1 files changed, 177 insertions, 0 deletions
diff --git a/ArmRealViewEbPkg/Library/TimerLib/TimerLib.c b/ArmRealViewEbPkg/Library/TimerLib/TimerLib.c
new file mode 100755
index 0000000000..c56b77acaa
--- /dev/null
+++ b/ArmRealViewEbPkg/Library/TimerLib/TimerLib.c
@@ -0,0 +1,177 @@
+/** @file
+  TimerLib for ARM EB. Hardcoded to 100ns period
+
+  This library assume the following initialization, usually done in SEC. 
+
+  // configure SP810 to use 1MHz clock and disable
+  MmioAndThenOr32 (EB_SP810_CTRL_BASE + SP810_SYS_CTRL_REG, ~SP810_SYS_CTRL_TIMER2_EN, SP810_SYS_CTRL_TIMER2_TIMCLK);
+  // Enable
+  MmioOr32 (EB_SP810_CTRL_BASE + SP810_SYS_CTRL_REG, SP810_SYS_CTRL_TIMER2_EN);
+
+  // configure timer 2 for one shot operation, 32 bits, no prescaler, and interrupt disabled
+  MmioOr32 (EB_SP804_TIMER2_BASE + SP804_TIMER_CONTROL_REG, SP804_TIMER_CTRL_ONESHOT | SP804_TIMER_CTRL_32BIT | SP804_PRESCALE_DIV_1);
+
+  // preload the timer count register
+  MmioWrite32 (EB_SP804_TIMER2_BASE + SP804_TIMER_LOAD_REG, 1);
+
+  // enable the timer
+  MmioOr32 (EB_SP804_TIMER2_BASE + SP804_TIMER_CONTROL_REG, SP804_TIMER_CTRL_ENABLE);
+
+
+  Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
+  
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD License
+  which accompanies this distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <Base.h>
+
+#include <Library/BaseLib.h>
+#include <Library/TimerLib.h>
+#include <Library/DebugLib.h>
+#include <Library/PcdLib.h>
+#include <Library/IoLib.h>
+
+#include <ArmEb/ArmEb.h>
+
+
+/**
+  Stalls the CPU for at least the given number of microseconds.
+
+  Stalls the CPU for the number of microseconds specified by MicroSeconds.
+
+  @param  MicroSeconds  The minimum number of microseconds to delay.
+
+  @return The value of MicroSeconds inputted.
+
+**/
+UINTN
+EFIAPI
+MicroSecondDelay (
+  IN  UINTN MicroSeconds
+  )
+{
+  UINT64  NanoSeconds;
+  
+  NanoSeconds = MultU64x32 (MicroSeconds, 1000);
+
+  while (NanoSeconds > (UINTN)-1) { 
+    NanoSecondDelay((UINTN)-1);
+    NanoSeconds -= (UINTN)-1;
+  }
+
+  NanoSecondDelay (NanoSeconds);
+
+  return MicroSeconds;
+}
+
+/**
+  Stalls the CPU for at least the given number of nanoseconds.
+
+  Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
+
+  @param  NanoSeconds The minimum number of nanoseconds to delay.
+
+  @return The value of NanoSeconds inputted.
+
+**/
+UINTN
+EFIAPI
+NanoSecondDelay (
+  IN  UINTN NanoSeconds
+  )
+{
+  UINT32  TickNumber;
+
+  if (NanoSeconds == 0) {
+    return NanoSeconds;
+  }
+
+  // Round up to 100ns Tick Number
+  TickNumber =   (UINT32)NanoSeconds / 100;
+  TickNumber += ((UINT32)NanoSeconds % 100) == 0 ? 0 : 1;
+
+  // load the timer count register
+  MmioWrite32 (EB_SP804_TIMER2_BASE + SP804_TIMER_LOAD_REG, TickNumber);
+
+  while (MmioRead32 (EB_SP804_TIMER2_BASE + SP804_TIMER_CURRENT_REG) > 0) {
+    ;
+  } 
+ 
+  return NanoSeconds;
+}
+
+/**
+  Retrieves the current value of a 64-bit free running performance counter.
+
+  The counter can either count up by 1 or count down by 1. If the physical
+  performance counter counts by a larger increment, then the counter values
+  must be translated. The properties of the counter can be retrieved from
+  GetPerformanceCounterProperties().
+
+  @return The current value of the free running performance counter.
+
+**/
+UINT64
+EFIAPI
+GetPerformanceCounter (
+  VOID
+  )
+{ 
+  // Free running 64-bit/32-bit counter is needed here.
+  // Don't think we need this to boot, just to do performance profile
+  ASSERT (FALSE);
+  return (UINT64)0ULL;
+}
+
+
+/**
+  Retrieves the 64-bit frequency in Hz and the range of performance counter
+  values.
+
+  If StartValue is not NULL, then the value that the performance counter starts
+  with immediately after is it rolls over is returned in StartValue. If
+  EndValue is not NULL, then the value that the performance counter end with
+  immediately before it rolls over is returned in EndValue. The 64-bit
+  frequency of the performance counter in Hz is always returned. If StartValue
+  is less than EndValue, then the performance counter counts up. If StartValue
+  is greater than EndValue, then the performance counter counts down. For
+  example, a 64-bit free running counter that counts up would have a StartValue
+  of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter
+  that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.
+
+  @param  StartValue  The value the performance counter starts with when it
+                      rolls over.
+  @param  EndValue    The value that the performance counter ends with before
+                      it rolls over.
+
+  @return The frequency in Hz.
+
+**/
+UINT64
+EFIAPI
+GetPerformanceCounterProperties (
+  OUT UINT64  *StartValue,  OPTIONAL
+  OUT UINT64  *EndValue     OPTIONAL
+  )
+{
+  if (StartValue != NULL) {
+    // Timer starts with the reload value
+    *StartValue = (UINT64)0ULL;
+  }
+  
+  if (EndValue != NULL) {
+    // Timer counts up to 0xFFFFFFFF
+    *EndValue = 0xFFFFFFFF;
+  }
+  
+  return 100;
+}
+
+