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/types.h> 16 #include <asm/processor.h> 17 18 static inline unsigned long arch_local_save_flags(void) 19 { 20 unsigned long flags; 21 asm volatile("rsr %0, ps" : "=a" (flags)); 22 return flags; 23 } 24 25 static inline unsigned long arch_local_irq_save(void) 26 { 27 unsigned long flags; 28 #if XTENSA_FAKE_NMI 29 #if defined(CONFIG_DEBUG_KERNEL) && (LOCKLEVEL | TOPLEVEL) >= XCHAL_DEBUGLEVEL 30 unsigned long tmp; 31 32 asm volatile("rsr %0, ps\t\n" 33 "extui %1, %0, 0, 4\t\n" 34 "bgei %1, "__stringify(LOCKLEVEL)", 1f\t\n" 35 "rsil %0, "__stringify(LOCKLEVEL)"\n" 36 "1:" 37 : "=a" (flags), "=a" (tmp) :: "memory"); 38 #else 39 asm volatile("rsr %0, ps\t\n" 40 "or %0, %0, %1\t\n" 41 "xsr %0, ps\t\n" 42 "rsync" 43 : "=&a" (flags) : "a" (LOCKLEVEL) : "memory"); 44 #endif 45 #else 46 asm volatile("rsil %0, "__stringify(LOCKLEVEL) 47 : "=a" (flags) :: "memory"); 48 #endif 49 return flags; 50 } 51 52 static inline void arch_local_irq_disable(void) 53 { 54 arch_local_irq_save(); 55 } 56 57 static inline void arch_local_irq_enable(void) 58 { 59 unsigned long flags; 60 asm volatile("rsil %0, 0" : "=a" (flags) :: "memory"); 61 } 62 63 static inline void arch_local_irq_restore(unsigned long flags) 64 { 65 asm volatile("wsr %0, ps; rsync" 66 :: "a" (flags) : "memory"); 67 } 68 69 static inline bool arch_irqs_disabled_flags(unsigned long flags) 70 { 71 #if XCHAL_EXCM_LEVEL < LOCKLEVEL || (1 << PS_EXCM_BIT) < LOCKLEVEL 72 #error "XCHAL_EXCM_LEVEL and 1<<PS_EXCM_BIT must be no less than LOCKLEVEL" 73 #endif 74 return (flags & (PS_INTLEVEL_MASK | (1 << PS_EXCM_BIT))) >= LOCKLEVEL; 75 } 76 77 static inline bool arch_irqs_disabled(void) 78 { 79 return arch_irqs_disabled_flags(arch_local_save_flags()); 80 } 81 82 #endif /* _XTENSA_IRQFLAGS_H */ 83