Date: Sat, 11 Jun 2011 01:19:19 +0000 (UTC) From: Xin LI <delphij@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r222967 - head/sys/dev/atkbdc Message-ID: <201106110119.p5B1JJP9051645@svn.freebsd.org>
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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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