1#ifndef _X86_IRQFLAGS_H_ 2#define _X86_IRQFLAGS_H_ 3 4#include <asm/processor-flags.h> 5 6#ifndef __ASSEMBLY__ 7/* 8 * Interrupt control: 9 */ 10 11static inline unsigned long native_save_fl(void) 12{ 13 unsigned long flags; 14 15 /* 16 * "=rm" is safe here, because "pop" adjusts the stack before 17 * it evaluates its effective address -- this is part of the 18 * documented behavior of the "pop" instruction. 19 */ 20 asm volatile("# __raw_save_flags\n\t" 21 "pushf ; pop %0" 22 : "=rm" (flags) 23 : /* no input */ 24 : "memory"); 25 26 return flags; 27} 28 29static inline void native_restore_fl(unsigned long flags) 30{ 31 asm volatile("push %0 ; popf" 32 : /* no output */ 33 :"g" (flags) 34 :"memory", "cc"); 35} 36 37static inline void native_irq_disable(void) 38{ 39 asm volatile("cli": : :"memory"); 40} 41 42static inline void native_irq_enable(void) 43{ 44 asm volatile("sti": : :"memory"); 45} 46 47static inline void native_safe_halt(void) 48{ 49 asm volatile("sti; hlt": : :"memory"); 50} 51 52static inline void native_halt(void) 53{ 54 asm volatile("hlt": : :"memory"); 55} 56 57#endif 58 59#ifdef CONFIG_PARAVIRT 60#include <asm/paravirt.h> 61#else 62#ifndef __ASSEMBLY__ 63 64static inline unsigned long __raw_local_save_flags(void) 65{ 66 return native_save_fl(); 67} 68 69static inline void raw_local_irq_restore(unsigned long flags) 70{ 71 native_restore_fl(flags); 72} 73 74static inline void raw_local_irq_disable(void) 75{ 76 native_irq_disable(); 77} 78 79static inline void raw_local_irq_enable(void) 80{ 81 native_irq_enable(); 82} 83 84/* 85 * Used in the idle loop; sti takes one instruction cycle 86 * to complete: 87 */ 88static inline void raw_safe_halt(void) 89{ 90 native_safe_halt(); 91} 92 93/* 94 * Used when interrupts are already enabled or to 95 * shutdown the processor: 96 */ 97static inline void halt(void) 98{ 99 native_halt(); 100} 101 102/* 103 * For spinlocks, etc: 104 */ 105static inline unsigned long __raw_local_irq_save(void) 106{ 107 unsigned long flags = __raw_local_save_flags(); 108 109 raw_local_irq_disable(); 110 111 return flags; 112} 113#else 114 115#define ENABLE_INTERRUPTS(x) sti 116#define DISABLE_INTERRUPTS(x) cli 117 118#ifdef CONFIG_X86_64 119#define SWAPGS swapgs 120/* 121 * Currently paravirt can't handle swapgs nicely when we 122 * don't have a stack we can rely on (such as a user space 123 * stack). So we either find a way around these or just fault 124 * and emulate if a guest tries to call swapgs directly. 125 * 126 * Either way, this is a good way to document that we don't 127 * have a reliable stack. x86_64 only. 128 */ 129#define SWAPGS_UNSAFE_STACK swapgs 130 131#define PARAVIRT_ADJUST_EXCEPTION_FRAME /* */ 132 133#define INTERRUPT_RETURN iretq 134#define USERGS_SYSRET64 \ 135 swapgs; \ 136 sysretq; 137#define USERGS_SYSRET32 \ 138 swapgs; \ 139 sysretl 140#define ENABLE_INTERRUPTS_SYSEXIT32 \ 141 swapgs; \ 142 sti; \ 143 sysexit 144 145#else 146#define INTERRUPT_RETURN iret 147#define ENABLE_INTERRUPTS_SYSEXIT sti; sysexit 148#define GET_CR0_INTO_EAX movl %cr0, %eax 149#endif 150 151 152#endif /* __ASSEMBLY__ */ 153#endif /* CONFIG_PARAVIRT */ 154 155#ifndef __ASSEMBLY__ 156#define raw_local_save_flags(flags) \ 157 do { (flags) = __raw_local_save_flags(); } while (0) 158 159#define raw_local_irq_save(flags) \ 160 do { (flags) = __raw_local_irq_save(); } while (0) 161 162static inline int raw_irqs_disabled_flags(unsigned long flags) 163{ 164 return !(flags & X86_EFLAGS_IF); 165} 166 167static inline int raw_irqs_disabled(void) 168{ 169 unsigned long flags = __raw_local_save_flags(); 170 171 return raw_irqs_disabled_flags(flags); 172} 173 174#else 175 176#ifdef CONFIG_X86_64 177#define ARCH_LOCKDEP_SYS_EXIT call lockdep_sys_exit_thunk 178#define ARCH_LOCKDEP_SYS_EXIT_IRQ \ 179 TRACE_IRQS_ON; \ 180 sti; \ 181 SAVE_REST; \ 182 LOCKDEP_SYS_EXIT; \ 183 RESTORE_REST; \ 184 cli; \ 185 TRACE_IRQS_OFF; 186 187#else 188#define ARCH_LOCKDEP_SYS_EXIT \ 189 pushl %eax; \ 190 pushl %ecx; \ 191 pushl %edx; \ 192 call lockdep_sys_exit; \ 193 popl %edx; \ 194 popl %ecx; \ 195 popl %eax; 196 197#define ARCH_LOCKDEP_SYS_EXIT_IRQ 198#endif 199 200#ifdef CONFIG_TRACE_IRQFLAGS 201# define TRACE_IRQS_ON call trace_hardirqs_on_thunk; 202# define TRACE_IRQS_OFF call trace_hardirqs_off_thunk; 203#else 204# define TRACE_IRQS_ON 205# define TRACE_IRQS_OFF 206#endif 207#ifdef CONFIG_DEBUG_LOCK_ALLOC 208# define LOCKDEP_SYS_EXIT ARCH_LOCKDEP_SYS_EXIT 209# define LOCKDEP_SYS_EXIT_IRQ ARCH_LOCKDEP_SYS_EXIT_IRQ 210# else 211# define LOCKDEP_SYS_EXIT 212# define LOCKDEP_SYS_EXIT_IRQ 213# endif 214 215#endif /* __ASSEMBLY__ */ 216#endif 217