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Use the century register when available

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This commit is contained in:
Baptiste Wicht 2016-07-24 15:08:55 +02:00
parent eaf912b079
commit c7a0a2ee19
1 changed files with 32 additions and 7 deletions
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39
kernel/src/rtc.cpp
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@ -7,9 +7,14 @@
#include "rtc.hpp"
#include "kernel_utils.hpp"
#include "acpi.hpp"
#include "acpica.hpp"
#include "logging.hpp"
namespace {
constexpr const size_t FADT2_REVISION_ID = 3;
#define CURRENT_YEAR 2013
#define cmos_address 0x70
#define cmos_data 0x71
@ -33,6 +38,7 @@ datetime rtc::all_data(){
uint8_t day;
uint8_t month;
uint8_t year;
uint8_t century = 0x0;
uint8_t last_second;
uint8_t last_minute;
@ -40,11 +46,14 @@ datetime rtc::all_data(){
uint8_t last_day;
uint8_t last_month;
uint8_t last_year;
uint8_t last_century;
uint8_t registerB;
//TODO When ACPI gets supported, get the address
//of the century register and use it to make
//better year calculation
int century_register = 0x0;
if (acpi::initialized() && AcpiGbl_FADT.Header.Revision >= FADT2_REVISION_ID && AcpiGbl_FADT.Century){
century_register = AcpiGbl_FADT.Century;
}
while (get_update_in_progress_flag()){}; // Make sure an update isn't in progress
@ -55,6 +64,10 @@ datetime rtc::all_data(){
month = get_RTC_register(0x08);
year = get_RTC_register(0x09);
if(century_register){
century = get_RTC_register(century_register);
}
do {
last_second = second;
last_minute = minute;
@ -62,6 +75,7 @@ datetime rtc::all_data(){
last_day = day;
last_month = month;
last_year = year;
last_century = century;
while (get_update_in_progress_flag()){}; // Make sure an update isn't in progress
@ -71,8 +85,12 @@ datetime rtc::all_data(){
day = get_RTC_register(0x07);
month = get_RTC_register(0x08);
year = get_RTC_register(0x09);
if(century_register){
century = get_RTC_register(century_register);
}
} while( (last_second != second) || (last_minute != minute) || (last_hour != hour) ||
(last_day != day) || (last_month != month) || (last_year != year) );
(last_day != day) || (last_month != month) || (last_year != year) || (last_century != century));
registerB = get_RTC_register(0x0B);
@ -85,6 +103,7 @@ datetime rtc::all_data(){
day = (day & 0x0F) + ((day / 16) * 10);
month = (month & 0x0F) + ((month / 16) * 10);
year = (year & 0x0F) + ((year / 16) * 10);
century = (century & 0x0F) + ((century / 16) * 10);
}
// Convert 12 hour clock to 24 hour clock if necessary
@ -95,9 +114,15 @@ datetime rtc::all_data(){
// Calculate the full (4-digit) year
uint16_t full_year = year + (CURRENT_YEAR / 100) * 100;
if(full_year < CURRENT_YEAR){
full_year += 100;
uint16_t full_year;
if(century_register){
full_year = year + century * 100;
} else {
full_year = year + (CURRENT_YEAR / 100) * 100;
if(full_year < CURRENT_YEAR){
full_year += 100;
}
}
return {full_year, month, day, hour, minute, second, 0, 0};