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