[linux-block.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/gfp.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>
#include <asm/debugreg.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 (image->preserve_context)
		save_processor_state();
#endif

	save_ftrace_enabled = __ftrace_enabled_save();

	/* Interrupts aren't acceptable while we reboot */
	local_irq_disable();
	hw_breakpoint_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 (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	11	#include <linux/string.h>
5a0e3ad6	12	#include <linux/gfp.h>
5234f5eb	13	#include <linux/reboot.h>
fd59d231	14	#include <linux/numa.h>
f43fdad8	15	#include <linux/ftrace.h>
fef3a7a1	16	#include <linux/io.h>
fee7b0d8	17	#include <linux/suspend.h>
f43fdad8	18
5234f5eb	19	#include <asm/pgtable.h>
5234f5eb EB	20	#include <asm/tlbflush.h>
5234f5eb EB	21	#include <asm/mmu_context.h>
17f557e5	22	#include <asm/debugreg.h>
8bf27556	23
53594547 HY	24	static int init_one_level2_page(struct kimage image, pgd_t pgd,
	25	unsigned long addr)
	26	{
	27	pud_t *pud;
	28	pmd_t *pmd;
	29	struct page *page;
	30	int result = -ENOMEM;
	31
	32	addr &= PMD_MASK;
	33	pgd += pgd_index(addr);
	34	if (!pgd_present(*pgd)) {
	35	page = kimage_alloc_control_pages(image, 0);
	36	if (!page)
	37	goto out;
	38	pud = (pud_t *)page_address(page);
	39	memset(pud, 0, PAGE_SIZE);
	40	set_pgd(pgd, __pgd(__pa(pud) \| _KERNPG_TABLE));
	41	}
	42	pud = pud_offset(pgd, addr);
	43	if (!pud_present(*pud)) {
	44	page = kimage_alloc_control_pages(image, 0);
	45	if (!page)
	46	goto out;
	47	pmd = (pmd_t *)page_address(page);
	48	memset(pmd, 0, PAGE_SIZE);
	49	set_pud(pud, __pud(__pa(pmd) \| _KERNPG_TABLE));
	50	}
	51	pmd = pmd_offset(pud, addr);
	52	if (!pmd_present(*pmd))
	53	set_pmd(pmd, __pmd(addr \| __PAGE_KERNEL_LARGE_EXEC));
	54	result = 0;
	55	out:
	56	return result;
	57	}
	58
8bf27556	59	static void init_level2_page(pmd_t *level2p, unsigned long addr)
5234f5eb EB	60	{
5234f5eb EB	61	unsigned long end_addr;
72414d3f	62
5234f5eb	63	addr &= PAGE_MASK;
8bf27556	64	end_addr = addr + PUD_SIZE;
72414d3f	65	while (addr < end_addr) {
8bf27556 EB	66	set_pmd(level2p++, __pmd(addr \| __PAGE_KERNEL_LARGE_EXEC));
8bf27556 EB	67	addr += PMD_SIZE;
5234f5eb EB	68	}
	69	}
	70
8bf27556	71	static int init_level3_page(struct kimage image, pud_t level3p,
72414d3f	72	unsigned long addr, unsigned long last_addr)
5234f5eb EB	73	{
	74	unsigned long end_addr;
	75	int result;
72414d3f	76
5234f5eb EB	77	result = 0;
5234f5eb EB	78	addr &= PAGE_MASK;
8bf27556	79	end_addr = addr + PGDIR_SIZE;
72414d3f	80	while ((addr < last_addr) && (addr < end_addr)) {
5234f5eb	81	struct page *page;
8bf27556	82	pmd_t *level2p;
72414d3f	83
5234f5eb EB	84	page = kimage_alloc_control_pages(image, 0);
	85	if (!page) {
	86	result = -ENOMEM;
	87	goto out;
	88	}
8bf27556	89	level2p = (pmd_t *)page_address(page);
5234f5eb	90	init_level2_page(level2p, addr);
8bf27556 EB	91	set_pud(level3p++, __pud(__pa(level2p) \| _KERNPG_TABLE));
8bf27556 EB	92	addr += PUD_SIZE;
5234f5eb EB	93	}
5234f5eb EB	94	/* clear the unused entries */
72414d3f	95	while (addr < end_addr) {
8bf27556 EB	96	pud_clear(level3p++);
8bf27556 EB	97	addr += PUD_SIZE;
5234f5eb EB	98	}
	99	out:
	100	return result;
	101	}
	102
	103
8bf27556	104	static int init_level4_page(struct kimage image, pgd_t level4p,
72414d3f	105	unsigned long addr, unsigned long last_addr)
5234f5eb EB	106	{
	107	unsigned long end_addr;
	108	int result;
72414d3f	109
5234f5eb EB	110	result = 0;
5234f5eb EB	111	addr &= PAGE_MASK;
8bf27556	112	end_addr = addr + (PTRS_PER_PGD * PGDIR_SIZE);
72414d3f	113	while ((addr < last_addr) && (addr < end_addr)) {
5234f5eb	114	struct page *page;
8bf27556	115	pud_t *level3p;
72414d3f	116
5234f5eb EB	117	page = kimage_alloc_control_pages(image, 0);
	118	if (!page) {
	119	result = -ENOMEM;
	120	goto out;
	121	}
8bf27556	122	level3p = (pud_t *)page_address(page);
5234f5eb	123	result = init_level3_page(image, level3p, addr, last_addr);
fef3a7a1	124	if (result)
5234f5eb	125	goto out;
8bf27556 EB	126	set_pgd(level4p++, __pgd(__pa(level3p) \| _KERNPG_TABLE));
8bf27556 EB	127	addr += PGDIR_SIZE;
5234f5eb EB	128	}
5234f5eb EB	129	/* clear the unused entries */
72414d3f	130	while (addr < end_addr) {
8bf27556 EB	131	pgd_clear(level4p++);
8bf27556 EB	132	addr += PGDIR_SIZE;
5234f5eb	133	}
72414d3f	134	out:
5234f5eb EB	135	return result;
	136	}
	137
f5deb796 HY	138	static void free_transition_pgtable(struct kimage *image)
	139	{
	140	free_page((unsigned long)image->arch.pud);
	141	free_page((unsigned long)image->arch.pmd);
	142	free_page((unsigned long)image->arch.pte);
	143	}
	144
	145	static int init_transition_pgtable(struct kimage image, pgd_t pgd)
	146	{
	147	pud_t *pud;
	148	pmd_t *pmd;
	149	pte_t *pte;
	150	unsigned long vaddr, paddr;
	151	int result = -ENOMEM;
	152
	153	vaddr = (unsigned long)relocate_kernel;
	154	paddr = __pa(page_address(image->control_code_page)+PAGE_SIZE);
	155	pgd += pgd_index(vaddr);
	156	if (!pgd_present(*pgd)) {
	157	pud = (pud_t *)get_zeroed_page(GFP_KERNEL);
	158	if (!pud)
	159	goto err;
	160	image->arch.pud = pud;
	161	set_pgd(pgd, __pgd(__pa(pud) \| _KERNPG_TABLE));
	162	}
	163	pud = pud_offset(pgd, vaddr);
	164	if (!pud_present(*pud)) {
	165	pmd = (pmd_t *)get_zeroed_page(GFP_KERNEL);
	166	if (!pmd)
	167	goto err;
	168	image->arch.pmd = pmd;
	169	set_pud(pud, __pud(__pa(pmd) \| _KERNPG_TABLE));
	170	}
	171	pmd = pmd_offset(pud, vaddr);
	172	if (!pmd_present(*pmd)) {
	173	pte = (pte_t *)get_zeroed_page(GFP_KERNEL);
	174	if (!pte)
	175	goto err;
	176	image->arch.pte = pte;
	177	set_pmd(pmd, __pmd(__pa(pte) \| _KERNPG_TABLE));
	178	}
	179	pte = pte_offset_kernel(pmd, vaddr);
	180	set_pte(pte, pfn_pte(paddr >> PAGE_SHIFT, PAGE_KERNEL_EXEC));
	181	return 0;
	182	err:
	183	free_transition_pgtable(image);
	184	return result;
	185	}
	186
5234f5eb EB	187
	188	static int init_pgtable(struct kimage *image, unsigned long start_pgtable)
	189	{
8bf27556	190	pgd_t *level4p;
f5deb796	191	int result;
8bf27556	192	level4p = (pgd_t *)__va(start_pgtable);
f5deb796	193	result = init_level4_page(image, level4p, 0, max_pfn << PAGE_SHIFT);
53594547 HY	194	if (result)
	195	return result;
	196	/*
	197	* image->start may be outside 0 ~ max_pfn, for example when
	198	* jump back to original kernel from kexeced kernel
	199	*/
	200	result = init_one_level2_page(image, level4p, image->start);
f5deb796 HY	201	if (result)
	202	return result;
	203	return init_transition_pgtable(image, level4p);
5234f5eb EB	204	}
	205
	206	static void set_idt(void *newidt, u16 limit)
	207	{
36c4fd23	208	struct desc_ptr curidt;
5234f5eb EB	209
5234f5eb EB	210	/* x86-64 supports unaliged loads & stores */
36c4fd23 EB	211	curidt.size = limit;
36c4fd23 EB	212	curidt.address = (unsigned long)newidt;
5234f5eb EB	213
5234f5eb EB	214	__asm__ __volatile__ (
36c4fd23 EB	215	"lidtq %0\n"
36c4fd23 EB	216	: : "m" (curidt)
5234f5eb EB	217	);
	218	};
	219
	220
	221	static void set_gdt(void *newgdt, u16 limit)
	222	{
36c4fd23	223	struct desc_ptr curgdt;
5234f5eb EB	224
5234f5eb EB	225	/* x86-64 supports unaligned loads & stores */
36c4fd23 EB	226	curgdt.size = limit;
36c4fd23 EB	227	curgdt.address = (unsigned long)newgdt;
5234f5eb EB	228
5234f5eb EB	229	__asm__ __volatile__ (
36c4fd23 EB	230	"lgdtq %0\n"
36c4fd23 EB	231	: : "m" (curgdt)
5234f5eb EB	232	);
	233	};
	234
	235	static void load_segments(void)
	236	{
	237	__asm__ __volatile__ (
36c4fd23 EB	238	"\tmovl %0,%%ds\n"
	239	"\tmovl %0,%%es\n"
	240	"\tmovl %0,%%ss\n"
	241	"\tmovl %0,%%fs\n"
	242	"\tmovl %0,%%gs\n"
2ec5e3a8	243	: : "a" (__KERNEL_DS) : "memory"
5234f5eb	244	);
5234f5eb EB	245	}
5234f5eb EB	246
5234f5eb EB	247	int machine_kexec_prepare(struct kimage *image)
5234f5eb EB	248	{
4bfaaef0	249	unsigned long start_pgtable;
5234f5eb EB	250	int result;
	251
	252	/* Calculate the offsets */
72414d3f	253	start_pgtable = page_to_pfn(image->control_code_page) << PAGE_SHIFT;
5234f5eb EB	254
	255	/* Setup the identity mapped 64bit page table */
	256	result = init_pgtable(image, start_pgtable);
72414d3f	257	if (result)
5234f5eb	258	return result;
5234f5eb	259
5234f5eb EB	260	return 0;
	261	}
	262
	263	void machine_kexec_cleanup(struct kimage *image)
	264	{
f5deb796	265	free_transition_pgtable(image);
5234f5eb EB	266	}
	267
	268	/*
	269	* Do not allocate memory (or fail in any way) in machine_kexec().
	270	* We are past the point of no return, committed to rebooting now.
	271	*/
3ab83521	272	void machine_kexec(struct kimage *image)
5234f5eb	273	{
4bfaaef0 MD	274	unsigned long page_list[PAGES_NR];
4bfaaef0 MD	275	void *control_page;
fee7b0d8	276	int save_ftrace_enabled;
5234f5eb	277
fee7b0d8	278	#ifdef CONFIG_KEXEC_JUMP
6407df5c	279	if (image->preserve_context)
fee7b0d8 HY	280	save_processor_state();
	281	#endif
	282
	283	save_ftrace_enabled = __ftrace_enabled_save();
f43fdad8	284
5234f5eb EB	285	/* Interrupts aren't acceptable while we reboot */
5234f5eb EB	286	local_irq_disable();
17f557e5	287	hw_breakpoint_disable();
5234f5eb	288
fee7b0d8 HY	289	if (image->preserve_context) {
	290	#ifdef CONFIG_X86_IO_APIC
	291	/*
	292	* We need to put APICs in legacy mode so that we can
	293	* get timer interrupts in second kernel. kexec/kdump
	294	* paths already have calls to disable_IO_APIC() in
	295	* one form or other. kexec jump path also need
	296	* one.
	297	*/
	298	disable_IO_APIC();
	299	#endif
	300	}
	301
4bfaaef0	302	control_page = page_address(image->control_code_page) + PAGE_SIZE;
fee7b0d8	303	memcpy(control_page, relocate_kernel, KEXEC_CONTROL_CODE_MAX_SIZE);
4bfaaef0	304
e3ebadd9	305	page_list[PA_CONTROL_PAGE] = virt_to_phys(control_page);
fee7b0d8	306	page_list[VA_CONTROL_PAGE] = (unsigned long)control_page;
4bfaaef0 MD	307	page_list[PA_TABLE_PAGE] =
4bfaaef0 MD	308	(unsigned long)__pa(page_address(image->control_code_page));
5234f5eb	309
fee7b0d8 HY	310	if (image->type == KEXEC_TYPE_DEFAULT)
	311	page_list[PA_SWAP_PAGE] = (page_to_pfn(image->swap_page)
	312	<< PAGE_SHIFT);
	313
fef3a7a1 HY	314	/*
fef3a7a1 HY	315	* The segment registers are funny things, they have both a
2a8a3d5b EB	316	* visible and an invisible part. Whenever the visible part is
	317	* set to a specific selector, the invisible part is loaded
	318	* with from a table in memory. At no other time is the
	319	* descriptor table in memory accessed.
5234f5eb EB	320	*
	321	* I take advantage of this here by force loading the
	322	* segments, before I zap the gdt with an invalid value.
	323	*/
	324	load_segments();
fef3a7a1 HY	325	/*
fef3a7a1 HY	326	* The gdt & idt are now invalid.
5234f5eb EB	327	* If you want to load them you must set up your own idt & gdt.
5234f5eb EB	328	*/
fef3a7a1 HY	329	set_gdt(phys_to_virt(0), 0);
fef3a7a1 HY	330	set_idt(phys_to_virt(0), 0);
4bfaaef0	331
5234f5eb	332	/* now call it */
fee7b0d8 HY	333	image->start = relocate_kernel((unsigned long)image->head,
	334	(unsigned long)page_list,
	335	image->start,
	336	image->preserve_context);
	337
	338	#ifdef CONFIG_KEXEC_JUMP
6407df5c	339	if (image->preserve_context)
fee7b0d8 HY	340	restore_processor_state();
	341	#endif
	342
	343	__ftrace_enabled_restore(save_ftrace_enabled);
5234f5eb	344	}
2c8c0e6b	345
fd59d231 KO	346	void arch_crash_save_vmcoreinfo(void)
fd59d231 KO	347	{
629c8b4c	348	VMCOREINFO_SYMBOL(phys_base);
69243f91	349	VMCOREINFO_SYMBOL(init_level4_pgt);
92df5c3e KO	350
	351	#ifdef CONFIG_NUMA
	352	VMCOREINFO_SYMBOL(node_data);
	353	VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
	354	#endif
fd59d231 KO	355	}
fd59d231 KO	356