| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * A lowlevel_init function that sets up the stack to call a C function to |
| * perform further init. |
| */ |
| |
| #include <asm-offsets.h> |
| #include <config.h> |
| #include <linux/linkage.h> |
| |
| 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) |
