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linux/include/asm-x86_64/processor.h
Venkatesh Pallipadi d331e739f5 [PATCH] x86-64: Fix interrupt race in idle callback (3rd try) 
Idle callbacks has some races when enter_idle() sets isidle and subsequent
interrupts that can happen on that CPU, before CPU goes to idle. Due to this,
an IDLE_END can get called before IDLE_START. To avoid these races, disable
interrupts before enter_idle and make sure that all idle routines do not
enable interrupts before entering idle.

Note that poll_idle() still has a this race as it has to enable interrupts
before going to idle. But, all other idle routines have the race fixed.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
2006-12-07 02:14:13 +01:00

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/*
* include/asm-x86_64/processor.h
*
* Copyright (C) 1994 Linus Torvalds
*/
#ifndef __ASM_X86_64_PROCESSOR_H
#define __ASM_X86_64_PROCESSOR_H
#include <asm/segment.h>
#include <asm/page.h>
#include <asm/types.h>
#include <asm/sigcontext.h>
#include <asm/cpufeature.h>
#include <linux/threads.h>
#include <asm/msr.h>
#include <asm/current.h>
#include <asm/system.h>
#include <asm/mmsegment.h>
#include <asm/percpu.h>
#include <linux/personality.h>
#include <linux/cpumask.h>
#define TF_MASK 0x00000100
#define IF_MASK 0x00000200
#define IOPL_MASK 0x00003000
#define NT_MASK 0x00004000
#define VM_MASK 0x00020000
#define AC_MASK 0x00040000
#define VIF_MASK 0x00080000 /* virtual interrupt flag */
#define VIP_MASK 0x00100000 /* virtual interrupt pending */
#define ID_MASK 0x00200000
#define desc_empty(desc) \
(!((desc)->a | (desc)->b))
#define desc_equal(desc1, desc2) \
(((desc1)->a == (desc2)->a) && ((desc1)->b == (desc2)->b))
/*
* Default implementation of macro that returns current
* instruction pointer ("program counter").
*/
#define current_text_addr() ({ void *pc; asm volatile("leaq 1f(%%rip),%0\n1:":"=r"(pc)); pc; })
/*
* CPU type and hardware bug flags. Kept separately for each CPU.
*/
struct cpuinfo_x86 {
__u8 x86; /* CPU family */
__u8 x86_vendor; /* CPU vendor */
__u8 x86_model;
__u8 x86_mask;
int cpuid_level; /* Maximum supported CPUID level, -1=no CPUID */
__u32 x86_capability[NCAPINTS];
char x86_vendor_id[16];
char x86_model_id[64];
int x86_cache_size; /* in KB */
int x86_clflush_size;
int x86_cache_alignment;
int x86_tlbsize; /* number of 4K pages in DTLB/ITLB combined(in pages)*/
__u8 x86_virt_bits, x86_phys_bits;
__u8 x86_max_cores; /* cpuid returned max cores value */
__u32 x86_power;
__u32 extended_cpuid_level; /* Max extended CPUID function supported */
unsigned long loops_per_jiffy;
#ifdef CONFIG_SMP
cpumask_t llc_shared_map; /* cpus sharing the last level cache */
#endif
__u8 apicid;
#ifdef CONFIG_SMP
__u8 booted_cores; /* number of cores as seen by OS */
__u8 phys_proc_id; /* Physical Processor id. */
__u8 cpu_core_id; /* Core id. */
#endif
} ____cacheline_aligned;
#define X86_VENDOR_INTEL 0
#define X86_VENDOR_CYRIX 1
#define X86_VENDOR_AMD 2
#define X86_VENDOR_UMC 3
#define X86_VENDOR_NEXGEN 4
#define X86_VENDOR_CENTAUR 5
#define X86_VENDOR_RISE 6
#define X86_VENDOR_TRANSMETA 7
#define X86_VENDOR_NUM 8
#define X86_VENDOR_UNKNOWN 0xff
#ifdef CONFIG_SMP
extern struct cpuinfo_x86 cpu_data[];
#define current_cpu_data cpu_data[smp_processor_id()]
#else
#define cpu_data (&boot_cpu_data)
#define current_cpu_data boot_cpu_data
#endif
extern char ignore_irq13;
extern void identify_cpu(struct cpuinfo_x86 *);
extern void print_cpu_info(struct cpuinfo_x86 *);
extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
extern unsigned short num_cache_leaves;
/*
* EFLAGS bits
*/
#define X86_EFLAGS_CF 0x00000001 /* Carry Flag */
#define X86_EFLAGS_PF 0x00000004 /* Parity Flag */
#define X86_EFLAGS_AF 0x00000010 /* Auxillary carry Flag */
#define X86_EFLAGS_ZF 0x00000040 /* Zero Flag */
#define X86_EFLAGS_SF 0x00000080 /* Sign Flag */
#define X86_EFLAGS_TF 0x00000100 /* Trap Flag */
#define X86_EFLAGS_IF 0x00000200 /* Interrupt Flag */
#define X86_EFLAGS_DF 0x00000400 /* Direction Flag */
#define X86_EFLAGS_OF 0x00000800 /* Overflow Flag */
#define X86_EFLAGS_IOPL 0x00003000 /* IOPL mask */
#define X86_EFLAGS_NT 0x00004000 /* Nested Task */
#define X86_EFLAGS_RF 0x00010000 /* Resume Flag */
#define X86_EFLAGS_VM 0x00020000 /* Virtual Mode */
#define X86_EFLAGS_AC 0x00040000 /* Alignment Check */
#define X86_EFLAGS_VIF 0x00080000 /* Virtual Interrupt Flag */
#define X86_EFLAGS_VIP 0x00100000 /* Virtual Interrupt Pending */
#define X86_EFLAGS_ID 0x00200000 /* CPUID detection flag */
/*
* Intel CPU features in CR4
*/
#define X86_CR4_VME 0x0001 /* enable vm86 extensions */
#define X86_CR4_PVI 0x0002 /* virtual interrupts flag enable */
#define X86_CR4_TSD 0x0004 /* disable time stamp at ipl 3 */
#define X86_CR4_DE 0x0008 /* enable debugging extensions */
#define X86_CR4_PSE 0x0010 /* enable page size extensions */
#define X86_CR4_PAE 0x0020 /* enable physical address extensions */
#define X86_CR4_MCE 0x0040 /* Machine check enable */
#define X86_CR4_PGE 0x0080 /* enable global pages */
#define X86_CR4_PCE 0x0100 /* enable performance counters at ipl 3 */
#define X86_CR4_OSFXSR 0x0200 /* enable fast FPU save and restore */
#define X86_CR4_OSXMMEXCPT 0x0400 /* enable unmasked SSE exceptions */
/*
* Save the cr4 feature set we're using (ie
* Pentium 4MB enable and PPro Global page
* enable), so that any CPU's that boot up
* after us can get the correct flags.
*/
extern unsigned long mmu_cr4_features;
static inline void set_in_cr4 (unsigned long mask)
{
mmu_cr4_features |= mask;
__asm__("movq %%cr4,%%rax\n\t"
"orq %0,%%rax\n\t"
"movq %%rax,%%cr4\n"
: : "irg" (mask)
:"ax");
}
static inline void clear_in_cr4 (unsigned long mask)
{
mmu_cr4_features &= ~mask;
__asm__("movq %%cr4,%%rax\n\t"
"andq %0,%%rax\n\t"
"movq %%rax,%%cr4\n"
: : "irg" (~mask)
:"ax");
}
/*
* User space process size. 47bits minus one guard page.
*/
#define TASK_SIZE64 (0x800000000000UL - 4096)
/* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
*/
#define IA32_PAGE_OFFSET ((current->personality & ADDR_LIMIT_3GB) ? 0xc0000000 : 0xFFFFe000)
#define TASK_SIZE (test_thread_flag(TIF_IA32) ? IA32_PAGE_OFFSET : TASK_SIZE64)
#define TASK_SIZE_OF(child) ((test_tsk_thread_flag(child, TIF_IA32)) ? IA32_PAGE_OFFSET : TASK_SIZE64)
#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE/3)
/*
* Size of io_bitmap.
*/
#define IO_BITMAP_BITS 65536
#define IO_BITMAP_BYTES (IO_BITMAP_BITS/8)
#define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long))
#define IO_BITMAP_OFFSET offsetof(struct tss_struct,io_bitmap)
#define INVALID_IO_BITMAP_OFFSET 0x8000
struct i387_fxsave_struct {
u16 cwd;
u16 swd;
u16 twd;
u16 fop;
u64 rip;
u64 rdp;
u32 mxcsr;
u32 mxcsr_mask;
u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 128 bytes */
u32 padding[24];
} __attribute__ ((aligned (16)));
union i387_union {
struct i387_fxsave_struct fxsave;
};
struct tss_struct {
u32 reserved1;
u64 rsp0;
u64 rsp1;
u64 rsp2;
u64 reserved2;
u64 ist[7];
u32 reserved3;
u32 reserved4;
u16 reserved5;
u16 io_bitmap_base;
/*
* The extra 1 is there because the CPU will access an
* additional byte beyond the end of the IO permission
* bitmap. The extra byte must be all 1 bits, and must
* be within the limit. Thus we have:
*
* 128 bytes, the bitmap itself, for ports 0..0x3ff
* 8 bytes, for an extra "long" of ~0UL
*/
unsigned long io_bitmap[IO_BITMAP_LONGS + 1];
} __attribute__((packed)) ____cacheline_aligned;
extern struct cpuinfo_x86 boot_cpu_data;
DECLARE_PER_CPU(struct tss_struct,init_tss);
/* Save the original ist values for checking stack pointers during debugging */
struct orig_ist {
unsigned long ist[7];
};
DECLARE_PER_CPU(struct orig_ist, orig_ist);
#ifdef CONFIG_X86_VSMP
#define ARCH_MIN_TASKALIGN (1 << INTERNODE_CACHE_SHIFT)
#define ARCH_MIN_MMSTRUCT_ALIGN (1 << INTERNODE_CACHE_SHIFT)
#else
#define ARCH_MIN_TASKALIGN 16
#define ARCH_MIN_MMSTRUCT_ALIGN 0
#endif
struct thread_struct {
unsigned long rsp0;
unsigned long rsp;
unsigned long userrsp; /* Copy from PDA */
unsigned long fs;
unsigned long gs;
unsigned short es, ds, fsindex, gsindex;
/* Hardware debugging registers */
unsigned long debugreg0;
unsigned long debugreg1;
unsigned long debugreg2;
unsigned long debugreg3;
unsigned long debugreg6;
unsigned long debugreg7;
/* fault info */
unsigned long cr2, trap_no, error_code;
/* floating point info */
union i387_union i387 __attribute__((aligned(16)));
/* IO permissions. the bitmap could be moved into the GDT, that would make
switch faster for a limited number of ioperm using tasks. -AK */
int ioperm;
unsigned long *io_bitmap_ptr;
unsigned io_bitmap_max;
/* cached TLS descriptors. */
u64 tls_array[GDT_ENTRY_TLS_ENTRIES];
} __attribute__((aligned(16)));
#define INIT_THREAD { \
.rsp0 = (unsigned long)&init_stack + sizeof(init_stack) \
}
#define INIT_TSS { \
.rsp0 = (unsigned long)&init_stack + sizeof(init_stack) \
}
#define INIT_MMAP \
{ &init_mm, 0, 0, NULL, PAGE_SHARED, VM_READ | VM_WRITE | VM_EXEC, 1, NULL, NULL }
#define start_thread(regs,new_rip,new_rsp) do { \
asm volatile("movl %0,%%fs; movl %0,%%es; movl %0,%%ds": :"r" (0)); \
load_gs_index(0); \
(regs)->rip = (new_rip); \
(regs)->rsp = (new_rsp); \
write_pda(oldrsp, (new_rsp)); \
(regs)->cs = __USER_CS; \
(regs)->ss = __USER_DS; \
(regs)->eflags = 0x200; \
set_fs(USER_DS); \
} while(0)
#define get_debugreg(var, register) \
__asm__("movq %%db" #register ", %0" \
:"=r" (var))
#define set_debugreg(value, register) \
__asm__("movq %0,%%db" #register \
: /* no output */ \
:"r" (value))
struct task_struct;
struct mm_struct;
/* Free all resources held by a thread. */
extern void release_thread(struct task_struct *);
/* Prepare to copy thread state - unlazy all lazy status */
extern void prepare_to_copy(struct task_struct *tsk);
/*
* create a kernel thread without removing it from tasklists
*/
extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
/*
* Return saved PC of a blocked thread.
* What is this good for? it will be always the scheduler or ret_from_fork.
*/
#define thread_saved_pc(t) (*(unsigned long *)((t)->thread.rsp - 8))
extern unsigned long get_wchan(struct task_struct *p);
#define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.rsp0 - 1)
#define KSTK_EIP(tsk) (task_pt_regs(tsk)->rip)
#define KSTK_ESP(tsk) -1 /* sorry. doesn't work for syscall. */
struct microcode_header {
unsigned int hdrver;
unsigned int rev;
unsigned int date;
unsigned int sig;
unsigned int cksum;
unsigned int ldrver;
unsigned int pf;
unsigned int datasize;
unsigned int totalsize;
unsigned int reserved[3];
};
struct microcode {
struct microcode_header hdr;
unsigned int bits[0];
};
typedef struct microcode microcode_t;
typedef struct microcode_header microcode_header_t;
/* microcode format is extended from prescott processors */
struct extended_signature {
unsigned int sig;
unsigned int pf;
unsigned int cksum;
};
struct extended_sigtable {
unsigned int count;
unsigned int cksum;
unsigned int reserved[3];
struct extended_signature sigs[0];
};
#define ASM_NOP1 K8_NOP1
#define ASM_NOP2 K8_NOP2
#define ASM_NOP3 K8_NOP3
#define ASM_NOP4 K8_NOP4
#define ASM_NOP5 K8_NOP5
#define ASM_NOP6 K8_NOP6
#define ASM_NOP7 K8_NOP7
#define ASM_NOP8 K8_NOP8
/* Opteron nops */
#define K8_NOP1 ".byte 0x90\n"
#define K8_NOP2 ".byte 0x66,0x90\n"
#define K8_NOP3 ".byte 0x66,0x66,0x90\n"
#define K8_NOP4 ".byte 0x66,0x66,0x66,0x90\n"
#define K8_NOP5 K8_NOP3 K8_NOP2
#define K8_NOP6 K8_NOP3 K8_NOP3
#define K8_NOP7 K8_NOP4 K8_NOP3
#define K8_NOP8 K8_NOP4 K8_NOP4
#define ASM_NOP_MAX 8
/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
static inline void rep_nop(void)
{
__asm__ __volatile__("rep;nop": : :"memory");
}
/* Stop speculative execution */
static inline void sync_core(void)
{
int tmp;
asm volatile("cpuid" : "=a" (tmp) : "0" (1) : "ebx","ecx","edx","memory");
}
#define cpu_has_fpu 1
#define ARCH_HAS_PREFETCH
static inline void prefetch(void *x)
{
asm volatile("prefetcht0 %0" :: "m" (*(unsigned long *)x));
}
#define ARCH_HAS_PREFETCHW 1
static inline void prefetchw(void *x)
{
alternative_input("prefetcht0 (%1)",
"prefetchw (%1)",
X86_FEATURE_3DNOW,
"r" (x));
}
#define ARCH_HAS_SPINLOCK_PREFETCH 1
#define spin_lock_prefetch(x) prefetchw(x)
#define cpu_relax() rep_nop()
/*
* NSC/Cyrix CPU configuration register indexes
*/
#define CX86_CCR0 0xc0
#define CX86_CCR1 0xc1
#define CX86_CCR2 0xc2
#define CX86_CCR3 0xc3
#define CX86_CCR4 0xe8
#define CX86_CCR5 0xe9
#define CX86_CCR6 0xea
#define CX86_CCR7 0xeb
#define CX86_DIR0 0xfe
#define CX86_DIR1 0xff
#define CX86_ARR_BASE 0xc4
#define CX86_RCR_BASE 0xdc
/*
* NSC/Cyrix CPU indexed register access macros
*/
#define getCx86(reg) ({ outb((reg), 0x22); inb(0x23); })
#define setCx86(reg, data) do { \
outb((reg), 0x22); \
outb((data), 0x23); \
} while (0)
static inline void serialize_cpu(void)
{
__asm__ __volatile__ ("cpuid" : : : "ax", "bx", "cx", "dx");
}
static inline void __monitor(const void *eax, unsigned long ecx,
unsigned long edx)
{
/* "monitor %eax,%ecx,%edx;" */
asm volatile(
".byte 0x0f,0x01,0xc8;"
: :"a" (eax), "c" (ecx), "d"(edx));
}
static inline void __mwait(unsigned long eax, unsigned long ecx)
{
/* "mwait %eax,%ecx;" */
asm volatile(
".byte 0x0f,0x01,0xc9;"
: :"a" (eax), "c" (ecx));
}
static inline void __sti_mwait(unsigned long eax, unsigned long ecx)
{
/* "mwait %eax,%ecx;" */
asm volatile(
"sti; .byte 0x0f,0x01,0xc9;"
: :"a" (eax), "c" (ecx));
}
extern void mwait_idle_with_hints(unsigned long eax, unsigned long ecx);
#define stack_current() \
({ \
struct thread_info *ti; \
asm("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK)); \
ti->task; \
})
#define cache_line_size() (boot_cpu_data.x86_cache_alignment)
extern unsigned long boot_option_idle_override;
/* Boot loader type from the setup header */
extern int bootloader_type;
#define HAVE_ARCH_PICK_MMAP_LAYOUT 1
#endif /* __ASM_X86_64_PROCESSOR_H */
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