From: Pierre Gondois <pierre.gond...@arm.com>
In ACPI 6.4, s6.2.13, _PRT objects describing PCI legacy interrupts
can be defined following 2 models.
In the first model, _PRT entries reference link devices. Link devices
then describe interrupts. This allows to dynamically modify
interrupts through _SRS and _PRS objects and to choose exactly the
interrupt type (level/edge triggered, active high/low).
In the second model, interrupt numbers are described in the _PRT entry.
The interrupt type is then assumed by the OS.
AmlAddPrtEntry() currently only handles the first model. Make
changes to also handle the second model.
Signed-off-by: Pierre Gondois <pierre.gond...@arm.com>
---
Notes:
v4:
- New patch (to handle GSI description in _PRT). [Pierre]
.../Common/AmlLib/CodeGen/AmlCodeGen.c | 89 ++++++++++++-------
1 file changed, 55 insertions(+), 34 deletions(-)
diff --git a/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
b/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
index d245848ce3fa..2d55db97c7bf 100644
--- a/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
+++ b/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
@@ -1,7 +1,7 @@
/** @file
AML Code Generation.
- Copyright (c) 2020 - 2021, Arm Limited. All rights reserved.<BR>
+ Copyright (c) 2020 - 2022, Arm Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
@@ -881,6 +881,9 @@ AmlCodeGenNameResourceTemplate (
// interrupt, so let it to index 0.
}
+ The 2 models described in ACPI 6.4, s6.2.13 "_PRT (PCI Routing Table)" can
+ be generated by this function. The example above matches the first model.
+
The package is added at the tail of the list of the input _PRT node
name:
Name (_PRT, Package () {
@@ -901,8 +904,10 @@ AmlCodeGenNameResourceTemplate (
@param [in] Pin PCI pin number of the device (0-INTA ... 3-INTD).
Must be between 0-3.
@param [in] LinkName Link Name, i.e. device in the AML NameSpace
- describing the interrupt used.
- The input string is copied.
+ describing the interrupt used. The input string
+ is copied.
+ If NULL, generate 0 in the 'Source' field (cf.
+ second model, using GSIV).
@param [in] SourceIndex Source index or GSIV.
@param [in] PrtNameNode Prt Named node to add the object to ....
@@ -930,7 +935,6 @@ AmlAddPrtEntry (
AML_DATA_NODE *DataNode;
if ((Pin > 3) ||
- (LinkName == NULL) ||
(PrtNameNode == NULL) ||
(AmlGetNodeType ((AML_NODE_HANDLE)PrtNameNode) != EAmlNodeObject) ||
(!AmlNodeHasOpCode (PrtNameNode, AML_NAME_OP, 0)) ||
@@ -999,41 +1003,58 @@ AmlAddPrtEntry (
NewElementNode = NULL;
- Status = ConvertAslNameToAmlName (LinkName, &AmlNameString);
- if (EFI_ERROR (Status)) {
- ASSERT (0);
- goto error_handler;
- }
+ if (LinkName != NULL) {
+ Status = ConvertAslNameToAmlName (LinkName, &AmlNameString);
+ if (EFI_ERROR (Status)) {
+ ASSERT_EFI_ERROR (Status);
+ goto error_handler;
+ }
- Status = AmlGetNameStringSize (AmlNameString, &AmlNameStringSize);
- if (EFI_ERROR (Status)) {
- ASSERT (0);
- goto error_handler;
- }
+ Status = AmlGetNameStringSize (AmlNameString, &AmlNameStringSize);
+ if (EFI_ERROR (Status)) {
+ ASSERT_EFI_ERROR (Status);
+ goto error_handler;
+ }
- Status = AmlCreateDataNode (
- EAmlNodeDataTypeNameString,
- (UINT8 *)AmlNameString,
- AmlNameStringSize,
- &DataNode
- );
- if (EFI_ERROR (Status)) {
- ASSERT (0);
- goto error_handler;
- }
+ Status = AmlCreateDataNode (
+ EAmlNodeDataTypeNameString,
+ (UINT8 *)AmlNameString,
+ AmlNameStringSize,
+ &DataNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT_EFI_ERROR (Status);
+ goto error_handler;
+ }
- // AmlNameString will be freed before returning.
+ // AmlNameString will be freed be fore returning.
- Status = AmlVarListAddTail (
- (AML_NODE_HANDLE)PackageNode,
- (AML_NODE_HANDLE)DataNode
- );
- if (EFI_ERROR (Status)) {
- ASSERT (0);
- goto error_handler;
- }
+ Status = AmlVarListAddTail (
+ (AML_NODE_HANDLE)PackageNode,
+ (AML_NODE_HANDLE)DataNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT_EFI_ERROR (Status);
+ goto error_handler;
+ }
+
+ DataNode = NULL;
+ } else {
+ Status = AmlCodeGenInteger (0, &NewElementNode);
+ if (EFI_ERROR (Status)) {
+ ASSERT_EFI_ERROR (Status);
+ goto error_handler;
+ }
- DataNode = NULL;
+ Status = AmlVarListAddTail (
+ (AML_NODE_HANDLE)PackageNode,
+ (AML_NODE_HANDLE)NewElementNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT_EFI_ERROR (Status);
+ goto error_handler;
+ }
+ }
Status = AmlCodeGenInteger (SourceIndex, &NewElementNode);
if (EFI_ERROR (Status)) {
--
2.25.1
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