root / hw / i8254_common.c @ 37952117
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1 | d11e859e | Jan Kiszka | /*
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2 | d11e859e | Jan Kiszka | * QEMU 8253/8254 - common bits of emulated and KVM kernel model
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3 | d11e859e | Jan Kiszka | *
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4 | d11e859e | Jan Kiszka | * Copyright (c) 2003-2004 Fabrice Bellard
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5 | d11e859e | Jan Kiszka | * Copyright (c) 2012 Jan Kiszka, Siemens AG
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6 | d11e859e | Jan Kiszka | *
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7 | d11e859e | Jan Kiszka | * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 | d11e859e | Jan Kiszka | * of this software and associated documentation files (the "Software"), to deal
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9 | d11e859e | Jan Kiszka | * in the Software without restriction, including without limitation the rights
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10 | d11e859e | Jan Kiszka | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 | d11e859e | Jan Kiszka | * copies of the Software, and to permit persons to whom the Software is
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12 | d11e859e | Jan Kiszka | * furnished to do so, subject to the following conditions:
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13 | d11e859e | Jan Kiszka | *
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14 | d11e859e | Jan Kiszka | * The above copyright notice and this permission notice shall be included in
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15 | d11e859e | Jan Kiszka | * all copies or substantial portions of the Software.
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16 | d11e859e | Jan Kiszka | *
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17 | d11e859e | Jan Kiszka | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 | d11e859e | Jan Kiszka | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 | d11e859e | Jan Kiszka | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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20 | d11e859e | Jan Kiszka | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 | d11e859e | Jan Kiszka | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 | d11e859e | Jan Kiszka | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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23 | d11e859e | Jan Kiszka | * THE SOFTWARE.
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24 | d11e859e | Jan Kiszka | */
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25 | d11e859e | Jan Kiszka | #include "hw.h" |
26 | d11e859e | Jan Kiszka | #include "pc.h" |
27 | d11e859e | Jan Kiszka | #include "isa.h" |
28 | d11e859e | Jan Kiszka | #include "qemu-timer.h" |
29 | d11e859e | Jan Kiszka | #include "i8254.h" |
30 | d11e859e | Jan Kiszka | #include "i8254_internal.h" |
31 | d11e859e | Jan Kiszka | |
32 | d11e859e | Jan Kiszka | /* val must be 0 or 1 */
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33 | d11e859e | Jan Kiszka | void pit_set_gate(ISADevice *dev, int channel, int val) |
34 | d11e859e | Jan Kiszka | { |
35 | d11e859e | Jan Kiszka | PITCommonState *pit = PIT_COMMON(dev); |
36 | d11e859e | Jan Kiszka | PITChannelState *s = &pit->channels[channel]; |
37 | d11e859e | Jan Kiszka | PITCommonClass *c = PIT_COMMON_GET_CLASS(pit); |
38 | d11e859e | Jan Kiszka | |
39 | d11e859e | Jan Kiszka | c->set_channel_gate(pit, s, val); |
40 | d11e859e | Jan Kiszka | } |
41 | d11e859e | Jan Kiszka | |
42 | d11e859e | Jan Kiszka | /* get pit output bit */
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43 | d11e859e | Jan Kiszka | int pit_get_out(PITChannelState *s, int64_t current_time)
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44 | d11e859e | Jan Kiszka | { |
45 | d11e859e | Jan Kiszka | uint64_t d; |
46 | d11e859e | Jan Kiszka | int out;
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47 | d11e859e | Jan Kiszka | |
48 | d11e859e | Jan Kiszka | d = muldiv64(current_time - s->count_load_time, PIT_FREQ, |
49 | d11e859e | Jan Kiszka | get_ticks_per_sec()); |
50 | d11e859e | Jan Kiszka | switch (s->mode) {
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51 | d11e859e | Jan Kiszka | default:
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52 | d11e859e | Jan Kiszka | case 0: |
53 | d11e859e | Jan Kiszka | out = (d >= s->count); |
54 | d11e859e | Jan Kiszka | break;
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55 | d11e859e | Jan Kiszka | case 1: |
56 | d11e859e | Jan Kiszka | out = (d < s->count); |
57 | d11e859e | Jan Kiszka | break;
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58 | d11e859e | Jan Kiszka | case 2: |
59 | d11e859e | Jan Kiszka | if ((d % s->count) == 0 && d != 0) { |
60 | d11e859e | Jan Kiszka | out = 1;
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61 | d11e859e | Jan Kiszka | } else {
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62 | d11e859e | Jan Kiszka | out = 0;
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63 | d11e859e | Jan Kiszka | } |
64 | d11e859e | Jan Kiszka | break;
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65 | d11e859e | Jan Kiszka | case 3: |
66 | d11e859e | Jan Kiszka | out = (d % s->count) < ((s->count + 1) >> 1); |
67 | d11e859e | Jan Kiszka | break;
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68 | d11e859e | Jan Kiszka | case 4: |
69 | d11e859e | Jan Kiszka | case 5: |
70 | d11e859e | Jan Kiszka | out = (d == s->count); |
71 | d11e859e | Jan Kiszka | break;
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72 | d11e859e | Jan Kiszka | } |
73 | d11e859e | Jan Kiszka | return out;
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74 | d11e859e | Jan Kiszka | } |
75 | d11e859e | Jan Kiszka | |
76 | d11e859e | Jan Kiszka | /* return -1 if no transition will occur. */
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77 | d11e859e | Jan Kiszka | int64_t pit_get_next_transition_time(PITChannelState *s, int64_t current_time) |
78 | d11e859e | Jan Kiszka | { |
79 | d11e859e | Jan Kiszka | uint64_t d, next_time, base; |
80 | d11e859e | Jan Kiszka | int period2;
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81 | d11e859e | Jan Kiszka | |
82 | d11e859e | Jan Kiszka | d = muldiv64(current_time - s->count_load_time, PIT_FREQ, |
83 | d11e859e | Jan Kiszka | get_ticks_per_sec()); |
84 | d11e859e | Jan Kiszka | switch (s->mode) {
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85 | d11e859e | Jan Kiszka | default:
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86 | d11e859e | Jan Kiszka | case 0: |
87 | d11e859e | Jan Kiszka | case 1: |
88 | d11e859e | Jan Kiszka | if (d < s->count) {
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89 | d11e859e | Jan Kiszka | next_time = s->count; |
90 | d11e859e | Jan Kiszka | } else {
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91 | d11e859e | Jan Kiszka | return -1; |
92 | d11e859e | Jan Kiszka | } |
93 | d11e859e | Jan Kiszka | break;
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94 | d11e859e | Jan Kiszka | case 2: |
95 | d11e859e | Jan Kiszka | base = (d / s->count) * s->count; |
96 | d11e859e | Jan Kiszka | if ((d - base) == 0 && d != 0) { |
97 | d11e859e | Jan Kiszka | next_time = base + s->count; |
98 | d11e859e | Jan Kiszka | } else {
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99 | d11e859e | Jan Kiszka | next_time = base + s->count + 1;
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100 | d11e859e | Jan Kiszka | } |
101 | d11e859e | Jan Kiszka | break;
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102 | d11e859e | Jan Kiszka | case 3: |
103 | d11e859e | Jan Kiszka | base = (d / s->count) * s->count; |
104 | d11e859e | Jan Kiszka | period2 = ((s->count + 1) >> 1); |
105 | d11e859e | Jan Kiszka | if ((d - base) < period2) {
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106 | d11e859e | Jan Kiszka | next_time = base + period2; |
107 | d11e859e | Jan Kiszka | } else {
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108 | d11e859e | Jan Kiszka | next_time = base + s->count; |
109 | d11e859e | Jan Kiszka | } |
110 | d11e859e | Jan Kiszka | break;
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111 | d11e859e | Jan Kiszka | case 4: |
112 | d11e859e | Jan Kiszka | case 5: |
113 | d11e859e | Jan Kiszka | if (d < s->count) {
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114 | d11e859e | Jan Kiszka | next_time = s->count; |
115 | d11e859e | Jan Kiszka | } else if (d == s->count) { |
116 | d11e859e | Jan Kiszka | next_time = s->count + 1;
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117 | d11e859e | Jan Kiszka | } else {
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118 | d11e859e | Jan Kiszka | return -1; |
119 | d11e859e | Jan Kiszka | } |
120 | d11e859e | Jan Kiszka | break;
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121 | d11e859e | Jan Kiszka | } |
122 | d11e859e | Jan Kiszka | /* convert to timer units */
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123 | d11e859e | Jan Kiszka | next_time = s->count_load_time + muldiv64(next_time, get_ticks_per_sec(), |
124 | d11e859e | Jan Kiszka | PIT_FREQ); |
125 | d11e859e | Jan Kiszka | /* fix potential rounding problems */
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126 | d11e859e | Jan Kiszka | /* XXX: better solution: use a clock at PIT_FREQ Hz */
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127 | d11e859e | Jan Kiszka | if (next_time <= current_time) {
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128 | d11e859e | Jan Kiszka | next_time = current_time + 1;
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129 | d11e859e | Jan Kiszka | } |
130 | d11e859e | Jan Kiszka | return next_time;
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131 | d11e859e | Jan Kiszka | } |
132 | d11e859e | Jan Kiszka | |
133 | d11e859e | Jan Kiszka | void pit_get_channel_info_common(PITCommonState *s, PITChannelState *sc,
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134 | d11e859e | Jan Kiszka | PITChannelInfo *info) |
135 | d11e859e | Jan Kiszka | { |
136 | d11e859e | Jan Kiszka | info->gate = sc->gate; |
137 | d11e859e | Jan Kiszka | info->mode = sc->mode; |
138 | d11e859e | Jan Kiszka | info->initial_count = sc->count; |
139 | d11e859e | Jan Kiszka | info->out = pit_get_out(sc, qemu_get_clock_ns(vm_clock)); |
140 | d11e859e | Jan Kiszka | } |
141 | d11e859e | Jan Kiszka | |
142 | d11e859e | Jan Kiszka | void pit_get_channel_info(ISADevice *dev, int channel, PITChannelInfo *info) |
143 | d11e859e | Jan Kiszka | { |
144 | d11e859e | Jan Kiszka | PITCommonState *pit = PIT_COMMON(dev); |
145 | d11e859e | Jan Kiszka | PITChannelState *s = &pit->channels[channel]; |
146 | d11e859e | Jan Kiszka | PITCommonClass *c = PIT_COMMON_GET_CLASS(pit); |
147 | d11e859e | Jan Kiszka | |
148 | d11e859e | Jan Kiszka | c->get_channel_info(pit, s, info); |
149 | d11e859e | Jan Kiszka | } |
150 | d11e859e | Jan Kiszka | |
151 | d11e859e | Jan Kiszka | void pit_reset_common(PITCommonState *pit)
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152 | d11e859e | Jan Kiszka | { |
153 | d11e859e | Jan Kiszka | PITChannelState *s; |
154 | d11e859e | Jan Kiszka | int i;
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155 | d11e859e | Jan Kiszka | |
156 | d11e859e | Jan Kiszka | for (i = 0; i < 3; i++) { |
157 | d11e859e | Jan Kiszka | s = &pit->channels[i]; |
158 | d11e859e | Jan Kiszka | s->mode = 3;
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159 | d11e859e | Jan Kiszka | s->gate = (i != 2);
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160 | d11e859e | Jan Kiszka | s->count_load_time = qemu_get_clock_ns(vm_clock); |
161 | d11e859e | Jan Kiszka | s->count = 0x10000;
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162 | d11e859e | Jan Kiszka | if (i == 0 && !s->irq_disabled) { |
163 | d11e859e | Jan Kiszka | s->next_transition_time = |
164 | d11e859e | Jan Kiszka | pit_get_next_transition_time(s, s->count_load_time); |
165 | d11e859e | Jan Kiszka | } |
166 | d11e859e | Jan Kiszka | } |
167 | d11e859e | Jan Kiszka | } |
168 | d11e859e | Jan Kiszka | |
169 | d11e859e | Jan Kiszka | static int pit_init_common(ISADevice *dev) |
170 | d11e859e | Jan Kiszka | { |
171 | d11e859e | Jan Kiszka | PITCommonState *pit = PIT_COMMON(dev); |
172 | d11e859e | Jan Kiszka | PITCommonClass *c = PIT_COMMON_GET_CLASS(pit); |
173 | d11e859e | Jan Kiszka | int ret;
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174 | d11e859e | Jan Kiszka | |
175 | d11e859e | Jan Kiszka | ret = c->init(pit); |
176 | d11e859e | Jan Kiszka | if (ret < 0) { |
177 | d11e859e | Jan Kiszka | return ret;
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178 | d11e859e | Jan Kiszka | } |
179 | d11e859e | Jan Kiszka | |
180 | d11e859e | Jan Kiszka | isa_register_ioport(dev, &pit->ioports, pit->iobase); |
181 | d11e859e | Jan Kiszka | |
182 | d11e859e | Jan Kiszka | qdev_set_legacy_instance_id(&dev->qdev, pit->iobase, 2);
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183 | d11e859e | Jan Kiszka | |
184 | d11e859e | Jan Kiszka | return 0; |
185 | d11e859e | Jan Kiszka | } |
186 | d11e859e | Jan Kiszka | |
187 | d11e859e | Jan Kiszka | static const VMStateDescription vmstate_pit_channel = { |
188 | d11e859e | Jan Kiszka | .name = "pit channel",
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189 | d11e859e | Jan Kiszka | .version_id = 2,
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190 | d11e859e | Jan Kiszka | .minimum_version_id = 2,
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191 | d11e859e | Jan Kiszka | .minimum_version_id_old = 2,
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192 | d11e859e | Jan Kiszka | .fields = (VMStateField[]) { |
193 | d11e859e | Jan Kiszka | VMSTATE_INT32(count, PITChannelState), |
194 | d11e859e | Jan Kiszka | VMSTATE_UINT16(latched_count, PITChannelState), |
195 | d11e859e | Jan Kiszka | VMSTATE_UINT8(count_latched, PITChannelState), |
196 | d11e859e | Jan Kiszka | VMSTATE_UINT8(status_latched, PITChannelState), |
197 | d11e859e | Jan Kiszka | VMSTATE_UINT8(status, PITChannelState), |
198 | d11e859e | Jan Kiszka | VMSTATE_UINT8(read_state, PITChannelState), |
199 | d11e859e | Jan Kiszka | VMSTATE_UINT8(write_state, PITChannelState), |
200 | d11e859e | Jan Kiszka | VMSTATE_UINT8(write_latch, PITChannelState), |
201 | d11e859e | Jan Kiszka | VMSTATE_UINT8(rw_mode, PITChannelState), |
202 | d11e859e | Jan Kiszka | VMSTATE_UINT8(mode, PITChannelState), |
203 | d11e859e | Jan Kiszka | VMSTATE_UINT8(bcd, PITChannelState), |
204 | d11e859e | Jan Kiszka | VMSTATE_UINT8(gate, PITChannelState), |
205 | d11e859e | Jan Kiszka | VMSTATE_INT64(count_load_time, PITChannelState), |
206 | d11e859e | Jan Kiszka | VMSTATE_INT64(next_transition_time, PITChannelState), |
207 | d11e859e | Jan Kiszka | VMSTATE_END_OF_LIST() |
208 | d11e859e | Jan Kiszka | } |
209 | d11e859e | Jan Kiszka | }; |
210 | d11e859e | Jan Kiszka | |
211 | d11e859e | Jan Kiszka | static int pit_load_old(QEMUFile *f, void *opaque, int version_id) |
212 | d11e859e | Jan Kiszka | { |
213 | d11e859e | Jan Kiszka | PITCommonState *pit = opaque; |
214 | 3fbc1c0c | Jan Kiszka | PITCommonClass *c = PIT_COMMON_GET_CLASS(pit); |
215 | d11e859e | Jan Kiszka | PITChannelState *s; |
216 | d11e859e | Jan Kiszka | int i;
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217 | d11e859e | Jan Kiszka | |
218 | d11e859e | Jan Kiszka | if (version_id != 1) { |
219 | d11e859e | Jan Kiszka | return -EINVAL;
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220 | d11e859e | Jan Kiszka | } |
221 | d11e859e | Jan Kiszka | |
222 | d11e859e | Jan Kiszka | for (i = 0; i < 3; i++) { |
223 | d11e859e | Jan Kiszka | s = &pit->channels[i]; |
224 | d11e859e | Jan Kiszka | s->count = qemu_get_be32(f); |
225 | d11e859e | Jan Kiszka | qemu_get_be16s(f, &s->latched_count); |
226 | d11e859e | Jan Kiszka | qemu_get_8s(f, &s->count_latched); |
227 | d11e859e | Jan Kiszka | qemu_get_8s(f, &s->status_latched); |
228 | d11e859e | Jan Kiszka | qemu_get_8s(f, &s->status); |
229 | d11e859e | Jan Kiszka | qemu_get_8s(f, &s->read_state); |
230 | d11e859e | Jan Kiszka | qemu_get_8s(f, &s->write_state); |
231 | d11e859e | Jan Kiszka | qemu_get_8s(f, &s->write_latch); |
232 | d11e859e | Jan Kiszka | qemu_get_8s(f, &s->rw_mode); |
233 | d11e859e | Jan Kiszka | qemu_get_8s(f, &s->mode); |
234 | d11e859e | Jan Kiszka | qemu_get_8s(f, &s->bcd); |
235 | d11e859e | Jan Kiszka | qemu_get_8s(f, &s->gate); |
236 | d11e859e | Jan Kiszka | s->count_load_time = qemu_get_be64(f); |
237 | d11e859e | Jan Kiszka | s->irq_disabled = 0;
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238 | 3fbc1c0c | Jan Kiszka | if (i == 0) { |
239 | d11e859e | Jan Kiszka | s->next_transition_time = qemu_get_be64(f); |
240 | d11e859e | Jan Kiszka | } |
241 | d11e859e | Jan Kiszka | } |
242 | 3fbc1c0c | Jan Kiszka | if (c->post_load) {
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243 | 3fbc1c0c | Jan Kiszka | c->post_load(pit); |
244 | 3fbc1c0c | Jan Kiszka | } |
245 | d11e859e | Jan Kiszka | return 0; |
246 | d11e859e | Jan Kiszka | } |
247 | d11e859e | Jan Kiszka | |
248 | d11e859e | Jan Kiszka | static void pit_dispatch_pre_save(void *opaque) |
249 | d11e859e | Jan Kiszka | { |
250 | d11e859e | Jan Kiszka | PITCommonState *s = opaque; |
251 | d11e859e | Jan Kiszka | PITCommonClass *c = PIT_COMMON_GET_CLASS(s); |
252 | d11e859e | Jan Kiszka | |
253 | d11e859e | Jan Kiszka | if (c->pre_save) {
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254 | d11e859e | Jan Kiszka | c->pre_save(s); |
255 | d11e859e | Jan Kiszka | } |
256 | d11e859e | Jan Kiszka | } |
257 | d11e859e | Jan Kiszka | |
258 | d11e859e | Jan Kiszka | static int pit_dispatch_post_load(void *opaque, int version_id) |
259 | d11e859e | Jan Kiszka | { |
260 | d11e859e | Jan Kiszka | PITCommonState *s = opaque; |
261 | d11e859e | Jan Kiszka | PITCommonClass *c = PIT_COMMON_GET_CLASS(s); |
262 | d11e859e | Jan Kiszka | |
263 | d11e859e | Jan Kiszka | if (c->post_load) {
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264 | d11e859e | Jan Kiszka | c->post_load(s); |
265 | d11e859e | Jan Kiszka | } |
266 | d11e859e | Jan Kiszka | return 0; |
267 | d11e859e | Jan Kiszka | } |
268 | d11e859e | Jan Kiszka | |
269 | d11e859e | Jan Kiszka | static const VMStateDescription vmstate_pit_common = { |
270 | d11e859e | Jan Kiszka | .name = "i8254",
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271 | d11e859e | Jan Kiszka | .version_id = 3,
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272 | d11e859e | Jan Kiszka | .minimum_version_id = 2,
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273 | d11e859e | Jan Kiszka | .minimum_version_id_old = 1,
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274 | d11e859e | Jan Kiszka | .load_state_old = pit_load_old, |
275 | d11e859e | Jan Kiszka | .pre_save = pit_dispatch_pre_save, |
276 | d11e859e | Jan Kiszka | .post_load = pit_dispatch_post_load, |
277 | d11e859e | Jan Kiszka | .fields = (VMStateField[]) { |
278 | d11e859e | Jan Kiszka | VMSTATE_UINT32_V(channels[0].irq_disabled, PITCommonState, 3), |
279 | d11e859e | Jan Kiszka | VMSTATE_STRUCT_ARRAY(channels, PITCommonState, 3, 2, |
280 | d11e859e | Jan Kiszka | vmstate_pit_channel, PITChannelState), |
281 | 3fbc1c0c | Jan Kiszka | VMSTATE_INT64(channels[0].next_transition_time,
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282 | 3fbc1c0c | Jan Kiszka | PITCommonState), /* formerly irq_timer */
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283 | d11e859e | Jan Kiszka | VMSTATE_END_OF_LIST() |
284 | d11e859e | Jan Kiszka | } |
285 | d11e859e | Jan Kiszka | }; |
286 | d11e859e | Jan Kiszka | |
287 | d11e859e | Jan Kiszka | static void pit_common_class_init(ObjectClass *klass, void *data) |
288 | d11e859e | Jan Kiszka | { |
289 | d11e859e | Jan Kiszka | ISADeviceClass *ic = ISA_DEVICE_CLASS(klass); |
290 | d11e859e | Jan Kiszka | DeviceClass *dc = DEVICE_CLASS(klass); |
291 | d11e859e | Jan Kiszka | |
292 | d11e859e | Jan Kiszka | ic->init = pit_init_common; |
293 | d11e859e | Jan Kiszka | dc->vmsd = &vmstate_pit_common; |
294 | d11e859e | Jan Kiszka | dc->no_user = 1;
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295 | d11e859e | Jan Kiszka | } |
296 | d11e859e | Jan Kiszka | |
297 | d11e859e | Jan Kiszka | static TypeInfo pit_common_type = {
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298 | d11e859e | Jan Kiszka | .name = TYPE_PIT_COMMON, |
299 | d11e859e | Jan Kiszka | .parent = TYPE_ISA_DEVICE, |
300 | d11e859e | Jan Kiszka | .instance_size = sizeof(PITCommonState),
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301 | d11e859e | Jan Kiszka | .class_size = sizeof(PITCommonClass),
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302 | d11e859e | Jan Kiszka | .class_init = pit_common_class_init, |
303 | d11e859e | Jan Kiszka | .abstract = true,
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304 | d11e859e | Jan Kiszka | }; |
305 | d11e859e | Jan Kiszka | |
306 | d11e859e | Jan Kiszka | static void register_devices(void) |
307 | d11e859e | Jan Kiszka | { |
308 | d11e859e | Jan Kiszka | type_register_static(&pit_common_type); |
309 | d11e859e | Jan Kiszka | } |
310 | d11e859e | Jan Kiszka | |
311 | d11e859e | Jan Kiszka | type_init(register_devices); |