tyler.durden/kernel
1
0
Fork 0
mirror of https://github.com/FDOS/kernel.git synced 2025-04-08 17:15:17 +02:00
Code Issues Packages Projects Releases Wiki Activity

(suggestion from Arkady)

Browse Source 
if sizeof(struct ClockRecord) != rp->r_count error
move year init below reading the BIOS
remove trailing whitespace


git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@681 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Bart Oldeman 2003-09-09 17:32:20 +00:00
parent 59484b2fc9
commit b4bee283f9
1 changed files with 21 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

63
kernel/sysclk.c
View File

@ -65,33 +65,8 @@ WORD ASMCFUNC FAR clk_driver(rqptr rp)
switch (rp->r_command)
{
case C_INIT:
#if 0
/* If AT clock exists, copy AT clock time to system clock */
if (!ReadATClock(bcd_days, &bcd_hours, &bcd_minutes, &bcd_seconds))
{
ticks_t seconds;
DaysSinceEpoch =
DaysFromYearMonthDay(100 * BcdToByte(bcd_days[3]) +
BcdToByte(bcd_days[2]),
BcdToByte(bcd_days[1]),
BcdToByte(bcd_days[0]));
/*
* This is a rather tricky calculation. The number of timer ticks per
* second is not exactly 18.2, but rather 1193180 / 65536
* where 1193180 = 0x1234dc
* The timer interrupt updates the midnight flag when the tick count
* reaches 0x1800b0 -- ror4.
*/
seconds =
60 * (ticks_t)(60 * BcdToByte(bcd_hours) + BcdToByte(bcd_minutes)) +
BcdToByte(bcd_seconds);
WritePCClock(seconds * 0x12 + ((seconds * 0x34dc) >> 16));
}
#endif
/* done in initclk.c */
/* rp->r_endaddr = device_end(); not needed - bart */
rp->r_nunits = 0;
return S_DONE;
@ -101,26 +76,28 @@ WORD ASMCFUNC FAR clk_driver(rqptr rp)
struct ClockRecord clk;
int tmp;
ticks_t ticks;
clk.clkDays = DaysSinceEpoch;
if (sizeof(struct ClockRecord) != rp->r_count)
return failure(E_LENGTH);
/* The scaling factor is now
6553600/1193180 = 327680/59659 = 65536*5/59659 */
ticks = 5 * ReadPCClock();
ticks = 5 * ReadPCClock();
ticks = ((ticks / 59659u) << 16) + ((ticks % 59659u) << 16) / 59659u;
tmp = (int)(ticks / 6000);
clk.clkHours = tmp / 60;
clk.clkMinutes = tmp % 60;
tmp = (int)(ticks % 6000);
clk.clkSeconds = tmp / 100;
clk.clkHundredths = tmp % 100;
fmemcpy(rp->r_trans, &clk,
min(sizeof(struct ClockRecord), rp->r_count));
}
clk.clkHundredths = tmp % 100;
clk.clkDays = DaysSinceEpoch;
fmemcpy(rp->r_trans, &clk, sizeof(struct ClockRecord));
}
return S_DONE;
case C_OUTPUT:
@ -129,9 +106,11 @@ WORD ASMCFUNC FAR clk_driver(rqptr rp)
unsigned Day, Month, Year;
struct ClockRecord clk;
ticks_t hs, Ticks;
rp->r_count = min(rp->r_count, sizeof(struct ClockRecord));
fmemcpy(&clk, rp->r_trans, rp->r_count);
if (sizeof(struct ClockRecord) != rp->r_count)
return failure(E_LENGTH);
fmemcpy(&clk, rp->r_trans, sizeof(struct ClockRecord));
/* Set PC Clock first */
DaysSinceEpoch = clk.clkDays;
@ -140,7 +119,7 @@ WORD ASMCFUNC FAR clk_driver(rqptr rp)
/* The scaling factor is now
1193180/6553600 = 59659/327680 = 59659/65536/5 */
Ticks = ((hs >> 16) * 59659u + (((hs & 0xffff) * 59659u) >> 16)) / 5;
WritePCClock(Ticks);
@ -159,7 +138,7 @@ WORD ASMCFUNC FAR clk_driver(rqptr rp)
else
break;
}
/* Day contains the days left and count the number of */
/* days for that year. Use this to index the table. */
for (Month = 1; Month < 13; ++Month)