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: c9e6606c7fe92b50a02ce51dda82586ebdf99b48 authored by Linus Torvalds on 02 January 2022, 22:23:25 UTC
Linux 5.16-rc8
Linux 5.16-rc8
Tip revision: c9e6606
copypage-fa.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/arch/arm/lib/copypage-fa.S
*
* Copyright (C) 2005 Faraday Corp.
* Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
*
* Based on copypage-v4wb.S:
* Copyright (C) 1995-1999 Russell King
*/
#include <linux/init.h>
#include <linux/highmem.h>
/*
* Faraday optimised copy_user_page
*/
static void fa_copy_user_page(void *kto, const void *kfrom)
{
int tmp;
asm volatile ("\
1: ldmia %1!, {r3, r4, ip, lr} @ 4\n\
stmia %0, {r3, r4, ip, lr} @ 4\n\
mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
add %0, %0, #16 @ 1\n\
ldmia %1!, {r3, r4, ip, lr} @ 4\n\
stmia %0, {r3, r4, ip, lr} @ 4\n\
mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
add %0, %0, #16 @ 1\n\
subs %2, %2, #1 @ 1\n\
bne 1b @ 1\n\
mcr p15, 0, %2, c7, c10, 4 @ 1 drain WB"
: "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
: "2" (PAGE_SIZE / 32)
: "r3", "r4", "ip", "lr");
}
void fa_copy_user_highpage(struct page *to, struct page *from,
unsigned long vaddr, struct vm_area_struct *vma)
{
void *kto, *kfrom;
kto = kmap_atomic(to);
kfrom = kmap_atomic(from);
fa_copy_user_page(kto, kfrom);
kunmap_atomic(kfrom);
kunmap_atomic(kto);
}
/*
* Faraday optimised clear_user_page
*
* Same story as above.
*/
void fa_clear_user_highpage(struct page *page, unsigned long vaddr)
{
void *ptr, *kaddr = kmap_atomic(page);
asm volatile("\
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\
mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
add %0, %0, #16 @ 1\n\
stmia %0, {r2, r3, ip, lr} @ 4\n\
mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
add %0, %0, #16 @ 1\n\
subs r1, r1, #1 @ 1\n\
bne 1b @ 1\n\
mcr p15, 0, r1, c7, c10, 4 @ 1 drain WB"
: "=r" (ptr)
: "0" (kaddr), "I" (PAGE_SIZE / 32)
: "r1", "r2", "r3", "ip", "lr");
kunmap_atomic(kaddr);
}
struct cpu_user_fns fa_user_fns __initdata = {
.cpu_clear_user_highpage = fa_clear_user_highpage,
.cpu_copy_user_highpage = fa_copy_user_highpage,
};