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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_XEN_INTERFACE_64_H
   3 #define _ASM_X86_XEN_INTERFACE_64_H
   4
   5 /*
   6  * 64-bit segment selectors
   7  * These flat segments are in the Xen-private section of every GDT. Since these
   8  * are also present in the initial GDT, many OSes will be able to avoid
   9  * installing their own GDT.
  10  */
  11
  12 #define FLAT_RING3_CS32 0xe023  /* GDT index 260 */
  13 #define FLAT_RING3_CS64 0xe033  /* GDT index 261 */
  14 #define FLAT_RING3_DS32 0xe02b  /* GDT index 262 */
  15 #define FLAT_RING3_DS64 0x0000  /* NULL selector */
  16 #define FLAT_RING3_SS32 0xe02b  /* GDT index 262 */
  17 #define FLAT_RING3_SS64 0xe02b  /* GDT index 262 */
  18
  19 #define FLAT_KERNEL_DS64 FLAT_RING3_DS64
  20 #define FLAT_KERNEL_DS32 FLAT_RING3_DS32
  21 #define FLAT_KERNEL_DS   FLAT_KERNEL_DS64
  22 #define FLAT_KERNEL_CS64 FLAT_RING3_CS64
  23 #define FLAT_KERNEL_CS32 FLAT_RING3_CS32
  24 #define FLAT_KERNEL_CS   FLAT_KERNEL_CS64
  25 #define FLAT_KERNEL_SS64 FLAT_RING3_SS64
  26 #define FLAT_KERNEL_SS32 FLAT_RING3_SS32
  27 #define FLAT_KERNEL_SS   FLAT_KERNEL_SS64
  28
  29 #define FLAT_USER_DS64 FLAT_RING3_DS64
  30 #define FLAT_USER_DS32 FLAT_RING3_DS32
  31 #define FLAT_USER_DS   FLAT_USER_DS64
  32 #define FLAT_USER_CS64 FLAT_RING3_CS64
  33 #define FLAT_USER_CS32 FLAT_RING3_CS32
  34 #define FLAT_USER_CS   FLAT_USER_CS64
  35 #define FLAT_USER_SS64 FLAT_RING3_SS64
  36 #define FLAT_USER_SS32 FLAT_RING3_SS32
  37 #define FLAT_USER_SS   FLAT_USER_SS64
  38
  39 #define __HYPERVISOR_VIRT_START 0xFFFF800000000000
  40 #define __HYPERVISOR_VIRT_END   0xFFFF880000000000
  41 #define __MACH2PHYS_VIRT_START  0xFFFF800000000000
  42 #define __MACH2PHYS_VIRT_END    0xFFFF804000000000
  43 #define __MACH2PHYS_SHIFT       3
  44
  45 /*
  46  * int HYPERVISOR_set_segment_base(unsigned int which, unsigned long base)
  47  *  @which == SEGBASE_*  ;  @base == 64-bit base address
  48  * Returns 0 on success.
  49  */
  50 #define SEGBASE_FS          0
  51 #define SEGBASE_GS_USER     1
  52 #define SEGBASE_GS_KERNEL   2
  53 #define SEGBASE_GS_USER_SEL 3 /* Set user %gs specified in base[15:0] */
  54
  55 /*
  56  * int HYPERVISOR_iret(void)
  57  * All arguments are on the kernel stack, in the following format.
  58  * Never returns if successful. Current kernel context is lost.
  59  * The saved CS is mapped as follows:
  60  *   RING0 -> RING3 kernel mode.
  61  *   RING1 -> RING3 kernel mode.
  62  *   RING2 -> RING3 kernel mode.
  63  *   RING3 -> RING3 user mode.
  64  * However RING0 indicates that the guest kernel should return to iteself
  65  * directly with
  66  *      orb   $3,1*8(%rsp)
  67  *      iretq
  68  * If flags contains VGCF_in_syscall:
  69  *   Restore RAX, RIP, RFLAGS, RSP.
  70  *   Discard R11, RCX, CS, SS.
  71  * Otherwise:
  72  *   Restore RAX, R11, RCX, CS:RIP, RFLAGS, SS:RSP.
  73  * All other registers are saved on hypercall entry and restored to user.
  74  */
  75 /* Guest exited in SYSCALL context? Return to guest with SYSRET? */
  76 #define _VGCF_in_syscall 8
  77 #define VGCF_in_syscall  (1<<_VGCF_in_syscall)
  78 #define VGCF_IN_SYSCALL  VGCF_in_syscall
  79
  80 #ifndef __ASSEMBLY__
  81
  82 struct iret_context {
  83     /* Top of stack (%rsp at point of hypercall). */
  84     uint64_t rax, r11, rcx, flags, rip, cs, rflags, rsp, ss;
  85     /* Bottom of iret stack frame. */
  86 };
  87
  88 #if defined(__GNUC__) && !defined(__STRICT_ANSI__)
  89 /* Anonymous union includes both 32- and 64-bit names (e.g., eax/rax). */
  90 #define __DECL_REG(name) union { \
  91     uint64_t r ## name, e ## name; \
  92     uint32_t _e ## name; \
  93 }
  94 #else
  95 /* Non-gcc sources must always use the proper 64-bit name (e.g., rax). */
  96 #define __DECL_REG(name) uint64_t r ## name
  97 #endif
  98
  99 struct cpu_user_regs {
 100     uint64_t r15;
 101     uint64_t r14;
 102     uint64_t r13;
 103     uint64_t r12;
 104     __DECL_REG(bp);
 105     __DECL_REG(bx);
 106     uint64_t r11;
 107     uint64_t r10;
 108     uint64_t r9;
 109     uint64_t r8;
 110     __DECL_REG(ax);
 111     __DECL_REG(cx);
 112     __DECL_REG(dx);
 113     __DECL_REG(si);
 114     __DECL_REG(di);
 115     uint32_t error_code;    /* private */
 116     uint32_t entry_vector;  /* private */
 117     __DECL_REG(ip);
 118     uint16_t cs, _pad0[1];
 119     uint8_t  saved_upcall_mask;
 120     uint8_t  _pad1[3];
 121     __DECL_REG(flags);      /* rflags.IF == !saved_upcall_mask */
 122     __DECL_REG(sp);
 123     uint16_t ss, _pad2[3];
 124     uint16_t es, _pad3[3];
 125     uint16_t ds, _pad4[3];
 126     uint16_t fs, _pad5[3]; /* Non-zero => takes precedence over fs_base.     */
 127     uint16_t gs, _pad6[3]; /* Non-zero => takes precedence over gs_base_usr. */
 128 };
 129 DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs);
 130
 131 #undef __DECL_REG
 132
 133 #define xen_pfn_to_cr3(pfn) ((unsigned long)(pfn) << 12)
 134 #define xen_cr3_to_pfn(cr3) ((unsigned long)(cr3) >> 12)
 135
 136 struct arch_vcpu_info {
 137     unsigned long cr2;
 138     unsigned long pad; /* sizeof(vcpu_info_t) == 64 */
 139 };
 140
 141 typedef unsigned long xen_callback_t;
 142
 143 #define XEN_CALLBACK(__cs, __rip)                               \
 144         ((unsigned long)(__rip))
 145
 146 #endif /* !__ASSEMBLY__ */
 147
 148
 149 #endif /* _ASM_X86_XEN_INTERFACE_64_H */