diff options
Diffstat (limited to 'OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c')
| -rw-r--r-- | OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c | 165 |
1 files changed, 155 insertions, 10 deletions
diff --git a/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c b/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c index b1b2c5cd8d..3964697379 100644 --- a/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c +++ b/OvmfPkg/PciHotPlugInitDxe/PciHotPlugInit.c @@ -15,6 +15,7 @@ #include <IndustryStandard/Acpi10.h>
+#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/DevicePathLib.h>
@@ -99,6 +100,153 @@ InitializeResourcePadding ( /**
+ Set up a descriptor entry for reserving IO space.
+
+ @param[in,out] Descriptor The descriptor to configure. The caller shall have
+ initialized Descriptor earlier, with
+ InitializeResourcePadding().
+
+ @param[in] SizeExponent The size and natural alignment of the reservation
+ are determined by raising two to this power.
+**/
+STATIC
+VOID
+SetIoPadding (
+ IN OUT EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptor,
+ IN UINTN SizeExponent
+ )
+{
+ Descriptor->ResType = ACPI_ADDRESS_SPACE_TYPE_IO;
+ Descriptor->AddrLen = LShiftU64 (1, SizeExponent);
+ Descriptor->AddrRangeMax = Descriptor->AddrLen - 1;
+}
+
+
+/**
+ Set up a descriptor entry for reserving MMIO space.
+
+ @param[in,out] Descriptor The descriptor to configure. The caller shall
+ have initialized Descriptor earlier, with
+ InitializeResourcePadding().
+
+ @param[in] Prefetchable TRUE if the descriptor should reserve
+ prefetchable MMIO space. Pass FALSE for
+ reserving non-prefetchable MMIO space.
+
+ @param[in] ThirtyTwoBitOnly TRUE if the reservation should be limited to
+ 32-bit address space. FALSE if the reservation
+ can be satisfied from 64-bit address space.
+ ThirtyTwoBitOnly is ignored if Prefetchable is
+ FALSE; in that case ThirtyTwoBitOnly is always
+ considered TRUE.
+
+ @param[in] SizeExponent The size and natural alignment of the
+ reservation are determined by raising two to
+ this power.
+**/
+STATIC
+VOID
+SetMmioPadding (
+ IN OUT EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Descriptor,
+ IN BOOLEAN Prefetchable,
+ IN BOOLEAN ThirtyTwoBitOnly,
+ IN UINTN SizeExponent
+ )
+{
+ Descriptor->ResType = ACPI_ADDRESS_SPACE_TYPE_MEM;
+ if (Prefetchable) {
+ Descriptor->SpecificFlag =
+ EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_CACHEABLE_PREFETCHABLE;
+ Descriptor->AddrSpaceGranularity = ThirtyTwoBitOnly ? 32 : 64;
+ } else {
+ Descriptor->SpecificFlag =
+ EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_NON_CACHEABLE;
+ Descriptor->AddrSpaceGranularity = 32;
+ }
+ Descriptor->AddrLen = LShiftU64 (1, SizeExponent);
+ Descriptor->AddrRangeMax = Descriptor->AddrLen - 1;
+}
+
+
+/**
+ Round up a positive 32-bit value to the next whole power of two, and return
+ the bit position of the highest bit set in the result. Equivalent to
+ ceil(log2(x)).
+
+ @param[in] Operand The 32-bit operand to evaluate.
+
+ @retval -1 Operand is zero.
+
+ @retval -1 Operand is positive, not a whole power of two, and rounding it
+ up to the next power of two does not fit into 32 bits.
+
+ @retval 0..31 Otherwise, return ceil(log2(Value)).
+**/
+STATIC
+INTN
+HighBitSetRoundUp32 (
+ IN UINT32 Operand
+ )
+{
+ INTN HighBit;
+
+ HighBit = HighBitSet32 (Operand);
+ if (HighBit == -1) {
+ //
+ // Operand is zero.
+ //
+ return HighBit;
+ }
+ if ((Operand & (Operand - 1)) != 0) {
+ //
+ // Operand is not a whole power of two.
+ //
+ ++HighBit;
+ }
+ return (HighBit < 32) ? HighBit : -1;
+}
+
+
+/**
+ Round up a positive 64-bit value to the next whole power of two, and return
+ the bit position of the highest bit set in the result. Equivalent to
+ ceil(log2(x)).
+
+ @param[in] Operand The 64-bit operand to evaluate.
+
+ @retval -1 Operand is zero.
+
+ @retval -1 Operand is positive, not a whole power of two, and rounding it
+ up to the next power of two does not fit into 64 bits.
+
+ @retval 0..63 Otherwise, return ceil(log2(Value)).
+**/
+STATIC
+INTN
+HighBitSetRoundUp64 (
+ IN UINT64 Operand
+ )
+{
+ INTN HighBit;
+
+ HighBit = HighBitSet64 (Operand);
+ if (HighBit == -1) {
+ //
+ // Operand is zero.
+ //
+ return HighBit;
+ }
+ if ((Operand & (Operand - 1)) != 0) {
+ //
+ // Operand is not a whole power of two.
+ //
+ ++HighBit;
+ }
+ return (HighBit < 64) ? HighBit : -1;
+}
+
+
+/**
Returns a list of root Hot Plug Controllers (HPCs) that require
initialization during the boot process.
@@ -298,10 +446,7 @@ GetResourcePadding ( //
// Request defaults.
//
- --FirstResource;
- FirstResource->ResType = ACPI_ADDRESS_SPACE_TYPE_IO;
- FirstResource->AddrRangeMax = 512 - 1; // align at 512 IO ports
- FirstResource->AddrLen = 512; // 512 IO ports
+ SetIoPadding (--FirstResource, (UINTN)HighBitSetRoundUp64 (512));
}
//
@@ -311,12 +456,12 @@ GetResourcePadding ( //
// Request defaults.
//
- --FirstResource;
- FirstResource->ResType = ACPI_ADDRESS_SPACE_TYPE_MEM;
- FirstResource->SpecificFlag = 0; // non-prefetchable
- FirstResource->AddrSpaceGranularity = 32; // 32-bit aperture
- FirstResource->AddrRangeMax = SIZE_2MB - 1; // align at 2MB
- FirstResource->AddrLen = SIZE_2MB; // 2MB padding
+ SetMmioPadding (
+ --FirstResource,
+ FALSE,
+ TRUE,
+ (UINTN)HighBitSetRoundUp32 (SIZE_2MB)
+ );
}
//
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