kexec.h

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#ifndef __ASM_SH_KEXEC_H
#define __ASM_SH_KEXEC_H

#include <asm/ptrace.h>
#include <asm/string.h>

/*
 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
 * I.e. Maximum page that is mapped directly into kernel memory,
 * and kmap is not required.
 *
 * Someone correct me if FIXADDR_START - PAGEOFFSET is not the correct
 * calculation for the amount of memory directly mappable into the
 * kernel memory space.
 */

/* 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 TASK_SIZE

#define KEXEC_CONTROL_PAGE_SIZE 4096

/* The native architecture */
#define KEXEC_ARCH KEXEC_ARCH_SH

#ifdef CONFIG_KEXEC
/* arch/sh/kernel/machine_kexec.c */
void reserve_crashkernel(void);

static inline void crash_setup_regs(struct pt_regs *newregs,
                    struct pt_regs *oldregs)
{
    if (oldregs)
        memcpy(newregs, oldregs, sizeof(*newregs));
    else {
        __asm__ __volatile__ ("mov r0, %0" : "=r" (newregs->regs[0]));
        __asm__ __volatile__ ("mov r1, %0" : "=r" (newregs->regs[1]));
        __asm__ __volatile__ ("mov r2, %0" : "=r" (newregs->regs[2]));
        __asm__ __volatile__ ("mov r3, %0" : "=r" (newregs->regs[3]));
        __asm__ __volatile__ ("mov r4, %0" : "=r" (newregs->regs[4]));
        __asm__ __volatile__ ("mov r5, %0" : "=r" (newregs->regs[5]));
        __asm__ __volatile__ ("mov r6, %0" : "=r" (newregs->regs[6]));
        __asm__ __volatile__ ("mov r7, %0" : "=r" (newregs->regs[7]));
        __asm__ __volatile__ ("mov r8, %0" : "=r" (newregs->regs[8]));
        __asm__ __volatile__ ("mov r9, %0" : "=r" (newregs->regs[9]));
        __asm__ __volatile__ ("mov r10, %0" : "=r" (newregs->regs[10]));
        __asm__ __volatile__ ("mov r11, %0" : "=r" (newregs->regs[11]));
        __asm__ __volatile__ ("mov r12, %0" : "=r" (newregs->regs[12]));
        __asm__ __volatile__ ("mov r13, %0" : "=r" (newregs->regs[13]));
        __asm__ __volatile__ ("mov r14, %0" : "=r" (newregs->regs[14]));
        __asm__ __volatile__ ("mov r15, %0" : "=r" (newregs->regs[15]));

        __asm__ __volatile__ ("sts pr, %0" : "=r" (newregs->pr));
        __asm__ __volatile__ ("sts macl, %0" : "=r" (newregs->macl));
        __asm__ __volatile__ ("sts mach, %0" : "=r" (newregs->mach));

        __asm__ __volatile__ ("stc gbr, %0" : "=r" (newregs->gbr));
        __asm__ __volatile__ ("stc sr, %0" : "=r" (newregs->sr));

        newregs->pc = (unsigned long)current_text_addr();
    }
}
#else
static inline void reserve_crashkernel(void) { }
#endif /* CONFIG_KEXEC */

#endif /* __ASM_SH_KEXEC_H */