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authorDave Frodin <dave.frodin@se-eng.com>2012-12-15 13:24:02 -0700
committerAnton Kochkov <anton.kochkov@gmail.com>2012-12-18 19:59:59 +0100
commit5056b6e612569b202c96a8a54da90879f118b7d5 (patch)
tree838042e8fd30316ddb32bd5110973d424b5cf181 /payloads/libpayload/drivers
parent6bf11cf50c2b682f8c09a53af774588123b250b6 (diff)
downloadcoreboot-5056b6e612569b202c96a8a54da90879f118b7d5.tar.xz
libpayload: Check if serial console h/w is present before using
The serial_io_havechar() and serial_io_getchar() functions will always see keystrokes available if the serial hardware isn't actually there. We will still output chars to non-existant hardware to allow virtual hardware to capture them. Change-Id: I04e85157b6b7a185448abab352b5417a798a397a Signed-off-by: Dave Frodin <dave.frodin@se-eng.com> Reviewed-on: http://review.coreboot.org/2040 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <patrick@georgi-clan.de> Reviewed-by: Anton Kochkov <anton.kochkov@gmail.com>
Diffstat (limited to 'payloads/libpayload/drivers')
-rw-r--r--payloads/libpayload/drivers/serial.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/serial.c b/payloads/libpayload/drivers/serial.c
index c0200af00c..cd00a13204 100644
--- a/payloads/libpayload/drivers/serial.c
+++ b/payloads/libpayload/drivers/serial.c
@@ -35,6 +35,8 @@
#define MEMBASE (phys_to_virt(lib_sysinfo.serial->baseaddr))
#define DIVISOR(x) (115200 / x)
+static int serial_io_hardware_is_present = 1;
+
#ifdef CONFIG_SERIAL_SET_SPEED
static void serial_io_hardware_init(int port, int speed, int word_bits, int parity, int stop_bits)
{
@@ -107,6 +109,12 @@ void serial_init(void)
#endif
console_add_input_driver(&consin);
console_add_output_driver(&consout);
+
+ /* check to see if there's actually serial port h/w */
+ if (lib_sysinfo.ser_ioport) {
+ if( (inb(IOBASE + 0x05)==0xFF) && (inb(IOBASE + 0x06)==0xFF) )
+ serial_io_hardware_is_present = 0;
+ }
}
static void serial_io_putchar(unsigned int c)
@@ -118,11 +126,15 @@ static void serial_io_putchar(unsigned int c)
static int serial_io_havechar(void)
{
+ if ( !serial_io_hardware_is_present )
+ return 0;
return inb(IOBASE + 0x05) & 0x01;
}
static int serial_io_getchar(void)
{
+ if ( !serial_io_hardware_is_present )
+ return -1;
while (!serial_io_havechar()) ;
return (int)inb(IOBASE);
}