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Diffstat (limited to 'ReferenceCode/Chipset/SystemAgent/AcpiTables/SaSsdt/SaPcieDsm.asl')
| -rw-r--r-- | ReferenceCode/Chipset/SystemAgent/AcpiTables/SaSsdt/SaPcieDsm.asl | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/ReferenceCode/Chipset/SystemAgent/AcpiTables/SaSsdt/SaPcieDsm.asl b/ReferenceCode/Chipset/SystemAgent/AcpiTables/SaSsdt/SaPcieDsm.asl new file mode 100644 index 0000000..613138c --- /dev/null +++ b/ReferenceCode/Chipset/SystemAgent/AcpiTables/SaSsdt/SaPcieDsm.asl @@ -0,0 +1,119 @@ +/**************************************************************************; +;* *; +;* Intel Confidential *; +;* *; +;* Intel Corporation - ACPI Reference Code for the Haswell *; +;* Family of Customer Reference Boards. *; +;* *; +;* *; +;* Copyright (c) 1999 - 2012 Intel Corporation. All rights reserved *; +;* This software and associated documentation (if any) is furnished *; +;* under a license and may only be used or copied in accordance *; +;* with the terms of the license. Except as permitted by such *; +;* license, no part of this software or documentation may be *; +;* reproduced, stored in a retrieval system, or transmitted in any *; +;* form or by any means without the express written consent of *; +;* Intel Corporation. *; +;* *; +;* *; +;**************************************************************************/ +/*++ + This file contains an 'Intel Peripheral Driver' and is + licensed for Intel CPUs and chipsets under the terms of your + license agreement with Intel or your vendor. This file may + be modified by the user, subject to additional terms of the + license agreement +--*/ + + Name(LTRV, Package(){0,0,0,0}) + Name(OPTS, 0) // SA SETUP options for LTR and OBFF + + // + // _DSM Device Specific Method + // + // Arg0: UUID Unique function identifier + // Arg1: Integer Revision Level + // Arg2: Integer Function Index (0 = Return Supported Functions) + // Arg3: Package Parameters + Method(_DSM, 4, Serialized) { + // + // Switch based on which unique function identifier was passed in + // + Switch(ToInteger(Arg0)) { + // + // _DSM Definitions for Latency Tolerance Reporting + // + // Arguments: + // Arg0: UUID: E5C937D0-3553-4d7a-9117-EA4D19C3434D + // Arg1: Revision ID: 2 + // Arg2: Function Index: 6 + // Arg3: Empty Package + // + // Return: + // A Package of four integers corresponding with the LTR encoding defined + // in the PCI Express Base Specification, as follows: + // Integer 0: Maximum Snoop Latency Scale + // Integer 1: Maximum Snoop Latency Value + // Integer 2: Maximum No-Snoop Latency Scale + // Integer 3: Maximum No-Snoop Latency Value + // These values correspond directly to the LTR Extended Capability Structure + // fields described in the PCI Express Base Specification. + // + Case(ToUUID("E5C937D0-3553-4d7a-9117-EA4D19C3434D")) { + // + // Switch by function index + // + Switch(ToInteger(Arg2)) { + // + // Function Index:0 + // Standard query - A bitmask of functions supported + // + Case (0) + { + if (LEqual(Arg1, 2)){ // test Arg1 for Revision ID: 2 + Store(1, OPTS) // function 0 + if (LTRS){ + Or(OPTS,0x40,OPTS) // function 6 + } + if (OBFS){ + Or(OPTS,0x10,OPTS) // function 4 + } + Return (OPTS) // bitmask of supported functions: 6, 4, 0. + } else { + Return (0) + } + } + // + // Function Index: 4 + // + Case(4) { + if (LEqual(Arg1, 2)){ // test Arg1 for Revision ID: 2 + if (OBFS){ + Return (Buffer () {0,0,0,0,0,0,0,0,0,0,0,8,0,0,0,0}) // OBFF capable, offset 4[08h] + } else { + Return (Buffer () {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}) + } + } + } + // + // Function Index: 6 + // LTR Extended Capability Structure + // + Case(6) { + if (LEqual(Arg1, 2)){ // test Arg1 for Revision ID: 2 + if (LTRS){ + Store(And(ShiftRight(SMSL,10),7), Index(LTRV, 0)) + Store(And(SMSL,0x3FF), Index(LTRV, 1)) + Store(And(ShiftRight(SNSL,10),7), Index(LTRV, 2)) + Store(And(SNSL,0x3FF), Index(LTRV, 3)) + return (LTRV) + } else { + Return (0) + } + } + } + } // End of switch(Arg2) + } // End of case(ToUUID("E5C937D0-3553-4d7a-9117-EA4D19C3434D")) + } // End of switch(Arg0) + return (Buffer() {0x00}) + } // End of _DSM |