| /* |
| * Copyright (c) 2020, 2021 Antony Pavlov <antonynpavlov@gmail.com> |
| * |
| * based on arch/riscv/core/swap.S |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <zephyr/toolchain.h> |
| #include <offsets_short.h> |
| #include <zephyr/arch/cpu.h> |
| #include <mips/regdef.h> |
| |
| /* |
| * unsigned int arch_swap(unsigned int key) |
| * |
| * Always called with interrupts locked |
| * key is stored in a0 register |
| */ |
| |
| GTEXT(arch_swap) |
| SECTION_FUNC(exception.other, arch_swap) |
| |
| /* Make a system call to perform context switch */ |
| syscall |
| |
| /* |
| * when thread is rescheduled, unlock irq and return. |
| * Restored register v0 contains IRQ lock state of thread. |
| */ |
| la k0, _kernel |
| |
| /* Get pointer to _kernel.current */ |
| lw k1, _kernel_offset_to_current(k0) |
| |
| /* Load return value of arch_swap function in register v0 */ |
| lw v0, _thread_offset_to_swap_return_value(k1) |
| |
| /* |
| * Unlock irq, following IRQ lock state in v0 register. |
| */ |
| mfc0 k0, CP0_STATUS |
| or k0, k0, a0 |
| mtc0 k0, CP0_STATUS |
| ehb |
| |
| /* Return */ |
| jr ra |
