| /* |
| * Copyright (c) 2016 Jean-Paul Etienne <fractalclone@gmail.com> |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <kernel_structs.h> |
| |
| /* exports */ |
| GTEXT(__start) |
| GTEXT(__reset) |
| |
| /* imports */ |
| GTEXT(_PrepC) |
| |
| #if CONFIG_INCLUDE_RESET_VECTOR |
| SECTION_FUNC(reset, __reset) |
| /* |
| * jump to __start |
| * use call opcode in case __start is far away. |
| * This will be dependent on linker.ld configuration. |
| */ |
| call __start |
| #endif /* CONFIG_INCLUDE_RESET_VECTOR */ |
| |
| /* use ABI name of registers for the sake of simplicity */ |
| |
| /* |
| * Remainder of asm-land initialization code before we can jump into |
| * the C domain |
| */ |
| SECTION_FUNC(TEXT, __start) |
| #ifdef CONFIG_INIT_STACKS |
| /* Pre-populate all bytes in _interrupt_stack with 0xAA */ |
| la t0, _interrupt_stack |
| li t1, CONFIG_ISR_STACK_SIZE |
| add t1, t1, t0 |
| |
| /* Populate _interrupt_stack with 0xaaaaaaaa */ |
| li t2, 0xaaaaaaaa |
| aa_loop: |
| sw t2, 0x00(t0) |
| addi t0, t0, 4 |
| blt t0, t1, aa_loop |
| #endif |
| |
| /* |
| * Initially, setup stack pointer to |
| * _interrupt_stack + CONFIG_ISR_STACK_SIZE |
| */ |
| la sp, _interrupt_stack |
| li t0, CONFIG_ISR_STACK_SIZE |
| add sp, sp, t0 |
| |
| /* |
| * Jump into C domain. _PrepC zeroes BSS, copies rw data into RAM, |
| * and then enters kernel _Cstart |
| */ |
| call _PrepC |
