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1 | 610626af | aliguori | /*
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2 | 610626af | aliguori | * ioapic.c IOAPIC emulation logic
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3 | 610626af | aliguori | *
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4 | 610626af | aliguori | * Copyright (c) 2004-2005 Fabrice Bellard
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5 | 610626af | aliguori | *
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6 | 610626af | aliguori | * Split the ioapic logic from apic.c
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7 | 610626af | aliguori | * Xiantao Zhang <xiantao.zhang@intel.com>
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8 | 610626af | aliguori | *
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9 | 610626af | aliguori | * This library is free software; you can redistribute it and/or
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10 | 610626af | aliguori | * modify it under the terms of the GNU Lesser General Public
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11 | 610626af | aliguori | * License as published by the Free Software Foundation; either
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12 | 610626af | aliguori | * version 2 of the License, or (at your option) any later version.
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13 | 610626af | aliguori | *
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14 | 610626af | aliguori | * This library is distributed in the hope that it will be useful,
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15 | 610626af | aliguori | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 | 610626af | aliguori | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 | 610626af | aliguori | * Lesser General Public License for more details.
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18 | 610626af | aliguori | *
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19 | 610626af | aliguori | * You should have received a copy of the GNU Lesser General Public
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20 | 8167ee88 | Blue Swirl | * License along with this library; if not, see <http://www.gnu.org/licenses/>.
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21 | 610626af | aliguori | */
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22 | 610626af | aliguori | |
23 | 610626af | aliguori | #include "hw.h" |
24 | 610626af | aliguori | #include "pc.h" |
25 | 610626af | aliguori | #include "qemu-timer.h" |
26 | 610626af | aliguori | #include "host-utils.h" |
27 | 610626af | aliguori | |
28 | 610626af | aliguori | //#define DEBUG_IOAPIC
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29 | 610626af | aliguori | |
30 | 610626af | aliguori | #define IOAPIC_NUM_PINS 0x18 |
31 | 610626af | aliguori | #define IOAPIC_LVT_MASKED (1<<16) |
32 | 610626af | aliguori | |
33 | 610626af | aliguori | #define IOAPIC_TRIGGER_EDGE 0 |
34 | 610626af | aliguori | #define IOAPIC_TRIGGER_LEVEL 1 |
35 | 610626af | aliguori | |
36 | 610626af | aliguori | /*io{apic,sapic} delivery mode*/
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37 | 610626af | aliguori | #define IOAPIC_DM_FIXED 0x0 |
38 | 610626af | aliguori | #define IOAPIC_DM_LOWEST_PRIORITY 0x1 |
39 | 610626af | aliguori | #define IOAPIC_DM_PMI 0x2 |
40 | 610626af | aliguori | #define IOAPIC_DM_NMI 0x4 |
41 | 610626af | aliguori | #define IOAPIC_DM_INIT 0x5 |
42 | 610626af | aliguori | #define IOAPIC_DM_SIPI 0x5 |
43 | 610626af | aliguori | #define IOAPIC_DM_EXTINT 0x7 |
44 | 610626af | aliguori | |
45 | 610626af | aliguori | struct IOAPICState {
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46 | 610626af | aliguori | uint8_t id; |
47 | 610626af | aliguori | uint8_t ioregsel; |
48 | 610626af | aliguori | |
49 | 610626af | aliguori | uint32_t irr; |
50 | 610626af | aliguori | uint64_t ioredtbl[IOAPIC_NUM_PINS]; |
51 | 610626af | aliguori | }; |
52 | 610626af | aliguori | |
53 | 610626af | aliguori | static void ioapic_service(IOAPICState *s) |
54 | 610626af | aliguori | { |
55 | 610626af | aliguori | uint8_t i; |
56 | 610626af | aliguori | uint8_t trig_mode; |
57 | 610626af | aliguori | uint8_t vector; |
58 | 610626af | aliguori | uint8_t delivery_mode; |
59 | 610626af | aliguori | uint32_t mask; |
60 | 610626af | aliguori | uint64_t entry; |
61 | 610626af | aliguori | uint8_t dest; |
62 | 610626af | aliguori | uint8_t dest_mode; |
63 | 610626af | aliguori | uint8_t polarity; |
64 | 610626af | aliguori | |
65 | 610626af | aliguori | for (i = 0; i < IOAPIC_NUM_PINS; i++) { |
66 | 610626af | aliguori | mask = 1 << i;
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67 | 610626af | aliguori | if (s->irr & mask) {
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68 | 610626af | aliguori | entry = s->ioredtbl[i]; |
69 | 610626af | aliguori | if (!(entry & IOAPIC_LVT_MASKED)) {
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70 | 610626af | aliguori | trig_mode = ((entry >> 15) & 1); |
71 | 610626af | aliguori | dest = entry >> 56;
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72 | 610626af | aliguori | dest_mode = (entry >> 11) & 1; |
73 | 610626af | aliguori | delivery_mode = (entry >> 8) & 7; |
74 | 610626af | aliguori | polarity = (entry >> 13) & 1; |
75 | 610626af | aliguori | if (trig_mode == IOAPIC_TRIGGER_EDGE)
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76 | 610626af | aliguori | s->irr &= ~mask; |
77 | 610626af | aliguori | if (delivery_mode == IOAPIC_DM_EXTINT)
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78 | 610626af | aliguori | vector = pic_read_irq(isa_pic); |
79 | 610626af | aliguori | else
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80 | 610626af | aliguori | vector = entry & 0xff;
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81 | 610626af | aliguori | |
82 | 610626af | aliguori | apic_deliver_irq(dest, dest_mode, delivery_mode, |
83 | 610626af | aliguori | vector, polarity, trig_mode); |
84 | 610626af | aliguori | } |
85 | 610626af | aliguori | } |
86 | 610626af | aliguori | } |
87 | 610626af | aliguori | } |
88 | 610626af | aliguori | |
89 | 610626af | aliguori | void ioapic_set_irq(void *opaque, int vector, int level) |
90 | 610626af | aliguori | { |
91 | 610626af | aliguori | IOAPICState *s = opaque; |
92 | 610626af | aliguori | |
93 | 610626af | aliguori | /* ISA IRQs map to GSI 1-1 except for IRQ0 which maps
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94 | 610626af | aliguori | * to GSI 2. GSI maps to ioapic 1-1. This is not
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95 | 610626af | aliguori | * the cleanest way of doing it but it should work. */
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96 | 610626af | aliguori | |
97 | 610626af | aliguori | if (vector == 0) |
98 | 610626af | aliguori | vector = 2;
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99 | 610626af | aliguori | |
100 | 610626af | aliguori | if (vector >= 0 && vector < IOAPIC_NUM_PINS) { |
101 | 610626af | aliguori | uint32_t mask = 1 << vector;
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102 | 610626af | aliguori | uint64_t entry = s->ioredtbl[vector]; |
103 | 610626af | aliguori | |
104 | 610626af | aliguori | if ((entry >> 15) & 1) { |
105 | 610626af | aliguori | /* level triggered */
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106 | 610626af | aliguori | if (level) {
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107 | 610626af | aliguori | s->irr |= mask; |
108 | 610626af | aliguori | ioapic_service(s); |
109 | 610626af | aliguori | } else {
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110 | 610626af | aliguori | s->irr &= ~mask; |
111 | 610626af | aliguori | } |
112 | 610626af | aliguori | } else {
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113 | 610626af | aliguori | /* edge triggered */
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114 | 610626af | aliguori | if (level) {
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115 | 610626af | aliguori | s->irr |= mask; |
116 | 610626af | aliguori | ioapic_service(s); |
117 | 610626af | aliguori | } |
118 | 610626af | aliguori | } |
119 | 610626af | aliguori | } |
120 | 610626af | aliguori | } |
121 | 610626af | aliguori | |
122 | c227f099 | Anthony Liguori | static uint32_t ioapic_mem_readl(void *opaque, target_phys_addr_t addr) |
123 | 610626af | aliguori | { |
124 | 610626af | aliguori | IOAPICState *s = opaque; |
125 | 610626af | aliguori | int index;
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126 | 610626af | aliguori | uint32_t val = 0;
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127 | 610626af | aliguori | |
128 | 610626af | aliguori | addr &= 0xff;
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129 | 610626af | aliguori | if (addr == 0x00) { |
130 | 610626af | aliguori | val = s->ioregsel; |
131 | 610626af | aliguori | } else if (addr == 0x10) { |
132 | 610626af | aliguori | switch (s->ioregsel) {
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133 | 610626af | aliguori | case 0x00: |
134 | 610626af | aliguori | val = s->id << 24;
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135 | 610626af | aliguori | break;
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136 | 610626af | aliguori | case 0x01: |
137 | 610626af | aliguori | val = 0x11 | ((IOAPIC_NUM_PINS - 1) << 16); /* version 0x11 */ |
138 | 610626af | aliguori | break;
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139 | 610626af | aliguori | case 0x02: |
140 | 610626af | aliguori | val = 0;
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141 | 610626af | aliguori | break;
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142 | 610626af | aliguori | default:
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143 | 610626af | aliguori | index = (s->ioregsel - 0x10) >> 1; |
144 | 610626af | aliguori | if (index >= 0 && index < IOAPIC_NUM_PINS) { |
145 | 610626af | aliguori | if (s->ioregsel & 1) |
146 | 610626af | aliguori | val = s->ioredtbl[index] >> 32;
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147 | 610626af | aliguori | else
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148 | 610626af | aliguori | val = s->ioredtbl[index] & 0xffffffff;
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149 | 610626af | aliguori | } |
150 | 610626af | aliguori | } |
151 | 610626af | aliguori | #ifdef DEBUG_IOAPIC
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152 | 610626af | aliguori | printf("I/O APIC read: %08x = %08x\n", s->ioregsel, val);
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153 | 610626af | aliguori | #endif
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154 | 610626af | aliguori | } |
155 | 610626af | aliguori | return val;
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156 | 610626af | aliguori | } |
157 | 610626af | aliguori | |
158 | c227f099 | Anthony Liguori | static void ioapic_mem_writel(void *opaque, target_phys_addr_t addr, uint32_t val) |
159 | 610626af | aliguori | { |
160 | 610626af | aliguori | IOAPICState *s = opaque; |
161 | 610626af | aliguori | int index;
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162 | 610626af | aliguori | |
163 | 610626af | aliguori | addr &= 0xff;
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164 | 610626af | aliguori | if (addr == 0x00) { |
165 | 610626af | aliguori | s->ioregsel = val; |
166 | 610626af | aliguori | return;
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167 | 610626af | aliguori | } else if (addr == 0x10) { |
168 | 610626af | aliguori | #ifdef DEBUG_IOAPIC
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169 | 610626af | aliguori | printf("I/O APIC write: %08x = %08x\n", s->ioregsel, val);
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170 | 610626af | aliguori | #endif
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171 | 610626af | aliguori | switch (s->ioregsel) {
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172 | 610626af | aliguori | case 0x00: |
173 | 610626af | aliguori | s->id = (val >> 24) & 0xff; |
174 | 610626af | aliguori | return;
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175 | 610626af | aliguori | case 0x01: |
176 | 610626af | aliguori | case 0x02: |
177 | 610626af | aliguori | return;
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178 | 610626af | aliguori | default:
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179 | 610626af | aliguori | index = (s->ioregsel - 0x10) >> 1; |
180 | 610626af | aliguori | if (index >= 0 && index < IOAPIC_NUM_PINS) { |
181 | 610626af | aliguori | if (s->ioregsel & 1) { |
182 | 610626af | aliguori | s->ioredtbl[index] &= 0xffffffff;
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183 | 610626af | aliguori | s->ioredtbl[index] |= (uint64_t)val << 32;
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184 | 610626af | aliguori | } else {
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185 | 610626af | aliguori | s->ioredtbl[index] &= ~0xffffffffULL;
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186 | 610626af | aliguori | s->ioredtbl[index] |= val; |
187 | 610626af | aliguori | } |
188 | 610626af | aliguori | ioapic_service(s); |
189 | 610626af | aliguori | } |
190 | 610626af | aliguori | } |
191 | 610626af | aliguori | } |
192 | 610626af | aliguori | } |
193 | 610626af | aliguori | |
194 | 3e9e9888 | Juan Quintela | static const VMStateDescription vmstate_ioapic = { |
195 | 3e9e9888 | Juan Quintela | .name = "ioapic",
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196 | 3e9e9888 | Juan Quintela | .version_id = 1,
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197 | 3e9e9888 | Juan Quintela | .minimum_version_id = 1,
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198 | 3e9e9888 | Juan Quintela | .minimum_version_id_old = 1,
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199 | 3e9e9888 | Juan Quintela | .fields = (VMStateField []) { |
200 | 3e9e9888 | Juan Quintela | VMSTATE_UINT8(id, IOAPICState), |
201 | 3e9e9888 | Juan Quintela | VMSTATE_UINT8(ioregsel, IOAPICState), |
202 | 3e9e9888 | Juan Quintela | VMSTATE_UINT64_ARRAY(ioredtbl, IOAPICState, IOAPIC_NUM_PINS), |
203 | 3e9e9888 | Juan Quintela | VMSTATE_END_OF_LIST() |
204 | 610626af | aliguori | } |
205 | 3e9e9888 | Juan Quintela | }; |
206 | 610626af | aliguori | |
207 | 610626af | aliguori | static void ioapic_reset(void *opaque) |
208 | 610626af | aliguori | { |
209 | 610626af | aliguori | IOAPICState *s = opaque; |
210 | 610626af | aliguori | int i;
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211 | 610626af | aliguori | |
212 | 610626af | aliguori | memset(s, 0, sizeof(*s)); |
213 | 610626af | aliguori | for(i = 0; i < IOAPIC_NUM_PINS; i++) |
214 | 610626af | aliguori | s->ioredtbl[i] = 1 << 16; /* mask LVT */ |
215 | 610626af | aliguori | } |
216 | 610626af | aliguori | |
217 | d60efc6b | Blue Swirl | static CPUReadMemoryFunc * const ioapic_mem_read[3] = { |
218 | 610626af | aliguori | ioapic_mem_readl, |
219 | 610626af | aliguori | ioapic_mem_readl, |
220 | 610626af | aliguori | ioapic_mem_readl, |
221 | 610626af | aliguori | }; |
222 | 610626af | aliguori | |
223 | d60efc6b | Blue Swirl | static CPUWriteMemoryFunc * const ioapic_mem_write[3] = { |
224 | 610626af | aliguori | ioapic_mem_writel, |
225 | 610626af | aliguori | ioapic_mem_writel, |
226 | 610626af | aliguori | ioapic_mem_writel, |
227 | 610626af | aliguori | }; |
228 | 610626af | aliguori | |
229 | 1632dc6a | Avi Kivity | qemu_irq *ioapic_init(void)
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230 | 610626af | aliguori | { |
231 | 610626af | aliguori | IOAPICState *s; |
232 | 1632dc6a | Avi Kivity | qemu_irq *irq; |
233 | 610626af | aliguori | int io_memory;
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234 | 610626af | aliguori | |
235 | 610626af | aliguori | s = qemu_mallocz(sizeof(IOAPICState));
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236 | 610626af | aliguori | ioapic_reset(s); |
237 | 610626af | aliguori | |
238 | 1eed09cb | Avi Kivity | io_memory = cpu_register_io_memory(ioapic_mem_read, |
239 | 610626af | aliguori | ioapic_mem_write, s); |
240 | 610626af | aliguori | cpu_register_physical_memory(0xfec00000, 0x1000, io_memory); |
241 | 610626af | aliguori | |
242 | 3e9e9888 | Juan Quintela | vmstate_register(0, &vmstate_ioapic, s);
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243 | a08d4367 | Jan Kiszka | qemu_register_reset(ioapic_reset, s); |
244 | 1632dc6a | Avi Kivity | irq = qemu_allocate_irqs(ioapic_set_irq, s, IOAPIC_NUM_PINS); |
245 | 610626af | aliguori | |
246 | 1632dc6a | Avi Kivity | return irq;
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247 | 610626af | aliguori | } |