Add comments about the validation.
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=222967
@ -1097,6 +1097,15 @@ get_typematic(keyboard_t *kbd)
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x86regs_t regs;
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uint8_t *p;
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/*
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* Traditional entry points of int 0x15 and 0x16 are fixed
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* and later BIOSes follow them. (U)EFI CSM specification
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* also mandate these fixed entry points.
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*
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* Validate the entry points here before we proceed further.
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* It's known that some recent laptops does not have the
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* same entry point and hang on boot if we call it.
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*/
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if (x86bios_get_intr(0x15) != 0xf000f859 ||
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x86bios_get_intr(0x16) != 0xf000e82e)
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return (ENODEV);
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