include/asm-x86/lguest.h

   1 #ifndef _X86_LGUEST_H
   2 #define _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 /* 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)
  19
  20 /* We map at -4M for ease of mapping into the guest (one PTE page). */
  21 #define SWITCHER_ADDR 0xFFC00000
  22
  23 /* Found in switcher.S */
  24 extern unsigned long default_idt_entries[];
  25
  26 struct lguest_regs
  27 {
  28         /* Manually saved part. */
  29         unsigned long ebx, ecx, edx;
  30         unsigned long esi, edi, ebp;
  31         unsigned long gs;
  32         unsigned long eax;
  33         unsigned long fs, ds, es;
  34         unsigned long trapnum, errcode;
  35         /* Trap pushed part */
  36         unsigned long eip;
  37         unsigned long cs;
  38         unsigned long eflags;
  39         unsigned long esp;
  40         unsigned long ss;
  41 };
  42
  43 /* This is a guest-specific page (mapped ro) into the guest. */
  44 struct lguest_ro_state
  45 {
  46         /* Host information we need to restore when we switch back. */
  47         u32 host_cr3;
  48         struct Xgt_desc_struct host_idt_desc;
  49         struct Xgt_desc_struct host_gdt_desc;
  50         u32 host_sp;
  51
  52         /* Fields which are used when guest is running. */
  53         struct Xgt_desc_struct guest_idt_desc;
  54         struct Xgt_desc_struct guest_gdt_desc;
  55         struct i386_hw_tss guest_tss;
  56         struct desc_struct guest_idt[IDT_ENTRIES];
  57         struct desc_struct guest_gdt[GDT_ENTRIES];
  58 };
  59
  60 struct lguest_arch
  61 {
  62         /* The GDT entries copied into lguest_ro_state when running. */
  63         struct desc_struct gdt[GDT_ENTRIES];
  64
  65         /* The IDT entries: some copied into lguest_ro_state when running. */
  66         struct desc_struct idt[IDT_ENTRIES];
  67
  68         /* The address of the last guest-visible pagefault (ie. cr2). */
  69         unsigned long last_pagefault;
  70 };
  71
  72 static inline void lguest_set_ts(void)
  73 {
  74         u32 cr0;
  75
  76         cr0 = read_cr0();
  77         if (!(cr0 & 8))
  78                 write_cr0(cr0|8);
  79 }
  80
  81 /* Full 4G segment descriptors, suitable for CS and DS. */
  82 #define FULL_EXEC_SEGMENT ((struct desc_struct){0x0000ffff, 0x00cf9b00})
  83 #define FULL_SEGMENT ((struct desc_struct){0x0000ffff, 0x00cf9300})
  84
  85 #endif /* __ASSEMBLY__ */
  86
  87 #endif