[deliverable/linux.git] / arch / mips / kernel / machine_kexec.c

/*
 * machine_kexec.c for kexec
 * Created by <nschichan@corp.free.fr> on Thu Oct 12 15:15:06 2006
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2.  See the file COPYING for more details.
 */
#include <linux/compiler.h>
#include <linux/kexec.h>
#include <linux/mm.h>
#include <linux/delay.h>

#include <asm/cacheflush.h>
#include <asm/page.h>

extern const unsigned char relocate_new_kernel[];
extern const size_t relocate_new_kernel_size;

extern unsigned long kexec_start_address;
extern unsigned long kexec_indirection_page;

int (*_machine_kexec_prepare)(struct kimage *) = NULL;
void (*_machine_kexec_shutdown)(void) = NULL;
void (*_machine_crash_shutdown)(struct pt_regs *regs) = NULL;
#ifdef CONFIG_SMP
void (*relocated_kexec_smp_wait) (void *);
atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
void (*_crash_smp_send_stop)(void) = NULL;
#endif

int
machine_kexec_prepare(struct kimage *kimage)
{
	if (_machine_kexec_prepare)
		return _machine_kexec_prepare(kimage);
	return 0;
}

void
machine_kexec_cleanup(struct kimage *kimage)
{
}

void
machine_shutdown(void)
{
	if (_machine_kexec_shutdown)
		_machine_kexec_shutdown();
}

void
machine_crash_shutdown(struct pt_regs *regs)
{
	if (_machine_crash_shutdown)
		_machine_crash_shutdown(regs);
	else
		default_machine_crash_shutdown(regs);
}

typedef void (*noretfun_t)(void) __noreturn;

void
machine_kexec(struct kimage *image)
{
	unsigned long reboot_code_buffer;
	unsigned long entry;
	unsigned long *ptr;

	reboot_code_buffer =
	  (unsigned long)page_address(image->control_code_page);

	kexec_start_address =
		(unsigned long) phys_to_virt(image->start);

	if (image->type == KEXEC_TYPE_DEFAULT) {
		kexec_indirection_page =
			(unsigned long) phys_to_virt(image->head & PAGE_MASK);
	} else {
		kexec_indirection_page = (unsigned long)&image->head;
	}

	memcpy((void*)reboot_code_buffer, relocate_new_kernel,
	       relocate_new_kernel_size);

	/*
	 * The generic kexec code builds a page list with physical
	 * addresses. they are directly accessible through KSEG0 (or
	 * CKSEG0 or XPHYS if on 64bit system), hence the
	 * phys_to_virt() call.
	 */
	for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
	     ptr = (entry & IND_INDIRECTION) ?
	       phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
		if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
		    *ptr & IND_DESTINATION)
			*ptr = (unsigned long) phys_to_virt(*ptr);
	}

	/*
	 * we do not want to be bothered.
	 */
	local_irq_disable();

	printk("Will call new kernel at %08lx\n", image->start);
	printk("Bye ...\n");
	__flush_cache_all();
#ifdef CONFIG_SMP
	/* All secondary cpus now may jump to kexec_wait cycle */
	relocated_kexec_smp_wait = reboot_code_buffer +
		(void *)(kexec_smp_wait - relocate_new_kernel);
	smp_wmb();
	atomic_set(&kexec_ready_to_reboot, 1);
#endif
	((noretfun_t) reboot_code_buffer)();
}
Commit	Line	Data
583bb86f NS	1	/*
	2	* machine_kexec.c for kexec
	3	* Created by <nschichan@corp.free.fr> on Thu Oct 12 15:15:06 2006
	4	*
	5	* This source code is licensed under the GNU General Public License,
	6	* Version 2. See the file COPYING for more details.
	7	*/
7aa1c8f4	8	#include <linux/compiler.h>
583bb86f NS	9	#include <linux/kexec.h>
	10	#include <linux/mm.h>
	11	#include <linux/delay.h>
	12
	13	#include <asm/cacheflush.h>
	14	#include <asm/page.h>
	15
c5a69d57	16	extern const unsigned char relocate_new_kernel[];
1065932f	17	extern const size_t relocate_new_kernel_size;
583bb86f NS	18
	19	extern unsigned long kexec_start_address;
	20	extern unsigned long kexec_indirection_page;
	21
7aa1c8f4 RB	22	int (_machine_kexec_prepare)(struct kimage ) = NULL;
	23	void (*_machine_kexec_shutdown)(void) = NULL;
	24	void (_machine_crash_shutdown)(struct pt_regs regs) = NULL;
	25	#ifdef CONFIG_SMP
	26	void (relocated_kexec_smp_wait) (void );
	27	atomic_t kexec_ready_to_reboot = ATOMIC_INIT(0);
2f7c1225	28	void (*_crash_smp_send_stop)(void) = NULL;
7aa1c8f4 RB	29	#endif
7aa1c8f4 RB	30
583bb86f NS	31	int
	32	machine_kexec_prepare(struct kimage *kimage)
	33	{
7aa1c8f4 RB	34	if (_machine_kexec_prepare)
7aa1c8f4 RB	35	return _machine_kexec_prepare(kimage);
583bb86f NS	36	return 0;
	37	}
	38
	39	void
	40	machine_kexec_cleanup(struct kimage *kimage)
	41	{
	42	}
	43
	44	void
	45	machine_shutdown(void)
	46	{
7aa1c8f4 RB	47	if (_machine_kexec_shutdown)
7aa1c8f4 RB	48	_machine_kexec_shutdown();
583bb86f NS	49	}
	50
	51	void
	52	machine_crash_shutdown(struct pt_regs *regs)
	53	{
7aa1c8f4 RB	54	if (_machine_crash_shutdown)
	55	_machine_crash_shutdown(regs);
	56	else
	57	default_machine_crash_shutdown(regs);
583bb86f NS	58	}
583bb86f NS	59
7aa1c8f4	60	typedef void (*noretfun_t)(void) __noreturn;
1065932f	61
583bb86f NS	62	void
	63	machine_kexec(struct kimage *image)
	64	{
	65	unsigned long reboot_code_buffer;
	66	unsigned long entry;
	67	unsigned long *ptr;
	68
	69	reboot_code_buffer =
	70	(unsigned long)page_address(image->control_code_page);
	71
7aa1c8f4 RB	72	kexec_start_address =
	73	(unsigned long) phys_to_virt(image->start);
	74
91ffaa27 YW	75	if (image->type == KEXEC_TYPE_DEFAULT) {
	76	kexec_indirection_page =
	77	(unsigned long) phys_to_virt(image->head & PAGE_MASK);
	78	} else {
	79	kexec_indirection_page = (unsigned long)&image->head;
	80	}
583bb86f NS	81
	82	memcpy((void*)reboot_code_buffer, relocate_new_kernel,
	83	relocate_new_kernel_size);
	84
	85	/*
	86	* The generic kexec code builds a page list with physical
	87	* addresses. they are directly accessible through KSEG0 (or
	88	* CKSEG0 or XPHYS if on 64bit system), hence the
7aa1c8f4	89	* phys_to_virt() call.
583bb86f NS	90	*/
	91	for (ptr = &image->head; (entry = *ptr) && !(entry &IND_DONE);
	92	ptr = (entry & IND_INDIRECTION) ?
	93	phys_to_virt(entry & PAGE_MASK) : ptr + 1) {
	94	if (ptr & IND_SOURCE \|\| ptr & IND_INDIRECTION \|\|
	95	*ptr & IND_DESTINATION)
1065932f	96	ptr = (unsigned long) phys_to_virt(ptr);
583bb86f NS	97	}
	98
	99	/*
	100	* we do not want to be bothered.
	101	*/
	102	local_irq_disable();
	103
1065932f	104	printk("Will call new kernel at %08lx\n", image->start);
583bb86f	105	printk("Bye ...\n");
97ce9a8d	106	__flush_cache_all();
7aa1c8f4 RB	107	#ifdef CONFIG_SMP
	108	/* All secondary cpus now may jump to kexec_wait cycle */
	109	relocated_kexec_smp_wait = reboot_code_buffer +
	110	(void *)(kexec_smp_wait - relocate_new_kernel);
	111	smp_wmb();
	112	atomic_set(&kexec_ready_to_reboot, 1);
	113	#endif
1065932f	114	((noretfun_t) reboot_code_buffer)();
583bb86f	115	}