include/asm-x86/xen/interface.h

   1 /******************************************************************************
   2  * arch-x86_32.h
   3  *
   4  * Guest OS interface to x86 32-bit Xen.
   5  *
   6  * Copyright (c) 2004, K A Fraser
   7  */
   8
   9 #ifndef __XEN_PUBLIC_ARCH_X86_32_H__
  10 #define __XEN_PUBLIC_ARCH_X86_32_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 #ifndef __ASSEMBLY__
  26 /* Guest handles for primitive C types. */
  27 __DEFINE_GUEST_HANDLE(uchar, unsigned char);
  28 __DEFINE_GUEST_HANDLE(uint,  unsigned int);
  29 __DEFINE_GUEST_HANDLE(ulong, unsigned long);
  30 DEFINE_GUEST_HANDLE(char);
  31 DEFINE_GUEST_HANDLE(int);
  32 DEFINE_GUEST_HANDLE(long);
  33 DEFINE_GUEST_HANDLE(void);
  34 #endif
  35
  36 /*
  37  * SEGMENT DESCRIPTOR TABLES
  38  */
  39 /*
  40  * A number of GDT entries are reserved by Xen. These are not situated at the
  41  * start of the GDT because some stupid OSes export hard-coded selector values
  42  * in their ABI. These hard-coded values are always near the start of the GDT,
  43  * so Xen places itself out of the way, at the far end of the GDT.
  44  */
  45 #define FIRST_RESERVED_GDT_PAGE  14
  46 #define FIRST_RESERVED_GDT_BYTE  (FIRST_RESERVED_GDT_PAGE * 4096)
  47 #define FIRST_RESERVED_GDT_ENTRY (FIRST_RESERVED_GDT_BYTE / 8)
  48
  49 /*
  50  * These flat segments are in the Xen-private section of every GDT. Since these
  51  * are also present in the initial GDT, many OSes will be able to avoid
  52  * installing their own GDT.
  53  */
  54 #define FLAT_RING1_CS 0xe019    /* GDT index 259 */
  55 #define FLAT_RING1_DS 0xe021    /* GDT index 260 */
  56 #define FLAT_RING1_SS 0xe021    /* GDT index 260 */
  57 #define FLAT_RING3_CS 0xe02b    /* GDT index 261 */
  58 #define FLAT_RING3_DS 0xe033    /* GDT index 262 */
  59 #define FLAT_RING3_SS 0xe033    /* GDT index 262 */
  60
  61 #define FLAT_KERNEL_CS FLAT_RING1_CS
  62 #define FLAT_KERNEL_DS FLAT_RING1_DS
  63 #define FLAT_KERNEL_SS FLAT_RING1_SS
  64 #define FLAT_USER_CS    FLAT_RING3_CS
  65 #define FLAT_USER_DS    FLAT_RING3_DS
  66 #define FLAT_USER_SS    FLAT_RING3_SS
  67
  68 /* And the trap vector is... */
  69 #define TRAP_INSTR "int $0x82"
  70
  71 /*
  72  * Virtual addresses beyond this are not modifiable by guest OSes. The
  73  * machine->physical mapping table starts at this address, read-only.
  74  */
  75 #ifdef CONFIG_X86_PAE
  76 #define __HYPERVISOR_VIRT_START 0xF5800000
  77 #else
  78 #define __HYPERVISOR_VIRT_START 0xFC000000
  79 #endif
  80
  81 #ifndef HYPERVISOR_VIRT_START
  82 #define HYPERVISOR_VIRT_START mk_unsigned_long(__HYPERVISOR_VIRT_START)
  83 #endif
  84
  85 #ifndef machine_to_phys_mapping
  86 #define machine_to_phys_mapping ((unsigned long *)HYPERVISOR_VIRT_START)
  87 #endif
  88
  89 /* Maximum number of virtual CPUs in multi-processor guests. */
  90 #define MAX_VIRT_CPUS 32
  91
  92 #ifndef __ASSEMBLY__
  93
  94 /*
  95  * Send an array of these to HYPERVISOR_set_trap_table()
  96  */
  97 #define TI_GET_DPL(_ti)         ((_ti)->flags & 3)
  98 #define TI_GET_IF(_ti)          ((_ti)->flags & 4)
  99 #define TI_SET_DPL(_ti, _dpl)   ((_ti)->flags |= (_dpl))
 100 #define TI_SET_IF(_ti, _if)     ((_ti)->flags |= ((!!(_if))<<2))
 101
 102 struct 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 };
 108 DEFINE_GUEST_HANDLE_STRUCT(trap_info);
 109
 110 struct cpu_user_regs {
 111     uint32_t ebx;
 112     uint32_t ecx;
 113     uint32_t edx;
 114     uint32_t esi;
 115     uint32_t edi;
 116     uint32_t ebp;
 117     uint32_t eax;
 118     uint16_t error_code;    /* private */
 119     uint16_t entry_vector;  /* private */
 120     uint32_t eip;
 121     uint16_t cs;
 122     uint8_t  saved_upcall_mask;
 123     uint8_t  _pad0;
 124     uint32_t eflags;        /* eflags.IF == !saved_upcall_mask */
 125     uint32_t esp;
 126     uint16_t ss, _pad1;
 127     uint16_t es, _pad2;
 128     uint16_t ds, _pad3;
 129     uint16_t fs, _pad4;
 130     uint16_t gs, _pad5;
 131 };
 132 DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs);
 133
 134 typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */
 135
 136 /*
 137  * The following is all CPU context. Note that the fpu_ctxt block is filled
 138  * in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used.
 139  */
 140 struct vcpu_guest_context {
 141     /* FPU registers come first so they can be aligned for FXSAVE/FXRSTOR. */
 142     struct { char x[512]; } fpu_ctxt;       /* User-level FPU registers     */
 143 #define VGCF_I387_VALID (1<<0)
 144 #define VGCF_HVM_GUEST  (1<<1)
 145 #define VGCF_IN_KERNEL  (1<<2)
 146     unsigned long flags;                    /* VGCF_* flags                 */
 147     struct cpu_user_regs user_regs;         /* User-level CPU registers     */
 148     struct trap_info trap_ctxt[256];        /* Virtual IDT                  */
 149     unsigned long ldt_base, ldt_ents;       /* LDT (linear address, # ents) */
 150     unsigned long gdt_frames[16], gdt_ents; /* GDT (machine frames, # ents) */
 151     unsigned long kernel_ss, kernel_sp;     /* Virtual TSS (only SS1/SP1)   */
 152     unsigned long ctrlreg[8];               /* CR0-CR7 (control registers)  */
 153     unsigned long debugreg[8];              /* DB0-DB7 (debug registers)    */
 154     unsigned long event_callback_cs;        /* CS:EIP of event callback     */
 155     unsigned long event_callback_eip;
 156     unsigned long failsafe_callback_cs;     /* CS:EIP of failsafe callback  */
 157     unsigned long failsafe_callback_eip;
 158     unsigned long vm_assist;                /* VMASST_TYPE_* bitmap */
 159 };
 160 DEFINE_GUEST_HANDLE_STRUCT(vcpu_guest_context);
 161
 162 struct arch_shared_info {
 163     unsigned long max_pfn;                  /* max pfn that appears in table */
 164     /* Frame containing list of mfns containing list of mfns containing p2m. */
 165     unsigned long pfn_to_mfn_frame_list_list;
 166     unsigned long nmi_reason;
 167 };
 168
 169 struct arch_vcpu_info {
 170     unsigned long cr2;
 171     unsigned long pad[5]; /* sizeof(struct vcpu_info) == 64 */
 172 };
 173
 174 #endif /* !__ASSEMBLY__ */
 175
 176 /*
 177  * Prefix forces emulation of some non-trapping instructions.
 178  * Currently only CPUID.
 179  */
 180 #ifdef __ASSEMBLY__
 181 #define XEN_EMULATE_PREFIX .byte 0x0f,0x0b,0x78,0x65,0x6e ;
 182 #define XEN_CPUID          XEN_EMULATE_PREFIX cpuid
 183 #else
 184 #define XEN_EMULATE_PREFIX ".byte 0x0f,0x0b,0x78,0x65,0x6e ; "
 185 #define XEN_CPUID          XEN_EMULATE_PREFIX "cpuid"
 186 #endif
 187
 188 #endif