1 /****************************************************************************** 2 * xen-x86_32.h 3 * 4 * Guest OS interface to x86 32-bit 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) 2004-2007, K A Fraser 25 */ 26 27 #ifndef __XEN_PUBLIC_ARCH_X86_XEN_X86_32_H__ 28 #define __XEN_PUBLIC_ARCH_X86_XEN_X86_32_H__ 29 30 /* 31 * Hypercall interface: 32 * Input: %ebx, %ecx, %edx, %esi, %edi, %ebp (arguments 1-6) 33 * Output: %eax 34 * Access is via hypercall page (set up by guest loader or via a Xen MSR): 35 * call hypercall_page + hypercall-number * 32 36 * Clobbered: Argument registers (e.g., 2-arg hypercall clobbers %ebx,%ecx) 37 */ 38 39 /* 40 * These flat segments are in the Xen-private section of every GDT. Since these 41 * are also present in the initial GDT, many OSes will be able to avoid 42 * installing their own GDT. 43 */ 44 #define FLAT_RING1_CS 0xe019 /* GDT index 259 */ 45 #define FLAT_RING1_DS 0xe021 /* GDT index 260 */ 46 #define FLAT_RING1_SS 0xe021 /* GDT index 260 */ 47 #define FLAT_RING3_CS 0xe02b /* GDT index 261 */ 48 #define FLAT_RING3_DS 0xe033 /* GDT index 262 */ 49 #define FLAT_RING3_SS 0xe033 /* GDT index 262 */ 50 51 #define FLAT_KERNEL_CS FLAT_RING1_CS 52 #define FLAT_KERNEL_DS FLAT_RING1_DS 53 #define FLAT_KERNEL_SS FLAT_RING1_SS 54 #define FLAT_USER_CS FLAT_RING3_CS 55 #define FLAT_USER_DS FLAT_RING3_DS 56 #define FLAT_USER_SS FLAT_RING3_SS 57 58 #define __HYPERVISOR_VIRT_START_PAE 0xF5800000 59 #define __MACH2PHYS_VIRT_START_PAE 0xF5800000 60 #define __MACH2PHYS_VIRT_END_PAE 0xF6800000 61 #define HYPERVISOR_VIRT_START_PAE xen_mk_ulong(__HYPERVISOR_VIRT_START_PAE) 62 #define MACH2PHYS_VIRT_START_PAE xen_mk_ulong(__MACH2PHYS_VIRT_START_PAE) 63 #define MACH2PHYS_VIRT_END_PAE xen_mk_ulong(__MACH2PHYS_VIRT_END_PAE) 64 65 /* Non-PAE bounds are obsolete. */ 66 #define __HYPERVISOR_VIRT_START_NONPAE 0xFC000000 67 #define __MACH2PHYS_VIRT_START_NONPAE 0xFC000000 68 #define __MACH2PHYS_VIRT_END_NONPAE 0xFC400000 69 #define HYPERVISOR_VIRT_START_NONPAE \ 70 xen_mk_ulong(__HYPERVISOR_VIRT_START_NONPAE) 71 #define MACH2PHYS_VIRT_START_NONPAE \ 72 xen_mk_ulong(__MACH2PHYS_VIRT_START_NONPAE) 73 #define MACH2PHYS_VIRT_END_NONPAE \ 74 xen_mk_ulong(__MACH2PHYS_VIRT_END_NONPAE) 75 76 #define __HYPERVISOR_VIRT_START __HYPERVISOR_VIRT_START_PAE 77 #define __MACH2PHYS_VIRT_START __MACH2PHYS_VIRT_START_PAE 78 #define __MACH2PHYS_VIRT_END __MACH2PHYS_VIRT_END_PAE 79 80 #ifndef HYPERVISOR_VIRT_START 81 #define HYPERVISOR_VIRT_START xen_mk_ulong(__HYPERVISOR_VIRT_START) 82 #endif 83 84 #define MACH2PHYS_VIRT_START xen_mk_ulong(__MACH2PHYS_VIRT_START) 85 #define MACH2PHYS_VIRT_END xen_mk_ulong(__MACH2PHYS_VIRT_END) 86 #define MACH2PHYS_NR_ENTRIES ((MACH2PHYS_VIRT_END-MACH2PHYS_VIRT_START)>>2) 87 #ifndef machine_to_phys_mapping 88 #define machine_to_phys_mapping ((unsigned long *)MACH2PHYS_VIRT_START) 89 #endif 90 91 /* 32-/64-bit invariability for control interfaces (domctl/sysctl). */ 92 #if defined(__XEN__) || defined(__XEN_TOOLS__) 93 #undef ___DEFINE_XEN_GUEST_HANDLE 94 #define ___DEFINE_XEN_GUEST_HANDLE(name, type) \ 95 typedef struct { type *p; } \ 96 __guest_handle_ ## name; \ 97 typedef struct { union { type *p; uint64_aligned_t q; }; } \ 98 __guest_handle_64_ ## name 99 #undef set_xen_guest_handle_raw 100 #define set_xen_guest_handle_raw(hnd, val) \ 101 do { if ( sizeof(hnd) == 8 ) *(uint64_t *)&(hnd) = 0; \ 102 (hnd).p = val; \ 103 } while ( 0 ) 104 #define int64_aligned_t int64_t __attribute__((aligned(8))) 105 #define uint64_aligned_t uint64_t __attribute__((aligned(8))) 106 #define __XEN_GUEST_HANDLE_64(name) __guest_handle_64_ ## name 107 #define XEN_GUEST_HANDLE_64(name) __XEN_GUEST_HANDLE_64(name) 108 #endif 109 110 #ifndef __ASSEMBLY__ 111 112 #if defined(XEN_GENERATING_COMPAT_HEADERS) 113 /* nothing */ 114 #elif defined(__XEN__) || defined(__XEN_TOOLS__) 115 /* Anonymous unions include all permissible names (e.g., al/ah/ax/eax). */ 116 #define __DECL_REG_LO8(which) union { \ 117 uint32_t e ## which ## x; \ 118 uint16_t which ## x; \ 119 struct { \ 120 uint8_t which ## l; \ 121 uint8_t which ## h; \ 122 }; \ 123 } 124 #define __DECL_REG_LO16(name) union { \ 125 uint32_t e ## name, _e ## name; \ 126 uint16_t name; \ 127 } 128 #else 129 /* Other sources must always use the proper 32-bit name (e.g., eax). */ 130 #define __DECL_REG_LO8(which) uint32_t e ## which ## x 131 #define __DECL_REG_LO16(name) uint32_t e ## name 132 #endif 133 134 struct cpu_user_regs { 135 __DECL_REG_LO8(b); 136 __DECL_REG_LO8(c); 137 __DECL_REG_LO8(d); 138 __DECL_REG_LO16(si); 139 __DECL_REG_LO16(di); 140 __DECL_REG_LO16(bp); 141 __DECL_REG_LO8(a); 142 uint16_t error_code; /* private */ 143 uint16_t entry_vector; /* private */ 144 __DECL_REG_LO16(ip); 145 uint16_t cs; 146 uint8_t saved_upcall_mask; 147 uint8_t _pad0; 148 __DECL_REG_LO16(flags); /* eflags.IF == !saved_upcall_mask */ 149 __DECL_REG_LO16(sp); 150 uint16_t ss, _pad1; 151 uint16_t es, _pad2; 152 uint16_t ds, _pad3; 153 uint16_t fs, _pad4; 154 uint16_t gs, _pad5; 155 }; 156 typedef struct cpu_user_regs cpu_user_regs_t; 157 DEFINE_XEN_GUEST_HANDLE(cpu_user_regs_t); 158 159 #undef __DECL_REG_LO8 160 #undef __DECL_REG_LO16 161 162 /* 163 * Page-directory addresses above 4GB do not fit into architectural %cr3. 164 * When accessing %cr3, or equivalent field in vcpu_guest_context, guests 165 * must use the following accessor macros to pack/unpack valid MFNs. 166 */ 167 #define xen_pfn_to_cr3(pfn) (((unsigned)(pfn) << 12) | ((unsigned)(pfn) >> 20)) 168 #define xen_cr3_to_pfn(cr3) (((unsigned)(cr3) >> 12) | ((unsigned)(cr3) << 20)) 169 170 struct arch_vcpu_info { 171 unsigned long cr2; 172 unsigned long pad[5]; /* sizeof(vcpu_info_t) == 64 */ 173 }; 174 typedef struct arch_vcpu_info arch_vcpu_info_t; 175 176 struct xen_callback { 177 unsigned long cs; 178 unsigned long eip; 179 }; 180 typedef struct xen_callback xen_callback_t; 181 182 #endif /* !__ASSEMBLY__ */ 183 184 #endif /* __XEN_PUBLIC_ARCH_X86_XEN_X86_32_H__ */ 185 186 /* 187 * Local variables: 188 * mode: C 189 * c-file-style: "BSD" 190 * c-basic-offset: 4 191 * tab-width: 4 192 * indent-tabs-mode: nil 193 * End: 194 */ 195