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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 __attribute__((naked))
feroceon_copy_user_page(void *kto, const void *kfrom)
{
asm("\
stmfd sp!, {r4-r9, lr} \n\
mov ip, %0 \n\
1: mov lr, r1 \n\
ldmia r1!, {r2 - r9} \n\
pld [lr, #32] \n\
pld [lr, #64] \n\
pld [lr, #96] \n\
pld [lr, #128] \n\
pld [lr, #160] \n\
pld [lr, #192] \n\
pld [lr, #224] \n\
stmia r0, {r2 - r9} \n\
ldmia r1!, {r2 - r9} \n\
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\
add r0, r0, #32 \n\
stmia r0, {r2 - r9} \n\
ldmia r1!, {r2 - r9} \n\
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\
add r0, r0, #32 \n\
stmia r0, {r2 - r9} \n\
ldmia r1!, {r2 - r9} \n\
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\
add r0, r0, #32 \n\
stmia r0, {r2 - r9} \n\
ldmia r1!, {r2 - r9} \n\
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\
add r0, r0, #32 \n\
stmia r0, {r2 - r9} \n\
ldmia r1!, {r2 - r9} \n\
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\
add r0, r0, #32 \n\
stmia r0, {r2 - r9} \n\
ldmia r1!, {r2 - r9} \n\
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\
add r0, r0, #32 \n\
stmia r0, {r2 - r9} \n\
ldmia r1!, {r2 - r9} \n\
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\
add r0, r0, #32 \n\
stmia r0, {r2 - r9} \n\
subs ip, ip, #(32 * 8) \n\
mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\
add r0, r0, #32 \n\
bne 1b \n\
mcr p15, 0, ip, c7, c10, 4 @ drain WB\n\
ldmfd sp!, {r4-r9, pc}"
:
: "I" (PAGE_SIZE));
}
void feroceon_copy_user_highpage(struct page *to, struct page *from,
unsigned long vaddr)
{
void *kto, *kfrom;
kto = kmap_atomic(to, KM_USER0);
kfrom = kmap_atomic(from, KM_USER1);
feroceon_copy_user_page(kto, kfrom);
kunmap_atomic(kfrom, KM_USER1);
kunmap_atomic(kto, KM_USER0);
}
void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr)
{
void *kaddr = kmap_atomic(page, KM_USER0);
asm("\
mov r1, %1 \n\
mov r2, #0 \n\
mov r3, #0 \n\
mov r4, #0 \n\
mov r5, #0 \n\
mov r6, #0 \n\
mov r7, #0 \n\
mov ip, #0 \n\
mov lr, #0 \n\
1: stmia %0, {r2-r7, ip, lr} \n\
subs r1, r1, #1 \n\
mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\
add r0, r0, #32 \n\
bne 1b \n\
mcr p15, 0, r1, c7, c10, 4 @ drain WB"
:
: "r" (kaddr), "I" (PAGE_SIZE / 32)
: "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
kunmap_atomic(kaddr, KM_USER0);
}
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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