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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

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

#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[TSS_IOMAP_SIZE];

} __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