1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 2019 Fraunhofer AISEC,
4 * Lukas Auer <lukas.auer@aisec.fraunhofer.de>
7 #ifndef _ASM_RISCV_SMP_H
8 #define _ASM_RISCV_SMP_H
11 * struct ipi_data - Inter-processor interrupt (IPI) data structure
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).
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.
21 * @addr: Address of function
22 * @arg0: First argument of function
23 * @arg1: Second argument of function
32 * handle_ipi() - interrupt handler for software interrupts
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.
37 * @hart: Hart ID of the current hart
39 void handle_ipi(ulong hart);
42 * smp_call_function() - Call a function on all other harts
44 * Send IPIs with the specified function call to all harts.
46 * @addr: Address of function
47 * @arg0: First argument of function
48 * @arg1: Second argument of function
49 * @wait: Wait for harts to acknowledge request
50 * @return 0 if OK, -ve on error
52 int smp_call_function(ulong addr, ulong arg0, ulong arg1, int wait);
55 * riscv_init_ipi() - Initialize inter-process interrupt (IPI) driver
57 * Platform code must provide this function. This function is called once after
58 * the cpu driver is initialized. No other riscv_*_ipi() calls will be made
59 * before this function is called.
61 * @return 0 if OK, -ve on error
63 int riscv_init_ipi(void);
66 * riscv_send_ipi() - Send inter-processor interrupt (IPI)
68 * Platform code must provide this function.
70 * @hart: Hart ID of receiving hart
71 * @return 0 if OK, -ve on error
73 int riscv_send_ipi(int hart);
76 * riscv_clear_ipi() - Clear inter-processor interrupt (IPI)
78 * Platform code must provide this function.
80 * @hart: Hart ID of hart to be cleared
81 * @return 0 if OK, -ve on error
83 int riscv_clear_ipi(int hart);
86 * riscv_get_ipi() - Get status of inter-processor interrupt (IPI)
88 * Platform code must provide this function.
90 * @hart: Hart ID of hart to be checked
91 * @pending: Pointer to variable with result of the check,
92 * 1 if IPI is pending, 0 otherwise
93 * @return 0 if OK, -ve on error
95 int riscv_get_ipi(int hart, int *pending);