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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