| Lukas Auer | 83d573d | 2019-03-17 19:28:32 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | /* |
| 3 | * Copyright (C) 2019 Fraunhofer AISEC, |
| 4 | * Lukas Auer <lukas.auer@aisec.fraunhofer.de> |
| 5 | */ |
| 6 | |
| 7 | #ifndef _ASM_RISCV_SMP_H |
| 8 | #define _ASM_RISCV_SMP_H |
| 9 | |
| 10 | /** |
| 11 | * struct ipi_data - Inter-processor interrupt (IPI) data structure |
| 12 | * |
| 13 | * IPIs are used for SMP support to communicate to other harts what function to |
| 14 | * call. Functions are in the form |
| 15 | * void (*addr)(ulong hart, ulong arg0, ulong arg1). |
| 16 | * |
| 17 | * The function address and the two arguments, arg0 and arg1, are stored in the |
| 18 | * IPI data structure. The hart ID is inserted by the hart handling the IPI and |
| 19 | * calling the function. |
| 20 | * |
| 21 | * @addr: Address of function |
| 22 | * @arg0: First argument of function |
| 23 | * @arg1: Second argument of function |
| 24 | */ |
| 25 | struct ipi_data { |
| 26 | ulong addr; |
| 27 | ulong arg0; |
| 28 | ulong arg1; |
| 29 | }; |
| 30 | |
| 31 | /** |
| 32 | * handle_ipi() - interrupt handler for software interrupts |
| 33 | * |
| 34 | * The IPI interrupt handler must be called to handle software interrupts. It |
| 35 | * calls the function specified in the hart's IPI data structure. |
| 36 | * |
| 37 | * @hart: Hart ID of the current hart |
| 38 | */ |
| 39 | void handle_ipi(ulong hart); |
| 40 | |
| 41 | /** |
| 42 | * smp_call_function() - Call a function on all other harts |
| 43 | * |
| 44 | * Send IPIs with the specified function call to all harts. |
| 45 | * |
| 46 | * @addr: Address of function |
| 47 | * @arg0: First argument of function |
| 48 | * @arg1: Second argument of function |
| 49 | * @return 0 if OK, -ve on error |
| 50 | */ |
| 51 | int smp_call_function(ulong addr, ulong arg0, ulong arg1); |
| 52 | |
| 53 | #endif |