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e53d28180d
This patch adds support for kdump, the kernel will reserve a region for the crash kernel and jump there on panic. In order for userspace tools (kexec-tools) to prepare the crash kernel kexec image, we also need to expose some information on /proc/iomem for the memory regions used by the kernel and for the region reserved for crash kernel. Note that on userspace the device tree is used to determine the system's memory layout so the "System RAM" on /proc/iomem is ignored. I tested this on riscv64 qemu and works as expected, you may test it by triggering a crash through /proc/sysrq_trigger: echo c > /proc/sysrq_trigger Signed-off-by: Nick Kossifidis <mick@ics.forth.gr> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2019 FORTH-ICS/CARV
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* Nick Kossifidis <mick@ics.forth.gr>
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*/
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#ifndef _RISCV_KEXEC_H
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#define _RISCV_KEXEC_H
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#include <asm/page.h> /* For PAGE_SIZE */
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/* Maximum physical address we can use pages from */
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#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
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/* Maximum address we can reach in physical address mode */
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#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
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/* Maximum address we can use for the control code buffer */
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#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
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/* Reserve a page for the control code buffer */
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#define KEXEC_CONTROL_PAGE_SIZE PAGE_SIZE
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#define KEXEC_ARCH KEXEC_ARCH_RISCV
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extern void riscv_crash_save_regs(struct pt_regs *newregs);
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static inline void
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crash_setup_regs(struct pt_regs *newregs,
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struct pt_regs *oldregs)
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{
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if (oldregs)
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memcpy(newregs, oldregs, sizeof(struct pt_regs));
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else
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riscv_crash_save_regs(newregs);
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}
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#define ARCH_HAS_KIMAGE_ARCH
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struct kimage_arch {
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unsigned long fdt_addr;
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};
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const extern unsigned char riscv_kexec_relocate[];
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const extern unsigned int riscv_kexec_relocate_size;
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typedef void (*riscv_kexec_method)(unsigned long first_ind_entry,
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unsigned long jump_addr,
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unsigned long fdt_addr,
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unsigned long hartid,
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unsigned long va_pa_off);
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extern riscv_kexec_method riscv_kexec_norelocate;
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#endif
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