1 /* SPDX-License-Identifier: GPL-2.0 */
2 /******************************************************************************
3 * arch-x86_32.h
4 *
5 * Guest OS interface to x86 32-bit Xen.
6 *
7 * Copyright (c) 2004, K A Fraser
8 */
9
10 #ifndef _ASM_X86_XEN_INTERFACE_32_H
11 #define _ASM_X86_XEN_INTERFACE_32_H
12
13
14 /*
15 * These flat segments are in the Xen-private section of every GDT. Since these
16 * are also present in the initial GDT, many OSes will be able to avoid
17 * installing their own GDT.
18 */
19 #define FLAT_RING1_CS 0xe019 /* GDT index 259 */
20 #define FLAT_RING1_DS 0xe021 /* GDT index 260 */
21 #define FLAT_RING1_SS 0xe021 /* GDT index 260 */
22 #define FLAT_RING3_CS 0xe02b /* GDT index 261 */
23 #define FLAT_RING3_DS 0xe033 /* GDT index 262 */
24 #define FLAT_RING3_SS 0xe033 /* GDT index 262 */
25
26 #define FLAT_KERNEL_CS FLAT_RING1_CS
27 #define FLAT_KERNEL_DS FLAT_RING1_DS
28 #define FLAT_KERNEL_SS FLAT_RING1_SS
29 #define FLAT_USER_CS FLAT_RING3_CS
30 #define FLAT_USER_DS FLAT_RING3_DS
31 #define FLAT_USER_SS FLAT_RING3_SS
32
33 /* And the trap vector is... */
34 #define TRAP_INSTR "int $0x82"
35
36 #define __MACH2PHYS_VIRT_START 0xF5800000
37 #define __MACH2PHYS_VIRT_END 0xF6800000
38
39 #define __MACH2PHYS_SHIFT 2
40
41 /*
42 * Virtual addresses beyond this are not modifiable by guest OSes. The
43 * machine->physical mapping table starts at this address, read-only.
44 */
45 #define __HYPERVISOR_VIRT_START 0xF5800000
46
47 #ifndef __ASSEMBLY__
48
49 struct cpu_user_regs {
50 uint32_t ebx;
51 uint32_t ecx;
52 uint32_t edx;
53 uint32_t esi;
54 uint32_t edi;
55 uint32_t ebp;
56 uint32_t eax;
57 uint16_t error_code; /* private */
58 uint16_t entry_vector; /* private */
59 uint32_t eip;
60 uint16_t cs;
61 uint8_t saved_upcall_mask;
62 uint8_t _pad0;
63 uint32_t eflags; /* eflags.IF == !saved_upcall_mask */
64 uint32_t esp;
65 uint16_t ss, _pad1;
66 uint16_t es, _pad2;
67 uint16_t ds, _pad3;
68 uint16_t fs, _pad4;
69 uint16_t gs, _pad5;
70 };
71 DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs);
72
73 typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */
74
75 struct arch_vcpu_info {
76 unsigned long cr2;
77 unsigned long pad[5]; /* sizeof(struct vcpu_info) == 64 */
78 };
79
80 struct xen_callback {
81 unsigned long cs;
82 unsigned long eip;
83 };
84 typedef struct xen_callback xen_callback_t;
85
86 #define XEN_CALLBACK(__cs, __eip) \
87 ((struct xen_callback){ .cs = (__cs), .eip = (unsigned long)(__eip) })
88 #endif /* !__ASSEMBLY__ */
89
90
91 /*
92 * Page-directory addresses above 4GB do not fit into architectural %cr3.
93 * When accessing %cr3, or equivalent field in vcpu_guest_context, guests
94 * must use the following accessor macros to pack/unpack valid MFNs.
95 *
96 * Note that Xen is using the fact that the pagetable base is always
97 * page-aligned, and putting the 12 MSB of the address into the 12 LSB
98 * of cr3.
99 */
100 #define xen_pfn_to_cr3(pfn) (((unsigned)(pfn) << 12) | ((unsigned)(pfn) >> 20))
101 #define xen_cr3_to_pfn(cr3) (((unsigned)(cr3) >> 12) | ((unsigned)(cr3) << 20))
102
103 #endif /* _ASM_X86_XEN_INTERFACE_32_H */
104
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