diff options
| -rw-r--r-- | src/arch/arm/armv7/cpu.S | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/arch/arm/armv7/cpu.S b/src/arch/arm/armv7/cpu.S index 610659243d..c53119c8d1 100644 --- a/src/arch/arm/armv7/cpu.S +++ b/src/arch/arm/armv7/cpu.S @@ -23,6 +23,19 @@ * THIS FUNCTION MUST PRESERVE THE VALUE OF r10 */ +#if ENV_USER_SPACE +/* + * Empty macro for code running in userspace. Trying to manipulate the + * cache from userspace hangs the system. To run code at a privileged level, + * the userspace code needs to execute an API call to the privileged mode + * code. + */ +.macro dcache_apply_all crm + bx lr +.endm + +#else + .macro dcache_apply_all crm dsb mov r3, #-2 @ initialize level so that we start at 0 @@ -82,6 +95,8 @@ bx lr .endm +#endif /* ENV_USER_SPACE */ + /* * Bring an ARM processor we just gained control of (e.g. from IROM) into a * known state regarding caches/SCTLR. Completely cleans and invalidates |