X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=KernelLand%2FKernel%2Farch%2Fx86%2Ftime.c;h=54e59a5d2d9ac520ebaa8dedbddda239304db8ae;hb=902813fd2da685f025636a13d9f176b592cc8b33;hp=9b59b30b100c94f68cc184bcc2f386450e5b32e9;hpb=51ab5f489bc356940c95cc936fd0508e8f07ea97;p=tpg%2Facess2.git

diff --git a/KernelLand/Kernel/arch/x86/time.c b/KernelLand/Kernel/arch/x86/time.c
index 9b59b30b..54e59a5d 100644
--- a/KernelLand/Kernel/arch/x86/time.c
+++ b/KernelLand/Kernel/arch/x86/time.c
@@ -4,6 +4,7 @@
  * arch/x86/time.c
  */
 #include <acess.h>
+#include <timers.h>
 
 // === MACROS ===
 #define	TIMER_QUANTUM	100
@@ -15,6 +16,7 @@
 #define TIMER_FREQ	(0x8000>>TIMER_RATE)	//Hz
 #define MS_PER_TICK_WHOLE	(1000/(TIMER_FREQ))
 #define MS_PER_TICK_FRACT	((0x80000000*(1000%TIMER_FREQ))/TIMER_FREQ)
+#define US_PER_TICK	(1000*1000/(TIMER_FREQ))
 
 // === IMPORTS ===
 extern volatile Sint64	giTimestamp;
@@ -119,6 +121,21 @@ void Time_Interrupt(int IRQ, void *Ptr)
 	inb(0x71);	// Just throw away contents.
 }
 
+void Time_MicroSleep(Uint16 Microsecs)	// max 64 ms
+{
+	Uint64	cur_tsc = Time_ReadTSC();
+	// tsc_per_us * Microsec
+	Uint64	delta_tsc = (Uint64)Microsecs * giTime_TSCPerTick / US_PER_TICK;
+	Uint64	tgt_tsc = cur_tsc + delta_tsc;
+
+	if( tgt_tsc < cur_tsc )
+		while(Time_ReadTSC() > cur_tsc)
+			;	
+
+	while( Time_ReadTSC() < tgt_tsc )
+		;
+}
+
 Uint64 Time_ReadTSC(void)
 {
 	Uint32	a, d;