[net-next-2.6.git] / arch / arm / mm / copypage-xsc3.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, KM_USER0);
	kfrom = kmap_atomic(from, KM_USER1);
	flush_cache_page(vma, vaddr, page_to_pfn(from));
	xsc3_mc_copy_user_page(kto, kfrom);
	kunmap_atomic(kfrom, KM_USER1);
	kunmap_atomic(kto, KM_USER0);
}

/*
 * 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, KM_USER0);
	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, KM_USER0);
}

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,
};
Commit	Line	Data
d73e60b7 RK	1	/*
	2	* linux/arch/arm/mm/copypage-xsc3.S
	3	*
	4	* Copyright (C) 2004 Intel Corp.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*
	10	* Adapted for 3rd gen XScale core, no more mini-dcache
	11	* Author: Matt Gilbert (matthew.m.gilbert@intel.com)
	12	*/
	13	#include <linux/init.h>
063b0a42	14	#include <linux/highmem.h>
d73e60b7 RK	15
	16	/*
	17	* General note:
	18	* We don't really want write-allocate cache behaviour for these functions
	19	* since that will just eat through 8K of the cache.
	20	*/
	21
	22	/*
063b0a42	23	* XSC3 optimised copy_user_highpage
d73e60b7 RK	24	* r0 = destination
d73e60b7 RK	25	* r1 = source
d73e60b7 RK	26	*
	27	* The source page may have some clean entries in the cache already, but we
	28	* can safely ignore them - break_cow() will flush them out of the cache
	29	* if we eventually end up using our copied page.
	30	*
	31	*/
446c92b2	32	static void __naked
063b0a42	33	xsc3_mc_copy_user_page(void kto, const void kfrom)
d73e60b7 RK	34	{
	35	asm("\
	36	stmfd sp!, {r4, r5, lr} \n\
9a40ac86	37	mov lr, %2 \n\
d73e60b7 RK	38	\n\
	39	pld [r1, #0] \n\
	40	pld [r1, #32] \n\
	41	1: pld [r1, #64] \n\
	42	pld [r1, #96] \n\
	43	\n\
	44	2: ldrd r2, [r1], #8 \n\
	45	mov ip, r0 \n\
	46	ldrd r4, [r1], #8 \n\
	47	mcr p15, 0, ip, c7, c6, 1 @ invalidate\n\
	48	strd r2, [r0], #8 \n\
	49	ldrd r2, [r1], #8 \n\
	50	strd r4, [r0], #8 \n\
	51	ldrd r4, [r1], #8 \n\
	52	strd r2, [r0], #8 \n\
	53	strd r4, [r0], #8 \n\
	54	ldrd r2, [r1], #8 \n\
	55	mov ip, r0 \n\
	56	ldrd r4, [r1], #8 \n\
	57	mcr p15, 0, ip, c7, c6, 1 @ invalidate\n\
	58	strd r2, [r0], #8 \n\
	59	ldrd r2, [r1], #8 \n\
	60	subs lr, lr, #1 \n\
	61	strd r4, [r0], #8 \n\
	62	ldrd r4, [r1], #8 \n\
	63	strd r2, [r0], #8 \n\
	64	strd r4, [r0], #8 \n\
	65	bgt 1b \n\
	66	beq 2b \n\
	67	\n\
	68	ldmfd sp!, {r4, r5, pc}"
	69	:
9a40ac86	70	: "r" (kto), "r" (kfrom), "I" (PAGE_SIZE / 64 - 1));
d73e60b7 RK	71	}
d73e60b7 RK	72
063b0a42	73	void xsc3_mc_copy_user_highpage(struct page to, struct page from,
f00a75c0	74	unsigned long vaddr, struct vm_area_struct *vma)
063b0a42 RK	75	{
	76	void kto, kfrom;
	77
	78	kto = kmap_atomic(to, KM_USER0);
	79	kfrom = kmap_atomic(from, KM_USER1);
2725898f	80	flush_cache_page(vma, vaddr, page_to_pfn(from));
063b0a42 RK	81	xsc3_mc_copy_user_page(kto, kfrom);
	82	kunmap_atomic(kfrom, KM_USER1);
	83	kunmap_atomic(kto, KM_USER0);
	84	}
	85
d73e60b7 RK	86	/*
	87	* XScale optimised clear_user_page
	88	* r0 = destination
	89	* r1 = virtual user address of ultimate destination page
	90	*/
303c6443	91	void xsc3_mc_clear_user_highpage(struct page *page, unsigned long vaddr)
d73e60b7	92	{
43ae286b NP	93	void ptr, kaddr = kmap_atomic(page, KM_USER0);
	94	asm volatile ("\
	95	mov r1, %2 \n\
d73e60b7 RK	96	mov r2, #0 \n\
d73e60b7 RK	97	mov r3, #0 \n\
303c6443 RK	98	1: mcr p15, 0, %0, c7, c6, 1 @ invalidate line\n\
	99	strd r2, [%0], #8 \n\
	100	strd r2, [%0], #8 \n\
	101	strd r2, [%0], #8 \n\
	102	strd r2, [%0], #8 \n\
d73e60b7	103	subs r1, r1, #1 \n\
303c6443	104	bne 1b"
43ae286b NP	105	: "=r" (ptr)
43ae286b NP	106	: "0" (kaddr), "I" (PAGE_SIZE / 32)
303c6443 RK	107	: "r1", "r2", "r3");
303c6443 RK	108	kunmap_atomic(kaddr, KM_USER0);
d73e60b7 RK	109	}
	110
	111	struct cpu_user_fns xsc3_mc_user_fns __initdata = {
303c6443	112	.cpu_clear_user_highpage = xsc3_mc_clear_user_highpage,
063b0a42	113	.cpu_copy_user_highpage = xsc3_mc_copy_user_highpage,
d73e60b7	114	};