arch/xtensa/include/asm/irqflags.h

   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 */