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 <AsmMacroIoLibV8.h> 16 #include <Library/ArmLib.h> 17 18 .text 19 .align 3 20 21 GCC_ASM_EXPORT(ArmPlatformPeiBootAction) 22 GCC_ASM_EXPORT(ArmPlatformGetCorePosition) 23 GCC_ASM_EXPORT(ArmPlatformGetPrimaryCoreMpId) 24 GCC_ASM_EXPORT(ArmPlatformIsPrimaryCore) 25 26 GCC_ASM_IMPORT(_gPcd_FixedAtBuild_PcdArmPrimaryCoreMask) 27 28 29 PrimaryCoreMpid: .word 0x0 30 31 // 32 // Return the core position from the value of its MpId register 33 // 34 // This function returns the core position from the position 0 in the processor. 35 // This function might be called from assembler before any stack is set. 36 // 37 // @return Return the core position 38 // 39 //UINTN 40 //ArmPlatformGetCorePosition ( 41 // IN UINTN MpId 42 // ); 43 // With this function: CorePos = (ClusterId * 2) + CoreId 44 ASM_PFX(ArmPlatformGetCorePosition): 45 and r1, r0, #ARM_CORE_MASK 46 and r0, r0, #ARM_CLUSTER_MASK 47 add r0, r1, r0, LSR #7 48 bx lr 49 50 // 51 // Return the MpId of the primary core 52 // 53 // This function returns the MpId of the primary core. 54 // This function might be called from assembler before any stack is set. 55 // 56 // @return Return the MpId of the primary core 57 // 58 //UINTN 59 //ArmPlatformGetPrimaryCoreMpId ( 60 // VOID 61 // ); 62 ASM_PFX(ArmPlatformGetPrimaryCoreMpId): 63 ldr r0, =PrimaryCoreMpid 64 ldr r0, [r0] 65 bx lr 66 67 // 68 // Return a non-zero value if the callee is the primary core 69 // 70 // This function returns a non-zero value if the callee is the primary core. 71 // The primary core is the core responsible to initialize the hardware and run UEFI. 72 // This function might be called from assembler before any stack is set. 73 // 74 // @return Return a non-zero value if the callee is the primary core. 75 // 76 //UINTN 77 //ArmPlatformIsPrimaryCore ( 78 // IN UINTN MpId 79 // ); 80 ASM_PFX(ArmPlatformIsPrimaryCore): 81 LoadConstantToReg (_gPcd_FixedAtBuild_PcdArmPrimaryCoreMask, r1) 82 ldr r1, [r1] 83 and r0, r0, r1 84 85 ldr r1, =PrimaryCoreMpid 86 ldr r1, [r1] 87 88 cmp r0, r1 89 moveq r0, #1 90 movne r0, #0 91 bx lr 92 93 // 94 // First platform specific function to be called in the PEI phase 95 // 96 // This function is actually the first function called by the PrePi 97 // or PrePeiCore modules. It allows to retrieve arguments passed to 98 // the UEFI firmware through the CPU registers. 99 // 100 ASM_PFX(ArmPlatformPeiBootAction): 101 // The trusted firmware passes the primary CPU MPID through r0 register. 102 // Save it in a variable. 103 ldr r1, =PrimaryCoreMpid 104 str r0, [r1] 105 bx lr 106
