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