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1. Updated declaration of timer functions according to latest MWG.

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2. Updated coding style.
3. Updated the algorithm used in delay functions to handle timer counter wrap-around.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1089 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
bxing
2006-07-25 07:33:02 +00:00
parent 26015d2294
commit ed384ef31c
4 changed files with 228 additions and 76 deletions
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106
MdePkg/Library/BaseTimerLibLocalApic/Ipf/IpfTimerLib.c
View File

@ -18,11 +18,6 @@
**/
UINT64
ReadItc (
VOID
);
typedef struct {
UINT64 Status;
UINT64 r9;
@ -30,6 +25,21 @@ typedef struct {
UINT64 r11;
} PAL_PROC_RETURN;
/**
Performs a PAL call using static calling convention.
An internal function to perform a PAL call using static calling convention.
@param PalEntryPoint The entry point address of PAL. The address in ar.kr5
would be used if this parameter were NULL on input.
@param Arg1 The first argument of a PAL call.
@param Arg1 The second argument of a PAL call.
@param Arg1 The third argument of a PAL call.
@param Arg1 The fourth argument of a PAL call.
@return The values returned in r8, r9, r10 and r11.
**/
PAL_PROC_RETURN
PalCallStatic (
IN CONST VOID *PalEntryPoint,
@ -39,6 +49,50 @@ PalCallStatic (
IN UINT64 Arg4
);
/**
Returns the current value of ar.itc.
An internal function to return the current value of ar.itc, which is the
timer tick on IPF.
@return The currect value of ar.itc
**/
INT64
InternalIpfReadItc (
VOID
);
/**
Performs a delay measured as number of ticks.
An internal function to perform a delay measured as number of ticks. It's
invoked by MicroSecondDelay() and NanoSecondDelay().
@param Delay Number of ticks to delay.
**/
STATIC
VOID
InternalIpfDelay (
IN INT64 Delay
)
{
INT64 Ticks;
//
// The target timer count is calculated here
//
Ticks = InternalIpfReadItc () + Delay;
//
// Wait until time out
// Delay > 2^63 could not be handled by this function
// Timer wrap-arounds are handled correctly by this function
//
while (Ticks - InternalIpfReadItc () >= 0);
}
/**
Stalls the CPU for at least the given number of microseconds.
@ -46,7 +100,7 @@ PalCallStatic (
@param MicroSeconds The minimum number of microseconds to delay.
@return The ticks delayed actually.
@return MicroSeconds
**/
UINTN
@ -55,13 +109,12 @@ MicroSecondDelay (
IN UINTN MicroSeconds
)
{
UINT64 Ticks;
UINT64 Delay;
Ticks = GetPerformanceCounter ();
Delay = GetPerformanceCounterProperties (NULL, NULL) * MicroSeconds / 1000000;
while (Ticks + Delay >= GetPerformanceCounter ());
return (UINTN)Delay;
InternalIpfDelay (
GetPerformanceCounterProperties (NULL, NULL) *
MicroSeconds /
1000000
);
return MicroSeconds;
}
/**
@ -71,7 +124,7 @@ MicroSecondDelay (
@param NanoSeconds The minimum number of nanoseconds to delay.
@return The ticks delayed actually.
@return NanoSeconds
**/
UINTN
@ -80,13 +133,12 @@ NanoSecondDelay (
IN UINTN NanoSeconds
)
{
UINT64 Ticks;
UINT64 Delay;
Ticks = GetPerformanceCounter ();
Delay = GetPerformanceCounterProperties (NULL, NULL) * NanoSeconds / 1000000000;
while (Ticks + Delay >= GetPerformanceCounter ());
return (UINTN)Delay;
InternalIpfDelay (
GetPerformanceCounterProperties (NULL, NULL) *
NanoSeconds /
1000000000
);
return NanoSeconds;
}
/**
@ -107,7 +159,7 @@ GetPerformanceCounter (
VOID
)
{
return ReadItc ();
return InternalIpfReadItc ();
}
/**
@ -150,7 +202,13 @@ GetPerformanceCounterProperties (
PalRet = PalCallStatic (NULL, 14, 0, 0, 0);
ASSERT (PalRet.Status == 0);
*StartValue = 0;
*EndValue = (UINT64)(-1);
if (StartValue != NULL) {
*StartValue = 0;
}
if (EndValue != NULL) {
*EndValue = (UINT64)(-1);
}
return BaseFrequence * (PalRet.r11 >> 32) / (UINT32)PalRet.r11;
}