#ifndef _ASM_X86_LGUEST_H
#define _ASM_X86_LGUEST_H

#define GDT_ENTRY_LGUEST_CS 10
#define GDT_ENTRY_LGUEST_DS 11
#define LGUEST_CS (GDT_ENTRY_LGUEST_CS * 8)
#define LGUEST_DS (GDT_ENTRY_LGUEST_DS * 8)

#ifndef __ASSEMBLY__
#include <asm/desc.h>

#define GUEST_PL 1

/* Page for Switcher text itself, then two pages per cpu */
#define TOTAL_SWITCHER_PAGES (1 + 2 * nr_cpu_ids)

/* Where we map the Switcher, in both Host and Guest. */
extern unsigned long switcher_addr;

/* 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)GDT_ENTRY_INIT(0xc09b, 0, 0xfffff))
#define FULL_SEGMENT ((struct desc_struct)GDT_ENTRY_INIT(0xc093, 0, 0xfffff))

#endif /* __ASSEMBLY__ */

#endif /* _ASM_X86_LGUEST_H */