[GitHub/mt8127/android_kernel_alcatel_ttab.git] / arch / mn10300 / mm / mmu-context.c

/* MN10300 MMU context allocation and management
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public Licence
 * as published by the Free Software Foundation; either version
 * 2 of the Licence, or (at your option) any later version.
 */
#include <linux/sched.h>
#include <linux/mm.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>

#ifdef CONFIG_MN10300_TLB_USE_PIDR
/*
 * list of the MMU contexts last allocated on each CPU
 */
unsigned long mmu_context_cache[NR_CPUS] = {
	[0 ... NR_CPUS - 1] =
	MMU_CONTEXT_FIRST_VERSION * 2 - (1 - MMU_CONTEXT_TLBPID_LOCK_NR),
};
#endif /* CONFIG_MN10300_TLB_USE_PIDR */

/*
 * preemptively set a TLB entry
 */
void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
{
	unsigned long pteu, ptel, cnx, flags;
	pte_t pte = *ptep;

	addr &= PAGE_MASK;
	ptel = pte_val(pte) & ~(xPTEL_UNUSED1 | xPTEL_UNUSED2);

	/* make sure the context doesn't migrate and defend against
	 * interference from vmalloc'd regions */
	local_irq_save(flags);

	cnx = ~MMU_NO_CONTEXT;
#ifdef CONFIG_MN10300_TLB_USE_PIDR
	cnx = mm_context(vma->vm_mm);
#endif

	if (cnx != MMU_NO_CONTEXT) {
		pteu = addr;
#ifdef CONFIG_MN10300_TLB_USE_PIDR
		pteu |= cnx & MMU_CONTEXT_TLBPID_MASK;
#endif
		if (!(pte_val(pte) & _PAGE_NX)) {
			IPTEU = pteu;
			if (IPTEL & xPTEL_V)
				IPTEL = ptel;
		}
		DPTEU = pteu;
		if (DPTEL & xPTEL_V)
			DPTEL = ptel;
	}

	local_irq_restore(flags);
}
Commit	Line	Data
b920de1b DH	1	/* MN10300 MMU context allocation and management
	2	*
	3	* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public Licence
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the Licence, or (at your option) any later version.
	10	*/
	11	#include <linux/sched.h>
	12	#include <linux/mm.h>
	13	#include <asm/mmu_context.h>
	14	#include <asm/tlbflush.h>
	15
a9bc60eb	16	#ifdef CONFIG_MN10300_TLB_USE_PIDR
b920de1b DH	17	/*
	18	* list of the MMU contexts last allocated on each CPU
	19	*/
	20	unsigned long mmu_context_cache[NR_CPUS] = {
a9bc60eb AT	21	[0 ... NR_CPUS - 1] =
a9bc60eb AT	22	MMU_CONTEXT_FIRST_VERSION * 2 - (1 - MMU_CONTEXT_TLBPID_LOCK_NR),
b920de1b	23	};
a9bc60eb	24	#endif /* CONFIG_MN10300_TLB_USE_PIDR */
b920de1b DH	25
	26	/*
	27	* preemptively set a TLB entry
	28	*/
4b3073e1	29	void update_mmu_cache(struct vm_area_struct vma, unsigned long addr, pte_t ptep)
b920de1b DH	30	{
b920de1b DH	31	unsigned long pteu, ptel, cnx, flags;
4b3073e1	32	pte_t pte = *ptep;
b920de1b DH	33
	34	addr &= PAGE_MASK;
	35	ptel = pte_val(pte) & ~(xPTEL_UNUSED1 \| xPTEL_UNUSED2);
	36
	37	/* make sure the context doesn't migrate and defend against
	38	* interference from vmalloc'd regions */
	39	local_irq_save(flags);
	40
a9bc60eb AT	41	cnx = ~MMU_NO_CONTEXT;
a9bc60eb AT	42	#ifdef CONFIG_MN10300_TLB_USE_PIDR
b920de1b	43	cnx = mm_context(vma->vm_mm);
a9bc60eb	44	#endif
b920de1b DH	45
b920de1b DH	46	if (cnx != MMU_NO_CONTEXT) {
a9bc60eb AT	47	pteu = addr;
	48	#ifdef CONFIG_MN10300_TLB_USE_PIDR
	49	pteu \|= cnx & MMU_CONTEXT_TLBPID_MASK;
	50	#endif
b920de1b DH	51	if (!(pte_val(pte) & _PAGE_NX)) {
	52	IPTEU = pteu;
	53	if (IPTEL & xPTEL_V)
	54	IPTEL = ptel;
	55	}
	56	DPTEU = pteu;
	57	if (DPTEL & xPTEL_V)
	58	DPTEL = ptel;
	59	}
	60
	61	local_irq_restore(flags);
	62	}