1 /******************************************************************************
4 * Guest OS interface to x86 Xen.
6 * Copyright (c) 2004, K A Fraser
9 #ifndef _ASM_X86_XEN_INTERFACE_H
10 #define _ASM_X86_XEN_INTERFACE_H
13 #define __DEFINE_GUEST_HANDLE(name, type) \
14 typedef struct { type *p; } __guest_handle_ ## name
16 #define __DEFINE_GUEST_HANDLE(name, type) \
17 typedef type * __guest_handle_ ## name
20 #define DEFINE_GUEST_HANDLE_STRUCT(name) \
21 __DEFINE_GUEST_HANDLE(name, struct name)
22 #define DEFINE_GUEST_HANDLE(name) __DEFINE_GUEST_HANDLE(name, name)
23 #define GUEST_HANDLE(name) __guest_handle_ ## name
27 #define set_xen_guest_handle(hnd, val) \
29 if (sizeof(hnd) == 8) \
30 *(uint64_t *)&(hnd) = 0; \
33 #elif defined(__x86_64__)
34 #define set_xen_guest_handle(hnd, val) do { (hnd).p = val; } while (0)
38 #define set_xen_guest_handle(hnd, val) \
40 if (sizeof(hnd) == 8) \
41 *(uint64_t *)&(hnd) = 0; \
44 #elif defined(__x86_64__)
45 #define set_xen_guest_handle(hnd, val) do { (hnd) = val; } while (0)
50 /* Guest handles for primitive C types. */
51 __DEFINE_GUEST_HANDLE(uchar
, unsigned char);
52 __DEFINE_GUEST_HANDLE(uint
, unsigned int);
53 __DEFINE_GUEST_HANDLE(ulong
, unsigned long);
54 DEFINE_GUEST_HANDLE(char);
55 DEFINE_GUEST_HANDLE(int);
56 DEFINE_GUEST_HANDLE(long);
57 DEFINE_GUEST_HANDLE(void);
58 DEFINE_GUEST_HANDLE(uint64_t);
59 DEFINE_GUEST_HANDLE(uint32_t);
62 #ifndef HYPERVISOR_VIRT_START
63 #define HYPERVISOR_VIRT_START mk_unsigned_long(__HYPERVISOR_VIRT_START)
66 #define MACH2PHYS_VIRT_START mk_unsigned_long(__MACH2PHYS_VIRT_START)
67 #define MACH2PHYS_VIRT_END mk_unsigned_long(__MACH2PHYS_VIRT_END)
68 #define MACH2PHYS_NR_ENTRIES ((MACH2PHYS_VIRT_END-MACH2PHYS_VIRT_START)>>__MACH2PHYS_SHIFT)
70 /* Maximum number of virtual CPUs in multi-processor guests. */
71 #define MAX_VIRT_CPUS 32
74 * SEGMENT DESCRIPTOR TABLES
77 * A number of GDT entries are reserved by Xen. These are not situated at the
78 * start of the GDT because some stupid OSes export hard-coded selector values
79 * in their ABI. These hard-coded values are always near the start of the GDT,
80 * so Xen places itself out of the way, at the far end of the GDT.
82 #define FIRST_RESERVED_GDT_PAGE 14
83 #define FIRST_RESERVED_GDT_BYTE (FIRST_RESERVED_GDT_PAGE * 4096)
84 #define FIRST_RESERVED_GDT_ENTRY (FIRST_RESERVED_GDT_BYTE / 8)
87 * Send an array of these to HYPERVISOR_set_trap_table()
88 * The privilege level specifies which modes may enter a trap via a software
89 * interrupt. On x86/64, since rings 1 and 2 are unavailable, we allocate
90 * privilege levels as follows:
91 * Level == 0: No one may enter
92 * Level == 1: Kernel may enter
93 * Level == 2: Kernel may enter
94 * Level == 3: Everyone may enter
96 #define TI_GET_DPL(_ti) ((_ti)->flags & 3)
97 #define TI_GET_IF(_ti) ((_ti)->flags & 4)
98 #define TI_SET_DPL(_ti, _dpl) ((_ti)->flags |= (_dpl))
99 #define TI_SET_IF(_ti, _if) ((_ti)->flags |= ((!!(_if))<<2))
103 uint8_t vector
; /* exception vector */
104 uint8_t flags
; /* 0-3: privilege level; 4: clear event enable? */
105 uint16_t cs
; /* code selector */
106 unsigned long address
; /* code offset */
108 DEFINE_GUEST_HANDLE_STRUCT(trap_info
);
110 struct arch_shared_info
{
111 unsigned long max_pfn
; /* max pfn that appears in table */
112 /* Frame containing list of mfns containing list of mfns containing p2m. */
113 unsigned long pfn_to_mfn_frame_list_list
;
114 unsigned long nmi_reason
;
116 #endif /* !__ASSEMBLY__ */
119 #include <asm/xen/interface_32.h>
121 #include <asm/xen/interface_64.h>
126 * The following is all CPU context. Note that the fpu_ctxt block is filled
127 * in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used.
129 struct vcpu_guest_context
{
130 /* FPU registers come first so they can be aligned for FXSAVE/FXRSTOR. */
131 struct { char x
[512]; } fpu_ctxt
; /* User-level FPU registers */
132 #define VGCF_I387_VALID (1<<0)
133 #define VGCF_HVM_GUEST (1<<1)
134 #define VGCF_IN_KERNEL (1<<2)
135 unsigned long flags
; /* VGCF_* flags */
136 struct cpu_user_regs user_regs
; /* User-level CPU registers */
137 struct trap_info trap_ctxt
[256]; /* Virtual IDT */
138 unsigned long ldt_base
, ldt_ents
; /* LDT (linear address, # ents) */
139 unsigned long gdt_frames
[16], gdt_ents
; /* GDT (machine frames, # ents) */
140 unsigned long kernel_ss
, kernel_sp
; /* Virtual TSS (only SS1/SP1) */
141 /* NB. User pagetable on x86/64 is placed in ctrlreg[1]. */
142 unsigned long ctrlreg
[8]; /* CR0-CR7 (control registers) */
143 unsigned long debugreg
[8]; /* DB0-DB7 (debug registers) */
145 unsigned long event_callback_cs
; /* CS:EIP of event callback */
146 unsigned long event_callback_eip
;
147 unsigned long failsafe_callback_cs
; /* CS:EIP of failsafe callback */
148 unsigned long failsafe_callback_eip
;
150 unsigned long event_callback_eip
;
151 unsigned long failsafe_callback_eip
;
152 unsigned long syscall_callback_eip
;
154 unsigned long vm_assist
; /* VMASST_TYPE_* bitmap */
156 /* Segment base addresses. */
158 uint64_t gs_base_kernel
;
159 uint64_t gs_base_user
;
162 DEFINE_GUEST_HANDLE_STRUCT(vcpu_guest_context
);
163 #endif /* !__ASSEMBLY__ */
166 * Prefix forces emulation of some non-trapping instructions.
167 * Currently only CPUID.
170 #define XEN_EMULATE_PREFIX .byte 0x0f,0x0b,0x78,0x65,0x6e ;
171 #define XEN_CPUID XEN_EMULATE_PREFIX cpuid
173 #define XEN_EMULATE_PREFIX ".byte 0x0f,0x0b,0x78,0x65,0x6e ; "
174 #define XEN_CPUID XEN_EMULATE_PREFIX "cpuid"
177 #endif /* _ASM_X86_XEN_INTERFACE_H */