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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 | |
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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