mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 05:34:00 +08:00
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>
103 lines
2.5 KiB
C
103 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* linux/arch/arm/mm/copypage-xsc3.S
|
|
*
|
|
* Copyright (C) 2004 Intel Corp.
|
|
*
|
|
* Adapted for 3rd gen XScale core, no more mini-dcache
|
|
* Author: Matt Gilbert (matthew.m.gilbert@intel.com)
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/highmem.h>
|
|
|
|
/*
|
|
* General note:
|
|
* We don't really want write-allocate cache behaviour for these functions
|
|
* since that will just eat through 8K of the cache.
|
|
*/
|
|
|
|
/*
|
|
* XSC3 optimised copy_user_highpage
|
|
*
|
|
* The source page may have some clean entries in the cache already, but we
|
|
* can safely ignore them - break_cow() will flush them out of the cache
|
|
* if we eventually end up using our copied page.
|
|
*
|
|
*/
|
|
static void xsc3_mc_copy_user_page(void *kto, const void *kfrom)
|
|
{
|
|
int tmp;
|
|
|
|
asm volatile ("\
|
|
pld [%1, #0] \n\
|
|
pld [%1, #32] \n\
|
|
1: pld [%1, #64] \n\
|
|
pld [%1, #96] \n\
|
|
\n\
|
|
2: ldrd r2, r3, [%1], #8 \n\
|
|
ldrd r4, r5, [%1], #8 \n\
|
|
mcr p15, 0, %0, c7, c6, 1 @ invalidate\n\
|
|
strd r2, r3, [%0], #8 \n\
|
|
ldrd r2, r3, [%1], #8 \n\
|
|
strd r4, r5, [%0], #8 \n\
|
|
ldrd r4, r5, [%1], #8 \n\
|
|
strd r2, r3, [%0], #8 \n\
|
|
strd r4, r5, [%0], #8 \n\
|
|
ldrd r2, r3, [%1], #8 \n\
|
|
ldrd r4, r5, [%1], #8 \n\
|
|
mcr p15, 0, %0, c7, c6, 1 @ invalidate\n\
|
|
strd r2, r3, [%0], #8 \n\
|
|
ldrd r2, r3, [%1], #8 \n\
|
|
subs %2, %2, #1 \n\
|
|
strd r4, r5, [%0], #8 \n\
|
|
ldrd r4, r5, [%1], #8 \n\
|
|
strd r2, r3, [%0], #8 \n\
|
|
strd r4, r5, [%0], #8 \n\
|
|
bgt 1b \n\
|
|
beq 2b "
|
|
: "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
|
|
: "2" (PAGE_SIZE / 64 - 1)
|
|
: "r2", "r3", "r4", "r5");
|
|
}
|
|
|
|
void xsc3_mc_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);
|
|
flush_cache_page(vma, vaddr, page_to_pfn(from));
|
|
xsc3_mc_copy_user_page(kto, kfrom);
|
|
kunmap_atomic(kfrom);
|
|
kunmap_atomic(kto);
|
|
}
|
|
|
|
/*
|
|
* XScale optimised clear_user_page
|
|
*/
|
|
void xsc3_mc_clear_user_highpage(struct page *page, unsigned long vaddr)
|
|
{
|
|
void *ptr, *kaddr = kmap_atomic(page);
|
|
asm volatile ("\
|
|
mov r1, %2 \n\
|
|
mov r2, #0 \n\
|
|
mov r3, #0 \n\
|
|
1: mcr p15, 0, %0, c7, c6, 1 @ invalidate line\n\
|
|
strd r2, r3, [%0], #8 \n\
|
|
strd r2, r3, [%0], #8 \n\
|
|
strd r2, r3, [%0], #8 \n\
|
|
strd r2, r3, [%0], #8 \n\
|
|
subs r1, r1, #1 \n\
|
|
bne 1b"
|
|
: "=r" (ptr)
|
|
: "0" (kaddr), "I" (PAGE_SIZE / 32)
|
|
: "r1", "r2", "r3");
|
|
kunmap_atomic(kaddr);
|
|
}
|
|
|
|
struct cpu_user_fns xsc3_mc_user_fns __initdata = {
|
|
.cpu_clear_user_highpage = xsc3_mc_clear_user_highpage,
|
|
.cpu_copy_user_highpage = xsc3_mc_copy_user_highpage,
|
|
};
|