| Achin Gupta | 4f6ad66 | 2013-10-25 09:08:21 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2013, ARM Limited. All rights reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions are met: |
| 6 | * |
| 7 | * Redistributions of source code must retain the above copyright notice, this |
| 8 | * list of conditions and the following disclaimer. |
| 9 | * |
| 10 | * Redistributions in binary form must reproduce the above copyright notice, |
| 11 | * this list of conditions and the following disclaimer in the documentation |
| 12 | * and/or other materials provided with the distribution. |
| 13 | * |
| 14 | * Neither the name of ARM nor the names of its contributors may be used |
| 15 | * to endorse or promote products derived from this software without specific |
| 16 | * prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 19 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| 22 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 23 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 24 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 25 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 26 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 27 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 28 | * POSSIBILITY OF SUCH DAMAGE. |
| 29 | */ |
| 30 | |
| 31 | #include <bl1.h> |
| 32 | #include <bl_common.h> |
| 33 | #include <platform.h> |
| 34 | |
| 35 | |
| 36 | .globl bl31_entrypoint |
| 37 | |
| 38 | |
| 39 | .section entry_code, "ax"; .align 3 |
| 40 | |
| 41 | /* ----------------------------------------------------- |
| 42 | * bl31_entrypoint() is the cold boot entrypoint, |
| 43 | * executed only by the primary cpu. |
| 44 | * ----------------------------------------------------- |
| 45 | */ |
| 46 | |
| 47 | bl31_entrypoint:; .type bl31_entrypoint, %function |
| 48 | /* --------------------------------------------- |
| 49 | * BL2 has populated x0,x3,x4 with the opcode |
| 50 | * indicating BL31 should be run, memory layout |
| 51 | * of the trusted SRAM available to BL31 and |
| 52 | * information about running the non-trusted |
| 53 | * software already loaded by BL2. Check the |
| 54 | * opcode out of paranoia. |
| 55 | * --------------------------------------------- |
| 56 | */ |
| 57 | mov x19, #RUN_IMAGE |
| 58 | cmp x0, x19 |
| 59 | b.ne _panic |
| 60 | mov x20, x3 |
| 61 | mov x21, x4 |
| 62 | |
| 63 | /* --------------------------------------------- |
| 64 | * This is BL31 which is expected to be executed |
| 65 | * only by the primary cpu (at least for now). |
| 66 | * So, make sure no secondary has lost its way. |
| 67 | * --------------------------------------------- |
| 68 | */ |
| 69 | bl read_mpidr |
| 70 | mov x19, x0 |
| 71 | bl platform_is_primary_cpu |
| 72 | cbz x0, _panic |
| 73 | |
| 74 | /* -------------------------------------------- |
| 75 | * Give ourselves a small coherent stack to |
| 76 | * ease the pain of initializing the MMU |
| 77 | * -------------------------------------------- |
| 78 | */ |
| 79 | mov x0, x19 |
| 80 | bl platform_set_coherent_stack |
| 81 | |
| 82 | /* --------------------------------------------- |
| 83 | * Perform platform specific early arch. setup |
| 84 | * --------------------------------------------- |
| 85 | */ |
| 86 | mov x0, x20 |
| 87 | mov x1, x21 |
| 88 | mov x2, x19 |
| 89 | bl bl31_early_platform_setup |
| 90 | bl bl31_plat_arch_setup |
| 91 | |
| 92 | /* --------------------------------------------- |
| 93 | * Give ourselves a stack allocated in Normal |
| 94 | * -IS-WBWA memory |
| 95 | * --------------------------------------------- |
| 96 | */ |
| 97 | mov x0, x19 |
| 98 | bl platform_set_stack |
| 99 | |
| 100 | /* --------------------------------------------- |
| 101 | * Use SP_EL0 to initialize BL31. It allows us |
| 102 | * to jump to the next image without having to |
| 103 | * come back here to ensure all of the stack's |
| 104 | * been popped out. run_image() is not nice |
| 105 | * enough to reset the stack pointer before |
| 106 | * handing control to the next stage. |
| 107 | * --------------------------------------------- |
| 108 | */ |
| 109 | mov x0, sp |
| 110 | msr sp_el0, x0 |
| 111 | msr spsel, #0 |
| 112 | isb |
| 113 | |
| 114 | /* --------------------------------------------- |
| 115 | * Jump to main function. |
| 116 | * --------------------------------------------- |
| 117 | */ |
| 118 | bl bl31_main |
| 119 | |
| 120 | _panic: |
| 121 | b _panic |