1 /****************************************************************************** 2 * arch-x86_32.h 3 * 4 * Guest OS interface to x86 Xen. 5 * 6 * Copyright (c) 2004, K A Fraser 7 */ 8 9 #ifndef _ASM_X86_XEN_INTERFACE_H 10 #define _ASM_X86_XEN_INTERFACE_H 11 12 #ifdef __XEN__ 13 #define __DEFINE_GUEST_HANDLE(name, type) \ 14 typedef struct { type *p; } __guest_handle_ ## name 15 #else 16 #define __DEFINE_GUEST_HANDLE(name, type) \ 17 typedef type * __guest_handle_ ## name 18 #endif 19 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 24 25 #ifdef __XEN__ 26 #if defined(__i386__) 27 #define set_xen_guest_handle(hnd, val) \ 28 do { \ 29 if (sizeof(hnd) == 8) \ 30 *(uint64_t *)&(hnd) = 0; \ 31 (hnd).p = val; \ 32 } while (0) 33 #elif defined(__x86_64__) 34 #define set_xen_guest_handle(hnd, val) do { (hnd).p = val; } while (0) 35 #endif 36 #else 37 #if defined(__i386__) 38 #define set_xen_guest_handle(hnd, val) \ 39 do { \ 40 if (sizeof(hnd) == 8) \ 41 *(uint64_t *)&(hnd) = 0; \ 42 (hnd) = val; \ 43 } while (0) 44 #elif defined(__x86_64__) 45 #define set_xen_guest_handle(hnd, val) do { (hnd) = val; } while (0) 46 #endif 47 #endif 48 49 #ifndef __ASSEMBLY__ 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 #endif 59 60 #ifndef HYPERVISOR_VIRT_START 61 #define HYPERVISOR_VIRT_START mk_unsigned_long(__HYPERVISOR_VIRT_START) 62 #endif 63 64 #ifndef machine_to_phys_mapping 65 #define machine_to_phys_mapping ((unsigned long *)HYPERVISOR_VIRT_START) 66 #endif 67 68 /* Maximum number of virtual CPUs in multi-processor guests. */ 69 #define MAX_VIRT_CPUS 32 70 71 /* 72 * SEGMENT DESCRIPTOR TABLES 73 */ 74 /* 75 * A number of GDT entries are reserved by Xen. These are not situated at the 76 * start of the GDT because some stupid OSes export hard-coded selector values 77 * in their ABI. These hard-coded values are always near the start of the GDT, 78 * so Xen places itself out of the way, at the far end of the GDT. 79 */ 80 #define FIRST_RESERVED_GDT_PAGE 14 81 #define FIRST_RESERVED_GDT_BYTE (FIRST_RESERVED_GDT_PAGE * 4096) 82 #define FIRST_RESERVED_GDT_ENTRY (FIRST_RESERVED_GDT_BYTE / 8) 83 84 /* 85 * Send an array of these to HYPERVISOR_set_trap_table() 86 * The privilege level specifies which modes may enter a trap via a software 87 * interrupt. On x86/64, since rings 1 and 2 are unavailable, we allocate 88 * privilege levels as follows: 89 * Level == 0: Noone may enter 90 * Level == 1: Kernel may enter 91 * Level == 2: Kernel may enter 92 * Level == 3: Everyone may enter 93 */ 94 #define TI_GET_DPL(_ti) ((_ti)->flags & 3) 95 #define TI_GET_IF(_ti) ((_ti)->flags & 4) 96 #define TI_SET_DPL(_ti, _dpl) ((_ti)->flags |= (_dpl)) 97 #define TI_SET_IF(_ti, _if) ((_ti)->flags |= ((!!(_if))<<2)) 98 99 #ifndef __ASSEMBLY__ 100 struct trap_info { 101 uint8_t vector; /* exception vector */ 102 uint8_t flags; /* 0-3: privilege level; 4: clear event enable? */ 103 uint16_t cs; /* code selector */ 104 unsigned long address; /* code offset */ 105 }; 106 DEFINE_GUEST_HANDLE_STRUCT(trap_info); 107 108 struct arch_shared_info { 109 unsigned long max_pfn; /* max pfn that appears in table */ 110 /* Frame containing list of mfns containing list of mfns containing p2m. */ 111 unsigned long pfn_to_mfn_frame_list_list; 112 unsigned long nmi_reason; 113 }; 114 #endif /* !__ASSEMBLY__ */ 115 116 #ifdef CONFIG_X86_32 117 #include "interface_32.h" 118 #else 119 #include "interface_64.h" 120 #endif 121 122 #ifndef __ASSEMBLY__ 123 /* 124 * The following is all CPU context. Note that the fpu_ctxt block is filled 125 * in by FXSAVE if the CPU has feature FXSR; otherwise FSAVE is used. 126 */ 127 struct vcpu_guest_context { 128 /* FPU registers come first so they can be aligned for FXSAVE/FXRSTOR. */ 129 struct { char x[512]; } fpu_ctxt; /* User-level FPU registers */ 130 #define VGCF_I387_VALID (1<<0) 131 #define VGCF_HVM_GUEST (1<<1) 132 #define VGCF_IN_KERNEL (1<<2) 133 unsigned long flags; /* VGCF_* flags */ 134 struct cpu_user_regs user_regs; /* User-level CPU registers */ 135 struct trap_info trap_ctxt[256]; /* Virtual IDT */ 136 unsigned long ldt_base, ldt_ents; /* LDT (linear address, # ents) */ 137 unsigned long gdt_frames[16], gdt_ents; /* GDT (machine frames, # ents) */ 138 unsigned long kernel_ss, kernel_sp; /* Virtual TSS (only SS1/SP1) */ 139 /* NB. User pagetable on x86/64 is placed in ctrlreg[1]. */ 140 unsigned long ctrlreg[8]; /* CR0-CR7 (control registers) */ 141 unsigned long debugreg[8]; /* DB0-DB7 (debug registers) */ 142 #ifdef __i386__ 143 unsigned long event_callback_cs; /* CS:EIP of event callback */ 144 unsigned long event_callback_eip; 145 unsigned long failsafe_callback_cs; /* CS:EIP of failsafe callback */ 146 unsigned long failsafe_callback_eip; 147 #else 148 unsigned long event_callback_eip; 149 unsigned long failsafe_callback_eip; 150 unsigned long syscall_callback_eip; 151 #endif 152 unsigned long vm_assist; /* VMASST_TYPE_* bitmap */ 153 #ifdef __x86_64__ 154 /* Segment base addresses. */ 155 uint64_t fs_base; 156 uint64_t gs_base_kernel; 157 uint64_t gs_base_user; 158 #endif 159 }; 160 DEFINE_GUEST_HANDLE_STRUCT(vcpu_guest_context); 161 #endif /* !__ASSEMBLY__ */ 162 163 /* 164 * Prefix forces emulation of some non-trapping instructions. 165 * Currently only CPUID. 166 */ 167 #ifdef __ASSEMBLY__ 168 #define XEN_EMULATE_PREFIX .byte 0x0f,0x0b,0x78,0x65,0x6e ; 169 #define XEN_CPUID XEN_EMULATE_PREFIX cpuid 170 #else 171 #define XEN_EMULATE_PREFIX ".byte 0x0f,0x0b,0x78,0x65,0x6e ; " 172 #define XEN_CPUID XEN_EMULATE_PREFIX "cpuid" 173 #endif 174 175 #endif /* _ASM_X86_XEN_INTERFACE_H */ 176