[linux-2.6-block.git] / arch / x86 / include / asm / lguest.h

#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 SWITCHER_TEXT_PAGES (1)
#define SWITCHER_STACK_PAGES (2 * nr_cpu_ids)
#define TOTAL_SWITCHER_PAGES (SWITCHER_TEXT_PAGES + SWITCHER_STACK_PAGES)

/* 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 arch/x86/lguest/head_32.S */
extern char lguest_noirq_iret[];
extern const char lgstart_cli[], lgend_cli[];
extern const char lgstart_pushf[], lgend_pushf[];

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 */
Commit	Line	Data
1965aae3 PA	1	#ifndef _ASM_X86_LGUEST_H
1965aae3 PA	2	#define _ASM_X86_LGUEST_H
625efab1 JS	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
93a2cdff	14	/* Page for Switcher text itself, then two pages per cpu */
e27d90e8 RR	15	#define SWITCHER_TEXT_PAGES (1)
	16	#define SWITCHER_STACK_PAGES (2 * nr_cpu_ids)
	17	#define TOTAL_SWITCHER_PAGES (SWITCHER_TEXT_PAGES + SWITCHER_STACK_PAGES)
625efab1	18
406a590b RR	19	/* Where we map the Switcher, in both Host and Guest. */
406a590b RR	20	extern unsigned long switcher_addr;
625efab1 JS	21
	22	/* Found in switcher.S */
	23	extern unsigned long default_idt_entries[];
	24
2f921b5b RR	25	/* Declarations for definitions in arch/x86/lguest/head_32.S */
2f921b5b RR	26	extern char lguest_noirq_iret[];
cbc34973	27	extern const char lgstart_cli[], lgend_cli[];
cbc34973	28	extern const char lgstart_pushf[], lgend_pushf[];
cbc34973 HH	29
	30	extern void lguest_iret(void);
	31	extern void lguest_init(void);
	32
fb444c7b	33	struct lguest_regs {
625efab1	34	/* Manually saved part. */
4614a3a3	35	unsigned long eax, ebx, ecx, edx;
625efab1 JS	36	unsigned long esi, edi, ebp;
625efab1 JS	37	unsigned long gs;
625efab1 JS	38	unsigned long fs, ds, es;
	39	unsigned long trapnum, errcode;
	40	/* Trap pushed part */
	41	unsigned long eip;
	42	unsigned long cs;
	43	unsigned long eflags;
	44	unsigned long esp;
	45	unsigned long ss;
	46	};
	47
	48	/* This is a guest-specific page (mapped ro) into the guest. */
fb444c7b	49	struct lguest_ro_state {
625efab1 JS	50	/* Host information we need to restore when we switch back. */
625efab1 JS	51	u32 host_cr3;
6b68f01b GOC	52	struct desc_ptr host_idt_desc;
6b68f01b GOC	53	struct desc_ptr host_gdt_desc;
625efab1 JS	54	u32 host_sp;
	55
	56	/* Fields which are used when guest is running. */
6b68f01b GOC	57	struct desc_ptr guest_idt_desc;
6b68f01b GOC	58	struct desc_ptr guest_gdt_desc;
ca241c75	59	struct x86_hw_tss guest_tss;
625efab1 JS	60	struct desc_struct guest_idt[IDT_ENTRIES];
	61	struct desc_struct guest_gdt[GDT_ENTRIES];
	62	};
	63
fb444c7b	64	struct lg_cpu_arch {
625efab1 JS	65	/* The GDT entries copied into lguest_ro_state when running. */
	66	struct desc_struct gdt[GDT_ENTRIES];
	67
	68	/* The IDT entries: some copied into lguest_ro_state when running. */
	69	struct desc_struct idt[IDT_ENTRIES];
	70
	71	/* The address of the last guest-visible pagefault (ie. cr2). */
	72	unsigned long last_pagefault;
	73	};
	74
	75	static inline void lguest_set_ts(void)
	76	{
	77	u32 cr0;
	78
	79	cr0 = read_cr0();
	80	if (!(cr0 & 8))
fb444c7b	81	write_cr0(cr0 \| 8);
625efab1 JS	82	}
	83
	84	/* Full 4G segment descriptors, suitable for CS and DS. */
1e5de182 AM	85	#define FULL_EXEC_SEGMENT \
	86	((struct desc_struct)GDT_ENTRY_INIT(0xc09b, 0, 0xfffff))
	87	#define FULL_SEGMENT ((struct desc_struct)GDT_ENTRY_INIT(0xc093, 0, 0xfffff))
625efab1 JS	88
	89	#endif /* __ASSEMBLY__ */
	90
1965aae3	91	#endif /* _ASM_X86_LGUEST_H */