diff options
Diffstat (limited to 'arch/arm/cpu/lowlevel_64.S')
| -rw-r--r-- | arch/arm/cpu/lowlevel_64.S | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/arch/arm/cpu/lowlevel_64.S b/arch/arm/cpu/lowlevel_64.S new file mode 100644 index 0000000000..4850895169 --- /dev/null +++ b/arch/arm/cpu/lowlevel_64.S @@ -0,0 +1,40 @@ +#include <linux/linkage.h> +#include <init.h> +#include <asm/system.h> + +.section ".text_bare_init_","ax" +ENTRY(arm_cpu_lowlevel_init) + adr x0, vectors + mrs x1, CurrentEL + cmp x1, #0xC /* Check EL3 state */ + b.eq 1f + cmp x1, #0x8 /* Check EL2 state */ + b.eq 2f + cmp x1, #0x4 /* Check EL1 state */ + b.eq 3f + +1: + msr vbar_el3, x0 + mov x0, #1 /* Non-Secure EL0/1 */ + orr x0, x0, #(1 << 10) /* 64-bit EL2 */ + msr scr_el3, x0 + msr cptr_el3, xzr + b done + +2: + msr vbar_el2, x0 + mov x0, #0x33ff /* Enable FP/SIMD */ + msr cptr_el2, x0 + b done + + +3: + msr vbar_el1, x0 + mov x0, #(3 << 20) /* Enable FP/SIMD */ + msr cpacr_el1, x0 + b done + +done: + ret + +ENDPROC(arm_cpu_lowlevel_init) |