#ifndef _X86_64_KEXEC_H

#define _X86_64_KEXEC_H

#include <linux/string.h>

#include <asm/page.h>

#include <asm/ptrace.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.

 *

 * So far x86_64 is limited to 40 physical address bits.

 */

/* Maximum physical address we can use pages from */

#define KEXEC_SOURCE_MEMORY_LIMIT      (0xFFFFFFFFFFUL)

/* Maximum address we can reach in physical address mode */

#define KEXEC_DESTINATION_MEMORY_LIMIT (0xFFFFFFFFFFUL)

/* Maximum address we can use for the control pages */

#define KEXEC_CONTROL_MEMORY_LIMIT     (0xFFFFFFFFFFUL)

/* Allocate one page for the pdp and the second for the code */

#define KEXEC_CONTROL_CODE_SIZE  (4096UL + 4096UL)

/* The native architecture */

#define KEXEC_ARCH KEXEC_ARCH_X86_64

#define MAX_NOTE_BYTES 1024

/*

 * Saving the registers of the cpu on which panic occured in

 * crash_kexec to save a valid sp. The registers of other cpus

 * will be saved in machine_crash_shutdown while shooting down them.

 */

static inline void crash_setup_regs(struct pt_regs *newregs,

						struct pt_regs *oldregs)

{

	if (oldregs)

		memcpy(newregs, oldregs, sizeof(*newregs));

	else {

		__asm__ __volatile__("movq %%rbx,%0" : "=m"(newregs->rbx));

		__asm__ __volatile__("movq %%rcx,%0" : "=m"(newregs->rcx));

		__asm__ __volatile__("movq %%rdx,%0" : "=m"(newregs->rdx));

		__asm__ __volatile__("movq %%rsi,%0" : "=m"(newregs->rsi));

		__asm__ __volatile__("movq %%rdi,%0" : "=m"(newregs->rdi));

		__asm__ __volatile__("movq %%rbp,%0" : "=m"(newregs->rbp));

		__asm__ __volatile__("movq %%rax,%0" : "=m"(newregs->rax));

		__asm__ __volatile__("movq %%rsp,%0" : "=m"(newregs->rsp));

		__asm__ __volatile__("movq %%r8,%0" : "=m"(newregs->r8));

		__asm__ __volatile__("movq %%r9,%0" : "=m"(newregs->r9));

		__asm__ __volatile__("movq %%r10,%0" : "=m"(newregs->r10));

		__asm__ __volatile__("movq %%r11,%0" : "=m"(newregs->r11));

		__asm__ __volatile__("movq %%r12,%0" : "=m"(newregs->r12));

		__asm__ __volatile__("movq %%r13,%0" : "=m"(newregs->r13));

		__asm__ __volatile__("movq %%r14,%0" : "=m"(newregs->r14));

		__asm__ __volatile__("movq %%r15,%0" : "=m"(newregs->r15));

		__asm__ __volatile__("movl %%ss, %%eax;" :"=a"(newregs->ss));

		__asm__ __volatile__("movl %%cs, %%eax;" :"=a"(newregs->cs));

		__asm__ __volatile__("pushfq; popq %0" :"=m"(newregs->eflags));

		newregs->rip = (unsigned long)current_text_addr();

	}

}

#endif /* _X86_64_KEXEC_H */