/[gxemul]/trunk/src/devices/dev_8250.c
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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Annotation of /trunk/src/devices/dev_8250.c

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Revision 28 - (hide annotations)
Mon Oct 8 16:20:26 2007 UTC (16 years, 6 months 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 dpavlin 4 /*
2 dpavlin 22 * Copyright (C) 2004-2006 Anders Gavare. All rights reserved.
3 dpavlin 4 *
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 dpavlin 28 * $Id: dev_8250.c,v 1.24 2006/07/21 16:55:41 debug Exp $
29 dpavlin 4 *
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 dpavlin 22 int console_handle;
49     char *name;
50 dpavlin 4
51     int irq_enable;
52     int irqnr;
53 dpavlin 22 int in_use;
54 dpavlin 4 int addrmult;
55    
56 dpavlin 22 int reg[8];
57    
58 dpavlin 4 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 dpavlin 22 #define DEV_8250_TICKSHIFT 15
67 dpavlin 4
68    
69 dpavlin 28 DEVICE_TICK(8250)
70 dpavlin 4 {
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 dpavlin 22 DEVICE_ACCESS(8250)
100 dpavlin 4 {
101     uint64_t idata = 0, odata = 0;
102     struct dev_8250_data *d = extra;
103    
104 dpavlin 18 if (writeflag == MEM_WRITE)
105     idata = memory_readmax64(cpu, data, len);
106    
107 dpavlin 4 relative_addr /= d->addrmult;
108    
109 dpavlin 22 if (writeflag == MEM_WRITE && relative_addr == 0) {
110 dpavlin 4 console_putchar(d->console_handle, idata);
111 dpavlin 22 } else if (writeflag == MEM_READ && relative_addr == 5) {
112 dpavlin 4 odata = 64 + 32;
113 dpavlin 22 } else {
114 dpavlin 4 #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 dpavlin 22 DEVINIT(8250)
131 dpavlin 4 {
132 dpavlin 22 size_t nlen;
133     char *name;
134 dpavlin 4 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 dpavlin 22 d->irqnr = devinit->irq_nr;
143 dpavlin 4 d->addrmult = devinit->addr_mult;
144 dpavlin 22 d->in_use = devinit->in_use;
145     d->dlab = 0;
146 dpavlin 4 d->divisor = 115200 / 9600;
147     d->databits = 8;
148     d->parity = 'N';
149     d->stopbits = "1";
150 dpavlin 22 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 dpavlin 4
155 dpavlin 22 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 dpavlin 4 devinit->addr, DEV_8250_LENGTH * devinit->addr_mult,
170 dpavlin 20 dev_8250_access, d, DM_DEFAULT, NULL);
171 dpavlin 22 machine_add_tickfunction(devinit->machine, dev_8250_tick, d,
172 dpavlin 24 DEV_8250_TICKSHIFT, 0.0);
173 dpavlin 4
174     return 1;
175     }
176    
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