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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 __PM_H__

#define __PM_H__

#define IDT_ITEMS 64

#define GDT_ITEMS 7

#define NULL_DES	0

#define KTEXT_DES	1

#define	KDATA_DES	2

#define UTEXT_DES	3

#define UDATA_DES	4

#define TSS_DES		5

#define TLS_DES         6 /* Pointer to Thread-Local-Storage data */

#define selector(des)	((des)<<3)

#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_INTERRUPT	(0xe)

#define AR_TSS		(0x9)

#define DPL_KERNEL	(PL_KERNEL<<5)

#define DPL_USER	(PL_USER<<5)

#define TSS_BASIC_SIZE	104

#define TSS_IOMAP_SIZE	(16*1024+1)	/* 16K for bitmap + 1 terminating byte for convenience */

#ifndef __ASM__

#include <arch/types.h>

#include <typedefs.h>

#include <arch/context.h>

struct ptr_16_32 {

	__u16 limit;

	__u32 base;

} __attribute__ ((packed));

typedef struct ptr_16_32 ptr_16_32_t;

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 unused: 1;

	unsigned special: 1;

	unsigned granularity : 1;

	unsigned base_24_31: 8;

} __attribute__ ((packed));

typedef struct descriptor  descriptor_t;

struct idescriptor {

	unsigned offset_0_15: 16;

	unsigned selector: 16;

	unsigned unused: 8;

	unsigned access: 8;

	unsigned offset_16_31: 16;

} __attribute__ ((packed));

typedef struct idescriptor idescriptor_t;

struct tss {

	__u16 link;

	unsigned : 16;

	__u32 esp0;

	__u16 ss0;

	unsigned : 16;

	__u32 esp1;

	__u16 ss1;

	unsigned : 16;

	__u32 esp2;

	__u16 ss2;

	unsigned : 16;

	__u32 cr3;

	__u32 eip;

	__u32 eflags;

	__u32 eax;

	__u32 ecx;

	__u32 edx;

	__u32 ebx;

	__u32 esp;

	__u32 ebp;

	__u32 esi;

	__u32 edi;

	__u16 es;

	unsigned : 16;

	__u16 cs;

	unsigned : 16;

	__u16 ss;

	unsigned : 16;

	__u16 ds;

	unsigned : 16;

	__u16 fs;

	unsigned : 16;

	__u16 gs;

	unsigned : 16;

	__u16 ldtr;

	unsigned : 16;

	unsigned : 16;

	__u16 iomap_base;

	__u8 iomap[TSS_IOMAP_SIZE];

} __attribute__ ((packed));

typedef struct tss tss_t;

extern ptr_16_32_t gdtr;

extern ptr_16_32_t bootstrap_gdtr;

extern ptr_16_32_t protected_ap_gdtr;

extern struct tss *tss_p;

extern descriptor_t gdt[];

extern void pm_init(void);

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

extern void gdt_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);

extern void set_tls_desc(__address tls);

#endif /* __ASM__ */

#endif