| /* |
| * Early initialization code for aarch64 (a.k.a. armv8) |
| * |
| * Copyright 2013 Google Inc. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License as |
| * published by the Free Software Foundation; version 2 of |
| * the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| * MA 02111-1307 USA |
| */ |
| |
| .section ".start", "a", %progbits |
| .globl _start |
| _start: b reset |
| .balignl 16,0xdeadbeef |
| |
| _cbfs_master_header: |
| /* The CBFS master header is inserted by cbfstool at the first |
| * aligned offset after the above anchor string is found. |
| * Hence, we leave some space for it. |
| * Assumes 64-byte alignment. |
| */ |
| .skip 128 |
| |
| reset: |
| /* |
| * Set the cpu to SVC32 mode and unmask aborts. Aborts might happen |
| * before logging is turned on and may crash the machine, but at least |
| * the problem will show up near the code that causes it. |
| */ |
| /* FIXME: Not using supervisor mode, does it apply for aarch64? */ |
| |
| msr daifclr, #0xc /* Unmask Debug and System exceptions */ |
| msr daifset, #0x3 /* Mask IRQ, FIQ */ |
| |
| bl arm_init_caches |
| |
| /* |
| * Initialize the stack to a known value. This is used to check for |
| * stack overflow later in the boot process. |
| */ |
| ldr x0, .Stack |
| ldr x1, .Stack_size |
| sub x0, x0, x1 |
| ldr x1, .Stack |
| ldr x2, =0xdeadbeefdeadbeef |
| init_stack_loop: |
| str x2, [x0] |
| add x0, x0, #8 |
| cmp x0, x1 |
| bne init_stack_loop |
| |
| /* Set stackpointer in internal RAM to call bootblock main() */ |
| call_bootblock: |
| ldr x0, .Stack /* Set up stack pointer */ |
| mov sp, x0 |
| ldr x0, =0x00000000 |
| |
| sub sp, sp, #16 |
| |
| /* |
| * Switch to EL2 already because Linux requires to be |
| * in EL1 or EL2, see its "Booting AArch64 Linux" doc |
| */ |
| bl switch_el3_to_el2 |
| bl main |
| |
| .align 3 |
| .Stack: |
| .word CONFIG_STACK_TOP |
| .align 3 |
| .Stack_size: |
| .word CONFIG_STACK_SIZE |
| .section ".id", "a", %progbits |
| |
| .globl __id_start |
| __id_start: |
| ver: |
| .asciz COREBOOT_VERSION |
| vendor: |
| .asciz CONFIG_MAINBOARD_VENDOR |
| part: |
| .asciz CONFIG_MAINBOARD_PART_NUMBER |
| .long __id_end - ver /* Reverse offset to the vendor id */ |
| .long __id_end - vendor /* Reverse offset to the vendor id */ |
| .long __id_end - part /* Reverse offset to the part number */ |
| .long CONFIG_ROM_SIZE /* Size of this romimage */ |
| .globl __id_end |
| |
| __id_end: |
| .previous |