arch/sh/mm/cache-sh4.c - linux - Git at Google

 /*
  * arch/sh/mm/cache-sh4.c
  *
  * Copyright (C) 1999, 2000, 2002  Niibe Yutaka
  * Copyright (C) 2001, 2002, 2003, 2004  Paul Mundt
  * Copyright (C) 2003  Richard Curnow
  *
  * 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/config.h>
 #include <linux/init.h>
 #include <linux/mman.h>
 #include <linux/mm.h>
 #include <linux/threads.h>
 #include <asm/addrspace.h>
 #include <asm/page.h>
 #include <asm/pgtable.h>
 #include <asm/processor.h>
 #include <asm/cache.h>
 #include <asm/io.h>
 #include <asm/uaccess.h>
 #include <asm/pgalloc.h>
 #include <asm/mmu_context.h>
 #include <asm/cacheflush.h>

 extern void __flush_cache_4096_all(unsigned long start);
 static void __flush_cache_4096_all_ex(unsigned long start);
 extern void __flush_dcache_all(void);
 static void __flush_dcache_all_ex(void);

 /*
  * SH-4 has virtually indexed and physically tagged cache.
  */

 struct semaphore p3map_sem[4];

 void __init p3_cache_init(void)
 {
 	if (remap_area_pages(P3SEG, 0, PAGE_SIZE*4, _PAGE_CACHABLE))
 		panic("%s failed.", __FUNCTION__);

 	sema_init (&p3map_sem[0], 1);
 	sema_init (&p3map_sem[1], 1);
 	sema_init (&p3map_sem[2], 1);
 	sema_init (&p3map_sem[3], 1);
 }

 /*
  * Write back the dirty D-caches, but not invalidate them.
  *
  * START: Virtual Address (U0, P1, or P3)
  * SIZE: Size of the region.
  */
 void __flush_wback_region(void *start, int size)
 {
 	unsigned long v;
 	unsigned long begin, end;

 	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
 	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
 		& ~(L1_CACHE_BYTES-1);
 	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
 		asm volatile("ocbwb	%0"
 			     : /* no output */
 			     : "m" (__m(v)));
 	}
 }

 /*
  * Write back the dirty D-caches and invalidate them.
  *
  * START: Virtual Address (U0, P1, or P3)
  * SIZE: Size of the region.
  */
 void __flush_purge_region(void *start, int size)
 {
 	unsigned long v;
 	unsigned long begin, end;

 	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
 	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
 		& ~(L1_CACHE_BYTES-1);
 	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
 		asm volatile("ocbp	%0"
 			     : /* no output */
 			     : "m" (__m(v)));
 	}
 }


 /*
  * No write back please
  */
 void __flush_invalidate_region(void *start, int size)
 {
 	unsigned long v;
 	unsigned long begin, end;

 	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
 	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
 		& ~(L1_CACHE_BYTES-1);
 	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
 		asm volatile("ocbi	%0"
 			     : /* no output */
 			     : "m" (__m(v)));
 	}
 }

 static void __flush_dcache_all_ex(void)
 {
 	unsigned long addr, end_addr, entry_offset;

 	end_addr = CACHE_OC_ADDRESS_ARRAY + (cpu_data->dcache.sets << cpu_data->dcache.entry_shift) * cpu_data->dcache.ways;
 	entry_offset = 1 << cpu_data->dcache.entry_shift;
 	for (addr = CACHE_OC_ADDRESS_ARRAY; addr < end_addr; addr += entry_offset) {
 		ctrl_outl(0, addr);
 	}
 }

 static void __flush_cache_4096_all_ex(unsigned long start)
 {
 	unsigned long addr, entry_offset;
 	int i;

 	entry_offset = 1 << cpu_data->dcache.entry_shift;
 	for (i = 0; i < cpu_data->dcache.ways; i++, start += cpu_data->dcache.way_incr) {
 		for (addr = CACHE_OC_ADDRESS_ARRAY + start;
 		     addr < CACHE_OC_ADDRESS_ARRAY + 4096 + start;
 		     addr += entry_offset) {
 			ctrl_outl(0, addr);
 		}
 	}
 }

 void flush_cache_4096_all(unsigned long start)
 {
 	if (cpu_data->dcache.ways == 1)
 		__flush_cache_4096_all(start);
 	else
 		__flush_cache_4096_all_ex(start);
 }

 /*
  * Write back the range of D-cache, and purge the I-cache.
  *
  * Called from kernel/module.c:sys_init_module and routine for a.out format.
  */
 void flush_icache_range(unsigned long start, unsigned long end)
 {
 	flush_cache_all();
 }

 /*
  * Write back the D-cache and purge the I-cache for signal trampoline.
  * .. which happens to be the same behavior as flush_icache_range().
  * So, we simply flush out a line.
  */
 void flush_cache_sigtramp(unsigned long addr)
 {
 	unsigned long v, index;
 	unsigned long flags;
 	int i;

 	v = addr & ~(L1_CACHE_BYTES-1);
 	asm volatile("ocbwb	%0"
 		     : /* no output */
 		     : "m" (__m(v)));

 	index = CACHE_IC_ADDRESS_ARRAY | (v & cpu_data->icache.entry_mask);

 	local_irq_save(flags);
 	jump_to_P2();
 	for(i = 0; i < cpu_data->icache.ways; i++, index += cpu_data->icache.way_incr)
 		ctrl_outl(0, index);	/* Clear out Valid-bit */
 	back_to_P1();
 	local_irq_restore(flags);
 }

 static inline void flush_cache_4096(unsigned long start,
 				    unsigned long phys)
 {
 	unsigned long flags;
 	extern void __flush_cache_4096(unsigned long addr, unsigned long phys, unsigned long exec_offset);

 	/*
 	 * SH7751, SH7751R, and ST40 have no restriction to handle cache.
 	 * (While SH7750 must do that at P2 area.)
 	 */
 	if ((cpu_data->flags & CPU_HAS_P2_FLUSH_BUG)
 	   || start < CACHE_OC_ADDRESS_ARRAY) {
 		local_irq_save(flags);
 		__flush_cache_4096(start | SH_CACHE_ASSOC, P1SEGADDR(phys), 0x20000000);
 		local_irq_restore(flags);
 	} else {
 		__flush_cache_4096(start | SH_CACHE_ASSOC, P1SEGADDR(phys), 0);
 	}
 }

 /*
  * Write back & invalidate the D-cache of the page.
  * (To avoid "alias" issues)
  */
 void flush_dcache_page(struct page *page)
 {
 	if (test_bit(PG_mapped, &page->flags)) {
 		unsigned long phys = PHYSADDR(page_address(page));

 		/* Loop all the D-cache */
 		flush_cache_4096(CACHE_OC_ADDRESS_ARRAY,          phys);
 		flush_cache_4096(CACHE_OC_ADDRESS_ARRAY | 0x1000, phys);
 		flush_cache_4096(CACHE_OC_ADDRESS_ARRAY | 0x2000, phys);
 		flush_cache_4096(CACHE_OC_ADDRESS_ARRAY | 0x3000, phys);
 	}
 }

 static inline void flush_icache_all(void)
 {
 	unsigned long flags, ccr;

 	local_irq_save(flags);
 	jump_to_P2();

 	/* Flush I-cache */
 	ccr = ctrl_inl(CCR);
 	ccr |= CCR_CACHE_ICI;
 	ctrl_outl(ccr, CCR);

 	back_to_P1();
 	local_irq_restore(flags);
 }

 void flush_cache_all(void)
 {
 	if (cpu_data->dcache.ways == 1)
 		__flush_dcache_all();
 	else
 		__flush_dcache_all_ex();
 	flush_icache_all();
 }

 void flush_cache_mm(struct mm_struct *mm)
 {
 	/* Is there any good way? */
 	/* XXX: possibly call flush_cache_range for each vm area */
 	/*
 	 * FIXME: Really, the optimal solution here would be able to flush out
 	 * individual lines created by the specified context, but this isn't
 	 * feasible for a number of architectures (such as MIPS, and some
 	 * SPARC) .. is this possible for SuperH?
 	 *
 	 * In the meantime, we'll just flush all of the caches.. this
 	 * seems to be the simplest way to avoid at least a few wasted
 	 * cache flushes. -Lethal
 	 */
 	flush_cache_all();
 }

 /*
  * Write back and invalidate I/D-caches for the page.
  *
  * ADDR: Virtual Address (U0 address)
  * PFN: Physical page number
  */
 void flush_cache_page(struct vm_area_struct *vma, unsigned long address, unsigned long pfn)
 {
 	unsigned long phys = pfn << PAGE_SHIFT;

 	/* We only need to flush D-cache when we have alias */
 	if ((address^phys) & CACHE_ALIAS) {
 		/* Loop 4K of the D-cache */
 		flush_cache_4096(
 			CACHE_OC_ADDRESS_ARRAY | (address & CACHE_ALIAS),
 			phys);
 		/* Loop another 4K of the D-cache */
 		flush_cache_4096(
 			CACHE_OC_ADDRESS_ARRAY | (phys & CACHE_ALIAS),
 			phys);
 	}

 	if (vma->vm_flags & VM_EXEC)
 		/* Loop 4K (half) of the I-cache */
 		flush_cache_4096(
 			CACHE_IC_ADDRESS_ARRAY | (address & 0x1000),
 			phys);
 }

 /*
  * Write back and invalidate D-caches.
  *
  * START, END: Virtual Address (U0 address)
  *
  * NOTE: We need to flush the _physical_ page entry.
  * Flushing the cache lines for U0 only isn't enough.
  * We need to flush for P1 too, which may contain aliases.
  */
 void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
 		       unsigned long end)
 {
 	unsigned long p = start & PAGE_MASK;
 	pgd_t *dir;
 	pmd_t *pmd;
 	pte_t *pte;
 	pte_t entry;
 	unsigned long phys;
 	unsigned long d = 0;

 	dir = pgd_offset(vma->vm_mm, p);
 	pmd = pmd_offset(dir, p);

 	do {
 		if (pmd_none(*pmd) || pmd_bad(*pmd)) {
 			p &= ~((1 << PMD_SHIFT) -1);
 			p += (1 << PMD_SHIFT);
 			pmd++;
 			continue;
 		}
 		pte = pte_offset_kernel(pmd, p);
 		do {
 			entry = *pte;
 			if ((pte_val(entry) & _PAGE_PRESENT)) {
 				phys = pte_val(entry)&PTE_PHYS_MASK;
 				if ((p^phys) & CACHE_ALIAS) {
 					d |= 1 << ((p & CACHE_ALIAS)>>12);
 					d |= 1 << ((phys & CACHE_ALIAS)>>12);
 					if (d == 0x0f)
 						goto loop_exit;
 				}
 			}
 			pte++;
 			p += PAGE_SIZE;
 		} while (p < end && ((unsigned long)pte & ~PAGE_MASK));
 		pmd++;
 	} while (p < end);
  loop_exit:
 	if (d & 1)
 		flush_cache_4096_all(0);
 	if (d & 2)
 		flush_cache_4096_all(0x1000);
 	if (d & 4)
 		flush_cache_4096_all(0x2000);
 	if (d & 8)
 		flush_cache_4096_all(0x3000);
 	if (vma->vm_flags & VM_EXEC)
 		flush_icache_all();
 }

 /*
  * flush_icache_user_range
  * @vma: VMA of the process
  * @page: page
  * @addr: U0 address
  * @len: length of the range (< page size)
  */
 void flush_icache_user_range(struct vm_area_struct *vma,
 			     struct page *page, unsigned long addr, int len)
 {
 	flush_cache_page(vma, addr, page_to_pfn(page));
 }
	/*
	* arch/sh/mm/cache-sh4.c
	*
	* Copyright (C) 1999, 2000, 2002 Niibe Yutaka
	* Copyright (C) 2001, 2002, 2003, 2004 Paul Mundt
	* Copyright (C) 2003 Richard Curnow
	*
	* 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/config.h>
	#include <linux/init.h>
	#include <linux/mman.h>
	#include <linux/mm.h>
	#include <linux/threads.h>
	#include <asm/addrspace.h>
	#include <asm/page.h>
	#include <asm/pgtable.h>
	#include <asm/processor.h>
	#include <asm/cache.h>
	#include <asm/io.h>
	#include <asm/uaccess.h>
	#include <asm/pgalloc.h>
	#include <asm/mmu_context.h>
	#include <asm/cacheflush.h>

	extern void __flush_cache_4096_all(unsigned long start);
	static void __flush_cache_4096_all_ex(unsigned long start);
	extern void __flush_dcache_all(void);
	static void __flush_dcache_all_ex(void);

	/*
	* SH-4 has virtually indexed and physically tagged cache.
	*/

	struct semaphore p3map_sem[4];

	void __init p3_cache_init(void)
	{
	if (remap_area_pages(P3SEG, 0, PAGE_SIZE*4, _PAGE_CACHABLE))
	panic("%s failed.", __FUNCTION__);

	sema_init (&p3map_sem[0], 1);
	sema_init (&p3map_sem[1], 1);
	sema_init (&p3map_sem[2], 1);
	sema_init (&p3map_sem[3], 1);
	}

	/*
	* Write back the dirty D-caches, but not invalidate them.
	*
	* START: Virtual Address (U0, P1, or P3)
	* SIZE: Size of the region.
	*/
	void __flush_wback_region(void *start, int size)
	{
	unsigned long v;
	unsigned long begin, end;

	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
	& ~(L1_CACHE_BYTES-1);
	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
	asm volatile("ocbwb %0"
	: /* no output */
	: "m" (__m(v)));
	}
	}

	/*
	* Write back the dirty D-caches and invalidate them.
	*
	* START: Virtual Address (U0, P1, or P3)
	* SIZE: Size of the region.
	*/
	void __flush_purge_region(void *start, int size)
	{
	unsigned long v;
	unsigned long begin, end;

	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
	& ~(L1_CACHE_BYTES-1);
	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
	asm volatile("ocbp %0"
	: /* no output */
	: "m" (__m(v)));
	}
	}


	/*
	* No write back please
	*/
	void __flush_invalidate_region(void *start, int size)
	{
	unsigned long v;
	unsigned long begin, end;

	begin = (unsigned long)start & ~(L1_CACHE_BYTES-1);
	end = ((unsigned long)start + size + L1_CACHE_BYTES-1)
	& ~(L1_CACHE_BYTES-1);
	for (v = begin; v < end; v+=L1_CACHE_BYTES) {
	asm volatile("ocbi %0"
	: /* no output */
	: "m" (__m(v)));
	}
	}

	static void __flush_dcache_all_ex(void)
	{
	unsigned long addr, end_addr, entry_offset;

	end_addr = CACHE_OC_ADDRESS_ARRAY + (cpu_data->dcache.sets << cpu_data->dcache.entry_shift) * cpu_data->dcache.ways;
	entry_offset = 1 << cpu_data->dcache.entry_shift;
	for (addr = CACHE_OC_ADDRESS_ARRAY; addr < end_addr; addr += entry_offset) {
	ctrl_outl(0, addr);
	}
	}

	static void __flush_cache_4096_all_ex(unsigned long start)
	{
	unsigned long addr, entry_offset;
	int i;

	entry_offset = 1 << cpu_data->dcache.entry_shift;
	for (i = 0; i < cpu_data->dcache.ways; i++, start += cpu_data->dcache.way_incr) {
	for (addr = CACHE_OC_ADDRESS_ARRAY + start;
	addr < CACHE_OC_ADDRESS_ARRAY + 4096 + start;
	addr += entry_offset) {
	ctrl_outl(0, addr);
	}
	}
	}

	void flush_cache_4096_all(unsigned long start)
	{
	if (cpu_data->dcache.ways == 1)
	__flush_cache_4096_all(start);
	else
	__flush_cache_4096_all_ex(start);
	}

	/*
	* Write back the range of D-cache, and purge the I-cache.
	*
	* Called from kernel/module.c:sys_init_module and routine for a.out format.
	*/
	void flush_icache_range(unsigned long start, unsigned long end)
	{
	flush_cache_all();
	}

	/*
	* Write back the D-cache and purge the I-cache for signal trampoline.
	* .. which happens to be the same behavior as flush_icache_range().
	* So, we simply flush out a line.
	*/
	void flush_cache_sigtramp(unsigned long addr)
	{
	unsigned long v, index;
	unsigned long flags;
	int i;

	v = addr & ~(L1_CACHE_BYTES-1);
	asm volatile("ocbwb %0"
	: /* no output */
	: "m" (__m(v)));

	index = CACHE_IC_ADDRESS_ARRAY \| (v & cpu_data->icache.entry_mask);

	local_irq_save(flags);
	jump_to_P2();
	for(i = 0; i < cpu_data->icache.ways; i++, index += cpu_data->icache.way_incr)
	ctrl_outl(0, index); /* Clear out Valid-bit */
	back_to_P1();
	local_irq_restore(flags);
	}

	static inline void flush_cache_4096(unsigned long start,
	unsigned long phys)
	{
	unsigned long flags;
	extern void __flush_cache_4096(unsigned long addr, unsigned long phys, unsigned long exec_offset);

	/*
	* SH7751, SH7751R, and ST40 have no restriction to handle cache.
	* (While SH7750 must do that at P2 area.)
	*/
	if ((cpu_data->flags & CPU_HAS_P2_FLUSH_BUG)
	\|\| start < CACHE_OC_ADDRESS_ARRAY) {
	local_irq_save(flags);
	__flush_cache_4096(start \| SH_CACHE_ASSOC, P1SEGADDR(phys), 0x20000000);
	local_irq_restore(flags);
	} else {
	__flush_cache_4096(start \| SH_CACHE_ASSOC, P1SEGADDR(phys), 0);
	}
	}

	/*
	* Write back & invalidate the D-cache of the page.
	* (To avoid "alias" issues)
	*/
	void flush_dcache_page(struct page *page)
	{
	if (test_bit(PG_mapped, &page->flags)) {
	unsigned long phys = PHYSADDR(page_address(page));

	/* Loop all the D-cache */
	flush_cache_4096(CACHE_OC_ADDRESS_ARRAY, phys);
	flush_cache_4096(CACHE_OC_ADDRESS_ARRAY \| 0x1000, phys);
	flush_cache_4096(CACHE_OC_ADDRESS_ARRAY \| 0x2000, phys);
	flush_cache_4096(CACHE_OC_ADDRESS_ARRAY \| 0x3000, phys);
	}
	}

	static inline void flush_icache_all(void)
	{
	unsigned long flags, ccr;

	local_irq_save(flags);
	jump_to_P2();

	/* Flush I-cache */
	ccr = ctrl_inl(CCR);
	ccr \|= CCR_CACHE_ICI;
	ctrl_outl(ccr, CCR);

	back_to_P1();
	local_irq_restore(flags);
	}

	void flush_cache_all(void)
	{
	if (cpu_data->dcache.ways == 1)
	__flush_dcache_all();
	else
	__flush_dcache_all_ex();
	flush_icache_all();
	}

	void flush_cache_mm(struct mm_struct *mm)
	{
	/* Is there any good way? */
	/* XXX: possibly call flush_cache_range for each vm area */
	/*
	* FIXME: Really, the optimal solution here would be able to flush out
	* individual lines created by the specified context, but this isn't
	* feasible for a number of architectures (such as MIPS, and some
	* SPARC) .. is this possible for SuperH?
	*
	* In the meantime, we'll just flush all of the caches.. this
	* seems to be the simplest way to avoid at least a few wasted
	* cache flushes. -Lethal
	*/
	flush_cache_all();
	}

	/*
	* Write back and invalidate I/D-caches for the page.
	*
	* ADDR: Virtual Address (U0 address)
	* PFN: Physical page number
	*/
	void flush_cache_page(struct vm_area_struct *vma, unsigned long address, unsigned long pfn)
	{
	unsigned long phys = pfn << PAGE_SHIFT;

	/* We only need to flush D-cache when we have alias */
	if ((address^phys) & CACHE_ALIAS) {
	/* Loop 4K of the D-cache */
	flush_cache_4096(
	CACHE_OC_ADDRESS_ARRAY \| (address & CACHE_ALIAS),
	phys);
	/* Loop another 4K of the D-cache */
	flush_cache_4096(
	CACHE_OC_ADDRESS_ARRAY \| (phys & CACHE_ALIAS),
	phys);
	}

	if (vma->vm_flags & VM_EXEC)
	/* Loop 4K (half) of the I-cache */
	flush_cache_4096(
	CACHE_IC_ADDRESS_ARRAY \| (address & 0x1000),
	phys);
	}

	/*
	* Write back and invalidate D-caches.
	*
	* START, END: Virtual Address (U0 address)
	*
	* NOTE: We need to flush the _physical_ page entry.
	* Flushing the cache lines for U0 only isn't enough.
	* We need to flush for P1 too, which may contain aliases.
	*/
	void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
	unsigned long end)
	{
	unsigned long p = start & PAGE_MASK;
	pgd_t *dir;
	pmd_t *pmd;
	pte_t *pte;
	pte_t entry;
	unsigned long phys;
	unsigned long d = 0;

	dir = pgd_offset(vma->vm_mm, p);
	pmd = pmd_offset(dir, p);

	do {
	if (pmd_none(pmd) \|\| pmd_bad(pmd)) {
	p &= ~((1 << PMD_SHIFT) -1);
	p += (1 << PMD_SHIFT);
	pmd++;
	continue;
	}
	pte = pte_offset_kernel(pmd, p);
	do {
	entry = *pte;
	if ((pte_val(entry) & _PAGE_PRESENT)) {
	phys = pte_val(entry)&PTE_PHYS_MASK;
	if ((p^phys) & CACHE_ALIAS) {
	d \|= 1 << ((p & CACHE_ALIAS)>>12);
	d \|= 1 << ((phys & CACHE_ALIAS)>>12);
	if (d == 0x0f)
	goto loop_exit;
	}
	}
	pte++;
	p += PAGE_SIZE;
	} while (p < end && ((unsigned long)pte & ~PAGE_MASK));
	pmd++;
	} while (p < end);
	loop_exit:
	if (d & 1)
	flush_cache_4096_all(0);
	if (d & 2)
	flush_cache_4096_all(0x1000);
	if (d & 4)
	flush_cache_4096_all(0x2000);
	if (d & 8)
	flush_cache_4096_all(0x3000);
	if (vma->vm_flags & VM_EXEC)
	flush_icache_all();
	}

	/*
	* flush_icache_user_range
	* @vma: VMA of the process
	* @page: page
	* @addr: U0 address
	* @len: length of the range (< page size)
	*/
	void flush_icache_user_range(struct vm_area_struct *vma,
	struct page *page, unsigned long addr, int len)
	{
	flush_cache_page(vma, addr, page_to_pfn(page));
	}