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. */
20extern unsigned long switcher_addr;
21
22/* Found in switcher.S */
23extern unsigned long default_idt_entries[];
24
25/* Declarations for definitions in arch/x86/lguest/head_32.S */
26extern char lguest_noirq_iret[];
27extern const char lgstart_cli[], lgend_cli[];
28extern const char lgstart_pushf[], lgend_pushf[];
29
30extern void lguest_iret(void);
31extern void lguest_init(void);
32
33struct 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. */
49struct 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
64struct 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
75static 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 */