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 #ifdef __KERNEL__ 19 20 #include <asm/arcregs.h> 21 22 #ifndef __ASSEMBLY__ 23 24 /****************************************************************** 25 * IRQ Control Macros 26 ******************************************************************/ 27 28 /* 29 * Save IRQ state and disable IRQs 30 */ 31 static inline long arch_local_irq_save(void) 32 { 33 unsigned long temp, flags; 34 35 __asm__ __volatile__( 36 " lr %1, [status32] \n" 37 " bic %0, %1, %2 \n" 38 " and.f 0, %1, %2 \n" 39 " flag.nz %0 \n" 40 : "=r"(temp), "=r"(flags) 41 : "n"((STATUS_E1_MASK | STATUS_E2_MASK)) 42 : "memory", "cc"); 43 44 return flags; 45 } 46 47 /* 48 * restore saved IRQ state 49 */ 50 static inline void arch_local_irq_restore(unsigned long flags) 51 { 52 53 __asm__ __volatile__( 54 " flag %0 \n" 55 : 56 : "r"(flags) 57 : "memory"); 58 } 59 60 /* 61 * Unconditionally Enable IRQs 62 */ 63 extern void arch_local_irq_enable(void); 64 65 /* 66 * Unconditionally Disable IRQs 67 */ 68 static inline void arch_local_irq_disable(void) 69 { 70 unsigned long temp; 71 72 __asm__ __volatile__( 73 " lr %0, [status32] \n" 74 " and %0, %0, %1 \n" 75 " flag %0 \n" 76 : "=&r"(temp) 77 : "n"(~(STATUS_E1_MASK | STATUS_E2_MASK)) 78 : "memory"); 79 } 80 81 /* 82 * save IRQ state 83 */ 84 static inline long arch_local_save_flags(void) 85 { 86 unsigned long temp; 87 88 __asm__ __volatile__( 89 " lr %0, [status32] \n" 90 : "=&r"(temp) 91 : 92 : "memory"); 93 94 return temp; 95 } 96 97 /* 98 * Query IRQ state 99 */ 100 static inline int arch_irqs_disabled_flags(unsigned long flags) 101 { 102 return !(flags & (STATUS_E1_MASK 103 #ifdef CONFIG_ARC_COMPACT_IRQ_LEVELS 104 | STATUS_E2_MASK 105 #endif 106 )); 107 } 108 109 static inline int arch_irqs_disabled(void) 110 { 111 return arch_irqs_disabled_flags(arch_local_save_flags()); 112 } 113 114 static inline void arch_mask_irq(unsigned int irq) 115 { 116 unsigned int ienb; 117 118 ienb = read_aux_reg(AUX_IENABLE); 119 ienb &= ~(1 << irq); 120 write_aux_reg(AUX_IENABLE, ienb); 121 } 122 123 static inline void arch_unmask_irq(unsigned int irq) 124 { 125 unsigned int ienb; 126 127 ienb = read_aux_reg(AUX_IENABLE); 128 ienb |= (1 << irq); 129 write_aux_reg(AUX_IENABLE, ienb); 130 } 131 132 #else 133 134 .macro IRQ_DISABLE scratch 135 lr \scratch, [status32] 136 bic \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK) 137 flag \scratch 138 .endm 139 140 .macro IRQ_DISABLE_SAVE scratch, save 141 lr \scratch, [status32] 142 mov \save, \scratch /* Make a copy */ 143 bic \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK) 144 flag \scratch 145 .endm 146 147 .macro IRQ_ENABLE scratch 148 lr \scratch, [status32] 149 or \scratch, \scratch, (STATUS_E1_MASK | STATUS_E2_MASK) 150 flag \scratch 151 .endm 152 153 #endif /* __ASSEMBLY__ */ 154 155 #endif /* KERNEL */ 156 157 #endif 158