WebSVN – HelenOS – Diff – /tags/0.2.0.5/kernel/generic/src/console/console.c


/*
 * Copyright (c) 2003 Josef Cejka
 * Copyright (c) 2005 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/** @addtogroup genericconsole
 * @{
 */
/** @file
 */
 
#include <console/console.h>
#include <console/chardev.h>
#include <synch/waitq.h>
#include <synch/spinlock.h>
#include <arch/types.h>
#include <arch.h>
#include <func.h>
#include <print.h>
#include <atomic.h>
 
#define BUFLEN 2048
static char debug_buffer[BUFLEN];
static size_t offset = 0;
/** Initialize stdout to something that does not print, but does not fail
 *
 * Save data in some buffer so that it could be retrieved in the debugger
 */
static void null_putchar(chardev_t *d, const char ch)
{
    if (offset >= BUFLEN)
        offset = 0;
    debug_buffer[offset++] = ch;
}
 
static chardev_operations_t null_stdout_ops = {
    .write = null_putchar
};
chardev_t null_stdout = {
    .name = "null",
    .op = &null_stdout_ops
};
 
/** Standard input character device. */
chardev_t *stdin = NULL;
chardev_t *stdout = &null_stdout;
 
/** Get character from character device. Do not echo character.
 *
 * @param chardev Character device.
 *
 * @return Character read.
 */
uint8_t _getc(chardev_t *chardev)
{
    uint8_t ch;
    ipl_t ipl;
 
    if (atomic_get(&haltstate)) {
        /* If we are here, we are hopefully on the processor, that
         * issued the 'halt' command, so proceed to read the character
         * directly from input
         */
        if (chardev->op->read)
            return chardev->op->read(chardev);
        /* no other way of interacting with user, halt */
        if (CPU)
            printf("cpu%d: ", CPU->id);
        else
            printf("cpu: ");
        printf("halted - no kconsole\n");
        cpu_halt();
    }
 
    waitq_sleep(&chardev->wq);
    ipl = interrupts_disable();
    spinlock_lock(&chardev->lock);
    ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
    chardev->counter--;
    spinlock_unlock(&chardev->lock);
    interrupts_restore(ipl);
 
    chardev->op->resume(chardev);
 
    return ch;
}
 
/** Get string from character device.
 *
 * Read characters from character device until first occurrence
 * of newline character.
 *
 * @param chardev Character device.
 * @param buf Buffer where to store string terminated by '\0'.
 * @param buflen Size of the buffer.
 *
 * @return Number of characters read.
 */
count_t gets(chardev_t *chardev, char *buf, size_t buflen)
{
    index_t index = 0;
    char ch;
 
    while (index < buflen) {
        ch = _getc(chardev);
        if (ch == '\b') {
            if (index > 0) {
                index--;
                /* Space backspace, space */
                putchar('\b');
                putchar(' ');
                putchar('\b');
            }
            continue;
        }
        putchar(ch);
 
        if (ch == '\n') { /* end of string => write 0, return */
            buf[index] = '\0';
            return (count_t) index;
        }
        buf[index++] = ch;
    }
    return (count_t) index;
}
 
/** Get character from device & echo it to screen */
uint8_t getc(chardev_t *chardev)
{
    uint8_t ch;
 
    ch = _getc(chardev);
    putchar(ch);
    return ch;
}
 
void putchar(char c)
{
    if (stdout->op->write)
        stdout->op->write(stdout, c);
}
 
/** @}
 */
 

Rev 2089	Rev 2474
1	/*	1	/*
2	* Copyright (c) 2003 Josef Cejka	2	* Copyright (c) 2003 Josef Cejka
3	* Copyright (c) 2005 Jakub Jermar	3	* Copyright (c) 2005 Jakub Jermar
4	* All rights reserved.	4	* All rights reserved.
5	*	5	*
6	* Redistribution and use in source and binary forms, with or without	6	* Redistribution and use in source and binary forms, with or without
7	* modification, are permitted provided that the following conditions	7	* modification, are permitted provided that the following conditions
8	* are met:	8	* are met:
9	*	9	*
10	* - Redistributions of source code must retain the above copyright	10	* - Redistributions of source code must retain the above copyright
11	* notice, this list of conditions and the following disclaimer.	11	* notice, this list of conditions and the following disclaimer.
12	* - Redistributions in binary form must reproduce the above copyright	12	* - Redistributions in binary form must reproduce the above copyright
13	* notice, this list of conditions and the following disclaimer in the	13	* notice, this list of conditions and the following disclaimer in the
14	* documentation and/or other materials provided with the distribution.	14	* documentation and/or other materials provided with the distribution.
15	* - The name of the author may not be used to endorse or promote products	15	* - The name of the author may not be used to endorse or promote products
16	* derived from this software without specific prior written permission.	16	* derived from this software without specific prior written permission.
17	*	17	*
18	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	18	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	19	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	20	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	21	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	22	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	23	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	24	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	25	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	26	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	27	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28	*/	28	*/
29		29
30	/** @addtogroup genericconsole	30	/** @addtogroup genericconsole
31	* @{	31	* @{
32	*/	32	*/
33	/** @file	33	/** @file
34	*/	34	*/
35		35
36	#include <console/console.h>	36	#include <console/console.h>
37	#include <console/chardev.h>	37	#include <console/chardev.h>
38	#include <synch/waitq.h>	38	#include <synch/waitq.h>
39	#include <synch/spinlock.h>	39	#include <synch/spinlock.h>
40	#include <arch/types.h>	40	#include <arch/types.h>
41	#include <arch.h>	41	#include <arch.h>
42	#include <func.h>	42	#include <func.h>
43	#include <print.h>	43	#include <print.h>
44	#include <atomic.h>	44	#include <atomic.h>
45		45
46	#define BUFLEN 2048	46	#define BUFLEN 2048
47	static char debug_buffer[BUFLEN];	47	static char debug_buffer[BUFLEN];
48	static size_t offset = 0;	48	static size_t offset = 0;
49	/** Initialize stdout to something that does not print, but does not fail	49	/** Initialize stdout to something that does not print, but does not fail
50	*	50	*
51	* Save data in some buffer so that it could be retrieved in the debugger	51	* Save data in some buffer so that it could be retrieved in the debugger
52	*/	52	*/
53	static void null_putchar(chardev_t *d, const char ch)	53	static void null_putchar(chardev_t *d, const char ch)
54	{	54	{
55	if (offset >= BUFLEN)	55	if (offset >= BUFLEN)
56	offset = 0;	56	offset = 0;
57	debug_buffer[offset++] = ch;	57	debug_buffer[offset++] = ch;
58	}	58	}
59		59
60	static chardev_operations_t null_stdout_ops = {	60	static chardev_operations_t null_stdout_ops = {
61	.write = null_putchar	61	.write = null_putchar
62	};	62	};
63	chardev_t null_stdout = {	63	chardev_t null_stdout = {
64	.name = "null",	64	.name = "null",
65	.op = &null_stdout_ops	65	.op = &null_stdout_ops
66	};	66	};
67		67
68	/** Standard input character device. */	68	/** Standard input character device. */
69	chardev_t *stdin = NULL;	69	chardev_t *stdin = NULL;
70	chardev_t *stdout = &null_stdout;	70	chardev_t *stdout = &null_stdout;
71		71
72	/** Get character from character device. Do not echo character.	72	/** Get character from character device. Do not echo character.
73	*	73	*
74	* @param chardev Character device.	74	* @param chardev Character device.
75	*	75	*
76	* @return Character read.	76	* @return Character read.
77	*/	77	*/
78	uint8_t _getc(chardev_t *chardev)	78	uint8_t _getc(chardev_t *chardev)
79	{	79	{
80	uint8_t ch;	80	uint8_t ch;
81	ipl_t ipl;	81	ipl_t ipl;
82		82
83	if (atomic_get(&haltstate)) {	83	if (atomic_get(&haltstate)) {
84	/* If we are here, we are hopefully on the processor, that	84	/* If we are here, we are hopefully on the processor, that
85	* issued the 'halt' command, so proceed to read the character	85	* issued the 'halt' command, so proceed to read the character
86	* directly from input	86	* directly from input
87	*/	87	*/
88	if (chardev->op->read)	88	if (chardev->op->read)
89	return chardev->op->read(chardev);	89	return chardev->op->read(chardev);
90	/* no other way of interacting with user, halt */	90	/* no other way of interacting with user, halt */
91	if (CPU)	91	if (CPU)
92	printf("cpu%d: ", CPU->id);	92	printf("cpu%d: ", CPU->id);
93	else	93	else
94	printf("cpu: ");	94	printf("cpu: ");
95	printf("halted - no kconsole\n");	95	printf("halted - no kconsole\n");
96	cpu_halt();	96	cpu_halt();
97	}	97	}
98		98
99	waitq_sleep(&chardev->wq);	99	waitq_sleep(&chardev->wq);
100	ipl = interrupts_disable();	100	ipl = interrupts_disable();
101	spinlock_lock(&chardev->lock);	101	spinlock_lock(&chardev->lock);
102	ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];	102	ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
103	chardev->counter--;	103	chardev->counter--;
104	spinlock_unlock(&chardev->lock);	104	spinlock_unlock(&chardev->lock);
105	interrupts_restore(ipl);	105	interrupts_restore(ipl);
106		106
107	chardev->op->resume(chardev);	107	chardev->op->resume(chardev);
108		108
109	return ch;	109	return ch;
110	}	110	}
111		111
112	/** Get string from character device.	112	/** Get string from character device.
113	*	113	*
114	* Read characters from character device until first occurrence	114	* Read characters from character device until first occurrence
115	* of newline character.	115	* of newline character.
116	*	116	*
117	* @param chardev Character device.	117	* @param chardev Character device.
118	* @param buf Buffer where to store string terminated by '\0'.	118	* @param buf Buffer where to store string terminated by '\0'.
119	* @param buflen Size of the buffer.	119	* @param buflen Size of the buffer.
120	*	120	*
121	* @return Number of characters read.	121	* @return Number of characters read.
122	*/	122	*/
123	count_t gets(chardev_t chardev, char buf, size_t buflen)	123	count_t gets(chardev_t chardev, char buf, size_t buflen)
124	{	124	{
125	index_t index = 0;	125	index_t index = 0;
126	char ch;	126	char ch;
127		127
128	while (index < buflen) {	128	while (index < buflen) {
129	ch = _getc(chardev);	129	ch = _getc(chardev);
130	if (ch == '\b') {	130	if (ch == '\b') {
131	if (index > 0) {	131	if (index > 0) {
132	index--;	132	index--;
133	/* Space backspace, space */	133	/* Space backspace, space */
134	putchar('\b');	134	putchar('\b');
135	putchar(' ');	135	putchar(' ');
136	putchar('\b');	136	putchar('\b');
137	}	137	}
138	continue;	138	continue;
139	}	139	}
140	putchar(ch);	140	putchar(ch);
141		141
142	if (ch == '\n') { /* end of string => write 0, return */	142	if (ch == '\n') { /* end of string => write 0, return */
143	buf[index] = '\0';	143	buf[index] = '\0';
144	return (count_t) index;	144	return (count_t) index;
145	}	145	}
146	buf[index++] = ch;	146	buf[index++] = ch;
147	}	147	}
148	return (count_t) index;	148	return (count_t) index;
149	}	149	}
150		150
151	/** Get character from device & echo it to screen */	151	/** Get character from device & echo it to screen */
152	uint8_t getc(chardev_t *chardev)	152	uint8_t getc(chardev_t *chardev)
153	{	153	{
154	uint8_t ch;	154	uint8_t ch;
155		155
156	ch = _getc(chardev);	156	ch = _getc(chardev);
157	putchar(ch);	157	putchar(ch);
158	return ch;	158	return ch;
159	}	159	}
160		160
161	void putchar(char c)	161	void putchar(char c)
162	{	162	{
163	if (stdout->op->write)	163	if (stdout->op->write)
164	stdout->op->write(stdout, c);	164	stdout->op->write(stdout, c);
165	}	165	}
166		166
167	/** @}	167	/** @}
168	*/	168	*/
169		169

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(root)/tags/0.2.0.5/kernel/generic/src/console/console.c – Rev 2089 → 2474