| 1 | /* SPDX-License-Identifier: MIT */ |
| 2 | /****************************************************************************** |
| 3 | * xen-x86_32.h |
| 4 | * |
| 5 | * Guest OS interface to x86 32-bit Xen. |
| 6 | * |
| 7 | * Copyright (c) 2004-2007, K A Fraser |
| 8 | */ |
| 9 | |
| 10 | #ifndef __XEN_PUBLIC_ARCH_X86_XEN_X86_32_H__ |
| 11 | #define __XEN_PUBLIC_ARCH_X86_XEN_X86_32_H__ |
| 12 | |
| 13 | /* |
| 14 | * Hypercall interface: |
| 15 | * Input: %ebx, %ecx, %edx, %esi, %edi, %ebp (arguments 1-6) |
| 16 | * Output: %eax |
| 17 | * Access is via hypercall page (set up by guest loader or via a Xen MSR): |
| 18 | * call hypercall_page + hypercall-number * 32 |
| 19 | * Clobbered: Argument registers (e.g., 2-arg hypercall clobbers %ebx,%ecx) |
| 20 | */ |
| 21 | |
| 22 | /* |
| 23 | * These flat segments are in the Xen-private section of every GDT. Since these |
| 24 | * are also present in the initial GDT, many OSes will be able to avoid |
| 25 | * installing their own GDT. |
| 26 | */ |
| 27 | #define FLAT_RING1_CS 0xe019 /* GDT index 259 */ |
| 28 | #define FLAT_RING1_DS 0xe021 /* GDT index 260 */ |
| 29 | #define FLAT_RING1_SS 0xe021 /* GDT index 260 */ |
| 30 | #define FLAT_RING3_CS 0xe02b /* GDT index 261 */ |
| 31 | #define FLAT_RING3_DS 0xe033 /* GDT index 262 */ |
| 32 | #define FLAT_RING3_SS 0xe033 /* GDT index 262 */ |
| 33 | |
| 34 | #define FLAT_KERNEL_CS FLAT_RING1_CS |
| 35 | #define FLAT_KERNEL_DS FLAT_RING1_DS |
| 36 | #define FLAT_KERNEL_SS FLAT_RING1_SS |
| 37 | #define FLAT_USER_CS FLAT_RING3_CS |
| 38 | #define FLAT_USER_DS FLAT_RING3_DS |
| 39 | #define FLAT_USER_SS FLAT_RING3_SS |
| 40 | |
| 41 | #define __HYPERVISOR_VIRT_START_PAE 0xF5800000 |
| 42 | #define __MACH2PHYS_VIRT_START_PAE 0xF5800000 |
| 43 | #define __MACH2PHYS_VIRT_END_PAE 0xF6800000 |
| 44 | #define HYPERVISOR_VIRT_START_PAE xen_mk_ulong(__HYPERVISOR_VIRT_START_PAE) |
| 45 | #define MACH2PHYS_VIRT_START_PAE xen_mk_ulong(__MACH2PHYS_VIRT_START_PAE) |
| 46 | #define MACH2PHYS_VIRT_END_PAE xen_mk_ulong(__MACH2PHYS_VIRT_END_PAE) |
| 47 | |
| 48 | /* Non-PAE bounds are obsolete. */ |
| 49 | #define __HYPERVISOR_VIRT_START_NONPAE 0xFC000000 |
| 50 | #define __MACH2PHYS_VIRT_START_NONPAE 0xFC000000 |
| 51 | #define __MACH2PHYS_VIRT_END_NONPAE 0xFC400000 |
| 52 | #define HYPERVISOR_VIRT_START_NONPAE \ |
| 53 | xen_mk_ulong(__HYPERVISOR_VIRT_START_NONPAE) |
| 54 | #define MACH2PHYS_VIRT_START_NONPAE \ |
| 55 | xen_mk_ulong(__MACH2PHYS_VIRT_START_NONPAE) |
| 56 | #define MACH2PHYS_VIRT_END_NONPAE \ |
| 57 | xen_mk_ulong(__MACH2PHYS_VIRT_END_NONPAE) |
| 58 | |
| 59 | #define __HYPERVISOR_VIRT_START __HYPERVISOR_VIRT_START_PAE |
| 60 | #define __MACH2PHYS_VIRT_START __MACH2PHYS_VIRT_START_PAE |
| 61 | #define __MACH2PHYS_VIRT_END __MACH2PHYS_VIRT_END_PAE |
| 62 | |
| 63 | #ifndef HYPERVISOR_VIRT_START |
| 64 | #define HYPERVISOR_VIRT_START xen_mk_ulong(__HYPERVISOR_VIRT_START) |
| 65 | #endif |
| 66 | |
| 67 | #define MACH2PHYS_VIRT_START xen_mk_ulong(__MACH2PHYS_VIRT_START) |
| 68 | #define MACH2PHYS_VIRT_END xen_mk_ulong(__MACH2PHYS_VIRT_END) |
| 69 | #define MACH2PHYS_NR_ENTRIES ((MACH2PHYS_VIRT_END-MACH2PHYS_VIRT_START)>>2) |
| 70 | #ifndef machine_to_phys_mapping |
| 71 | #define machine_to_phys_mapping ((unsigned long *)MACH2PHYS_VIRT_START) |
| 72 | #endif |
| 73 | |
| 74 | /* 32-/64-bit invariability for control interfaces (domctl/sysctl). */ |
| 75 | #if defined(__XEN__) || defined(__XEN_TOOLS__) |
| 76 | #undef ___DEFINE_XEN_GUEST_HANDLE |
| 77 | #define ___DEFINE_XEN_GUEST_HANDLE(name, type) \ |
| 78 | typedef struct { type *p; } \ |
| 79 | __guest_handle_ ## name; \ |
| 80 | typedef struct { union { type *p; uint64_aligned_t q; }; } \ |
| 81 | __guest_handle_64_ ## name |
| 82 | #undef set_xen_guest_handle_raw |
| 83 | #define set_xen_guest_handle_raw(hnd, val) \ |
| 84 | do { if ( sizeof(hnd) == 8 ) *(uint64_t *)&(hnd) = 0; \ |
| 85 | (hnd).p = val; \ |
| 86 | } while ( 0 ) |
| 87 | #define int64_aligned_t int64_t __attribute__((aligned(8))) |
| 88 | #define uint64_aligned_t uint64_t __attribute__((aligned(8))) |
| 89 | #define __XEN_GUEST_HANDLE_64(name) __guest_handle_64_ ## name |
| 90 | #define XEN_GUEST_HANDLE_64(name) __XEN_GUEST_HANDLE_64(name) |
| 91 | #endif |
| 92 | |
| 93 | #ifndef __ASSEMBLY__ |
| 94 | |
| 95 | #if defined(XEN_GENERATING_COMPAT_HEADERS) |
| 96 | /* nothing */ |
| 97 | #elif defined(__XEN__) || defined(__XEN_TOOLS__) |
| 98 | /* Anonymous unions include all permissible names (e.g., al/ah/ax/eax). */ |
| 99 | #define __DECL_REG_LO8(which) union { \ |
| 100 | uint32_t e ## which ## x; \ |
| 101 | uint16_t which ## x; \ |
| 102 | struct { \ |
| 103 | uint8_t which ## l; \ |
| 104 | uint8_t which ## h; \ |
| 105 | }; \ |
| 106 | } |
| 107 | #define __DECL_REG_LO16(name) union { \ |
| 108 | uint32_t e ## name, _e ## name; \ |
| 109 | uint16_t name; \ |
| 110 | } |
| 111 | #else |
| 112 | /* Other sources must always use the proper 32-bit name (e.g., eax). */ |
| 113 | #define __DECL_REG_LO8(which) uint32_t e ## which ## x |
| 114 | #define __DECL_REG_LO16(name) uint32_t e ## name |
| 115 | #endif |
| 116 | |
| 117 | struct cpu_user_regs { |
| 118 | __DECL_REG_LO8(b); |
| 119 | __DECL_REG_LO8(c); |
| 120 | __DECL_REG_LO8(d); |
| 121 | __DECL_REG_LO16(si); |
| 122 | __DECL_REG_LO16(di); |
| 123 | __DECL_REG_LO16(bp); |
| 124 | __DECL_REG_LO8(a); |
| 125 | uint16_t error_code; /* private */ |
| 126 | uint16_t entry_vector; /* private */ |
| 127 | __DECL_REG_LO16(ip); |
| 128 | uint16_t cs; |
| 129 | uint8_t saved_upcall_mask; |
| 130 | uint8_t _pad0; |
| 131 | __DECL_REG_LO16(flags); /* eflags.IF == !saved_upcall_mask */ |
| 132 | __DECL_REG_LO16(sp); |
| 133 | uint16_t ss, _pad1; |
| 134 | uint16_t es, _pad2; |
| 135 | uint16_t ds, _pad3; |
| 136 | uint16_t fs, _pad4; |
| 137 | uint16_t gs, _pad5; |
| 138 | }; |
| 139 | typedef struct cpu_user_regs cpu_user_regs_t; |
| 140 | DEFINE_XEN_GUEST_HANDLE(cpu_user_regs_t); |
| 141 | |
| 142 | #undef __DECL_REG_LO8 |
| 143 | #undef __DECL_REG_LO16 |
| 144 | |
| 145 | /* |
| 146 | * Page-directory addresses above 4GB do not fit into architectural %cr3. |
| 147 | * When accessing %cr3, or equivalent field in vcpu_guest_context, guests |
| 148 | * must use the following accessor macros to pack/unpack valid MFNs. |
| 149 | */ |
| 150 | #define xen_pfn_to_cr3(pfn) (((unsigned)(pfn) << 12) | ((unsigned)(pfn) >> 20)) |
| 151 | #define xen_cr3_to_pfn(cr3) (((unsigned)(cr3) >> 12) | ((unsigned)(cr3) << 20)) |
| 152 | |
| 153 | struct arch_vcpu_info { |
| 154 | unsigned long cr2; |
| 155 | unsigned long pad[5]; /* sizeof(vcpu_info_t) == 64 */ |
| 156 | }; |
| 157 | typedef struct arch_vcpu_info arch_vcpu_info_t; |
| 158 | |
| 159 | struct xen_callback { |
| 160 | unsigned long cs; |
| 161 | unsigned long eip; |
| 162 | }; |
| 163 | typedef struct xen_callback xen_callback_t; |
| 164 | |
| 165 | #endif /* !__ASSEMBLY__ */ |
| 166 | |
| 167 | #endif /* __XEN_PUBLIC_ARCH_X86_XEN_X86_32_H__ */ |
| 168 | |
| 169 | /* |
| 170 | * Local variables: |
| 171 | * mode: C |
| 172 | * c-file-style: "BSD" |
| 173 | * c-basic-offset: 4 |
| 174 | * tab-width: 4 |
| 175 | * indent-tabs-mode: nil |
| 176 | * End: |
| 177 | */ |