[mirror_ubuntu-eoan-kernel.git] / arch / hexagon / mm / vm_tlb.c

/*
 * Hexagon Virtual Machine TLB functions
 *
 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

/*
 * The Hexagon Virtual Machine conceals the real workings of
 * the TLB, but there are one or two functions that need to
 * be instantiated for it, differently from a native build.
 */
#include <linux/mm.h>
#include <linux/sched.h>
#include <asm/page.h>
#include <asm/hexagon_vm.h>

/*
 * Initial VM implementation has only one map active at a time, with
 * TLB purgings on changes.  So either we're nuking the current map,
 * or it's a no-op.  This operation is messy on true SMPs where other
 * processors must be induced to flush the copies in their local TLBs,
 * but Hexagon thread-based virtual processors share the same MMU.
 */
void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
			unsigned long end)
{
	struct mm_struct *mm = vma->vm_mm;

	if (mm->context.ptbase == current->active_mm->context.ptbase)
		__vmclrmap((void *)start, end - start);
}

/*
 * Flush a page from the kernel virtual map - used by highmem
 */
void flush_tlb_one(unsigned long vaddr)
{
	__vmclrmap((void *)vaddr, PAGE_SIZE);
}

/*
 * Flush all TLBs across all CPUs, virtual or real.
 * A single Hexagon core has 6 thread contexts but
 * only one TLB.
 */
void tlb_flush_all(void)
{
	/*  should probably use that fixaddr end or whateve label  */
	__vmclrmap(0, 0xffff0000);
}

/*
 * Flush TLB entries associated with a given mm_struct mapping.
 */
void flush_tlb_mm(struct mm_struct *mm)
{
	/* Current Virtual Machine has only one map active at a time */
	if (current->active_mm->context.ptbase == mm->context.ptbase)
		tlb_flush_all();
}

/*
 * Flush TLB state associated with a page of a vma.
 */
void flush_tlb_page(struct vm_area_struct *vma, unsigned long vaddr)
{
	struct mm_struct *mm = vma->vm_mm;

	if (mm->context.ptbase  == current->active_mm->context.ptbase)
		__vmclrmap((void *)vaddr, PAGE_SIZE);
}

/*
 * Flush TLB entries associated with a kernel address range.
 * Like flush range, but without the check on the vma->vm_mm.
 */
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
		__vmclrmap((void *)start, end - start);
}
Commit	Line	Data
5df87c15 RK	1	/*
	2	* Hexagon Virtual Machine TLB functions
	3	*
e1858b2a	4	* Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
5df87c15 RK	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 and
	8	* only version 2 as published by the Free Software Foundation.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
	18	* 02110-1301, USA.
	19	*/
	20
	21	/*
	22	* The Hexagon Virtual Machine conceals the real workings of
	23	* the TLB, but there are one or two functions that need to
	24	* be instantiated for it, differently from a native build.
	25	*/
	26	#include <linux/mm.h>
00f3ca2c	27	#include <linux/sched.h>
5df87c15 RK	28	#include <asm/page.h>
	29	#include <asm/hexagon_vm.h>
	30
	31	/*
	32	* Initial VM implementation has only one map active at a time, with
	33	* TLB purgings on changes. So either we're nuking the current map,
	34	* or it's a no-op. This operation is messy on true SMPs where other
	35	* processors must be induced to flush the copies in their local TLBs,
	36	* but Hexagon thread-based virtual processors share the same MMU.
	37	*/
	38	void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
	39	unsigned long end)
	40	{
	41	struct mm_struct *mm = vma->vm_mm;
	42
	43	if (mm->context.ptbase == current->active_mm->context.ptbase)
	44	__vmclrmap((void *)start, end - start);
	45	}
	46
	47	/*
	48	* Flush a page from the kernel virtual map - used by highmem
	49	*/
	50	void flush_tlb_one(unsigned long vaddr)
	51	{
	52	__vmclrmap((void *)vaddr, PAGE_SIZE);
	53	}
	54
	55	/*
	56	* Flush all TLBs across all CPUs, virtual or real.
	57	* A single Hexagon core has 6 thread contexts but
	58	* only one TLB.
	59	*/
	60	void tlb_flush_all(void)
	61	{
	62	/* should probably use that fixaddr end or whateve label */
	63	__vmclrmap(0, 0xffff0000);
	64	}
	65
	66	/*
	67	* Flush TLB entries associated with a given mm_struct mapping.
	68	*/
	69	void flush_tlb_mm(struct mm_struct *mm)
	70	{
	71	/* Current Virtual Machine has only one map active at a time */
	72	if (current->active_mm->context.ptbase == mm->context.ptbase)
	73	tlb_flush_all();
	74	}
	75
	76	/*
	77	* Flush TLB state associated with a page of a vma.
	78	*/
	79	void flush_tlb_page(struct vm_area_struct *vma, unsigned long vaddr)
	80	{
	81	struct mm_struct *mm = vma->vm_mm;
	82
	83	if (mm->context.ptbase == current->active_mm->context.ptbase)
	84	__vmclrmap((void *)vaddr, PAGE_SIZE);
	85	}
	86
	87	/*
	88	* Flush TLB entries associated with a kernel address range.
	89	* Like flush range, but without the check on the vma->vm_mm.
	90	*/
	91	void flush_tlb_kernel_range(unsigned long start, unsigned long end)
92	{
93	__vmclrmap((void *)start, end - start);
94	}