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
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