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