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 TOTAL_SWITCHER_PAGES (1 + 2 * nr_cpu_ids)
  16
  17 /* Where we map the Switcher, in both Host and Guest. */
  18 extern unsigned long switcher_addr;
  19
  20 /* Found in switcher.S */
  21 extern unsigned long default_idt_entries[];
  22
  23 /* Declarations for definitions in arch/x86/lguest/head_32.S */
  24 extern char lguest_noirq_iret[];
  25 extern const char lgstart_cli[], lgend_cli[];
  26 extern const char lgstart_pushf[], lgend_pushf[];
  27
  28 extern void lguest_iret(void);
  29 extern void lguest_init(void);
  30
  31 struct lguest_regs {
  32         /* Manually saved part. */
  33         unsigned long eax, ebx, ecx, edx;
  34         unsigned long esi, edi, ebp;
  35         unsigned long gs;
  36         unsigned long fs, ds, es;
  37         unsigned long trapnum, errcode;
  38         /* Trap pushed part */
  39         unsigned long eip;
  40         unsigned long cs;
  41         unsigned long eflags;
  42         unsigned long esp;
  43         unsigned long ss;
  44 };
  45
  46 /* This is a guest-specific page (mapped ro) into the guest. */
  47 struct lguest_ro_state {
  48         /* Host information we need to restore when we switch back. */
  49         u32 host_cr3;
  50         struct desc_ptr host_idt_desc;
  51         struct desc_ptr host_gdt_desc;
  52         u32 host_sp;
  53
  54         /* Fields which are used when guest is running. */
  55         struct desc_ptr guest_idt_desc;
  56         struct desc_ptr guest_gdt_desc;
  57         struct x86_hw_tss guest_tss;
  58         struct desc_struct guest_idt[IDT_ENTRIES];
  59         struct desc_struct guest_gdt[GDT_ENTRIES];
  60 };
  61
  62 struct lg_cpu_arch {
  63         /* The GDT entries copied into lguest_ro_state when running. */
  64         struct desc_struct gdt[GDT_ENTRIES];
  65
  66         /* The IDT entries: some copied into lguest_ro_state when running. */
  67         struct desc_struct idt[IDT_ENTRIES];
  68
  69         /* The address of the last guest-visible pagefault (ie. cr2). */
  70         unsigned long last_pagefault;
  71 };
  72
  73 static inline void lguest_set_ts(void)
  74 {
  75         u32 cr0;
  76
  77         cr0 = read_cr0();
  78         if (!(cr0 & 8))
  79                 write_cr0(cr0 | 8);
  80 }
  81
  82 /* Full 4G segment descriptors, suitable for CS and DS. */
  83 #define FULL_EXEC_SEGMENT \
  84         ((struct desc_struct)GDT_ENTRY_INIT(0xc09b, 0, 0xfffff))
  85 #define FULL_SEGMENT ((struct desc_struct)GDT_ENTRY_INIT(0xc093, 0, 0xfffff))
  86
  87 #endif /* __ASSEMBLY__ */
  88
  89 #endif /* _ASM_X86_LGUEST_H */