uboot下ARMV8 lowlevel_init

lowlevel_init:

#include #include #include

ENTRY(lowlevel_init)  /*   * Setup a temporary stack. Global data is not available yet.   */ #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK)  ldr w0, =CONFIG_SPL_STACK #else  ldr w0, =CONFIG_SYS_INIT_SP_ADDR #endif  bic sp, x0, #0xf /* 16-byte alignment for ABI compliance */

 /*   * Save the old LR(passed in x29) and the current LR to stack   */  stp x29, x30, [sp, #-16]!

 /*   * Call the very early init function. This should do only the   * absolute bare minimum to get started. It should not:   *   * - set up DRAM   * - use global_data   * - clear BSS   * - try to start a console   *   * For boards with SPL this should be empty since SPL can do all of   * this init in the SPL board_init_f() function which is called   * immediately after this.   */  bl s_init  ldp x29, x30, [sp]  ret ENDPROC(lowlevel_init)