Hi Peng,
On Tue, Jul 17, 2018 at 10:35 PM, Peng Fan peng.fan@nxp.com wrote:
Add helper functions to identify different armv8 variants.
Signed-off-by: Peng Fan peng.fan@nxp.com
arch/arm/include/asm/armv8/cpu.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) create mode 100644 arch/arm/include/asm/armv8/cpu.h
diff --git a/arch/arm/include/asm/armv8/cpu.h b/arch/arm/include/asm/armv8/cpu.h new file mode 100644 index 0000000000..40d54dc85a --- /dev/null +++ b/arch/arm/include/asm/armv8/cpu.h @@ -0,0 +1,26 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/*
- Copyright 2018 NXP
- */
+#define MIDR_PARTNUM_CORTEX_A35 0xD04 +#define MIDR_PARTNUM_CORTEX_A53 0xD03 +#define MIDR_PARTNUM_CORTEX_A72 0xD08 +#define MIDR_PARTNUM_SHIFT 0x4 +#define MIDR_PARTNUM_MASK (0xFFF << 0x4)
+static inline unsigned int read_midr(void) +{
unsigned long val;asm volatile("mrs %0, midr_el1" : "=r" (val));return val;+}
+#define is_cortex_a35() (((read_midr() & MIDR_PARTNUM_MASK) >> \
MIDR_PARTNUM_SHIFT) == MIDR_PARTNUM_CORTEX_A35)+#define is_cortex_a53() (((read_midr() & MIDR_PARTNUM_MASK) >> \
MIDR_PARTNUM_SHIFT) == MIDR_PARTNUM_CORTEX_A53)+#define is_cortex_a72() (((read_midr() & MIDR_PARTNUM_MASK) >>\
MIDR_PARTNUM_SHIFT) == MIDR_PARTNUM_CORTEX_A72)
This is not mx8 specific, so this header could be on a more common location.