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, "mrfld", 5)) {
mrfld_early_console_init();
early_console_register(&early_mrfld_console, keep);
}
if (!strncmp(buf, "hsu", 3)) {
hsu_early_console_init(buf + 3);
early_console_register(&early_hsu_console, keep);
}
if (!strncmp(buf, "pti", 3))
early_console_register(&early_pti_console, keep);
#endif
buf++;
}
return 0;
}
static void parse_console_uart8250(void)
{
char optstr[64], *options;
int baud = DEFAULT_BAUD;
int port = 0;
/*
* console=uart8250,io,0x3f8,115200n8
* need to make sure it is last one console !
*/
if (cmdline_find_option("console", optstr, sizeof optstr) <= 0)
return;
options = optstr;
if (!strncmp(options, "uart8250,io,", 12))
port = simple_strtoull(options + 12, &options, 0);
else if (!strncmp(options, "uart,io,", 8))
port = simple_strtoull(options + 8, &options, 0);
else
return;
if (options && (options[0] == ','))
baud = simple_strtoull(options + 1, &options, 0);
else
baud = probe_baud(port);
if (port)
early_serial_init(port, baud);
}
static void parse_earlyprintk(void)
{
int baud = DEFAULT_BAUD;
char arg[32];
int pos = 0;
int port = 0;
if (cmdline_find_option("earlyprintk", arg, sizeof arg) > 0) {
char *e;
if (!strncmp(arg, "serial", 6)) {
port = DEFAULT_SERIAL_PORT;
pos += 6;
}
if (arg[pos] == ',')
pos++;
/*
* make sure we have
* "serial,0x3f8,115200"
* "serial,ttyS0,115200"
* "ttyS0,115200"
*/
if (pos == 7 && !strncmp(arg + pos, "0x", 2)) {
port = simple_strtoull(arg + pos, &e, 16);
if (port == 0 || arg + pos == e)
port = DEFAULT_SERIAL_PORT;
else
pos = e - arg;
} else if (!strncmp(arg + pos, "ttyS", 4)) {
static const int bases[] = { 0x3f8, 0x2f8 };
int idx = 0;
if (!strncmp(arg + pos, "ttyS", 4))
pos += 4;
if (arg[pos++] == '1')
idx = 1;
port = bases[idx];
}
if (arg[pos] == ',')
pos++;
baud = simple_strtoull(arg + pos, &e, 0);
if (baud == 0 || arg + pos == e)
baud = DEFAULT_BAUD;
}
if (port)
early_serial_init(port, baud);
}
