1 /* 2 * Xtensa IRQ flags handling functions 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 2001 - 2005 Tensilica Inc. 9 * Copyright (C) 2015 Cadence Design Systems Inc. 10 */ 11 12 #ifndef _XTENSA_IRQFLAGS_H 13 #define _XTENSA_IRQFLAGS_H 14 15 #include <linux/stringify.h> 16 #include <linux/types.h> 17 #include <asm/processor.h> 18 19 static inline unsigned long arch_local_save_flags(void) 20 { 21 unsigned long flags; 22 asm volatile("rsr %0, ps" : "=a" (flags)); 23 return flags; 24 } 25 26 static inline unsigned long arch_local_irq_save(void) 27 { 28 unsigned long flags; 29 #if XTENSA_FAKE_NMI 30 #if defined(CONFIG_DEBUG_KERNEL) && (LOCKLEVEL | TOPLEVEL) >= XCHAL_DEBUGLEVEL 31 unsigned long tmp; 32 33 asm volatile("rsr %0, ps\t\n" 34 "extui %1, %0, 0, 4\t\n" 35 "bgei %1, "__stringify(LOCKLEVEL)", 1f\t\n" 36 "rsil %0, "__stringify(LOCKLEVEL)"\n" 37 "1:" 38 : "=a" (flags), "=a" (tmp) :: "memory"); 39 #else 40 asm volatile("rsr %0, ps\t\n" 41 "or %0, %0, %1\t\n" 42 "xsr %0, ps\t\n" 43 "rsync" 44 : "=&a" (flags) : "a" (LOCKLEVEL) : "memory"); 45 #endif 46 #else 47 asm volatile("rsil %0, "__stringify(LOCKLEVEL) 48 : "=a" (flags) :: "memory"); 49 #endif 50 return flags; 51 } 52 53 static inline void arch_local_irq_disable(void) 54 { 55 arch_local_irq_save(); 56 } 57 58 static inline void arch_local_irq_enable(void) 59 { 60 unsigned long flags; 61 asm volatile("rsil %0, 0" : "=a" (flags) :: "memory"); 62 } 63 64 static inline void arch_local_irq_restore(unsigned long flags) 65 { 66 asm volatile("wsr %0, ps; rsync" 67 :: "a" (flags) : "memory"); 68 } 69 70 static inline bool arch_irqs_disabled_flags(unsigned long flags) 71 { 72 #if XCHAL_EXCM_LEVEL < LOCKLEVEL || (1 << PS_EXCM_BIT) < LOCKLEVEL 73 #error "XCHAL_EXCM_LEVEL and 1<<PS_EXCM_BIT must be no less than LOCKLEVEL" 74 #endif 75 return (flags & (PS_INTLEVEL_MASK | (1 << PS_EXCM_BIT))) >= LOCKLEVEL; 76 } 77 78 static inline bool arch_irqs_disabled(void) 79 { 80 return arch_irqs_disabled_flags(arch_local_save_flags()); 81 } 82 83 #endif /* _XTENSA_IRQFLAGS_H */ 84