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Diffstat (limited to '')
| -rw-r--r-- | arch/arm/mm/copypage-feroceon.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/arch/arm/mm/copypage-feroceon.c b/arch/arm/mm/copypage-feroceon.c new file mode 100644 index 0000000000..5fc8ef1e66 --- /dev/null +++ b/arch/arm/mm/copypage-feroceon.c @@ -0,0 +1,108 @@ +// 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, +}; + |