42 lines
1.5 KiB
ArmAsm
42 lines
1.5 KiB
ArmAsm
/*
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* Copyright (C) 2013 Broadcom Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation version 2.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/linkage.h>
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#include "bcm_kona_smc.h"
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/*
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* int bcm_kona_smc_asm(u32 service_id, u32 buffer_addr)
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*/
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ENTRY(bcm_kona_smc_asm)
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stmfd sp!, {r4-r12, lr}
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mov r4, r0 @ service_id
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mov r5, #3 @ Keep IRQ and FIQ off in SM
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/*
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* Since interrupts are disabled in the open mode, we must keep
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* interrupts disabled in secure mode by setting R5=0x3. If interrupts
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* are enabled in open mode, we can set R5=0x0 to allow interrupts in
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* secure mode. If we did this, the secure monitor would return back
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* control to the open mode to handle the interrupt prior to completing
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* the secure service. If this happened, R12 would not be
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* SEC_EXIT_NORMAL and we would need to call SMC again after resetting
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* R5 (it gets clobbered by the secure monitor) and setting R4 to
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* SSAPI_RET_FROM_INT_SERV to indicate that we want the secure monitor
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* to finish up the previous uncompleted secure service.
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*/
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mov r6, r1 @ buffer_addr
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smc #0
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/* Check r12 for SEC_EXIT_NORMAL here if interrupts are enabled */
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ldmfd sp!, {r4-r12, pc}
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ENDPROC(bcm_kona_smc_asm)
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