LXR linux/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 */
  28extern unsigned long default_idt_entries[];
  29
  30/* Declarations for definitions in lguest_guest.S */
  31extern char lguest_noirq_start[], lguest_noirq_end[];
  32extern const char lgstart_cli[], lgend_cli[];
  33extern const char lgstart_sti[], lgend_sti[];
  34extern const char lgstart_popf[], lgend_popf[];
  35extern const char lgstart_pushf[], lgend_pushf[];
  36extern const char lgstart_iret[], lgend_iret[];
  37
  38extern void lguest_iret(void);
  39extern void lguest_init(void);
  40
  41struct 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. */
  57struct 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
  72struct 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
  83static 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 \
  94        ((struct desc_struct)GDT_ENTRY_INIT(0xc09b, 0, 0xfffff))
  95#define FULL_SEGMENT ((struct desc_struct)GDT_ENTRY_INIT(0xc093, 0, 0xfffff))
  96
  97#endif /* __ASSEMBLY__ */
  98
  99#endif /* _ASM_X86_LGUEST_H */
 100