diff options
Diffstat (limited to 'arch/arm/mach-bcm/bcm_kona_smc_asm.S')
| -rw-r--r-- | arch/arm/mach-bcm/bcm_kona_smc_asm.S | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/arch/arm/mach-bcm/bcm_kona_smc_asm.S b/arch/arm/mach-bcm/bcm_kona_smc_asm.S new file mode 100644 index 000000000000..a1608480d60d --- /dev/null +++ b/arch/arm/mach-bcm/bcm_kona_smc_asm.S @@ -0,0 +1,41 @@ +/* + * 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) |