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1.1 root 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 (arguments 1-5)
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: #if __XEN_INTERFACE_VERSION__ < 0x00030203
40: /*
41: * Legacy hypercall interface:
42: * As above, except the entry sequence to the hypervisor is:
43: * mov $hypercall-number*32,%eax ; int $0x82
44: */
45: #define TRAP_INSTR "int $0x82"
46: #endif
47:
48: /*
49: * These flat segments are in the Xen-private section of every GDT. Since these
50: * are also present in the initial GDT, many OSes will be able to avoid
51: * installing their own GDT.
52: */
53: #define FLAT_RING1_CS 0xe019 /* GDT index 259 */
54: #define FLAT_RING1_DS 0xe021 /* GDT index 260 */
55: #define FLAT_RING1_SS 0xe021 /* GDT index 260 */
56: #define FLAT_RING3_CS 0xe02b /* GDT index 261 */
57: #define FLAT_RING3_DS 0xe033 /* GDT index 262 */
58: #define FLAT_RING3_SS 0xe033 /* GDT index 262 */
59:
60: #define FLAT_KERNEL_CS FLAT_RING1_CS
61: #define FLAT_KERNEL_DS FLAT_RING1_DS
62: #define FLAT_KERNEL_SS FLAT_RING1_SS
63: #define FLAT_USER_CS FLAT_RING3_CS
64: #define FLAT_USER_DS FLAT_RING3_DS
65: #define FLAT_USER_SS FLAT_RING3_SS
66:
67: #define __HYPERVISOR_VIRT_START_PAE 0xF5800000
68: #define __MACH2PHYS_VIRT_START_PAE 0xF5800000
69: #define __MACH2PHYS_VIRT_END_PAE 0xF6800000
70: #define HYPERVISOR_VIRT_START_PAE \
71: mk_unsigned_long(__HYPERVISOR_VIRT_START_PAE)
72: #define MACH2PHYS_VIRT_START_PAE \
73: mk_unsigned_long(__MACH2PHYS_VIRT_START_PAE)
74: #define MACH2PHYS_VIRT_END_PAE \
75: mk_unsigned_long(__MACH2PHYS_VIRT_END_PAE)
76:
77: /* Non-PAE bounds are obsolete. */
78: #define __HYPERVISOR_VIRT_START_NONPAE 0xFC000000
79: #define __MACH2PHYS_VIRT_START_NONPAE 0xFC000000
80: #define __MACH2PHYS_VIRT_END_NONPAE 0xFC400000
81: #define HYPERVISOR_VIRT_START_NONPAE \
82: mk_unsigned_long(__HYPERVISOR_VIRT_START_NONPAE)
83: #define MACH2PHYS_VIRT_START_NONPAE \
84: mk_unsigned_long(__MACH2PHYS_VIRT_START_NONPAE)
85: #define MACH2PHYS_VIRT_END_NONPAE \
86: mk_unsigned_long(__MACH2PHYS_VIRT_END_NONPAE)
87:
88: #define __HYPERVISOR_VIRT_START __HYPERVISOR_VIRT_START_PAE
89: #define __MACH2PHYS_VIRT_START __MACH2PHYS_VIRT_START_PAE
90: #define __MACH2PHYS_VIRT_END __MACH2PHYS_VIRT_END_PAE
91:
92: #ifndef HYPERVISOR_VIRT_START
93: #define HYPERVISOR_VIRT_START mk_unsigned_long(__HYPERVISOR_VIRT_START)
94: #endif
95:
96: #define MACH2PHYS_VIRT_START mk_unsigned_long(__MACH2PHYS_VIRT_START)
97: #define MACH2PHYS_VIRT_END mk_unsigned_long(__MACH2PHYS_VIRT_END)
98: #define MACH2PHYS_NR_ENTRIES ((MACH2PHYS_VIRT_END-MACH2PHYS_VIRT_START)>>2)
99: #ifndef machine_to_phys_mapping
100: #define machine_to_phys_mapping ((unsigned long *)MACH2PHYS_VIRT_START)
101: #endif
102:
103: /* 32-/64-bit invariability for control interfaces (domctl/sysctl). */
104: #if defined(__XEN__) || defined(__XEN_TOOLS__)
105: #undef ___DEFINE_XEN_GUEST_HANDLE
106: #define ___DEFINE_XEN_GUEST_HANDLE(name, type) \
107: typedef struct { type *p; } \
108: __guest_handle_ ## name; \
109: typedef struct { union { type *p; uint64_aligned_t q; }; } \
110: __guest_handle_64_ ## name
111: #undef set_xen_guest_handle
112: #define set_xen_guest_handle(hnd, val) \
113: do { if ( sizeof(hnd) == 8 ) *(uint64_t *)&(hnd) = 0; \
114: (hnd).p = val; \
115: } while ( 0 )
116: #define uint64_aligned_t uint64_t __attribute__((aligned(8)))
117: #define __XEN_GUEST_HANDLE_64(name) __guest_handle_64_ ## name
118: #define XEN_GUEST_HANDLE_64(name) __XEN_GUEST_HANDLE_64(name)
119: #endif
120:
121: #ifndef __ASSEMBLY__
122:
123: struct cpu_user_regs {
124: uint32_t ebx;
125: uint32_t ecx;
126: uint32_t edx;
127: uint32_t esi;
128: uint32_t edi;
129: uint32_t ebp;
130: uint32_t eax;
131: uint16_t error_code; /* private */
132: uint16_t entry_vector; /* private */
133: uint32_t eip;
134: uint16_t cs;
135: uint8_t saved_upcall_mask;
136: uint8_t _pad0;
137: uint32_t eflags; /* eflags.IF == !saved_upcall_mask */
138: uint32_t esp;
139: uint16_t ss, _pad1;
140: uint16_t es, _pad2;
141: uint16_t ds, _pad3;
142: uint16_t fs, _pad4;
143: uint16_t gs, _pad5;
144: };
145: typedef struct cpu_user_regs cpu_user_regs_t;
146: DEFINE_XEN_GUEST_HANDLE(cpu_user_regs_t);
147:
148: /*
149: * Page-directory addresses above 4GB do not fit into architectural %cr3.
150: * When accessing %cr3, or equivalent field in vcpu_guest_context, guests
151: * must use the following accessor macros to pack/unpack valid MFNs.
152: */
153: #define xen_pfn_to_cr3(pfn) (((unsigned)(pfn) << 12) | ((unsigned)(pfn) >> 20))
154: #define xen_cr3_to_pfn(cr3) (((unsigned)(cr3) >> 12) | ((unsigned)(cr3) << 20))
155:
156: struct arch_vcpu_info {
157: unsigned long cr2;
158: unsigned long pad[5]; /* sizeof(vcpu_info_t) == 64 */
159: };
160: typedef struct arch_vcpu_info arch_vcpu_info_t;
161:
162: struct xen_callback {
163: unsigned long cs;
164: unsigned long eip;
165: };
166: typedef struct xen_callback xen_callback_t;
167:
168: #endif /* !__ASSEMBLY__ */
169:
170: #endif /* __XEN_PUBLIC_ARCH_X86_XEN_X86_32_H__ */
171:
172: /*
173: * Local variables:
174: * mode: C
175: * c-set-style: "BSD"
176: * c-basic-offset: 4
177: * tab-width: 4
178: * indent-tabs-mode: nil
179: * End:
180: */
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