/*
 * 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, 95, 96, 97, 98, 99, 2003 by Ralf Baechle
 * Copyright (C) 1996 by Paul M. Antoine
 * Copyright (C) 1999 Silicon Graphics
 * Copyright (C) 2000 MIPS Technologies, Inc.
 */
#include <asm/irqflags.h>
#include <asm/hazards.h>
#include <linux/compiler.h>
#include <linux/preempt.h>
#include <linux/export.h>
#include <linux/stringify.h>

#if !defined(CONFIG_CPU_HAS_DIEI)

/*
 * For cli() we have to insert nops to make sure that the new value
 * has actually arrived in the status register before the end of this
 * macro.
 * R4000/R4400 need three nops, the R4600 two nops and the R10000 needs
 * no nops at all.
 */
/*
 * For TX49, operating only IE bit is not enough.
 *
 * If mfc0 $12 follows store and the mfc0 is last instruction of a
 * page and fetching the next instruction causes TLB miss, the result
 * of the mfc0 might wrongly contain EXL bit.
 *
 * ERT-TX49H2-027, ERT-TX49H3-012, ERT-TX49HL3-006, ERT-TX49H4-008
 *
 * Workaround: mask EXL bit of the result or place a nop before mfc0.
 */
notrace void arch_local_irq_disable(void)
{
        preempt_disable_notrace();

        __asm__ __volatile__(
        "       .set    push                                            \n"
        "       .set    noat                                            \n"
        "       mfc0    $1,$12                                          \n"
        "       ori     $1,0x1f                                         \n"
        "       xori    $1,0x1f                                         \n"
        "       .set    noreorder                                       \n"
        "       mtc0    $1,$12                                          \n"
        "       " __stringify(__irq_disable_hazard) "                   \n"
        "       .set    pop                                             \n"
        : /* no outputs */
        : /* no inputs */
        : "memory");

        preempt_enable_notrace();
}
EXPORT_SYMBOL(arch_local_irq_disable);

notrace unsigned long arch_local_irq_save(void)
{
        unsigned long flags;

        preempt_disable_notrace();

        __asm__ __volatile__(
        "       .set    push                                            \n"
        "       .set    reorder                                         \n"
        "       .set    noat                                            \n"
        "       mfc0    %[flags], $12                                   \n"
        "       ori     $1, %[flags], 0x1f                              \n"
        "       xori    $1, 0x1f                                        \n"
        "       .set    noreorder                                       \n"
        "       mtc0    $1, $12                                         \n"
        "       " __stringify(__irq_disable_hazard) "                   \n"
        "       .set    pop                                             \n"
        : [flags] "=r" (flags)
        : /* no inputs */
        : "memory");

        preempt_enable_notrace();

        return flags;
}
EXPORT_SYMBOL(arch_local_irq_save);

notrace void arch_local_irq_restore(unsigned long flags)
{
        unsigned long __tmp1;

        preempt_disable_notrace();

        __asm__ __volatile__(
        "       .set    push                                            \n"
        "       .set    noreorder                                       \n"
        "       .set    noat                                            \n"
        "       mfc0    $1, $12                                         \n"
        "       andi    %[flags], 1                                     \n"
        "       ori     $1, 0x1f                                        \n"
        "       xori    $1, 0x1f                                        \n"
        "       or      %[flags], $1                                    \n"
        "       mtc0    %[flags], $12                                   \n"
        "       " __stringify(__irq_disable_hazard) "                   \n"
        "       .set    pop                                             \n"
        : [flags] "=r" (__tmp1)
        : "0" (flags)
        : "memory");

        preempt_enable_notrace();
}
EXPORT_SYMBOL(arch_local_irq_restore);

#endif /* !CONFIG_CPU_HAS_DIEI */