87 lines
1.7 KiB
ArmAsm
87 lines
1.7 KiB
ArmAsm
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/*
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* arch/arm/common/mcpm_head.S -- kernel entry point for multi-cluster PM
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*
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* Created by: Nicolas Pitre, March 2012
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* Copyright: (C) 2012-2013 Linaro Limited
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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#include <asm/mcpm.h>
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.macro pr_dbg string
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#if defined(CONFIG_DEBUG_LL) && defined(DEBUG)
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b 1901f
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1902: .asciz "CPU"
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1903: .asciz " cluster"
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1904: .asciz ": \string"
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.align
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1901: adr r0, 1902b
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bl printascii
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mov r0, r9
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bl printhex8
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adr r0, 1903b
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bl printascii
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mov r0, r10
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bl printhex8
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adr r0, 1904b
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bl printascii
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#endif
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.endm
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.arm
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.align
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ENTRY(mcpm_entry_point)
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THUMB( adr r12, BSYM(1f) )
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THUMB( bx r12 )
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THUMB( .thumb )
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1:
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mrc p15, 0, r0, c0, c0, 5 @ MPIDR
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ubfx r9, r0, #0, #8 @ r9 = cpu
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ubfx r10, r0, #8, #8 @ r10 = cluster
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mov r3, #MAX_CPUS_PER_CLUSTER
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mla r4, r3, r10, r9 @ r4 = canonical CPU index
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cmp r4, #(MAX_CPUS_PER_CLUSTER * MAX_NR_CLUSTERS)
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blo 2f
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/* We didn't expect this CPU. Try to cheaply make it quiet. */
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1: wfi
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wfe
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b 1b
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2: pr_dbg "kernel mcpm_entry_point\n"
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/*
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* MMU is off so we need to get to mcpm_entry_vectors in a
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* position independent way.
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*/
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adr r5, 3f
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ldr r6, [r5]
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add r6, r5, r6 @ r6 = mcpm_entry_vectors
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mcpm_entry_gated:
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ldr r5, [r6, r4, lsl #2] @ r5 = CPU entry vector
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cmp r5, #0
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wfeeq
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beq mcpm_entry_gated
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pr_dbg "released\n"
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bx r5
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.align 2
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3: .word mcpm_entry_vectors - .
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ENDPROC(mcpm_entry_point)
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.bss
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.align 5
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.type mcpm_entry_vectors, #object
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ENTRY(mcpm_entry_vectors)
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.space 4 * MAX_NR_CLUSTERS * MAX_CPUS_PER_CLUSTER
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