mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 22:15:40 +07:00
d2912cb15b
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
83 lines
2.1 KiB
C
83 lines
2.1 KiB
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,
|
|
};
|