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/*
* linux/arch/arm/mm/copypage-feroceon.S
*
* Copyright (C) 2008 Marvell Semiconductors
*
* 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 handles copy_user_highpage and clear_user_page on Feroceon
* more optimally than the generic implementations.
*/
#include <linux/init.h>
#include <linux/highmem.h>
static void __naked
feroceon_copy_user_page(void *kto, const void *kfrom)
{
asm("\
stmfd sp!, {r4-r9, lr}
\
mov ip, %2
\
1: mov lr, r1
\
ldmia r1!, {r2 - r9}
\
pld [lr, #32]
\
pld [lr, #64]
\
pld [lr, #96]
\
pld [lr, #128]
\
pld [lr, #160]
\
pld [lr, #192]
\
pld [lr, #224]
\
stmia r0, {r2 - r9}
\
ldmia r1!, {r2 - r9}
\
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
\
add r0, r0, #32
\
stmia r0, {r2 - r9}
\
ldmia r1!, {r2 - r9}
\
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
\
add r0, r0, #32
\
stmia r0, {r2 - r9}
\
ldmia r1!, {r2 - r9}
\
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
\
add r0, r0, #32
\
stmia r0, {r2 - r9}
\
ldmia r1!, {r2 - r9}
\
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
\
add r0, r0, #32
\
stmia r0, {r2 - r9}
\
ldmia r1!, {r2 - r9}
\
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
\
add r0, r0, #32
\
stmia r0, {r2 - r9}
\
ldmia r1!, {r2 - r9}
\
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
\
add r0, r0, #32
\
stmia r0, {r2 - r9}
\
ldmia r1!, {r2 - r9}
\
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
\
add r0, r0, #32
\
stmia r0, {r2 - r9}
\
subs ip, ip, #(32 * 8)
\
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line
\
add r0, r0, #32
\
bne 1b
\
mcr p15, 0, ip, c7, c10, 4 @ drain WB
\
ldmfd sp!, {r4-r9, pc}"
:
: "r" (kto), "r" (kfrom), "I" (PAGE_SIZE));
}
void feroceon_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));
feroceon_copy_user_page(kto, kfrom);
kunmap_atomic(kfrom);
kunmap_atomic(kto);
}
void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr)
{
void *ptr, *kaddr = kmap_atomic(page);
asm volatile ("\
mov r1, %2
\
mov r2, #0
\
mov r3, #0
\
mov r4, #0
\
mov r5, #0
\
mov r6, #0
\
mov r7, #0
\
mov ip, #0
\
mov lr, #0
\
1: stmia %0, {r2-r7, ip, lr}
\
subs r1, r1, #1
\
mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line
\
add %0, %0, #32
\
bne 1b
\
mcr p15, 0, r1, c7, c10, 4 @ drain WB"
: "=r" (ptr)
: "0" (kaddr), "I" (PAGE_SIZE / 32)
: "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
kunmap_atomic(kaddr);
}
struct cpu_user_fns feroceon_user_fns __initdata = {
.cpu_clear_user_highpage = feroceon_clear_user_highpage,
.cpu_copy_user_highpage = feroceon_copy_user_highpage,
};
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