115 lines
2.8 KiB
C
115 lines
2.8 KiB
C
|
/*
|
||
|
|
* linux/arch/arm/mm/copypage-xsc3.S
|
||
|
|
*
|
||
|
|
* Copyright (C) 2004 Intel Corp.
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*
|
||
|
|
* 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
|
||
|
|
* r0 = destination
|
||
|
|
* r1 = source
|
||
|
|
*
|
||
|
|
* 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 __naked
|
||
|
|
xsc3_mc_copy_user_page(void *kto, const void *kfrom)
|
||
|
|
{
|
||
|
|
asm("\
|
||
|
|
stmfd sp!, {r4, r5, lr} \n\
|
||
|
|
mov lr, %2 \n\
|
||
|
|
\n\
|
||
|
|
pld [r1, #0] \n\
|
||
|
|
pld [r1, #32] \n\
|
||
|
|
1: pld [r1, #64] \n\
|
||
|
|
pld [r1, #96] \n\
|
||
|
|
\n\
|
||
|
|
2: ldrd r2, [r1], #8 \n\
|
||
|
|
mov ip, r0 \n\
|
||
|
|
ldrd r4, [r1], #8 \n\
|
||
|
|
mcr p15, 0, ip, c7, c6, 1 @ invalidate\n\
|
||
|
|
strd r2, [r0], #8 \n\
|
||
|
|
ldrd r2, [r1], #8 \n\
|
||
|
|
strd r4, [r0], #8 \n\
|
||
|
|
ldrd r4, [r1], #8 \n\
|
||
|
|
strd r2, [r0], #8 \n\
|
||
|
|
strd r4, [r0], #8 \n\
|
||
|
|
ldrd r2, [r1], #8 \n\
|
||
|
|
mov ip, r0 \n\
|
||
|
|
ldrd r4, [r1], #8 \n\
|
||
|
|
mcr p15, 0, ip, c7, c6, 1 @ invalidate\n\
|
||
|
|
strd r2, [r0], #8 \n\
|
||
|
|
ldrd r2, [r1], #8 \n\
|
||
|
|
subs lr, lr, #1 \n\
|
||
|
|
strd r4, [r0], #8 \n\
|
||
|
|
ldrd r4, [r1], #8 \n\
|
||
|
|
strd r2, [r0], #8 \n\
|
||
|
|
strd r4, [r0], #8 \n\
|
||
|
|
bgt 1b \n\
|
||
|
|
beq 2b \n\
|
||
|
|
\n\
|
||
|
|
ldmfd sp!, {r4, r5, pc}"
|
||
|
|
:
|
||
|
|
: "r" (kto), "r" (kfrom), "I" (PAGE_SIZE / 64 - 1));
|
||
|
|
}
|
||
|
|
|
||
|
|
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
|
||
|
|
* r0 = destination
|
||
|
|
* r1 = virtual user address of ultimate destination 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, [%0], #8 \n\
|
||
|
|
strd r2, [%0], #8 \n\
|
||
|
|
strd r2, [%0], #8 \n\
|
||
|
|
strd r2, [%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,
|
||
|
|
};
|