[net-next-2.6.git] / arch / x86 / kernel / machine_kexec_64.c

/*
 * handle transition of Linux booting another kernel
 * Copyright (C) 2002-2005 Eric Biederman  <ebiederm@xmission.com>
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2.  See the file COPYING for more details.
 */

#include <linux/mm.h>
#include <linux/kexec.h>
#include <linux/string.h>
#include <linux/reboot.h>
#include <linux/numa.h>
#include <linux/ftrace.h>
#include <linux/io.h>
#include <linux/suspend.h>

#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/mmu_context.h>

static int init_one_level2_page(struct kimage *image, pgd_t *pgd,
				unsigned long addr)
{
	pud_t *pud;
	pmd_t *pmd;
	struct page *page;
	int result = -ENOMEM;

	addr &= PMD_MASK;
	pgd += pgd_index(addr);
	if (!pgd_present(*pgd)) {
		page = kimage_alloc_control_pages(image, 0);
		if (!page)
			goto out;
		pud = (pud_t *)page_address(page);
		memset(pud, 0, PAGE_SIZE);
		set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE));
	}
	pud = pud_offset(pgd, addr);
	if (!pud_present(*pud)) {
		page = kimage_alloc_control_pages(image, 0);
		if (!page)
			goto out;
		pmd = (pmd_t *)page_address(page);
		memset(pmd, 0, PAGE_SIZE);
		set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
	}
	pmd = pmd_offset(pud, addr);
	if (!pmd_present(*pmd))
		set_pmd(pmd, __pmd(addr | __PAGE_KERNEL_LARGE_EXEC));
	result = 0;
out:
	return result;
}

static void init_level2_page(pmd_t *level2p, unsigned long addr)
{
	unsigned long end_addr;

	addr &= PAGE_MASK;
	end_addr = addr + PUD_SIZE;
	while (addr < end_addr) {
		set_pmd(level2p++, __pmd(addr | __PAGE_KERNEL_LARGE_EXEC));
		addr += PMD_SIZE;
	}
}

static int init_level3_page(struct kimage *image, pud_t *level3p,
				unsigned long addr, unsigned long last_addr)
{
	unsigned long end_addr;
	int result;

	result = 0;
	addr &= PAGE_MASK;
	end_addr = addr + PGDIR_SIZE;
	while ((addr < last_addr) && (addr < end_addr)) {
		struct page *page;
		pmd_t *level2p;

		page = kimage_alloc_control_pages(image, 0);
		if (!page) {
			result = -ENOMEM;
			goto out;
		}
		level2p = (pmd_t *)page_address(page);
		init_level2_page(level2p, addr);
		set_pud(level3p++, __pud(__pa(level2p) | _KERNPG_TABLE));
		addr += PUD_SIZE;
	}
	/* clear the unused entries */
	while (addr < end_addr) {
		pud_clear(level3p++);
		addr += PUD_SIZE;
	}
out:
	return result;
}


static int init_level4_page(struct kimage *image, pgd_t *level4p,
				unsigned long addr, unsigned long last_addr)
{
	unsigned long end_addr;
	int result;

	result = 0;
	addr &= PAGE_MASK;
	end_addr = addr + (PTRS_PER_PGD * PGDIR_SIZE);
	while ((addr < last_addr) && (addr < end_addr)) {
		struct page *page;
		pud_t *level3p;

		page = kimage_alloc_control_pages(image, 0);
		if (!page) {
			result = -ENOMEM;
			goto out;
		}
		level3p = (pud_t *)page_address(page);
		result = init_level3_page(image, level3p, addr, last_addr);
		if (result)
			goto out;
		set_pgd(level4p++, __pgd(__pa(level3p) | _KERNPG_TABLE));
		addr += PGDIR_SIZE;
	}
	/* clear the unused entries */
	while (addr < end_addr) {
		pgd_clear(level4p++);
		addr += PGDIR_SIZE;
	}
out:
	return result;
}

static void free_transition_pgtable(struct kimage *image)
{
	free_page((unsigned long)image->arch.pud);
	free_page((unsigned long)image->arch.pmd);
	free_page((unsigned long)image->arch.pte);
}

static int init_transition_pgtable(struct kimage *image, pgd_t *pgd)
{
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;
	unsigned long vaddr, paddr;
	int result = -ENOMEM;

	vaddr = (unsigned long)relocate_kernel;
	paddr = __pa(page_address(image->control_code_page)+PAGE_SIZE);
	pgd += pgd_index(vaddr);
	if (!pgd_present(*pgd)) {
		pud = (pud_t *)get_zeroed_page(GFP_KERNEL);
		if (!pud)
			goto err;
		image->arch.pud = pud;
		set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE));
	}
	pud = pud_offset(pgd, vaddr);
	if (!pud_present(*pud)) {
		pmd = (pmd_t *)get_zeroed_page(GFP_KERNEL);
		if (!pmd)
			goto err;
		image->arch.pmd = pmd;
		set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
	}
	pmd = pmd_offset(pud, vaddr);
	if (!pmd_present(*pmd)) {
		pte = (pte_t *)get_zeroed_page(GFP_KERNEL);
		if (!pte)
			goto err;
		image->arch.pte = pte;
		set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE));
	}
	pte = pte_offset_kernel(pmd, vaddr);
	set_pte(pte, pfn_pte(paddr >> PAGE_SHIFT, PAGE_KERNEL_EXEC));
	return 0;
err:
	free_transition_pgtable(image);
	return result;
}


static int init_pgtable(struct kimage *image, unsigned long start_pgtable)
{
	pgd_t *level4p;
	int result;
	level4p = (pgd_t *)__va(start_pgtable);
	result = init_level4_page(image, level4p, 0, max_pfn << PAGE_SHIFT);
	if (result)
		return result;
	/*
	 * image->start may be outside 0 ~ max_pfn, for example when
	 * jump back to original kernel from kexeced kernel
	 */
	result = init_one_level2_page(image, level4p, image->start);
	if (result)
		return result;
	return init_transition_pgtable(image, level4p);
}

static void set_idt(void *newidt, u16 limit)
{
	struct desc_ptr curidt;

	/* x86-64 supports unaliged loads & stores */
	curidt.size    = limit;
	curidt.address = (unsigned long)newidt;

	__asm__ __volatile__ (
		"lidtq %0\n"
		: : "m" (curidt)
		);
};


static void set_gdt(void *newgdt, u16 limit)
{
	struct desc_ptr curgdt;

	/* x86-64 supports unaligned loads & stores */
	curgdt.size    = limit;
	curgdt.address = (unsigned long)newgdt;

	__asm__ __volatile__ (
		"lgdtq %0\n"
		: : "m" (curgdt)
		);
};

static void load_segments(void)
{
	__asm__ __volatile__ (
		"\tmovl %0,%%ds\n"
		"\tmovl %0,%%es\n"
		"\tmovl %0,%%ss\n"
		"\tmovl %0,%%fs\n"
		"\tmovl %0,%%gs\n"
		: : "a" (__KERNEL_DS) : "memory"
		);
}

int machine_kexec_prepare(struct kimage *image)
{
	unsigned long start_pgtable;
	int result;

	/* Calculate the offsets */
	start_pgtable = page_to_pfn(image->control_code_page) << PAGE_SHIFT;

	/* Setup the identity mapped 64bit page table */
	result = init_pgtable(image, start_pgtable);
	if (result)
		return result;

	return 0;
}

void machine_kexec_cleanup(struct kimage *image)
{
	free_transition_pgtable(image);
}

/*
 * Do not allocate memory (or fail in any way) in machine_kexec().
 * We are past the point of no return, committed to rebooting now.
 */
void machine_kexec(struct kimage *image)
{
	unsigned long page_list[PAGES_NR];
	void *control_page;
	int save_ftrace_enabled;

#ifdef CONFIG_KEXEC_JUMP
	if (kexec_image->preserve_context)
		save_processor_state();
#endif

	save_ftrace_enabled = __ftrace_enabled_save();

	/* Interrupts aren't acceptable while we reboot */
	local_irq_disable();

	if (image->preserve_context) {
#ifdef CONFIG_X86_IO_APIC
		/*
		 * We need to put APICs in legacy mode so that we can
		 * get timer interrupts in second kernel. kexec/kdump
		 * paths already have calls to disable_IO_APIC() in
		 * one form or other. kexec jump path also need
		 * one.
		 */
		disable_IO_APIC();
#endif
	}

	control_page = page_address(image->control_code_page) + PAGE_SIZE;
	memcpy(control_page, relocate_kernel, KEXEC_CONTROL_CODE_MAX_SIZE);

	page_list[PA_CONTROL_PAGE] = virt_to_phys(control_page);
	page_list[VA_CONTROL_PAGE] = (unsigned long)control_page;
	page_list[PA_TABLE_PAGE] =
	  (unsigned long)__pa(page_address(image->control_code_page));

	if (image->type == KEXEC_TYPE_DEFAULT)
		page_list[PA_SWAP_PAGE] = (page_to_pfn(image->swap_page)
						<< PAGE_SHIFT);

	/*
	 * The segment registers are funny things, they have both a
	 * visible and an invisible part.  Whenever the visible part is
	 * set to a specific selector, the invisible part is loaded
	 * with from a table in memory.  At no other time is the
	 * descriptor table in memory accessed.
	 *
	 * I take advantage of this here by force loading the
	 * segments, before I zap the gdt with an invalid value.
	 */
	load_segments();
	/*
	 * The gdt & idt are now invalid.
	 * If you want to load them you must set up your own idt & gdt.
	 */
	set_gdt(phys_to_virt(0), 0);
	set_idt(phys_to_virt(0), 0);

	/* now call it */
	image->start = relocate_kernel((unsigned long)image->head,
				       (unsigned long)page_list,
				       image->start,
				       image->preserve_context);

#ifdef CONFIG_KEXEC_JUMP
	if (kexec_image->preserve_context)
		restore_processor_state();
#endif

	__ftrace_enabled_restore(save_ftrace_enabled);
}

void arch_crash_save_vmcoreinfo(void)
{
	VMCOREINFO_SYMBOL(phys_base);
	VMCOREINFO_SYMBOL(init_level4_pgt);

#ifdef CONFIG_NUMA
	VMCOREINFO_SYMBOL(node_data);
	VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
#endif
}
Commit	Line	Data
5234f5eb	1	/*
835c34a1	2	* handle transition of Linux booting another kernel
5234f5eb EB	3	* Copyright (C) 2002-2005 Eric Biederman <ebiederm@xmission.com>
	4	*
	5	* This source code is licensed under the GNU General Public License,
	6	* Version 2. See the file COPYING for more details.
	7	*/
	8
	9	#include <linux/mm.h>
	10	#include <linux/kexec.h>
5234f5eb EB	11	#include <linux/string.h>
5234f5eb EB	12	#include <linux/reboot.h>
fd59d231	13	#include <linux/numa.h>
f43fdad8	14	#include <linux/ftrace.h>
fef3a7a1	15	#include <linux/io.h>
fee7b0d8	16	#include <linux/suspend.h>
f43fdad8	17
5234f5eb	18	#include <asm/pgtable.h>
5234f5eb EB	19	#include <asm/tlbflush.h>
5234f5eb EB	20	#include <asm/mmu_context.h>
8bf27556	21
53594547 HY	22	static int init_one_level2_page(struct kimage image, pgd_t pgd,
	23	unsigned long addr)
	24	{
	25	pud_t *pud;
	26	pmd_t *pmd;
	27	struct page *page;
	28	int result = -ENOMEM;
	29
	30	addr &= PMD_MASK;
	31	pgd += pgd_index(addr);
	32	if (!pgd_present(*pgd)) {
	33	page = kimage_alloc_control_pages(image, 0);
	34	if (!page)
	35	goto out;
	36	pud = (pud_t *)page_address(page);
	37	memset(pud, 0, PAGE_SIZE);
	38	set_pgd(pgd, __pgd(__pa(pud) \| _KERNPG_TABLE));
	39	}
	40	pud = pud_offset(pgd, addr);
	41	if (!pud_present(*pud)) {
	42	page = kimage_alloc_control_pages(image, 0);
	43	if (!page)
	44	goto out;
	45	pmd = (pmd_t *)page_address(page);
	46	memset(pmd, 0, PAGE_SIZE);
	47	set_pud(pud, __pud(__pa(pmd) \| _KERNPG_TABLE));
	48	}
	49	pmd = pmd_offset(pud, addr);
	50	if (!pmd_present(*pmd))
	51	set_pmd(pmd, __pmd(addr \| __PAGE_KERNEL_LARGE_EXEC));
	52	result = 0;
	53	out:
	54	return result;
	55	}
	56
8bf27556	57	static void init_level2_page(pmd_t *level2p, unsigned long addr)
5234f5eb EB	58	{
5234f5eb EB	59	unsigned long end_addr;
72414d3f	60
5234f5eb	61	addr &= PAGE_MASK;
8bf27556	62	end_addr = addr + PUD_SIZE;
72414d3f	63	while (addr < end_addr) {
8bf27556 EB	64	set_pmd(level2p++, __pmd(addr \| __PAGE_KERNEL_LARGE_EXEC));
8bf27556 EB	65	addr += PMD_SIZE;
5234f5eb EB	66	}
	67	}
	68
8bf27556	69	static int init_level3_page(struct kimage image, pud_t level3p,
72414d3f	70	unsigned long addr, unsigned long last_addr)
5234f5eb EB	71	{
	72	unsigned long end_addr;
	73	int result;
72414d3f	74
5234f5eb EB	75	result = 0;
5234f5eb EB	76	addr &= PAGE_MASK;
8bf27556	77	end_addr = addr + PGDIR_SIZE;
72414d3f	78	while ((addr < last_addr) && (addr < end_addr)) {
5234f5eb	79	struct page *page;
8bf27556	80	pmd_t *level2p;
72414d3f	81
5234f5eb EB	82	page = kimage_alloc_control_pages(image, 0);
	83	if (!page) {
	84	result = -ENOMEM;
	85	goto out;
	86	}
8bf27556	87	level2p = (pmd_t *)page_address(page);
5234f5eb	88	init_level2_page(level2p, addr);
8bf27556 EB	89	set_pud(level3p++, __pud(__pa(level2p) \| _KERNPG_TABLE));
8bf27556 EB	90	addr += PUD_SIZE;
5234f5eb EB	91	}
5234f5eb EB	92	/* clear the unused entries */
72414d3f	93	while (addr < end_addr) {
8bf27556 EB	94	pud_clear(level3p++);
8bf27556 EB	95	addr += PUD_SIZE;
5234f5eb EB	96	}
	97	out:
	98	return result;
	99	}
	100
	101
8bf27556	102	static int init_level4_page(struct kimage image, pgd_t level4p,
72414d3f	103	unsigned long addr, unsigned long last_addr)
5234f5eb EB	104	{
	105	unsigned long end_addr;
	106	int result;
72414d3f	107
5234f5eb EB	108	result = 0;
5234f5eb EB	109	addr &= PAGE_MASK;
8bf27556	110	end_addr = addr + (PTRS_PER_PGD * PGDIR_SIZE);
72414d3f	111	while ((addr < last_addr) && (addr < end_addr)) {
5234f5eb	112	struct page *page;
8bf27556	113	pud_t *level3p;
72414d3f	114
5234f5eb EB	115	page = kimage_alloc_control_pages(image, 0);
	116	if (!page) {
	117	result = -ENOMEM;
	118	goto out;
	119	}
8bf27556	120	level3p = (pud_t *)page_address(page);
5234f5eb	121	result = init_level3_page(image, level3p, addr, last_addr);
fef3a7a1	122	if (result)
5234f5eb	123	goto out;
8bf27556 EB	124	set_pgd(level4p++, __pgd(__pa(level3p) \| _KERNPG_TABLE));
8bf27556 EB	125	addr += PGDIR_SIZE;
5234f5eb EB	126	}
5234f5eb EB	127	/* clear the unused entries */
72414d3f	128	while (addr < end_addr) {
8bf27556 EB	129	pgd_clear(level4p++);
8bf27556 EB	130	addr += PGDIR_SIZE;
5234f5eb	131	}
72414d3f	132	out:
5234f5eb EB	133	return result;
	134	}
	135
f5deb796 HY	136	static void free_transition_pgtable(struct kimage *image)
	137	{
	138	free_page((unsigned long)image->arch.pud);
	139	free_page((unsigned long)image->arch.pmd);
	140	free_page((unsigned long)image->arch.pte);
	141	}
	142
	143	static int init_transition_pgtable(struct kimage image, pgd_t pgd)
	144	{
	145	pud_t *pud;
	146	pmd_t *pmd;
	147	pte_t *pte;
	148	unsigned long vaddr, paddr;
	149	int result = -ENOMEM;
	150
	151	vaddr = (unsigned long)relocate_kernel;
	152	paddr = __pa(page_address(image->control_code_page)+PAGE_SIZE);
	153	pgd += pgd_index(vaddr);
	154	if (!pgd_present(*pgd)) {
	155	pud = (pud_t *)get_zeroed_page(GFP_KERNEL);
	156	if (!pud)
	157	goto err;
	158	image->arch.pud = pud;
	159	set_pgd(pgd, __pgd(__pa(pud) \| _KERNPG_TABLE));
	160	}
	161	pud = pud_offset(pgd, vaddr);
	162	if (!pud_present(*pud)) {
	163	pmd = (pmd_t *)get_zeroed_page(GFP_KERNEL);
	164	if (!pmd)
	165	goto err;
	166	image->arch.pmd = pmd;
	167	set_pud(pud, __pud(__pa(pmd) \| _KERNPG_TABLE));
	168	}
	169	pmd = pmd_offset(pud, vaddr);
	170	if (!pmd_present(*pmd)) {
	171	pte = (pte_t *)get_zeroed_page(GFP_KERNEL);
	172	if (!pte)
	173	goto err;
	174	image->arch.pte = pte;
	175	set_pmd(pmd, __pmd(__pa(pte) \| _KERNPG_TABLE));
	176	}
	177	pte = pte_offset_kernel(pmd, vaddr);
	178	set_pte(pte, pfn_pte(paddr >> PAGE_SHIFT, PAGE_KERNEL_EXEC));
	179	return 0;
	180	err:
	181	free_transition_pgtable(image);
	182	return result;
	183	}
	184
5234f5eb EB	185
	186	static int init_pgtable(struct kimage *image, unsigned long start_pgtable)
	187	{
8bf27556	188	pgd_t *level4p;
f5deb796	189	int result;
8bf27556	190	level4p = (pgd_t *)__va(start_pgtable);
f5deb796	191	result = init_level4_page(image, level4p, 0, max_pfn << PAGE_SHIFT);
53594547 HY	192	if (result)
	193	return result;
	194	/*
	195	* image->start may be outside 0 ~ max_pfn, for example when
	196	* jump back to original kernel from kexeced kernel
	197	*/
	198	result = init_one_level2_page(image, level4p, image->start);
f5deb796 HY	199	if (result)
	200	return result;
	201	return init_transition_pgtable(image, level4p);
5234f5eb EB	202	}
	203
	204	static void set_idt(void *newidt, u16 limit)
	205	{
36c4fd23	206	struct desc_ptr curidt;
5234f5eb EB	207
5234f5eb EB	208	/* x86-64 supports unaliged loads & stores */
36c4fd23 EB	209	curidt.size = limit;
36c4fd23 EB	210	curidt.address = (unsigned long)newidt;
5234f5eb EB	211
5234f5eb EB	212	__asm__ __volatile__ (
36c4fd23 EB	213	"lidtq %0\n"
36c4fd23 EB	214	: : "m" (curidt)
5234f5eb EB	215	);
	216	};
	217
	218
	219	static void set_gdt(void *newgdt, u16 limit)
	220	{
36c4fd23	221	struct desc_ptr curgdt;
5234f5eb EB	222
5234f5eb EB	223	/* x86-64 supports unaligned loads & stores */
36c4fd23 EB	224	curgdt.size = limit;
36c4fd23 EB	225	curgdt.address = (unsigned long)newgdt;
5234f5eb EB	226
5234f5eb EB	227	__asm__ __volatile__ (
36c4fd23 EB	228	"lgdtq %0\n"
36c4fd23 EB	229	: : "m" (curgdt)
5234f5eb EB	230	);
	231	};
	232
	233	static void load_segments(void)
	234	{
	235	__asm__ __volatile__ (
36c4fd23 EB	236	"\tmovl %0,%%ds\n"
	237	"\tmovl %0,%%es\n"
	238	"\tmovl %0,%%ss\n"
	239	"\tmovl %0,%%fs\n"
	240	"\tmovl %0,%%gs\n"
2ec5e3a8	241	: : "a" (__KERNEL_DS) : "memory"
5234f5eb	242	);
5234f5eb EB	243	}
5234f5eb EB	244
5234f5eb EB	245	int machine_kexec_prepare(struct kimage *image)
5234f5eb EB	246	{
4bfaaef0	247	unsigned long start_pgtable;
5234f5eb EB	248	int result;
	249
	250	/* Calculate the offsets */
72414d3f	251	start_pgtable = page_to_pfn(image->control_code_page) << PAGE_SHIFT;
5234f5eb EB	252
	253	/* Setup the identity mapped 64bit page table */
	254	result = init_pgtable(image, start_pgtable);
72414d3f	255	if (result)
5234f5eb	256	return result;
5234f5eb	257
5234f5eb EB	258	return 0;
	259	}
	260
	261	void machine_kexec_cleanup(struct kimage *image)
	262	{
f5deb796	263	free_transition_pgtable(image);
5234f5eb EB	264	}
	265
	266	/*
	267	* Do not allocate memory (or fail in any way) in machine_kexec().
	268	* We are past the point of no return, committed to rebooting now.
	269	*/
3ab83521	270	void machine_kexec(struct kimage *image)
5234f5eb	271	{
4bfaaef0 MD	272	unsigned long page_list[PAGES_NR];
4bfaaef0 MD	273	void *control_page;
fee7b0d8	274	int save_ftrace_enabled;
5234f5eb	275
fee7b0d8 HY	276	#ifdef CONFIG_KEXEC_JUMP
	277	if (kexec_image->preserve_context)
	278	save_processor_state();
	279	#endif
	280
	281	save_ftrace_enabled = __ftrace_enabled_save();
f43fdad8	282
5234f5eb EB	283	/* Interrupts aren't acceptable while we reboot */
	284	local_irq_disable();
	285
fee7b0d8 HY	286	if (image->preserve_context) {
	287	#ifdef CONFIG_X86_IO_APIC
	288	/*
	289	* We need to put APICs in legacy mode so that we can
	290	* get timer interrupts in second kernel. kexec/kdump
	291	* paths already have calls to disable_IO_APIC() in
	292	* one form or other. kexec jump path also need
	293	* one.
	294	*/
	295	disable_IO_APIC();
	296	#endif
	297	}
	298
4bfaaef0	299	control_page = page_address(image->control_code_page) + PAGE_SIZE;
fee7b0d8	300	memcpy(control_page, relocate_kernel, KEXEC_CONTROL_CODE_MAX_SIZE);
4bfaaef0	301
e3ebadd9	302	page_list[PA_CONTROL_PAGE] = virt_to_phys(control_page);
fee7b0d8	303	page_list[VA_CONTROL_PAGE] = (unsigned long)control_page;
4bfaaef0 MD	304	page_list[PA_TABLE_PAGE] =
4bfaaef0 MD	305	(unsigned long)__pa(page_address(image->control_code_page));
5234f5eb	306
fee7b0d8 HY	307	if (image->type == KEXEC_TYPE_DEFAULT)
	308	page_list[PA_SWAP_PAGE] = (page_to_pfn(image->swap_page)
	309	<< PAGE_SHIFT);
	310
fef3a7a1 HY	311	/*
fef3a7a1 HY	312	* The segment registers are funny things, they have both a
2a8a3d5b EB	313	* visible and an invisible part. Whenever the visible part is
	314	* set to a specific selector, the invisible part is loaded
	315	* with from a table in memory. At no other time is the
	316	* descriptor table in memory accessed.
5234f5eb EB	317	*
	318	* I take advantage of this here by force loading the
	319	* segments, before I zap the gdt with an invalid value.
	320	*/
	321	load_segments();
fef3a7a1 HY	322	/*
fef3a7a1 HY	323	* The gdt & idt are now invalid.
5234f5eb EB	324	* If you want to load them you must set up your own idt & gdt.
5234f5eb EB	325	*/
fef3a7a1 HY	326	set_gdt(phys_to_virt(0), 0);
fef3a7a1 HY	327	set_idt(phys_to_virt(0), 0);
4bfaaef0	328
5234f5eb	329	/* now call it */
fee7b0d8 HY	330	image->start = relocate_kernel((unsigned long)image->head,
	331	(unsigned long)page_list,
	332	image->start,
	333	image->preserve_context);
	334
	335	#ifdef CONFIG_KEXEC_JUMP
	336	if (kexec_image->preserve_context)
	337	restore_processor_state();
	338	#endif
	339
	340	__ftrace_enabled_restore(save_ftrace_enabled);
5234f5eb	341	}
2c8c0e6b	342
fd59d231 KO	343	void arch_crash_save_vmcoreinfo(void)
fd59d231 KO	344	{
629c8b4c	345	VMCOREINFO_SYMBOL(phys_base);
69243f91	346	VMCOREINFO_SYMBOL(init_level4_pgt);
92df5c3e KO	347
	348	#ifdef CONFIG_NUMA
	349	VMCOREINFO_SYMBOL(node_data);
	350	VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
	351	#endif
fd59d231 KO	352	}
fd59d231 KO	353