/[gxemul]/trunk/src/devices/dev_8250.c
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Contents of /trunk/src/devices/dev_8250.c

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Revision 28 - (show annotations)
Mon Oct 8 16:20:26 2007 UTC (13 years, 1 month ago) by dpavlin
File MIME type: text/plain
File size: 4812 byte(s)
++ trunk/HISTORY	(local)
$Id: HISTORY,v 1.1298 2006/07/22 11:27:46 debug Exp $
20060626	Continuing on SPARC emulation (beginning on the 'save'
		instruction, register windows, etc).
20060629	Planning statistics gathering (new -s command line option),
		and renaming speed_tricks to allow_instruction_combinations.
20060630	Some minor manual page updates.
		Various cleanups.
		Implementing the -s command line option.
20060701	FINALLY found the bug which prevented Linux and Ultrix from
		running without the ugly hack in the R2000/R3000 cache isol
		code; it was the phystranslation hint array which was buggy.
		Removing the phystranslation hint code completely, for now.
20060702	Minor dyntrans cleanups; invalidation of physpages now only
		invalidate those parts of a page that have actually been
		translated. (32 parts per page.)
		Some MIPS non-R3000 speed fixes.
		Experimenting with MIPS instruction combination for some
		addiu+bne+sw loops, and sw+sw+sw.
		Adding support (again) for larger-than-4KB pages in MIPS tlbw*.
		Continuing on SPARC emulation: adding load/store instructions.
20060704	Fixing a virtual vs physical page shift bug in the new tlbw*
		implementation. Problem noticed by Jakub Jermar. (Many thanks.)
		Moving rfe and eret to cpu_mips_instr.c, since that is the
		only place that uses them nowadays.
20060705	Removing the BSD license from the "testmachine" include files,
		placing them in the public domain instead; this enables the
		testmachine stuff to be used from projects which are
		incompatible with the BSD license for some reason.
20060707	Adding instruction combinations for the R2000/R3000 L1
		I-cache invalidation code used by NetBSD/pmax 3.0, lui+addiu,
		various branches followed by addiu or nop, and jr ra followed
		by addiu. The time it takes to perform a full NetBSD/pmax R3000
		install on the laptop has dropped from 573 seconds to 539. :-)
20060708	Adding a framebuffer controller device (dev_fbctrl), which so
		far can be used to change the fb resolution during runtime, but
		in the future will also be useful for accelerated block fill/
		copy, and possibly also simplified character output.
		Adding an instruction combination for NetBSD/pmax' strlen.
20060709	Minor fixes: reading raw files in src/file.c wasn't memblock
		aligned, removing buggy multi_sw MIPS instruction combination,
		etc.
20060711	Adding a machine_qemu.c, which contains a "qemu_mips" machine.
		(It mimics QEMU's MIPS machine mode, so that a test kernel
		made for QEMU_MIPS also can run in GXemul... at least to some
		extent.)  Adding a short section about how to run this mode to
		doc/guestoses.html.
20060714	Misc. minor code cleanups.
20060715	Applying a patch which adds getchar() to promemul/yamon.c
		(from Oleksandr Tymoshenko).
		Adding yamon.h from NetBSD, and rewriting yamon.c to use it
		(instead of ugly hardcoded numbers) + some cleanup.
20060716	Found and fixed the bug which broke single-stepping of 64-bit
		programs between 0.4.0 and 0.4.0.1 (caused by too quick
		refactoring and no testing). Hopefully this fix will not
		break too many other things.
20060718	Continuing on the 8253 PIT; it now works with Linux/QEMU_MIPS.
		Re-adding the sw+sw+sw instr comb (the problem was that I had
		ignored endian issues); however, it doesn't seem to give any
		big performance gain.
20060720	Adding a dummy Transputer mode (T414, T800 etc) skeleton (only
		the 'j' and 'ldc' instructions are implemented so far). :-}
20060721	Adding gtreg.h from NetBSD, updating dev_gt.c to use it, plus
		misc. other updates to get Linux 2.6 for evbmips/malta working
		(thanks to Alec Voropay for the details).
		FINALLY found and fixed the bug which made tlbw* for non-R3000
		buggy; it was a reference count problem in the dyntrans core.
20060722	Testing stuff; things seem stable enough for a new release.

==============  RELEASE 0.4.1  ==============


1 /*
2 * Copyright (C) 2004-2006 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_8250.c,v 1.24 2006/07/21 16:55:41 debug Exp $
29 *
30 * 8250 serial controller.
31 *
32 * TODO: Actually implement this device. So far it's just a fake device
33 * to allow Linux to print stuff to the console.
34 */
35
36 #include <stdio.h>
37 #include <stdlib.h>
38 #include <string.h>
39
40 #include "console.h"
41 #include "device.h"
42 #include "machine.h"
43 #include "memory.h"
44 #include "misc.h"
45
46
47 struct dev_8250_data {
48 int console_handle;
49 char *name;
50
51 int irq_enable;
52 int irqnr;
53 int in_use;
54 int addrmult;
55
56 int reg[8];
57
58 int dlab; /* Divisor Latch Access bit */
59 int divisor;
60 int databits;
61 char parity;
62 const char *stopbits;
63 };
64
65 #define DEV_8250_LENGTH 8
66 #define DEV_8250_TICKSHIFT 15
67
68
69 DEVICE_TICK(8250)
70 {
71 #if 0
72 /* This stuff works for 16550. TODO for 8250 */
73
74 struct dev_8250_data *d = extra;
75
76 d->reg[REG_IID] |= IIR_NOPEND;
77 cpu_interrupt_ack(cpu, d->irqnr);
78
79 if (console_charavail(d->console_handle))
80 d->reg[REG_IID] |= IIR_RXRDY;
81 else
82 d->reg[REG_IID] &= ~IIR_RXRDY;
83
84 if (d->reg[REG_MCR] & MCR_IENABLE) {
85 if (d->irq_enable & IER_ETXRDY && d->reg[REG_IID] & IIR_TXRDY) {
86 cpu_interrupt(cpu, d->irqnr);
87 d->reg[REG_IID] &= ~IIR_NOPEND;
88 }
89
90 if (d->irq_enable & IER_ERXRDY && d->reg[REG_IID] & IIR_RXRDY) {
91 cpu_interrupt(cpu, d->irqnr);
92 d->reg[REG_IID] &= ~IIR_NOPEND;
93 }
94 }
95 #endif
96 }
97
98
99 DEVICE_ACCESS(8250)
100 {
101 uint64_t idata = 0, odata = 0;
102 struct dev_8250_data *d = extra;
103
104 if (writeflag == MEM_WRITE)
105 idata = memory_readmax64(cpu, data, len);
106
107 relative_addr /= d->addrmult;
108
109 if (writeflag == MEM_WRITE && relative_addr == 0) {
110 console_putchar(d->console_handle, idata);
111 } else if (writeflag == MEM_READ && relative_addr == 5) {
112 odata = 64 + 32;
113 } else {
114 #if 0
115 if (writeflag == MEM_WRITE)
116 fatal("[ 8250: write addr=0x%02x idata = 0x%02x ]\n",
117 (int)relative_addr, (int)idata);
118 else
119 fatal("[ 8250: read addr=0x%02x ]\n", relative_addr);
120 #endif
121 }
122
123 if (writeflag == MEM_READ)
124 memory_writemax64(cpu, data, len, odata);
125
126 return 1;
127 }
128
129
130 DEVINIT(8250)
131 {
132 size_t nlen;
133 char *name;
134 struct dev_8250_data *d;
135
136 d = malloc(sizeof(struct dev_8250_data));
137 if (d == NULL) {
138 fprintf(stderr, "out of memory\n");
139 exit(1);
140 }
141 memset(d, 0, sizeof(struct dev_8250_data));
142 d->irqnr = devinit->irq_nr;
143 d->addrmult = devinit->addr_mult;
144 d->in_use = devinit->in_use;
145 d->dlab = 0;
146 d->divisor = 115200 / 9600;
147 d->databits = 8;
148 d->parity = 'N';
149 d->stopbits = "1";
150 d->name = devinit->name2 != NULL? devinit->name2 : "";
151 d->console_handle =
152 console_start_slave(devinit->machine, devinit->name2 != NULL?
153 devinit->name2 : devinit->name, d->in_use);
154
155 nlen = strlen(devinit->name) + 10;
156 if (devinit->name2 != NULL)
157 nlen += strlen(devinit->name2);
158 name = malloc(nlen);
159 if (name == NULL) {
160 fprintf(stderr, "out of memory\n");
161 exit(1);
162 }
163 if (devinit->name2 != NULL && devinit->name2[0])
164 snprintf(name, nlen, "%s [%s]", devinit->name, devinit->name2);
165 else
166 snprintf(name, nlen, "%s", devinit->name);
167
168 memory_device_register(devinit->machine->memory, name,
169 devinit->addr, DEV_8250_LENGTH * devinit->addr_mult,
170 dev_8250_access, d, DM_DEFAULT, NULL);
171 machine_add_tickfunction(devinit->machine, dev_8250_tick, d,
172 DEV_8250_TICKSHIFT, 0.0);
173
174 return 1;
175 }
176

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