Author: delphij
Date: Sat Jun 11 01:19:19 2011
New Revision: 222967
URL: http://svn.freebsd.org/changeset/base/222967
Log:
Add comments about the validation.
Modified:
head/sys/dev/atkbdc/atkbd.c
Modified: head/sys/dev/atkbdc/atkbd.c
==============================================================================
--- head/sys/dev/atkbdc/atkbd.c Sat Jun 11 00:31:37 2011 (r222966)
+++ head/sys/dev/atkbdc/atkbd.c Sat Jun 11 01:19:19 2011 (r222967)
@@ -1097,6 +1097,15 @@ get_typematic(keyboard_t *kbd)
x86regs_t regs;
uint8_t *p;
+ /*
+ * Traditional entry points of int 0x15 and 0x16 are fixed
+ * and later BIOSes follow them. (U)EFI CSM specification
+ * also mandate these fixed entry points.
+ *
+ * Validate the entry points here before we proceed further.
+ * It's known that some recent laptops does not have the
+ * same entry point and hang on boot if we call it.
+ */
if (x86bios_get_intr(0x15) != 0xf000f859 ||
x86bios_get_intr(0x16) != 0xf000e82e)
return (ENODEV);
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