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 /* Every guest maps the core switcher code. */
15 #define SHARED_SWITCHER_PAGES \
16 DIV_ROUND_UP(end_switcher_text - start_switcher_text, PAGE_SIZE)
17 /* Pages for switcher itself, then two pages per cpu */
18 #define TOTAL_SWITCHER_PAGES (SHARED_SWITCHER_PAGES + 2 * nr_cpu_ids)
19
20 /* We map at -4M (-2M for PAE) for ease of mapping (one PTE page). */
21 #ifdef CONFIG_X86_PAE
22 #define SWITCHER_ADDR 0xFFE00000
23 #else
24 #define SWITCHER_ADDR 0xFFC00000
25 #endif
26
27 /* Found in switcher.S */
28 extern unsigned long default_idt_entries[];
29
30 /* Declarations for definitions in lguest_guest.S */
31 extern char lguest_noirq_start[], lguest_noirq_end[];
32 extern const char lgstart_cli[], lgend_cli[];
33 extern const char lgstart_sti[], lgend_sti[];
34 extern const char lgstart_popf[], lgend_popf[];
35 extern const char lgstart_pushf[], lgend_pushf[];
36 extern const char lgstart_iret[], lgend_iret[];
37
38 extern void lguest_iret(void);
39 extern void lguest_init(void);
40
41 struct lguest_regs {
42 /* Manually saved part. */
43 unsigned long eax, ebx, ecx, edx;
44 unsigned long esi, edi, ebp;
45 unsigned long gs;
46 unsigned long fs, ds, es;
47 unsigned long trapnum, errcode;
48 /* Trap pushed part */
49 unsigned long eip;
50 unsigned long cs;
51 unsigned long eflags;
52 unsigned long esp;
53 unsigned long ss;
54 };
55
56 /* This is a guest-specific page (mapped ro) into the guest. */
57 struct lguest_ro_state {
58 /* Host information we need to restore when we switch back. */
59 u32 host_cr3;
60 struct desc_ptr host_idt_desc;
61 struct desc_ptr host_gdt_desc;
62 u32 host_sp;
63
64 /* Fields which are used when guest is running. */
65 struct desc_ptr guest_idt_desc;
66 struct desc_ptr guest_gdt_desc;
67 struct x86_hw_tss guest_tss;
68 struct desc_struct guest_idt[IDT_ENTRIES];
69 struct desc_struct guest_gdt[GDT_ENTRIES];
70 };
71
72 struct lg_cpu_arch {
73 /* The GDT entries copied into lguest_ro_state when running. */
74 struct desc_struct gdt[GDT_ENTRIES];
75
76 /* The IDT entries: some copied into lguest_ro_state when running. */
77 struct desc_struct idt[IDT_ENTRIES];
78
79 /* The address of the last guest-visible pagefault (ie. cr2). */
80 unsigned long last_pagefault;
81 };
82
lguest_set_ts(void)83 static inline void lguest_set_ts(void)
84 {
85 u32 cr0;
86
87 cr0 = read_cr0();
88 if (!(cr0 & 8))
89 write_cr0(cr0 | 8);
90 }
91
92 /* Full 4G segment descriptors, suitable for CS and DS. */
93 #define FULL_EXEC_SEGMENT \
94 ((struct desc_struct)GDT_ENTRY_INIT(0xc09b, 0, 0xfffff))
95 #define FULL_SEGMENT ((struct desc_struct)GDT_ENTRY_INIT(0xc093, 0, 0xfffff))
96
97 #endif /* __ASSEMBLY__ */
98
99 #endif /* _ASM_X86_LGUEST_H */
100