paravirt.h

linux 内核源代码

			__ret = (rettype)((((u64)__edx) << 32) | __eax); \
		} else {						\
			asm volatile(pre				\
				     paravirt_alt(PARAVIRT_CALL)	\
				     post				\
				     : "=a" (__eax), "=d" (__edx),	\
				       "=c" (__ecx)			\
				     : paravirt_type(op),		\
				       paravirt_clobber(CLBR_ANY),	\
				       ##__VA_ARGS__			\
				     : "memory", "cc");			\
			__ret = (rettype)__eax;				\
		}							\
		__ret;							\
	})
#define __PVOP_VCALL(op, pre, post, ...)				\
	({								\
		unsigned long __eax, __edx, __ecx;			\
		asm volatile(pre					\
			     paravirt_alt(PARAVIRT_CALL)		\
			     post					\
			     : "=a" (__eax), "=d" (__edx), "=c" (__ecx) \
			     : paravirt_type(op),			\
			       paravirt_clobber(CLBR_ANY),		\
			       ##__VA_ARGS__				\
			     : "memory", "cc");				\
	})

#define PVOP_CALL0(rettype, op)						\
	__PVOP_CALL(rettype, op, "", "")
#define PVOP_VCALL0(op)							\
	__PVOP_VCALL(op, "", "")

#define PVOP_CALL1(rettype, op, arg1)					\
	__PVOP_CALL(rettype, op, "", "", "0" ((u32)(arg1)))
#define PVOP_VCALL1(op, arg1)						\
	__PVOP_VCALL(op, "", "", "0" ((u32)(arg1)))

#define PVOP_CALL2(rettype, op, arg1, arg2)				\
	__PVOP_CALL(rettype, op, "", "", "0" ((u32)(arg1)), "1" ((u32)(arg2)))
#define PVOP_VCALL2(op, arg1, arg2)					\
	__PVOP_VCALL(op, "", "", "0" ((u32)(arg1)), "1" ((u32)(arg2)))

#define PVOP_CALL3(rettype, op, arg1, arg2, arg3)			\
	__PVOP_CALL(rettype, op, "", "", "0" ((u32)(arg1)),		\
		    "1"((u32)(arg2)), "2"((u32)(arg3)))
#define PVOP_VCALL3(op, arg1, arg2, arg3)				\
	__PVOP_VCALL(op, "", "", "0" ((u32)(arg1)), "1"((u32)(arg2)),	\
		     "2"((u32)(arg3)))

#define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4)			\
	__PVOP_CALL(rettype, op,					\
		    "push %[_arg4];", "lea 4(%%esp),%%esp;",		\
		    "0" ((u32)(arg1)), "1" ((u32)(arg2)),		\
		    "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))
#define PVOP_VCALL4(op, arg1, arg2, arg3, arg4)				\
	__PVOP_VCALL(op,						\
		    "push %[_arg4];", "lea 4(%%esp),%%esp;",		\
		    "0" ((u32)(arg1)), "1" ((u32)(arg2)),		\
		    "2" ((u32)(arg3)), [_arg4] "mr" ((u32)(arg4)))

static inline int paravirt_enabled(void)
{
	return pv_info.paravirt_enabled;
}

static inline void load_esp0(struct tss_struct *tss,
			     struct thread_struct *thread)
{
	PVOP_VCALL2(pv_cpu_ops.load_esp0, tss, thread);
}

#define ARCH_SETUP			pv_init_ops.arch_setup();
static inline unsigned long get_wallclock(void)
{
	return PVOP_CALL0(unsigned long, pv_time_ops.get_wallclock);
}

static inline int set_wallclock(unsigned long nowtime)
{
	return PVOP_CALL1(int, pv_time_ops.set_wallclock, nowtime);
}

static inline void (*choose_time_init(void))(void)
{
	return pv_time_ops.time_init;
}

/* The paravirtualized CPUID instruction. */
static inline void __cpuid(unsigned int *eax, unsigned int *ebx,
			   unsigned int *ecx, unsigned int *edx)
{
	PVOP_VCALL4(pv_cpu_ops.cpuid, eax, ebx, ecx, edx);
}

/*
 * These special macros can be used to get or set a debugging register
 */
static inline unsigned long paravirt_get_debugreg(int reg)
{
	return PVOP_CALL1(unsigned long, pv_cpu_ops.get_debugreg, reg);
}
#define get_debugreg(var, reg) var = paravirt_get_debugreg(reg)
static inline void set_debugreg(unsigned long val, int reg)
{
	PVOP_VCALL2(pv_cpu_ops.set_debugreg, reg, val);
}

static inline void clts(void)
{
	PVOP_VCALL0(pv_cpu_ops.clts);
}

static inline unsigned long read_cr0(void)
{
	return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr0);
}

static inline void write_cr0(unsigned long x)
{
	PVOP_VCALL1(pv_cpu_ops.write_cr0, x);
}

static inline unsigned long read_cr2(void)
{
	return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr2);
}

static inline void write_cr2(unsigned long x)
{
	PVOP_VCALL1(pv_mmu_ops.write_cr2, x);
}

static inline unsigned long read_cr3(void)
{
	return PVOP_CALL0(unsigned long, pv_mmu_ops.read_cr3);
}

static inline void write_cr3(unsigned long x)
{
	PVOP_VCALL1(pv_mmu_ops.write_cr3, x);
}

static inline unsigned long read_cr4(void)
{
	return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4);
}
static inline unsigned long read_cr4_safe(void)
{
	return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr4_safe);
}

static inline void write_cr4(unsigned long x)
{
	PVOP_VCALL1(pv_cpu_ops.write_cr4, x);
}

static inline void raw_safe_halt(void)
{
	PVOP_VCALL0(pv_irq_ops.safe_halt);
}

static inline void halt(void)
{
	PVOP_VCALL0(pv_irq_ops.safe_halt);
}

static inline void wbinvd(void)
{
	PVOP_VCALL0(pv_cpu_ops.wbinvd);
}

#define get_kernel_rpl()  (pv_info.kernel_rpl)

static inline u64 paravirt_read_msr(unsigned msr, int *err)
{
	return PVOP_CALL2(u64, pv_cpu_ops.read_msr, msr, err);
}
static inline int paravirt_write_msr(unsigned msr, unsigned low, unsigned high)
{
	return PVOP_CALL3(int, pv_cpu_ops.write_msr, msr, low, high);
}

/* These should all do BUG_ON(_err), but our headers are too tangled. */
#define rdmsr(msr,val1,val2) do {		\
	int _err;				\
	u64 _l = paravirt_read_msr(msr, &_err);	\
	val1 = (u32)_l;				\
	val2 = _l >> 32;			\
} while(0)

#define wrmsr(msr,val1,val2) do {		\
	paravirt_write_msr(msr, val1, val2);	\
} while(0)

#define rdmsrl(msr,val) do {			\
	int _err;				\
	val = paravirt_read_msr(msr, &_err);	\
} while(0)

#define wrmsrl(msr,val)		wrmsr(msr, (u32)((u64)(val)), ((u64)(val))>>32)
#define wrmsr_safe(msr,a,b)	paravirt_write_msr(msr, a, b)

/* rdmsr with exception handling */
#define rdmsr_safe(msr,a,b) ({			\
	int _err;				\
	u64 _l = paravirt_read_msr(msr, &_err);	\
	(*a) = (u32)_l;				\
	(*b) = _l >> 32;			\
	_err; })


static inline u64 paravirt_read_tsc(void)
{
	return PVOP_CALL0(u64, pv_cpu_ops.read_tsc);
}

#define rdtscl(low) do {			\
	u64 _l = paravirt_read_tsc();		\
	low = (int)_l;				\
} while(0)

#define rdtscll(val) (val = paravirt_read_tsc())

static inline unsigned long long paravirt_sched_clock(void)
{
	return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock);
}
#define calculate_cpu_khz() (pv_time_ops.get_cpu_khz())

#define write_tsc(val1,val2) wrmsr(0x10, val1, val2)

static inline unsigned long long paravirt_read_pmc(int counter)
{
	return PVOP_CALL1(u64, pv_cpu_ops.read_pmc, counter);
}

#define rdpmc(counter,low,high) do {		\
	u64 _l = paravirt_read_pmc(counter);	\
	low = (u32)_l;				\
	high = _l >> 32;			\
} while(0)

static inline void load_TR_desc(void)
{
	PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
}
static inline void load_gdt(const struct Xgt_desc_struct *dtr)
{
	PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
}
static inline void load_idt(const struct Xgt_desc_struct *dtr)
{
	PVOP_VCALL1(pv_cpu_ops.load_idt, dtr);
}
static inline void set_ldt(const void *addr, unsigned entries)
{
	PVOP_VCALL2(pv_cpu_ops.set_ldt, addr, entries);
}
static inline void store_gdt(struct Xgt_desc_struct *dtr)
{
	PVOP_VCALL1(pv_cpu_ops.store_gdt, dtr);
}
static inline void store_idt(struct Xgt_desc_struct *dtr)
{
	PVOP_VCALL1(pv_cpu_ops.store_idt, dtr);
}
static inline unsigned long paravirt_store_tr(void)
{
	return PVOP_CALL0(unsigned long, pv_cpu_ops.store_tr);
}
#define store_tr(tr)	((tr) = paravirt_store_tr())
static inline void load_TLS(struct thread_struct *t, unsigned cpu)
{
	PVOP_VCALL2(pv_cpu_ops.load_tls, t, cpu);
}
static inline void write_ldt_entry(void *dt, int entry, u32 low, u32 high)
{
	PVOP_VCALL4(pv_cpu_ops.write_ldt_entry, dt, entry, low, high);
}
static inline void write_gdt_entry(void *dt, int entry, u32 low, u32 high)
{
	PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, low, high);
}
static inline void write_idt_entry(void *dt, int entry, u32 low, u32 high)
{
	PVOP_VCALL4(pv_cpu_ops.write_idt_entry, dt, entry, low, high);
}
static inline void set_iopl_mask(unsigned mask)
{
	PVOP_VCALL1(pv_cpu_ops.set_iopl_mask, mask);
}

/* The paravirtualized I/O functions */
static inline void slow_down_io(void) {
	pv_cpu_ops.io_delay();
#ifdef REALLY_SLOW_IO
	pv_cpu_ops.io_delay();
	pv_cpu_ops.io_delay();
	pv_cpu_ops.io_delay();
#endif
}

#ifdef CONFIG_X86_LOCAL_APIC
/*
 * Basic functions accessing APICs.
 */
static inline void apic_write(unsigned long reg, unsigned long v)
{
	PVOP_VCALL2(pv_apic_ops.apic_write, reg, v);
}

static inline void apic_write_atomic(unsigned long reg, unsigned long v)
{
	PVOP_VCALL2(pv_apic_ops.apic_write_atomic, reg, v);
}

static inline unsigned long apic_read(unsigned long reg)
{
	return PVOP_CALL1(unsigned long, pv_apic_ops.apic_read, reg);
}

static inline void setup_boot_clock(void)
{
	PVOP_VCALL0(pv_apic_ops.setup_boot_clock);
}

static inline void setup_secondary_clock(void)
{
	PVOP_VCALL0(pv_apic_ops.setup_secondary_clock);
}
#endif

static inline void paravirt_post_allocator_init(void)
{
	if (pv_init_ops.post_allocator_init)
		(*pv_init_ops.post_allocator_init)();
}

static inline void paravirt_pagetable_setup_start(pgd_t *base)
{
	(*pv_mmu_ops.pagetable_setup_start)(base);
}

static inline void paravirt_pagetable_setup_done(pgd_t *base)
{
	(*pv_mmu_ops.pagetable_setup_done)(base);
}

#ifdef CONFIG_SMP
static inline void startup_ipi_hook(int phys_apicid, unsigned long start_eip,
				    unsigned long start_esp)
{
	PVOP_VCALL3(pv_apic_ops.startup_ipi_hook,
		    phys_apicid, start_eip, start_esp);
}
#endif

static inline void paravirt_activate_mm(struct mm_struct *prev,
					struct mm_struct *next)
{
	PVOP_VCALL2(pv_mmu_ops.activate_mm, prev, next);
}

static inline void arch_dup_mmap(struct mm_struct *oldmm,
				 struct mm_struct *mm)
{
	PVOP_VCALL2(pv_mmu_ops.dup_mmap, oldmm, mm);
}

static inline void arch_exit_mmap(struct mm_struct *mm)
{
	PVOP_VCALL1(pv_mmu_ops.exit_mmap, mm);
}

static inline void __flush_tlb(void)
{
	PVOP_VCALL0(pv_mmu_ops.flush_tlb_user);
}
static inline void __flush_tlb_global(void)
{
	PVOP_VCALL0(pv_mmu_ops.flush_tlb_kernel);
}
static inline void __flush_tlb_single(unsigned long addr)
{