From: Marc Jones <marc.jo...@se-eng.com>
Date: Wed, 24 Sep 2014 15:14:41 -0600
Some devices don’t have legacy interrupt support, but still need to use
a legacy keyboard. This patch adds a KBC check and manual call to the
keyboard service if there is a key waiting in the KBC.
BUG=chrome-os-partner:30836
BRANCH=None
TEST=Build and boot Rambi SeaBIOS.
Change-Id: I11033d29ec26b5a772588a0aa1a35678ab05a462
Signed-off-by: Marc Jones <marc.jo...@se-eng.com>
Reviewed-on: https://chromium-review.googlesource.com/219803
Reviewed-by: Mike Loptien <mike.lopt...@se-eng.com>
Tested-by: Mike Loptien <mike.lopt...@se-eng.com>
Reviewed-by: Duncan Laurie <dlau...@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/227501
Commit-Queue: Stefan Reinauer <reina...@chromium.org>
Tested-by: Stefan Reinauer <reina...@chromium.org>
Signed-off-by: Paul Menzel <pmen...@molgen.mpg.de>
---
src/Kconfig | 5 +++++
src/boot.c | 3 +++
src/kbd.c | 12 ++++++++++++
3 files changed, 20 insertions(+)
diff --git a/src/Kconfig b/src/Kconfig
index 6606ce4..d389ede 100644
--- a/src/Kconfig
+++ b/src/Kconfig
@@ -440,6 +440,11 @@ menu "BIOS interfaces"
default y
help
Support for int15c2 mouse calls.
+ config KBC_POLL
+ bool "Poll the keyboad controller for keys"
+ default n
+ help
+ Poll for keys when interrupts are not available.
config S3_RESUME
bool "S3 resume"
diff --git a/src/boot.c b/src/boot.c
index afeb36a..3beecee 100644
--- a/src/boot.c
+++ b/src/boot.c
@@ -631,7 +631,10 @@ get_keystroke_full(int msec)
return get_raw_keystroke();
if (irqtimer_check(end))
return -1;
+ if (!CONFIG_KBC_POLL)
yield_toirq();
+ else
+ msleep(5);
}
}
diff --git a/src/kbd.c b/src/kbd.c
index 3f08d32..5726274 100644
--- a/src/kbd.c
+++ b/src/kbd.c
@@ -252,6 +252,18 @@ handle_16(struct bregs *regs)
// XXX - set_leds should be called from irq handler
set_leds();
+ // If interrupts are not enabled do KBC polling.
+ // Check the KBC for a key on every keyboard service function (INT16).
+ // If interrupts are working the KBC status port should always be
empty.
+ // (Yes, there is a race condition, but it is recoverable).
+ if (CONFIG_PS2PORT && CONFIG_KBC_POLL) {
+ u8 v = inb(PORT_PS2_STATUS);
+ if ((v & I8042_STR_OBF) && !(v & I8042_STR_AUXDATA)) {
+ v = inb(PORT_PS2_DATA);
+ process_key(v);
+ }
+ }
+
switch (regs->ah) {
case 0x00: handle_1600(regs); break;
case 0x01: handle_1601(regs); break;
--
2.25.1
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