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[HALXBOX] Fix clock drift (#2889)

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Add a new rollover table for Original Xbox (base frequency is 1.125000 MHz).
This fixes potential time issues in kernel and drivers.

CORE-16216
This commit is contained in:
Dmitry Borisov 2020-06-03 05:14:16 +06:00 • committed by GitHub
parent 092bc78a42
commit 17c5fb8866
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GPG key ID: 4AEE18F83AFDEB23
7 changed files with 76 additions and 24 deletions
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28
hal/halx86/generic/timer.c
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@ -10,6 +10,7 @@
/* INCLUDES ******************************************************************/
#include <hal.h>
#define NDEBUG
#include <debug.h>
@ -21,6 +22,8 @@
#define PIT_LATCH 0x00
extern HALP_ROLLOVER HalpRolloverTable[15];
LARGE_INTEGER HalpLastPerfCounter;
LARGE_INTEGER HalpPerfCounter;
ULONG HalpPerfCounterCutoff;
@ -30,29 +33,6 @@ ULONG HalpCurrentRollOver;
ULONG HalpNextMSRate = 14;
ULONG HalpLargestClockMS = 15;
static struct _HALP_ROLLOVER
{
ULONG RollOver;
ULONG Increment;
} HalpRolloverTable[15] =
{
{1197, 10032},
{2394, 20064},
{3591, 30096},
{4767, 39952},
{5964, 49984},
{7161, 60016},
{8358, 70048},
{9555, 80080},
{10731, 89936},
{11949, 100144},
{13125, 110000},
{14322, 120032},
{15519, 130064},
{16695, 139920},
{17892, 149952}
};
/* PRIVATE FUNCTIONS *********************************************************/
FORCEINLINE
@ -88,7 +68,7 @@ HalpSetTimerRollOver(USHORT RollOver)
TimerControl.BcdMode = FALSE;
/*
* Program the PIT to generate a normal rate wave (Mode 3) on channel 0.
* Program the PIT to generate a normal rate wave (Mode 2) on channel 0.
* Channel 0 is used for the IRQ0 clock interval timer, and channel
* 1 is used for DRAM refresh.
*