WebSVN – HelenOS-historic – Diff – /SPARTAN/trunk/arch/ia32/src/drivers/ega.c


/*
 * Copyright (C) 2001-2004 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.
 */
 
#include <arch/ega.h>
#include <putchar.h>
#include <mm/page.h>
#include <arch/mm/page.h>
#include <synch/spinlock.h>
#include <arch/types.h>
#include <arch/asm.h>
#include <memstr.h>
 
/*
 * The EGA driver.
 * Simple and short. Function for displaying characters and "scrolling".
 */
 
static spinlock_t egalock;
static __u32 ega_cursor;
 
void ega_move_cursor(void);
 
void ega_init(void)
{
    __u8 hi, lo;
 
    page_mapping_insert(PA2KA(VIDEORAM), VIDEORAM, PAGE_NOT_CACHEABLE, 0);
    outb(0x3d4,0xe);
    hi = inb(0x3d5);
    outb(0x3d4,0xf);
    lo = inb(0x3d5);
    ega_cursor = (hi<<8)|lo;
    ega_putchar('\n');
}
 
static void ega_display_char(char ch)
{
    __u8 *vram = (__u8 *) PA2KA(VIDEORAM);
   
    vram[ega_cursor*2] = ch;
}
 
/*
 * This function takes care of scrolling.
 */
static void ega_check_cursor(void)
{
    if (ega_cursor < SCREEN)
        return;
 
    memcpy((void *)PA2KA(VIDEORAM), (void *)(PA2KA(VIDEORAM) + ROW*2), (SCREEN - ROW)*2);
    memsetw(PA2KA(VIDEORAM) + (SCREEN - ROW)*2, ROW, 0x0720);
    ega_cursor = ega_cursor - ROW;
}
 
void ega_putchar(const char ch)
{
    ipl_t ipl;
 
    ipl = interrupts_disable();
    spinlock_lock(&egalock);
 
    switch (ch) {
        case '\n':
        ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
        break;
        case '\t':
        ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
        break;
        default:
        ega_display_char(ch);
        ega_cursor++;
        break;
        }
    ega_check_cursor();
    ega_move_cursor();
 
    spinlock_unlock(&egalock);
    interrupts_restore(ipl);
}
 
void ega_move_cursor(void)
{
    outb(0x3d4,0xe);
    outb(0x3d5,(ega_cursor>>8)&0xff);
    outb(0x3d4,0xf);
    outb(0x3d5,ega_cursor&0xff);   
}
 
void putchar(const char ch)
{
    ega_putchar(ch);
}
 

Rev 452	Rev 492
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (C) 2001-2004 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	#include <arch/ega.h>	29	#include <arch/ega.h>
30	#include <putchar.h>	30	#include <putchar.h>
31	#include <mm/page.h>	31	#include <mm/page.h>
32	#include <arch/mm/page.h>	32	#include <arch/mm/page.h>
33	#include <synch/spinlock.h>	33	#include <synch/spinlock.h>
34	#include <arch/types.h>	34	#include <arch/types.h>
35	#include <arch/asm.h>	35	#include <arch/asm.h>
36	#include <memstr.h>	36	#include <memstr.h>
37		37
38	/*	38	/*
39	* The EGA driver.	39	* The EGA driver.
40	* Simple and short. Function for displaying characters and "scrolling".	40	* Simple and short. Function for displaying characters and "scrolling".
41	*/	41	*/
42		42
43	static spinlock_t egalock;	43	static spinlock_t egalock;
44	static __u32 ega_cursor;	44	static __u32 ega_cursor;
45		45
46	void ega_move_cursor(void);	46	void ega_move_cursor(void);
47		47
48	void ega_init(void)	48	void ega_init(void)
49	{	49	{
50	__u8 hi, lo;	50	__u8 hi, lo;
51		51
52	map_page_to_frame(PA2KA(VIDEORAM), VIDEORAM, PAGE_NOT_CACHEABLE, 0);	52	page_mapping_insert(PA2KA(VIDEORAM), VIDEORAM, PAGE_NOT_CACHEABLE, 0);
53	outb(0x3d4,0xe);	53	outb(0x3d4,0xe);
54	hi = inb(0x3d5);	54	hi = inb(0x3d5);
55	outb(0x3d4,0xf);	55	outb(0x3d4,0xf);
56	lo = inb(0x3d5);	56	lo = inb(0x3d5);
57	ega_cursor = (hi<<8)\|lo;	57	ega_cursor = (hi<<8)\|lo;
58	ega_putchar('\n');	58	ega_putchar('\n');
59	}	59	}
60		60
61	static void ega_display_char(char ch)	61	static void ega_display_char(char ch)
62	{	62	{
63	__u8 vram = (__u8 ) PA2KA(VIDEORAM);	63	__u8 vram = (__u8 ) PA2KA(VIDEORAM);
64		64
65	vram[ega_cursor*2] = ch;	65	vram[ega_cursor*2] = ch;
66	}	66	}
67		67
68	/*	68	/*
69	* This function takes care of scrolling.	69	* This function takes care of scrolling.
70	*/	70	*/
71	static void ega_check_cursor(void)	71	static void ega_check_cursor(void)
72	{	72	{
73	if (ega_cursor < SCREEN)	73	if (ega_cursor < SCREEN)
74	return;	74	return;
75		75
76	memcpy((void )PA2KA(VIDEORAM), (void )(PA2KA(VIDEORAM) + ROW2), (SCREEN - ROW)2);	76	memcpy((void )PA2KA(VIDEORAM), (void )(PA2KA(VIDEORAM) + ROW2), (SCREEN - ROW)2);
77	memsetw(PA2KA(VIDEORAM) + (SCREEN - ROW)*2, ROW, 0x0720);	77	memsetw(PA2KA(VIDEORAM) + (SCREEN - ROW)*2, ROW, 0x0720);
78	ega_cursor = ega_cursor - ROW;	78	ega_cursor = ega_cursor - ROW;
79	}	79	}
80		80
81	void ega_putchar(const char ch)	81	void ega_putchar(const char ch)
82	{	82	{
83	ipl_t ipl;	83	ipl_t ipl;
84		84
85	ipl = interrupts_disable();	85	ipl = interrupts_disable();
86	spinlock_lock(&egalock);	86	spinlock_lock(&egalock);
87		87
88	switch (ch) {	88	switch (ch) {
89	case '\n':	89	case '\n':
90	ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;	90	ega_cursor = (ega_cursor + ROW) - ega_cursor % ROW;
91	break;	91	break;
92	case '\t':	92	case '\t':
93	ega_cursor = (ega_cursor + 8) - ega_cursor % 8;	93	ega_cursor = (ega_cursor + 8) - ega_cursor % 8;
94	break;	94	break;
95	default:	95	default:
96	ega_display_char(ch);	96	ega_display_char(ch);
97	ega_cursor++;	97	ega_cursor++;
98	break;	98	break;
99	}	99	}
100	ega_check_cursor();	100	ega_check_cursor();
101	ega_move_cursor();	101	ega_move_cursor();
102		102
103	spinlock_unlock(&egalock);	103	spinlock_unlock(&egalock);
104	interrupts_restore(ipl);	104	interrupts_restore(ipl);
105	}	105	}
106		106
107	void ega_move_cursor(void)	107	void ega_move_cursor(void)
108	{	108	{
109	outb(0x3d4,0xe);	109	outb(0x3d4,0xe);
110	outb(0x3d5,(ega_cursor>>8)&0xff);	110	outb(0x3d5,(ega_cursor>>8)&0xff);
111	outb(0x3d4,0xf);	111	outb(0x3d4,0xf);
112	outb(0x3d5,ega_cursor&0xff);	112	outb(0x3d5,ega_cursor&0xff);
113	}	113	}
114		114
115	void putchar(const char ch)	115	void putchar(const char ch)
116	{	116	{
117	ega_putchar(ch);	117	ega_putchar(ch);
118	}	118	}
119		119

Subversion Repositories HelenOS-historic

(root)/SPARTAN/trunk/arch/ia32/src/drivers/ega.c – Rev 452 → 492