42 lines
652 B
ArmAsm
42 lines
652 B
ArmAsm
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#include "aarch64_reg.h"
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.globl _start
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_start:
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mrs x0, mpidr_el1 /* Check CPU ID */
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mov x1, 0xC1000000
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bic x0, x0, x1
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cbz x0, set_el
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idle:
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b idle
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set_el:
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/* check current exception level */
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bl aarch64_get_el
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cmp x0, 0x03
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bne set_stack
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/* set SCTRL_EL1 */
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ldr x0, =SCTLR_VALUE_MMU_DISABLED
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msr sctlr_el1, x0
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/* set HCR_EL2 */
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ldr x0, =HCR_VALUE
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msr hcr_el2, x0
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/* set SCR_EL3 */
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ldr x0, =SCR_VALUE
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msr scr_el3, x0
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/* set SPSR_EL3 */
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ldr x0, =SPSR_VALUE
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msr spsr_el3, x0
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/* set elr_el3 */
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adr x0, set_stack
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msr elr_el3, x0
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eret
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set_stack:
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ldr x30, =stack_ptr /* defined in aarch64.ld */
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mov sp, x30
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bl k_main
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