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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
49struct 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};
71DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs);
72
73typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */
74
75struct arch_vcpu_info {
76 unsigned long cr2;
77 unsigned long pad[5]; /* sizeof(struct vcpu_info) == 64 */
78};
79
80struct xen_callback {
81 unsigned long cs;
82 unsigned long eip;
83};
84typedef 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

Warning: That file was not part of the compilation database. It may have many parsing errors.