uboot下ARMv8 EL切换

#include <asm-offsets.h>#include <config.h>#include <linux/linkage.h>#include <asm/macro.h>
ENTRY(armv8_switch_to_el2) switch_el x6, 1f, 0f, 0f0: cmp x5, #ES_TO_AARCH64 b.eq 2f /*  * When loading 32-bit kernel, it will jump  * to secure firmware again, and never return.  */ bl armv8_el2_to_aarch322: /*  * x4 is kernel entry point or switch_to_el1  * if CONFIG_ARMV8_SWITCH_TO_EL1 is defined.         * When running in EL2 now, jump to the  * address saved in x4.  */ br x41: armv8_switch_to_el2_m x4, x5, x6ENDPROC(armv8_switch_to_el2)
ENTRY(armv8_switch_to_el1) switch_el x6, 0f, 1f, 0f0: /* x4 is kernel entry point. When running in EL1  * now, jump to the address saved in x4.  */ br x41: armv8_switch_to_el1_m x4, x5, x6ENDPROC(armv8_switch_to_el1)
WEAK(armv8_el2_to_aarch32) retENDPROC(armv8_el2_to_aarch32)