2 // Copyright (c) 2013-2014, ARM Limited. All rights reserved.
4 // This program and the accompanying materials
5 // are licensed and made available under the terms and conditions of the BSD License
6 // which accompanies this distribution. The full text of the license may be found at
7 // http://opensource.org/licenses/bsd-license.php
9 // THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10 // WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
14 #include <AsmMacroIoLibV8.h>
16 // Register definitions used by GCC for GICv3 access.
17 // These are defined by ARMCC, so keep them in the GCC specific code for now.
18 #define ICC_SRE_EL2 S3_4_C12_C9_5
19 #define ICC_SRE_EL3 S3_6_C12_C12_5
20 #define ICC_CTLR_EL1 S3_0_C12_C12_4
21 #define ICC_CTLR_EL3 S3_6_C12_C12_4
22 #define ICC_PMR_EL1 S3_0_C4_C6_0
27 GCC_ASM_EXPORT(InitializeGicV3)
29 /* Initialize GICv3 to expose it as a GICv2 as UEFI does not support GICv3 yet */
30 ASM_PFX(InitializeGicV3):
31 // We have a GICv3. UEFI still uses the GICv2 mode. We must do enough setup
32 // to allow Linux to use GICv3 if it chooses.
34 // In order to setup NS side we need to enable it first.
39 // Enable SRE at EL3 and ICC_SRE_EL2 access
40 mov x0, #((1 << 3) | (1 << 0)) // Enable | SRE
46 // Enable SRE at EL2 and ICC_SRE_EL1 access..
52 // Configure CPU interface
58 // The MemoryMap view and Register view may not be consistent, So Set PMR again.
59 mov w1, #1 << 7 // allow NS access to GICC_PMR
63 // Remove the SCR.NS bit