xen.h revision 181624
1/****************************************************************************** 2 * arch-x86/xen.h 3 * 4 * Guest OS interface to x86 Xen. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to 8 * deal in the Software without restriction, including without limitation the 9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or 10 * sell copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 22 * DEALINGS IN THE SOFTWARE. 23 * 24 * Copyright (c) 2004-2006, K A Fraser 25 */ 26 27#ifndef __XEN_PUBLIC_ARCH_X86_XEN_H__ 28#define __XEN_PUBLIC_ARCH_X86_XEN_H__ 29 30#if defined(__i386__) 31#include <xen/interface/arch-x86/xen-x86_32.h> 32#elif defined(__x86_64__) 33#include "xen-x86_64.h" 34#endif 35 36#ifndef __ASSEMBLY__ 37/* Guest handles for primitive C types. */ 38__DEFINE_XEN_GUEST_HANDLE(uchar, unsigned char); 39__DEFINE_XEN_GUEST_HANDLE(uint, unsigned int); 40__DEFINE_XEN_GUEST_HANDLE(ulong, unsigned long); 41#if 0 42DEFINE_XEN_GUEST_HANDLE(char); 43DEFINE_XEN_GUEST_HANDLE(int); 44DEFINE_XEN_GUEST_HANDLE(long); 45DEFINE_XEN_GUEST_HANDLE(void); 46#endif 47typedef unsigned long xen_pfn_t; 48DEFINE_XEN_GUEST_HANDLE(xen_pfn_t); 49#define PRI_xen_pfn "lx" 50#endif 51 52/* 53 * SEGMENT DESCRIPTOR TABLES 54 */ 55/* 56 * A number of GDT entries are reserved by Xen. These are not situated at the 57 * start of the GDT because some stupid OSes export hard-coded selector values 58 * in their ABI. These hard-coded values are always near the start of the GDT, 59 * so Xen places itself out of the way, at the far end of the GDT. 60 */ 61#define FIRST_RESERVED_GDT_PAGE 14 62#define FIRST_RESERVED_GDT_BYTE (FIRST_RESERVED_GDT_PAGE * 4096) 63#define FIRST_RESERVED_GDT_ENTRY (FIRST_RESERVED_GDT_BYTE / 8) 64 65/* Maximum number of virtual CPUs in multi-processor guests. */ 66#define MAX_VIRT_CPUS 32 67 68#ifndef __ASSEMBLY__ 69 70typedef unsigned long xen_ulong_t; 71 72/* 73 * Send an array of these to HYPERVISOR_set_trap_table(). 74 * The privilege level specifies which modes may enter a trap via a software 75 * interrupt. On x86/64, since rings 1 and 2 are unavailable, we allocate 76 * privilege levels as follows: 77 * Level == 0: Noone may enter 78 * Level == 1: Kernel may enter 79 * Level == 2: Kernel may enter 80 * Level == 3: Everyone may enter 81 */ 82#define TI_GET_DPL(_ti) ((_ti)->flags & 3) 83#define TI_GET_IF(_ti) ((_ti)->flags & 4) 84#define TI_SET_DPL(_ti,_dpl) ((_ti)->flags |= (_dpl)) 85#define TI_SET_IF(_ti,_if) ((_ti)->flags |= ((!!(_if))<<2)) 86struct trap_info { 87 uint8_t vector; /* exception vector */ 88 uint8_t flags; /* 0-3: privilege level; 4: clear event enable? */ 89 uint16_t cs; /* code selector */ 90 unsigned long address; /* code offset */ 91}; 92typedef struct trap_info trap_info_t; 93DEFINE_XEN_GUEST_HANDLE(trap_info_t); 94 95typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */ 96 97/* 98 * The following is all CPU context. Note that the fpu_ctxt block is filled 99 * in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used. 100 */ 101struct vcpu_guest_context { 102 /* FPU registers come first so they can be aligned for FXSAVE/FXRSTOR. */ 103 struct { char x[512]; } fpu_ctxt; /* User-level FPU registers */ 104#define VGCF_I387_VALID (1<<0) 105#define VGCF_IN_KERNEL (1<<2) 106#define _VGCF_i387_valid 0 107#define VGCF_i387_valid (1<<_VGCF_i387_valid) 108#define _VGCF_in_kernel 2 109#define VGCF_in_kernel (1<<_VGCF_in_kernel) 110#define _VGCF_failsafe_disables_events 3 111#define VGCF_failsafe_disables_events (1<<_VGCF_failsafe_disables_events) 112#define _VGCF_syscall_disables_events 4 113#define VGCF_syscall_disables_events (1<<_VGCF_syscall_disables_events) 114#define _VGCF_online 5 115#define VGCF_online (1<<_VGCF_online) 116 unsigned long flags; /* VGCF_* flags */ 117 struct cpu_user_regs user_regs; /* User-level CPU registers */ 118 struct trap_info trap_ctxt[256]; /* Virtual IDT */ 119 unsigned long ldt_base, ldt_ents; /* LDT (linear address, # ents) */ 120 unsigned long gdt_frames[16], gdt_ents; /* GDT (machine frames, # ents) */ 121 unsigned long kernel_ss, kernel_sp; /* Virtual TSS (only SS1/SP1) */ 122 /* NB. User pagetable on x86/64 is placed in ctrlreg[1]. */ 123 unsigned long ctrlreg[8]; /* CR0-CR7 (control registers) */ 124 unsigned long debugreg[8]; /* DB0-DB7 (debug registers) */ 125#ifdef __i386__ 126 unsigned long event_callback_cs; /* CS:EIP of event callback */ 127 unsigned long event_callback_eip; 128 unsigned long failsafe_callback_cs; /* CS:EIP of failsafe callback */ 129 unsigned long failsafe_callback_eip; 130#else 131 unsigned long event_callback_eip; 132 unsigned long failsafe_callback_eip; 133#ifdef __XEN__ 134 union { 135 unsigned long syscall_callback_eip; 136 struct { 137 unsigned int event_callback_cs; /* compat CS of event cb */ 138 unsigned int failsafe_callback_cs; /* compat CS of failsafe cb */ 139 }; 140 } u; 141#else 142 unsigned long syscall_callback_eip; 143#endif 144#endif 145 unsigned long vm_assist; /* VMASST_TYPE_* bitmap */ 146#ifdef __x86_64__ 147 /* Segment base addresses. */ 148 uint64_t fs_base; 149 uint64_t gs_base_kernel; 150 uint64_t gs_base_user; 151#endif 152}; 153typedef struct vcpu_guest_context vcpu_guest_context_t; 154DEFINE_XEN_GUEST_HANDLE(vcpu_guest_context_t); 155 156struct arch_shared_info { 157 unsigned long max_pfn; /* max pfn that appears in table */ 158 /* Frame containing list of mfns containing list of mfns containing p2m. */ 159 xen_pfn_t pfn_to_mfn_frame_list_list; 160 unsigned long nmi_reason; 161 uint64_t pad[32]; 162}; 163typedef struct arch_shared_info arch_shared_info_t; 164 165#endif /* !__ASSEMBLY__ */ 166 167/* 168 * Prefix forces emulation of some non-trapping instructions. 169 * Currently only CPUID. 170 */ 171#ifdef __ASSEMBLY__ 172#define XEN_EMULATE_PREFIX .byte 0x0f,0x0b,0x78,0x65,0x6e ; 173#define XEN_CPUID XEN_EMULATE_PREFIX cpuid 174#else 175#define XEN_EMULATE_PREFIX ".byte 0x0f,0x0b,0x78,0x65,0x6e ; " 176#define XEN_CPUID XEN_EMULATE_PREFIX "cpuid" 177#endif 178 179#endif /* __XEN_PUBLIC_ARCH_X86_XEN_H__ */ 180 181/* 182 * Local variables: 183 * mode: C 184 * c-set-style: "BSD" 185 * c-basic-offset: 4 186 * tab-width: 4 187 * indent-tabs-mode: nil 188 * End: 189 */ 190