| /* |
| * Copyright (c) 2018 Foundries.io Ltd |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <zephyr/offsets.h> |
| #include <zephyr/toolchain.h> |
| |
| #include <soc.h> |
| |
| /* Exports */ |
| GTEXT(__soc_handle_irq) |
| #ifdef CONFIG_RISCV_SOC_CONTEXT_SAVE |
| GTEXT(__soc_save_context) |
| GTEXT(__soc_restore_context) |
| #endif |
| |
| /* |
| * With a0 == irq_num, this is equivalent to: |
| * |
| * EVENT_UNIT->INTPTPENDCLEAR = (1U << irq_num); |
| * |
| * We could write this routine in C, but the assembly |
| * that's calling us requires that a0 still contain irq_num |
| * on return, and assuming nobody would ever change a |
| * C implementation in a way that silently clobbers it |
| * is playing with fire. Instead, we play tricks in |
| * soc_context.h so that offsets.h contains a pointer to |
| * INTPTPENDCLEAR. |
| */ |
| SECTION_FUNC(exception.other, __soc_handle_irq) |
| la t0, __EVENT_INTPTPENDCLEAR |
| li t1, 1 |
| sll t1, t1, a0 |
| sw t1, 0x00(t0) |
| ret |
| |
| #ifdef CONFIG_RISCV_SOC_CONTEXT_SAVE |
| /* |
| * The RI5CY core has ISA extensions for faster loop performance |
| * that use extra registers. |
| * |
| * If the toolchain generates instructions that use them, they must be saved |
| * prior to handling an interrupt/exception. This case is handled using |
| * Zephyr's generic RISC-V mechanism for soc-specific context. |
| * |
| * For details, see the Kconfig help for CONFIG_RISCV_SOC_CONTEXT_SAVE. |
| */ |
| SECTION_FUNC(exception.other, __soc_save_context) |
| #ifdef CONFIG_SOC_OPENISA_RV32M1_RI5CY |
| csrr t0, RI5CY_LPSTART0 |
| csrr t1, RI5CY_LPEND0 |
| csrr t2, RI5CY_LPCOUNT0 |
| sw t0, __soc_esf_t_lpstart0_OFFSET(a0) |
| sw t1, __soc_esf_t_lpend0_OFFSET(a0) |
| sw t2, __soc_esf_t_lpcount0_OFFSET(a0) |
| csrr t0, RI5CY_LPSTART1 |
| csrr t1, RI5CY_LPEND1 |
| csrr t2, RI5CY_LPCOUNT1 |
| sw t0, __soc_esf_t_lpstart1_OFFSET(a0) |
| sw t1, __soc_esf_t_lpend1_OFFSET(a0) |
| sw t2, __soc_esf_t_lpcount1_OFFSET(a0) |
| #endif /* CONFIG_SOC_OPENISA_RV32M1_RI5CY */ |
| |
| ret |
| |
| SECTION_FUNC(exception.other, __soc_restore_context) |
| #ifdef CONFIG_SOC_OPENISA_RV32M1_RI5CY |
| lw t0, __soc_esf_t_lpstart0_OFFSET(a0) |
| lw t1, __soc_esf_t_lpend0_OFFSET(a0) |
| lw t2, __soc_esf_t_lpcount0_OFFSET(a0) |
| csrw RI5CY_LPSTART0, t0 |
| csrw RI5CY_LPEND0, t1 |
| csrw RI5CY_LPCOUNT0, t2 |
| lw t0, __soc_esf_t_lpstart1_OFFSET(a0) |
| lw t1, __soc_esf_t_lpend1_OFFSET(a0) |
| lw t2, __soc_esf_t_lpcount1_OFFSET(a0) |
| csrw RI5CY_LPSTART1, t0 |
| csrw RI5CY_LPEND1, t1 |
| csrw RI5CY_LPCOUNT1, t2 |
| #endif /* CONFIG_SOC_OPENISA_RV32M1_RI5CY */ |
| |
| ret |
| #endif /* CONFIG_RISCV_SOC_CONTEXT_SAVE */ |
