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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
48b5db20 JF |
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 | ||
05e4d316 PA |
10 | #ifndef _ASM_X86_XEN_INTERFACE_32_H |
11 | #define _ASM_X86_XEN_INTERFACE_32_H | |
48b5db20 JF |
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 | ||
7e77506a IC |
36 | #define __MACH2PHYS_VIRT_START 0xF5800000 |
37 | #define __MACH2PHYS_VIRT_END 0xF6800000 | |
38 | ||
39 | #define __MACH2PHYS_SHIFT 2 | |
40 | ||
48b5db20 JF |
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 | ||
05e4d316 | 103 | #endif /* _ASM_X86_XEN_INTERFACE_32_H */ |