diff options
Diffstat (limited to 'src/arch/arm64/armv8/bootblock.S')
| -rw-r--r-- | src/arch/arm64/armv8/bootblock.S | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/src/arch/arm64/armv8/bootblock.S b/src/arch/arm64/armv8/bootblock.S new file mode 100644 index 0000000000..e65515f20b --- /dev/null +++ b/src/arch/arm64/armv8/bootblock.S @@ -0,0 +1,101 @@ +/* + * 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 |