LXR linux/arch/x86/include/asm/lguest.h

   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 */
  92