From fba8a8674f68a0628abae470dfcfbcb4a0d7a79e Mon Sep 17 00:00:00 2001 From: Nick Kossifidis Date: Mon, 19 Apr 2021 03:55:36 +0300 Subject: RISC-V: Add kexec support This patch adds support for kexec on RISC-V. On SMP systems it depends on HOTPLUG_CPU in order to be able to bring up all harts after kexec. It also needs a recent OpenSBI version that supports the HSM extension. I tested it on riscv64 QEMU on both an smp and a non-smp system. Signed-off-by: Nick Kossifidis Signed-off-by: Palmer Dabbelt --- arch/riscv/include/asm/kexec.h | 49 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 arch/riscv/include/asm/kexec.h (limited to 'arch/riscv/include/asm') diff --git a/arch/riscv/include/asm/kexec.h b/arch/riscv/include/asm/kexec.h new file mode 100644 index 000000000000..86e6e4922d1f --- /dev/null +++ b/arch/riscv/include/asm/kexec.h @@ -0,0 +1,49 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2019 FORTH-ICS/CARV + * Nick Kossifidis + */ + +#ifndef _RISCV_KEXEC_H +#define _RISCV_KEXEC_H + +#include /* For PAGE_SIZE */ + +/* Maximum physical address we can use pages from */ +#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL) + +/* Maximum address we can reach in physical address mode */ +#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL) + +/* Maximum address we can use for the control code buffer */ +#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL) + +/* Reserve a page for the control code buffer */ +#define KEXEC_CONTROL_PAGE_SIZE PAGE_SIZE + +#define KEXEC_ARCH KEXEC_ARCH_RISCV + +static inline void +crash_setup_regs(struct pt_regs *newregs, + struct pt_regs *oldregs) +{ + /* Dummy implementation for now */ +} + + +#define ARCH_HAS_KIMAGE_ARCH + +struct kimage_arch { + unsigned long fdt_addr; +}; + +const extern unsigned char riscv_kexec_relocate[]; +const extern unsigned int riscv_kexec_relocate_size; + +typedef void (*riscv_kexec_do_relocate)(unsigned long first_ind_entry, + unsigned long jump_addr, + unsigned long fdt_addr, + unsigned long hartid, + unsigned long va_pa_off); + +#endif -- cgit v1.2.3