Commit | Line | Data |
---|---|---|
48b5db20 JF |
1 | /****************************************************************************** |
2 | * arch-x86_32.h | |
3 | * | |
4 | * Guest OS interface to x86 32-bit Xen. | |
5 | * | |
6 | * Copyright (c) 2004, K A Fraser | |
7 | */ | |
8 | ||
1965aae3 PA |
9 | #ifndef _ASM_X86_XEN__INTERFACE_32_H |
10 | #define _ASM_X86_XEN__INTERFACE_32_H | |
48b5db20 JF |
11 | |
12 | ||
13 | /* | |
14 | * These flat segments are in the Xen-private section of every GDT. Since these | |
15 | * are also present in the initial GDT, many OSes will be able to avoid | |
16 | * installing their own GDT. | |
17 | */ | |
18 | #define FLAT_RING1_CS 0xe019 /* GDT index 259 */ | |
19 | #define FLAT_RING1_DS 0xe021 /* GDT index 260 */ | |
20 | #define FLAT_RING1_SS 0xe021 /* GDT index 260 */ | |
21 | #define FLAT_RING3_CS 0xe02b /* GDT index 261 */ | |
22 | #define FLAT_RING3_DS 0xe033 /* GDT index 262 */ | |
23 | #define FLAT_RING3_SS 0xe033 /* GDT index 262 */ | |
24 | ||
25 | #define FLAT_KERNEL_CS FLAT_RING1_CS | |
26 | #define FLAT_KERNEL_DS FLAT_RING1_DS | |
27 | #define FLAT_KERNEL_SS FLAT_RING1_SS | |
28 | #define FLAT_USER_CS FLAT_RING3_CS | |
29 | #define FLAT_USER_DS FLAT_RING3_DS | |
30 | #define FLAT_USER_SS FLAT_RING3_SS | |
31 | ||
32 | /* And the trap vector is... */ | |
33 | #define TRAP_INSTR "int $0x82" | |
34 | ||
35 | /* | |
36 | * Virtual addresses beyond this are not modifiable by guest OSes. The | |
37 | * machine->physical mapping table starts at this address, read-only. | |
38 | */ | |
39 | #define __HYPERVISOR_VIRT_START 0xF5800000 | |
40 | ||
41 | #ifndef __ASSEMBLY__ | |
42 | ||
43 | struct cpu_user_regs { | |
44 | uint32_t ebx; | |
45 | uint32_t ecx; | |
46 | uint32_t edx; | |
47 | uint32_t esi; | |
48 | uint32_t edi; | |
49 | uint32_t ebp; | |
50 | uint32_t eax; | |
51 | uint16_t error_code; /* private */ | |
52 | uint16_t entry_vector; /* private */ | |
53 | uint32_t eip; | |
54 | uint16_t cs; | |
55 | uint8_t saved_upcall_mask; | |
56 | uint8_t _pad0; | |
57 | uint32_t eflags; /* eflags.IF == !saved_upcall_mask */ | |
58 | uint32_t esp; | |
59 | uint16_t ss, _pad1; | |
60 | uint16_t es, _pad2; | |
61 | uint16_t ds, _pad3; | |
62 | uint16_t fs, _pad4; | |
63 | uint16_t gs, _pad5; | |
64 | }; | |
65 | DEFINE_GUEST_HANDLE_STRUCT(cpu_user_regs); | |
66 | ||
67 | typedef uint64_t tsc_timestamp_t; /* RDTSC timestamp */ | |
68 | ||
69 | struct arch_vcpu_info { | |
70 | unsigned long cr2; | |
71 | unsigned long pad[5]; /* sizeof(struct vcpu_info) == 64 */ | |
72 | }; | |
73 | ||
74 | struct xen_callback { | |
75 | unsigned long cs; | |
76 | unsigned long eip; | |
77 | }; | |
78 | typedef struct xen_callback xen_callback_t; | |
79 | ||
80 | #define XEN_CALLBACK(__cs, __eip) \ | |
81 | ((struct xen_callback){ .cs = (__cs), .eip = (unsigned long)(__eip) }) | |
82 | #endif /* !__ASSEMBLY__ */ | |
83 | ||
84 | ||
85 | /* | |
86 | * Page-directory addresses above 4GB do not fit into architectural %cr3. | |
87 | * When accessing %cr3, or equivalent field in vcpu_guest_context, guests | |
88 | * must use the following accessor macros to pack/unpack valid MFNs. | |
89 | * | |
90 | * Note that Xen is using the fact that the pagetable base is always | |
91 | * page-aligned, and putting the 12 MSB of the address into the 12 LSB | |
92 | * of cr3. | |
93 | */ | |
94 | #define xen_pfn_to_cr3(pfn) (((unsigned)(pfn) << 12) | ((unsigned)(pfn) >> 20)) | |
95 | #define xen_cr3_to_pfn(cr3) (((unsigned)(cr3) >> 12) | ((unsigned)(cr3) << 20)) | |
96 | ||
1965aae3 | 97 | #endif /* _ASM_X86_XEN__INTERFACE_32_H */ |