564 lines
18 KiB
C
564 lines
18 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_PARAVIRT_TYPES_H
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#define _ASM_X86_PARAVIRT_TYPES_H
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#ifndef __ASSEMBLY__
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/* These all sit in the .parainstructions section to tell us what to patch. */
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struct paravirt_patch_site {
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u8 *instr; /* original instructions */
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u8 type; /* type of this instruction */
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u8 len; /* length of original instruction */
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};
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#endif
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#ifdef CONFIG_PARAVIRT
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#ifndef __ASSEMBLY__
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#include <asm/desc_defs.h>
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#include <asm/pgtable_types.h>
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#include <asm/nospec-branch.h>
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struct page;
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struct thread_struct;
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struct desc_ptr;
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struct tss_struct;
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struct mm_struct;
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struct desc_struct;
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struct task_struct;
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struct cpumask;
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struct flush_tlb_info;
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struct mmu_gather;
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struct vm_area_struct;
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/*
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* Wrapper type for pointers to code which uses the non-standard
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* calling convention. See PV_CALL_SAVE_REGS_THUNK below.
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*/
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struct paravirt_callee_save {
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void *func;
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};
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/* general info */
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struct pv_info {
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#ifdef CONFIG_PARAVIRT_XXL
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u16 extra_user_64bit_cs; /* __USER_CS if none */
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#endif
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const char *name;
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};
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#ifdef CONFIG_PARAVIRT_XXL
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struct pv_lazy_ops {
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/* Set deferred update mode, used for batching operations. */
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void (*enter)(void);
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void (*leave)(void);
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void (*flush)(void);
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} __no_randomize_layout;
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#endif
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struct pv_cpu_ops {
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/* hooks for various privileged instructions */
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void (*io_delay)(void);
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#ifdef CONFIG_PARAVIRT_XXL
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unsigned long (*get_debugreg)(int regno);
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void (*set_debugreg)(int regno, unsigned long value);
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unsigned long (*read_cr0)(void);
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void (*write_cr0)(unsigned long);
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void (*write_cr4)(unsigned long);
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/* Segment descriptor handling */
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void (*load_tr_desc)(void);
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void (*load_gdt)(const struct desc_ptr *);
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void (*load_idt)(const struct desc_ptr *);
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void (*set_ldt)(const void *desc, unsigned entries);
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unsigned long (*store_tr)(void);
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void (*load_tls)(struct thread_struct *t, unsigned int cpu);
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void (*load_gs_index)(unsigned int idx);
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void (*write_ldt_entry)(struct desc_struct *ldt, int entrynum,
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const void *desc);
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void (*write_gdt_entry)(struct desc_struct *,
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int entrynum, const void *desc, int size);
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void (*write_idt_entry)(gate_desc *,
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int entrynum, const gate_desc *gate);
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void (*alloc_ldt)(struct desc_struct *ldt, unsigned entries);
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void (*free_ldt)(struct desc_struct *ldt, unsigned entries);
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void (*load_sp0)(unsigned long sp0);
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#ifdef CONFIG_X86_IOPL_IOPERM
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void (*invalidate_io_bitmap)(void);
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void (*update_io_bitmap)(void);
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#endif
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void (*wbinvd)(void);
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/* cpuid emulation, mostly so that caps bits can be disabled */
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void (*cpuid)(unsigned int *eax, unsigned int *ebx,
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unsigned int *ecx, unsigned int *edx);
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/* Unsafe MSR operations. These will warn or panic on failure. */
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u64 (*read_msr)(unsigned int msr);
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void (*write_msr)(unsigned int msr, unsigned low, unsigned high);
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/*
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* Safe MSR operations.
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* read sets err to 0 or -EIO. write returns 0 or -EIO.
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*/
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u64 (*read_msr_safe)(unsigned int msr, int *err);
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int (*write_msr_safe)(unsigned int msr, unsigned low, unsigned high);
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u64 (*read_pmc)(int counter);
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void (*start_context_switch)(struct task_struct *prev);
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void (*end_context_switch)(struct task_struct *next);
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#endif
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} __no_randomize_layout;
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struct pv_irq_ops {
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#ifdef CONFIG_PARAVIRT_XXL
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/*
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* Get/set interrupt state. save_fl is expected to use X86_EFLAGS_IF;
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* all other bits returned from save_fl are undefined.
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*
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* NOTE: These functions callers expect the callee to preserve
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* more registers than the standard C calling convention.
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*/
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struct paravirt_callee_save save_fl;
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struct paravirt_callee_save irq_disable;
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struct paravirt_callee_save irq_enable;
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void (*safe_halt)(void);
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void (*halt)(void);
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#endif
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} __no_randomize_layout;
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struct pv_mmu_ops {
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/* TLB operations */
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void (*flush_tlb_user)(void);
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void (*flush_tlb_kernel)(void);
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void (*flush_tlb_one_user)(unsigned long addr);
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void (*flush_tlb_multi)(const struct cpumask *cpus,
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const struct flush_tlb_info *info);
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void (*tlb_remove_table)(struct mmu_gather *tlb, void *table);
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/* Hook for intercepting the destruction of an mm_struct. */
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void (*exit_mmap)(struct mm_struct *mm);
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void (*notify_page_enc_status_changed)(unsigned long pfn, int npages, bool enc);
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#ifdef CONFIG_PARAVIRT_XXL
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struct paravirt_callee_save read_cr2;
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void (*write_cr2)(unsigned long);
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unsigned long (*read_cr3)(void);
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void (*write_cr3)(unsigned long);
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/* Hook for intercepting the creation/use of an mm_struct. */
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void (*enter_mmap)(struct mm_struct *mm);
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/* Hooks for allocating and freeing a pagetable top-level */
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int (*pgd_alloc)(struct mm_struct *mm);
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void (*pgd_free)(struct mm_struct *mm, pgd_t *pgd);
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/*
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* Hooks for allocating/releasing pagetable pages when they're
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* attached to a pagetable
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*/
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void (*alloc_pte)(struct mm_struct *mm, unsigned long pfn);
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void (*alloc_pmd)(struct mm_struct *mm, unsigned long pfn);
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void (*alloc_pud)(struct mm_struct *mm, unsigned long pfn);
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void (*alloc_p4d)(struct mm_struct *mm, unsigned long pfn);
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void (*release_pte)(unsigned long pfn);
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void (*release_pmd)(unsigned long pfn);
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void (*release_pud)(unsigned long pfn);
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void (*release_p4d)(unsigned long pfn);
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/* Pagetable manipulation functions */
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void (*set_pte)(pte_t *ptep, pte_t pteval);
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void (*set_pmd)(pmd_t *pmdp, pmd_t pmdval);
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pte_t (*ptep_modify_prot_start)(struct vm_area_struct *vma, unsigned long addr,
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pte_t *ptep);
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void (*ptep_modify_prot_commit)(struct vm_area_struct *vma, unsigned long addr,
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pte_t *ptep, pte_t pte);
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struct paravirt_callee_save pte_val;
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struct paravirt_callee_save make_pte;
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struct paravirt_callee_save pgd_val;
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struct paravirt_callee_save make_pgd;
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void (*set_pud)(pud_t *pudp, pud_t pudval);
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struct paravirt_callee_save pmd_val;
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struct paravirt_callee_save make_pmd;
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struct paravirt_callee_save pud_val;
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struct paravirt_callee_save make_pud;
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void (*set_p4d)(p4d_t *p4dp, p4d_t p4dval);
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#if CONFIG_PGTABLE_LEVELS >= 5
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struct paravirt_callee_save p4d_val;
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struct paravirt_callee_save make_p4d;
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void (*set_pgd)(pgd_t *pgdp, pgd_t pgdval);
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#endif /* CONFIG_PGTABLE_LEVELS >= 5 */
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struct pv_lazy_ops lazy_mode;
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/* dom0 ops */
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/* Sometimes the physical address is a pfn, and sometimes its
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an mfn. We can tell which is which from the index. */
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void (*set_fixmap)(unsigned /* enum fixed_addresses */ idx,
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phys_addr_t phys, pgprot_t flags);
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#endif
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} __no_randomize_layout;
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struct arch_spinlock;
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#ifdef CONFIG_SMP
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#include <asm/spinlock_types.h>
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#endif
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struct qspinlock;
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struct pv_lock_ops {
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void (*queued_spin_lock_slowpath)(struct qspinlock *lock, u32 val);
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struct paravirt_callee_save queued_spin_unlock;
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void (*wait)(u8 *ptr, u8 val);
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void (*kick)(int cpu);
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struct paravirt_callee_save vcpu_is_preempted;
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} __no_randomize_layout;
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/* This contains all the paravirt structures: we get a convenient
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* number for each function using the offset which we use to indicate
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* what to patch. */
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struct paravirt_patch_template {
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struct pv_cpu_ops cpu;
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struct pv_irq_ops irq;
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struct pv_mmu_ops mmu;
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struct pv_lock_ops lock;
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} __no_randomize_layout;
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extern struct pv_info pv_info;
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extern struct paravirt_patch_template pv_ops;
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#define PARAVIRT_PATCH(x) \
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(offsetof(struct paravirt_patch_template, x) / sizeof(void *))
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#define paravirt_type(op) \
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[paravirt_typenum] "i" (PARAVIRT_PATCH(op)), \
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[paravirt_opptr] "m" (pv_ops.op)
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/*
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* Generate some code, and mark it as patchable by the
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* apply_paravirt() alternate instruction patcher.
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*/
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#define _paravirt_alt(insn_string, type) \
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"771:\n\t" insn_string "\n" "772:\n" \
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".pushsection .parainstructions,\"a\"\n" \
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_ASM_ALIGN "\n" \
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_ASM_PTR " 771b\n" \
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" .byte " type "\n" \
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" .byte 772b-771b\n" \
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_ASM_ALIGN "\n" \
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".popsection\n"
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/* Generate patchable code, with the default asm parameters. */
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#define paravirt_alt(insn_string) \
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_paravirt_alt(insn_string, "%c[paravirt_typenum]")
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/* Simple instruction patching code. */
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#define NATIVE_LABEL(a,x,b) "\n\t.globl " a #x "_" #b "\n" a #x "_" #b ":\n\t"
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unsigned int paravirt_patch(u8 type, void *insn_buff, unsigned long addr, unsigned int len);
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int paravirt_disable_iospace(void);
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/*
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* This generates an indirect call based on the operation type number.
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* The type number, computed in PARAVIRT_PATCH, is derived from the
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* offset into the paravirt_patch_template structure, and can therefore be
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* freely converted back into a structure offset.
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*/
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#define PARAVIRT_CALL \
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ANNOTATE_RETPOLINE_SAFE \
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"call *%[paravirt_opptr];"
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/*
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* These macros are intended to wrap calls through one of the paravirt
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* ops structs, so that they can be later identified and patched at
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* runtime.
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*
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* Normally, a call to a pv_op function is a simple indirect call:
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* (pv_op_struct.operations)(args...).
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*
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* Unfortunately, this is a relatively slow operation for modern CPUs,
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* because it cannot necessarily determine what the destination
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* address is. In this case, the address is a runtime constant, so at
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* the very least we can patch the call to a simple direct call, or,
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* ideally, patch an inline implementation into the callsite. (Direct
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* calls are essentially free, because the call and return addresses
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* are completely predictable.)
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*
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* For i386, these macros rely on the standard gcc "regparm(3)" calling
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* convention, in which the first three arguments are placed in %eax,
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* %edx, %ecx (in that order), and the remaining arguments are placed
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* on the stack. All caller-save registers (eax,edx,ecx) are expected
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* to be modified (either clobbered or used for return values).
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* X86_64, on the other hand, already specifies a register-based calling
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* conventions, returning at %rax, with parameters going in %rdi, %rsi,
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* %rdx, and %rcx. Note that for this reason, x86_64 does not need any
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* special handling for dealing with 4 arguments, unlike i386.
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* However, x86_64 also has to clobber all caller saved registers, which
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* unfortunately, are quite a bit (r8 - r11)
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*
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* The call instruction itself is marked by placing its start address
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* and size into the .parainstructions section, so that
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* apply_paravirt() in arch/i386/kernel/alternative.c can do the
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* appropriate patching under the control of the backend pv_init_ops
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* implementation.
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*
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* Unfortunately there's no way to get gcc to generate the args setup
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* for the call, and then allow the call itself to be generated by an
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* inline asm. Because of this, we must do the complete arg setup and
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* return value handling from within these macros. This is fairly
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* cumbersome.
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*
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* There are 5 sets of PVOP_* macros for dealing with 0-4 arguments.
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* It could be extended to more arguments, but there would be little
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* to be gained from that. For each number of arguments, there are
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* two VCALL and CALL variants for void and non-void functions.
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*
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* When there is a return value, the invoker of the macro must specify
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* the return type. The macro then uses sizeof() on that type to
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* determine whether it's a 32 or 64 bit value and places the return
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* in the right register(s) (just %eax for 32-bit, and %edx:%eax for
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* 64-bit). For x86_64 machines, it just returns in %rax regardless of
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* the return value size.
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*
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* 64-bit arguments are passed as a pair of adjacent 32-bit arguments;
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* i386 also passes 64-bit arguments as a pair of adjacent 32-bit arguments
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* in low,high order
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*
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* Small structures are passed and returned in registers. The macro
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* calling convention can't directly deal with this, so the wrapper
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* functions must do it.
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*
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* These PVOP_* macros are only defined within this header. This
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* means that all uses must be wrapped in inline functions. This also
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* makes sure the incoming and outgoing types are always correct.
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*/
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#ifdef CONFIG_X86_32
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#define PVOP_CALL_ARGS \
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unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx;
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#define PVOP_CALL_ARG1(x) "a" ((unsigned long)(x))
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#define PVOP_CALL_ARG2(x) "d" ((unsigned long)(x))
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#define PVOP_CALL_ARG3(x) "c" ((unsigned long)(x))
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#define PVOP_VCALL_CLOBBERS "=a" (__eax), "=d" (__edx), \
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"=c" (__ecx)
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#define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS
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#define PVOP_VCALLEE_CLOBBERS "=a" (__eax), "=d" (__edx)
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#define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS
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#define EXTRA_CLOBBERS
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#define VEXTRA_CLOBBERS
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#else /* CONFIG_X86_64 */
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/* [re]ax isn't an arg, but the return val */
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#define PVOP_CALL_ARGS \
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unsigned long __edi = __edi, __esi = __esi, \
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__edx = __edx, __ecx = __ecx, __eax = __eax;
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#define PVOP_CALL_ARG1(x) "D" ((unsigned long)(x))
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#define PVOP_CALL_ARG2(x) "S" ((unsigned long)(x))
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#define PVOP_CALL_ARG3(x) "d" ((unsigned long)(x))
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#define PVOP_CALL_ARG4(x) "c" ((unsigned long)(x))
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#define PVOP_VCALL_CLOBBERS "=D" (__edi), \
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"=S" (__esi), "=d" (__edx), \
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"=c" (__ecx)
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#define PVOP_CALL_CLOBBERS PVOP_VCALL_CLOBBERS, "=a" (__eax)
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/*
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* void functions are still allowed [re]ax for scratch.
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*
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* The ZERO_CALL_USED REGS feature may end up zeroing out callee-saved
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* registers. Make sure we model this with the appropriate clobbers.
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*/
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#ifdef CONFIG_ZERO_CALL_USED_REGS
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#define PVOP_VCALLEE_CLOBBERS "=a" (__eax), PVOP_VCALL_CLOBBERS
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#else
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#define PVOP_VCALLEE_CLOBBERS "=a" (__eax)
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#endif
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#define PVOP_CALLEE_CLOBBERS PVOP_VCALLEE_CLOBBERS
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#define EXTRA_CLOBBERS , "r8", "r9", "r10", "r11"
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#define VEXTRA_CLOBBERS , "rax", "r8", "r9", "r10", "r11"
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#endif /* CONFIG_X86_32 */
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#ifdef CONFIG_PARAVIRT_DEBUG
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#define PVOP_TEST_NULL(op) BUG_ON(pv_ops.op == NULL)
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#else
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#define PVOP_TEST_NULL(op) ((void)pv_ops.op)
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#endif
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#define PVOP_RETVAL(rettype) \
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({ unsigned long __mask = ~0UL; \
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BUILD_BUG_ON(sizeof(rettype) > sizeof(unsigned long)); \
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switch (sizeof(rettype)) { \
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case 1: __mask = 0xffUL; break; \
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case 2: __mask = 0xffffUL; break; \
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case 4: __mask = 0xffffffffUL; break; \
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default: break; \
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} \
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__mask & __eax; \
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})
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#define ____PVOP_CALL(ret, op, call_clbr, extra_clbr, ...) \
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({ \
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PVOP_CALL_ARGS; \
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PVOP_TEST_NULL(op); \
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asm volatile(paravirt_alt(PARAVIRT_CALL) \
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: call_clbr, ASM_CALL_CONSTRAINT \
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: paravirt_type(op), \
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##__VA_ARGS__ \
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: "memory", "cc" extra_clbr); \
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ret; \
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})
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#define ____PVOP_ALT_CALL(ret, op, alt, cond, call_clbr, \
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extra_clbr, ...) \
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({ \
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PVOP_CALL_ARGS; \
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PVOP_TEST_NULL(op); \
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asm volatile(ALTERNATIVE(paravirt_alt(PARAVIRT_CALL), \
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alt, cond) \
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: call_clbr, ASM_CALL_CONSTRAINT \
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: paravirt_type(op), \
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##__VA_ARGS__ \
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: "memory", "cc" extra_clbr); \
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ret; \
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})
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#define __PVOP_CALL(rettype, op, ...) \
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____PVOP_CALL(PVOP_RETVAL(rettype), op, \
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PVOP_CALL_CLOBBERS, EXTRA_CLOBBERS, ##__VA_ARGS__)
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#define __PVOP_ALT_CALL(rettype, op, alt, cond, ...) \
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____PVOP_ALT_CALL(PVOP_RETVAL(rettype), op, alt, cond, \
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PVOP_CALL_CLOBBERS, EXTRA_CLOBBERS, \
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##__VA_ARGS__)
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#define __PVOP_CALLEESAVE(rettype, op, ...) \
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____PVOP_CALL(PVOP_RETVAL(rettype), op.func, \
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PVOP_CALLEE_CLOBBERS, , ##__VA_ARGS__)
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#define __PVOP_ALT_CALLEESAVE(rettype, op, alt, cond, ...) \
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____PVOP_ALT_CALL(PVOP_RETVAL(rettype), op.func, alt, cond, \
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PVOP_CALLEE_CLOBBERS, , ##__VA_ARGS__)
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#define __PVOP_VCALL(op, ...) \
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(void)____PVOP_CALL(, op, PVOP_VCALL_CLOBBERS, \
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VEXTRA_CLOBBERS, ##__VA_ARGS__)
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#define __PVOP_ALT_VCALL(op, alt, cond, ...) \
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(void)____PVOP_ALT_CALL(, op, alt, cond, \
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PVOP_VCALL_CLOBBERS, VEXTRA_CLOBBERS, \
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##__VA_ARGS__)
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#define __PVOP_VCALLEESAVE(op, ...) \
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(void)____PVOP_CALL(, op.func, \
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PVOP_VCALLEE_CLOBBERS, , ##__VA_ARGS__)
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#define __PVOP_ALT_VCALLEESAVE(op, alt, cond, ...) \
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(void)____PVOP_ALT_CALL(, op.func, alt, cond, \
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PVOP_VCALLEE_CLOBBERS, , ##__VA_ARGS__)
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#define PVOP_CALL0(rettype, op) \
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__PVOP_CALL(rettype, op)
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#define PVOP_VCALL0(op) \
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__PVOP_VCALL(op)
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#define PVOP_ALT_CALL0(rettype, op, alt, cond) \
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__PVOP_ALT_CALL(rettype, op, alt, cond)
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#define PVOP_ALT_VCALL0(op, alt, cond) \
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__PVOP_ALT_VCALL(op, alt, cond)
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#define PVOP_CALLEE0(rettype, op) \
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__PVOP_CALLEESAVE(rettype, op)
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#define PVOP_VCALLEE0(op) \
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__PVOP_VCALLEESAVE(op)
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#define PVOP_ALT_CALLEE0(rettype, op, alt, cond) \
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__PVOP_ALT_CALLEESAVE(rettype, op, alt, cond)
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#define PVOP_ALT_VCALLEE0(op, alt, cond) \
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__PVOP_ALT_VCALLEESAVE(op, alt, cond)
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#define PVOP_CALL1(rettype, op, arg1) \
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__PVOP_CALL(rettype, op, PVOP_CALL_ARG1(arg1))
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#define PVOP_VCALL1(op, arg1) \
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__PVOP_VCALL(op, PVOP_CALL_ARG1(arg1))
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#define PVOP_ALT_VCALL1(op, arg1, alt, cond) \
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__PVOP_ALT_VCALL(op, alt, cond, PVOP_CALL_ARG1(arg1))
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#define PVOP_CALLEE1(rettype, op, arg1) \
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__PVOP_CALLEESAVE(rettype, op, PVOP_CALL_ARG1(arg1))
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#define PVOP_VCALLEE1(op, arg1) \
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__PVOP_VCALLEESAVE(op, PVOP_CALL_ARG1(arg1))
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#define PVOP_ALT_CALLEE1(rettype, op, arg1, alt, cond) \
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__PVOP_ALT_CALLEESAVE(rettype, op, alt, cond, PVOP_CALL_ARG1(arg1))
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#define PVOP_ALT_VCALLEE1(op, arg1, alt, cond) \
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__PVOP_ALT_VCALLEESAVE(op, alt, cond, PVOP_CALL_ARG1(arg1))
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#define PVOP_CALL2(rettype, op, arg1, arg2) \
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__PVOP_CALL(rettype, op, PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2))
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#define PVOP_VCALL2(op, arg1, arg2) \
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__PVOP_VCALL(op, PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2))
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#define PVOP_CALL3(rettype, op, arg1, arg2, arg3) \
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__PVOP_CALL(rettype, op, PVOP_CALL_ARG1(arg1), \
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PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
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#define PVOP_VCALL3(op, arg1, arg2, arg3) \
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__PVOP_VCALL(op, PVOP_CALL_ARG1(arg1), \
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PVOP_CALL_ARG2(arg2), PVOP_CALL_ARG3(arg3))
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#define PVOP_CALL4(rettype, op, arg1, arg2, arg3, arg4) \
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__PVOP_CALL(rettype, op, \
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PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
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PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
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#define PVOP_VCALL4(op, arg1, arg2, arg3, arg4) \
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__PVOP_VCALL(op, PVOP_CALL_ARG1(arg1), PVOP_CALL_ARG2(arg2), \
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PVOP_CALL_ARG3(arg3), PVOP_CALL_ARG4(arg4))
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void _paravirt_nop(void);
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|
void paravirt_BUG(void);
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|
unsigned long paravirt_ret0(void);
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|
#ifdef CONFIG_PARAVIRT_XXL
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|
u64 _paravirt_ident_64(u64);
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|
unsigned long pv_native_save_fl(void);
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|
void pv_native_irq_disable(void);
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|
void pv_native_irq_enable(void);
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|
unsigned long pv_native_read_cr2(void);
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|
#endif
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|
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#define paravirt_nop ((void *)_paravirt_nop)
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|
extern struct paravirt_patch_site __parainstructions[],
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|
__parainstructions_end[];
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|
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#endif /* __ASSEMBLY__ */
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|
#endif /* CONFIG_PARAVIRT */
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|
#endif /* _ASM_X86_PARAVIRT_TYPES_H */
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