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

   1#ifndef _ASM_X86_XEN_INTERFACE_64_H
   2#define _ASM_X86_XEN_INTERFACE_64_H
   3
   4/*
   5 * 64-bit segment selectors
   6 * These flat segments are in the Xen-private section of every GDT. Since these
   7 * are also present in the initial GDT, many OSes will be able to avoid
   8 * installing their own GDT.
   9 */
  10
  11#define FLAT_RING3_CS32 0xe023  /* GDT index 260 */
  12#define FLAT_RING3_CS64 0xe033  /* GDT index 261 */
  13#define FLAT_RING3_DS32 0xe02b  /* GDT index 262 */
  14#define FLAT_RING3_DS64 0x0000  /* NULL selector */
  15#define FLAT_RING3_SS32 0xe02b  /* GDT index 262 */
  16#define FLAT_RING3_SS64 0xe02b  /* GDT index 262 */
  17
  18#define FLAT_KERNEL_DS64 FLAT_RING3_DS64
  19#define FLAT_KERNEL_DS32 FLAT_RING3_DS32
  20#define FLAT_KERNEL_DS   FLAT_KERNEL_DS64
  21#define FLAT_KERNEL_CS64 FLAT_RING3_CS64
  22#define FLAT_KERNEL_CS32 FLAT_RING3_CS32
  23#define FLAT_KERNEL_CS   FLAT_KERNEL_CS64
  24#define FLAT_KERNEL_SS64 FLAT_RING3_SS64
  25#define FLAT_KERNEL_SS32 FLAT_RING3_SS32
  26#define FLAT_KERNEL_SS   FLAT_KERNEL_SS64
  27
  28#define FLAT_USER_DS64 FLAT_RING3_DS64
  29#define FLAT_USER_DS32 FLAT_RING3_DS32
  30#define FLAT_USER_DS   FLAT_USER_DS64
  31#define FLAT_USER_CS64 FLAT_RING3_CS64
  32#define FLAT_USER_CS32 FLAT_RING3_CS32
  33#define FLAT_USER_CS   FLAT_USER_CS64
  34#define FLAT_USER_SS64 FLAT_RING3_SS64
  35#define FLAT_USER_SS32 FLAT_RING3_SS32
  36#define FLAT_USER_SS   FLAT_USER_SS64
  37
  38#define __HYPERVISOR_VIRT_START 0xFFFF800000000000
  39#define __HYPERVISOR_VIRT_END   0xFFFF880000000000
  40#define __MACH2PHYS_VIRT_START  0xFFFF800000000000
  41#define __MACH2PHYS_VIRT_END    0xFFFF804000000000
  42#define __MACH2PHYS_SHIFT       3
  43
  44/*
  45 * int HYPERVISOR_set_segment_base(unsigned int which, unsigned long base)
  46 *  @which == SEGBASE_*  ;  @base == 64-bit base address
  47 * Returns 0 on success.
  48 */
  49#define SEGBASE_FS          0
  50#define SEGBASE_GS_USER     1
  51#define SEGBASE_GS_KERNEL   2
  52#define SEGBASE_GS_USER_SEL 3 /* Set user %gs specified in base[15:0] */
  53
  54/*
  55 * int HYPERVISOR_iret(void)
  56 * All arguments are on the kernel stack, in the following format.
  57 * Never returns if successful. Current kernel context is lost.
  58 * The saved CS is mapped as follows:
  59 *   RING0 -> RING3 kernel mode.
  60 *   RING1 -> RING3 kernel mode.
  61 *   RING2 -> RING3 kernel mode.
  62 *   RING3 -> RING3 user mode.
  63 * However RING0 indicates that the guest kernel should return to iteself
  64 * directly with
  65 *      orb   $3,1*8(%rsp)
  66 *      iretq
  67 * If flags contains VGCF_in_syscall:
  68 *   Restore RAX, RIP, RFLAGS, RSP.
  69 *   Discard R11, RCX, CS, SS.
  70 * Otherwise:
  71 *   Restore RAX, R11, RCX, CS:RIP, RFLAGS, SS:RSP.
  72 * All other registers are saved on hypercall entry and restored to user.
  73 */
  74/* Guest exited in SYSCALL context? Return to guest with SYSRET? */
  75#define _VGCF_in_syscall 8
  76#define VGCF_in_syscall  (1<<_VGCF_in_syscall)
  77#define VGCF_IN_SYSCALL  VGCF_in_syscall
  78
  79#ifndef __ASSEMBLY__
  80
  81struct iret_context {
  82    /* Top of stack (%rsp at point of hypercall). */
  83    uint64_t rax, r11, rcx, flags, rip, cs, rflags, rsp, ss;
  84    /* Bottom of iret stack frame. */
  85};
  86
  87#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
  88/* Anonymous union includes both 32- and 64-bit names (e.g., eax/rax). */
  89#define __DECL_REG(name) union { \
  90    uint64_t r ## name, e ## name; \
  91    uint32_t _e ## name; \
  92}
  93#else
  94/* Non-gcc sources must always use the proper 64-bit name (e.g., rax). */
  95#define __DECL_REG(name) uint64_t r ## name
  96#endif
  97
  98struct cpu_user_regs {
  99    uint64_t r15;
 100    uint64_t r14;
 101    uint64_t r13;
 102    uint64_t r12;
 103    __DECL_REG(bp);
 104    __DECL_REG(bx);
 105    uint64_t r11;
 106    uint64_t r10;
 107    uint64_t r9;
 108    uint64_t r8;
 109    __DECL_REG(ax);
 110    __DECL_REG(cx);
 111    __DECL_REG(dx);
 112    __DECL_REG(si);
 113    __DECL_REG(di);
 114    uint32_t error_code;    /* private */
 115    uint32_t entry_vector;  /* private */
 116    __DECL_REG(ip);
 117    uint16_t cs, _pad0[1];
 118    uint8_t  saved_upcall_mask;
 119    uint8_t  _pad1[3];
 120    __DECL_REG(flags);      /* rflags.IF == !saved_upcall_mask */
 121    __DECL_REG(sp);
 122    uint16_t ss, _pad2[3];
 123    uint16_t es, _pad3[3];
 124    uint16_t ds, _pad4[3];
 125    uint16_t fs, _pad5[3]; /* Non-zero => takes precedence over fs_base.     */
 126    uint16_t gs, _pad6[3]; /* Non-zero => takes precedence over gs_base_usr. */
 127};
 128DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs);
 129
 130#undef __DECL_REG
 131
 132#define xen_pfn_to_cr3(pfn) ((unsigned long)(pfn) << 12)
 133#define xen_cr3_to_pfn(cr3) ((unsigned long)(cr3) >> 12)
 134
 135struct arch_vcpu_info {
 136    unsigned long cr2;
 137    unsigned long pad; /* sizeof(vcpu_info_t) == 64 */
 138};
 139
 140typedef unsigned long xen_callback_t;
 141
 142#define XEN_CALLBACK(__cs, __rip)                               \
 143        ((unsigned long)(__rip))
 144
 145#endif /* !__ASSEMBLY__ */
 146
 147
 148#endif /* _ASM_X86_XEN_INTERFACE_64_H */
 149