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113 lines
2.7 KiB
113 lines
2.7 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 1994, 95, 96, 97, 98, 99, 2003 by Ralf Baechle |
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* Copyright (C) 1996 by Paul M. Antoine |
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* Copyright (C) 1999 Silicon Graphics |
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* Copyright (C) 2000 MIPS Technologies, Inc. |
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*/ |
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#include <asm/irqflags.h> |
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#include <asm/hazards.h> |
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#include <linux/compiler.h> |
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#include <linux/preempt.h> |
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#include <linux/export.h> |
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#include <linux/stringify.h> |
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#if !defined(CONFIG_CPU_HAS_DIEI) |
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/* |
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* For cli() we have to insert nops to make sure that the new value |
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* has actually arrived in the status register before the end of this |
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* macro. |
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* R4000/R4400 need three nops, the R4600 two nops and the R10000 needs |
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* no nops at all. |
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*/ |
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/* |
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* For TX49, operating only IE bit is not enough. |
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* |
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* If mfc0 $12 follows store and the mfc0 is last instruction of a |
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* page and fetching the next instruction causes TLB miss, the result |
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* of the mfc0 might wrongly contain EXL bit. |
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* |
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* ERT-TX49H2-027, ERT-TX49H3-012, ERT-TX49HL3-006, ERT-TX49H4-008 |
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* |
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* Workaround: mask EXL bit of the result or place a nop before mfc0. |
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*/ |
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notrace void arch_local_irq_disable(void) |
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{ |
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preempt_disable_notrace(); |
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__asm__ __volatile__( |
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" .set push \n" |
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" .set noat \n" |
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" mfc0 $1,$12 \n" |
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" ori $1,0x1f \n" |
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" xori $1,0x1f \n" |
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" .set noreorder \n" |
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" mtc0 $1,$12 \n" |
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" " __stringify(__irq_disable_hazard) " \n" |
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" .set pop \n" |
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: /* no outputs */ |
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: /* no inputs */ |
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: "memory"); |
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preempt_enable_notrace(); |
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} |
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EXPORT_SYMBOL(arch_local_irq_disable); |
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notrace unsigned long arch_local_irq_save(void) |
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{ |
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unsigned long flags; |
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preempt_disable_notrace(); |
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__asm__ __volatile__( |
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" .set push \n" |
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" .set reorder \n" |
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" .set noat \n" |
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" mfc0 %[flags], $12 \n" |
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" ori $1, %[flags], 0x1f \n" |
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" xori $1, 0x1f \n" |
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" .set noreorder \n" |
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" mtc0 $1, $12 \n" |
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" " __stringify(__irq_disable_hazard) " \n" |
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" .set pop \n" |
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: [flags] "=r" (flags) |
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: /* no inputs */ |
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: "memory"); |
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preempt_enable_notrace(); |
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return flags; |
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} |
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EXPORT_SYMBOL(arch_local_irq_save); |
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notrace void arch_local_irq_restore(unsigned long flags) |
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{ |
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unsigned long __tmp1; |
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preempt_disable_notrace(); |
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__asm__ __volatile__( |
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" .set push \n" |
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" .set noreorder \n" |
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" .set noat \n" |
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" mfc0 $1, $12 \n" |
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" andi %[flags], 1 \n" |
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" ori $1, 0x1f \n" |
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" xori $1, 0x1f \n" |
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" or %[flags], $1 \n" |
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" mtc0 %[flags], $12 \n" |
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" " __stringify(__irq_disable_hazard) " \n" |
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" .set pop \n" |
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: [flags] "=r" (__tmp1) |
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: "0" (flags) |
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: "memory"); |
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preempt_enable_notrace(); |
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} |
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EXPORT_SYMBOL(arch_local_irq_restore); |
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#endif /* !CONFIG_CPU_HAS_DIEI */
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