| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * Utility functions for FEL mode. |
| * |
| * Copyright (c) 2015 Google, Inc |
| */ |
| |
| #include <asm-offsets.h> |
| #include <config.h> |
| #include <asm/system.h> |
| #include <linux/linkage.h> |
| |
| ENTRY(save_boot_params) |
| ldr r0, =fel_stash |
| str sp, [r0, #0] |
| str lr, [r0, #4] |
| mrs lr, cpsr @ Read CPSR |
| str lr, [r0, #8] |
| mrc p15, 0, lr, c1, c0, 0 @ Read CP15 SCTLR Register |
| str lr, [r0, #12] |
| mrc p15, 0, lr, c12, c0, 0 @ Read VBAR |
| str lr, [r0, #16] |
| mrc p15, 0, lr, c1, c0, 0 @ Read CP15 Control Register |
| str lr, [r0, #20] |
| b save_boot_params_ret |
| ENDPROC(save_boot_params) |
| |
| ENTRY(return_to_fel) |
| mov sp, r0 |
| mov lr, r1 |
| ldr r0, =fel_stash |
| ldr r1, [r0, #20] |
| mcr p15, 0, r1, c1, c0, 0 @ Write CP15 Control Register |
| ldr r1, [r0, #16] |
| mcr p15, 0, r1, c12, c0, 0 @ Write VBAR |
| ldr r1, [r0, #12] |
| mcr p15, 0, r1, c1, c0, 0 @ Write CP15 SCTLR Register |
| ldr r1, [r0, #8] |
| msr cpsr, r1 @ Write CPSR |
| bx lr |
| ENDPROC(return_to_fel) |
