/* 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 */