[MIPS] Fix another trap decoding issue
[linux-2.6/linux-mips/linux-dm7025.git] / include / asm-x86 / lguest.h
blobbe4a7247fa2b3ea44c07332bf76436d0cb6cc7df
1 #ifndef _X86_LGUEST_H
2 #define _X86_LGUEST_H
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)
9 #ifndef __ASSEMBLY__
10 #include <asm/desc.h>
12 #define GUEST_PL 1
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_CPUS)
20 /* We map at -4M for ease of mapping into the guest (one PTE page). */
21 #define SWITCHER_ADDR 0xFFC00000
23 /* Found in switcher.S */
24 extern unsigned long default_idt_entries[];
26 /* Declarations for definitions in lguest_guest.S */
27 extern char lguest_noirq_start[], lguest_noirq_end[];
28 extern const char lgstart_cli[], lgend_cli[];
29 extern const char lgstart_sti[], lgend_sti[];
30 extern const char lgstart_popf[], lgend_popf[];
31 extern const char lgstart_pushf[], lgend_pushf[];
32 extern const char lgstart_iret[], lgend_iret[];
34 extern void lguest_iret(void);
35 extern void lguest_init(void);
37 struct lguest_regs {
38 /* Manually saved part. */
39 unsigned long eax, ebx, ecx, edx;
40 unsigned long esi, edi, ebp;
41 unsigned long gs;
42 unsigned long fs, ds, es;
43 unsigned long trapnum, errcode;
44 /* Trap pushed part */
45 unsigned long eip;
46 unsigned long cs;
47 unsigned long eflags;
48 unsigned long esp;
49 unsigned long ss;
52 /* This is a guest-specific page (mapped ro) into the guest. */
53 struct lguest_ro_state {
54 /* Host information we need to restore when we switch back. */
55 u32 host_cr3;
56 struct desc_ptr host_idt_desc;
57 struct desc_ptr host_gdt_desc;
58 u32 host_sp;
60 /* Fields which are used when guest is running. */
61 struct desc_ptr guest_idt_desc;
62 struct desc_ptr guest_gdt_desc;
63 struct x86_hw_tss guest_tss;
64 struct desc_struct guest_idt[IDT_ENTRIES];
65 struct desc_struct guest_gdt[GDT_ENTRIES];
68 struct lg_cpu_arch {
69 /* The GDT entries copied into lguest_ro_state when running. */
70 struct desc_struct gdt[GDT_ENTRIES];
72 /* The IDT entries: some copied into lguest_ro_state when running. */
73 struct desc_struct idt[IDT_ENTRIES];
75 /* The address of the last guest-visible pagefault (ie. cr2). */
76 unsigned long last_pagefault;
79 static inline void lguest_set_ts(void)
81 u32 cr0;
83 cr0 = read_cr0();
84 if (!(cr0 & 8))
85 write_cr0(cr0 | 8);
88 /* Full 4G segment descriptors, suitable for CS and DS. */
89 #define FULL_EXEC_SEGMENT ((struct desc_struct){ { {0x0000ffff, 0x00cf9b00} } })
90 #define FULL_SEGMENT ((struct desc_struct){ { {0x0000ffff, 0x00cf9300} } })
92 #endif /* __ASSEMBLY__ */
94 #endif