1 /** @file 2 * 3 * Copyright (c) 2013-2014, ARM Limited. All rights reserved. 4 * 5 * This program and the accompanying materials 6 * are licensed and made available under the terms and conditions of the BSD License 7 * which accompanies this distribution. The full text of the license may be found at 8 * http://opensource.org/licenses/bsd-license.php 9 * 10 * THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 * 13 **/ 14 15 #include <AsmMacroIoLib.h> 16 #include <Library/ArmLib.h> 17 18 // 19 // Return the core position from the value of its MpId register 20 // 21 // This function returns the core position from the position 0 in the processor. 22 // This function might be called from assembler before any stack is set. 23 // 24 // @return Return the core position 25 // 26 //UINTN 27 //ArmPlatformGetCorePosition ( 28 // IN UINTN MpId 29 // ); 30 // With this function: CorePos = (ClusterId * 2) + CoreId 31 ASM_FUNC(ArmPlatformGetCorePosition) 32 and r1, r0, #ARM_CORE_MASK 33 and r0, r0, #ARM_CLUSTER_MASK 34 add r0, r1, r0, LSR #7 35 bx lr 36 37 // 38 // Return the MpId of the primary core 39 // 40 // This function returns the MpId of the primary core. 41 // This function might be called from assembler before any stack is set. 42 // 43 // @return Return the MpId of the primary core 44 // 45 //UINTN 46 //ArmPlatformGetPrimaryCoreMpId ( 47 // VOID 48 // ); 49 ASM_FUNC(ArmPlatformGetPrimaryCoreMpId) 50 LDRL (r0, PrimaryCoreMpid) 51 bx lr 52 53 // 54 // Return a non-zero value if the callee is the primary core 55 // 56 // This function returns a non-zero value if the callee is the primary core. 57 // The primary core is the core responsible to initialize the hardware and run UEFI. 58 // This function might be called from assembler before any stack is set. 59 // 60 // @return Return a non-zero value if the callee is the primary core. 61 // 62 //UINTN 63 //ArmPlatformIsPrimaryCore ( 64 // IN UINTN MpId 65 // ); 66 ASM_FUNC(ArmPlatformIsPrimaryCore) 67 MOV32 (r1, FixedPcdGet32 (PcdArmPrimaryCoreMask)) 68 and r0, r0, r1 69 70 LDRL (r1, PrimaryCoreMpid) 71 72 cmp r0, r1 73 moveq r0, #1 74 movne r0, #0 75 bx lr 76 77 // 78 // First platform specific function to be called in the PEI phase 79 // 80 // This function is actually the first function called by the PrePi 81 // or PrePeiCore modules. It allows to retrieve arguments passed to 82 // the UEFI firmware through the CPU registers. 83 // 84 ASM_FUNC(ArmPlatformPeiBootAction) 85 // The trusted firmware passes the primary CPU MPID through r0 register. 86 // Save it in a variable. 87 adr r1, PrimaryCoreMpid 88 str r0, [r1] 89 bx lr 90 91 PrimaryCoreMpid: .word 0x0 92
