[linux.git] / arch / sh / mm / tlb-pteaex.c

/*
 * arch/sh/mm/tlb-pteaex.c
 *
 * TLB operations for SH-X3 CPUs featuring PTE ASID Extensions.
 *
 * Copyright (C) 2009 Paul Mundt
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/io.h>
#include <asm/system.h>
#include <asm/mmu_context.h>
#include <asm/cacheflush.h>

void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
{
	unsigned long flags, pteval, vpn;

	/*
	 * Handle debugger faulting in for debugee.
	 */
	if (vma && current->active_mm != vma->vm_mm)
		return;

	local_irq_save(flags);

	/* Set PTEH register */
	vpn = address & MMU_VPN_MASK;
	__raw_writel(vpn, MMU_PTEH);

	/* Set PTEAEX */
	__raw_writel(get_asid(), MMU_PTEAEX);

	pteval = pte.pte_low;

	/* Set PTEA register */
#ifdef CONFIG_X2TLB
	/*
	 * For the extended mode TLB this is trivial, only the ESZ and
	 * EPR bits need to be written out to PTEA, with the remainder of
	 * the protection bits (with the exception of the compat-mode SZ
	 * and PR bits, which are cleared) being written out in PTEL.
	 */
	__raw_writel(pte.pte_high, MMU_PTEA);
#endif

	/* Set PTEL register */
	pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
#ifdef CONFIG_CACHE_WRITETHROUGH
	pteval |= _PAGE_WT;
#endif
	/* conveniently, we want all the software flags to be 0 anyway */
	__raw_writel(pteval, MMU_PTEL);

	/* Load the TLB */
	asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
	local_irq_restore(flags);
}

/*
 * While SH-X2 extended TLB mode splits out the memory-mapped I/UTLB
 * data arrays, SH-X3 cores with PTEAEX split out the memory-mapped
 * address arrays. In compat mode the second array is inaccessible, while
 * in extended mode, the legacy 8-bit ASID field in address array 1 has
 * undefined behaviour.
 */
void local_flush_tlb_one(unsigned long asid, unsigned long page)
{
	jump_to_uncached();
	__raw_writel(page, MMU_UTLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT);
	__raw_writel(asid, MMU_UTLB_ADDRESS_ARRAY2 | MMU_PAGE_ASSOC_BIT);
	back_to_cached();
}
Commit	Line	Data
8263a67e PM	1	/*
	2	* arch/sh/mm/tlb-pteaex.c
	3	*
	4	* TLB operations for SH-X3 CPUs featuring PTE ASID Extensions.
	5	*
	6	* Copyright (C) 2009 Paul Mundt
	7	*
	8	* This file is subject to the terms and conditions of the GNU General Public
	9	* License. See the file "COPYING" in the main directory of this archive
	10	* for more details.
	11	*/
	12	#include <linux/kernel.h>
	13	#include <linux/mm.h>
	14	#include <linux/io.h>
	15	#include <asm/system.h>
	16	#include <asm/mmu_context.h>
	17	#include <asm/cacheflush.h>
	18
9cef7492	19	void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
8263a67e	20	{
9cef7492	21	unsigned long flags, pteval, vpn;
8263a67e	22
9cef7492 PM	23	/*
	24	* Handle debugger faulting in for debugee.
	25	*/
3ed6e129	26	if (vma && current->active_mm != vma->vm_mm)
8263a67e PM	27	return;
8263a67e PM	28
8263a67e PM	29	local_irq_save(flags);
	30
	31	/* Set PTEH register */
	32	vpn = address & MMU_VPN_MASK;
	33	__raw_writel(vpn, MMU_PTEH);
	34
	35	/* Set PTEAEX */
	36	__raw_writel(get_asid(), MMU_PTEAEX);
	37
	38	pteval = pte.pte_low;
	39
	40	/* Set PTEA register */
	41	#ifdef CONFIG_X2TLB
	42	/*
	43	* For the extended mode TLB this is trivial, only the ESZ and
	44	* EPR bits need to be written out to PTEA, with the remainder of
	45	* the protection bits (with the exception of the compat-mode SZ
	46	* and PR bits, which are cleared) being written out in PTEL.
	47	*/
	48	__raw_writel(pte.pte_high, MMU_PTEA);
8263a67e PM	49	#endif
	50
	51	/* Set PTEL register */
	52	pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
	53	#ifdef CONFIG_CACHE_WRITETHROUGH
	54	pteval \|= _PAGE_WT;
	55	#endif
	56	/* conveniently, we want all the software flags to be 0 anyway */
	57	__raw_writel(pteval, MMU_PTEL);
	58
	59	/* Load the TLB */
	60	asm volatile("ldtlb": /* no output / : / no input */ : "memory");
	61	local_irq_restore(flags);
	62	}
	63
	64	/*
	65	* While SH-X2 extended TLB mode splits out the memory-mapped I/UTLB
	66	* data arrays, SH-X3 cores with PTEAEX split out the memory-mapped
	67	* address arrays. In compat mode the second array is inaccessible, while
	68	* in extended mode, the legacy 8-bit ASID field in address array 1 has
	69	* undefined behaviour.
	70	*/
2dc2f8e0	71	void local_flush_tlb_one(unsigned long asid, unsigned long page)
8263a67e PM	72	{
	73	jump_to_uncached();
	74	__raw_writel(page, MMU_UTLB_ADDRESS_ARRAY \| MMU_PAGE_ASSOC_BIT);
	75	__raw_writel(asid, MMU_UTLB_ADDRESS_ARRAY2 \| MMU_PAGE_ASSOC_BIT);
	76	back_to_cached();
	77	}