30 lines
1.1 KiB
C
30 lines
1.1 KiB
C
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/* See COPYRIGHT for copyright information. */
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#ifndef JOS_KERN_KCLOCK_H
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#define JOS_KERN_KCLOCK_H
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#ifndef JOS_KERNEL
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# error "This is a JOS kernel header; user programs should not #include it"
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#endif
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#define IO_RTC 0x070 /* RTC port */
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#define MC_NVRAM_START 0xe /* start of NVRAM: offset 14 */
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#define MC_NVRAM_SIZE 50 /* 50 bytes of NVRAM */
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/* NVRAM bytes 7 & 8: base memory size */
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#define NVRAM_BASELO (MC_NVRAM_START + 7) /* low byte; RTC off. 0x15 */
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#define NVRAM_BASEHI (MC_NVRAM_START + 8) /* high byte; RTC off. 0x16 */
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/* NVRAM bytes 9 & 10: extended memory size (between 1MB and 16MB) */
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#define NVRAM_EXTLO (MC_NVRAM_START + 9) /* low byte; RTC off. 0x17 */
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#define NVRAM_EXTHI (MC_NVRAM_START + 10) /* high byte; RTC off. 0x18 */
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/* NVRAM bytes 38 and 39: extended memory size (between 16MB and 4G) */
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#define NVRAM_EXT16LO (MC_NVRAM_START + 38) /* low byte; RTC off. 0x34 */
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#define NVRAM_EXT16HI (MC_NVRAM_START + 39) /* high byte; RTC off. 0x35 */
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unsigned mc146818_read(unsigned reg);
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void mc146818_write(unsigned reg, unsigned datum);
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#endif // !JOS_KERN_KCLOCK_H
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