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From 38f3f1c0902e344a92a7a8994cd25c13b544b7e9 Mon Sep 17 00:00:00 2001
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From: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com>
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Date: Sat, 27 Apr 2013 22:47:57 +0200
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Subject: [PATCH 368/482] * grub-core/term/ns8250.c: Systematically
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probe ports by writing to SR before using them.
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---
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ChangeLog | 5 +++++
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grub-core/term/ns8250.c | 46 +++++++++++++++++++++++++++++++++++++++++++---
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2 files changed, 48 insertions(+), 3 deletions(-)
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diff --git a/ChangeLog b/ChangeLog
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index 83cdafc..43b2906 100644
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--- a/ChangeLog
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+++ b/ChangeLog
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@@ -1,3 +1,8 @@
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+2013-04-27 Vladimir Serbinenko <phcoder@gmail.com>
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+
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+ * grub-core/term/ns8250.c: Systematically probe ports by writing
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+ to SR before using them.
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+
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2013-04-27 Paulo Flabiano Smorigo <pfsmorigo@br.ibm.com>
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* util/ieee1275/ofpath.c (of_path_of_scsi): Fix path output for sas
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diff --git a/grub-core/term/ns8250.c b/grub-core/term/ns8250.c
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index e6947f5..2064e0d 100644
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--- a/grub-core/term/ns8250.c
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+++ b/grub-core/term/ns8250.c
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@@ -36,6 +36,8 @@ static const grub_port_t serial_hw_io_addr[] = GRUB_MACHINE_SERIAL_PORTS;
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#define GRUB_SERIAL_PORT_NUM (ARRAY_SIZE(serial_hw_io_addr))
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#endif
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+static int dead_ports = 0;
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+
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/* Convert speed to divisor. */
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static unsigned short
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serial_get_divisor (const struct grub_serial_port *port __attribute__ ((unused)),
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@@ -83,6 +85,8 @@ do_real_config (struct grub_serial_port *port)
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{
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int divisor;
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unsigned char status = 0;
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+ grub_uint64_t endtime;
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+
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const unsigned char parities[] = {
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[GRUB_SERIAL_PARITY_NONE] = UART_NO_PARITY,
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[GRUB_SERIAL_PARITY_ODD] = UART_ODD_PARITY,
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@@ -132,8 +136,16 @@ do_real_config (struct grub_serial_port *port)
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#endif
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/* Drain the input buffer. */
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+ endtime = grub_get_time_ms () + 1000;
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while (grub_inb (port->port + UART_LSR) & UART_DATA_READY)
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- grub_inb (port->port + UART_RX);
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+ {
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+ grub_inb (port->port + UART_RX);
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+ if (grub_get_time_ms () > endtime)
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+ {
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+ port->broken = 1;
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+ break;
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+ }
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+ }
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port->configured = 1;
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}
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@@ -239,6 +251,20 @@ grub_ns8250_init (void)
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if (serial_hw_io_addr[i])
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{
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grub_err_t err;
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+
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+ grub_outb (0x5a, serial_hw_io_addr[i] + UART_SR);
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+ if (grub_inb (serial_hw_io_addr[i] + UART_SR) != 0x5a)
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+ {
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+ dead_ports |= (1 << i);
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+ continue;
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+ }
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+ grub_outb (0xa5, serial_hw_io_addr[i] + UART_SR);
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+ if (grub_inb (serial_hw_io_addr[i] + UART_SR) != 0xa5)
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+ {
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+ dead_ports |= (1 << i);
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+ continue;
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+ }
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+
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grub_snprintf (com_names[i], sizeof (com_names[i]), "com%d", i);
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com_ports[i].name = com_names[i];
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com_ports[i].driver = &grub_ns8250_driver;
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@@ -255,7 +281,8 @@ grub_ns8250_init (void)
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grub_port_t
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grub_ns8250_hw_get_port (const unsigned int unit)
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{
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- if (unit < GRUB_SERIAL_PORT_NUM)
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+ if (unit < GRUB_SERIAL_PORT_NUM
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+ && !(dead_ports & (1 << unit)))
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return serial_hw_io_addr[unit];
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else
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return 0;
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@@ -268,7 +295,20 @@ grub_serial_ns8250_add_port (grub_port_t port)
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unsigned i;
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for (i = 0; i < GRUB_SERIAL_PORT_NUM; i++)
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if (com_ports[i].port == port)
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- return com_names[i];
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+ {
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+ if (dead_ports & (1 << i))
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+ return NULL;
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+ return com_names[i];
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+ }
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+
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+ grub_outb (0x5a, port + UART_SR);
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+ if (grub_inb (port + UART_SR) != 0x5a)
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+ return NULL;
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+
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+ grub_outb (0xa5, port + UART_SR);
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+ if (grub_inb (port + UART_SR) != 0xa5)
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+ return NULL;
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+
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p = grub_malloc (sizeof (*p));
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if (!p)
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return NULL;
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--
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1.8.2.1
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