mirror of https://github.com/acidanthera/audk.git
72 lines
2.1 KiB
ArmAsm
72 lines
2.1 KiB
ArmAsm
#
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# Copyright (c) 2011, ARM Limited. All rights reserved.
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#
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# This program and the accompanying materials
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# are licensed and made available under the terms and conditions of the BSD License
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# which accompanies this distribution. The full text of the license may be found at
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# http:#opensource.org/licenses/bsd-license.php
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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#
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#include <AsmMacroIoLib.h>
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#include <Base.h>
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#include <Library/PcdLib.h>
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#include <AutoGen.h>
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#.include AsmMacroIoLib.inc
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#include <Chipset/ArmCortexA9.h>
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.text
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.align 2
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GCC_ASM_EXPORT(ArmGetCpuCountPerCluster)
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# IN None
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# OUT r0 = SCU Base Address
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ASM_PFX(ArmGetScuBaseAddress):
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# Read Configuration Base Address Register. ArmCBar cannot be called to get
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# the Configuration BAR as a stack is not necessary setup. The SCU is at the
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# offset 0x0000 from the Private Memory Region.
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mrc p15, 4, r0, c15, c0, 0
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bx lr
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# IN None
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# OUT r0 = number of cores present in the system
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ASM_PFX(ArmGetCpuCountPerCluster):
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stmfd SP!, {r1-r2}
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# Read CP15 MIDR
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mrc p15, 0, r1, c0, c0, 0
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# Check if the CPU is A15
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mov r1, r1, LSR #4
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LoadConstantToReg (ARM_CPU_TYPE_MASK, r0)
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and r1, r1, r0
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LoadConstantToReg (ARM_CPU_TYPE_A15, r0)
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cmp r1, r0
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beq _Read_cp15_reg
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_CPU_is_not_A15:
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mov r2, lr @ Save link register
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bl ArmGetScuBaseAddress @ Read SCU Base Address
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mov lr, r2 @ Restore link register val
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ldr r0, [r0, #A9_SCU_CONFIG_OFFSET] @ Read SCU Config reg to get CPU count
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b _Return
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_Read_cp15_reg:
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mrc p15, 1, r0, c9, c0, 2 @ Read C9 register of CP15 to get CPU count
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lsr r0, #24
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_Return:
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and r0, r0, #3
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# Add '1' to the number of CPU on the Cluster
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add r0, r0, #1
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ldmfd SP!, {r1-r2}
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bx lr
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ASM_FUNCTION_REMOVE_IF_UNREFERENCED
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