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. */
  20 extern unsigned long switcher_addr;
  21
  22 /* Found in switcher.S */
  23 extern unsigned long default_idt_entries[];
  24
  25 /* Declarations for definitions in arch/x86/lguest/head_32.S */
  26 extern char lguest_noirq_iret[];
  27 extern const char lgstart_cli[], lgend_cli[];
  28 extern const char lgstart_pushf[], lgend_pushf[];
  29
  30 extern void lguest_iret(void);
  31 extern void lguest_init(void);
  32
  33 struct 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. */
  49 struct 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
  64 struct 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
  75 static 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 */