1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/*
* Copyright (c) 2017 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <kern/error.h>
#include <kern/init.h>
#include <kern/intr.h>
#include <kern/kmem.h>
#include <kern/panic.h>
#include <kern/spinlock.h>
#include <machine/cpu.h>
#include <machine/ioapic.h>
#include <machine/lapic.h>
#include <machine/trap.h>
#include <vm/vm_kmem.h>
#define IOAPIC_REG_VERSION 0x01
#define IOAPIC_REG_IOREDTBL 0x10
#define IOAPIC_VERSION_VERSION_MASK 0x000000ff
#define IOAPIC_VERSION_VERSION_SHIFT 0
#define IOAPIC_VERSION_MAXREDIR_MASK 0x00ff0000
#define IOAPIC_VERSION_MAXREDIR_SHIFT 16
#define IOAPIC_ENTLOW_INTRMASK 0x10000
#define IOAPIC_MAX_ENTRIES 24
struct ioapic_map {
uint8_t regsel;
uint8_t _reserved0;
uint8_t _reserved1;
uint8_t _reserved2;
uint32_t _reserved3;
uint32_t _reserved4;
uint32_t _reserved5;
uint32_t win;
};
struct ioapic {
struct spinlock lock;
unsigned int id;
unsigned int apic_id;
unsigned int version;
volatile struct ioapic_map *map;
unsigned int first_intr;
unsigned int last_intr;
};
static unsigned int ioapic_nr_devs;
static uint32_t
ioapic_read(struct ioapic *ioapic, uint8_t reg)
{
ioapic->map->regsel = reg;
return ioapic->map->win;
}
static void
ioapic_write(struct ioapic *ioapic, uint8_t reg, uint32_t value)
{
ioapic->map->regsel = reg;
ioapic->map->win = value;
}
static void
ioapic_write_entry_low(struct ioapic *ioapic, unsigned int id, uint32_t value)
{
assert(id < IOAPIC_MAX_ENTRIES);
ioapic_write(ioapic, IOAPIC_REG_IOREDTBL + (id * 2), value);
}
static void
ioapic_write_entry_high(struct ioapic *ioapic, unsigned int id, uint32_t value)
{
assert(id < IOAPIC_MAX_ENTRIES);
ioapic_write(ioapic, IOAPIC_REG_IOREDTBL + (id * 2) + 1, value);
}
static void
ioapic_intr(struct trap_frame *frame)
{
intr_handle(frame->vector - TRAP_INTR_FIRST);
}
static struct ioapic * __init
ioapic_create(unsigned int apic_id, uintptr_t addr, unsigned int intr_base)
{
struct ioapic *ioapic;
unsigned int i, nr_intrs;
uint32_t value;
ioapic = kmem_alloc(sizeof(*ioapic));
if (ioapic == NULL) {
panic("ioapic: unable to allocate memory for controller");
}
spinlock_init(&ioapic->lock);
ioapic->id = ioapic_nr_devs;
ioapic->apic_id = apic_id;
ioapic->first_intr = intr_base;
ioapic->map = vm_kmem_map_pa(addr, sizeof(*ioapic->map), NULL, NULL);
if (ioapic->map == NULL) {
panic("ioapic: unable to map register window in kernel map");
}
value = ioapic_read(ioapic, IOAPIC_REG_VERSION);
ioapic->version = (value & IOAPIC_VERSION_VERSION_MASK)
>> IOAPIC_VERSION_VERSION_SHIFT;
nr_intrs = ((value & IOAPIC_VERSION_MAXREDIR_MASK)
>> IOAPIC_VERSION_MAXREDIR_SHIFT) + 1;
ioapic->last_intr = ioapic->first_intr + nr_intrs - 1;
if (ioapic->last_intr > (TRAP_INTR_LAST - TRAP_INTR_FIRST)) {
panic("ioapic: invalid interrupt range");
}
for (i = ioapic->first_intr; i < ioapic->last_intr; i++) {
trap_register(TRAP_INTR_FIRST + i, ioapic_intr);
}
printf("ioapic%u: version:%#x intrs:%u-%u\n", ioapic->id,
ioapic->version, ioapic->first_intr, ioapic->last_intr);
ioapic_nr_devs++;
return ioapic;
}
static bool
ioapic_has_intr(const struct ioapic *ioapic, unsigned int intr)
{
return ((intr >= ioapic->first_intr) && (intr <= ioapic->last_intr));
}
static unsigned int
ioapic_compute_id(const struct ioapic *ioapic, unsigned int intr)
{
assert(ioapic_has_intr(ioapic, intr));
return intr - ioapic->first_intr;
}
static void
ioapic_enable(void *priv, unsigned int intr, unsigned int cpu)
{
struct ioapic *ioapic;
unsigned long flags;
unsigned int id;
ioapic = priv;
id = ioapic_compute_id(ioapic, intr);
spinlock_lock_intr_save(&ioapic->lock, &flags);
ioapic_write_entry_high(ioapic, id, cpu_apic_id(cpu) << 24);
ioapic_write_entry_low(ioapic, id, TRAP_INTR_FIRST + intr);
spinlock_unlock_intr_restore(&ioapic->lock, flags);
}
static void
ioapic_disable(void *priv, unsigned int intr)
{
struct ioapic *ioapic;
unsigned long flags;
unsigned int id;
ioapic = priv;
id = ioapic_compute_id(ioapic, intr);
spinlock_lock_intr_save(&ioapic->lock, &flags);
ioapic_write_entry_low(ioapic, id, IOAPIC_ENTLOW_INTRMASK);
spinlock_unlock_intr_restore(&ioapic->lock, flags);
}
static void
ioapic_eoi(void *priv, unsigned int intr)
{
(void)priv;
(void)intr;
lapic_eoi();
}
static const struct intr_ops ioapic_ops = {
.enable = ioapic_enable,
.disable = ioapic_disable,
.eoi = ioapic_eoi,
};
void __init
ioapic_register(unsigned int apic_id, uintptr_t addr, unsigned int intr_base)
{
struct ioapic *ioapic;
ioapic = ioapic_create(apic_id, addr, intr_base);
intr_register_ctl(&ioapic_ops, ioapic,
ioapic->first_intr, ioapic->last_intr);
}
|
