diff options
| author | Peng Fan <[email protected]> | 2018-10-18 14:28:17 +0200 |
|---|---|---|
| committer | Stefano Babic <[email protected]> | 2018-10-22 12:59:01 +0200 |
| commit | fa64d8429b525f7db2e22ed67d1d3c682e89078c (patch) | |
| tree | 71e50d9a4d14e10545240b1d8f621444fd5480a9 | |
| parent | 5710a48afc0fbc5a90727404f1da1df52af99c46 (diff) | |
armv8: add cpu core helper functions
Add helper functions to identify different armv8 variants.
Signed-off-by: Peng Fan <[email protected]>
Reviewed-by: Anatolij Gustschin <[email protected]>
Cc: Stefano Babic <[email protected]>
| -rw-r--r-- | arch/arm/include/asm/armv8/cpu.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm/include/asm/armv8/cpu.h b/arch/arm/include/asm/armv8/cpu.h new file mode 100644 index 00000000000..40d54dc85ab --- /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) |