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1 jermar 1
/*
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 * Copyright (C) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#ifndef __PM_H__
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#define __PM_H__
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#include <arch/types.h>
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#include <typedefs.h>
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#include <arch/context.h>
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#define IDT_ITEMS 64
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#define GDT_ITEMS 6
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#define NULL_DES    0
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#define KTEXT_DES   1
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#define KDATA_DES   2
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#define UTEXT_DES   3
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#define UDATA_DES   4
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#define TSS_DES     5
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#define selector(des)   ((des)<<3)
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#define PL_KERNEL   0
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#define PL_USER     3
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#define AR_PRESENT  (1<<7)
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#define AR_DATA     (2<<3)
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#define AR_CODE     (3<<3)
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#define AR_WRITABLE (1<<1)
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#define AR_INTERRUPT    (0xe)
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#define AR_TSS      (0x9)
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#define DPL_KERNEL  (PL_KERNEL<<5)
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#define DPL_USER    (PL_USER<<5)
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#define IO_MAP_BASE (104)
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struct ptr_16_32 {
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    __u16 limit;
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    __u32 base;
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} __attribute__ ((packed));
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struct descriptor {
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    unsigned limit_0_15: 16;
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    unsigned base_0_15: 16;
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    unsigned base_16_23: 8;
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    unsigned access: 8;
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    unsigned limit_16_19: 4;
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    unsigned available: 1;
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    unsigned unused: 1;
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    unsigned special: 1;
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    unsigned granularity : 1;
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    unsigned base_24_31: 8;
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} __attribute__ ((packed));
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struct idescriptor {
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    unsigned offset_0_15: 16;
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    unsigned selector: 16;
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    unsigned unused: 8;
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    unsigned access: 8;
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    unsigned offset_16_31: 16;
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} __attribute__ ((packed));
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struct tss {
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    __u16 link;
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    unsigned : 16;
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    __u32 esp0;
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    __u16 ss0;
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    unsigned : 16;
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    __u32 esp1;
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    __u16 ss1;
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    unsigned : 16;
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    __u32 esp2;
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    __u16 ss2;
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    unsigned : 16;
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    __u32 cr3;
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    __u32 eip;
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    __u32 eflags;
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    __u32 eax;
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    __u32 ecx;
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    __u32 edx;
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    __u32 ebx;
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    __u32 esp;
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    __u32 ebp;
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    __u32 esi;
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    __u32 edi;
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    __u16 es;
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    unsigned : 16;
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    __u16 cs;
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    unsigned : 16;
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    __u16 ss;
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    unsigned : 16;
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    __u16 ds;
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    unsigned : 16;
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    __u16 fs;
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    unsigned : 16;
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    __u16 gs;
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    unsigned : 16;
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    __u16 ldtr;
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    unsigned : 16;
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    unsigned : 16;
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    __u16 io_map_base;
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} __attribute__ ((packed));
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extern struct ptr_16_32 gdtr;
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extern struct tss *tss_p;
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extern struct descriptor gdt[];
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extern void pm_init(void);
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extern void gdt_setbase(struct descriptor *d, __address base);
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extern void gdt_setlimit(struct descriptor *d, __u32 limit);
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extern void idt_init(void);
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extern void idt_setoffset(struct idescriptor *d, __address offset);
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extern void tss_initialize(struct tss *t);
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#endif