WebSVN – HelenOS – Diff – /trunk/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 <sysinfo/sysinfo.h>
#include <synch/waitq.h>
#include <synch/spinlock.h>
#include <arch/types.h>
#include <ddi/device.h>
#include <ddi/irq.h>
#include <ddi/ddi.h>
#include <ipc/irq.h>
#include <arch.h>
#include <func.h>
#include <print.h>
#include <atomic.h>
 
#define KLOG_SIZE PAGE_SIZE
#define KLOG_LATENCY 8
 
/**< Kernel log cyclic buffer */
static char klog[KLOG_SIZE] __attribute__ ((aligned (PAGE_SIZE)));
 
/**< Kernel log initialized */
static bool klog_inited = false;
/**< First kernel log characters */
static index_t klog_start = 0;
/**< Number of valid kernel log characters */
static size_t klog_len = 0;
/**< Number of stored (not printed) kernel log characters */
static size_t klog_stored = 0;
/**< Number of stored kernel log characters for uspace */
static size_t klog_uspace = 0;
 
/**< Silent output */
static bool silent = false;
 
/**< Kernel log spinlock */
SPINLOCK_INITIALIZE(klog_lock);
 
/** Physical memory area used for klog buffer */
static parea_t klog_parea;
 
/*
 * For now, we use 0 as INR.
 * However, it is therefore desirable to have architecture specific
 * definition of KLOG_VIRT_INR in the future.
 */
#define KLOG_VIRT_INR   0
 
static irq_t klog_irq;
 
static chardev_operations_t null_stdout_ops = {
    .suspend = NULL,
    .resume = NULL,
    .write = NULL,
    .read = NULL
};
 
chardev_t null_stdout = {
    .name = "null",
    .op = &null_stdout_ops
};
 
/** Allways refuse IRQ ownership.
 *
 * This is not a real IRQ, so we always decline.
 *
 * @return Always returns IRQ_DECLINE.
 */
static irq_ownership_t klog_claim(void *instance)
{
    return IRQ_DECLINE;
}
 
/** Standard input character device */
chardev_t *stdin = NULL;
chardev_t *stdout = &null_stdout;
 
/** Initialize kernel logging facility
 *
 * The shared area contains kernel cyclic buffer. Userspace application may
 * be notified on new data with indication of position and size
 * of the data within the circular buffer.
 */
void klog_init(void)
{
    void *faddr = (void *) KA2PA(klog);
   
    ASSERT((uintptr_t) faddr % FRAME_SIZE == 0);
    ASSERT(KLOG_SIZE % FRAME_SIZE == 0);
 
    devno_t devno = device_assign_devno();
   
    klog_parea.pbase = (uintptr_t) faddr;
 
    klog_parea.frames = SIZE2FRAMES(KLOG_SIZE);
 
    ddi_parea_register(&klog_parea);
 
    sysinfo_set_item_val("klog.faddr", NULL, (unative_t) faddr);
    sysinfo_set_item_val("klog.pages", NULL, SIZE2FRAMES(KLOG_SIZE));
    sysinfo_set_item_val("klog.devno", NULL, devno);
    sysinfo_set_item_val("klog.inr", NULL, KLOG_VIRT_INR);
 
    irq_initialize(&klog_irq);
    klog_irq.devno = devno;
    klog_irq.inr = KLOG_VIRT_INR;
    klog_irq.claim = klog_claim;
    irq_register(&klog_irq);
   
    spinlock_lock(&klog_lock);
    klog_inited = true;
    spinlock_unlock(&klog_lock);
}
 
void grab_console(void)
{
    silent = false;
    arch_grab_console();
}
 
void release_console(void)
{
    silent = true;
    arch_release_console();
}
 
/** 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%u: ", 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 klog_update(void)
{
    spinlock_lock(&klog_lock);
   
    if ((klog_inited) && (klog_irq.notif_cfg.notify) && (klog_uspace > 0)) {
        ipc_irq_send_msg_3(&klog_irq, klog_start, klog_len, klog_uspace);
        klog_uspace = 0;
    }
   
    spinlock_unlock(&klog_lock);
}
 
void putchar(char c)
{
    spinlock_lock(&klog_lock);
   
    if ((klog_stored > 0) && (stdout->op->write)) {
        /* Print charaters stored in kernel log */
        index_t i;
        for (i = klog_len - klog_stored; i < klog_len; i++)
            stdout->op->write(stdout, klog[(klog_start + i) % KLOG_SIZE], silent);
        klog_stored = 0;
    }
   
    /* Store character in the cyclic kernel log */
    klog[(klog_start + klog_len) % KLOG_SIZE] = c;
    if (klog_len < KLOG_SIZE)
        klog_len++;
    else
        klog_start = (klog_start + 1) % KLOG_SIZE;
   
    if (stdout->op->write)
        stdout->op->write(stdout, c, silent);
    else {
        /* The character is just in the kernel log */
        if (klog_stored < klog_len)
            klog_stored++;
    }
   
    /* The character is stored for uspace */
    if (klog_uspace < klog_len)
        klog_uspace++;
   
    /* Check notify uspace to update */
    bool update;
    if ((klog_uspace > KLOG_LATENCY) || (c == '\n'))
        update = true;
    else
        update = false;
   
    spinlock_unlock(&klog_lock);
   
    if (update)
        klog_update();
}
 
/** @}
 */
 

Rev 3906	Rev 3908
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 <sysinfo/sysinfo.h>	38	#include <sysinfo/sysinfo.h>
39	#include <synch/waitq.h>	39	#include <synch/waitq.h>
40	#include <synch/spinlock.h>	40	#include <synch/spinlock.h>
41	#include <arch/types.h>	41	#include <arch/types.h>
42	#include <ddi/device.h>	42	#include <ddi/device.h>
43	#include <ddi/irq.h>	43	#include <ddi/irq.h>
44	#include <ddi/ddi.h>	44	#include <ddi/ddi.h>
45	#include <ipc/irq.h>	45	#include <ipc/irq.h>
46	#include <arch.h>	46	#include <arch.h>
47	#include <func.h>	47	#include <func.h>
48	#include <print.h>	48	#include <print.h>
49	#include <atomic.h>	49	#include <atomic.h>
50		50
51	#define KLOG_SIZE PAGE_SIZE	51	#define KLOG_SIZE PAGE_SIZE
52	#define KLOG_LATENCY 8	52	#define KLOG_LATENCY 8
53		53
54	/*< Kernel log cyclic buffer /	54	/*< Kernel log cyclic buffer /
55	static char klog[KLOG_SIZE] __attribute__ ((aligned (PAGE_SIZE)));	55	static char klog[KLOG_SIZE] __attribute__ ((aligned (PAGE_SIZE)));
56		56
57	/*< Kernel log initialized /	57	/*< Kernel log initialized /
58	static bool klog_inited = false;	58	static bool klog_inited = false;
59	/*< First kernel log characters /	59	/*< First kernel log characters /
60	static index_t klog_start = 0;	60	static index_t klog_start = 0;
61	/*< Number of valid kernel log characters /	61	/*< Number of valid kernel log characters /
62	static size_t klog_len = 0;	62	static size_t klog_len = 0;
63	/*< Number of stored (not printed) kernel log characters /	63	/*< Number of stored (not printed) kernel log characters /
64	static size_t klog_stored = 0;	64	static size_t klog_stored = 0;
65	/*< Number of stored kernel log characters for uspace /	65	/*< Number of stored kernel log characters for uspace /
66	static size_t klog_uspace = 0;	66	static size_t klog_uspace = 0;
67		67
68	/*< Silent output /	68	/*< Silent output /
69	static bool silent = false;	69	static bool silent = false;
70		70
71	/*< Kernel log spinlock /	71	/*< Kernel log spinlock /
72	SPINLOCK_INITIALIZE(klog_lock);	72	SPINLOCK_INITIALIZE(klog_lock);
73		73
74	/** Physical memory area used for klog buffer */	74	/** Physical memory area used for klog buffer */
75	static parea_t klog_parea;	75	static parea_t klog_parea;
76		76
77	/*	77	/*
78	* For now, we use 0 as INR.	78	* For now, we use 0 as INR.
79	* However, it is therefore desirable to have architecture specific	79	* However, it is therefore desirable to have architecture specific
80	* definition of KLOG_VIRT_INR in the future.	80	* definition of KLOG_VIRT_INR in the future.
81	*/	81	*/
82	#define KLOG_VIRT_INR 0	82	#define KLOG_VIRT_INR 0
83		83
84	static irq_t klog_irq;	84	static irq_t klog_irq;
85		85
86	static chardev_operations_t null_stdout_ops = {	86	static chardev_operations_t null_stdout_ops = {
87	.suspend = NULL,	87	.suspend = NULL,
88	.resume = NULL,	88	.resume = NULL,
89	.write = NULL,	89	.write = NULL,
90	.read = NULL	90	.read = NULL
91	};	91	};
92		92
93	chardev_t null_stdout = {	93	chardev_t null_stdout = {
94	.name = "null",	94	.name = "null",
95	.op = &null_stdout_ops	95	.op = &null_stdout_ops
96	};	96	};
97		97
98	/** Allways refuse IRQ ownership.	98	/** Allways refuse IRQ ownership.
99	*	99	*
100	* This is not a real IRQ, so we always decline.	100	* This is not a real IRQ, so we always decline.
101	*	101	*
102	* @return Always returns IRQ_DECLINE.	102	* @return Always returns IRQ_DECLINE.
103	*/	103	*/
104	static irq_ownership_t klog_claim(void *instance)	104	static irq_ownership_t klog_claim(void *instance)
105	{	105	{
106	return IRQ_DECLINE;	106	return IRQ_DECLINE;
107	}	107	}
108		108
109	/** Standard input character device */	109	/** Standard input character device */
110	chardev_t *stdin = NULL;	110	chardev_t *stdin = NULL;
111	chardev_t *stdout = &null_stdout;	111	chardev_t *stdout = &null_stdout;
112		112
113	/** Initialize kernel logging facility	113	/** Initialize kernel logging facility
114	*	114	*
115	* The shared area contains kernel cyclic buffer. Userspace application may	115	* The shared area contains kernel cyclic buffer. Userspace application may
116	* be notified on new data with indication of position and size	116	* be notified on new data with indication of position and size
117	* of the data within the circular buffer.	117	* of the data within the circular buffer.
118	*/	118	*/
119	void klog_init(void)	119	void klog_init(void)
120	{	120	{
121	void faddr = (void ) KA2PA(klog);	121	void faddr = (void ) KA2PA(klog);
122		122
123	ASSERT((uintptr_t) faddr % FRAME_SIZE == 0);	123	ASSERT((uintptr_t) faddr % FRAME_SIZE == 0);
124	ASSERT(KLOG_SIZE % FRAME_SIZE == 0);	124	ASSERT(KLOG_SIZE % FRAME_SIZE == 0);
125		125
126	devno_t devno = device_assign_devno();	126	devno_t devno = device_assign_devno();
127		127
128	klog_parea.pbase = (uintptr_t) faddr;	128	klog_parea.pbase = (uintptr_t) faddr;
129	klog_parea.vbase = (uintptr_t) klog;	-
130	klog_parea.frames = SIZE2FRAMES(KLOG_SIZE);	129	klog_parea.frames = SIZE2FRAMES(KLOG_SIZE);
131	klog_parea.cacheable = true;	-
132	ddi_parea_register(&klog_parea);	130	ddi_parea_register(&klog_parea);
133		131
134	sysinfo_set_item_val("klog.faddr", NULL, (unative_t) faddr);	132	sysinfo_set_item_val("klog.faddr", NULL, (unative_t) faddr);
135	sysinfo_set_item_val("klog.pages", NULL, SIZE2FRAMES(KLOG_SIZE));	133	sysinfo_set_item_val("klog.pages", NULL, SIZE2FRAMES(KLOG_SIZE));
136	sysinfo_set_item_val("klog.devno", NULL, devno);	134	sysinfo_set_item_val("klog.devno", NULL, devno);
137	sysinfo_set_item_val("klog.inr", NULL, KLOG_VIRT_INR);	135	sysinfo_set_item_val("klog.inr", NULL, KLOG_VIRT_INR);
138		136
139	irq_initialize(&klog_irq);	137	irq_initialize(&klog_irq);
140	klog_irq.devno = devno;	138	klog_irq.devno = devno;
141	klog_irq.inr = KLOG_VIRT_INR;	139	klog_irq.inr = KLOG_VIRT_INR;
142	klog_irq.claim = klog_claim;	140	klog_irq.claim = klog_claim;
143	irq_register(&klog_irq);	141	irq_register(&klog_irq);
144		142
145	spinlock_lock(&klog_lock);	143	spinlock_lock(&klog_lock);
146	klog_inited = true;	144	klog_inited = true;
147	spinlock_unlock(&klog_lock);	145	spinlock_unlock(&klog_lock);
148	}	146	}
149		147
150	void grab_console(void)	148	void grab_console(void)
151	{	149	{
152	silent = false;	150	silent = false;
153	arch_grab_console();	151	arch_grab_console();
154	}	152	}
155		153
156	void release_console(void)	154	void release_console(void)
157	{	155	{
158	silent = true;	156	silent = true;
159	arch_release_console();	157	arch_release_console();
160	}	158	}
161		159
162	/** Get character from character device. Do not echo character.	160	/** Get character from character device. Do not echo character.
163	*	161	*
164	* @param chardev Character device.	162	* @param chardev Character device.
165	*	163	*
166	* @return Character read.	164	* @return Character read.
167	*/	165	*/
168	uint8_t _getc(chardev_t *chardev)	166	uint8_t _getc(chardev_t *chardev)
169	{	167	{
170	uint8_t ch;	168	uint8_t ch;
171	ipl_t ipl;	169	ipl_t ipl;
172		170
173	if (atomic_get(&haltstate)) {	171	if (atomic_get(&haltstate)) {
174	/* If we are here, we are hopefully on the processor, that	172	/* If we are here, we are hopefully on the processor, that
175	* issued the 'halt' command, so proceed to read the character	173	* issued the 'halt' command, so proceed to read the character
176	* directly from input	174	* directly from input
177	*/	175	*/
178	if (chardev->op->read)	176	if (chardev->op->read)
179	return chardev->op->read(chardev);	177	return chardev->op->read(chardev);
180	/* no other way of interacting with user, halt */	178	/* no other way of interacting with user, halt */
181	if (CPU)	179	if (CPU)
182	printf("cpu%u: ", CPU->id);	180	printf("cpu%u: ", CPU->id);
183	else	181	else
184	printf("cpu: ");	182	printf("cpu: ");
185	printf("halted (no kconsole)\n");	183	printf("halted (no kconsole)\n");
186	cpu_halt();	184	cpu_halt();
187	}	185	}
188		186
189	waitq_sleep(&chardev->wq);	187	waitq_sleep(&chardev->wq);
190	ipl = interrupts_disable();	188	ipl = interrupts_disable();
191	spinlock_lock(&chardev->lock);	189	spinlock_lock(&chardev->lock);
192	ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];	190	ch = chardev->buffer[(chardev->index - chardev->counter) % CHARDEV_BUFLEN];
193	chardev->counter--;	191	chardev->counter--;
194	spinlock_unlock(&chardev->lock);	192	spinlock_unlock(&chardev->lock);
195	interrupts_restore(ipl);	193	interrupts_restore(ipl);
196		194
197	chardev->op->resume(chardev);	195	chardev->op->resume(chardev);
198		196
199	return ch;	197	return ch;
200	}	198	}
201		199
202	/** Get string from character device.	200	/** Get string from character device.
203	*	201	*
204	* Read characters from character device until first occurrence	202	* Read characters from character device until first occurrence
205	* of newline character.	203	* of newline character.
206	*	204	*
207	* @param chardev Character device.	205	* @param chardev Character device.
208	* @param buf Buffer where to store string terminated by '\0'.	206	* @param buf Buffer where to store string terminated by '\0'.
209	* @param buflen Size of the buffer.	207	* @param buflen Size of the buffer.
210	*	208	*
211	* @return Number of characters read.	209	* @return Number of characters read.
212	*/	210	*/
213	count_t gets(chardev_t chardev, char buf, size_t buflen)	211	count_t gets(chardev_t chardev, char buf, size_t buflen)
214	{	212	{
215	index_t index = 0;	213	index_t index = 0;
216	char ch;	214	char ch;
217		215
218	while (index < buflen) {	216	while (index < buflen) {
219	ch = _getc(chardev);	217	ch = _getc(chardev);
220	if (ch == '\b') {	218	if (ch == '\b') {
221	if (index > 0) {	219	if (index > 0) {
222	index--;	220	index--;
223	/* Space backspace, space */	221	/* Space backspace, space */
224	putchar('\b');	222	putchar('\b');
225	putchar(' ');	223	putchar(' ');
226	putchar('\b');	224	putchar('\b');
227	}	225	}
228	continue;	226	continue;
229	}	227	}
230	putchar(ch);	228	putchar(ch);
231		229
232	if (ch == '\n') { /* end of string => write 0, return */	230	if (ch == '\n') { /* end of string => write 0, return */
233	buf[index] = '\0';	231	buf[index] = '\0';
234	return (count_t) index;	232	return (count_t) index;
235	}	233	}
236	buf[index++] = ch;	234	buf[index++] = ch;
237	}	235	}
238	return (count_t) index;	236	return (count_t) index;
239	}	237	}
240		238
241	/** Get character from device & echo it to screen */	239	/** Get character from device & echo it to screen */
242	uint8_t getc(chardev_t *chardev)	240	uint8_t getc(chardev_t *chardev)
243	{	241	{
244	uint8_t ch;	242	uint8_t ch;
245		243
246	ch = _getc(chardev);	244	ch = _getc(chardev);
247	putchar(ch);	245	putchar(ch);
248	return ch;	246	return ch;
249	}	247	}
250		248
251	void klog_update(void)	249	void klog_update(void)
252	{	250	{
253	spinlock_lock(&klog_lock);	251	spinlock_lock(&klog_lock);
254		252
255	if ((klog_inited) && (klog_irq.notif_cfg.notify) && (klog_uspace > 0)) {	253	if ((klog_inited) && (klog_irq.notif_cfg.notify) && (klog_uspace > 0)) {
256	ipc_irq_send_msg_3(&klog_irq, klog_start, klog_len, klog_uspace);	254	ipc_irq_send_msg_3(&klog_irq, klog_start, klog_len, klog_uspace);
257	klog_uspace = 0;	255	klog_uspace = 0;
258	}	256	}
259		257
260	spinlock_unlock(&klog_lock);	258	spinlock_unlock(&klog_lock);
261	}	259	}
262		260
263	void putchar(char c)	261	void putchar(char c)
264	{	262	{
265	spinlock_lock(&klog_lock);	263	spinlock_lock(&klog_lock);
266		264
267	if ((klog_stored > 0) && (stdout->op->write)) {	265	if ((klog_stored > 0) && (stdout->op->write)) {
268	/* Print charaters stored in kernel log */	266	/* Print charaters stored in kernel log */
269	index_t i;	267	index_t i;
270	for (i = klog_len - klog_stored; i < klog_len; i++)	268	for (i = klog_len - klog_stored; i < klog_len; i++)
271	stdout->op->write(stdout, klog[(klog_start + i) % KLOG_SIZE], silent);	269	stdout->op->write(stdout, klog[(klog_start + i) % KLOG_SIZE], silent);
272	klog_stored = 0;	270	klog_stored = 0;
273	}	271	}
274		272
275	/* Store character in the cyclic kernel log */	273	/* Store character in the cyclic kernel log */
276	klog[(klog_start + klog_len) % KLOG_SIZE] = c;	274	klog[(klog_start + klog_len) % KLOG_SIZE] = c;
277	if (klog_len < KLOG_SIZE)	275	if (klog_len < KLOG_SIZE)
278	klog_len++;	276	klog_len++;
279	else	277	else
280	klog_start = (klog_start + 1) % KLOG_SIZE;	278	klog_start = (klog_start + 1) % KLOG_SIZE;
281		279
282	if (stdout->op->write)	280	if (stdout->op->write)
283	stdout->op->write(stdout, c, silent);	281	stdout->op->write(stdout, c, silent);
284	else {	282	else {
285	/* The character is just in the kernel log */	283	/* The character is just in the kernel log */
286	if (klog_stored < klog_len)	284	if (klog_stored < klog_len)
287	klog_stored++;	285	klog_stored++;
288	}	286	}
289		287
290	/* The character is stored for uspace */	288	/* The character is stored for uspace */
291	if (klog_uspace < klog_len)	289	if (klog_uspace < klog_len)
292	klog_uspace++;	290	klog_uspace++;
293		291
294	/* Check notify uspace to update */	292	/* Check notify uspace to update */
295	bool update;	293	bool update;
296	if ((klog_uspace > KLOG_LATENCY) \|\| (c == '\n'))	294	if ((klog_uspace > KLOG_LATENCY) \|\| (c == '\n'))
297	update = true;	295	update = true;
298	else	296	else
299	update = false;	297	update = false;
300		298
301	spinlock_unlock(&klog_lock);	299	spinlock_unlock(&klog_lock);
302		300
303	if (update)	301	if (update)
304	klog_update();	302	klog_update();
305	}	303	}
306		304
307	/** @}	305	/** @}
308	*/	306	*/
309		307

Subversion Repositories HelenOS

(root)/trunk/kernel/generic/src/console/console.c – Rev 3906 → 3908