summaryrefslogtreecommitdiffstats
path: root/arch/x86/include/asm/xen/interface_64.h
blob: 21373e7a7dd5a209809725b9f3c107cc2538090a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
#ifndef _ASM_X86_XEN__INTERFACE_64_H
#define _ASM_X86_XEN__INTERFACE_64_H

/*
 * 64-bit segment selectors
 * These flat segments are in the Xen-private section of every GDT. Since these
 * are also present in the initial GDT, many OSes will be able to avoid
 * installing their own GDT.
 */

#define FLAT_RING3_CS32 0xe023  /* GDT index 260 */
#define FLAT_RING3_CS64 0xe033  /* GDT index 261 */
#define FLAT_RING3_DS32 0xe02b  /* GDT index 262 */
#define FLAT_RING3_DS64 0x0000  /* NULL selector */
#define FLAT_RING3_SS32 0xe02b  /* GDT index 262 */
#define FLAT_RING3_SS64 0xe02b  /* GDT index 262 */

#define FLAT_KERNEL_DS64 FLAT_RING3_DS64
#define FLAT_KERNEL_DS32 FLAT_RING3_DS32
#define FLAT_KERNEL_DS   FLAT_KERNEL_DS64
#define FLAT_KERNEL_CS64 FLAT_RING3_CS64
#define FLAT_KERNEL_CS32 FLAT_RING3_CS32
#define FLAT_KERNEL_CS   FLAT_KERNEL_CS64
#define FLAT_KERNEL_SS64 FLAT_RING3_SS64
#define FLAT_KERNEL_SS32 FLAT_RING3_SS32
#define FLAT_KERNEL_SS   FLAT_KERNEL_SS64

#define FLAT_USER_DS64 FLAT_RING3_DS64
#define FLAT_USER_DS32 FLAT_RING3_DS32
#define FLAT_USER_DS   FLAT_USER_DS64
#define FLAT_USER_CS64 FLAT_RING3_CS64
#define FLAT_USER_CS32 FLAT_RING3_CS32
#define FLAT_USER_CS   FLAT_USER_CS64
#define FLAT_USER_SS64 FLAT_RING3_SS64
#define FLAT_USER_SS32 FLAT_RING3_SS32
#define FLAT_USER_SS   FLAT_USER_SS64

#define __HYPERVISOR_VIRT_START 0xFFFF800000000000
#define __HYPERVISOR_VIRT_END   0xFFFF880000000000
#define __MACH2PHYS_VIRT_START  0xFFFF800000000000
#define __MACH2PHYS_VIRT_END    0xFFFF804000000000

#ifndef HYPERVISOR_VIRT_START
#define HYPERVISOR_VIRT_START mk_unsigned_long(__HYPERVISOR_VIRT_START)
#define HYPERVISOR_VIRT_END   mk_unsigned_long(__HYPERVISOR_VIRT_END)
#endif

#define MACH2PHYS_VIRT_START  mk_unsigned_long(__MACH2PHYS_VIRT_START)
#define MACH2PHYS_VIRT_END    mk_unsigned_long(__MACH2PHYS_VIRT_END)
#define MACH2PHYS_NR_ENTRIES  ((MACH2PHYS_VIRT_END-MACH2PHYS_VIRT_START)>>3)
#ifndef machine_to_phys_mapping
#define machine_to_phys_mapping ((unsigned long *)HYPERVISOR_VIRT_START)
#endif

/*
 * int HYPERVISOR_set_segment_base(unsigned int which, unsigned long base)
 *  @which == SEGBASE_*  ;  @base == 64-bit base address
 * Returns 0 on success.
 */
#define SEGBASE_FS          0
#define SEGBASE_GS_USER     1
#define SEGBASE_GS_KERNEL   2
#define SEGBASE_GS_USER_SEL 3 /* Set user %gs specified in base[15:0] */

/*
 * int HYPERVISOR_iret(void)
 * All arguments are on the kernel stack, in the following format.
 * Never returns if successful. Current kernel context is lost.
 * The saved CS is mapped as follows:
 *   RING0 -> RING3 kernel mode.
 *   RING1 -> RING3 kernel mode.
 *   RING2 -> RING3 kernel mode.
 *   RING3 -> RING3 user mode.
 * However RING0 indicates that the guest kernel should return to iteself
 * directly with
 *      orb   $3,1*8(%rsp)
 *      iretq
 * If flags contains VGCF_in_syscall:
 *   Restore RAX, RIP, RFLAGS, RSP.
 *   Discard R11, RCX, CS, SS.
 * Otherwise:
 *   Restore RAX, R11, RCX, CS:RIP, RFLAGS, SS:RSP.
 * All other registers are saved on hypercall entry and restored to user.
 */
/* Guest exited in SYSCALL context? Return to guest with SYSRET? */
#define _VGCF_in_syscall 8
#define VGCF_in_syscall  (1<<_VGCF_in_syscall)
#define VGCF_IN_SYSCALL  VGCF_in_syscall

#ifndef __ASSEMBLY__

struct iret_context {
    /* Top of stack (%rsp at point of hypercall). */
    uint64_t rax, r11, rcx, flags, rip, cs, rflags, rsp, ss;
    /* Bottom of iret stack frame. */
};

#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
/* Anonymous union includes both 32- and 64-bit names (e.g., eax/rax). */
#define __DECL_REG(name) union { \
    uint64_t r ## name, e ## name; \
    uint32_t _e ## name; \
}
#else
/* Non-gcc sources must always use the proper 64-bit name (e.g., rax). */
#define __DECL_REG(name) uint64_t r ## name
#endif

struct cpu_user_regs {
    uint64_t r15;
    uint64_t r14;
    uint64_t r13;
    uint64_t r12;
    __DECL_REG(bp);
    __DECL_REG(bx);
    uint64_t r11;
    uint64_t r10;
    uint64_t r9;
    uint64_t r8;
    __DECL_REG(ax);
    __DECL_REG(cx);
    __DECL_REG(dx);
    __DECL_REG(si);
    __DECL_REG(di);
    uint32_t error_code;    /* private */
    uint32_t entry_vector;  /* private */
    __DECL_REG(ip);
    uint16_t cs, _pad0[1];
    uint8_t  saved_upcall_mask;
    uint8_t  _pad1[3];
    __DECL_REG(flags);      /* rflags.IF == !saved_upcall_mask */
    __DECL_REG(sp);
    uint16_t ss, _pad2[3];
    uint16_t es, _pad3[3];
    uint16_t ds, _pad4[3];
    uint16_t fs, _pad5[3]; /* Non-zero => takes precedence over fs_base.     */
    uint16_t gs, _pad6[3]; /* Non-zero => takes precedence over gs_base_usr. */
};
DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs);

#undef __DECL_REG

#define xen_pfn_to_cr3(pfn) ((unsigned long)(pfn) << 12)
#define xen_cr3_to_pfn(cr3) ((unsigned long)(cr3) >> 12)

struct arch_vcpu_info {
    unsigned long cr2;
    unsigned long pad; /* sizeof(vcpu_info_t) == 64 */
};

typedef unsigned long xen_callback_t;

#define XEN_CALLBACK(__cs, __rip)				\
	((unsigned long)(__rip))

#endif /* !__ASSEMBLY__ */


#endif /* _ASM_X86_XEN__INTERFACE_64_H */