57 lines
1.4 KiB
C++
57 lines
1.4 KiB
C++
/**
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* PROJECT: ExectOS
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* COPYRIGHT: See COPYING.md in the top level directory
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* FILE: xtoskrnl/hl/x86/firmware.cc
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* DESCRIPTION: UEFI/BIOS Firmware support
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* DEVELOPERS: Aiken Harris <harraiken91@gmail.com>
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*/
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#include <xtos.hh>
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/**
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* Reads a byte from the specified CMOS register.
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*
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* @param Register
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* Supplies the CMOS register index to read from.
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*
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* @return This routine returns the data read from the register.
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*
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* @since XT 1.0
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*/
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XTFASTCALL
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UCHAR
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HL::Firmware::ReadCmosRegister(IN UCHAR Register)
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{
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/* Select the register (Setting the highest bit disables NMI) */
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HL::IoPort::WritePort8(CMOS_SELECT_PORT, Register | CMOS_NMI_SELECT);
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/* Read value from the data port */
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return HL::IoPort::ReadPort8(CMOS_DATA_PORT);
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}
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/**
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* Writes a byte to the specified CMOS register.
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*
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* @param Register
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* Supplies the CMOS register index to write to.
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*
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* @param Value
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* Supplies the value to write to the register.
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*
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* @return This routine does not return any value.
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*
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* @since XT 1.0
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*/
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XTFASTCALL
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VOID
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HL::Firmware::WriteCmosRegister(IN UCHAR Register,
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IN UCHAR Value)
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{
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/* Select the register (Setting the highest bit disables NMI) */
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HL::IoPort::WritePort8(CMOS_SELECT_PORT, Register | CMOS_NMI_SELECT);
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/* Write the provided value to the data port */
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HL::IoPort::WritePort8(CMOS_DATA_PORT, Value);
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}
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