn't find a cause for it.
+         */
+#ifdef CONFIG_SMP
+        lui     t1, %hi(irq_err_count)
+1:      ll      t0, %lo(irq_err_count)(t1)
+        addiu   t0, 1
+        sc      t0, %lo(irq_err_count)(t1)
+#if R10000_LLSC_WAR
+        beqzl   t0, 1b
+#else
+        beqz    t0, 1b
+#endif
+#else
+        lui     t1, %hi(irq_err_count)
+        lw      t0, %lo(irq_err_count)(t1)
+        addiu   t0, 1
+        sw      t0, %lo(irq_err_count)(t1)
+#endif
+        j       ret_from_irq
+        END(spurious_interrupt)