}
else if (!strcmp((PCHAR)Prcb->VendorString, CmpCyrixID))
{
- DPRINT1("Cyrix CPUs not fully supported\n");
- return 0;
+ DPRINT1("Cyrix CPU support not fully tested!\n");
+ return CPU_CYRIX;
}
else if (!strcmp((PCHAR)Prcb->VendorString, CmpTransmetaID))
{
- DPRINT1("Transmeta CPUs not fully supported\n");
- return 0;
+ DPRINT1("Transmeta CPU support not fully tested!\n");
+ return CPU_TRANSMETA;
}
else if (!strcmp((PCHAR)Prcb->VendorString, CmpCentaurID))
{
- DPRINT1("VIA CPUs not fully supported\n");
- return 0;
+ DPRINT1("Centaur CPU support not fully tested!\n");
+ return CPU_CENTAUR;
}
else if (!strcmp((PCHAR)Prcb->VendorString, CmpRiseID))
{
- DPRINT1("Rise CPUs not fully supported\n");
- return 0;
+ DPRINT1("Rise CPU support not fully tested!\n");
+ return CPU_RISE;
}
/* Invalid CPU */
/* Set the initial APIC ID */
Prcb->InitialApicId = (UCHAR)(Reg[1] >> 24);
- /* Check for AMD CPU */
- if (Vendor == CPU_AMD)
+ switch (Vendor)
{
- /* Check if this is a K5 or higher. */
- if ((Reg[0] & 0x0F00) >= 0x0500)
- {
- /* Check if this is a K5 specifically. */
+ /* Intel CPUs */
+ case CPU_INTEL:
+ /* Check if it's a P6 */
+ if (Prcb->CpuType == 6)
+ {
+ /* Perform the special sequence to get the MicroCode Signature */
+ WRMSR(0x8B, 0);
+ CPUID(Reg, 1);
+ Prcb->UpdateSignature.QuadPart = RDMSR(0x8B);
+ }
+ else if (Prcb->CpuType == 5)
+ {
+ /* On P5, enable workaround for the LOCK errata. */
+ KiI386PentiumLockErrataPresent = TRUE;
+ }
+
+ /* Check for broken P6 with bad SMP PTE implementation */
+ if (((Reg[0] & 0x0FF0) == 0x0610 && (Reg[0] & 0x000F) <= 0x9) ||
+ ((Reg[0] & 0x0FF0) == 0x0630 && (Reg[0] & 0x000F) <= 0x4))
+ {
+ /* Remove support for correct PTE support. */
+ FeatureBits &= ~KF_WORKING_PTE;
+ }
+
+ /* Check if the CPU is too old to support SYSENTER */
+ if ((Prcb->CpuType < 6) ||
+ ((Prcb->CpuType == 6) && (Prcb->CpuStep < 0x0303)))
+ {
+ /* Disable it */
+ Reg[3] &= ~0x800;
+ }
+
+ /* Set the current features */
+ CpuFeatures = Reg[3];
+
+ break;
+
+ /* AMD CPUs */
+ case CPU_AMD:
+
+ /* Check if this is a K5 or K6. (family 5) */
if ((Reg[0] & 0x0F00) == 0x0500)
{
/* Get the Model Number */
switch (Reg[0] & 0x00F0)
{
- /* Check if this is the Model 1 */
+ /* Model 1: K5 - 5k86 (initial models) */
case 0x0010:
/* Check if this is Step 0 or 1. They don't support PGE */
if ((Reg[0] & 0x000F) > 0x03) break;
+ /* Model 0: K5 - SSA5 */
case 0x0000:
/* Model 0 doesn't support PGE at all. */
Reg[3] &= ~0x2000;
break;
+ /* Model 8: K6-2 */
case 0x0080:
/* K6-2, Step 8 and over have support for MTRR. */
if ((Reg[0] & 0x000F) >= 0x8) FeatureBits |= KF_AMDK6MTRR;
break;
+ /* Model 9: K6-III
+ Model D: K6-2+, K6-III+ */
case 0x0090:
+ case 0x00D0:
- /* As does the K6-3 */
FeatureBits |= KF_AMDK6MTRR;
break;
-
- default:
- break;
}
}
- }
- else
- {
- /* Families below 5 don't support PGE, PSE or CMOV at all */
- Reg[3] &= ~(0x08 | 0x2000 | 0x8000);
+ else if((Reg[0] & 0x0F00) < 0x0500)
+ {
+ /* Families below 5 don't support PGE, PSE or CMOV at all */
+ Reg[3] &= ~(0x08 | 0x2000 | 0x8000);
- /* They also don't support advanced CPUID functions. */
- ExtendedCPUID = FALSE;
- }
+ /* They also don't support advanced CPUID functions. */
+ ExtendedCPUID = FALSE;
+ }
- /* Set the current features */
- CpuFeatures = Reg[3];
- }
+ /* Set the current features */
+ CpuFeatures = Reg[3];
- /* Now check if this is Intel */
- if (Vendor == CPU_INTEL)
- {
- /* Check if it's a P6 */
- if (Prcb->CpuType == 6)
- {
- /* Perform the special sequence to get the MicroCode Signature */
- WRMSR(0x8B, 0);
- CPUID(Reg, 1);
- Prcb->UpdateSignature.QuadPart = RDMSR(0x8B);
- }
- else if (Prcb->CpuType == 5)
- {
- /* On P5, enable workaround for the LOCK errata. */
- KiI386PentiumLockErrataPresent = TRUE;
- }
+ break;
- /* Check for broken P6 with bad SMP PTE implementation */
- if (((Reg[0] & 0x0FF0) == 0x0610 && (Reg[0] & 0x000F) <= 0x9) ||
- ((Reg[0] & 0x0FF0) == 0x0630 && (Reg[0] & 0x000F) <= 0x4))
- {
- /* Remove support for correct PTE support. */
- FeatureBits &= ~KF_WORKING_PTE;
- }
+ /* Cyrix CPUs */
+ case CPU_CYRIX:
+ break;
- /* Check if the CPU is too old to support SYSENTER */
- if ((Prcb->CpuType < 6) ||
- ((Prcb->CpuType == 6) && (Prcb->CpuStep < 0x0303)))
- {
- /* Disable it */
- Reg[3] &= ~0x800;
- }
+ /* Transmeta CPUs */
+ case CPU_TRANSMETA:
+ /* Enable CMPXCHG8B if the family (>= 5), model and stepping (>= 4.2) support it */
+ if ((Reg[0] & 0x0FFF) >= 0x0542)
+ {
+ WRMSR(0x80860004, RDMSR(0x80860004) | 0x0100);
+ FeatureBits |= KF_CMPXCHG8B;
+ }
+
+ break;
- /* Set the current features */
- CpuFeatures = Reg[3];
+ /* Centaur, IDT, Rise and VIA CPUs */
+ case CPU_CENTAUR:
+ case CPU_RISE:
+ /* These CPUs don't report the presence of CMPXCHG8B through CPUID.
+ However, this feature exists and operates properly without any additional steps. */
+ FeatureBits |= KF_CMPXCHG8B;
+
+ break;
}
/* Convert all CPUID Feature bits into our format */
switch (Vendor)
{
case CPU_AMD:
+ case CPU_CENTAUR:
if (Reg[3] & 0x80000000) FeatureBits |= KF_3DNOW;
break;
}
projects / reactos.git / blobdiff