| 1 | /*
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| 2 | * Copyright (C) 2001-2004 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #ifndef __PM_H__
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| 30 | #define __PM_H__
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| 31 |
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| 32 | #include <arch/types.h>
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| 33 | #include <typedefs.h>
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| 34 | #include <arch/context.h>
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| 35 |
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| 36 | #define IDT_ITEMS 64
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| 37 | #define GDT_ITEMS 6
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| 38 |
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| 39 | #define NULL_DES 0
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| 40 | #define KTEXT_DES 1
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| 41 | #define KDATA_DES 2
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| 42 | #define UTEXT_DES 3
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| 43 | #define UDATA_DES 4
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| 44 | #define TSS_DES 5
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| 45 |
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| 46 | #define selector(des) ((des)<<3)
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| 47 |
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| 48 | #define PL_KERNEL 0
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| 49 | #define PL_USER 3
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| 50 |
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| 51 | #define AR_PRESENT (1<<7)
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| 52 | #define AR_DATA (2<<3)
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| 53 | #define AR_CODE (3<<3)
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| 54 | #define AR_WRITABLE (1<<1)
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| 55 | #define AR_INTERRUPT (0xe)
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| 56 | #define AR_TSS (0x9)
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| 57 |
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| 58 | #define DPL_KERNEL (PL_KERNEL<<5)
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| 59 | #define DPL_USER (PL_USER<<5)
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| 60 |
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| 61 | #define IO_MAP_BASE (104)
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| 62 |
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| 63 | struct ptr_16_32 {
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| 64 | __u16 limit;
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| 65 | __u32 base;
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| 66 | } __attribute__ ((packed));
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| 67 |
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| 68 | struct descriptor {
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| 69 | unsigned limit_0_15: 16;
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| 70 | unsigned base_0_15: 16;
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| 71 | unsigned base_16_23: 8;
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| 72 | unsigned access: 8;
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| 73 | unsigned limit_16_19: 4;
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| 74 | unsigned available: 1;
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| 75 | unsigned unused: 1;
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| 76 | unsigned special: 1;
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| 77 | unsigned granularity : 1;
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| 78 | unsigned base_24_31: 8;
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| 79 | } __attribute__ ((packed));
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| 80 |
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| 81 | struct idescriptor {
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| 82 | unsigned offset_0_15: 16;
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| 83 | unsigned selector: 16;
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| 84 | unsigned unused: 8;
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| 85 | unsigned access: 8;
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| 86 | unsigned offset_16_31: 16;
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| 87 | } __attribute__ ((packed));
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| 88 |
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| 89 |
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| 90 | struct tss {
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| 91 | __u16 link;
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| 92 | unsigned : 16;
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| 93 | __u32 esp0;
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| 94 | __u16 ss0;
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| 95 | unsigned : 16;
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| 96 | __u32 esp1;
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| 97 | __u16 ss1;
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| 98 | unsigned : 16;
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| 99 | __u32 esp2;
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| 100 | __u16 ss2;
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| 101 | unsigned : 16;
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| 102 | __u32 cr3;
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| 103 | __u32 eip;
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| 104 | __u32 eflags;
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| 105 | __u32 eax;
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| 106 | __u32 ecx;
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| 107 | __u32 edx;
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| 108 | __u32 ebx;
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| 109 | __u32 esp;
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| 110 | __u32 ebp;
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| 111 | __u32 esi;
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| 112 | __u32 edi;
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| 113 | __u16 es;
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| 114 | unsigned : 16;
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| 115 | __u16 cs;
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| 116 | unsigned : 16;
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| 117 | __u16 ss;
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| 118 | unsigned : 16;
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| 119 | __u16 ds;
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| 120 | unsigned : 16;
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| 121 | __u16 fs;
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| 122 | unsigned : 16;
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| 123 | __u16 gs;
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| 124 | unsigned : 16;
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| 125 | __u16 ldtr;
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| 126 | unsigned : 16;
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| 127 | unsigned : 16;
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| 128 | __u16 io_map_base;
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| 129 | } __attribute__ ((packed));
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| 130 |
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| 131 | extern struct ptr_16_32 gdtr;
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| 132 | extern struct tss *tss_p;
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| 133 |
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| 134 | extern struct descriptor gdt[];
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| 135 | extern struct idescriptor idt[];
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| 136 |
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| 137 | extern void pm_init(void);
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| 138 |
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| 139 | extern void gdt_setbase(struct descriptor *d, __address base);
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| 140 | extern void gdt_setlimit(struct descriptor *d, __address limit);
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| 141 |
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| 142 | extern void idt_init(void);
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| 143 | extern void idt_setoffset(struct idescriptor *d, __address offset);
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| 144 |
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| 145 | extern void tss_initialize(struct tss *t);
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| 146 |
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| 147 | #endif
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