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