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