[deliverable/linux.git] / arch / arm / mach-bcm / bcm_kona_smc_asm.S

/*
 * Copyright (C) 2013 Broadcom Corporation
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/linkage.h>
#include "bcm_kona_smc.h"

/*
 * int bcm_kona_smc_asm(u32 service_id, u32 buffer_addr)
 */

ENTRY(bcm_kona_smc_asm)
	stmfd	sp!, {r4-r12, lr}
	mov	r4, r0		@ service_id
	mov	r5, #3		@ Keep IRQ and FIQ off in SM
	/*
	 * Since interrupts are disabled in the open mode, we must keep
	 * interrupts disabled in secure mode by setting R5=0x3. If interrupts
	 * are enabled in open mode, we can set R5=0x0 to allow interrupts in
	 * secure mode.  If we did this, the secure monitor would return back
	 * control to the open mode to handle the interrupt prior to completing
	 * the secure service. If this happened, R12 would not be
	 * SEC_EXIT_NORMAL and we would need to call SMC again after resetting
	 * R5 (it gets clobbered by the secure monitor) and setting R4 to
	 * SSAPI_RET_FROM_INT_SERV to indicate that we want the secure monitor
	 * to finish up the previous uncompleted secure service.
	 */
	mov	r6, r1		@ buffer_addr
	smc	#0
	/* Check r12 for SEC_EXIT_NORMAL here if interrupts are enabled */
	ldmfd	sp!, {r4-r12, pc}
ENDPROC(bcm_kona_smc_asm)
Commit	Line	Data
b8eb35fd CD	1	/*
	2	* Copyright (C) 2013 Broadcom Corporation
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License as
	6	* published by the Free Software Foundation version 2.
	7	*
	8	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	9	* kind, whether express or implied; without even the implied warranty
	10	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*/
	13
	14	#include <linux/linkage.h>
	15	#include "bcm_kona_smc.h"
	16
	17	/*
	18	* int bcm_kona_smc_asm(u32 service_id, u32 buffer_addr)
	19	*/
	20
	21	ENTRY(bcm_kona_smc_asm)
	22	stmfd sp!, {r4-r12, lr}
	23	mov r4, r0 @ service_id
	24	mov r5, #3 @ Keep IRQ and FIQ off in SM
	25	/*
	26	* Since interrupts are disabled in the open mode, we must keep
	27	* interrupts disabled in secure mode by setting R5=0x3. If interrupts
	28	* are enabled in open mode, we can set R5=0x0 to allow interrupts in
	29	* secure mode. If we did this, the secure monitor would return back
	30	* control to the open mode to handle the interrupt prior to completing
	31	* the secure service. If this happened, R12 would not be
	32	* SEC_EXIT_NORMAL and we would need to call SMC again after resetting
	33	* R5 (it gets clobbered by the secure monitor) and setting R4 to
	34	* SSAPI_RET_FROM_INT_SERV to indicate that we want the secure monitor
	35	* to finish up the previous uncompleted secure service.
	36	*/
	37	mov r6, r1 @ buffer_addr
	38	smc #0
	39	/* Check r12 for SEC_EXIT_NORMAL here if interrupts are enabled */
	40	ldmfd sp!, {r4-r12, pc}
	41	ENDPROC(bcm_kona_smc_asm)