projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| df9ee292 DH |
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. | |
| 38fef73c | 9 | * Copyright (C) 2015 Cadence Design Systems Inc. |
| df9ee292 DH |
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; | |
| bc5378fc | 20 | asm volatile("rsr %0, ps" : "=a" (flags)); |
| df9ee292 DH |
21 | return flags; |
| 22 | } | |
| 23 | ||
| 24 | static inline unsigned long arch_local_irq_save(void) | |
| 25 | { | |
| 26 | unsigned long flags; | |
| 38fef73c MF |
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) | |
| df9ee292 | 46 | : "=a" (flags) :: "memory"); |
| 38fef73c | 47 | #endif |
| df9ee292 DH |
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 | { | |
| bc5378fc | 64 | asm volatile("wsr %0, ps; rsync" |
| df9ee292 DH |
65 | :: "a" (flags) : "memory"); |
| 66 | } | |
| 67 | ||
| 68 | static inline bool arch_irqs_disabled_flags(unsigned long flags) | |
| 69 | { | |
| 031d0112 MF |
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; | |
| df9ee292 DH |
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 */ |