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