#endif
-
-
-
#define NVRAM_REG_PORT 0x70
#define NVRAM_DATA_PORT 0x71
+#define NVRAM_RTC_IRQ 0x8
typedef enum {NVRAM_READY, NVRAM_REG_POSTED} nvram_state_t;
nvram_state_t dev_state;
uchar_t thereg;
uchar_t mem_state[NVRAM_REG_MAX];
+
+ uint_t us; //microseconds - for clock update - zeroed every second
+ uint_t pus; //microseconds - for periodic interrupt - cleared every period
};
+struct rtc_stata {
+ uint_t rate: 4; // clock rate = 65536Hz / 2 rate (0110=1024 Hz)
+ uint_t basis: 3; // time base, 010 = 32,768 Hz
+ uint_t uip: 1; // 1=update in progress
+} __attribute__((__packed__)) __attribute__((__aligned__ (1))) ;
+
+struct rtc_statb {
+ uint_t sum: 1; // 1=summer (daylight savings)
+ uint_t h24: 1; // 1=24h clock
+ uint_t dm: 1; // 1=date/time is in bcd, 0=binary
+ uint_t rec: 1; // 1=rectangular signal
+ uint_t ui: 1; // 1=update interrupt
+ uint_t ai: 1; // 1=alarm interrupt
+ uint_t pi: 1; // 1=periodic interrupt
+ uint_t set: 1; // 1=blocked update
+} __attribute__((__packed__)) __attribute__((__aligned__ (1))) ;
+
+struct rtc_statc {
+ uint_t res: 4; // reserved
+ uint_t uf: 1; // 1=source of interrupt is update
+ uint_t af: 1; // 1=source of interrupt is alarm interrupt
+ uint_t pf: 1; // 1=source of interrupt is periodic interrupt
+ uint_t irq: 1; // 1=interrupt requested
+} __attribute__((__packed__)) __attribute__((__aligned__ (1))) ;
+
+struct rtc_statd {
+ uint_t res: 7; // reserved
+ uint_t val: 1; // 1=cmos ram data is OK
+} __attribute__((__packed__)) __attribute__((__aligned__ (1))) ;
+
+
+
+
+struct vm_device *thedev=NULL;
+
+
+static struct vm_device *demultiplex_timer_interrupt(uint_t period_us)
+{
+ // hack
+ return thedev;
+}
+
+struct bcd_num {
+ uchar_t bot:4;
+ uchar_t top:4;
+} ;
+
+static uchar_t add_to(uchar_t *left, uchar_t *right, uchar_t bcd)
+{
+ uchar_t temp;
+
+ if (bcd) {
+ struct bcd_num *bl = (struct bcd_num *)left;
+ struct bcd_num *br = (struct bcd_num *)right;
+ uchar_t carry=0;
+
+ bl->bot += br->bot;
+ carry = bl->bot / 0xa;
+ bl->bot %= 0xa;
+ bl->top += carry + br->top;
+ carry = bl->top / 0xa;
+ bl->top %= 0xa;
+ return carry;
+ } else {
+ temp=*left;
+ *left+=*right;
+ if (*left<temp) {
+ return 1;
+ } else {
+ return 0;
+ }
+ }
+
+}
+
+
+static uchar_t days_in_month(struct vm_device *dev, uchar_t month, uchar_t bcd)
+{
+ // This completely ignores Julian / Gregorian stuff right now
+
+ if (bcd) {
+ switch (month) {
+ case 0x1: //jan
+ case 0x3: //march
+ case 0x5: //may
+ case 0x7: //july
+ case 0x8: //aug
+ case 0x10: //oct
+ case 0x12: //dec
+ return 0x31;
+ break;
+ case 0x4: //april
+ case 0x6: //june
+ case 0x9: //sept
+ case 0x11: //nov
+ return 0x30;
+ break;
+ case 0x2: //feb
+ return 0x28;
+ break;
+ default:
+ return 0x30;
+ }
+ } else {
+ switch (month) {
+ case 1: //jan
+ case 3: //march
+ case 5: //may
+ case 7: //july
+ case 8: //aug
+ case 10: //oct
+ case 12: //dec
+ return 31;
+ break;
+ case 4: //april
+ case 6: //june
+ case 9: //sept
+ case 11: //nov
+ return 30;
+ break;
+ case 2: //feb
+ return 28;
+ break;
+ default:
+ return 30;
+ }
+ }
+}
+
+
+static void update_time(struct vm_device *dev, uint_t period_us)
+{
+ struct nvram_internal *data = (struct nvram_internal *) (dev->private_data);
+ struct rtc_stata *stata = (struct rtc_stata *) &((data->mem_state[NVRAM_REG_STAT_A]));
+ struct rtc_statb *statb = (struct rtc_statb *) &((data->mem_state[NVRAM_REG_STAT_B]));
+ struct rtc_statc *statc = (struct rtc_statc *) &((data->mem_state[NVRAM_REG_STAT_C]));
+ //struct rtc_statd *statd = (struct rtc_statd *) &((data->mem_state[NVRAM_REG_STAT_D]));
+ uchar_t *sec = (uchar_t *) &(data->mem_state[NVRAM_REG_SEC]);
+ uchar_t *min = (uchar_t *) &(data->mem_state[NVRAM_REG_MIN]);
+ uchar_t *hour = (uchar_t *) &(data->mem_state[NVRAM_REG_HOUR]);
+ uchar_t *weekday = (uchar_t *) &(data->mem_state[NVRAM_REG_WEEK_DAY]);
+ uchar_t *monthday = (uchar_t *) &(data->mem_state[NVRAM_REG_MONTH_DAY]);
+ uchar_t *month = (uchar_t *) &(data->mem_state[NVRAM_REG_MONTH]);
+ uchar_t *year = (uchar_t *) &(data->mem_state[NVRAM_REG_YEAR]);
+ uchar_t *cent = (uchar_t *) &(data->mem_state[NVRAM_REG_IBM_CENTURY_BYTE]);
+ uchar_t *seca = (uchar_t *) &(data->mem_state[NVRAM_REG_SEC_ALARM]);
+ uchar_t *mina = (uchar_t *) &(data->mem_state[NVRAM_REG_MIN_ALARM]);
+ uchar_t *houra = (uchar_t *) &(data->mem_state[NVRAM_REG_HOUR_ALARM]);
+ uchar_t hour24;
+
+ uchar_t bcd = (statb->dm==1);
+ uchar_t carry=0;
+ uchar_t nextday=0;
+ uint_t periodic_period;
+
+ //PrintDebug("nvram: sizeof(struct rtc_stata)=%d\n", sizeof(struct rtc_stata));
+
+
+ //PrintDebug("nvram: update_time\n",statb->pi);
+
+ // We will set these flags on exit
+ statc->irq=statc->pf=statc->af=statc->uf=0;
+
+ // We will reset us after one second
+ data->us += period_us;
+ // We will reset pus after one periodic_period
+ data->pus += period_us;
+
+ if (data->us > 1000000) {
+ carry=1;
+ //PrintDebug("nvram: adding 1 to seconds=0x%x (bcd=%d)...", *sec, bcd);
+ carry=add_to(sec,&carry,bcd);
+ //PrintDebug("got 0x%x with carry=%d\n",*sec,carry);
+ if (carry) { PrintDebug("nvram: somehow managed to get a carry in second update\n"); }
+ if ((bcd && *sec==0x60) || (!bcd && *sec==60)) {
+ *sec=0;
+ carry=1;
+ carry=add_to(min,&carry,bcd);
+ if (carry) { PrintDebug("nvram: somehow managed to get a carry in minute update\n"); }
+ if ((bcd && *min==0x60) || (!bcd && *min==60)) {
+ *min=0;
+ hour24 = *hour;
+ if (!(statb->h24)) {
+ if (hour24&0x80) {
+ hour24&=0x8f;
+ uchar_t temp = bcd ? 0x12 : 12;
+ add_to(&hour24,&temp, bcd);
+ }
+ }
+ carry=1;
+ carry=add_to(&hour24,&carry,bcd);
+ if (carry) { PrintDebug("nvram: somehow managed to get a carry in hour update\n"); }
+ if ((bcd && hour24==0x24) || (!bcd && hour24==24)) {
+ carry=1;
+ nextday=1;
+ hour24=0;
+ } else {
+ carry=0;
+ }
+ if (statb->h24) {
+ *hour=hour24;
+ } else {
+ if ((bcd && hour24<0x12) || (!bcd && hour24<12)) {
+ *hour=hour24;
+ } else {
+ if (!bcd) {
+ *hour = (hour24-12) | 0x80;
+ } else {
+ *hour = hour24;
+ struct bcd_num *n = (struct bcd_num *) hour;
+ if (n->bot<0x2) {
+ n->top--;
+ n->bot+=0xa;
+ }
+ n->bot-=0x2;
+ n->top-=0x1;
+ }
+ }
+ }
+ // now see if we need to carry into the days and further
+ if (nextday) {
+ carry=1;
+ add_to(weekday, &carry, bcd);
+ *weekday%=0x7; // same regardless of bcd
+ if (!(*monthday==days_in_month(dev,*month,bcd))) {
+ add_to(monthday, &carry, bcd);
+ } else {
+ *monthday=0x1;
+ carry=1;
+ add_to(month,&carry,bcd);
+ if ((bcd && *month==0x13) || (!bcd && *month==13)) {
+ *month=1; // same for both
+ carry=1;
+ carry=add_to(year,&carry,bcd);
+ if ((bcd && carry) || (!bcd && *year==100)) {
+ *year=0;
+ carry=1;
+ add_to(cent,&carry,bcd);
+ }
+ }
+ }
+ }
+ }
+ }
+ data->us-=1000000;
+ // OK, now check for the alarm, if it is set to interrupt
+ if (statb->ai) {
+ if (*sec==*seca && *min==*mina && *hour==*houra) {
+ statc->af=1;
+ PrintDebug("nvram: interrupt on alarm\n");
+ }
+ }
+ }
+
+ if (statb->pi) {
+ periodic_period = 1000000/(65536/(0x1 << stata->rate));
+ if (data->pus >= periodic_period) {
+ statc->pf=1;
+ data->pus -= periodic_period;
+ PrintDebug("nvram: interrupt on periodic\n");
+ }
+ }
+
+ if (statb->ui) {
+ statc->uf=1;
+ PrintDebug("nvram: interrupt on update\n");
+ }
+
+ statc->irq= statc->pf || statc->af || statc->uf;
+
+ //PrintDebug("nvram: time is now: YMDHMS: 0x%x:0x%x:0x%x:0x%x:0x%x,0x%x bcd=%d\n", *year, *month, *monthday, *hour, *min, *sec,bcd);
+
+ // Interrupt associated VM, if needed
+ if (statc->irq) {
+ PrintDebug("nvram: injecting interrupt\n");
+ dev->vm->vm_ops.raise_irq(dev->vm, NVRAM_RTC_IRQ);
+ }
+}
+
+
+
+
+void deliver_timer_interrupt_to_vmm(uint_t period_us)
+{
+ struct vm_device *dev = demultiplex_timer_interrupt(period_us);
+
+ if (dev) {
+ update_time(dev,period_us);
+ }
+
+}
+
static int set_nvram_defaults(struct vm_device *dev)
{
struct nvram_internal * nvram_state = (struct nvram_internal*) dev->private_data;
+
+
+
//
// 2 1.44 MB floppy drives
//
// RTC status A
- // time update in progress, default timebase (32KHz, default interrupt rate 1KHz)
- // 10100110
- nvram_state->mem_state[NVRAM_REG_STAT_A] = 0xa6;
+ // 00100110 = no update in progress, base=32768 Hz, rate = 1024 Hz
+ nvram_state->mem_state[NVRAM_REG_STAT_A] = 0x26;
// RTC status B
- // time updates, default timebase (32KHz, default interrupt rate 1KHz)
- // 10100110
- //nvram_state->mem_state[NVRAM_REG_STAT_B] = 0xa6;
-
+ // 00000100 = not setting, no interrupts, blocked rect signal, bcd mode, 24 hour, normal time
+ nvram_state->mem_state[NVRAM_REG_STAT_B] = 0x06;
+ // RTC status C
+ // No IRQ requested, result not do to any source
+ nvram_state->mem_state[NVRAM_REG_STAT_C] = 0x00;
+
+ // RTC status D
+ // Battery is OK
+ nvram_state->mem_state[NVRAM_REG_STAT_D] = 0x80;
+
+
+ // january 1, 2008, 00:00:00
+ nvram_state->mem_state[NVRAM_REG_MONTH] = 0x1;
+ nvram_state->mem_state[NVRAM_REG_MONTH_DAY] = 0x1;
+ nvram_state->mem_state[NVRAM_REG_WEEK_DAY] = 0x1;
+ nvram_state->mem_state[NVRAM_REG_YEAR] = 0x08;
+
+ nvram_state->us=nvram_state->pus=0;
+
return 0;
}
struct vm_device *create_nvram() {
struct nvram_internal * nvram_state = (struct nvram_internal *)V3_Malloc(sizeof(struct nvram_internal)+1000);
- PrintDebug("internal at %x\n",nvram_state);
+ PrintDebug("nvram: internal at %x\n",nvram_state);
struct vm_device *device = create_device("NVRAM", &dev_ops, nvram_state);
+ if (thedev!=NULL) {
+ PrintDebug("nvram: warning! overwriting thedev\n");
+ }
+
+ thedev=device;
return device;
}
