tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 */