[linux-2.6-block.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 <linux/usb/ch9.h>
#include <linux/pci_regs.h>
#include <linux/pci_ids.h>
#include <linux/errno.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/fcntl.h>
#include <asm/setup.h>
#include <xen/hvc-console.h>
#include <asm/pci-direct.h>
#include <asm/fixmap.h>
#include <asm/intel-mid.h>
#include <asm/pgtable.h>
#include <linux/usb/ehci_def.h>
#include <linux/efi.h>
#include <asm/efi.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;

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;
		}
#ifdef CONFIG_KGDB_KDB
		if (c == '\b') {
			if (current_xpos > 0)
				current_xpos--;
		} else if (c == '\r') {
			current_xpos = 0;
		} else
#endif
		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 const int __initconst 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,
};

static inline void early_console_register(struct console *con, int keep_early)
{
	if (con->index != -1) {
		printk(KERN_CRIT "ERROR: earlyprintk= %s already used\n",
		       con->name);
		return;
	}
	early_console = con;
	if (keep_early)
		early_console->flags &= ~CON_BOOT;
	else
		early_console->flags |= CON_BOOT;
	register_console(early_console);
}

static int __init setup_early_printk(char *buf)
{
	int keep;

	if (!buf)
		return 0;

	if (early_console)
		return 0;

	keep = (strstr(buf, "keep") != NULL);

	while (*buf != '\0') {
		if (!strncmp(buf, "serial", 6)) {
			buf += 6;
			early_serial_init(buf);
			early_console_register(&early_serial_console, keep);
			if (!strncmp(buf, ",ttyS", 5))
				buf += 5;
		}
		if (!strncmp(buf, "ttyS", 4)) {
			early_serial_init(buf + 4);
			early_console_register(&early_serial_console, keep);
		}
		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_register(&early_vga_console, keep);
		}
#ifdef CONFIG_EARLY_PRINTK_DBGP
		if (!strncmp(buf, "dbgp", 4) && !early_dbgp_init(buf + 4))
			early_console_register(&early_dbgp_console, keep);
#endif
#ifdef CONFIG_HVC_XEN
		if (!strncmp(buf, "xen", 3))
			early_console_register(&xenboot_console, keep);
#endif
#ifdef CONFIG_EARLY_PRINTK_INTEL_MID
		if (!strncmp(buf, "mrst", 4)) {
			mrst_early_console_init();
			early_console_register(&early_mrst_console, keep);
		}

		if (!strncmp(buf, "hsu", 3)) {
			hsu_early_console_init(buf + 3);
			early_console_register(&early_hsu_console, keep);
		}
#endif
#ifdef CONFIG_EARLY_PRINTK_EFI
		if (!strncmp(buf, "efi", 3))
			early_console_register(&early_efi_console, keep);
#endif

		buf++;
	}
	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>
5c05917e YL	6	#include <linux/usb/ch9.h>
	7	#include <linux/pci_regs.h>
	8	#include <linux/pci_ids.h>
	9	#include <linux/errno.h>
250c2277 TG	10	#include <asm/io.h>
	11	#include <asm/processor.h>
	12	#include <asm/fcntl.h>
30c82645	13	#include <asm/setup.h>
250c2277	14	#include <xen/hvc-console.h>
5c05917e	15	#include <asm/pci-direct.h>
5c05917e	16	#include <asm/fixmap.h>
05454c26	17	#include <asm/intel-mid.h>
726c0d95	18	#include <asm/pgtable.h>
5c05917e	19	#include <linux/usb/ehci_def.h>
72548e83 MF	20	#include <linux/efi.h>
72548e83 MF	21	#include <asm/efi.h>
1da177e4	22
250c2277	23	/* Simple VGA output */
250c2277 TG	24	#define VGABASE (__ISA_IO_base + 0xb8000)
	25
	26	static int max_ypos = 25, max_xpos = 80;
c9cf39ae	27	static int current_ypos = 25, current_xpos;
250c2277 TG	28
	29	static void early_vga_write(struct console con, const char str, unsigned n)
	30	{
	31	char c;
	32	int i, k, j;
	33
	34	while ((c = *str++) != '\0' && n-- > 0) {
	35	if (current_ypos >= max_ypos) {
	36	/* scroll 1 line up */
	37	for (k = 1, j = 0; k < max_ypos; k++, j++) {
	38	for (i = 0; i < max_xpos; i++) {
	39	writew(readw(VGABASE+2(max_xposk+i)),
	40	VGABASE + 2(max_xposj + i));
	41	}
	42	}
	43	for (i = 0; i < max_xpos; i++)
	44	writew(0x720, VGABASE + 2(max_xposj + i));
	45	current_ypos = max_ypos-1;
	46	}
61eaf539 JW	47	#ifdef CONFIG_KGDB_KDB
	48	if (c == '\b') {
	49	if (current_xpos > 0)
	50	current_xpos--;
	51	} else if (c == '\r') {
	52	current_xpos = 0;
	53	} else
	54	#endif
250c2277 TG	55	if (c == '\n') {
	56	current_xpos = 0;
	57	current_ypos++;
	58	} else if (c != '\r') {
	59	writew(((0x7 << 8) \| (unsigned short) c),
	60	VGABASE + 2(max_xposcurrent_ypos +
	61	current_xpos++));
	62	if (current_xpos >= max_xpos) {
	63	current_xpos = 0;
	64	current_ypos++;
	65	}
	66	}
	67	}
	68	}
	69
	70	static struct console early_vga_console = {
	71	.name = "earlyvga",
	72	.write = early_vga_write,
	73	.flags = CON_PRINTBUFFER,
	74	.index = -1,
	75	};
	76
	77	/* Serial functions loosely based on a similar package from Klaus P. Gerlicher */
	78
	79	static int early_serial_base = 0x3f8; /* ttyS0 */
	80
	81	#define XMTRDY 0x20
	82
	83	#define DLAB 0x80
	84
	85	#define TXR 0 /* Transmit register (WRITE) */
	86	#define RXR 0 /* Receive register (READ) */
	87	#define IER 1 /* Interrupt Enable */
	88	#define IIR 2 /* Interrupt ID */
	89	#define FCR 2 /* FIFO control */
	90	#define LCR 3 /* Line control */
	91	#define MCR 4 /* Modem control */
	92	#define LSR 5 /* Line Status */
	93	#define MSR 6 /* Modem Status */
	94	#define DLL 0 /* Divisor Latch Low */
	95	#define DLH 1 /* Divisor latch High */
	96
	97	static int early_serial_putc(unsigned char ch)
	98	{
	99	unsigned timeout = 0xffff;
5c05917e	100
250c2277 TG	101	while ((inb(early_serial_base + LSR) & XMTRDY) == 0 && --timeout)
	102	cpu_relax();
	103	outb(ch, early_serial_base + TXR);
	104	return timeout ? 0 : -1;
	105	}
	106
	107	static void early_serial_write(struct console con, const char s, unsigned n)
	108	{
	109	while (*s && n-- > 0) {
	110	if (*s == '\n')
	111	early_serial_putc('\r');
	112	early_serial_putc(*s);
	113	s++;
	114	}
	115	}
	116
	117	#define DEFAULT_BAUD 9600
	118
	119	static __init void early_serial_init(char *s)
	120	{
	121	unsigned char c;
	122	unsigned divisor;
	123	unsigned baud = DEFAULT_BAUD;
	124	char *e;
	125
	126	if (*s == ',')
	127	++s;
	128
	129	if (*s) {
	130	unsigned port;
e941f27a	131	if (!strncmp(s, "0x", 2)) {
250c2277 TG	132	early_serial_base = simple_strtoul(s, &e, 16);
250c2277 TG	133	} else {
30cec979	134	static const int __initconst bases[] = { 0x3f8, 0x2f8 };
250c2277	135
e941f27a	136	if (!strncmp(s, "ttyS", 4))
250c2277 TG	137	s += 4;
	138	port = simple_strtoul(s, &e, 10);
	139	if (port > 1 \|\| s == e)
	140	port = 0;
	141	early_serial_base = bases[port];
	142	}
	143	s += strcspn(s, ",");
	144	if (*s == ',')
	145	s++;
	146	}
	147
	148	outb(0x3, early_serial_base + LCR); /* 8n1 */
	149	outb(0, early_serial_base + IER); /* no interrupt */
	150	outb(0, early_serial_base + FCR); /* no fifo */
	151	outb(0x3, early_serial_base + MCR); /* DTR + RTS */
	152
	153	if (*s) {
	154	baud = simple_strtoul(s, &e, 0);
	155	if (baud == 0 \|\| s == e)
	156	baud = DEFAULT_BAUD;
	157	}
	158
	159	divisor = 115200 / baud;
	160	c = inb(early_serial_base + LCR);
	161	outb(c \| DLAB, early_serial_base + LCR);
	162	outb(divisor & 0xff, early_serial_base + DLL);
	163	outb((divisor >> 8) & 0xff, early_serial_base + DLH);
	164	outb(c & ~DLAB, early_serial_base + LCR);
	165	}
	166
	167	static struct console early_serial_console = {
	168	.name = "earlyser",
	169	.write = early_serial_write,
	170	.flags = CON_PRINTBUFFER,
	171	.index = -1,
	172	};
	173
c9530948 JW	174	static inline void early_console_register(struct console *con, int keep_early)
c9530948 JW	175	{
d0380e6c	176	if (con->index != -1) {
429a6e5e JW	177	printk(KERN_CRIT "ERROR: earlyprintk= %s already used\n",
	178	con->name);
	179	return;
	180	}
c9530948 JW	181	early_console = con;
	182	if (keep_early)
	183	early_console->flags &= ~CON_BOOT;
	184	else
	185	early_console->flags \|= CON_BOOT;
	186	register_console(early_console);
	187	}
250c2277 TG	188
	189	static int __init setup_early_printk(char *buf)
	190	{
c9530948	191	int keep;
5c05917e	192
250c2277 TG	193	if (!buf)
	194	return 0;
	195
d0380e6c	196	if (early_console)
250c2277	197	return 0;
250c2277	198
c9530948 JW	199	keep = (strstr(buf, "keep") != NULL);
	200
	201	while (*buf != '\0') {
	202	if (!strncmp(buf, "serial", 6)) {
ea3acb19 JW	203	buf += 6;
ea3acb19 JW	204	early_serial_init(buf);
c9530948	205	early_console_register(&early_serial_console, keep);
ea3acb19 JW	206	if (!strncmp(buf, ",ttyS", 5))
ea3acb19 JW	207	buf += 5;
c9530948 JW	208	}
	209	if (!strncmp(buf, "ttyS", 4)) {
	210	early_serial_init(buf + 4);
	211	early_console_register(&early_serial_console, keep);
	212	}
	213	if (!strncmp(buf, "vga", 3) &&
	214	boot_params.screen_info.orig_video_isVGA == 1) {
	215	max_xpos = boot_params.screen_info.orig_video_cols;
	216	max_ypos = boot_params.screen_info.orig_video_lines;
	217	current_ypos = boot_params.screen_info.orig_y;
	218	early_console_register(&early_vga_console, keep);
	219	}
5c05917e	220	#ifdef CONFIG_EARLY_PRINTK_DBGP
c9530948 JW	221	if (!strncmp(buf, "dbgp", 4) && !early_dbgp_init(buf + 4))
c9530948 JW	222	early_console_register(&early_dbgp_console, keep);
5c05917e	223	#endif
250c2277	224	#ifdef CONFIG_HVC_XEN
c9530948 JW	225	if (!strncmp(buf, "xen", 3))
c9530948 JW	226	early_console_register(&xenboot_console, keep);
c20b5c33	227	#endif
1ea7c673	228	#ifdef CONFIG_EARLY_PRINTK_INTEL_MID
c20b5c33 FT	229	if (!strncmp(buf, "mrst", 4)) {
	230	mrst_early_console_init();
	231	early_console_register(&early_mrst_console, keep);
	232	}
4d033556 FT	233
4d033556 FT	234	if (!strncmp(buf, "hsu", 3)) {
b82e324b	235	hsu_early_console_init(buf + 3);
4d033556 FT	236	early_console_register(&early_hsu_console, keep);
4d033556 FT	237	}
250c2277	238	#endif
72548e83 MF	239	#ifdef CONFIG_EARLY_PRINTK_EFI
	240	if (!strncmp(buf, "efi", 3))
	241	early_console_register(&early_efi_console, keep);
	242	#endif
	243
c9530948	244	buf++;
250c2277	245	}
250c2277 TG	246	return 0;
250c2277 TG	247	}
5c05917e	248
250c2277	249	early_param("earlyprintk", setup_early_printk);