Subversion Repositories HelenOS-historic

Rev

Rev 814 | Rev 1051 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
178 palkovsky 1
/*
2
 * Copyright (C) 2001-2004 Jakub Jermar
799 palkovsky 3
 * Copyright (C) 2005-2006 Ondrej Palkovsky
178 palkovsky 4
 * All rights reserved.
5
 *
6
 * Redistribution and use in source and binary forms, with or without
7
 * modification, are permitted provided that the following conditions
8
 * are met:
9
 *
10
 * - Redistributions of source code must retain the above copyright
11
 *   notice, this list of conditions and the following disclaimer.
12
 * - Redistributions in binary form must reproduce the above copyright
13
 *   notice, this list of conditions and the following disclaimer in the
14
 *   documentation and/or other materials provided with the distribution.
15
 * - The name of the author may not be used to endorse or promote products
16
 *   derived from this software without specific prior written permission.
17
 *
18
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
 */
29
 
30
#include <arch/pm.h>
31
#include <arch/mm/page.h>
32
#include <arch/types.h>
206 palkovsky 33
#include <arch/interrupt.h>
34
#include <arch/asm.h>
576 palkovsky 35
#include <interrupt.h>
178 palkovsky 36
 
206 palkovsky 37
#include <config.h>
178 palkovsky 38
 
206 palkovsky 39
#include <memstr.h>
814 palkovsky 40
#include <mm/slab.h>
206 palkovsky 41
#include <debug.h>
42
 
178 palkovsky 43
/*
44
 * There is no segmentation in long mode so we set up flat mode. In this
45
 * mode, we use, for each privilege level, two segments spanning the
46
 * whole memory. One is for code and one is for data.
47
 */
48
 
49
struct descriptor gdt[GDT_ITEMS] = {
50
    /* NULL descriptor */
51
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
52
    /* KTEXT descriptor */
53
    { .limit_0_15  = 0xffff,
54
      .base_0_15   = 0,
55
      .base_16_23  = 0,
188 palkovsky 56
      .access      = AR_PRESENT | AR_CODE | DPL_KERNEL | AR_READABLE ,
178 palkovsky 57
      .limit_16_19 = 0xf,
58
      .available   = 0,
59
      .longmode    = 1,
188 palkovsky 60
      .special     = 0,
178 palkovsky 61
      .granularity = 1,
62
      .base_24_31  = 0 },
63
    /* KDATA descriptor */
64
    { .limit_0_15  = 0xffff,
65
      .base_0_15   = 0,
66
      .base_16_23  = 0,
67
      .access      = AR_PRESENT | AR_DATA | AR_WRITABLE | DPL_KERNEL,
68
      .limit_16_19 = 0xf,
69
      .available   = 0,
70
      .longmode    = 0,
71
      .special     = 0,
188 palkovsky 72
      .granularity = 1,
178 palkovsky 73
      .base_24_31  = 0 },
803 palkovsky 74
    /* UDATA descriptor */
178 palkovsky 75
    { .limit_0_15  = 0xffff,
76
      .base_0_15   = 0,
77
      .base_16_23  = 0,
803 palkovsky 78
      .access      = AR_PRESENT | AR_DATA | AR_WRITABLE | DPL_USER,
178 palkovsky 79
      .limit_16_19 = 0xf,
80
      .available   = 0,
803 palkovsky 81
      .longmode    = 0,
82
      .special     = 1,
206 palkovsky 83
      .granularity = 1,
178 palkovsky 84
      .base_24_31  = 0 },
803 palkovsky 85
    /* UTEXT descriptor */
178 palkovsky 86
    { .limit_0_15  = 0xffff,
87
      .base_0_15   = 0,
88
      .base_16_23  = 0,
803 palkovsky 89
      .access      = AR_PRESENT | AR_CODE | DPL_USER,
178 palkovsky 90
      .limit_16_19 = 0xf,
91
      .available   = 0,
803 palkovsky 92
      .longmode    = 1,
93
      .special     = 0,
178 palkovsky 94
      .granularity = 1,
95
      .base_24_31  = 0 },
332 palkovsky 96
    /* KTEXT 32-bit protected, for protected mode before long mode */
188 palkovsky 97
    { .limit_0_15  = 0xffff,
98
      .base_0_15   = 0,
99
      .base_16_23  = 0,
100
      .access      = AR_PRESENT | AR_CODE | DPL_KERNEL | AR_READABLE,
101
      .limit_16_19 = 0xf,
102
      .available   = 0,
103
      .longmode    = 0,
277 palkovsky 104
      .special     = 1,
188 palkovsky 105
      .granularity = 1,
106
      .base_24_31  = 0 },
206 palkovsky 107
    /* TSS descriptor - set up will be completed later,
108
     * on AMD64 it is 64-bit - 2 items in table */
109
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
178 palkovsky 110
    { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
111
};
112
 
113
struct idescriptor idt[IDT_ITEMS];
114
 
231 palkovsky 115
struct ptr_16_64 gdtr = {.limit = sizeof(gdt), .base= (__u64) gdt };
116
struct ptr_16_64 idtr = {.limit = sizeof(idt), .base= (__u64) idt };
229 palkovsky 117
 
178 palkovsky 118
static struct tss tss;
208 palkovsky 119
struct tss *tss_p = NULL;
178 palkovsky 120
 
206 palkovsky 121
void gdt_tss_setbase(struct descriptor *d, __address base)
122
{
123
    struct tss_descriptor *td = (struct tss_descriptor *) d;
124
 
125
    td->base_0_15 = base & 0xffff;
126
    td->base_16_23 = ((base) >> 16) & 0xff;
127
    td->base_24_31 = ((base) >> 24) & 0xff;
128
    td->base_32_63 = ((base) >> 32);
129
}
130
 
131
void gdt_tss_setlimit(struct descriptor *d, __u32 limit)
132
{
133
    struct tss_descriptor *td = (struct tss_descriptor *) d;
134
 
135
    td->limit_0_15 = limit & 0xffff;
136
    td->limit_16_19 = (limit >> 16) & 0xf;
137
}
138
 
139
void idt_setoffset(struct idescriptor *d, __address offset)
140
{
141
    /*
142
     * Offset is a linear address.
143
     */
144
    d->offset_0_15 = offset & 0xffff;
145
    d->offset_16_31 = offset >> 16 & 0xffff;
146
    d->offset_32_63 = offset >> 32;
147
}
148
 
149
void tss_initialize(struct tss *t)
150
{
151
    memsetb((__address) t, sizeof(struct tss), 0);
152
}
153
 
154
/*
155
 * This function takes care of proper setup of IDT and IDTR.
156
 */
157
void idt_init(void)
158
{
159
    struct idescriptor *d;
160
    int i;
161
 
162
    for (i = 0; i < IDT_ITEMS; i++) {
163
        d = &idt[i];
164
 
165
        d->unused = 0;
211 palkovsky 166
        d->selector = gdtselector(KTEXT_DES);
206 palkovsky 167
 
168
        d->present = 1;
169
        d->type = AR_INTERRUPT; /* masking interrupt */
170
 
171
        idt_setoffset(d, ((__address) interrupt_handlers) + i*interrupt_handler_size);
799 palkovsky 172
        exc_register(i, "undef", (iroutine)null_interrupt);
206 palkovsky 173
    }
576 palkovsky 174
    exc_register(13, "gp_fault", gp_fault);
175
    exc_register( 7, "nm_fault", nm_fault);
176
    exc_register(12, "ss_fault", ss_fault);
206 palkovsky 177
}
178
 
799 palkovsky 179
/** Initialize segmentation - code/data/idt tables
180
 *
181
 */
206 palkovsky 182
void pm_init(void)
183
{
229 palkovsky 184
    struct descriptor *gdt_p = (struct descriptor *) gdtr.base;
208 palkovsky 185
    struct tss_descriptor *tss_desc;
206 palkovsky 186
 
187
    /*
188
     * Each CPU has its private GDT and TSS.
189
     * All CPUs share one IDT.
190
     */
191
 
192
    if (config.cpu_active == 1) {
193
        idt_init();
194
        /*
195
         * NOTE: bootstrap CPU has statically allocated TSS, because
196
         * the heap hasn't been initialized so far.
197
         */
198
        tss_p = &tss;
199
    }
200
    else {
822 palkovsky 201
        tss_p = (struct tss *) malloc(sizeof(struct tss),FRAME_ATOMIC);
206 palkovsky 202
        if (!tss_p)
203
            panic("could not allocate TSS\n");
204
    }
205
 
206
    tss_initialize(tss_p);
207
 
208 palkovsky 208
    tss_desc = (struct tss_descriptor *) (&gdt_p[TSS_DES]);
209
    tss_desc->present = 1;
210
    tss_desc->type = AR_TSS;
211
    tss_desc->dpl = PL_KERNEL;
206 palkovsky 212
 
213
    gdt_tss_setbase(&gdt_p[TSS_DES], (__address) tss_p);
214
    gdt_tss_setlimit(&gdt_p[TSS_DES], sizeof(struct tss) - 1);
215
 
229 palkovsky 216
    __asm__("lgdt %0" : : "m"(gdtr));
217
    __asm__("lidt %0" : : "m"(idtr));
206 palkovsky 218
    /*
219
     * As of this moment, the current CPU has its own GDT pointing
220
     * to its own TSS. We just need to load the TR register.
221
     */
222
    __asm__("ltr %0" : : "r" ((__u16) gdtselector(TSS_DES)));
223
}