1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * A lowlevel_init function that sets up the stack to call a C function to 4 * perform further init. 5 */ 6 7 #include <asm-offsets.h> 8 #include <config.h> 9 #include <linux/linkage.h> 10 11 ENTRY(lowlevel_init) 12 /* 13 * Setup a temporary stack. Global data is not available yet. 14 */ 15 #if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_STACK) 16 ldr w0, =CONFIG_SPL_STACK 17 #else 18 ldr w0, =CONFIG_SYS_INIT_SP_ADDR 19 #endif 20 bic sp, x0, #0xf /* 16-byte alignment for ABI compliance */ 21 22 /* 23 * Save the old LR(passed in x29) and the current LR to stack 24 */ 25 stp x29, x30, [sp, #-16]! 26 27 /* 28 * Call the very early init function. This should do only the 29 * absolute bare minimum to get started. It should not: 30 * 31 * - set up DRAM 32 * - use global_data 33 * - clear BSS 34 * - try to start a console 35 * 36 * For boards with SPL this should be empty since SPL can do all of 37 * this init in the SPL board_init_f() function which is called 38 * immediately after this. 39 */ 40 bl s_init 41 ldp x29, x30, [sp] 42 ret 43 ENDPROC(lowlevel_init) 44
