diff options
Diffstat (limited to 'arch/riscv/include')
| -rw-r--r-- | arch/riscv/include/asm/global_data.h | 6 | ||||
| -rw-r--r-- | arch/riscv/include/asm/smp.h | 53 |
2 files changed, 59 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/global_data.h b/arch/riscv/include/asm/global_data.h index a3a342c6e1..80e3165e39 100644 --- a/arch/riscv/include/asm/global_data.h +++ b/arch/riscv/include/asm/global_data.h @@ -10,12 +10,18 @@ #ifndef __ASM_GBL_DATA_H #define __ASM_GBL_DATA_H +#include <asm/smp.h> + /* Architecture-specific global data */ struct arch_global_data { long boot_hart; /* boot hart id */ #ifdef CONFIG_SIFIVE_CLINT void __iomem *clint; /* clint base address */ #endif +#ifdef CONFIG_SMP + struct ipi_data ipi[CONFIG_NR_CPUS]; +#endif + ulong available_harts; }; #include <asm-generic/global_data.h> diff --git a/arch/riscv/include/asm/smp.h b/arch/riscv/include/asm/smp.h new file mode 100644 index 0000000000..bc863fdbaf --- /dev/null +++ b/arch/riscv/include/asm/smp.h @@ -0,0 +1,53 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2019 Fraunhofer AISEC, + * Lukas Auer <lukas.auer@aisec.fraunhofer.de> + */ + +#ifndef _ASM_RISCV_SMP_H +#define _ASM_RISCV_SMP_H + +/** + * struct ipi_data - Inter-processor interrupt (IPI) data structure + * + * IPIs are used for SMP support to communicate to other harts what function to + * call. Functions are in the form + * void (*addr)(ulong hart, ulong arg0, ulong arg1). + * + * The function address and the two arguments, arg0 and arg1, are stored in the + * IPI data structure. The hart ID is inserted by the hart handling the IPI and + * calling the function. + * + * @addr: Address of function + * @arg0: First argument of function + * @arg1: Second argument of function + */ +struct ipi_data { + ulong addr; + ulong arg0; + ulong arg1; +}; + +/** + * handle_ipi() - interrupt handler for software interrupts + * + * The IPI interrupt handler must be called to handle software interrupts. It + * calls the function specified in the hart's IPI data structure. + * + * @hart: Hart ID of the current hart + */ +void handle_ipi(ulong hart); + +/** + * smp_call_function() - Call a function on all other harts + * + * Send IPIs with the specified function call to all harts. + * + * @addr: Address of function + * @arg0: First argument of function + * @arg1: Second argument of function + * @return 0 if OK, -ve on error + */ +int smp_call_function(ulong addr, ulong arg0, ulong arg1); + +#endif |