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/*

 * Copyright (C) 2001-2004 Jakub Jermar

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#ifndef __amd64_PM_H__

#define __amd64_PM_H__

#ifndef __ASM__

# include <arch/types.h>

# include <typedefs.h>

# include <arch/context.h>

#endif

#define IDT_ITEMS 64

#define GDT_ITEMS 8

#define NULL_DES	0

/* Warning: Do not reorder next items, unless you look into syscall.c!!! */

#define KTEXT_DES	1

#define	KDATA_DES	2

#define UDATA_DES	3

#define UTEXT_DES	4

#define KTEXT32_DES     5

/* EndOfWarning */

#define TSS_DES		6

#define gdtselector(des)	((des)<<3)

#define idtselector(des)        ((des)<<4)

#define PL_KERNEL	0

#define PL_USER		3

#define AR_PRESENT	(1<<7)

#define AR_DATA		(2<<3)

#define AR_CODE		(3<<3)

#define AR_WRITABLE	(1<<1)

#define AR_READABLE     (1<<1)

#define AR_TSS		(0x9)

#define AR_INTERRUPT    (0xe)

#define AR_TRAP         (0xf)

#define DPL_KERNEL	(PL_KERNEL<<5)

#define DPL_USER	(PL_USER<<5)

#define TSS_BASIC_SIZE	104

#ifndef __ASM__

struct descriptor {

	unsigned limit_0_15: 16;

	unsigned base_0_15: 16;

	unsigned base_16_23: 8;

	unsigned access: 8;

	unsigned limit_16_19: 4;

	unsigned available: 1;

	unsigned longmode: 1;

	unsigned special: 1;

	unsigned granularity : 1;

	unsigned base_24_31: 8;

} __attribute__ ((packed));

typedef struct descriptor descriptor_t;

struct tss_descriptor {

	unsigned limit_0_15: 16;

	unsigned base_0_15: 16;

	unsigned base_16_23: 8;

	unsigned type: 4;

	unsigned : 1;

	unsigned dpl : 2;

	unsigned present : 1;

	unsigned limit_16_19: 4;

	unsigned available: 1;

	unsigned : 2;

	unsigned granularity : 1;

	unsigned base_24_31: 8;	

	unsigned base_32_63 : 32;

	unsigned  : 32;

} __attribute__ ((packed));

typedef struct tss_descriptor tss_descriptor_t;

struct idescriptor {

	unsigned offset_0_15: 16;

	unsigned selector: 16;

	unsigned ist:3;

	unsigned unused: 5;

	unsigned type: 5;

	unsigned dpl: 2;

	unsigned present : 1;

	unsigned offset_16_31: 16;

	unsigned offset_32_63: 32;

	unsigned  : 32;

} __attribute__ ((packed));

typedef struct idescriptor idescriptor_t;

struct ptr_16_64 {

	__u16 limit;

	__u64 base;

} __attribute__ ((packed));

typedef struct ptr_16_64 ptr_16_64_t;

struct ptr_16_32 {

	__u16 limit;

	__u32 base;

} __attribute__ ((packed));

typedef struct ptr_16_32 ptr_16_32_t;

struct tss {

	__u32 reserve1;

	__u64 rsp0;

	__u64 rsp1;

	__u64 rsp2;

	__u64 reserve2;

	__u64 ist1;

	__u64 ist2;

	__u64 ist3;

	__u64 ist4;

	__u64 ist5;

	__u64 ist6;

	__u64 ist7;

	__u64 reserve3;

	__u16 reserve4;

	__u16 iomap_base;

	__u8 iomap[0x10000 + 1];	/* 64K + 1 terminating byte */

} __attribute__ ((packed));

typedef struct tss tss_t;

extern tss_t *tss_p;

extern descriptor_t gdt[];

extern idescriptor_t idt[];

extern ptr_16_64_t gdtr;

extern ptr_16_32_t bootstrap_gdtr;

extern ptr_16_32_t protected_ap_gdtr;

extern void pm_init(void);

extern void gdt_tss_setbase(descriptor_t *d, __address base);

extern void gdt_tss_setlimit(descriptor_t *d, __u32 limit);

extern void idt_init(void);

extern void idt_setoffset(idescriptor_t *d, __address offset);

extern void tss_initialize(tss_t *t);

#endif /* __ASM__ */

#endif