// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/arch/arm/mm/copypage-feroceon.S
 *
 *  Copyright (C) 2008 Marvell Semiconductors
 *
 * 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 feroceon_copy_user_page(void *kto, const void *kfrom)
{
        int tmp;

        asm volatile ("\
.arch   armv5te                                 \n\
1:      ldmia   %1!, {r2 - r7, ip, lr}          \n\
        pld     [%1, #0]                        \n\
        pld     [%1, #32]                       \n\
        pld     [%1, #64]                       \n\
        pld     [%1, #96]                       \n\
        pld     [%1, #128]                      \n\
        pld     [%1, #160]                      \n\
        pld     [%1, #192]                      \n\
        stmia   %0, {r2 - r7, ip, lr}           \n\
        ldmia   %1!, {r2 - r7, ip, lr}          \n\
        mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
        add     %0, %0, #32                     \n\
        stmia   %0, {r2 - r7, ip, lr}           \n\
        ldmia   %1!, {r2 - r7, ip, lr}          \n\
        mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
        add     %0, %0, #32                     \n\
        stmia   %0, {r2 - r7, ip, lr}           \n\
        ldmia   %1!, {r2 - r7, ip, lr}          \n\
        mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
        add     %0, %0, #32                     \n\
        stmia   %0, {r2 - r7, ip, lr}           \n\
        ldmia   %1!, {r2 - r7, ip, lr}          \n\
        mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
        add     %0, %0, #32                     \n\
        stmia   %0, {r2 - r7, ip, lr}           \n\
        ldmia   %1!, {r2 - r7, ip, lr}          \n\
        mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
        add     %0, %0, #32                     \n\
        stmia   %0, {r2 - r7, ip, lr}           \n\
        ldmia   %1!, {r2 - r7, ip, lr}          \n\
        mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
        add     %0, %0, #32                     \n\
        stmia   %0, {r2 - r7, ip, lr}           \n\
        ldmia   %1!, {r2 - r7, ip, lr}          \n\
        mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
        add     %0, %0, #32                     \n\
        stmia   %0, {r2 - r7, ip, lr}           \n\
        subs    %2, %2, #(32 * 8)               \n\
        mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
        add     %0, %0, #32                     \n\
        bne     1b                              \n\
        mcr     p15, 0, %2, c7, c10, 4          @ drain WB"
        : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
        : "2" (PAGE_SIZE)
        : "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
}

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                          \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     %0, %0, #32                     \n\
        bne     1b                              \n\
        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,
};