1 /* 2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 9 #ifndef __ASM_ARC_IRQFLAGS_H 10 #define __ASM_ARC_IRQFLAGS_H 11 12 /* vineetg: March 2010 : local_irq_save( ) optimisation 13 * -Remove explicit mov of current status32 into reg, that is not needed 14 * -Use BIC insn instead of INVERTED + AND 15 * -Conditionally disable interrupts (if they are not enabled, don't disable) 16 */ 17 18 #include <asm/arcregs.h> 19 20 /* status32 Reg bits related to Interrupt Handling */ 21 #define STATUS_E1_BIT 1 /* Int 1 enable */ 22 #define STATUS_E2_BIT 2 /* Int 2 enable */ 23 #define STATUS_A1_BIT 3 /* Int 1 active */ 24 #define STATUS_A2_BIT 4 /* Int 2 active */ 25 26 #define STATUS_E1_MASK (1<<STATUS_E1_BIT) 27 #define STATUS_E2_MASK (1<<STATUS_E2_BIT) 28 #define STATUS_A1_MASK (1<<STATUS_A1_BIT) 29 #define STATUS_A2_MASK (1<<STATUS_A2_BIT) 30 31 /* Other Interrupt Handling related Aux regs */ 32 #define AUX_IRQ_LEV 0x200 /* IRQ Priority: L1 or L2 */ 33 #define AUX_IRQ_HINT 0x201 /* For generating Soft Interrupts */ 34 #define AUX_IRQ_LV12 0x43 /* interrupt level register */ 35 36 #define AUX_IENABLE 0x40c 37 #define AUX_ITRIGGER 0x40d 38 #define AUX_IPULSE 0x415 39 40 #ifndef __ASSEMBLY__ 41 42 /****************************************************************** 43 * IRQ Control Macros 44 * 45 * All of them have "memory" clobber (compiler barrier) which is needed to 46 * ensure that LD/ST requiring irq safetly (R-M-W when LLSC is not available) 47 * are redone after IRQs are re-enabled (and gcc doesn't reuse stale register) 48 * 49 * Noted at the time of Abilis Timer List corruption 50 * Orig Bug + Rejected solution : https://lkml.org/lkml/2013/3/29/67 51 * Reasoning : https://lkml.org/lkml/2013/4/8/15 52 * 53 ******************************************************************/ 54 55 /* 56 * Save IRQ state and disable IRQs 57 */ 58 static inline long arch_local_irq_save(void) 59 { 60 unsigned long temp, flags; 61 62 __asm__ __volatile__( 63 " lr %1, [status32] \n" 64 " bic %0, %1, %2 \n" 65 " and.f 0, %1, %2 \n" 66 " flag.nz %0 \n" 67 : "=r"(temp), "=r"(flags) 68 : "n"((STATUS_E1_MASK | STATUS_E2_MASK)) 69 : "memory", "cc"); 70 71 return flags; 72 } 73 74 /* 75 * restore saved IRQ state 76 */ 77 static inline void arch_local_irq_restore(unsigned long flags) 78 { 79 80 __asm__ __volatile__( 81 " flag %0 \n" 82 : 83 : "r"(flags) 84 : "memory"); 85 } 86 87 /* 88 * Unconditionally Enable IRQs 89 */ 90 extern void arch_local_irq_enable(void); 91 92 /* 93 * Unconditionally Disable IRQs 94 */ 95 static inline void arch_local_irq_disable(void) 96 { 97 unsigned long temp; 98 99 __asm__ __volatile__( 100 " lr %0, [status32] \n" 101 " and %0, %0, %1 \n" 102 " flag %0 \n" 103 : "=&r"(temp) 104 : "n"(~(STATUS_E1_MASK | STATUS_E2_MASK)) 105 : "memory"); 106 } 107 108 /* 109 * save IRQ state 110 */ 111 static inline long arch_local_save_flags(void) 112 { 113 unsigned long temp; 114 115 __asm__ __volatile__( 116 " lr %0, [status32] \n" 117 : "=&r"(temp) 118 : 119 : "memory"); 120 121 return temp; 122 } 123 124 /* 125 * Query IRQ state 126 */ 127 static inline int arch_irqs_disabled_flags(unsigned long flags) 128 { 129 return !(flags & (STATUS_E1_MASK 130 #ifdef CONFIG_ARC_COMPACT_IRQ_LEVELS 131 | STATUS_E2_MASK 132 #endif 133 )); 134 } 135 136 static inline int arch_irqs_disabled(void) 137 { 138 return arch_irqs_disabled_flags(arch_local_save_flags()); 139 } 140 141 #else 142 143 #ifdef CONFIG_TRACE_IRQFLAGS 144 145 .macro TRACE_ASM_IRQ_DISABLE 146 bl trace_hardirqs_off 147 .endm 148 149 .macro TRACE_ASM_IRQ_ENABLE 150 bl trace_hardirqs_on 151 .endm 152 153 #else 154 155 .macro TRACE_ASM_IRQ_DISABLE 156 .endm 157 158 .macro TRACE_ASM_IRQ_ENABLE 159 .endm 160 161 #endif 162 163 .macro IRQ_DISABLE scratch 164 lr \scratch, [status32] 165 bic \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK) 166 flag \scratch 167 TRACE_ASM_IRQ_DISABLE 168 .endm 169 170 .macro IRQ_ENABLE scratch 171 lr \scratch, [status32] 172 or \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK) 173 flag \scratch 174 TRACE_ASM_IRQ_ENABLE 175 .endm 176 177 #endif /* __ASSEMBLY__ */ 178 179 #endif 180