1 |
/* |
2 |
* Copyright (C) 2005-2006 Anders Gavare. All rights reserved. |
3 |
* |
4 |
* Redistribution and use in source and binary forms, with or without |
5 |
* modification, are permitted provided that the following conditions are met: |
6 |
* |
7 |
* 1. Redistributions of source code must retain the above copyright |
8 |
* notice, this list of conditions and the following disclaimer. |
9 |
* 2. Redistributions in binary form must reproduce the above copyright |
10 |
* notice, this list of conditions and the following disclaimer in the |
11 |
* documentation and/or other materials provided with the distribution. |
12 |
* 3. The name of the author may not be used to endorse or promote products |
13 |
* derived from this software without specific prior written permission. |
14 |
* |
15 |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
16 |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
17 |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
18 |
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
19 |
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
20 |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
21 |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
22 |
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
23 |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
24 |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
25 |
* SUCH DAMAGE. |
26 |
* |
27 |
* |
28 |
* $Id: dev_8259.c,v 1.25 2006/07/21 16:55:41 debug Exp $ |
29 |
* |
30 |
* 8259 Programmable Interrupt Controller. |
31 |
* |
32 |
* See the following URL for more details: |
33 |
* http://www.nondot.org/sabre/os/files/MiscHW/8259pic.txt |
34 |
*/ |
35 |
|
36 |
#include <stdio.h> |
37 |
#include <stdlib.h> |
38 |
#include <string.h> |
39 |
|
40 |
#include "cpu.h" |
41 |
#include "device.h" |
42 |
#include "devices.h" |
43 |
#include "emul.h" |
44 |
#include "machine.h" |
45 |
#include "memory.h" |
46 |
#include "misc.h" |
47 |
|
48 |
|
49 |
#define DEV_8259_LENGTH 2 |
50 |
|
51 |
/* #define DEV_8259_DEBUG */ |
52 |
|
53 |
|
54 |
DEVICE_ACCESS(8259) |
55 |
{ |
56 |
struct pic8259_data *d = (struct pic8259_data *) extra; |
57 |
uint64_t idata = 0, odata = 0; |
58 |
int i; |
59 |
|
60 |
if (writeflag == MEM_WRITE) |
61 |
idata = memory_readmax64(cpu, data, len); |
62 |
|
63 |
#ifdef DEV_8259_DEBUG |
64 |
if (writeflag == MEM_READ) |
65 |
fatal("[ 8259: read from 0x%x ]\n", (int)relative_addr); |
66 |
else |
67 |
fatal("[ 8259: write to 0x%x: 0x%x ]\n", |
68 |
(int)relative_addr, (int)idata); |
69 |
#endif |
70 |
|
71 |
switch (relative_addr) { |
72 |
case 0x00: |
73 |
if (writeflag == MEM_WRITE) { |
74 |
if ((idata & 0x10) == 0x10) { |
75 |
/* Bit 3: 0=edge, 1=level */ |
76 |
if (idata & 0x08) |
77 |
fatal("[ 8259: TODO: Level " |
78 |
"triggered (MCA bus) ]\n"); |
79 |
if (idata & 0x04) |
80 |
fatal("[ 8259: WARNING: Bit 2 set ]\n"); |
81 |
/* Bit 1: 0=cascade, 1=single */ |
82 |
/* Bit 0: 1=4th init byte */ |
83 |
/* This happens on non-x86 systems: |
84 |
if (!(idata & 0x01)) |
85 |
fatal("[ 8259: WARNING: Bit 0 NOT set!" |
86 |
"!! ]\n"); */ |
87 |
d->init_state = 1; |
88 |
break; |
89 |
} |
90 |
|
91 |
/* TODO: Is it ok to abort init state when there |
92 |
is a non-init command? */ |
93 |
if (d->init_state) |
94 |
fatal("[ 8259: WARNING: Was in init-state, but" |
95 |
" it was aborted? ]\n"); |
96 |
d->init_state = 0; |
97 |
|
98 |
if (idata == 0x0a) { |
99 |
d->current_command = 0x0a; |
100 |
} else if (idata == 0x0b) { |
101 |
d->current_command = 0x0b; |
102 |
} else if (idata == 0x0c) { |
103 |
/* Put Master in Buffered Mode */ |
104 |
d->current_command = 0x0c; |
105 |
} else if (idata == 0x20) { |
106 |
int old_irr = d->irr; |
107 |
/* End Of Interrupt */ |
108 |
/* TODO: in buffered mode, is this an EOI 0? */ |
109 |
d->irr &= ~d->isr; |
110 |
d->isr = 0; |
111 |
/* Recalculate interrupt assertions, |
112 |
if necessary: */ |
113 |
if ((old_irr & ~d->ier) != (d->irr & ~d->ier)) |
114 |
cpu_interrupt(cpu, d->irq_nr); |
115 |
} else if ((idata >= 0x21 && idata <= 0x27) || |
116 |
(idata >= 0x60 && idata <= 0x67) || |
117 |
(idata >= 0xe0 && idata <= 0xe7)) { |
118 |
/* Specific EOI */ |
119 |
int old_irr = d->irr; |
120 |
d->irr &= ~(1 << (idata & 7)); |
121 |
d->isr &= ~(1 << (idata & 7)); |
122 |
/* Recalc. int assertions, if necessary: */ |
123 |
if ((old_irr & ~d->ier) != (d->irr & ~d->ier)) |
124 |
cpu_interrupt(cpu, d->irq_nr); |
125 |
} else if (idata == 0x68) { |
126 |
/* Set Special Mask Mode */ |
127 |
/* TODO */ |
128 |
} else if (idata >= 0xc0 && idata <= 0xc7) { |
129 |
/* Set IRQ Priority Order */ |
130 |
/* TODO */ |
131 |
} else { |
132 |
fatal("[ 8259: unimplemented command 0x%02x" |
133 |
" ]\n", (int)idata); |
134 |
cpu->running = 0; |
135 |
} |
136 |
} else { |
137 |
switch (d->current_command) { |
138 |
case 0x0a: |
139 |
odata = d->irr; |
140 |
break; |
141 |
case 0x0b: |
142 |
odata = d->isr; |
143 |
break; |
144 |
case 0x0c: |
145 |
/* Buffered mode. */ |
146 |
odata = 0x00; |
147 |
for (i=0; i<8; i++) |
148 |
if ((d->irr >> i) & 1) { |
149 |
odata = 0x80 | i; |
150 |
break; |
151 |
} |
152 |
break; |
153 |
default: |
154 |
odata = 0x00; |
155 |
for (i=0; i<8; i++) |
156 |
if ((d->irr >> i) & 1) { |
157 |
odata = 0x80 | i; |
158 |
break; |
159 |
} |
160 |
break; |
161 |
/* |
162 |
* TODO: The "default" label should really do |
163 |
* something like this: |
164 |
* |
165 |
* fatal("[ 8259: unimplemented command 0x%02x" |
166 |
* " while reading ]\n", d->current_command); |
167 |
* cpu->running = 0; |
168 |
* |
169 |
* but Linux seems to read from the secondary PIC |
170 |
* in a manner which works better the way things |
171 |
* are coded right now. |
172 |
*/ |
173 |
} |
174 |
} |
175 |
break; |
176 |
case 0x01: |
177 |
if (d->init_state > 0) { |
178 |
if (d->init_state == 1) { |
179 |
d->irq_base = idata & 0xf8; |
180 |
/* This happens on non-x86 machines: |
181 |
if (idata & 7) |
182 |
fatal("[ 8259: WARNING! Lowest" |
183 |
" bits in Init Cmd 1 are" |
184 |
" non-zero! ]\n"); */ |
185 |
d->init_state = 2; |
186 |
} else if (d->init_state == 2) { |
187 |
/* Slave attachment. TODO */ |
188 |
d->init_state = 3; |
189 |
} else if (d->init_state == 3) { |
190 |
if (idata & 0x02) { |
191 |
/* Should not be set in PCs, but |
192 |
on CATS, for example, it is set. */ |
193 |
debug("[ 8259: WARNING! Bit 1 i" |
194 |
"n Init Cmd 4 is set! ]\n"); |
195 |
} |
196 |
if (!(idata & 0x01)) |
197 |
fatal("[ 8259: WARNING! Bit 0 " |
198 |
"in Init Cmd 4 is not" |
199 |
" set! ]\n"); |
200 |
d->init_state = 0; |
201 |
} |
202 |
break; |
203 |
} |
204 |
|
205 |
if (writeflag == MEM_WRITE) { |
206 |
int old_ier = d->ier; |
207 |
d->ier = idata; |
208 |
|
209 |
/* Recalculate interrupt assertions, |
210 |
if necessary: */ |
211 |
if ((d->irr & ~old_ier) != (d->irr & ~d->ier)) |
212 |
cpu_interrupt(cpu, d->irq_nr); |
213 |
} else { |
214 |
odata = d->ier; |
215 |
} |
216 |
break; |
217 |
default: |
218 |
if (writeflag == MEM_WRITE) { |
219 |
fatal("[ 8259: unimplemented write to address 0x%x" |
220 |
" data=0x%02x ]\n", (int)relative_addr, (int)idata); |
221 |
cpu->running = 0; |
222 |
} else { |
223 |
fatal("[ 8259: unimplemented read from address 0x%x " |
224 |
"]\n", (int)relative_addr); |
225 |
cpu->running = 0; |
226 |
} |
227 |
} |
228 |
|
229 |
if (writeflag == MEM_READ) |
230 |
memory_writemax64(cpu, data, len, odata); |
231 |
|
232 |
return 1; |
233 |
} |
234 |
|
235 |
|
236 |
/* |
237 |
* devinit_8259(): |
238 |
* |
239 |
* Initialize an 8259 PIC. Important notes: |
240 |
* |
241 |
* x) Most systems use _TWO_ 8259 PICs. These should be registered |
242 |
* as separate devices. |
243 |
* |
244 |
* x) The irq number specified is the number used to re-calculate |
245 |
* CPU interrupt assertions. It is _not_ the irq number at |
246 |
* which the PIC is connected. (That is left to machine specific |
247 |
* code in src/machine.c.) |
248 |
*/ |
249 |
DEVINIT(8259) |
250 |
{ |
251 |
struct pic8259_data *d = malloc(sizeof(struct pic8259_data)); |
252 |
char *name2; |
253 |
size_t nlen = strlen(devinit->name) + 20; |
254 |
|
255 |
if (d == NULL) { |
256 |
fprintf(stderr, "out of memory\n"); |
257 |
exit(1); |
258 |
} |
259 |
memset(d, 0, sizeof(struct pic8259_data)); |
260 |
d->irq_nr = devinit->irq_nr; |
261 |
|
262 |
name2 = malloc(nlen); |
263 |
snprintf(name2, nlen, "%s", devinit->name); |
264 |
if ((devinit->addr & 0xfff) == 0xa0) { |
265 |
strlcat(name2, " [secondary]", nlen); |
266 |
d->irq_base = 8; |
267 |
} |
268 |
|
269 |
memory_device_register(devinit->machine->memory, name2, |
270 |
devinit->addr, DEV_8259_LENGTH, dev_8259_access, d, |
271 |
DM_DEFAULT, NULL); |
272 |
|
273 |
devinit->return_ptr = d; |
274 |
return 1; |
275 |
} |
276 |
|