arch/x86/include/asm/xen/interface_64.h

   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
  81 struct 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
  98 struct 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 };
 128 DEFINE_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
 135 struct arch_vcpu_info {
 136     unsigned long cr2;
 137     unsigned long pad; /* sizeof(vcpu_info_t) == 64 */
 138 };
 139
 140 typedef 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 */