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Current File : /proc/self/root/lib/modules/3.13.0-74-generic/build/arch/x86/include/asm//paravirt.h
#ifndef _ASM_X86_PARAVIRT_H
#define _ASM_X86_PARAVIRT_H
/* Various instructions on x86 need to be replaced for
 * para-virtualization: those hooks are defined here. */

#ifdef CONFIG_PARAVIRT
#include <asm/pgtable_types.h>
#include <asm/asm.h>

#include <asm/paravirt_types.h>

#ifndef __ASSEMBLY__
#include <linux/bug.h>
#include <linux/types.h>
#include <linux/cpumask.h>

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

static inline void load_sp0(struct tss_struct *tss,
			     struct thread_struct *thread)
{
	PVOP_VCALL2(pv_cpu_ops.load_sp0, tss, thread);
}

/* 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);
}

#ifdef CONFIG_X86_64
static inline unsigned long read_cr8(void)
{
	return PVOP_CALL0(unsigned long, pv_cpu_ops.read_cr8);
}

static inline void write_cr8(unsigned long x)
{
	PVOP_VCALL1(pv_cpu_ops.write_cr8, x);
}
#endif

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

static inline void halt(void)
{
	PVOP_VCALL0(pv_irq_ops.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 int rdmsrl_safe(unsigned msr, unsigned long long *p)
{
	int err;

	*p = paravirt_read_msr(msr, &err);
	return 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);
}

struct static_key;
extern struct static_key paravirt_steal_enabled;
extern struct static_key paravirt_steal_rq_enabled;

static inline u64 paravirt_steal_clock(int cpu)
{
	return PVOP_CALL1(u64, pv_time_ops.steal_clock, cpu);
}

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)

#define rdpmcl(counter, val) ((val) = paravirt_read_pmc(counter))

static inline unsigned long long paravirt_rdtscp(unsigned int *aux)
{
	return PVOP_CALL1(u64, pv_cpu_ops.read_tscp, aux);
}

#define rdtscp(low, high, aux)				\
do {							\
	int __aux;					\
	unsigned long __val = paravirt_rdtscp(&__aux);	\
	(low) = (u32)__val;				\
	(high) = (u32)(__val >> 32);			\
	(aux) = __aux;					\
} while (0)

#define rdtscpll(val, aux)				\
do {							\
	unsigned long __aux; 				\
	val = paravirt_rdtscp(&__aux);			\
	(aux) = __aux;					\
} while (0)

static inline void paravirt_alloc_ldt(struct desc_struct *ldt, unsigned entries)
{
	PVOP_VCALL2(pv_cpu_ops.alloc_ldt, ldt, entries);
}

static inline void paravirt_free_ldt(struct desc_struct *ldt, unsigned entries)
{
	PVOP_VCALL2(pv_cpu_ops.free_ldt, ldt, entries);
}

static inline void load_TR_desc(void)
{
	PVOP_VCALL0(pv_cpu_ops.load_tr_desc);
}
static inline void load_gdt(const struct desc_ptr *dtr)
{
	PVOP_VCALL1(pv_cpu_ops.load_gdt, dtr);
}
static inline void load_idt(const struct desc_ptr *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_idt(struct desc_ptr *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);
}

#ifdef CONFIG_X86_64
static inline void load_gs_index(unsigned int gs)
{
	PVOP_VCALL1(pv_cpu_ops.load_gs_index, gs);
}
#endif

static inline void write_ldt_entry(struct desc_struct *dt, int entry,
				   const void *desc)
{
	PVOP_VCALL3(pv_cpu_ops.write_ldt_entry, dt, entry, desc);
}

static inline void write_gdt_entry(struct desc_struct *dt, int entry,
				   void *desc, int type)
{
	PVOP_VCALL4(pv_cpu_ops.write_gdt_entry, dt, entry, desc, type);
}

static inline void write_idt_entry(gate_desc *dt, int entry, const gate_desc *g)
{
	PVOP_VCALL3(pv_cpu_ops.write_idt_entry, dt, entry, g);
}
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_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)
{
	PVOP_VCALL1(pv_mmu_ops.flush_tlb_single, addr);
}

static inline void flush_tlb_others(const struct cpumask *cpumask,
				    struct mm_struct *mm,
				    unsigned long start,
				    unsigned long end)
{
	PVOP_VCALL4(pv_mmu_ops.flush_tlb_others, cpumask, mm, start, end);
}

static inline int paravirt_pgd_alloc(struct mm_struct *mm)
{
	return PVOP_CALL1(int, pv_mmu_ops.pgd_alloc, mm);
}

static inline void paravirt_pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
	PVOP_VCALL2(pv_mmu_ops.pgd_free, mm, pgd);
}

static inline void paravirt_alloc_pte(struct mm_struct *mm, unsigned long pfn)
{
	PVOP_VCALL2(pv_mmu_ops.alloc_pte, mm, pfn);
}
static inline void paravirt_release_pte(unsigned long pfn)
{
	PVOP_VCALL1(pv_mmu_ops.release_pte, pfn);
}

static inline void paravirt_alloc_pmd(struct mm_struct *mm, unsigned long pfn)
{
	PVOP_VCALL2(pv_mmu_ops.alloc_pmd, mm, pfn);
}

static inline void paravirt_release_pmd(unsigned long pfn)
{
	PVOP_VCALL1(pv_mmu_ops.release_pmd, pfn);
}

static inline void paravirt_alloc_pud(struct mm_struct *mm, unsigned long pfn)
{
	PVOP_VCALL2(pv_mmu_ops.alloc_pud, mm, pfn);
}
static inline void paravirt_release_pud(unsigned long pfn)
{
	PVOP_VCALL1(pv_mmu_ops.release_pud, pfn);
}

static inline void pte_update(struct mm_struct *mm, unsigned long addr,
			      pte_t *ptep)
{
	PVOP_VCALL3(pv_mmu_ops.pte_update, mm, addr, ptep);
}
static inline void pmd_update(struct mm_struct *mm, unsigned long addr,
			      pmd_t *pmdp)
{
	PVOP_VCALL3(pv_mmu_ops.pmd_update, mm, addr, pmdp);
}

static inline void pte_update_defer(struct mm_struct *mm, unsigned long addr,
				    pte_t *ptep)
{
	PVOP_VCALL3(pv_mmu_ops.pte_update_defer, mm, addr, ptep);
}

static inline void pmd_update_defer(struct mm_struct *mm, unsigned long addr,
				    pmd_t *pmdp)
{
	PVOP_VCALL3(pv_mmu_ops.pmd_update_defer, mm, addr, pmdp);
}

static inline pte_t __pte(pteval_t val)
{
	pteval_t ret;

	if (sizeof(pteval_t) > sizeof(long))
		ret = PVOP_CALLEE2(pteval_t,
				   pv_mmu_ops.make_pte,
				   val, (u64)val >> 32);
	else
		ret = PVOP_CALLEE1(pteval_t,
				   pv_mmu_ops.make_pte,
				   val);

	return (pte_t) { .pte = ret };
}

static inline pteval_t pte_val(pte_t pte)
{
	pteval_t ret;

	if (sizeof(pteval_t) > sizeof(long))
		ret = PVOP_CALLEE2(pteval_t, pv_mmu_ops.pte_val,
				   pte.pte, (u64)pte.pte >> 32);
	else
		ret = PVOP_CALLEE1(pteval_t, pv_mmu_ops.pte_val,
				   pte.pte);

	return ret;
}

static inline pgd_t __pgd(pgdval_t val)
{
	pgdval_t ret;

	if (sizeof(pgdval_t) > sizeof(long))
		ret = PVOP_CALLEE2(pgdval_t, pv_mmu_ops.make_pgd,
				   val, (u64)val >> 32);
	else
		ret = PVOP_CALLEE1(pgdval_t, pv_mmu_ops.make_pgd,
				   val);

	return (pgd_t) { ret };
}

static inline pgdval_t pgd_val(pgd_t pgd)
{
	pgdval_t ret;

	if (sizeof(pgdval_t) > sizeof(long))
		ret =  PVOP_CALLEE2(pgdval_t, pv_mmu_ops.pgd_val,
				    pgd.pgd, (u64)pgd.pgd >> 32);
	else
		ret =  PVOP_CALLEE1(pgdval_t, pv_mmu_ops.pgd_val,
				    pgd.pgd);

	return ret;
}

#define  __HAVE_ARCH_PTEP_MODIFY_PROT_TRANSACTION
static inline pte_t ptep_modify_prot_start(struct mm_struct *mm, unsigned long addr,
					   pte_t *ptep)
{
	pteval_t ret;

	ret = PVOP_CALL3(pteval_t, pv_mmu_ops.ptep_modify_prot_start,
			 mm, addr, ptep);

	return (pte_t) { .pte = ret };
}

static inline void ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
					   pte_t *ptep, pte_t pte)
{
	if (sizeof(pteval_t) > sizeof(long))
		/* 5 arg words */
		pv_mmu_ops.ptep_modify_prot_commit(mm, addr, ptep, pte);
	else
		PVOP_VCALL4(pv_mmu_ops.ptep_modify_prot_commit,
			    mm, addr, ptep, pte.pte);
}

static inline void set_pte(pte_t *ptep, pte_t pte)
{
	if (sizeof(pteval_t) > sizeof(long))
		PVOP_VCALL3(pv_mmu_ops.set_pte, ptep,
			    pte.pte, (u64)pte.pte >> 32);
	else
		PVOP_VCALL2(pv_mmu_ops.set_pte, ptep,
			    pte.pte);
}

static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
			      pte_t *ptep, pte_t pte)
{
	if (sizeof(pteval_t) > sizeof(long))
		/* 5 arg words */
		pv_mmu_ops.set_pte_at(mm, addr, ptep, pte);
	else
		PVOP_VCALL4(pv_mmu_ops.set_pte_at, mm, addr, ptep, pte.pte);
}

static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
			      pmd_t *pmdp, pmd_t pmd)
{
	if (sizeof(pmdval_t) > sizeof(long))
		/* 5 arg words */
		pv_mmu_ops.set_pmd_at(mm, addr, pmdp, pmd);
	else
		PVOP_VCALL4(pv_mmu_ops.set_pmd_at, mm, addr, pmdp,
			    native_pmd_val(pmd));
}

static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
{
	pmdval_t val = native_pmd_val(pmd);

	if (sizeof(pmdval_t) > sizeof(long))
		PVOP_VCALL3(pv_mmu_ops.set_pmd, pmdp, val, (u64)val >> 32);
	else
		PVOP_VCALL2(pv_mmu_ops.set_pmd, pmdp, val);
}

#if PAGETABLE_LEVELS >= 3
static inline pmd_t __pmd(pmdval_t val)
{
	pmdval_t ret;

	if (sizeof(pmdval_t) > sizeof(long))
		ret = PVOP_CALLEE2(pmdval_t, pv_mmu_ops.make_pmd,
				   val, (u64)val >> 32);
	else
		ret = PVOP_CALLEE1(pmdval_t, pv_mmu_ops.make_pmd,
				   val);

	return (pmd_t) { ret };
}

static inline pmdval_t pmd_val(pmd_t pmd)
{
	pmdval_t ret;

	if (sizeof(pmdval_t) > sizeof(long))
		ret =  PVOP_CALLEE2(pmdval_t, pv_mmu_ops.pmd_val,
				    pmd.pmd, (u64)pmd.pmd >> 32);
	else
		ret =  PVOP_CALLEE1(pmdval_t, pv_mmu_ops.pmd_val,
				    pmd.pmd);

	return ret;
}

static inline void set_pud(pud_t *pudp, pud_t pud)
{
	pudval_t val = native_pud_val(pud);

	if (sizeof(pudval_t) > sizeof(long))
		PVOP_VCALL3(pv_mmu_ops.set_pud, pudp,
			    val, (u64)val >> 32);
	else
		PVOP_VCALL2(pv_mmu_ops.set_pud, pudp,
			    val);
}
#if PAGETABLE_LEVELS == 4
static inline pud_t __pud(pudval_t val)
{
	pudval_t ret;

	if (sizeof(pudval_t) > sizeof(long))
		ret = PVOP_CALLEE2(pudval_t, pv_mmu_ops.make_pud,
				   val, (u64)val >> 32);
	else
		ret = PVOP_CALLEE1(pudval_t, pv_mmu_ops.make_pud,
				   val);

	return (pud_t) { ret };
}

static inline pudval_t pud_val(pud_t pud)
{
	pudval_t ret;

	if (sizeof(pudval_t) > sizeof(long))
		ret =  PVOP_CALLEE2(pudval_t, pv_mmu_ops.pud_val,
				    pud.pud, (u64)pud.pud >> 32);
	else
		ret =  PVOP_CALLEE1(pudval_t, pv_mmu_ops.pud_val,
				    pud.pud);

	return ret;
}

static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
{
	pgdval_t val = native_pgd_val(pgd);

	if (sizeof(pgdval_t) > sizeof(long))
		PVOP_VCALL3(pv_mmu_ops.set_pgd, pgdp,
			    val, (u64)val >> 32);
	else
		PVOP_VCALL2(pv_mmu_ops.set_pgd, pgdp,
			    val);
}

static inline void pgd_clear(pgd_t *pgdp)
{
	set_pgd(pgdp, __pgd(0));
}

static inline void pud_clear(pud_t *pudp)
{
	set_pud(pudp, __pud(0));
}

#endif	/* PAGETABLE_LEVELS == 4 */

#endif	/* PAGETABLE_LEVELS >= 3 */

#ifdef CONFIG_X86_PAE
/* Special-case pte-setting operations for PAE, which can't update a
   64-bit pte atomically */
static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
{
	PVOP_VCALL3(pv_mmu_ops.set_pte_atomic, ptep,
		    pte.pte, pte.pte >> 32);
}

static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
			     pte_t *ptep)
{
	PVOP_VCALL3(pv_mmu_ops.pte_clear, mm, addr, ptep);
}

static inline void pmd_clear(pmd_t *pmdp)
{
	PVOP_VCALL1(pv_mmu_ops.pmd_clear, pmdp);
}
#else  /* !CONFIG_X86_PAE */
static inline void set_pte_atomic(pte_t *ptep, pte_t pte)
{
	set_pte(ptep, pte);
}

static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
			     pte_t *ptep)
{
	set_pte_at(mm, addr, ptep, __pte(0));
}

static inline void pmd_clear(pmd_t *pmdp)
{
	set_pmd(pmdp, __pmd(0));
}
#endif	/* CONFIG_X86_PAE */

#define  __HAVE_ARCH_START_CONTEXT_SWITCH
static inline void arch_start_context_switch(struct task_struct *prev)
{
	PVOP_VCALL1(pv_cpu_ops.start_context_switch, prev);
}

static inline void arch_end_context_switch(struct task_struct *next)
{
	PVOP_VCALL1(pv_cpu_ops.end_context_switch, next);
}

#define  __HAVE_ARCH_ENTER_LAZY_MMU_MODE
static inline void arch_enter_lazy_mmu_mode(void)
{
	PVOP_VCALL0(pv_mmu_ops.lazy_mode.enter);
}

static inline void arch_leave_lazy_mmu_mode(void)
{
	PVOP_VCALL0(pv_mmu_ops.lazy_mode.leave);
}

static inline void arch_flush_lazy_mmu_mode(void)
{
	PVOP_VCALL0(pv_mmu_ops.lazy_mode.flush);
}

static inline void __set_fixmap(unsigned /* enum fixed_addresses */ idx,
				phys_addr_t phys, pgprot_t flags)
{
	pv_mmu_ops.set_fixmap(idx, phys, flags);
}

#if defined(CONFIG_SMP) && defined(CONFIG_PARAVIRT_SPINLOCKS)

static __always_inline void __ticket_lock_spinning(struct arch_spinlock *lock,
							__ticket_t ticket)
{
	PVOP_VCALLEE2(pv_lock_ops.lock_spinning, lock, ticket);
}

static __always_inline void __ticket_unlock_kick(struct arch_spinlock *lock,
							__ticket_t ticket)
{
	PVOP_VCALL2(pv_lock_ops.unlock_kick, lock, ticket);
}

#endif

#ifdef CONFIG_X86_32
#define PV_SAVE_REGS "pushl %ecx; pushl %edx;"
#define PV_RESTORE_REGS "popl %edx; popl %ecx;"

/* save and restore all caller-save registers, except return value */
#define PV_SAVE_ALL_CALLER_REGS		"pushl %ecx;"
#define PV_RESTORE_ALL_CALLER_REGS	"popl  %ecx;"

#define PV_FLAGS_ARG "0"
#define PV_EXTRA_CLOBBERS
#define PV_VEXTRA_CLOBBERS
#else
/* save and restore all caller-save registers, except return value */
#define PV_SAVE_ALL_CALLER_REGS						\
	"push %rcx;"							\
	"push %rdx;"							\
	"push %rsi;"							\
	"push %rdi;"							\
	"push %r8;"							\
	"push %r9;"							\
	"push %r10;"							\
	"push %r11;"
#define PV_RESTORE_ALL_CALLER_REGS					\
	"pop %r11;"							\
	"pop %r10;"							\
	"pop %r9;"							\
	"pop %r8;"							\
	"pop %rdi;"							\
	"pop %rsi;"							\
	"pop %rdx;"							\
	"pop %rcx;"

/* We save some registers, but all of them, that's too much. We clobber all
 * caller saved registers but the argument parameter */
#define PV_SAVE_REGS "pushq %%rdi;"
#define PV_RESTORE_REGS "popq %%rdi;"
#define PV_EXTRA_CLOBBERS EXTRA_CLOBBERS, "rcx" , "rdx", "rsi"
#define PV_VEXTRA_CLOBBERS EXTRA_CLOBBERS, "rdi", "rcx" , "rdx", "rsi"
#define PV_FLAGS_ARG "D"
#endif

/*
 * Generate a thunk around a function which saves all caller-save
 * registers except for the return value.  This allows C functions to
 * be called from assembler code where fewer than normal registers are
 * available.  It may also help code generation around calls from C
 * code if the common case doesn't use many registers.
 *
 * When a callee is wrapped in a thunk, the caller can assume that all
 * arg regs and all scratch registers are preserved across the
 * call. The return value in rax/eax will not be saved, even for void
 * functions.
 */
#define PV_CALLEE_SAVE_REGS_THUNK(func)					\
	extern typeof(func) __raw_callee_save_##func;			\
	static void *__##func##__ __used = func;			\
									\
	asm(".pushsection .text;"					\
	    "__raw_callee_save_" #func ": "				\
	    PV_SAVE_ALL_CALLER_REGS					\
	    "call " #func ";"						\
	    PV_RESTORE_ALL_CALLER_REGS					\
	    "ret;"							\
	    ".popsection")

/* Get a reference to a callee-save function */
#define PV_CALLEE_SAVE(func)						\
	((struct paravirt_callee_save) { __raw_callee_save_##func })

/* Promise that "func" already uses the right calling convention */
#define __PV_IS_CALLEE_SAVE(func)			\
	((struct paravirt_callee_save) { func })

static inline notrace unsigned long arch_local_save_flags(void)
{
	return PVOP_CALLEE0(unsigned long, pv_irq_ops.save_fl);
}

static inline notrace void arch_local_irq_restore(unsigned long f)
{
	PVOP_VCALLEE1(pv_irq_ops.restore_fl, f);
}

static inline notrace void arch_local_irq_disable(void)
{
	PVOP_VCALLEE0(pv_irq_ops.irq_disable);
}

static inline notrace void arch_local_irq_enable(void)
{
	PVOP_VCALLEE0(pv_irq_ops.irq_enable);
}

static inline notrace unsigned long arch_local_irq_save(void)
{
	unsigned long f;

	f = arch_local_save_flags();
	arch_local_irq_disable();
	return f;
}


/* Make sure as little as possible of this mess escapes. */
#undef PARAVIRT_CALL
#undef __PVOP_CALL
#undef __PVOP_VCALL
#undef PVOP_VCALL0
#undef PVOP_CALL0
#undef PVOP_VCALL1
#undef PVOP_CALL1
#undef PVOP_VCALL2
#undef PVOP_CALL2
#undef PVOP_VCALL3
#undef PVOP_CALL3
#undef PVOP_VCALL4
#undef PVOP_CALL4

extern void default_banner(void);

#else  /* __ASSEMBLY__ */

#define _PVSITE(ptype, clobbers, ops, word, algn)	\
771:;						\
	ops;					\
772:;						\
	.pushsection .parainstructions,"a";	\
	 .align	algn;				\
	 word 771b;				\
	 .byte ptype;				\
	 .byte 772b-771b;			\
	 .short clobbers;			\
	.popsection


#define COND_PUSH(set, mask, reg)			\
	.if ((~(set)) & mask); push %reg; .endif
#define COND_POP(set, mask, reg)			\
	.if ((~(set)) & mask); pop %reg; .endif

#ifdef CONFIG_X86_64

#define PV_SAVE_REGS(set)			\
	COND_PUSH(set, CLBR_RAX, rax);		\
	COND_PUSH(set, CLBR_RCX, rcx);		\
	COND_PUSH(set, CLBR_RDX, rdx);		\
	COND_PUSH(set, CLBR_RSI, rsi);		\
	COND_PUSH(set, CLBR_RDI, rdi);		\
	COND_PUSH(set, CLBR_R8, r8);		\
	COND_PUSH(set, CLBR_R9, r9);		\
	COND_PUSH(set, CLBR_R10, r10);		\
	COND_PUSH(set, CLBR_R11, r11)
#define PV_RESTORE_REGS(set)			\
	COND_POP(set, CLBR_R11, r11);		\
	COND_POP(set, CLBR_R10, r10);		\
	COND_POP(set, CLBR_R9, r9);		\
	COND_POP(set, CLBR_R8, r8);		\
	COND_POP(set, CLBR_RDI, rdi);		\
	COND_POP(set, CLBR_RSI, rsi);		\
	COND_POP(set, CLBR_RDX, rdx);		\
	COND_POP(set, CLBR_RCX, rcx);		\
	COND_POP(set, CLBR_RAX, rax)

#define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 8)
#define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
#define PARA_INDIRECT(addr)	*addr(%rip)
#else
#define PV_SAVE_REGS(set)			\
	COND_PUSH(set, CLBR_EAX, eax);		\
	COND_PUSH(set, CLBR_EDI, edi);		\
	COND_PUSH(set, CLBR_ECX, ecx);		\
	COND_PUSH(set, CLBR_EDX, edx)
#define PV_RESTORE_REGS(set)			\
	COND_POP(set, CLBR_EDX, edx);		\
	COND_POP(set, CLBR_ECX, ecx);		\
	COND_POP(set, CLBR_EDI, edi);		\
	COND_POP(set, CLBR_EAX, eax)

#define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 4)
#define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
#define PARA_INDIRECT(addr)	*%cs:addr
#endif

#define INTERRUPT_RETURN						\
	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,	\
		  jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret))

#define DISABLE_INTERRUPTS(clobbers)					\
	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
		  PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);		\
		  call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable);	\
		  PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)

#define ENABLE_INTERRUPTS(clobbers)					\
	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,	\
		  PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);		\
		  call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable);	\
		  PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)

#define USERGS_SYSRET32							\
	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret32),	\
		  CLBR_NONE,						\
		  jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret32))

#ifdef CONFIG_X86_32
#define GET_CR0_INTO_EAX				\
	push %ecx; push %edx;				\
	call PARA_INDIRECT(pv_cpu_ops+PV_CPU_read_cr0);	\
	pop %edx; pop %ecx

#define ENABLE_INTERRUPTS_SYSEXIT					\
	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit),	\
		  CLBR_NONE,						\
		  jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit))


#else	/* !CONFIG_X86_32 */

/*
 * If swapgs is used while the userspace stack is still current,
 * there's no way to call a pvop.  The PV replacement *must* be
 * inlined, or the swapgs instruction must be trapped and emulated.
 */
#define SWAPGS_UNSAFE_STACK						\
	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,	\
		  swapgs)

/*
 * Note: swapgs is very special, and in practise is either going to be
 * implemented with a single "swapgs" instruction or something very
 * special.  Either way, we don't need to save any registers for
 * it.
 */
#define SWAPGS								\
	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,	\
		  call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs)		\
		 )

#define GET_CR2_INTO_RAX				\
	call PARA_INDIRECT(pv_mmu_ops+PV_MMU_read_cr2)

#define PARAVIRT_ADJUST_EXCEPTION_FRAME					\
	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_adjust_exception_frame), \
		  CLBR_NONE,						\
		  call PARA_INDIRECT(pv_irq_ops+PV_IRQ_adjust_exception_frame))

#define USERGS_SYSRET64							\
	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64),	\
		  CLBR_NONE,						\
		  jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64))

#define ENABLE_INTERRUPTS_SYSEXIT32					\
	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_irq_enable_sysexit),	\
		  CLBR_NONE,						\
		  jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_irq_enable_sysexit))
#endif	/* CONFIG_X86_32 */

#endif /* __ASSEMBLY__ */
#else  /* CONFIG_PARAVIRT */
# define default_banner x86_init_noop
#endif /* !CONFIG_PARAVIRT */
#endif /* _ASM_X86_PARAVIRT_H */

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