1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _X86_IRQFLAGS_H_ 3 #define _X86_IRQFLAGS_H_ 4 5 #include <asm/processor-flags.h> 6 7 #ifndef __ASSEMBLY__ 8 9 #include <asm/nospec-branch.h> 10 11 /* Provide __cpuidle; we can't safely include <linux/cpu.h> */ 12 #define __cpuidle __section(".cpuidle.text") 13 14 /* 15 * Interrupt control: 16 */ 17 18 /* Declaration required for gcc < 4.9 to prevent -Werror=missing-prototypes */ 19 extern inline unsigned long native_save_fl(void); native_save_fl(void)20extern __always_inline unsigned long native_save_fl(void) 21 { 22 unsigned long flags; 23 24 /* 25 * "=rm" is safe here, because "pop" adjusts the stack before 26 * it evaluates its effective address -- this is part of the 27 * documented behavior of the "pop" instruction. 28 */ 29 asm volatile("# __raw_save_flags\n\t" 30 "pushf ; pop %0" 31 : "=rm" (flags) 32 : /* no input */ 33 : "memory"); 34 35 return flags; 36 } 37 38 extern inline void native_restore_fl(unsigned long flags); native_restore_fl(unsigned long flags)39extern inline void native_restore_fl(unsigned long flags) 40 { 41 asm volatile("push %0 ; popf" 42 : /* no output */ 43 :"g" (flags) 44 :"memory", "cc"); 45 } 46 native_irq_disable(void)47static __always_inline void native_irq_disable(void) 48 { 49 asm volatile("cli": : :"memory"); 50 } 51 native_irq_enable(void)52static __always_inline void native_irq_enable(void) 53 { 54 asm volatile("sti": : :"memory"); 55 } 56 native_safe_halt(void)57static inline __cpuidle void native_safe_halt(void) 58 { 59 mds_idle_clear_cpu_buffers(); 60 asm volatile("sti; hlt": : :"memory"); 61 } 62 native_halt(void)63static inline __cpuidle void native_halt(void) 64 { 65 mds_idle_clear_cpu_buffers(); 66 asm volatile("hlt": : :"memory"); 67 } 68 69 #endif 70 71 #ifdef CONFIG_PARAVIRT_XXL 72 #include <asm/paravirt.h> 73 #else 74 #ifndef __ASSEMBLY__ 75 #include <linux/types.h> 76 arch_local_save_flags(void)77static __always_inline unsigned long arch_local_save_flags(void) 78 { 79 return native_save_fl(); 80 } 81 arch_local_irq_restore(unsigned long flags)82static __always_inline void arch_local_irq_restore(unsigned long flags) 83 { 84 native_restore_fl(flags); 85 } 86 arch_local_irq_disable(void)87static __always_inline void arch_local_irq_disable(void) 88 { 89 native_irq_disable(); 90 } 91 arch_local_irq_enable(void)92static __always_inline void arch_local_irq_enable(void) 93 { 94 native_irq_enable(); 95 } 96 97 /* 98 * Used in the idle loop; sti takes one instruction cycle 99 * to complete: 100 */ arch_safe_halt(void)101static inline __cpuidle void arch_safe_halt(void) 102 { 103 native_safe_halt(); 104 } 105 106 /* 107 * Used when interrupts are already enabled or to 108 * shutdown the processor: 109 */ halt(void)110static inline __cpuidle void halt(void) 111 { 112 native_halt(); 113 } 114 115 /* 116 * For spinlocks, etc: 117 */ arch_local_irq_save(void)118static __always_inline unsigned long arch_local_irq_save(void) 119 { 120 unsigned long flags = arch_local_save_flags(); 121 arch_local_irq_disable(); 122 return flags; 123 } 124 #else 125 126 #define ENABLE_INTERRUPTS(x) sti 127 #define DISABLE_INTERRUPTS(x) cli 128 129 #ifdef CONFIG_X86_64 130 #ifdef CONFIG_DEBUG_ENTRY 131 #define SAVE_FLAGS(x) pushfq; popq %rax 132 #endif 133 134 #define INTERRUPT_RETURN jmp native_iret 135 #define USERGS_SYSRET64 \ 136 swapgs; \ 137 sysretq; 138 #define USERGS_SYSRET32 \ 139 swapgs; \ 140 sysretl 141 142 #else 143 #define INTERRUPT_RETURN iret 144 #endif 145 146 #endif /* __ASSEMBLY__ */ 147 #endif /* CONFIG_PARAVIRT_XXL */ 148 149 #ifndef __ASSEMBLY__ arch_irqs_disabled_flags(unsigned long flags)150static __always_inline int arch_irqs_disabled_flags(unsigned long flags) 151 { 152 return !(flags & X86_EFLAGS_IF); 153 } 154 arch_irqs_disabled(void)155static __always_inline int arch_irqs_disabled(void) 156 { 157 unsigned long flags = arch_local_save_flags(); 158 159 return arch_irqs_disabled_flags(flags); 160 } 161 #else 162 #ifdef CONFIG_X86_64 163 #ifdef CONFIG_XEN_PV 164 #define SWAPGS ALTERNATIVE "swapgs", "", X86_FEATURE_XENPV 165 #else 166 #define SWAPGS swapgs 167 #endif 168 #endif 169 #endif /* !__ASSEMBLY__ */ 170 171 #endif 172