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 /* 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_cpu_ids)
  19
  20 /* We map at -4M (-2M for PAE) for ease of mapping (one PTE page). */
  21 #ifdef CONFIG_X86_PAE
  22 #define SWITCHER_ADDR 0xFFE00000
  23 #else
  24 #define SWITCHER_ADDR 0xFFC00000
  25 #endif
  26
  27 /* Found in switcher.S */
  28 extern unsigned long default_idt_entries[];
  29
  30 /* Declarations for definitions in lguest_guest.S */
  31 extern char lguest_noirq_start[], lguest_noirq_end[];
  32 extern const char lgstart_cli[], lgend_cli[];
  33 extern const char lgstart_sti[], lgend_sti[];
  34 extern const char lgstart_popf[], lgend_popf[];
  35 extern const char lgstart_pushf[], lgend_pushf[];
  36 extern const char lgstart_iret[], lgend_iret[];
  37
  38 extern void lguest_iret(void);
  39 extern void lguest_init(void);
  40
  41 struct lguest_regs {
  42         /* Manually saved part. */
  43         unsigned long eax, ebx, ecx, edx;
  44         unsigned long esi, edi, ebp;
  45         unsigned long gs;
  46         unsigned long fs, ds, es;
  47         unsigned long trapnum, errcode;
  48         /* Trap pushed part */
  49         unsigned long eip;
  50         unsigned long cs;
  51         unsigned long eflags;
  52         unsigned long esp;
  53         unsigned long ss;
  54 };
  55
  56 /* This is a guest-specific page (mapped ro) into the guest. */
  57 struct lguest_ro_state {
  58         /* Host information we need to restore when we switch back. */
  59         u32 host_cr3;
  60         struct desc_ptr host_idt_desc;
  61         struct desc_ptr host_gdt_desc;
  62         u32 host_sp;
  63
  64         /* Fields which are used when guest is running. */
  65         struct desc_ptr guest_idt_desc;
  66         struct desc_ptr guest_gdt_desc;
  67         struct x86_hw_tss guest_tss;
  68         struct desc_struct guest_idt[IDT_ENTRIES];
  69         struct desc_struct guest_gdt[GDT_ENTRIES];
  70 };
  71
  72 struct lg_cpu_arch {
  73         /* The GDT entries copied into lguest_ro_state when running. */
  74         struct desc_struct gdt[GDT_ENTRIES];
  75
  76         /* The IDT entries: some copied into lguest_ro_state when running. */
  77         struct desc_struct idt[IDT_ENTRIES];
  78
  79         /* The address of the last guest-visible pagefault (ie. cr2). */
  80         unsigned long last_pagefault;
  81 };
  82
  83 static inline void lguest_set_ts(void)
  84 {
  85         u32 cr0;
  86
  87         cr0 = read_cr0();
  88         if (!(cr0 & 8))
  89                 write_cr0(cr0 | 8);
  90 }
  91
  92 /* Full 4G segment descriptors, suitable for CS and DS. */
  93 #define FULL_EXEC_SEGMENT ((struct desc_struct){ { {0x0000ffff, 0x00cf9b00} } })
  94 #define FULL_SEGMENT ((struct desc_struct){ { {0x0000ffff, 0x00cf9300} } })
  95
  96 #endif /* __ASSEMBLY__ */
  97
  98 #endif /* _ASM_X86_LGUEST_H */