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. */
18extern unsigned long switcher_addr;
19
20/* Found in switcher.S */
21extern unsigned long default_idt_entries[];
22
23/* Declarations for definitions in arch/x86/lguest/head_32.S */
24extern char lguest_noirq_iret[];
25extern const char lgstart_cli[], lgend_cli[];
26extern const char lgstart_pushf[], lgend_pushf[];
27
28extern void lguest_iret(void);
29extern void lguest_init(void);
30
31struct 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. */
47struct 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
62struct 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
73static 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