LXR linux/arch/x86/include/asm/xen/interface.h

   1/******************************************************************************
   2 * arch-x86_32.h
   3 *
   4 * Guest OS interface to x86 Xen.
   5 *
   6 * Copyright (c) 2004, K A Fraser
   7 */
   8
   9#ifndef _ASM_X86_XEN_INTERFACE_H
  10#define _ASM_X86_XEN_INTERFACE_H
  11
  12#ifdef __XEN__
  13#define __DEFINE_GUEST_HANDLE(name, type) \
  14    typedef struct { type *p; } __guest_handle_ ## name
  15#else
  16#define __DEFINE_GUEST_HANDLE(name, type) \
  17    typedef type * __guest_handle_ ## name
  18#endif
  19
  20#define DEFINE_GUEST_HANDLE_STRUCT(name) \
  21        __DEFINE_GUEST_HANDLE(name, struct name)
  22#define DEFINE_GUEST_HANDLE(name) __DEFINE_GUEST_HANDLE(name, name)
  23#define GUEST_HANDLE(name)        __guest_handle_ ## name
  24
  25#ifdef __XEN__
  26#if defined(__i386__)
  27#define set_xen_guest_handle(hnd, val)                  \
  28        do {                                            \
  29                if (sizeof(hnd) == 8)                   \
  30                        *(uint64_t *)&(hnd) = 0;        \
  31                (hnd).p = val;                          \
  32        } while (0)
  33#elif defined(__x86_64__)
  34#define set_xen_guest_handle(hnd, val)  do { (hnd).p = val; } while (0)
  35#endif
  36#else
  37#if defined(__i386__)
  38#define set_xen_guest_handle(hnd, val)                  \
  39        do {                                            \
  40                if (sizeof(hnd) == 8)                   \
  41                        *(uint64_t *)&(hnd) = 0;        \
  42                (hnd) = val;                            \
  43        } while (0)
  44#elif defined(__x86_64__)
  45#define set_xen_guest_handle(hnd, val)  do { (hnd) = val; } while (0)
  46#endif
  47#endif
  48
  49#ifndef __ASSEMBLY__
  50/* Guest handles for primitive C types. */
  51__DEFINE_GUEST_HANDLE(uchar, unsigned char);
  52__DEFINE_GUEST_HANDLE(uint,  unsigned int);
  53__DEFINE_GUEST_HANDLE(ulong, unsigned long);
  54DEFINE_GUEST_HANDLE(char);
  55DEFINE_GUEST_HANDLE(int);
  56DEFINE_GUEST_HANDLE(long);
  57DEFINE_GUEST_HANDLE(void);
  58DEFINE_GUEST_HANDLE(uint64_t);
  59DEFINE_GUEST_HANDLE(uint32_t);
  60#endif
  61
  62#ifndef HYPERVISOR_VIRT_START
  63#define HYPERVISOR_VIRT_START mk_unsigned_long(__HYPERVISOR_VIRT_START)
  64#endif
  65
  66#define MACH2PHYS_VIRT_START  mk_unsigned_long(__MACH2PHYS_VIRT_START)
  67#define MACH2PHYS_VIRT_END    mk_unsigned_long(__MACH2PHYS_VIRT_END)
  68#define MACH2PHYS_NR_ENTRIES  ((MACH2PHYS_VIRT_END-MACH2PHYS_VIRT_START)>>__MACH2PHYS_SHIFT)
  69
  70/* Maximum number of virtual CPUs in multi-processor guests. */
  71#define MAX_VIRT_CPUS 32
  72
  73/*
  74 * SEGMENT DESCRIPTOR TABLES
  75 */
  76/*
  77 * A number of GDT entries are reserved by Xen. These are not situated at the
  78 * start of the GDT because some stupid OSes export hard-coded selector values
  79 * in their ABI. These hard-coded values are always near the start of the GDT,
  80 * so Xen places itself out of the way, at the far end of the GDT.
  81 */
  82#define FIRST_RESERVED_GDT_PAGE  14
  83#define FIRST_RESERVED_GDT_BYTE  (FIRST_RESERVED_GDT_PAGE * 4096)
  84#define FIRST_RESERVED_GDT_ENTRY (FIRST_RESERVED_GDT_BYTE / 8)
  85
  86/*
  87 * Send an array of these to HYPERVISOR_set_trap_table()
  88 * The privilege level specifies which modes may enter a trap via a software
  89 * interrupt. On x86/64, since rings 1 and 2 are unavailable, we allocate
  90 * privilege levels as follows:
  91 *  Level == 0: No one may enter
  92 *  Level == 1: Kernel may enter
  93 *  Level == 2: Kernel may enter
  94 *  Level == 3: Everyone may enter
  95 */
  96#define TI_GET_DPL(_ti)         ((_ti)->flags & 3)
  97#define TI_GET_IF(_ti)          ((_ti)->flags & 4)
  98#define TI_SET_DPL(_ti, _dpl)   ((_ti)->flags |= (_dpl))
  99#define TI_SET_IF(_ti, _if)     ((_ti)->flags |= ((!!(_if))<<2))
 100
 101#ifndef __ASSEMBLY__
 102struct trap_info {
 103    uint8_t       vector;  /* exception vector                              */
 104    uint8_t       flags;   /* 0-3: privilege level; 4: clear event enable?  */
 105    uint16_t      cs;      /* code selector                                 */
 106    unsigned long address; /* code offset                                   */
 107};
 108DEFINE_GUEST_HANDLE_STRUCT(trap_info);
 109
 110struct arch_shared_info {
 111    unsigned long max_pfn;                  /* max pfn that appears in table */
 112    /* Frame containing list of mfns containing list of mfns containing p2m. */
 113    unsigned long pfn_to_mfn_frame_list_list;
 114    unsigned long nmi_reason;
 115};
 116#endif  /* !__ASSEMBLY__ */
 117
 118#ifdef CONFIG_X86_32
 119#include "interface_32.h"
 120#else
 121#include "interface_64.h"
 122#endif
 123
 124#ifndef __ASSEMBLY__
 125/*
 126 * The following is all CPU context. Note that the fpu_ctxt block is filled
 127 * in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used.
 128 */
 129struct vcpu_guest_context {
 130    /* FPU registers come first so they can be aligned for FXSAVE/FXRSTOR. */
 131    struct { char x[512]; } fpu_ctxt;       /* User-level FPU registers     */
 132#define VGCF_I387_VALID (1<<0)
 133#define VGCF_HVM_GUEST  (1<<1)
 134#define VGCF_IN_KERNEL  (1<<2)
 135    unsigned long flags;                    /* VGCF_* flags                 */
 136    struct cpu_user_regs user_regs;         /* User-level CPU registers     */
 137    struct trap_info trap_ctxt[256];        /* Virtual IDT                  */
 138    unsigned long ldt_base, ldt_ents;       /* LDT (linear address, # ents) */
 139    unsigned long gdt_frames[16], gdt_ents; /* GDT (machine frames, # ents) */
 140    unsigned long kernel_ss, kernel_sp;     /* Virtual TSS (only SS1/SP1)   */
 141    /* NB. User pagetable on x86/64 is placed in ctrlreg[1]. */
 142    unsigned long ctrlreg[8];               /* CR0-CR7 (control registers)  */
 143    unsigned long debugreg[8];              /* DB0-DB7 (debug registers)    */
 144#ifdef __i386__
 145    unsigned long event_callback_cs;        /* CS:EIP of event callback     */
 146    unsigned long event_callback_eip;
 147    unsigned long failsafe_callback_cs;     /* CS:EIP of failsafe callback  */
 148    unsigned long failsafe_callback_eip;
 149#else
 150    unsigned long event_callback_eip;
 151    unsigned long failsafe_callback_eip;
 152    unsigned long syscall_callback_eip;
 153#endif
 154    unsigned long vm_assist;                /* VMASST_TYPE_* bitmap */
 155#ifdef __x86_64__
 156    /* Segment base addresses. */
 157    uint64_t      fs_base;
 158    uint64_t      gs_base_kernel;
 159    uint64_t      gs_base_user;
 160#endif
 161};
 162DEFINE_GUEST_HANDLE_STRUCT(vcpu_guest_context);
 163#endif  /* !__ASSEMBLY__ */
 164
 165/*
 166 * Prefix forces emulation of some non-trapping instructions.
 167 * Currently only CPUID.
 168 */
 169#ifdef __ASSEMBLY__
 170#define XEN_EMULATE_PREFIX .byte 0x0f,0x0b,0x78,0x65,0x6e ;
 171#define XEN_CPUID          XEN_EMULATE_PREFIX cpuid
 172#else
 173#define XEN_EMULATE_PREFIX ".byte 0x0f,0x0b,0x78,0x65,0x6e ; "
 174#define XEN_CPUID          XEN_EMULATE_PREFIX "cpuid"
 175#endif
 176
 177#endif /* _ASM_X86_XEN_INTERFACE_H */
 178