[linux-2.6-block.git] / arch / arm64 / kernel / vdso.c

/*
 * VDSO implementations.
 *
 * Copyright (C) 2012 ARM Limited
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Author: Will Deacon <will.deacon@arm.com>
 */

#include <linux/cache.h>
#include <linux/clocksource.h>
#include <linux/elf.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/slab.h>
#include <linux/timekeeper_internal.h>
#include <linux/vmalloc.h>

#include <asm/cacheflush.h>
#include <asm/signal32.h>
#include <asm/vdso.h>
#include <asm/vdso_datapage.h>

extern char vdso_start[], vdso_end[];
static unsigned long vdso_pages __ro_after_init;

/*
 * The vDSO data page.
 */
static union {
	struct vdso_data	data;
	u8			page[PAGE_SIZE];
} vdso_data_store __page_aligned_data;
struct vdso_data *vdso_data = &vdso_data_store.data;

#ifdef CONFIG_COMPAT
/*
 * Create and map the vectors page for AArch32 tasks.
 */
#define C_VECTORS	0
#define C_SIGPAGE	1
#define C_PAGES		(C_SIGPAGE + 1)
static struct page *aarch32_vdso_pages[C_PAGES] __ro_after_init;
static const struct vm_special_mapping aarch32_vdso_spec[C_PAGES] = {
	{
		.name	= "[vectors]", /* ABI */
		.pages	= &aarch32_vdso_pages[C_VECTORS],
	},
	{
		.name	= "[sigpage]", /* ABI */
		.pages	= &aarch32_vdso_pages[C_SIGPAGE],
	},
};

static int aarch32_alloc_kuser_vdso_page(void)
{
	extern char __kuser_helper_start[], __kuser_helper_end[];
	int kuser_sz = __kuser_helper_end - __kuser_helper_start;
	unsigned long vdso_page;

	if (!IS_ENABLED(CONFIG_KUSER_HELPERS))
		return 0;

	vdso_page = get_zeroed_page(GFP_ATOMIC);
	if (!vdso_page)
		return -ENOMEM;

	memcpy((void *)(vdso_page + 0x1000 - kuser_sz), __kuser_helper_start,
	       kuser_sz);
	aarch32_vdso_pages[C_VECTORS] = virt_to_page(vdso_page);
	flush_dcache_page(aarch32_vdso_pages[C_VECTORS]);
	return 0;
}

static int __init aarch32_alloc_vdso_pages(void)
{
	extern char __aarch32_sigret_code_start[], __aarch32_sigret_code_end[];
	int sigret_sz = __aarch32_sigret_code_end - __aarch32_sigret_code_start;
	unsigned long sigpage;
	int ret;

	sigpage = get_zeroed_page(GFP_ATOMIC);
	if (!sigpage)
		return -ENOMEM;

	memcpy((void *)sigpage, __aarch32_sigret_code_start, sigret_sz);
	aarch32_vdso_pages[C_SIGPAGE] = virt_to_page(sigpage);
	flush_dcache_page(aarch32_vdso_pages[C_SIGPAGE]);

	ret = aarch32_alloc_kuser_vdso_page();
	if (ret)
		free_page(sigpage);

	return ret;
}
arch_initcall(aarch32_alloc_vdso_pages);

static int aarch32_kuser_helpers_setup(struct mm_struct *mm)
{
	void *ret;

	if (!IS_ENABLED(CONFIG_KUSER_HELPERS))
		return 0;

	/*
	 * Avoid VM_MAYWRITE for compatibility with arch/arm/, where it's
	 * not safe to CoW the page containing the CPU exception vectors.
	 */
	ret = _install_special_mapping(mm, AARCH32_VECTORS_BASE, PAGE_SIZE,
				       VM_READ | VM_EXEC |
				       VM_MAYREAD | VM_MAYEXEC,
				       &aarch32_vdso_spec[C_VECTORS]);

	return PTR_ERR_OR_ZERO(ret);
}

static int aarch32_sigreturn_setup(struct mm_struct *mm)
{
	unsigned long addr;
	void *ret;

	addr = get_unmapped_area(NULL, 0, PAGE_SIZE, 0, 0);
	if (IS_ERR_VALUE(addr)) {
		ret = ERR_PTR(addr);
		goto out;
	}

	/*
	 * VM_MAYWRITE is required to allow gdb to Copy-on-Write and
	 * set breakpoints.
	 */
	ret = _install_special_mapping(mm, addr, PAGE_SIZE,
				       VM_READ | VM_EXEC | VM_MAYREAD |
				       VM_MAYWRITE | VM_MAYEXEC,
				       &aarch32_vdso_spec[C_SIGPAGE]);
	if (IS_ERR(ret))
		goto out;

	mm->context.vdso = (void *)addr;

out:
	return PTR_ERR_OR_ZERO(ret);
}

int aarch32_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
{
	struct mm_struct *mm = current->mm;
	int ret;

	if (down_write_killable(&mm->mmap_sem))
		return -EINTR;

	ret = aarch32_kuser_helpers_setup(mm);
	if (ret)
		goto out;

	ret = aarch32_sigreturn_setup(mm);

out:
	up_write(&mm->mmap_sem);
	return ret;
}
#endif /* CONFIG_COMPAT */

static int vdso_mremap(const struct vm_special_mapping *sm,
		struct vm_area_struct *new_vma)
{
	unsigned long new_size = new_vma->vm_end - new_vma->vm_start;
	unsigned long vdso_size = vdso_end - vdso_start;

	if (vdso_size != new_size)
		return -EINVAL;

	current->mm->context.vdso = (void *)new_vma->vm_start;

	return 0;
}

static struct vm_special_mapping vdso_spec[2] __ro_after_init = {
	{
		.name	= "[vvar]",
	},
	{
		.name	= "[vdso]",
		.mremap = vdso_mremap,
	},
};

static int __init vdso_init(void)
{
	int i;
	struct page **vdso_pagelist;
	unsigned long pfn;

	if (memcmp(vdso_start, "\177ELF", 4)) {
		pr_err("vDSO is not a valid ELF object!\n");
		return -EINVAL;
	}

	vdso_pages = (vdso_end - vdso_start) >> PAGE_SHIFT;

	/* Allocate the vDSO pagelist, plus a page for the data. */
	vdso_pagelist = kcalloc(vdso_pages + 1, sizeof(struct page *),
				GFP_KERNEL);
	if (vdso_pagelist == NULL)
		return -ENOMEM;

	/* Grab the vDSO data page. */
	vdso_pagelist[0] = phys_to_page(__pa_symbol(vdso_data));


	/* Grab the vDSO code pages. */
	pfn = sym_to_pfn(vdso_start);

	for (i = 0; i < vdso_pages; i++)
		vdso_pagelist[i + 1] = pfn_to_page(pfn + i);

	vdso_spec[0].pages = &vdso_pagelist[0];
	vdso_spec[1].pages = &vdso_pagelist[1];

	return 0;
}
arch_initcall(vdso_init);

int arch_setup_additional_pages(struct linux_binprm *bprm,
				int uses_interp)
{
	struct mm_struct *mm = current->mm;
	unsigned long vdso_base, vdso_text_len, vdso_mapping_len;
	void *ret;

	vdso_text_len = vdso_pages << PAGE_SHIFT;
	/* Be sure to map the data page */
	vdso_mapping_len = vdso_text_len + PAGE_SIZE;

	if (down_write_killable(&mm->mmap_sem))
		return -EINTR;
	vdso_base = get_unmapped_area(NULL, 0, vdso_mapping_len, 0, 0);
	if (IS_ERR_VALUE(vdso_base)) {
		ret = ERR_PTR(vdso_base);
		goto up_fail;
	}
	ret = _install_special_mapping(mm, vdso_base, PAGE_SIZE,
				       VM_READ|VM_MAYREAD,
				       &vdso_spec[0]);
	if (IS_ERR(ret))
		goto up_fail;

	vdso_base += PAGE_SIZE;
	mm->context.vdso = (void *)vdso_base;
	ret = _install_special_mapping(mm, vdso_base, vdso_text_len,
				       VM_READ|VM_EXEC|
				       VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
				       &vdso_spec[1]);
	if (IS_ERR(ret))
		goto up_fail;


	up_write(&mm->mmap_sem);
	return 0;

up_fail:
	mm->context.vdso = NULL;
	up_write(&mm->mmap_sem);
	return PTR_ERR(ret);
}

/*
 * Update the vDSO data page to keep in sync with kernel timekeeping.
 */
void update_vsyscall(struct timekeeper *tk)
{
	u32 use_syscall = !tk->tkr_mono.clock->archdata.vdso_direct;

	++vdso_data->tb_seq_count;
	smp_wmb();

	vdso_data->use_syscall			= use_syscall;
	vdso_data->xtime_coarse_sec		= tk->xtime_sec;
	vdso_data->xtime_coarse_nsec		= tk->tkr_mono.xtime_nsec >>
							tk->tkr_mono.shift;
	vdso_data->wtm_clock_sec		= tk->wall_to_monotonic.tv_sec;
	vdso_data->wtm_clock_nsec		= tk->wall_to_monotonic.tv_nsec;

	/* Read without the seqlock held by clock_getres() */
	WRITE_ONCE(vdso_data->hrtimer_res, hrtimer_resolution);

	if (!use_syscall) {
		/* tkr_mono.cycle_last == tkr_raw.cycle_last */
		vdso_data->cs_cycle_last	= tk->tkr_mono.cycle_last;
		vdso_data->raw_time_sec         = tk->raw_sec;
		vdso_data->raw_time_nsec        = tk->tkr_raw.xtime_nsec;
		vdso_data->xtime_clock_sec	= tk->xtime_sec;
		vdso_data->xtime_clock_nsec	= tk->tkr_mono.xtime_nsec;
		vdso_data->cs_mono_mult		= tk->tkr_mono.mult;
		vdso_data->cs_raw_mult		= tk->tkr_raw.mult;
		/* tkr_mono.shift == tkr_raw.shift */
		vdso_data->cs_shift		= tk->tkr_mono.shift;
	}

	smp_wmb();
	++vdso_data->tb_seq_count;
}

void update_vsyscall_tz(void)
{
	vdso_data->tz_minuteswest	= sys_tz.tz_minuteswest;
	vdso_data->tz_dsttime		= sys_tz.tz_dsttime;
}
Commit	Line	Data
9031fefd	1	/*
0d747f65	2	* VDSO implementations.
9031fefd WD	3	*
	4	* Copyright (C) 2012 ARM Limited
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	17	*
	18	* Author: Will Deacon <will.deacon@arm.com>
	19	*/
	20
5a9e3e15	21	#include <linux/cache.h>
9031fefd WD	22	#include <linux/clocksource.h>
	23	#include <linux/elf.h>
	24	#include <linux/err.h>
	25	#include <linux/errno.h>
	26	#include <linux/gfp.h>
5a9e3e15	27	#include <linux/kernel.h>
9031fefd WD	28	#include <linux/mm.h>
	29	#include <linux/sched.h>
	30	#include <linux/signal.h>
	31	#include <linux/slab.h>
c60b0c28	32	#include <linux/timekeeper_internal.h>
9031fefd WD	33	#include <linux/vmalloc.h>
	34
	35	#include <asm/cacheflush.h>
	36	#include <asm/signal32.h>
	37	#include <asm/vdso.h>
	38	#include <asm/vdso_datapage.h>
	39
dbbb08f5	40	extern char vdso_start[], vdso_end[];
5a9e3e15	41	static unsigned long vdso_pages __ro_after_init;
9031fefd WD	42
	43	/*
	44	* The vDSO data page.
	45	*/
	46	static union {
	47	struct vdso_data data;
	48	u8 page[PAGE_SIZE];
	49	} vdso_data_store __page_aligned_data;
	50	struct vdso_data *vdso_data = &vdso_data_store.data;
	51
	52	#ifdef CONFIG_COMPAT
	53	/*
	54	* Create and map the vectors page for AArch32 tasks.
	55	*/
0d747f65 VF	56	#define C_VECTORS 0
	57	#define C_SIGPAGE 1
	58	#define C_PAGES (C_SIGPAGE + 1)
	59	static struct page *aarch32_vdso_pages[C_PAGES] __ro_after_init;
	60	static const struct vm_special_mapping aarch32_vdso_spec[C_PAGES] = {
	61	{
	62	.name = "[vectors]", /* ABI */
	63	.pages = &aarch32_vdso_pages[C_VECTORS],
	64	},
	65	{
	66	.name = "[sigpage]", /* ABI */
	67	.pages = &aarch32_vdso_pages[C_SIGPAGE],
	68	},
	69	};
9031fefd	70
1255a734	71	static int aarch32_alloc_kuser_vdso_page(void)
9031fefd WD	72	{
	73	extern char __kuser_helper_start[], __kuser_helper_end[];
	74	int kuser_sz = __kuser_helper_end - __kuser_helper_start;
1255a734	75	unsigned long vdso_page;
9031fefd	76
af1b3cf2 VF	77	if (!IS_ENABLED(CONFIG_KUSER_HELPERS))
	78	return 0;
	79
1255a734 VF	80	vdso_page = get_zeroed_page(GFP_ATOMIC);
1255a734 VF	81	if (!vdso_page)
0d747f65	82	return -ENOMEM;
9031fefd	83
1255a734	84	memcpy((void *)(vdso_page + 0x1000 - kuser_sz), __kuser_helper_start,
0d747f65	85	kuser_sz);
1255a734 VF	86	aarch32_vdso_pages[C_VECTORS] = virt_to_page(vdso_page);
	87	flush_dcache_page(aarch32_vdso_pages[C_VECTORS]);
	88	return 0;
	89	}
	90
	91	static int __init aarch32_alloc_vdso_pages(void)
	92	{
	93	extern char __aarch32_sigret_code_start[], __aarch32_sigret_code_end[];
	94	int sigret_sz = __aarch32_sigret_code_end - __aarch32_sigret_code_start;
	95	unsigned long sigpage;
	96	int ret;
9031fefd	97
1255a734 VF	98	sigpage = get_zeroed_page(GFP_ATOMIC);
	99	if (!sigpage)
	100	return -ENOMEM;
0d747f65	101
1255a734 VF	102	memcpy((void *)sigpage, __aarch32_sigret_code_start, sigret_sz);
	103	aarch32_vdso_pages[C_SIGPAGE] = virt_to_page(sigpage);
	104	flush_dcache_page(aarch32_vdso_pages[C_SIGPAGE]);
9031fefd	105
1255a734 VF	106	ret = aarch32_alloc_kuser_vdso_page();
	107	if (ret)
	108	free_page(sigpage);
9031fefd	109
1255a734	110	return ret;
9031fefd	111	}
0d747f65	112	arch_initcall(aarch32_alloc_vdso_pages);
9031fefd	113
0d747f65	114	static int aarch32_kuser_helpers_setup(struct mm_struct *mm)
9031fefd	115	{
0d747f65	116	void *ret;
2fea7f6c	117
af1b3cf2 VF	118	if (!IS_ENABLED(CONFIG_KUSER_HELPERS))
	119	return 0;
	120
0d747f65 VF	121	/*
	122	* Avoid VM_MAYWRITE for compatibility with arch/arm/, where it's
	123	* not safe to CoW the page containing the CPU exception vectors.
	124	*/
	125	ret = _install_special_mapping(mm, AARCH32_VECTORS_BASE, PAGE_SIZE,
	126	VM_READ \| VM_EXEC \|
	127	VM_MAYREAD \| VM_MAYEXEC,
	128	&aarch32_vdso_spec[C_VECTORS]);
	129
	130	return PTR_ERR_OR_ZERO(ret);
	131	}
	132
	133	static int aarch32_sigreturn_setup(struct mm_struct *mm)
	134	{
	135	unsigned long addr;
2fea7f6c	136	void *ret;
9031fefd	137
0d747f65 VF	138	addr = get_unmapped_area(NULL, 0, PAGE_SIZE, 0, 0);
	139	if (IS_ERR_VALUE(addr)) {
	140	ret = ERR_PTR(addr);
	141	goto out;
	142	}
9031fefd	143
0d747f65 VF	144	/*
	145	* VM_MAYWRITE is required to allow gdb to Copy-on-Write and
	146	* set breakpoints.
	147	*/
2fea7f6c	148	ret = _install_special_mapping(mm, addr, PAGE_SIZE,
0d747f65 VF	149	VM_READ \| VM_EXEC \| VM_MAYREAD \|
	150	VM_MAYWRITE \| VM_MAYEXEC,
	151	&aarch32_vdso_spec[C_SIGPAGE]);
	152	if (IS_ERR(ret))
	153	goto out;
9031fefd	154
0d747f65	155	mm->context.vdso = (void *)addr;
9031fefd	156
0d747f65	157	out:
2fea7f6c	158	return PTR_ERR_OR_ZERO(ret);
9031fefd	159	}
0d747f65 VF	160
	161	int aarch32_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
	162	{
	163	struct mm_struct *mm = current->mm;
	164	int ret;
	165
	166	if (down_write_killable(&mm->mmap_sem))
	167	return -EINTR;
	168
	169	ret = aarch32_kuser_helpers_setup(mm);
	170	if (ret)
	171	goto out;
	172
	173	ret = aarch32_sigreturn_setup(mm);
	174
	175	out:
	176	up_write(&mm->mmap_sem);
	177	return ret;
	178	}
9031fefd WD	179	#endif /* CONFIG_COMPAT */
9031fefd WD	180
73958695 DS	181	static int vdso_mremap(const struct vm_special_mapping *sm,
	182	struct vm_area_struct *new_vma)
	183	{
	184	unsigned long new_size = new_vma->vm_end - new_vma->vm_start;
	185	unsigned long vdso_size = vdso_end - vdso_start;
	186
	187	if (vdso_size != new_size)
	188	return -EINVAL;
	189
	190	current->mm->context.vdso = (void *)new_vma->vm_start;
	191
	192	return 0;
	193	}
	194
5a9e3e15 JZ	195	static struct vm_special_mapping vdso_spec[2] __ro_after_init = {
	196	{
	197	.name = "[vvar]",
	198	},
	199	{
	200	.name = "[vdso]",
73958695	201	.mremap = vdso_mremap,
5a9e3e15 JZ	202	},
5a9e3e15 JZ	203	};
2fea7f6c	204
9031fefd WD	205	static int __init vdso_init(void)
9031fefd WD	206	{
16fb1a9b	207	int i;
5a9e3e15	208	struct page **vdso_pagelist;
2077be67	209	unsigned long pfn;
16fb1a9b	210
dbbb08f5	211	if (memcmp(vdso_start, "\177ELF", 4)) {
16fb1a9b NL	212	pr_err("vDSO is not a valid ELF object!\n");
	213	return -EINVAL;
	214	}
9031fefd	215
dbbb08f5	216	vdso_pages = (vdso_end - vdso_start) >> PAGE_SHIFT;
9031fefd WD	217
9031fefd WD	218	/* Allocate the vDSO pagelist, plus a page for the data. */
16fb1a9b	219	vdso_pagelist = kcalloc(vdso_pages + 1, sizeof(struct page *),
9031fefd	220	GFP_KERNEL);
16fb1a9b	221	if (vdso_pagelist == NULL)
9031fefd	222	return -ENOMEM;
9031fefd	223
601255ae	224	/* Grab the vDSO data page. */
2077be67 LA	225	vdso_pagelist[0] = phys_to_page(__pa_symbol(vdso_data));
2077be67 LA	226
601255ae	227
9031fefd	228	/* Grab the vDSO code pages. */
dbbb08f5	229	pfn = sym_to_pfn(vdso_start);
2077be67	230
16fb1a9b	231	for (i = 0; i < vdso_pages; i++)
2077be67	232	vdso_pagelist[i + 1] = pfn_to_page(pfn + i);
9031fefd	233
5a9e3e15 JZ	234	vdso_spec[0].pages = &vdso_pagelist[0];
5a9e3e15 JZ	235	vdso_spec[1].pages = &vdso_pagelist[1];
2fea7f6c	236
16fb1a9b	237	return 0;
9031fefd WD	238	}
	239	arch_initcall(vdso_init);
	240
	241	int arch_setup_additional_pages(struct linux_binprm *bprm,
	242	int uses_interp)
	243	{
	244	struct mm_struct *mm = current->mm;
87154938	245	unsigned long vdso_base, vdso_text_len, vdso_mapping_len;
2fea7f6c	246	void *ret;
9031fefd	247
87154938	248	vdso_text_len = vdso_pages << PAGE_SHIFT;
9031fefd	249	/* Be sure to map the data page */
87154938	250	vdso_mapping_len = vdso_text_len + PAGE_SIZE;
9031fefd	251
69048176 MH	252	if (down_write_killable(&mm->mmap_sem))
69048176 MH	253	return -EINTR;
9031fefd WD	254	vdso_base = get_unmapped_area(NULL, 0, vdso_mapping_len, 0, 0);
9031fefd WD	255	if (IS_ERR_VALUE(vdso_base)) {
2fea7f6c	256	ret = ERR_PTR(vdso_base);
9031fefd WD	257	goto up_fail;
9031fefd WD	258	}
601255ae WD	259	ret = _install_special_mapping(mm, vdso_base, PAGE_SIZE,
601255ae WD	260	VM_READ\|VM_MAYREAD,
2fea7f6c WD	261	&vdso_spec[0]);
2fea7f6c WD	262	if (IS_ERR(ret))
87154938 WD	263	goto up_fail;
87154938 WD	264
601255ae WD	265	vdso_base += PAGE_SIZE;
	266	mm->context.vdso = (void *)vdso_base;
	267	ret = _install_special_mapping(mm, vdso_base, vdso_text_len,
	268	VM_READ\|VM_EXEC\|
	269	VM_MAYREAD\|VM_MAYWRITE\|VM_MAYEXEC,
2fea7f6c WD	270	&vdso_spec[1]);
2fea7f6c WD	271	if (IS_ERR(ret))
9031fefd	272	goto up_fail;
9031fefd	273
601255ae	274
9031fefd	275	up_write(&mm->mmap_sem);
87154938	276	return 0;
9031fefd	277
87154938 WD	278	up_fail:
	279	mm->context.vdso = NULL;
	280	up_write(&mm->mmap_sem);
2fea7f6c	281	return PTR_ERR(ret);
9031fefd WD	282	}
9031fefd WD	283
9031fefd WD	284	/*
	285	* Update the vDSO data page to keep in sync with kernel timekeeping.
	286	*/
c60b0c28	287	void update_vsyscall(struct timekeeper *tk)
9031fefd	288	{
1d8f51d4	289	u32 use_syscall = !tk->tkr_mono.clock->archdata.vdso_direct;
9031fefd WD	290
	291	++vdso_data->tb_seq_count;
	292	smp_wmb();
	293
9031fefd	294	vdso_data->use_syscall = use_syscall;
878854a3 NL	295	vdso_data->xtime_coarse_sec = tk->xtime_sec;
	296	vdso_data->xtime_coarse_nsec = tk->tkr_mono.xtime_nsec >>
	297	tk->tkr_mono.shift;
d4022a33 NL	298	vdso_data->wtm_clock_sec = tk->wall_to_monotonic.tv_sec;
d4022a33 NL	299	vdso_data->wtm_clock_nsec = tk->wall_to_monotonic.tv_nsec;
9031fefd	300
81fb8736 VF	301	/* Read without the seqlock held by clock_getres() */
	302	WRITE_ONCE(vdso_data->hrtimer_res, hrtimer_resolution);
	303
9031fefd	304	if (!use_syscall) {
49eea433	305	/* tkr_mono.cycle_last == tkr_raw.cycle_last */
876e7881	306	vdso_data->cs_cycle_last = tk->tkr_mono.cycle_last;
fc6eead7 JS	307	vdso_data->raw_time_sec = tk->raw_sec;
fc6eead7 JS	308	vdso_data->raw_time_nsec = tk->tkr_raw.xtime_nsec;
c60b0c28	309	vdso_data->xtime_clock_sec = tk->xtime_sec;
876e7881	310	vdso_data->xtime_clock_nsec = tk->tkr_mono.xtime_nsec;
49eea433 KB	311	vdso_data->cs_mono_mult = tk->tkr_mono.mult;
	312	vdso_data->cs_raw_mult = tk->tkr_raw.mult;
	313	/* tkr_mono.shift == tkr_raw.shift */
876e7881	314	vdso_data->cs_shift = tk->tkr_mono.shift;
9031fefd WD	315	}
	316
	317	smp_wmb();
	318	++vdso_data->tb_seq_count;
	319	}
	320
	321	void update_vsyscall_tz(void)
	322	{
9031fefd WD	323	vdso_data->tz_minuteswest = sys_tz.tz_minuteswest;
9031fefd WD	324	vdso_data->tz_dsttime = sys_tz.tz_dsttime;
9031fefd	325	}