diff options
Diffstat (limited to 'arch/arm/common/secure_cntvoff.S')
| -rw-r--r-- | arch/arm/common/secure_cntvoff.S | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/arch/arm/common/secure_cntvoff.S b/arch/arm/common/secure_cntvoff.S new file mode 100644 index 000000000..53fc7bdb6 --- /dev/null +++ b/arch/arm/common/secure_cntvoff.S @@ -0,0 +1,32 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2014 Renesas Electronics Corporation + * + * Initialization of CNTVOFF register from secure mode + * + */ + +#include <linux/linkage.h> +#include <asm/assembler.h> + +ENTRY(secure_cntvoff_init) + .arch armv7-a + /* + * CNTVOFF has to be initialized either from non-secure Hypervisor + * mode or secure Monitor mode with SCR.NS==1. If TrustZone is enabled + * then it should be handled by the secure code. The CPU must implement + * the virtualization extensions. + */ + cps #MON_MODE + mrc p15, 0, r1, c1, c1, 0 /* Get Secure Config */ + orr r0, r1, #1 + mcr p15, 0, r0, c1, c1, 0 /* Set Non Secure bit */ + isb + mov r0, #0 + mcrr p15, 4, r0, r0, c14 /* CNTVOFF = 0 */ + isb + mcr p15, 0, r1, c1, c1, 0 /* Set Secure bit */ + isb + cps #SVC_MODE + ret lr +ENDPROC(secure_cntvoff_init) |