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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__

#include <arch/types.h>
#include <typedefs.h>
#include <arch/context.h>

#define IDT_ITEMS 64
#define GDT_ITEMS 6

#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 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 IO_MAP_BASE (104)

struct ptr_16_32 {
    __u16 limit;
    __u32 base;
} __attribute__ ((packed));

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));

struct idescriptor {
    unsigned offset_0_15: 16;
    unsigned selector: 16;
    unsigned unused: 8;
    unsigned access: 8;
    unsigned offset_16_31: 16;
} __attribute__ ((packed));


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 io_map_base;
} __attribute__ ((packed));

extern struct ptr_16_32 gdtr;
extern struct ptr_16_32 real_bootstrap_gdtr;
extern struct ptr_16_32 protected_bootstrap_gdtr;
extern struct tss *tss_p;

extern struct descriptor gdt[];

extern void pm_init(void);

extern void gdt_setbase(struct descriptor *d, __address base);
extern void gdt_setlimit(struct descriptor *d, __u32 limit);

extern void idt_init(void);
extern void idt_setoffset(struct idescriptor *d, __address offset);

extern void tss_initialize(struct tss *t);

#endif