[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / x86 / kernel / early_printk.c

#include <linux/console.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/screen_info.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/fcntl.h>
#include <asm/setup.h>
#include <xen/hvc-console.h>

/* Simple VGA output */
#define VGABASE		(__ISA_IO_base + 0xb8000)

static int max_ypos = 25, max_xpos = 80;
static int current_ypos = 25, current_xpos = 0;

static void early_vga_write(struct console *con, const char *str, unsigned n)
{
	char c;
	int  i, k, j;

	while ((c = *str++) != '\0' && n-- > 0) {
		if (current_ypos >= max_ypos) {
			/* scroll 1 line up */
			for (k = 1, j = 0; k < max_ypos; k++, j++) {
				for (i = 0; i < max_xpos; i++) {
					writew(readw(VGABASE+2*(max_xpos*k+i)),
					       VGABASE + 2*(max_xpos*j + i));
				}
			}
			for (i = 0; i < max_xpos; i++)
				writew(0x720, VGABASE + 2*(max_xpos*j + i));
			current_ypos = max_ypos-1;
		}
		if (c == '\n') {
			current_xpos = 0;
			current_ypos++;
		} else if (c != '\r')  {
			writew(((0x7 << 8) | (unsigned short) c),
			       VGABASE + 2*(max_xpos*current_ypos +
						current_xpos++));
			if (current_xpos >= max_xpos) {
				current_xpos = 0;
				current_ypos++;
			}
		}
	}
}

static struct console early_vga_console = {
	.name =		"earlyvga",
	.write =	early_vga_write,
	.flags =	CON_PRINTBUFFER,
	.index =	-1,
};

/* Serial functions loosely based on a similar package from Klaus P. Gerlicher */

static int early_serial_base = 0x3f8;  /* ttyS0 */

#define XMTRDY          0x20

#define DLAB		0x80

#define TXR             0       /*  Transmit register (WRITE) */
#define RXR             0       /*  Receive register  (READ)  */
#define IER             1       /*  Interrupt Enable          */
#define IIR             2       /*  Interrupt ID              */
#define FCR             2       /*  FIFO control              */
#define LCR             3       /*  Line control              */
#define MCR             4       /*  Modem control             */
#define LSR             5       /*  Line Status               */
#define MSR             6       /*  Modem Status              */
#define DLL             0       /*  Divisor Latch Low         */
#define DLH             1       /*  Divisor latch High        */

static int early_serial_putc(unsigned char ch)
{
	unsigned timeout = 0xffff;
	while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
		cpu_relax();
	outb(ch, early_serial_base + TXR);
	return timeout ? 0 : -1;
}

static void early_serial_write(struct console *con, const char *s, unsigned n)
{
	while (*s && n-- > 0) {
		if (*s == '\n')
			early_serial_putc('\r');
		early_serial_putc(*s);
		s++;
	}
}

#define DEFAULT_BAUD 9600

static __init void early_serial_init(char *s)
{
	unsigned char c;
	unsigned divisor;
	unsigned baud = DEFAULT_BAUD;
	char *e;

	if (*s == ',')
		++s;

	if (*s) {
		unsigned port;
		if (!strncmp(s, "0x", 2)) {
			early_serial_base = simple_strtoul(s, &e, 16);
		} else {
			static int bases[] = { 0x3f8, 0x2f8 };

			if (!strncmp(s, "ttyS", 4))
				s += 4;
			port = simple_strtoul(s, &e, 10);
			if (port > 1 || s == e)
				port = 0;
			early_serial_base = bases[port];
		}
		s += strcspn(s, ",");
		if (*s == ',')
			s++;
	}

	outb(0x3, early_serial_base + LCR);	/* 8n1 */
	outb(0, early_serial_base + IER);	/* no interrupt */
	outb(0, early_serial_base + FCR);	/* no fifo */
	outb(0x3, early_serial_base + MCR);	/* DTR + RTS */

	if (*s) {
		baud = simple_strtoul(s, &e, 0);
		if (baud == 0 || s == e)
			baud = DEFAULT_BAUD;
	}

	divisor = 115200 / baud;
	c = inb(early_serial_base + LCR);
	outb(c | DLAB, early_serial_base + LCR);
	outb(divisor & 0xff, early_serial_base + DLL);
	outb((divisor >> 8) & 0xff, early_serial_base + DLH);
	outb(c & ~DLAB, early_serial_base + LCR);
}

static struct console early_serial_console = {
	.name =		"earlyser",
	.write =	early_serial_write,
	.flags =	CON_PRINTBUFFER,
	.index =	-1,
};

/* Console interface to a host file on AMD's SimNow! */

static int simnow_fd;

enum {
	MAGIC1 = 0xBACCD00A,
	MAGIC2 = 0xCA110000,
	XOPEN = 5,
	XWRITE = 4,
};

static noinline long simnow(long cmd, long a, long b, long c)
{
	long ret;
	asm volatile("cpuid" :
		     "=a" (ret) :
		     "b" (a), "c" (b), "d" (c), "0" (MAGIC1), "D" (cmd + MAGIC2));
	return ret;
}

static void __init simnow_init(char *str)
{
	char *fn = "klog";
	if (*str == '=')
		fn = ++str;
	/* error ignored */
	simnow_fd = simnow(XOPEN, (unsigned long)fn, O_WRONLY|O_APPEND|O_CREAT, 0644);
}

static void simnow_write(struct console *con, const char *s, unsigned n)
{
	simnow(XWRITE, simnow_fd, (unsigned long)s, n);
}

static struct console simnow_console = {
	.name =		"simnow",
	.write =	simnow_write,
	.flags =	CON_PRINTBUFFER,
	.index =	-1,
};

/* Direct interface for emergencies */
static struct console *early_console = &early_vga_console;
static int early_console_initialized = 0;

void early_printk(const char *fmt, ...)
{
	char buf[512];
	int n;
	va_list ap;

	va_start(ap, fmt);
	n = vscnprintf(buf, 512, fmt, ap);
	early_console->write(early_console, buf, n);
	va_end(ap);
}

static int __initdata keep_early;

static int __init setup_early_printk(char *buf)
{
	if (!buf)
		return 0;

	if (early_console_initialized)
		return 0;
	early_console_initialized = 1;

	if (strstr(buf, "keep"))
		keep_early = 1;

	if (!strncmp(buf, "serial", 6)) {
		early_serial_init(buf + 6);
		early_console = &early_serial_console;
	} else if (!strncmp(buf, "ttyS", 4)) {
		early_serial_init(buf);
		early_console = &early_serial_console;
	} else if (!strncmp(buf, "vga", 3)
		&& boot_params.screen_info.orig_video_isVGA == 1) {
		max_xpos = boot_params.screen_info.orig_video_cols;
		max_ypos = boot_params.screen_info.orig_video_lines;
		current_ypos = boot_params.screen_info.orig_y;
		early_console = &early_vga_console;
	} else if (!strncmp(buf, "simnow", 6)) {
		simnow_init(buf + 6);
		early_console = &simnow_console;
		keep_early = 1;
#ifdef CONFIG_HVC_XEN
	} else if (!strncmp(buf, "xen", 3)) {
		early_console = &xenboot_console;
#endif
	}

	if (keep_early)
		early_console->flags &= ~CON_BOOT;
	else
		early_console->flags |= CON_BOOT;
	register_console(early_console);
	return 0;
}
early_param("earlyprintk", setup_early_printk);
Commit	Line	Data
250c2277 TG	1	#include <linux/console.h>
	2	#include <linux/kernel.h>
	3	#include <linux/init.h>
	4	#include <linux/string.h>
	5	#include <linux/screen_info.h>
	6	#include <asm/io.h>
	7	#include <asm/processor.h>
	8	#include <asm/fcntl.h>
30c82645	9	#include <asm/setup.h>
250c2277	10	#include <xen/hvc-console.h>
1da177e4	11
250c2277	12	/* Simple VGA output */
250c2277 TG	13	#define VGABASE (__ISA_IO_base + 0xb8000)
	14
	15	static int max_ypos = 25, max_xpos = 80;
	16	static int current_ypos = 25, current_xpos = 0;
	17
	18	static void early_vga_write(struct console con, const char str, unsigned n)
	19	{
	20	char c;
	21	int i, k, j;
	22
	23	while ((c = *str++) != '\0' && n-- > 0) {
	24	if (current_ypos >= max_ypos) {
	25	/* scroll 1 line up */
	26	for (k = 1, j = 0; k < max_ypos; k++, j++) {
	27	for (i = 0; i < max_xpos; i++) {
	28	writew(readw(VGABASE+2(max_xposk+i)),
	29	VGABASE + 2(max_xposj + i));
	30	}
	31	}
	32	for (i = 0; i < max_xpos; i++)
	33	writew(0x720, VGABASE + 2(max_xposj + i));
	34	current_ypos = max_ypos-1;
	35	}
	36	if (c == '\n') {
	37	current_xpos = 0;
	38	current_ypos++;
	39	} else if (c != '\r') {
	40	writew(((0x7 << 8) \| (unsigned short) c),
	41	VGABASE + 2(max_xposcurrent_ypos +
	42	current_xpos++));
	43	if (current_xpos >= max_xpos) {
	44	current_xpos = 0;
	45	current_ypos++;
	46	}
	47	}
	48	}
	49	}
	50
	51	static struct console early_vga_console = {
	52	.name = "earlyvga",
	53	.write = early_vga_write,
	54	.flags = CON_PRINTBUFFER,
	55	.index = -1,
	56	};
	57
	58	/* Serial functions loosely based on a similar package from Klaus P. Gerlicher */
	59
	60	static int early_serial_base = 0x3f8; /* ttyS0 */
	61
	62	#define XMTRDY 0x20
	63
	64	#define DLAB 0x80
	65
	66	#define TXR 0 /* Transmit register (WRITE) */
	67	#define RXR 0 /* Receive register (READ) */
	68	#define IER 1 /* Interrupt Enable */
	69	#define IIR 2 /* Interrupt ID */
	70	#define FCR 2 /* FIFO control */
	71	#define LCR 3 /* Line control */
	72	#define MCR 4 /* Modem control */
	73	#define LSR 5 /* Line Status */
	74	#define MSR 6 /* Modem Status */
	75	#define DLL 0 /* Divisor Latch Low */
	76	#define DLH 1 /* Divisor latch High */
77
78	static int early_serial_putc(unsigned char ch)
79	{
80	unsigned timeout = 0xffff;
81	while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
82	cpu_relax();
83	outb(ch, early_serial_base + TXR);
84	return timeout ? 0 : -1;
85	}
86
87	static void early_serial_write(struct console con, const char s, unsigned n)
88	{
89	while (*s && n-- > 0) {
90	if (*s == '\n')
91	early_serial_putc('\r');
92	early_serial_putc(*s);
93	s++;
94	}
95	}
96
97	#define DEFAULT_BAUD 9600
98
99	static __init void early_serial_init(char *s)
100	{
101	unsigned char c;
102	unsigned divisor;
103	unsigned baud = DEFAULT_BAUD;
104	char *e;
105
106	if (*s == ',')
107	++s;
108
109	if (*s) {
110	unsigned port;
e941f27a	111	if (!strncmp(s, "0x", 2)) {
250c2277 TG	112	early_serial_base = simple_strtoul(s, &e, 16);
	113	} else {
	114	static int bases[] = { 0x3f8, 0x2f8 };
	115
e941f27a	116	if (!strncmp(s, "ttyS", 4))
250c2277 TG	117	s += 4;
	118	port = simple_strtoul(s, &e, 10);
	119	if (port > 1 \|\| s == e)
	120	port = 0;
	121	early_serial_base = bases[port];
	122	}
	123	s += strcspn(s, ",");
	124	if (*s == ',')
	125	s++;
	126	}
	127
	128	outb(0x3, early_serial_base + LCR); /* 8n1 */
	129	outb(0, early_serial_base + IER); /* no interrupt */
	130	outb(0, early_serial_base + FCR); /* no fifo */
	131	outb(0x3, early_serial_base + MCR); /* DTR + RTS */
	132
	133	if (*s) {
	134	baud = simple_strtoul(s, &e, 0);
	135	if (baud == 0 \|\| s == e)
	136	baud = DEFAULT_BAUD;
	137	}
	138
	139	divisor = 115200 / baud;
	140	c = inb(early_serial_base + LCR);
	141	outb(c \| DLAB, early_serial_base + LCR);
	142	outb(divisor & 0xff, early_serial_base + DLL);
	143	outb((divisor >> 8) & 0xff, early_serial_base + DLH);
	144	outb(c & ~DLAB, early_serial_base + LCR);
	145	}
	146
	147	static struct console early_serial_console = {
	148	.name = "earlyser",
	149	.write = early_serial_write,
	150	.flags = CON_PRINTBUFFER,
	151	.index = -1,
	152	};
	153
	154	/* Console interface to a host file on AMD's SimNow! */
	155
	156	static int simnow_fd;
	157
	158	enum {
	159	MAGIC1 = 0xBACCD00A,
	160	MAGIC2 = 0xCA110000,
	161	XOPEN = 5,
	162	XWRITE = 4,
	163	};
	164
	165	static noinline long simnow(long cmd, long a, long b, long c)
	166	{
	167	long ret;
	168	asm volatile("cpuid" :
	169	"=a" (ret) :
	170	"b" (a), "c" (b), "d" (c), "0" (MAGIC1), "D" (cmd + MAGIC2));
	171	return ret;
	172	}
	173
	174	static void __init simnow_init(char *str)
	175	{
	176	char *fn = "klog";
	177	if (*str == '=')
	178	fn = ++str;
	179	/* error ignored */
	180	simnow_fd = simnow(XOPEN, (unsigned long)fn, O_WRONLY\|O_APPEND\|O_CREAT, 0644);
181	}
182
183	static void simnow_write(struct console con, const char s, unsigned n)
184	{
185	simnow(XWRITE, simnow_fd, (unsigned long)s, n);
186	}
187
188	static struct console simnow_console = {
189	.name = "simnow",
190	.write = simnow_write,
191	.flags = CON_PRINTBUFFER,
192	.index = -1,
193	};
194
195	/* Direct interface for emergencies */
bb0e1290	196	static struct console *early_console = &early_vga_console;
250c2277 TG	197	static int early_console_initialized = 0;
	198
	199	void early_printk(const char *fmt, ...)
	200	{
	201	char buf[512];
	202	int n;
	203	va_list ap;
	204
e941f27a PC	205	va_start(ap, fmt);
	206	n = vscnprintf(buf, 512, fmt, ap);
	207	early_console->write(early_console, buf, n);
250c2277 TG	208	va_end(ap);
	209	}
	210
	211	static int __initdata keep_early;
	212
	213	static int __init setup_early_printk(char *buf)
	214	{
	215	if (!buf)
	216	return 0;
	217
	218	if (early_console_initialized)
	219	return 0;
	220	early_console_initialized = 1;
	221
	222	if (strstr(buf, "keep"))
	223	keep_early = 1;
	224
	225	if (!strncmp(buf, "serial", 6)) {
	226	early_serial_init(buf + 6);
	227	early_console = &early_serial_console;
	228	} else if (!strncmp(buf, "ttyS", 4)) {
	229	early_serial_init(buf);
	230	early_console = &early_serial_console;
	231	} else if (!strncmp(buf, "vga", 3)
e941f27a	232	&& boot_params.screen_info.orig_video_isVGA == 1) {
30c82645 PA	233	max_xpos = boot_params.screen_info.orig_video_cols;
	234	max_ypos = boot_params.screen_info.orig_video_lines;
	235	current_ypos = boot_params.screen_info.orig_y;
250c2277	236	early_console = &early_vga_console;
e941f27a PC	237	} else if (!strncmp(buf, "simnow", 6)) {
	238	simnow_init(buf + 6);
	239	early_console = &simnow_console;
	240	keep_early = 1;
250c2277 TG	241	#ifdef CONFIG_HVC_XEN
	242	} else if (!strncmp(buf, "xen", 3)) {
	243	early_console = &xenboot_console;
	244	#endif
	245	}
	246
	247	if (keep_early)
	248	early_console->flags &= ~CON_BOOT;
	249	else
	250	early_console->flags \|= CON_BOOT;
	251	register_console(early_console);
	252	return 0;
	253	}
	254	early_param("earlyprintk", setup_early_printk);