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 DEFINE_GUEST_HANDLE(uint64_t); 59 DEFINE_GUEST_HANDLE(uint32_t); 60 #endif 61 62 #ifndef HYPERVISOR_VIRT_START 63 #define HYPERVISOR_VIRT_START mk_unsigned_long(__HYPERVISOR_VIRT_START) 64 #endif 65 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) 69 70 /* Maximum number of virtual CPUs in multi-processor guests. */ 71 #define MAX_VIRT_CPUS 32 72 73 /* 74 * SEGMENT DESCRIPTOR TABLES 75 */ 76 /* 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. 81 */ 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) 85 86 /* 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 95 */ 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)) 100 101 #ifndef __ASSEMBLY__ 102 struct trap_info { 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 */ 107 }; 108 DEFINE_GUEST_HANDLE_STRUCT(trap_info); 109 110 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; 115 }; 116 #endif /* !__ASSEMBLY__ */ 117 118 #ifdef CONFIG_X86_32 119 #include "interface_32.h" 120 #else 121 #include "interface_64.h" 122 #endif 123 124 #ifndef __ASSEMBLY__ 125 /* 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. 128 */ 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) */ 144 #ifdef __i386__ 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; 149 #else 150 unsigned long event_callback_eip; 151 unsigned long failsafe_callback_eip; 152 unsigned long syscall_callback_eip; 153 #endif 154 unsigned long vm_assist; /* VMASST_TYPE_* bitmap */ 155 #ifdef __x86_64__ 156 /* Segment base addresses. */ 157 uint64_t fs_base; 158 uint64_t gs_base_kernel; 159 uint64_t gs_base_user; 160 #endif 161 }; 162 DEFINE_GUEST_HANDLE_STRUCT(vcpu_guest_context); 163 #endif /* !__ASSEMBLY__ */ 164 165 /* 166 * Prefix forces emulation of some non-trapping instructions. 167 * Currently only CPUID. 168 */ 169 #ifdef __ASSEMBLY__ 170 #define XEN_EMULATE_PREFIX .byte 0x0f,0x0b,0x78,0x65,0x6e ; 171 #define XEN_CPUID XEN_EMULATE_PREFIX cpuid 172 #else 173 #define XEN_EMULATE_PREFIX ".byte 0x0f,0x0b,0x78,0x65,0x6e ; " 174 #define XEN_CPUID XEN_EMULATE_PREFIX "cpuid" 175 #endif 176 177 #endif /* _ASM_X86_XEN_INTERFACE_H */ 178