1 #ifndef _ASM_X86_LGUEST_H
2 #define _ASM_X86_LGUEST_H
3
4 #define GDT_ENTRY_LGUEST_CS 10
5 #define GDT_ENTRY_LGUEST_DS 11
6 #define LGUEST_CS (GDT_ENTRY_LGUEST_CS * 8)
7 #define LGUEST_DS (GDT_ENTRY_LGUEST_DS * 8)
8
9 #ifndef __ASSEMBLY__
10 #include <asm/desc.h>
11
12 #define GUEST_PL 1
13
14 /* Page for Switcher text itself, then two pages per cpu */
15 #define TOTAL_SWITCHER_PAGES (1 + 2 * nr_cpu_ids)
16
17 /* Where we map the Switcher, in both Host and Guest. */
18 extern unsigned long switcher_addr;
19
20 /* Found in switcher.S */
21 extern unsigned long default_idt_entries[];
22
23 /* Declarations for definitions in arch/x86/lguest/head_32.S */
24 extern char lguest_noirq_iret[];
25 extern const char lgstart_cli[], lgend_cli[];
26 extern const char lgstart_pushf[], lgend_pushf[];
27
28 extern void lguest_iret(void);
29 extern void lguest_init(void);
30
31 struct lguest_regs {
32 /* Manually saved part. */
33 unsigned long eax, ebx, ecx, edx;
34 unsigned long esi, edi, ebp;
35 unsigned long gs;
36 unsigned long fs, ds, es;
37 unsigned long trapnum, errcode;
38 /* Trap pushed part */
39 unsigned long eip;
40 unsigned long cs;
41 unsigned long eflags;
42 unsigned long esp;
43 unsigned long ss;
44 };
45
46 /* This is a guest-specific page (mapped ro) into the guest. */
47 struct lguest_ro_state {
48 /* Host information we need to restore when we switch back. */
49 u32 host_cr3;
50 struct desc_ptr host_idt_desc;
51 struct desc_ptr host_gdt_desc;
52 u32 host_sp;
53
54 /* Fields which are used when guest is running. */
55 struct desc_ptr guest_idt_desc;
56 struct desc_ptr guest_gdt_desc;
57 struct x86_hw_tss guest_tss;
58 struct desc_struct guest_idt[IDT_ENTRIES];
59 struct desc_struct guest_gdt[GDT_ENTRIES];
60 };
61
62 struct lg_cpu_arch {
63 /* The GDT entries copied into lguest_ro_state when running. */
64 struct desc_struct gdt[GDT_ENTRIES];
65
66 /* The IDT entries: some copied into lguest_ro_state when running. */
67 struct desc_struct idt[IDT_ENTRIES];
68
69 /* The address of the last guest-visible pagefault (ie. cr2). */
70 unsigned long last_pagefault;
71 };
72
lguest_set_ts(void)73 static inline void lguest_set_ts(void)
74 {
75 u32 cr0;
76
77 cr0 = read_cr0();
78 if (!(cr0 & 8))
79 write_cr0(cr0 | 8);
80 }
81
82 /* Full 4G segment descriptors, suitable for CS and DS. */
83 #define FULL_EXEC_SEGMENT \
84 ((struct desc_struct)GDT_ENTRY_INIT(0xc09b, 0, 0xfffff))
85 #define FULL_SEGMENT ((struct desc_struct)GDT_ENTRY_INIT(0xc093, 0, 0xfffff))
86
87 #endif /* __ASSEMBLY__ */
88
89 #endif /* _ASM_X86_LGUEST_H */
90