add helper functions for reading and writing CMOS entries
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1 changed files with 29 additions and 0 deletions
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@ -32,6 +32,13 @@
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extern "C" {
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#endif
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#ifndef CMOS_PORT_ADDRESS
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#define CMOS_PORT_ADDRESS 0x70
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#endif
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#ifndef CMOS_PORT_DATA
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#define CMOS_PORT_DATA 0x71
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#endif
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/** @brief Read a byte from an IO port
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*
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* @param _port The port you want to read from
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@ -98,6 +105,28 @@ inline static void uart_putchar(unsigned char _data)
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outportb(0x2F8, _data);
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}
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/**
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* read a byte from CMOS
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* @param offset CMOS offset
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* @return value you want to read
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*/
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inline static uint8_t cmos_read(uint8_t offset)
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{
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outportb(CMOS_PORT_ADDRESS, offset);
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return inportb(CMOS_PORT_DATA);
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}
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/**
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* write a byte in CMOS
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* @param offset CMOS offset
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* @param val the value you want wto write
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*/
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inline static void cmos_write(uint8_t offset, uint8_t val)
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{
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outportb(CMOS_PORT_ADDRESS, offset);
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outportb(CMOS_PORT_DATA, val);
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}
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#ifdef __cplusplus
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}
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#endif
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