1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1994, 95, 96, 97, 98, 99, 2003 by Ralf Baechle 7 * Copyright (C) 1996 by Paul M. Antoine 8 * Copyright (C) 1999 Silicon Graphics 9 * Copyright (C) 2000 MIPS Technologies, Inc. 10 */ 11 #ifndef _ASM_IRQFLAGS_H 12 #define _ASM_IRQFLAGS_H 13 14 #ifndef __ASSEMBLY__ 15 16 #include <linux/compiler.h> 17 #include <linux/stringify.h> 18 #include <asm/compiler.h> 19 #include <asm/hazards.h> 20 21 #if defined(CONFIG_CPU_MIPSR2) || defined (CONFIG_CPU_MIPSR6) 22 23 static inline void arch_local_irq_disable(void) 24 { 25 __asm__ __volatile__( 26 " .set push \n" 27 " .set noat \n" 28 " di \n" 29 " " __stringify(__irq_disable_hazard) " \n" 30 " .set pop \n" 31 : /* no outputs */ 32 : /* no inputs */ 33 : "memory"); 34 } 35 36 static inline unsigned long arch_local_irq_save(void) 37 { 38 unsigned long flags; 39 40 asm __volatile__( 41 " .set push \n" 42 " .set reorder \n" 43 " .set noat \n" 44 " di %[flags] \n" 45 " andi %[flags], 1 \n" 46 " " __stringify(__irq_disable_hazard) " \n" 47 " .set pop \n" 48 : [flags] "=r" (flags) 49 : /* no inputs */ 50 : "memory"); 51 52 return flags; 53 } 54 55 static inline void arch_local_irq_restore(unsigned long flags) 56 { 57 unsigned long __tmp1; 58 59 __asm__ __volatile__( 60 " .set push \n" 61 " .set noreorder \n" 62 " .set noat \n" 63 #if defined(CONFIG_IRQ_MIPS_CPU) 64 /* 65 * Slow, but doesn't suffer from a relatively unlikely race 66 * condition we're having since days 1. 67 */ 68 " beqz %[flags], 1f \n" 69 " di \n" 70 " ei \n" 71 "1: \n" 72 #else 73 /* 74 * Fast, dangerous. Life is fun, life is good. 75 */ 76 " mfc0 $1, $12 \n" 77 " ins $1, %[flags], 0, 1 \n" 78 " mtc0 $1, $12 \n" 79 #endif 80 " " __stringify(__irq_disable_hazard) " \n" 81 " .set pop \n" 82 : [flags] "=r" (__tmp1) 83 : "0" (flags) 84 : "memory"); 85 } 86 87 #else 88 /* Functions that require preempt_{dis,en}able() are in mips-atomic.c */ 89 void arch_local_irq_disable(void); 90 unsigned long arch_local_irq_save(void); 91 void arch_local_irq_restore(unsigned long flags); 92 #endif /* CONFIG_CPU_MIPSR2 || CONFIG_CPU_MIPSR6 */ 93 94 static inline void arch_local_irq_enable(void) 95 { 96 __asm__ __volatile__( 97 " .set push \n" 98 " .set reorder \n" 99 " .set noat \n" 100 #if defined(CONFIG_CPU_MIPSR2) || defined(CONFIG_CPU_MIPSR6) 101 " ei \n" 102 #else 103 " mfc0 $1,$12 \n" 104 " ori $1,0x1f \n" 105 " xori $1,0x1e \n" 106 " mtc0 $1,$12 \n" 107 #endif 108 " " __stringify(__irq_enable_hazard) " \n" 109 " .set pop \n" 110 : /* no outputs */ 111 : /* no inputs */ 112 : "memory"); 113 } 114 115 static inline unsigned long arch_local_save_flags(void) 116 { 117 unsigned long flags; 118 119 asm __volatile__( 120 " .set push \n" 121 " .set reorder \n" 122 " mfc0 %[flags], $12 \n" 123 " .set pop \n" 124 : [flags] "=r" (flags)); 125 126 return flags; 127 } 128 129 130 static inline int arch_irqs_disabled_flags(unsigned long flags) 131 { 132 return !(flags & 1); 133 } 134 135 #endif /* #ifndef __ASSEMBLY__ */ 136 137 /* 138 * Do the CPU's IRQ-state tracing from assembly code. 139 */ 140 #ifdef CONFIG_TRACE_IRQFLAGS 141 /* Reload some registers clobbered by trace_hardirqs_on */ 142 #ifdef CONFIG_64BIT 143 # define TRACE_IRQS_RELOAD_REGS \ 144 LONG_L $11, PT_R11(sp); \ 145 LONG_L $10, PT_R10(sp); \ 146 LONG_L $9, PT_R9(sp); \ 147 LONG_L $8, PT_R8(sp); \ 148 LONG_L $7, PT_R7(sp); \ 149 LONG_L $6, PT_R6(sp); \ 150 LONG_L $5, PT_R5(sp); \ 151 LONG_L $4, PT_R4(sp); \ 152 LONG_L $2, PT_R2(sp) 153 #else 154 # define TRACE_IRQS_RELOAD_REGS \ 155 LONG_L $7, PT_R7(sp); \ 156 LONG_L $6, PT_R6(sp); \ 157 LONG_L $5, PT_R5(sp); \ 158 LONG_L $4, PT_R4(sp); \ 159 LONG_L $2, PT_R2(sp) 160 #endif 161 # define TRACE_IRQS_ON \ 162 CLI; /* make sure trace_hardirqs_on() is called in kernel level */ \ 163 jal trace_hardirqs_on 164 # define TRACE_IRQS_ON_RELOAD \ 165 TRACE_IRQS_ON; \ 166 TRACE_IRQS_RELOAD_REGS 167 # define TRACE_IRQS_OFF \ 168 jal trace_hardirqs_off 169 #else 170 # define TRACE_IRQS_ON 171 # define TRACE_IRQS_ON_RELOAD 172 # define TRACE_IRQS_OFF 173 #endif 174 175 #endif /* _ASM_IRQFLAGS_H */ 176