x86, um: ... and asm-x86 move
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Al Viro
H. Peter Anvin
936
arch/x86/include/asm/processor.h
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936
arch/x86/include/asm/processor.h
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@@ -0,0 +1,936 @@
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#ifndef ASM_X86__PROCESSOR_H
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#define ASM_X86__PROCESSOR_H
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#include <asm/processor-flags.h>
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/* Forward declaration, a strange C thing */
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struct task_struct;
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struct mm_struct;
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#include <asm/vm86.h>
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#include <asm/math_emu.h>
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#include <asm/segment.h>
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#include <asm/types.h>
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#include <asm/sigcontext.h>
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#include <asm/current.h>
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#include <asm/cpufeature.h>
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#include <asm/system.h>
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#include <asm/page.h>
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#include <asm/percpu.h>
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#include <asm/msr.h>
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#include <asm/desc_defs.h>
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#include <asm/nops.h>
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#include <asm/ds.h>
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#include <linux/personality.h>
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#include <linux/cpumask.h>
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#include <linux/cache.h>
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#include <linux/threads.h>
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#include <linux/init.h>
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/*
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* Default implementation of macro that returns current
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* instruction pointer ("program counter").
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*/
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static inline void *current_text_addr(void)
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{
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void *pc;
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asm volatile("mov $1f, %0; 1:":"=r" (pc));
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return pc;
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}
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#ifdef CONFIG_X86_VSMP
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# define ARCH_MIN_TASKALIGN (1 << INTERNODE_CACHE_SHIFT)
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# define ARCH_MIN_MMSTRUCT_ALIGN (1 << INTERNODE_CACHE_SHIFT)
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#else
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# define ARCH_MIN_TASKALIGN 16
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# define ARCH_MIN_MMSTRUCT_ALIGN 0
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#endif
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/*
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* CPU type and hardware bug flags. Kept separately for each CPU.
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* Members of this structure are referenced in head.S, so think twice
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* before touching them. [mj]
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*/
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struct cpuinfo_x86 {
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__u8 x86; /* CPU family */
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__u8 x86_vendor; /* CPU vendor */
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__u8 x86_model;
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__u8 x86_mask;
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#ifdef CONFIG_X86_32
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char wp_works_ok; /* It doesn't on 386's */
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/* Problems on some 486Dx4's and old 386's: */
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char hlt_works_ok;
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char hard_math;
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char rfu;
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char fdiv_bug;
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char f00f_bug;
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char coma_bug;
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char pad0;
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#else
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/* Number of 4K pages in DTLB/ITLB combined(in pages): */
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int x86_tlbsize;
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__u8 x86_virt_bits;
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__u8 x86_phys_bits;
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#endif
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/* CPUID returned core id bits: */
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__u8 x86_coreid_bits;
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/* Max extended CPUID function supported: */
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__u32 extended_cpuid_level;
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/* Maximum supported CPUID level, -1=no CPUID: */
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int cpuid_level;
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__u32 x86_capability[NCAPINTS];
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char x86_vendor_id[16];
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char x86_model_id[64];
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/* in KB - valid for CPUS which support this call: */
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int x86_cache_size;
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int x86_cache_alignment; /* In bytes */
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int x86_power;
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unsigned long loops_per_jiffy;
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#ifdef CONFIG_SMP
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/* cpus sharing the last level cache: */
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cpumask_t llc_shared_map;
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#endif
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/* cpuid returned max cores value: */
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u16 x86_max_cores;
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u16 apicid;
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u16 initial_apicid;
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u16 x86_clflush_size;
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#ifdef CONFIG_SMP
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/* number of cores as seen by the OS: */
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u16 booted_cores;
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/* Physical processor id: */
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u16 phys_proc_id;
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/* Core id: */
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u16 cpu_core_id;
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/* Index into per_cpu list: */
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u16 cpu_index;
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#endif
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} __attribute__((__aligned__(SMP_CACHE_BYTES)));
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#define X86_VENDOR_INTEL 0
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#define X86_VENDOR_CYRIX 1
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#define X86_VENDOR_AMD 2
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#define X86_VENDOR_UMC 3
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#define X86_VENDOR_CENTAUR 5
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#define X86_VENDOR_TRANSMETA 7
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#define X86_VENDOR_NSC 8
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#define X86_VENDOR_NUM 9
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#define X86_VENDOR_UNKNOWN 0xff
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/*
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* capabilities of CPUs
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*/
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extern struct cpuinfo_x86 boot_cpu_data;
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extern struct cpuinfo_x86 new_cpu_data;
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extern struct tss_struct doublefault_tss;
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extern __u32 cleared_cpu_caps[NCAPINTS];
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#ifdef CONFIG_SMP
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DECLARE_PER_CPU(struct cpuinfo_x86, cpu_info);
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#define cpu_data(cpu) per_cpu(cpu_info, cpu)
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#define current_cpu_data __get_cpu_var(cpu_info)
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#else
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#define cpu_data(cpu) boot_cpu_data
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#define current_cpu_data boot_cpu_data
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#endif
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extern const struct seq_operations cpuinfo_op;
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static inline int hlt_works(int cpu)
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{
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#ifdef CONFIG_X86_32
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return cpu_data(cpu).hlt_works_ok;
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#else
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return 1;
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#endif
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}
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#define cache_line_size() (boot_cpu_data.x86_cache_alignment)
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extern void cpu_detect(struct cpuinfo_x86 *c);
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extern struct pt_regs *idle_regs(struct pt_regs *);
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extern void early_cpu_init(void);
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extern void identify_boot_cpu(void);
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extern void identify_secondary_cpu(struct cpuinfo_x86 *);
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extern void print_cpu_info(struct cpuinfo_x86 *);
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extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
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extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
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extern unsigned short num_cache_leaves;
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extern void detect_extended_topology(struct cpuinfo_x86 *c);
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extern void detect_ht(struct cpuinfo_x86 *c);
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static inline void native_cpuid(unsigned int *eax, unsigned int *ebx,
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unsigned int *ecx, unsigned int *edx)
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{
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/* ecx is often an input as well as an output. */
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asm("cpuid"
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: "=a" (*eax),
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"=b" (*ebx),
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"=c" (*ecx),
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"=d" (*edx)
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: "0" (*eax), "2" (*ecx));
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}
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static inline void load_cr3(pgd_t *pgdir)
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{
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write_cr3(__pa(pgdir));
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}
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#ifdef CONFIG_X86_32
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/* This is the TSS defined by the hardware. */
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struct x86_hw_tss {
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unsigned short back_link, __blh;
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unsigned long sp0;
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unsigned short ss0, __ss0h;
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unsigned long sp1;
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/* ss1 caches MSR_IA32_SYSENTER_CS: */
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unsigned short ss1, __ss1h;
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unsigned long sp2;
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unsigned short ss2, __ss2h;
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unsigned long __cr3;
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unsigned long ip;
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unsigned long flags;
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unsigned long ax;
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unsigned long cx;
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unsigned long dx;
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unsigned long bx;
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unsigned long sp;
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unsigned long bp;
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unsigned long si;
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unsigned long di;
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unsigned short es, __esh;
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unsigned short cs, __csh;
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unsigned short ss, __ssh;
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unsigned short ds, __dsh;
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unsigned short fs, __fsh;
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unsigned short gs, __gsh;
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unsigned short ldt, __ldth;
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unsigned short trace;
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unsigned short io_bitmap_base;
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} __attribute__((packed));
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#else
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struct x86_hw_tss {
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u32 reserved1;
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u64 sp0;
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u64 sp1;
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u64 sp2;
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u64 reserved2;
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u64 ist[7];
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u32 reserved3;
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u32 reserved4;
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u16 reserved5;
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u16 io_bitmap_base;
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} __attribute__((packed)) ____cacheline_aligned;
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#endif
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/*
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* IO-bitmap sizes:
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*/
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#define IO_BITMAP_BITS 65536
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#define IO_BITMAP_BYTES (IO_BITMAP_BITS/8)
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#define IO_BITMAP_LONGS (IO_BITMAP_BYTES/sizeof(long))
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#define IO_BITMAP_OFFSET offsetof(struct tss_struct, io_bitmap)
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#define INVALID_IO_BITMAP_OFFSET 0x8000
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#define INVALID_IO_BITMAP_OFFSET_LAZY 0x9000
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struct tss_struct {
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/*
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* The hardware state:
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*/
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struct x86_hw_tss x86_tss;
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/*
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* The extra 1 is there because the CPU will access an
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* additional byte beyond the end of the IO permission
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* bitmap. The extra byte must be all 1 bits, and must
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* be within the limit.
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*/
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unsigned long io_bitmap[IO_BITMAP_LONGS + 1];
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/*
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* Cache the current maximum and the last task that used the bitmap:
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*/
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unsigned long io_bitmap_max;
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struct thread_struct *io_bitmap_owner;
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/*
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* .. and then another 0x100 bytes for the emergency kernel stack:
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*/
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unsigned long stack[64];
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} ____cacheline_aligned;
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DECLARE_PER_CPU(struct tss_struct, init_tss);
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/*
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* Save the original ist values for checking stack pointers during debugging
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*/
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struct orig_ist {
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unsigned long ist[7];
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};
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#define MXCSR_DEFAULT 0x1f80
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struct i387_fsave_struct {
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u32 cwd; /* FPU Control Word */
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u32 swd; /* FPU Status Word */
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u32 twd; /* FPU Tag Word */
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u32 fip; /* FPU IP Offset */
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u32 fcs; /* FPU IP Selector */
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u32 foo; /* FPU Operand Pointer Offset */
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u32 fos; /* FPU Operand Pointer Selector */
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/* 8*10 bytes for each FP-reg = 80 bytes: */
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u32 st_space[20];
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/* Software status information [not touched by FSAVE ]: */
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u32 status;
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};
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struct i387_fxsave_struct {
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u16 cwd; /* Control Word */
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u16 swd; /* Status Word */
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u16 twd; /* Tag Word */
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u16 fop; /* Last Instruction Opcode */
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union {
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struct {
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u64 rip; /* Instruction Pointer */
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u64 rdp; /* Data Pointer */
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};
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struct {
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u32 fip; /* FPU IP Offset */
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u32 fcs; /* FPU IP Selector */
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u32 foo; /* FPU Operand Offset */
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u32 fos; /* FPU Operand Selector */
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};
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};
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u32 mxcsr; /* MXCSR Register State */
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u32 mxcsr_mask; /* MXCSR Mask */
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/* 8*16 bytes for each FP-reg = 128 bytes: */
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u32 st_space[32];
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/* 16*16 bytes for each XMM-reg = 256 bytes: */
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u32 xmm_space[64];
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u32 padding[12];
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union {
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u32 padding1[12];
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u32 sw_reserved[12];
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};
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} __attribute__((aligned(16)));
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struct i387_soft_struct {
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u32 cwd;
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u32 swd;
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u32 twd;
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u32 fip;
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u32 fcs;
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u32 foo;
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u32 fos;
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/* 8*10 bytes for each FP-reg = 80 bytes: */
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u32 st_space[20];
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u8 ftop;
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u8 changed;
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u8 lookahead;
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u8 no_update;
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u8 rm;
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u8 alimit;
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struct info *info;
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u32 entry_eip;
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};
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struct xsave_hdr_struct {
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u64 xstate_bv;
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u64 reserved1[2];
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u64 reserved2[5];
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} __attribute__((packed));
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struct xsave_struct {
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struct i387_fxsave_struct i387;
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struct xsave_hdr_struct xsave_hdr;
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/* new processor state extensions will go here */
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} __attribute__ ((packed, aligned (64)));
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union thread_xstate {
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struct i387_fsave_struct fsave;
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struct i387_fxsave_struct fxsave;
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struct i387_soft_struct soft;
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struct xsave_struct xsave;
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};
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#ifdef CONFIG_X86_64
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DECLARE_PER_CPU(struct orig_ist, orig_ist);
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#endif
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extern void print_cpu_info(struct cpuinfo_x86 *);
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extern unsigned int xstate_size;
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extern void free_thread_xstate(struct task_struct *);
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extern struct kmem_cache *task_xstate_cachep;
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extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
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extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
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extern unsigned short num_cache_leaves;
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struct thread_struct {
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/* Cached TLS descriptors: */
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struct desc_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
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unsigned long sp0;
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unsigned long sp;
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#ifdef CONFIG_X86_32
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unsigned long sysenter_cs;
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#else
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unsigned long usersp; /* Copy from PDA */
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unsigned short es;
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unsigned short ds;
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unsigned short fsindex;
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unsigned short gsindex;
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#endif
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unsigned long ip;
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unsigned long fs;
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unsigned long gs;
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/* Hardware debugging registers: */
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unsigned long debugreg0;
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unsigned long debugreg1;
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unsigned long debugreg2;
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unsigned long debugreg3;
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unsigned long debugreg6;
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unsigned long debugreg7;
|
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/* Fault info: */
|
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unsigned long cr2;
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unsigned long trap_no;
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unsigned long error_code;
|
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/* floating point and extended processor state */
|
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union thread_xstate *xstate;
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#ifdef CONFIG_X86_32
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/* Virtual 86 mode info */
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struct vm86_struct __user *vm86_info;
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unsigned long screen_bitmap;
|
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unsigned long v86flags;
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unsigned long v86mask;
|
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unsigned long saved_sp0;
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unsigned int saved_fs;
|
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unsigned int saved_gs;
|
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#endif
|
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/* IO permissions: */
|
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unsigned long *io_bitmap_ptr;
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unsigned long iopl;
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/* Max allowed port in the bitmap, in bytes: */
|
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unsigned io_bitmap_max;
|
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/* MSR_IA32_DEBUGCTLMSR value to switch in if TIF_DEBUGCTLMSR is set. */
|
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unsigned long debugctlmsr;
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#ifdef CONFIG_X86_DS
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/* Debug Store context; see include/asm-x86/ds.h; goes into MSR_IA32_DS_AREA */
|
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struct ds_context *ds_ctx;
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#endif /* CONFIG_X86_DS */
|
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#ifdef CONFIG_X86_PTRACE_BTS
|
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/* the signal to send on a bts buffer overflow */
|
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unsigned int bts_ovfl_signal;
|
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#endif /* CONFIG_X86_PTRACE_BTS */
|
||||
};
|
||||
|
||||
static inline unsigned long native_get_debugreg(int regno)
|
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{
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unsigned long val = 0; /* Damn you, gcc! */
|
||||
|
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switch (regno) {
|
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case 0:
|
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asm("mov %%db0, %0" :"=r" (val));
|
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break;
|
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case 1:
|
||||
asm("mov %%db1, %0" :"=r" (val));
|
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break;
|
||||
case 2:
|
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asm("mov %%db2, %0" :"=r" (val));
|
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break;
|
||||
case 3:
|
||||
asm("mov %%db3, %0" :"=r" (val));
|
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break;
|
||||
case 6:
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||||
asm("mov %%db6, %0" :"=r" (val));
|
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break;
|
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case 7:
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asm("mov %%db7, %0" :"=r" (val));
|
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break;
|
||||
default:
|
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BUG();
|
||||
}
|
||||
return val;
|
||||
}
|
||||
|
||||
static inline void native_set_debugreg(int regno, unsigned long value)
|
||||
{
|
||||
switch (regno) {
|
||||
case 0:
|
||||
asm("mov %0, %%db0" ::"r" (value));
|
||||
break;
|
||||
case 1:
|
||||
asm("mov %0, %%db1" ::"r" (value));
|
||||
break;
|
||||
case 2:
|
||||
asm("mov %0, %%db2" ::"r" (value));
|
||||
break;
|
||||
case 3:
|
||||
asm("mov %0, %%db3" ::"r" (value));
|
||||
break;
|
||||
case 6:
|
||||
asm("mov %0, %%db6" ::"r" (value));
|
||||
break;
|
||||
case 7:
|
||||
asm("mov %0, %%db7" ::"r" (value));
|
||||
break;
|
||||
default:
|
||||
BUG();
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Set IOPL bits in EFLAGS from given mask
|
||||
*/
|
||||
static inline void native_set_iopl_mask(unsigned mask)
|
||||
{
|
||||
#ifdef CONFIG_X86_32
|
||||
unsigned int reg;
|
||||
|
||||
asm volatile ("pushfl;"
|
||||
"popl %0;"
|
||||
"andl %1, %0;"
|
||||
"orl %2, %0;"
|
||||
"pushl %0;"
|
||||
"popfl"
|
||||
: "=&r" (reg)
|
||||
: "i" (~X86_EFLAGS_IOPL), "r" (mask));
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline void
|
||||
native_load_sp0(struct tss_struct *tss, struct thread_struct *thread)
|
||||
{
|
||||
tss->x86_tss.sp0 = thread->sp0;
|
||||
#ifdef CONFIG_X86_32
|
||||
/* Only happens when SEP is enabled, no need to test "SEP"arately: */
|
||||
if (unlikely(tss->x86_tss.ss1 != thread->sysenter_cs)) {
|
||||
tss->x86_tss.ss1 = thread->sysenter_cs;
|
||||
wrmsr(MSR_IA32_SYSENTER_CS, thread->sysenter_cs, 0);
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline void native_swapgs(void)
|
||||
{
|
||||
#ifdef CONFIG_X86_64
|
||||
asm volatile("swapgs" ::: "memory");
|
||||
#endif
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PARAVIRT
|
||||
#include <asm/paravirt.h>
|
||||
#else
|
||||
#define __cpuid native_cpuid
|
||||
#define paravirt_enabled() 0
|
||||
|
||||
/*
|
||||
* These special macros can be used to get or set a debugging register
|
||||
*/
|
||||
#define get_debugreg(var, register) \
|
||||
(var) = native_get_debugreg(register)
|
||||
#define set_debugreg(value, register) \
|
||||
native_set_debugreg(register, value)
|
||||
|
||||
static inline void load_sp0(struct tss_struct *tss,
|
||||
struct thread_struct *thread)
|
||||
{
|
||||
native_load_sp0(tss, thread);
|
||||
}
|
||||
|
||||
#define set_iopl_mask native_set_iopl_mask
|
||||
#endif /* CONFIG_PARAVIRT */
|
||||
|
||||
/*
|
||||
* 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)
|
||||
{
|
||||
unsigned cr4;
|
||||
|
||||
mmu_cr4_features |= mask;
|
||||
cr4 = read_cr4();
|
||||
cr4 |= mask;
|
||||
write_cr4(cr4);
|
||||
}
|
||||
|
||||
static inline void clear_in_cr4(unsigned long mask)
|
||||
{
|
||||
unsigned cr4;
|
||||
|
||||
mmu_cr4_features &= ~mask;
|
||||
cr4 = read_cr4();
|
||||
cr4 &= ~mask;
|
||||
write_cr4(cr4);
|
||||
}
|
||||
|
||||
typedef struct {
|
||||
unsigned long seg;
|
||||
} mm_segment_t;
|
||||
|
||||
|
||||
/*
|
||||
* create a kernel thread without removing it from tasklists
|
||||
*/
|
||||
extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
|
||||
|
||||
/* Free all resources held by a thread. */
|
||||
extern void release_thread(struct task_struct *);
|
||||
|
||||
/* Prepare to copy thread state - unlazy all lazy state */
|
||||
extern void prepare_to_copy(struct task_struct *tsk);
|
||||
|
||||
unsigned long get_wchan(struct task_struct *p);
|
||||
|
||||
/*
|
||||
* Generic CPUID function
|
||||
* clear %ecx since some cpus (Cyrix MII) do not set or clear %ecx
|
||||
* resulting in stale register contents being returned.
|
||||
*/
|
||||
static inline void cpuid(unsigned int op,
|
||||
unsigned int *eax, unsigned int *ebx,
|
||||
unsigned int *ecx, unsigned int *edx)
|
||||
{
|
||||
*eax = op;
|
||||
*ecx = 0;
|
||||
__cpuid(eax, ebx, ecx, edx);
|
||||
}
|
||||
|
||||
/* Some CPUID calls want 'count' to be placed in ecx */
|
||||
static inline void cpuid_count(unsigned int op, int count,
|
||||
unsigned int *eax, unsigned int *ebx,
|
||||
unsigned int *ecx, unsigned int *edx)
|
||||
{
|
||||
*eax = op;
|
||||
*ecx = count;
|
||||
__cpuid(eax, ebx, ecx, edx);
|
||||
}
|
||||
|
||||
/*
|
||||
* CPUID functions returning a single datum
|
||||
*/
|
||||
static inline unsigned int cpuid_eax(unsigned int op)
|
||||
{
|
||||
unsigned int eax, ebx, ecx, edx;
|
||||
|
||||
cpuid(op, &eax, &ebx, &ecx, &edx);
|
||||
|
||||
return eax;
|
||||
}
|
||||
|
||||
static inline unsigned int cpuid_ebx(unsigned int op)
|
||||
{
|
||||
unsigned int eax, ebx, ecx, edx;
|
||||
|
||||
cpuid(op, &eax, &ebx, &ecx, &edx);
|
||||
|
||||
return ebx;
|
||||
}
|
||||
|
||||
static inline unsigned int cpuid_ecx(unsigned int op)
|
||||
{
|
||||
unsigned int eax, ebx, ecx, edx;
|
||||
|
||||
cpuid(op, &eax, &ebx, &ecx, &edx);
|
||||
|
||||
return ecx;
|
||||
}
|
||||
|
||||
static inline unsigned int cpuid_edx(unsigned int op)
|
||||
{
|
||||
unsigned int eax, ebx, ecx, edx;
|
||||
|
||||
cpuid(op, &eax, &ebx, &ecx, &edx);
|
||||
|
||||
return edx;
|
||||
}
|
||||
|
||||
/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
|
||||
static inline void rep_nop(void)
|
||||
{
|
||||
asm volatile("rep; nop" ::: "memory");
|
||||
}
|
||||
|
||||
static inline void cpu_relax(void)
|
||||
{
|
||||
rep_nop();
|
||||
}
|
||||
|
||||
/* Stop speculative execution: */
|
||||
static inline void sync_core(void)
|
||||
{
|
||||
int tmp;
|
||||
|
||||
asm volatile("cpuid" : "=a" (tmp) : "0" (1)
|
||||
: "ebx", "ecx", "edx", "memory");
|
||||
}
|
||||
|
||||
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)
|
||||
{
|
||||
trace_hardirqs_on();
|
||||
/* "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);
|
||||
|
||||
extern void select_idle_routine(const struct cpuinfo_x86 *c);
|
||||
|
||||
extern unsigned long boot_option_idle_override;
|
||||
extern unsigned long idle_halt;
|
||||
extern unsigned long idle_nomwait;
|
||||
|
||||
/*
|
||||
* on systems with caches, caches must be flashed as the absolute
|
||||
* last instruction before going into a suspended halt. Otherwise,
|
||||
* dirty data can linger in the cache and become stale on resume,
|
||||
* leading to strange errors.
|
||||
*
|
||||
* perform a variety of operations to guarantee that the compiler
|
||||
* will not reorder instructions. wbinvd itself is serializing
|
||||
* so the processor will not reorder.
|
||||
*
|
||||
* Systems without cache can just go into halt.
|
||||
*/
|
||||
static inline void wbinvd_halt(void)
|
||||
{
|
||||
mb();
|
||||
/* check for clflush to determine if wbinvd is legal */
|
||||
if (cpu_has_clflush)
|
||||
asm volatile("cli; wbinvd; 1: hlt; jmp 1b" : : : "memory");
|
||||
else
|
||||
while (1)
|
||||
halt();
|
||||
}
|
||||
|
||||
extern void enable_sep_cpu(void);
|
||||
extern int sysenter_setup(void);
|
||||
|
||||
/* Defined in head.S */
|
||||
extern struct desc_ptr early_gdt_descr;
|
||||
|
||||
extern void cpu_set_gdt(int);
|
||||
extern void switch_to_new_gdt(void);
|
||||
extern void cpu_init(void);
|
||||
extern void init_gdt(int cpu);
|
||||
|
||||
static inline void update_debugctlmsr(unsigned long debugctlmsr)
|
||||
{
|
||||
#ifndef CONFIG_X86_DEBUGCTLMSR
|
||||
if (boot_cpu_data.x86 < 6)
|
||||
return;
|
||||
#endif
|
||||
wrmsrl(MSR_IA32_DEBUGCTLMSR, debugctlmsr);
|
||||
}
|
||||
|
||||
/*
|
||||
* from system description table in BIOS. Mostly for MCA use, but
|
||||
* others may find it useful:
|
||||
*/
|
||||
extern unsigned int machine_id;
|
||||
extern unsigned int machine_submodel_id;
|
||||
extern unsigned int BIOS_revision;
|
||||
|
||||
/* Boot loader type from the setup header: */
|
||||
extern int bootloader_type;
|
||||
|
||||
extern char ignore_fpu_irq;
|
||||
|
||||
#define HAVE_ARCH_PICK_MMAP_LAYOUT 1
|
||||
#define ARCH_HAS_PREFETCHW
|
||||
#define ARCH_HAS_SPINLOCK_PREFETCH
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
# define BASE_PREFETCH ASM_NOP4
|
||||
# define ARCH_HAS_PREFETCH
|
||||
#else
|
||||
# define BASE_PREFETCH "prefetcht0 (%1)"
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Prefetch instructions for Pentium III (+) and AMD Athlon (+)
|
||||
*
|
||||
* It's not worth to care about 3dnow prefetches for the K6
|
||||
* because they are microcoded there and very slow.
|
||||
*/
|
||||
static inline void prefetch(const void *x)
|
||||
{
|
||||
alternative_input(BASE_PREFETCH,
|
||||
"prefetchnta (%1)",
|
||||
X86_FEATURE_XMM,
|
||||
"r" (x));
|
||||
}
|
||||
|
||||
/*
|
||||
* 3dnow prefetch to get an exclusive cache line.
|
||||
* Useful for spinlocks to avoid one state transition in the
|
||||
* cache coherency protocol:
|
||||
*/
|
||||
static inline void prefetchw(const void *x)
|
||||
{
|
||||
alternative_input(BASE_PREFETCH,
|
||||
"prefetchw (%1)",
|
||||
X86_FEATURE_3DNOW,
|
||||
"r" (x));
|
||||
}
|
||||
|
||||
static inline void spin_lock_prefetch(const void *x)
|
||||
{
|
||||
prefetchw(x);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
/*
|
||||
* User space process size: 3GB (default).
|
||||
*/
|
||||
#define TASK_SIZE PAGE_OFFSET
|
||||
#define STACK_TOP TASK_SIZE
|
||||
#define STACK_TOP_MAX STACK_TOP
|
||||
|
||||
#define INIT_THREAD { \
|
||||
.sp0 = sizeof(init_stack) + (long)&init_stack, \
|
||||
.vm86_info = NULL, \
|
||||
.sysenter_cs = __KERNEL_CS, \
|
||||
.io_bitmap_ptr = NULL, \
|
||||
.fs = __KERNEL_PERCPU, \
|
||||
}
|
||||
|
||||
/*
|
||||
* Note that the .io_bitmap member must be extra-big. This is 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.
|
||||
*/
|
||||
#define INIT_TSS { \
|
||||
.x86_tss = { \
|
||||
.sp0 = sizeof(init_stack) + (long)&init_stack, \
|
||||
.ss0 = __KERNEL_DS, \
|
||||
.ss1 = __KERNEL_CS, \
|
||||
.io_bitmap_base = INVALID_IO_BITMAP_OFFSET, \
|
||||
}, \
|
||||
.io_bitmap = { [0 ... IO_BITMAP_LONGS] = ~0 }, \
|
||||
}
|
||||
|
||||
extern unsigned long thread_saved_pc(struct task_struct *tsk);
|
||||
|
||||
#define THREAD_SIZE_LONGS (THREAD_SIZE/sizeof(unsigned long))
|
||||
#define KSTK_TOP(info) \
|
||||
({ \
|
||||
unsigned long *__ptr = (unsigned long *)(info); \
|
||||
(unsigned long)(&__ptr[THREAD_SIZE_LONGS]); \
|
||||
})
|
||||
|
||||
/*
|
||||
* The below -8 is to reserve 8 bytes on top of the ring0 stack.
|
||||
* This is necessary to guarantee that the entire "struct pt_regs"
|
||||
* is accessable even if the CPU haven't stored the SS/ESP registers
|
||||
* on the stack (interrupt gate does not save these registers
|
||||
* when switching to the same priv ring).
|
||||
* Therefore beware: accessing the ss/esp fields of the
|
||||
* "struct pt_regs" is possible, but they may contain the
|
||||
* completely wrong values.
|
||||
*/
|
||||
#define task_pt_regs(task) \
|
||||
({ \
|
||||
struct pt_regs *__regs__; \
|
||||
__regs__ = (struct pt_regs *)(KSTK_TOP(task_stack_page(task))-8); \
|
||||
__regs__ - 1; \
|
||||
})
|
||||
|
||||
#define KSTK_ESP(task) (task_pt_regs(task)->sp)
|
||||
|
||||
#else
|
||||
/*
|
||||
* User space process size. 47bits minus one guard page.
|
||||
*/
|
||||
#define TASK_SIZE64 ((1UL << 47) - PAGE_SIZE)
|
||||
|
||||
/* 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 STACK_TOP TASK_SIZE
|
||||
#define STACK_TOP_MAX TASK_SIZE64
|
||||
|
||||
#define INIT_THREAD { \
|
||||
.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
|
||||
}
|
||||
|
||||
#define INIT_TSS { \
|
||||
.x86_tss.sp0 = (unsigned long)&init_stack + sizeof(init_stack) \
|
||||
}
|
||||
|
||||
/*
|
||||
* 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.sp - 8))
|
||||
|
||||
#define task_pt_regs(tsk) ((struct pt_regs *)(tsk)->thread.sp0 - 1)
|
||||
#define KSTK_ESP(tsk) -1 /* sorry. doesn't work for syscall. */
|
||||
#endif /* CONFIG_X86_64 */
|
||||
|
||||
extern void start_thread(struct pt_regs *regs, unsigned long new_ip,
|
||||
unsigned long new_sp);
|
||||
|
||||
/*
|
||||
* This decides where the kernel will search for a free chunk of vm
|
||||
* space during mmap's.
|
||||
*/
|
||||
#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 3))
|
||||
|
||||
#define KSTK_EIP(task) (task_pt_regs(task)->ip)
|
||||
|
||||
/* Get/set a process' ability to use the timestamp counter instruction */
|
||||
#define GET_TSC_CTL(adr) get_tsc_mode((adr))
|
||||
#define SET_TSC_CTL(val) set_tsc_mode((val))
|
||||
|
||||
extern int get_tsc_mode(unsigned long adr);
|
||||
extern int set_tsc_mode(unsigned int val);
|
||||
|
||||
#endif /* ASM_X86__PROCESSOR_H */
|
||||
Reference in New Issue
Block a user