81 lines
4.0 KiB
C
81 lines
4.0 KiB
C
/***** cmos.c ********************************************************
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* (c) 2010 CTA Systems Inc. All rights reserved. Glory To God *
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* *
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* CMOS I/O Routines *
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* ================= *
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* *
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* ! IMPORTANT NOTE ! Close interrupts before any CMOS operation *
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************************************************************ cta os */
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#include <system.h>
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#include <time.h>
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#include "cmos.h"
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/*****************************************************************
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* !!!!!!!!!! IMPORTANT NOTE !!!!!!!!!! *
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* You should close interrupts before any CMOS operation. *
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*****************************************************************/
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inline unsigned char i86_cmos_read (unsigned char address)
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{
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outportb(0x70, address); iowait();
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return inportb(0x71);
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}
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inline void i86_cmos_write (unsigned char address, unsigned char val)
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{
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outportb(0x70, address); iowait();
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outportb(0x71, val);
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}
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void i86_cmos_write_clock (const TIME* time)
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{
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unsigned char BCD = ((i86_cmos_read(0x0b)&4)==0) ? 1 : 0;
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unsigned char ampm = ((i86_cmos_read(0x0b)&2)==0) ? 1 : 0;
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i86_cmos_write (0, (BCD) ? (time->second%10) | (time->second/10*16) : time->second); // Seconds
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i86_cmos_write (2, (BCD) ? (time->minute%10) | (time->minute/10*16) : time->minute); // Minutes
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if (ampm && time->hour > 12) // Hours
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i86_cmos_write (4, (BCD) ? (((time->hour - 12) % 10) | ((time->hour - 12)/10*16) | 0x80) : (time->hour | 0x80) );
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else if (ampm && time->hour == 0) // Midnight convention: 12 PM = 00:00
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i86_cmos_write (4, (BCD) ? 0x92 : 0x8C);
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else i86_cmos_write (4, (BCD) ? (time->hour%10) | (time->hour/10*16) : time->hour); // 24h / AM
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i86_cmos_write (6, (BCD) ? (time->weekday%10) | (time->weekday/10*16) : time->weekday); // Weekday
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i86_cmos_write (7, (BCD) ? (time->day%10) | (time->day/10*16) : time->day); // Day
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i86_cmos_write (8, (BCD) ? (time->month%10) | (time->month/10*16) : time->month); // Month
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i86_cmos_write (9, (BCD) ? (time->year%10) | (time->year/10*16) : time->year); // Year
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i86_cmos_write (0x32, (BCD) ? (time->century%10) | (time->century/10*16) : time->century); // Century
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}
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void i86_cmos_read_clock(TIME* tim)
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{
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unsigned char BCD = ((i86_cmos_read(0x0b)&4)==0) ? 1 : 0;
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unsigned char am_pm = ((i86_cmos_read(0x0b)&2)==0) ? 1 : 0;
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tim->second = (BCD) ? (i86_cmos_read(0x00)%16) + 10*(i86_cmos_read(0x00)/16): i86_cmos_read(0x00);
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tim->minute = (BCD) ? (i86_cmos_read(0x02)%16) + 10*(i86_cmos_read(0x02)/16): i86_cmos_read(0x02);
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// Time is PM
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if (am_pm && i86_cmos_read(0x04)&80) {
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tim->hour = (BCD) ? ((i86_cmos_read(0x04)-0x80)%16) + 10*((i86_cmos_read(0x04)-0x80)/16): i86_cmos_read(0x04)-0x80;
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tim->hour += 12;
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}
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// 24Hour format, or AM
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else tim->hour = (BCD) ? (i86_cmos_read(0x04)%16) + 10*(i86_cmos_read(0x04)/16): i86_cmos_read(0x04);
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tim->weekday = (BCD) ? (i86_cmos_read(0x06)%16) + 10*(i86_cmos_read(0x06)/16): i86_cmos_read(0x06);
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tim->day = (BCD) ? (i86_cmos_read(0x07)%16) + 10*(i86_cmos_read(0x07)/16): i86_cmos_read(0x07);
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tim->month = (BCD) ? (i86_cmos_read(0x08)%16) + 10*(i86_cmos_read(0x08)/16): i86_cmos_read(0x08);
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tim->year = (BCD) ? (i86_cmos_read(0x09)%16) + 10*(i86_cmos_read(0x09)/16): i86_cmos_read(0x09);
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tim->century = (BCD) ? (i86_cmos_read(0x32)%16) + 10*(i86_cmos_read(0x32)/16): i86_cmos_read(0x32);
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}
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unsigned char i86_cmos_read_floppy_drives ()
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{
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outportb (0x70, 0x10);
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return inportb(0x71);
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} |