[sir_richard] 45300: [NTOS]: Fix L1/L2 cache detection and write out the size and associativity. Now that KeGetCurrentProcessorNumber doesn't think your L2 cache is the number of CPUs, this can be safely done.
28 Jan
2010
28 Jan
'10
8:43 p.m.
Author: sir_richard
Date: Thu Jan 28 21:43:25 2010
New Revision: 45300
URL: http://svn.reactos.org/svn/reactos?rev=45300&view=rev
Log:
[NTOS]: Fix L1/L2 cache detection and write out the size and associativity. Now that
KeGetCurrentProcessorNumber doesn't think your L2 cache is the number of CPUs, this
can be safely done.
Modified:
trunk/reactos/ntoskrnl/ke/i386/cpu.c
Modified: trunk/reactos/ntoskrnl/ke/i386/cpu.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/ntoskrnl/ke/i386/cpu.c?rev…
==============================================================================
--- trunk/reactos/ntoskrnl/ke/i386/cpu.c [iso-8859-1] (original)
+++ trunk/reactos/ntoskrnl/ke/i386/cpu.c [iso-8859-1] Thu Jan 28 21:43:25 2010
@@ -40,6 +40,7 @@
ULONG KeDcacheFlushCount = 0;
ULONG KeIcacheFlushCount = 0;
ULONG KiDmaIoCoherency = 0;
+ULONG KePrefetchNTAGranularity = 32;
CHAR KeNumberProcessors;
KAFFINITY KeActiveProcessors = 1;
BOOLEAN KiI386PentiumLockErrataPresent;
@@ -453,6 +454,7 @@
ULONG CacheRequests = 0, i;
ULONG CurrentRegister;
UCHAR RegisterByte;
+ ULONG Size, Associativity = 0, CacheLine = 64, CurrentSize = 0;
BOOLEAN FirstPass = TRUE;
/* Set default L2 size */
@@ -517,17 +519,144 @@
* (32MB), or from 0x80 to 0x89 (same size but
* 8-way associative.
*/
- if (((RegisterByte > 0x40) &&
- (RegisterByte <= 0x49)) ||
- ((RegisterByte > 0x80) &&
- (RegisterByte <= 0x89)))
+ if (((RegisterByte > 0x40) && (RegisterByte <=
0x47)) ||
+ ((RegisterByte > 0x78) && (RegisterByte <=
0x7C)) ||
+ ((RegisterByte > 0x80) && (RegisterByte <=
0x85)))
{
+ /* Compute associativity */
+ Associativity = 4;
+ if (RegisterByte >= 0x79) Associativity = 8;
+
/* Mask out only the first nibble */
- RegisterByte &= 0x0F;
-
- /* Set the L2 Cache Size */
- Pcr->SecondLevelCacheSize = 0x10000 <<
- RegisterByte;
+ RegisterByte &= 0x07;
+
+ /* Check if this cache is bigger than the last */
+ Size = 0x10000 << RegisterByte;
+ if ((Size / Associativity) > CurrentSize)
+ {
+ /* Set the L2 Cache Size and Associativity */
+ CurrentSize = Size / Associativity;
+ Pcr->SecondLevelCacheSize = Size;
+ Pcr->SecondLevelCacheAssociativity =
Associativity;
+ }
+ }
+ else if ((RegisterByte > 0x21) && (RegisterByte
<= 0x29))
+ {
+ /* Set minimum cache line size */
+ if (CacheLine < 128) CacheLine = 128;
+
+ /* Hard-code size/associativity */
+ Associativity = 8;
+ switch (RegisterByte)
+ {
+ case 0x22:
+ Size = 512 * 1024;
+ Associativity = 4;
+ break;
+
+ case 0x23:
+ Size = 1024 * 1024;
+ break;
+
+ case 0x25:
+ Size = 2048 * 1024;
+ break;
+
+ case 0x29:
+ Size = 4096 * 1024;
+ break;
+
+ default:
+ Size = 0;
+ break;
+ }
+
+ /* Check if this cache is bigger than the last */
+ if ((Size / Associativity) > CurrentSize)
+ {
+ /* Set the L2 Cache Size and Associativity */
+ CurrentSize = Size / Associativity;
+ Pcr->SecondLevelCacheSize = Size;
+ Pcr->SecondLevelCacheAssociativity =
Associativity;
+ }
+ }
+ else if (((RegisterByte > 0x65) && (RegisterByte
< 0x69)) ||
+ (RegisterByte == 0x2C) || (RegisterByte == 0xF0))
+ {
+ /* Indicates L1 cache line of 64 bytes */
+ KePrefetchNTAGranularity = 64;
+ }
+ else if (RegisterByte == 0xF1)
+ {
+ /* Indicates L1 cache line of 128 bytes */
+ KePrefetchNTAGranularity = 128;
+ }
+ else if (((RegisterByte >= 0x4A) && (RegisterByte
<= 0x4C)) ||
+ (RegisterByte == 0x78) ||
+ (RegisterByte == 0x7D) ||
+ (RegisterByte == 0x7F) ||
+ (RegisterByte == 0x86) ||
+ (RegisterByte == 0x87))
+ {
+ /* Set minimum cache line size */
+ if (CacheLine < 64) CacheLine = 64;
+
+ /* Hard-code size/associativity */
+ switch (RegisterByte)
+ {
+ case 0x4A:
+ Size = 4 * 1024 * 1024;
+ Associativity = 8;
+ break;
+
+ case 0x4B:
+ Size = 6 * 1024 * 1024;
+ Associativity = 12;
+ break;
+
+ case 0x4C:
+ Size = 8 * 1024 * 1024;
+ Associativity = 16;
+ break;
+
+ case 0x78:
+ Size = 1 * 1024 * 1024;
+ Associativity = 4;
+ break;
+
+ case 0x7D:
+ Size = 2 * 1024 * 1024;
+ Associativity = 8;
+ break;
+
+ case 0x7F:
+ Size = 512 * 1024;
+ Associativity = 2;
+ break;
+
+ case 0x86:
+ Size = 512 * 1024;
+ Associativity = 4;
+ break;
+
+ case 0x87:
+ Size = 1 * 1024 * 1024;
+ Associativity = 8;
+ break;
+
+ default:
+ Size = 0;
+ break;
+ }
+
+ /* Check if this cache is bigger than the last */
+ if ((Size / Associativity) > CurrentSize)
+ {
+ /* Set the L2 Cache Size and Associativity */
+ CurrentSize = Size / Associativity;
+ Pcr->SecondLevelCacheSize = Size;
+ Pcr->SecondLevelCacheAssociativity =
Associativity;
+ }
}
}
}
@@ -537,15 +666,65 @@
case CPU_AMD:
- /* Check if we support CPUID 0x80000006 */
- CPUID(0x80000000, &Data[0], &Dummy, &Dummy, &Dummy);
- if (Data[0] >= 6)
+ /* Check if we support CPUID 0x80000005 */
+ CPUID(0x80000000, &Data[0], &Data[1], &Data[2], &Data[3]);
+ if (Data[0] >= 0x80000006)
{
- /* Get 2nd level cache and tlb size */
- CPUID(0x80000006, &Dummy, &Dummy, &Data[2], &Dummy);
-
- /* Set the L2 Cache Size */
- Pcr->SecondLevelCacheSize = (Data[2] & 0xFFFF0000) >> 6;
+ /* Get L1 size first */
+ CPUID(0x80000005, &Data[0], &Data[1], &Data[2],
&Data[3]);
+ KePrefetchNTAGranularity = Data[2] & 0xFF;
+
+ /* Check if we support CPUID 0x80000006 */
+ CPUID(0x80000000, &Data[0], &Data[1], &Data[2],
&Data[3]);
+ if (Data[0] >= 0x80000006)
+ {
+ /* Get 2nd level cache and tlb size */
+ CPUID(0x80000006, &Data[0], &Data[1], &Data[2],
&Data[3]);
+
+ /* Cache line size */
+ CacheLine = Data[2] & 0xFF;
+
+ /* Hardcode associativity */
+ RegisterByte = Data[2] >> 12;
+ switch (RegisterByte)
+ {
+ case 2:
+ Associativity = 2;
+ break;
+
+ case 4:
+ Associativity = 4;
+ break;
+
+ case 6:
+ Associativity = 8;
+ break;
+
+ case 8:
+ case 15:
+ Associativity = 16;
+ break;
+
+ default:
+ Associativity = 1;
+ break;
+ }
+
+ /* Compute size */
+ Size = (Data[2] >> 16) << 10;
+
+ /* Hack for Model 6, Steping 300 */
+ if ((KeGetCurrentPrcb()->CpuType == 6) &&
+ (KeGetCurrentPrcb()->CpuStep == 0x300))
+ {
+ /* Stick 64K in there */
+ Size = 64 * 1024;
+ }
+
+ /* Set the L2 Cache Size and associativity */
+ Pcr->SecondLevelCacheSize = Size;
+ Pcr->SecondLevelCacheAssociativity = Associativity;
+ }
}
break;
@@ -557,6 +736,14 @@
/* FIXME */
break;
}
+
+ /* Set the cache line */
+ if (CacheLine > KeLargestCacheLine) KeLargestCacheLine = CacheLine;
+ DPRINT1("Prefetch Cache: %d bytes\tL2 Cache: %d bytes\tL2 Cache Line: %d
bytes\tL2 Cache Associativity: %d\n",
+ KePrefetchNTAGranularity,
+ Pcr->SecondLevelCacheSize,
+ KeLargestCacheLine,
+ Pcr->SecondLevelCacheAssociativity);
}
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sir_richard＠svn.reactos.org