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

   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
  82struct 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
  99struct 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};
 129DEFINE_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
 136struct arch_vcpu_info {
 137    unsigned long cr2;
 138    unsigned long pad; /* sizeof(vcpu_info_t) == 64 */
 139};
 140
 141typedef 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 */
 150