| Furquan Shaikh | 2af76f4 | 2014-04-28 16:39:40 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Early initialization code for aarch64 (a.k.a. armv8) |
| 3 | * |
| 4 | * Copyright 2013 Google Inc. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License as |
| 8 | * published by the Free Software Foundation; version 2 of |
| 9 | * the License. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | * GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 19 | * MA 02111-1307 USA |
| 20 | */ |
| 21 | |
| 22 | .section ".start", "a", %progbits |
| 23 | .globl _start |
| 24 | _start: b reset |
| 25 | .balignl 16,0xdeadbeef |
| 26 | |
| 27 | _cbfs_master_header: |
| 28 | /* The CBFS master header is inserted by cbfstool at the first |
| 29 | * aligned offset after the above anchor string is found. |
| 30 | * Hence, we leave some space for it. |
| 31 | * Assumes 64-byte alignment. |
| 32 | */ |
| 33 | .skip 128 |
| 34 | |
| 35 | reset: |
| 36 | /* |
| 37 | * Set the cpu to SVC32 mode and unmask aborts. Aborts might happen |
| 38 | * before logging is turned on and may crash the machine, but at least |
| 39 | * the problem will show up near the code that causes it. |
| 40 | */ |
| 41 | /* FIXME: Not using supervisor mode, does it apply for aarch64? */ |
| 42 | |
| 43 | msr daifclr, #0xc /* Unmask Debug and System exceptions */ |
| 44 | msr daifset, #0x3 /* Mask IRQ, FIQ */ |
| 45 | |
| 46 | bl arm_init_caches |
| 47 | |
| 48 | /* |
| 49 | * Initialize the stack to a known value. This is used to check for |
| 50 | * stack overflow later in the boot process. |
| 51 | */ |
| 52 | ldr x0, .Stack |
| 53 | ldr x1, .Stack_size |
| 54 | sub x0, x0, x1 |
| 55 | ldr x1, .Stack |
| 56 | ldr x2, =0xdeadbeefdeadbeef |
| 57 | init_stack_loop: |
| 58 | str x2, [x0] |
| 59 | add x0, x0, #8 |
| 60 | cmp x0, x1 |
| 61 | bne init_stack_loop |
| 62 | |
| 63 | /* Set stackpointer in internal RAM to call bootblock main() */ |
| 64 | call_bootblock: |
| 65 | ldr x0, .Stack /* Set up stack pointer */ |
| 66 | mov sp, x0 |
| 67 | ldr x0, =0x00000000 |
| 68 | |
| 69 | sub sp, sp, #16 |
| 70 | |
| 71 | /* |
| 72 | * Switch to EL2 already because Linux requires to be |
| 73 | * in EL1 or EL2, see its "Booting AArch64 Linux" doc |
| 74 | */ |
| 75 | bl switch_el3_to_el2 |
| 76 | bl main |
| 77 | |
| 78 | .align 3 |
| 79 | .Stack: |
| 80 | .word CONFIG_STACK_TOP |
| 81 | .align 3 |
| 82 | .Stack_size: |
| 83 | .word CONFIG_STACK_SIZE |
| 84 | .section ".id", "a", %progbits |
| 85 | |
| 86 | .globl __id_start |
| 87 | __id_start: |
| 88 | ver: |
| 89 | .asciz COREBOOT_VERSION |
| 90 | vendor: |
| 91 | .asciz CONFIG_MAINBOARD_VENDOR |
| 92 | part: |
| 93 | .asciz CONFIG_MAINBOARD_PART_NUMBER |
| 94 | .long __id_end - ver /* Reverse offset to the vendor id */ |
| 95 | .long __id_end - vendor /* Reverse offset to the vendor id */ |
| 96 | .long __id_end - part /* Reverse offset to the part number */ |
| 97 | .long CONFIG_ROM_SIZE /* Size of this romimage */ |
| 98 | .globl __id_end |
| 99 | |
| 100 | __id_end: |
| 101 | .previous |