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Check if the cpu supports the pae mode.

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svn path=/trunk/; revision=16899
This commit is contained in:
Hartmut Birr 2005-07-30 18:55:25 +00:00
parent dce178cf7c
commit 2316f95498
1 changed files with 33 additions and 22 deletions
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55
reactos/boot/freeldr/freeldr/reactos/loader.c
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@ -20,6 +20,7 @@
*/
#include <freeldr.h>
#include <../arch/i386/hardware.h>
#include <internal/i386/ke.h>
#define NDEBUG
@ -279,32 +280,42 @@ VOID
FASTCALL
FrLdrGetPaeMode(VOID)
{
PCHAR p;
BOOLEAN PaeModeSupported;
PaeModeSupported = FALSE;
PaeModeEnabled = FALSE;
/* Read Command Line */
p = (PCHAR)LoaderBlock.CommandLine;
while ((p = strchr(p, '/')) != NULL) {
p++;
/* Find "PAE" */
if (!strnicmp(p, "PAE", 3)) {
/* Make sure there's nothing following it */
if (p[3] == ' ' || p[3] == 0) {
/* Use Pae */
PaeModeEnabled = TRUE;
break;
}
}
}
if (PaeModeEnabled)
if (CpuidSupported() & 1)
{
/* FIXME:
* Check if the cpu is pae capable
*/
ULONG eax, ebx, ecx, FeatureBits;
GetCpuid(1, &eax, &ebx, &ecx, &FeatureBits);
if (FeatureBits & X86_FEATURE_PAE)
{
PaeModeSupported = TRUE;
}
}
if (PaeModeSupported)
{
PCHAR p;
/* Read Command Line */
p = (PCHAR)LoaderBlock.CommandLine;
while ((p = strchr(p, '/')) != NULL) {
p++;
/* Find "PAE" */
if (!strnicmp(p, "PAE", 3)) {
/* Make sure there's nothing following it */
if (p[3] == ' ' || p[3] == 0) {
/* Use Pae */
PaeModeEnabled = TRUE;
break;
}
}
}
}
}