https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: b01543dfe67bb1d191998e90d20534dc354de059 authored by Linus Torvalds on 18 February 2012, 23:53:33 UTC
Linux 3.3-rc4
Linux 3.3-rc4
Tip revision: b01543d
copypage-v3.c
/*
* linux/arch/arm/mm/copypage-v3.c
*
* Copyright (C) 1995-1999 Russell King
*
* 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.
*/
#include <linux/init.h>
#include <linux/highmem.h>
/*
* ARMv3 optimised copy_user_highpage
*
* FIXME: do we need to handle cache stuff...
*/
static void __naked
v3_copy_user_page(void *kto, const void *kfrom)
{
asm("\n\
stmfd sp!, {r4, lr} @ 2\n\
mov r2, %2 @ 1\n\
ldmia %0!, {r3, r4, ip, lr} @ 4+1\n\
1: stmia %1!, {r3, r4, ip, lr} @ 4\n\
ldmia %0!, {r3, r4, ip, lr} @ 4+1\n\
stmia %1!, {r3, r4, ip, lr} @ 4\n\
ldmia %0!, {r3, r4, ip, lr} @ 4+1\n\
stmia %1!, {r3, r4, ip, lr} @ 4\n\
ldmia %0!, {r3, r4, ip, lr} @ 4\n\
subs r2, r2, #1 @ 1\n\
stmia %1!, {r3, r4, ip, lr} @ 4\n\
ldmneia %0!, {r3, r4, ip, lr} @ 4\n\
bne 1b @ 1\n\
ldmfd sp!, {r4, pc} @ 3"
:
: "r" (kfrom), "r" (kto), "I" (PAGE_SIZE / 64));
}
void v3_copy_user_highpage(struct page *to, struct page *from,
unsigned long vaddr, struct vm_area_struct *vma)
{
void *kto, *kfrom;
kto = kmap_atomic(to, KM_USER0);
kfrom = kmap_atomic(from, KM_USER1);
v3_copy_user_page(kto, kfrom);
kunmap_atomic(kfrom, KM_USER1);
kunmap_atomic(kto, KM_USER0);
}
/*
* ARMv3 optimised clear_user_page
*
* FIXME: do we need to handle cache stuff...
*/
void v3_clear_user_highpage(struct page *page, unsigned long vaddr)
{
void *ptr, *kaddr = kmap_atomic(page, KM_USER0);
asm volatile("\n\
mov r1, %2 @ 1\n\
mov r2, #0 @ 1\n\
mov r3, #0 @ 1\n\
mov ip, #0 @ 1\n\
mov lr, #0 @ 1\n\
1: stmia %0!, {r2, r3, ip, lr} @ 4\n\
stmia %0!, {r2, r3, ip, lr} @ 4\n\
stmia %0!, {r2, r3, ip, lr} @ 4\n\
stmia %0!, {r2, r3, ip, lr} @ 4\n\
subs r1, r1, #1 @ 1\n\
bne 1b @ 1"
: "=r" (ptr)
: "0" (kaddr), "I" (PAGE_SIZE / 64)
: "r1", "r2", "r3", "ip", "lr");
kunmap_atomic(kaddr, KM_USER0);
}
struct cpu_user_fns v3_user_fns __initdata = {
.cpu_clear_user_highpage = v3_clear_user_highpage,
.cpu_copy_user_highpage = v3_copy_user_highpage,
};