69 lines
2.2 KiB
ArmAsm
69 lines
2.2 KiB
ArmAsm
/*********************************************************************************/
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/* Module Name: boot.S */
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/* Project: AurixOS */
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/* */
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/* Copyright (c) 2024-2025 Jozef Nagy */
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/* */
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/* This source is subject to the MIT License. */
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/* See License.txt in the root of this repository. */
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/* All other rights reserved. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR */
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/* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, */
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/* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE */
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/* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER */
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/* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, */
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/* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE */
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/* SOFTWARE. */
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/*********************************************************************************/
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.section ".text.boot"
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.global _start
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_start:
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//
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// hello, am i on the main core?
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//
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mrs x1, mpidr_el1
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and x1, x1, #3
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cbz x1, 2f
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//
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// no? alright then, sorry for interrupting. *leaves*
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//
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1:
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wfe
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b 1b
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//
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// ok cool now execute this huge pile of horrible code
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// thanks :>
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//
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2:
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//
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// let the stack live below our code
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//
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ldr x1, =_start
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mov sp, x1
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//
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// no junk allowed in .bss!
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//
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ldr x1, =__bss_start
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ldr w2, =__bss_size
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3: cbz w2, 4f
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str xzr, [x1], #8
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sub w2, w2, #1
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cbnz w2, 3b
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4:
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bl axboot_init
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//
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// crazy? i was crazy once.
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// they locked me in a room. a rubber room. a rubber room with rats.
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// and rats make me crazy.
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// (bootloader returned, just halt the whole thing)
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//
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b 1b
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