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 itself
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 */
150
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