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 /* Provide __cpuidle; we can't safely include <linux/cpu.h> */ 10 #define __cpuidle __attribute__((__section__(".cpuidle.text"))) 11 12 /* 13 * Interrupt control: 14 */ 15 16 /* Declaration required for gcc < 4.9 to prevent -Werror=missing-prototypes */ 17 extern inline unsigned long native_save_fl(void); native_save_fl(void)18extern inline unsigned long native_save_fl(void) 19 { 20 unsigned long flags; 21 22 /* 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. 26 */ 27 asm volatile("# __raw_save_flags\n\t" 28 "pushf ; pop %0" 29 : "=rm" (flags) 30 : /* no input */ 31 : "memory"); 32 33 return flags; 34 } 35 36 extern inline void native_restore_fl(unsigned long flags); native_restore_fl(unsigned long flags)37extern inline void native_restore_fl(unsigned long flags) 38 { 39 asm volatile("push %0 ; popf" 40 : /* no output */ 41 :"g" (flags) 42 :"memory", "cc"); 43 } 44 native_irq_disable(void)45static inline void native_irq_disable(void) 46 { 47 asm volatile("cli": : :"memory"); 48 } 49 native_irq_enable(void)50static inline void native_irq_enable(void) 51 { 52 asm volatile("sti": : :"memory"); 53 } 54 native_safe_halt(void)55static inline __cpuidle void native_safe_halt(void) 56 { 57 asm volatile("sti; hlt": : :"memory"); 58 } 59 native_halt(void)60static inline __cpuidle void native_halt(void) 61 { 62 asm volatile("hlt": : :"memory"); 63 } 64 65 #endif 66 67 #ifdef CONFIG_PARAVIRT 68 #include <asm/paravirt.h> 69 #else 70 #ifndef __ASSEMBLY__ 71 #include <linux/types.h> 72 arch_local_save_flags(void)73static inline notrace unsigned long arch_local_save_flags(void) 74 { 75 return native_save_fl(); 76 } 77 arch_local_irq_restore(unsigned long flags)78static inline notrace void arch_local_irq_restore(unsigned long flags) 79 { 80 native_restore_fl(flags); 81 } 82 arch_local_irq_disable(void)83static inline notrace void arch_local_irq_disable(void) 84 { 85 native_irq_disable(); 86 } 87 arch_local_irq_enable(void)88static inline notrace void arch_local_irq_enable(void) 89 { 90 native_irq_enable(); 91 } 92 93 /* 94 * Used in the idle loop; sti takes one instruction cycle 95 * to complete: 96 */ arch_safe_halt(void)97static inline __cpuidle void arch_safe_halt(void) 98 { 99 native_safe_halt(); 100 } 101 102 /* 103 * Used when interrupts are already enabled or to 104 * shutdown the processor: 105 */ halt(void)106static inline __cpuidle void halt(void) 107 { 108 native_halt(); 109 } 110 111 /* 112 * For spinlocks, etc: 113 */ arch_local_irq_save(void)114static inline notrace unsigned long arch_local_irq_save(void) 115 { 116 unsigned long flags = arch_local_save_flags(); 117 arch_local_irq_disable(); 118 return flags; 119 } 120 #else 121 122 #define ENABLE_INTERRUPTS(x) sti 123 #define DISABLE_INTERRUPTS(x) cli 124 125 #ifdef CONFIG_X86_64 126 #define SWAPGS swapgs 127 /* 128 * Currently paravirt can't handle swapgs nicely when we 129 * don't have a stack we can rely on (such as a user space 130 * stack). So we either find a way around these or just fault 131 * and emulate if a guest tries to call swapgs directly. 132 * 133 * Either way, this is a good way to document that we don't 134 * have a reliable stack. x86_64 only. 135 */ 136 #define SWAPGS_UNSAFE_STACK swapgs 137 138 #define PARAVIRT_ADJUST_EXCEPTION_FRAME /* */ 139 140 #define INTERRUPT_RETURN jmp native_iret 141 #define USERGS_SYSRET64 \ 142 swapgs; \ 143 sysretq; 144 #define USERGS_SYSRET32 \ 145 swapgs; \ 146 sysretl 147 148 #ifdef CONFIG_DEBUG_ENTRY 149 #define SAVE_FLAGS(x) pushfq; popq %rax 150 #endif 151 #else 152 #define INTERRUPT_RETURN iret 153 #define ENABLE_INTERRUPTS_SYSEXIT sti; sysexit 154 #define GET_CR0_INTO_EAX movl %cr0, %eax 155 #endif 156 157 158 #endif /* __ASSEMBLY__ */ 159 #endif /* CONFIG_PARAVIRT */ 160 161 #ifndef __ASSEMBLY__ arch_irqs_disabled_flags(unsigned long flags)162static inline int arch_irqs_disabled_flags(unsigned long flags) 163 { 164 return !(flags & X86_EFLAGS_IF); 165 } 166 arch_irqs_disabled(void)167static inline int arch_irqs_disabled(void) 168 { 169 unsigned long flags = arch_local_save_flags(); 170 171 return arch_irqs_disabled_flags(flags); 172 } 173 #endif /* !__ASSEMBLY__ */ 174 175 #ifdef __ASSEMBLY__ 176 #ifdef CONFIG_TRACE_IRQFLAGS 177 # define TRACE_IRQS_ON call trace_hardirqs_on_thunk; 178 # define TRACE_IRQS_OFF call trace_hardirqs_off_thunk; 179 #else 180 # define TRACE_IRQS_ON 181 # define TRACE_IRQS_OFF 182 #endif 183 #ifdef CONFIG_DEBUG_LOCK_ALLOC 184 # ifdef CONFIG_X86_64 185 # define LOCKDEP_SYS_EXIT call lockdep_sys_exit_thunk 186 # define LOCKDEP_SYS_EXIT_IRQ \ 187 TRACE_IRQS_ON; \ 188 sti; \ 189 call lockdep_sys_exit_thunk; \ 190 cli; \ 191 TRACE_IRQS_OFF; 192 # else 193 # define LOCKDEP_SYS_EXIT \ 194 pushl %eax; \ 195 pushl %ecx; \ 196 pushl %edx; \ 197 call lockdep_sys_exit; \ 198 popl %edx; \ 199 popl %ecx; \ 200 popl %eax; 201 # define LOCKDEP_SYS_EXIT_IRQ 202 # endif 203 #else 204 # define LOCKDEP_SYS_EXIT 205 # define LOCKDEP_SYS_EXIT_IRQ 206 #endif 207 #endif /* __ASSEMBLY__ */ 208 209 #endif 210
