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author | Youling Tang <tangyouling@loongson.cn> | 2022-10-12 11:36:19 +0300 |
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committer | Huacai Chen <chenhuacai@loongson.cn> | 2022-10-12 11:36:19 +0300 |
commit | 4a03b2ac06a5bcae29371866d9d11f5bfd4c9188 (patch) | |
tree | b4be8ab432c4fd77b484dbc4445de8a609444197 /arch/loongarch/include | |
parent | 2d2c395217d2233e752dbddcae3c5d94050b48c1 (diff) | |
download | linux-4a03b2ac06a5bcae29371866d9d11f5bfd4c9188.tar.xz |
LoongArch: Add kexec support
Add three new files, kexec.h, machine_kexec.c and relocate_kernel.S to
the LoongArch architecture, so as to add support for the kexec re-boot
mechanism (CONFIG_KEXEC) on LoongArch platforms.
Kexec supports loading vmlinux.elf in ELF format and vmlinux.efi in PE
format.
I tested kexec on LoongArch machines (Loongson-3A5000) and it works as
expected:
$ sudo kexec -l /boot/vmlinux.efi --reuse-cmdline
$ sudo kexec -e
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'arch/loongarch/include')
-rw-r--r-- | arch/loongarch/include/asm/kexec.h | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/kexec.h b/arch/loongarch/include/asm/kexec.h new file mode 100644 index 000000000000..cf95cd3eb2de --- /dev/null +++ b/arch/loongarch/include/asm/kexec.h @@ -0,0 +1,60 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * kexec.h for kexec + * + * Copyright (C) 2022 Loongson Technology Corporation Limited + */ + +#ifndef _ASM_KEXEC_H +#define _ASM_KEXEC_H + +#include <asm/stacktrace.h> +#include <asm/page.h> + +/* 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 + +/* The native architecture */ +#define KEXEC_ARCH KEXEC_ARCH_LOONGARCH + +static inline void crash_setup_regs(struct pt_regs *newregs, + struct pt_regs *oldregs) +{ + if (oldregs) + memcpy(newregs, oldregs, sizeof(*newregs)); + else + prepare_frametrace(newregs); +} + +#define ARCH_HAS_KIMAGE_ARCH + +struct kimage_arch { + unsigned long efi_boot; + unsigned long cmdline_ptr; + unsigned long systable_ptr; +}; + +typedef void (*do_kexec_t)(unsigned long efi_boot, + unsigned long cmdline_ptr, + unsigned long systable_ptr, + unsigned long start_addr, + unsigned long first_ind_entry); + +struct kimage; +extern const unsigned char relocate_new_kernel[]; +extern const size_t relocate_new_kernel_size; +extern void kexec_reboot(void); + +#ifdef CONFIG_SMP +extern atomic_t kexec_ready_to_reboot; +extern const unsigned char kexec_smp_wait[]; +#endif + +#endif /* !_ASM_KEXEC_H */ |