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#ifndef _X86_LGUEST_H
#define _X86_LGUEST_H
#ifndef __ASSEMBLY__
#include <asm/desc.h>
#define GUEST_PL 1
/* Every guest maps the core switcher code. */
DIV_ROUND_UP(end_switcher_text - start_switcher_text, PAGE_SIZE)
/* Pages for switcher itself, then two pages per cpu */
/* We map at -4M for ease of mapping into the guest (one PTE page). */
#define SWITCHER_ADDR 0xFFC00000
/* Found in switcher.S */
extern unsigned long default_idt_entries[];
/* Declarations for definitions in lguest_guest.S */
extern char lguest_noirq_start[], lguest_noirq_end[];
extern const char lgstart_cli[], lgend_cli[];
extern const char lgstart_sti[], lgend_sti[];
extern const char lgstart_popf[], lgend_popf[];
extern const char lgstart_pushf[], lgend_pushf[];
extern const char lgstart_iret[], lgend_iret[];
extern void lguest_iret(void);
extern void lguest_init(void);
struct lguest_regs {
/* Manually saved part. */
unsigned long eax, ebx, ecx, edx;
unsigned long esi, edi, ebp;
unsigned long gs;
unsigned long fs, ds, es;
unsigned long trapnum, errcode;
/* Trap pushed part */
unsigned long eip;
unsigned long cs;
unsigned long eflags;
unsigned long esp;
unsigned long ss;
/* This is a guest-specific page (mapped ro) into the guest. */
struct lguest_ro_state {
/* Host information we need to restore when we switch back. */
u32 host_cr3;
struct desc_ptr host_idt_desc;
struct desc_ptr host_gdt_desc;
u32 host_sp;
/* Fields which are used when guest is running. */
struct desc_ptr guest_idt_desc;
struct desc_ptr guest_gdt_desc;
struct x86_hw_tss guest_tss;
struct desc_struct guest_idt[IDT_ENTRIES];
struct desc_struct guest_gdt[GDT_ENTRIES];
struct lg_cpu_arch {
/* The GDT entries copied into lguest_ro_state when running. */
struct desc_struct gdt[GDT_ENTRIES];
/* The IDT entries: some copied into lguest_ro_state when running. */
struct desc_struct idt[IDT_ENTRIES];
/* The address of the last guest-visible pagefault (ie. cr2). */
unsigned long last_pagefault;
static inline void lguest_set_ts(void)
u32 cr0;
cr0 = read_cr0();
if (!(cr0 & 8))
write_cr0(cr0 | 8);
/* Full 4G segment descriptors, suitable for CS and DS. */
#define FULL_EXEC_SEGMENT ((struct desc_struct){ { {0x0000ffff, 0x00cf9b00} } })
#define FULL_SEGMENT ((struct desc_struct){ { {0x0000ffff, 0x00cf9300} } })
#endif /* __ASSEMBLY__ */