1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _X86_IRQFLAGS_H_
3 #define _X86_IRQFLAGS_H_
5 #include <asm/processor-flags.h>
9 /* Provide __cpuidle; we can't safely include <linux/cpu.h> */
10 #define __cpuidle __attribute__((__section__(".cpuidle.text")))
16 /* Declaration required for gcc < 4.9 to prevent -Werror=missing-prototypes */
17 extern inline unsigned long native_save_fl(void);
18 extern inline unsigned long native_save_fl(void)
23 * "=rm" is safe here, because "pop" adjusts the stack before
24 * it evaluates its effective address -- this is part of the
25 * documented behavior of the "pop" instruction.
27 asm volatile("# __raw_save_flags\n\t"
36 extern inline void native_restore_fl(unsigned long flags);
37 extern inline void native_restore_fl(unsigned long flags)
39 asm volatile("push %0 ; popf"
45 static inline void native_irq_disable(void)
47 asm volatile("cli": : :"memory");
50 static inline void native_irq_enable(void)
52 asm volatile("sti": : :"memory");
55 static inline __cpuidle void native_safe_halt(void)
57 asm volatile("sti; hlt": : :"memory");
60 static inline __cpuidle void native_halt(void)
62 asm volatile("hlt": : :"memory");
67 #ifdef CONFIG_PARAVIRT_XXL
68 #include <asm/paravirt.h>
71 #include <linux/types.h>
73 static inline notrace unsigned long arch_local_save_flags(void)
75 return native_save_fl();
78 static inline notrace void arch_local_irq_restore(unsigned long flags)
80 native_restore_fl(flags);
83 static inline notrace void arch_local_irq_disable(void)
88 static inline notrace void arch_local_irq_enable(void)
94 * Used in the idle loop; sti takes one instruction cycle
97 static inline __cpuidle void arch_safe_halt(void)
103 * Used when interrupts are already enabled or to
104 * shutdown the processor:
106 static inline __cpuidle void halt(void)
112 * For spinlocks, etc:
114 static inline notrace unsigned long arch_local_irq_save(void)
116 unsigned long flags = arch_local_save_flags();
117 arch_local_irq_disable();
122 #define ENABLE_INTERRUPTS(x) sti
123 #define DISABLE_INTERRUPTS(x) cli
126 #ifdef CONFIG_DEBUG_ENTRY
127 #define SAVE_FLAGS(x) pushfq; popq %rax
130 #define SWAPGS swapgs
132 * Currently paravirt can't handle swapgs nicely when we
133 * don't have a stack we can rely on (such as a user space
134 * stack). So we either find a way around these or just fault
135 * and emulate if a guest tries to call swapgs directly.
137 * Either way, this is a good way to document that we don't
138 * have a reliable stack. x86_64 only.
140 #define SWAPGS_UNSAFE_STACK swapgs
142 #define INTERRUPT_RETURN jmp native_iret
143 #define USERGS_SYSRET64 \
146 #define USERGS_SYSRET32 \
151 #define INTERRUPT_RETURN iret
154 #endif /* __ASSEMBLY__ */
155 #endif /* CONFIG_PARAVIRT_XXL */
158 static inline int arch_irqs_disabled_flags(unsigned long flags)
160 return !(flags & X86_EFLAGS_IF);
163 static inline int arch_irqs_disabled(void)
165 unsigned long flags = arch_local_save_flags();
167 return arch_irqs_disabled_flags(flags);
169 #endif /* !__ASSEMBLY__ */
172 #ifdef CONFIG_TRACE_IRQFLAGS
173 # define TRACE_IRQS_ON call trace_hardirqs_on_thunk;
174 # define TRACE_IRQS_OFF call trace_hardirqs_off_thunk;
176 # define TRACE_IRQS_ON
177 # define TRACE_IRQS_OFF
179 #ifdef CONFIG_DEBUG_LOCK_ALLOC
180 # ifdef CONFIG_X86_64
181 # define LOCKDEP_SYS_EXIT call lockdep_sys_exit_thunk
182 # define LOCKDEP_SYS_EXIT_IRQ \
185 call lockdep_sys_exit_thunk; \
189 # define LOCKDEP_SYS_EXIT \
193 call lockdep_sys_exit; \
197 # define LOCKDEP_SYS_EXIT_IRQ
200 # define LOCKDEP_SYS_EXIT
201 # define LOCKDEP_SYS_EXIT_IRQ
203 #endif /* __ASSEMBLY__ */