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/*
* 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
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