| /* |
| * 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) |
