arch/m68k/mm/kmap.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  *  linux/arch/m68k/mm/kmap.c
  *
  *  Copyright (C) 1997 Roman Hodek
  *
  *  10/01/99 cleaned up the code and changing to the same interface
  *	     used by other architectures		/Roman Zippel
  */

 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/types.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>

 #include <asm/setup.h>
 #include <asm/page.h>
 #include <asm/io.h>
 #include <asm/tlbflush.h>

 #undef DEBUG

 /*
  * For 040/060 we can use the virtual memory area like other architectures,
  * but for 020/030 we want to use early termination page descriptors and we
  * can't mix this with normal page descriptors, so we have to copy that code
  * (mm/vmalloc.c) and return appropriately aligned addresses.
  */

 #ifdef CPU_M68040_OR_M68060_ONLY

 #define IO_SIZE		PAGE_SIZE

 static inline struct vm_struct *get_io_area(unsigned long size)
 {
 	return get_vm_area(size, VM_IOREMAP);
 }


 static inline void free_io_area(void *addr)
 {
 	vfree((void *)(PAGE_MASK & (unsigned long)addr));
 }

 #else

 #define IO_SIZE		PMD_SIZE

 static struct vm_struct *iolist;

 /*
  * __free_io_area unmaps nearly everything, so be careful
  * Currently it doesn't free pointer/page tables anymore but this
  * wasn't used anyway and might be added later.
  */
 static void __free_io_area(void *addr, unsigned long size)
 {
 	unsigned long virtaddr = (unsigned long)addr;
 	pgd_t *pgd_dir;
 	p4d_t *p4d_dir;
 	pud_t *pud_dir;
 	pmd_t *pmd_dir;
 	pte_t *pte_dir;

 	while ((long)size > 0) {
 		pgd_dir = pgd_offset_k(virtaddr);
 		p4d_dir = p4d_offset(pgd_dir, virtaddr);
 		pud_dir = pud_offset(p4d_dir, virtaddr);
 		if (pud_bad(*pud_dir)) {
 			printk("iounmap: bad pud(%08lx)\n", pud_val(*pud_dir));
 			pud_clear(pud_dir);
 			return;
 		}
 		pmd_dir = pmd_offset(pud_dir, virtaddr);

 #if CONFIG_PGTABLE_LEVELS == 3
 		if (CPU_IS_020_OR_030) {
 			int pmd_type = pmd_val(*pmd_dir) & _DESCTYPE_MASK;

 			if (pmd_type == _PAGE_PRESENT) {
 				pmd_clear(pmd_dir);
 				virtaddr += PMD_SIZE;
 				size -= PMD_SIZE;

 			} else if (pmd_type == 0)
 				continue;
 		}
 #endif

 		if (pmd_bad(*pmd_dir)) {
 			printk("iounmap: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
 			pmd_clear(pmd_dir);
 			return;
 		}
 		pte_dir = pte_offset_kernel(pmd_dir, virtaddr);

 		pte_val(*pte_dir) = 0;
 		virtaddr += PAGE_SIZE;
 		size -= PAGE_SIZE;
 	}

 	flush_tlb_all();
 }

 static struct vm_struct *get_io_area(unsigned long size)
 {
 	unsigned long addr;
 	struct vm_struct **p, *tmp, *area;

 	area = kmalloc(sizeof(*area), GFP_KERNEL);
 	if (!area)
 		return NULL;
 	addr = KMAP_START;
 	for (p = &iolist; (tmp = *p) ; p = &tmp->next) {
 		if (size + addr < (unsigned long)tmp->addr)
 			break;
 		if (addr > KMAP_END-size) {
 			kfree(area);
 			return NULL;
 		}
 		addr = tmp->size + (unsigned long)tmp->addr;
 	}
 	area->addr = (void *)addr;
 	area->size = size + IO_SIZE;
 	area->next = *p;
 	*p = area;
 	return area;
 }

 static inline void free_io_area(void *addr)
 {
 	struct vm_struct **p, *tmp;

 	if (!addr)
 		return;
 	addr = (void *)((unsigned long)addr & -IO_SIZE);
 	for (p = &iolist ; (tmp = *p) ; p = &tmp->next) {
 		if (tmp->addr == addr) {
 			*p = tmp->next;
 			/* remove gap added in get_io_area() */
 			__free_io_area(tmp->addr, tmp->size - IO_SIZE);
 			kfree(tmp);
 			return;
 		}
 	}
 }

 #endif

 /*
  * Map some physical address range into the kernel address space.
  */
 /* Rewritten by Andreas Schwab to remove all races. */

 void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
 {
 	struct vm_struct *area;
 	unsigned long virtaddr, retaddr;
 	long offset;
 	pgd_t *pgd_dir;
 	p4d_t *p4d_dir;
 	pud_t *pud_dir;
 	pmd_t *pmd_dir;
 	pte_t *pte_dir;

 	/*
 	 * Don't allow mappings that wrap..
 	 */
 	if (!size || physaddr > (unsigned long)(-size))
 		return NULL;

 #ifdef CONFIG_AMIGA
 	if (MACH_IS_AMIGA) {
 		if ((physaddr >= 0x40000000) && (physaddr + size < 0x60000000)
 		    && (cacheflag == IOMAP_NOCACHE_SER))
 			return (void __iomem *)physaddr;
 	}
 #endif
 #ifdef CONFIG_VIRT
 	if (MACH_IS_VIRT) {
 		if (physaddr >= 0xff000000 && cacheflag == IOMAP_NOCACHE_SER)
 			return (void __iomem *)physaddr;
 	}
 #endif
 #ifdef CONFIG_COLDFIRE
 	if (__cf_internalio(physaddr))
 		return (void __iomem *) physaddr;
 #endif

 #ifdef DEBUG
 	printk("ioremap: 0x%lx,0x%lx(%d) - ", physaddr, size, cacheflag);
 #endif
 	/*
 	 * Mappings have to be aligned
 	 */
 	offset = physaddr & (IO_SIZE - 1);
 	physaddr &= -IO_SIZE;
 	size = (size + offset + IO_SIZE - 1) & -IO_SIZE;

 	/*
 	 * Ok, go for it..
 	 */
 	area = get_io_area(size);
 	if (!area)
 		return NULL;

 	virtaddr = (unsigned long)area->addr;
 	retaddr = virtaddr + offset;
 #ifdef DEBUG
 	printk("0x%lx,0x%lx,0x%lx", physaddr, virtaddr, retaddr);
 #endif

 	/*
 	 * add cache and table flags to physical address
 	 */
 	if (CPU_IS_040_OR_060) {
 		physaddr |= (_PAGE_PRESENT | _PAGE_GLOBAL040 |
 			     _PAGE_ACCESSED | _PAGE_DIRTY);
 		switch (cacheflag) {
 		case IOMAP_FULL_CACHING:
 			physaddr |= _PAGE_CACHE040;
 			break;
 		case IOMAP_NOCACHE_SER:
 		default:
 			physaddr |= _PAGE_NOCACHE_S;
 			break;
 		case IOMAP_NOCACHE_NONSER:
 			physaddr |= _PAGE_NOCACHE;
 			break;
 		case IOMAP_WRITETHROUGH:
 			physaddr |= _PAGE_CACHE040W;
 			break;
 		}
 	} else {
 		physaddr |= (_PAGE_PRESENT | _PAGE_ACCESSED |
 			     _PAGE_DIRTY | _PAGE_READWRITE);
 		switch (cacheflag) {
 		case IOMAP_NOCACHE_SER:
 		case IOMAP_NOCACHE_NONSER:
 		default:
 			physaddr |= _PAGE_NOCACHE030;
 			break;
 		case IOMAP_FULL_CACHING:
 		case IOMAP_WRITETHROUGH:
 			break;
 		}
 	}

 	while ((long)size > 0) {
 #ifdef DEBUG
 		if (!(virtaddr & (PMD_SIZE-1)))
 			printk ("\npa=%#lx va=%#lx ", physaddr, virtaddr);
 #endif
 		pgd_dir = pgd_offset_k(virtaddr);
 		p4d_dir = p4d_offset(pgd_dir, virtaddr);
 		pud_dir = pud_offset(p4d_dir, virtaddr);
 		pmd_dir = pmd_alloc(&init_mm, pud_dir, virtaddr);
 		if (!pmd_dir) {
 			printk("ioremap: no mem for pmd_dir\n");
 			return NULL;
 		}

 #if CONFIG_PGTABLE_LEVELS == 3
 		if (CPU_IS_020_OR_030) {
 			pmd_val(*pmd_dir) = physaddr;
 			physaddr += PMD_SIZE;
 			virtaddr += PMD_SIZE;
 			size -= PMD_SIZE;
 		} else
 #endif
 		{
 			pte_dir = pte_alloc_kernel(pmd_dir, virtaddr);
 			if (!pte_dir) {
 				printk("ioremap: no mem for pte_dir\n");
 				return NULL;
 			}

 			pte_val(*pte_dir) = physaddr;
 			virtaddr += PAGE_SIZE;
 			physaddr += PAGE_SIZE;
 			size -= PAGE_SIZE;
 		}
 	}
 #ifdef DEBUG
 	printk("\n");
 #endif
 	flush_tlb_all();

 	return (void __iomem *)retaddr;
 }
 EXPORT_SYMBOL(__ioremap);

 /*
  * Unmap an ioremap()ed region again
  */
 void iounmap(void __iomem *addr)
 {
 #ifdef CONFIG_AMIGA
 	if (MACH_IS_AMIGA &&
 	    ((unsigned long)addr >= 0x40000000) &&
 	    ((unsigned long)addr < 0x60000000))
 		return;
 #endif
 #ifdef CONFIG_VIRT
 	if (MACH_IS_VIRT && (unsigned long)addr >= 0xff000000)
 		return;
 #endif
 #ifdef CONFIG_COLDFIRE
 	if (cf_internalio(addr))
 		return;
 #endif
 	free_io_area((__force void *)addr);
 }
 EXPORT_SYMBOL(iounmap);

 /*
  * Set new cache mode for some kernel address space.
  * The caller must push data for that range itself, if such data may already
  * be in the cache.
  */
 void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
 {
 	unsigned long virtaddr = (unsigned long)addr;
 	pgd_t *pgd_dir;
 	p4d_t *p4d_dir;
 	pud_t *pud_dir;
 	pmd_t *pmd_dir;
 	pte_t *pte_dir;

 	if (CPU_IS_040_OR_060) {
 		switch (cmode) {
 		case IOMAP_FULL_CACHING:
 			cmode = _PAGE_CACHE040;
 			break;
 		case IOMAP_NOCACHE_SER:
 		default:
 			cmode = _PAGE_NOCACHE_S;
 			break;
 		case IOMAP_NOCACHE_NONSER:
 			cmode = _PAGE_NOCACHE;
 			break;
 		case IOMAP_WRITETHROUGH:
 			cmode = _PAGE_CACHE040W;
 			break;
 		}
 	} else {
 		switch (cmode) {
 		case IOMAP_NOCACHE_SER:
 		case IOMAP_NOCACHE_NONSER:
 		default:
 			cmode = _PAGE_NOCACHE030;
 			break;
 		case IOMAP_FULL_CACHING:
 		case IOMAP_WRITETHROUGH:
 			cmode = 0;
 		}
 	}

 	while ((long)size > 0) {
 		pgd_dir = pgd_offset_k(virtaddr);
 		p4d_dir = p4d_offset(pgd_dir, virtaddr);
 		pud_dir = pud_offset(p4d_dir, virtaddr);
 		if (pud_bad(*pud_dir)) {
 			printk("iocachemode: bad pud(%08lx)\n", pud_val(*pud_dir));
 			pud_clear(pud_dir);
 			return;
 		}
 		pmd_dir = pmd_offset(pud_dir, virtaddr);

 #if CONFIG_PGTABLE_LEVELS == 3
 		if (CPU_IS_020_OR_030) {
 			unsigned long pmd = pmd_val(*pmd_dir);

 			if ((pmd & _DESCTYPE_MASK) == _PAGE_PRESENT) {
 				*pmd_dir = __pmd((pmd & _CACHEMASK040) | cmode);
 				virtaddr += PMD_SIZE;
 				size -= PMD_SIZE;
 				continue;
 			}
 		}
 #endif

 		if (pmd_bad(*pmd_dir)) {
 			printk("iocachemode: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
 			pmd_clear(pmd_dir);
 			return;
 		}
 		pte_dir = pte_offset_kernel(pmd_dir, virtaddr);

 		pte_val(*pte_dir) = (pte_val(*pte_dir) & _CACHEMASK040) | cmode;
 		virtaddr += PAGE_SIZE;
 		size -= PAGE_SIZE;
 	}

 	flush_tlb_all();
 }
 EXPORT_SYMBOL(kernel_set_cachemode);
	// SPDX-License-Identifier: GPL-2.0
	/*
	* linux/arch/m68k/mm/kmap.c
	*
	* Copyright (C) 1997 Roman Hodek
	*
	* 10/01/99 cleaned up the code and changing to the same interface
	* used by other architectures /Roman Zippel
	*/

	#include <linux/module.h>
	#include <linux/mm.h>
	#include <linux/kernel.h>
	#include <linux/string.h>
	#include <linux/types.h>
	#include <linux/slab.h>
	#include <linux/vmalloc.h>

	#include <asm/setup.h>
	#include <asm/page.h>
	#include <asm/io.h>
	#include <asm/tlbflush.h>

	#undef DEBUG

	/*
	* For 040/060 we can use the virtual memory area like other architectures,
	* but for 020/030 we want to use early termination page descriptors and we
	* can't mix this with normal page descriptors, so we have to copy that code
	* (mm/vmalloc.c) and return appropriately aligned addresses.
	*/

	#ifdef CPU_M68040_OR_M68060_ONLY

	#define IO_SIZE PAGE_SIZE

	static inline struct vm_struct *get_io_area(unsigned long size)
	{
	return get_vm_area(size, VM_IOREMAP);
	}


	static inline void free_io_area(void *addr)
	{
	vfree((void *)(PAGE_MASK & (unsigned long)addr));
	}

	#else

	#define IO_SIZE PMD_SIZE

	static struct vm_struct *iolist;

	/*
	* __free_io_area unmaps nearly everything, so be careful
	* Currently it doesn't free pointer/page tables anymore but this
	* wasn't used anyway and might be added later.
	*/
	static void __free_io_area(void *addr, unsigned long size)
	{
	unsigned long virtaddr = (unsigned long)addr;
	pgd_t *pgd_dir;
	p4d_t *p4d_dir;
	pud_t *pud_dir;
	pmd_t *pmd_dir;
	pte_t *pte_dir;

	while ((long)size > 0) {
	pgd_dir = pgd_offset_k(virtaddr);
	p4d_dir = p4d_offset(pgd_dir, virtaddr);
	pud_dir = pud_offset(p4d_dir, virtaddr);
	if (pud_bad(*pud_dir)) {
	printk("iounmap: bad pud(%08lx)\n", pud_val(*pud_dir));
	pud_clear(pud_dir);
	return;
	}
	pmd_dir = pmd_offset(pud_dir, virtaddr);

	#if CONFIG_PGTABLE_LEVELS == 3
	if (CPU_IS_020_OR_030) {
	int pmd_type = pmd_val(*pmd_dir) & _DESCTYPE_MASK;

	if (pmd_type == _PAGE_PRESENT) {
	pmd_clear(pmd_dir);
	virtaddr += PMD_SIZE;
	size -= PMD_SIZE;

	} else if (pmd_type == 0)
	continue;
	}
	#endif

	if (pmd_bad(*pmd_dir)) {
	printk("iounmap: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
	pmd_clear(pmd_dir);
	return;
	}
	pte_dir = pte_offset_kernel(pmd_dir, virtaddr);

	pte_val(*pte_dir) = 0;
	virtaddr += PAGE_SIZE;
	size -= PAGE_SIZE;
	}

	flush_tlb_all();
	}

	static struct vm_struct *get_io_area(unsigned long size)
	{
	unsigned long addr;
	struct vm_struct *p, tmp, *area;

	area = kmalloc(sizeof(*area), GFP_KERNEL);
	if (!area)
	return NULL;
	addr = KMAP_START;
	for (p = &iolist; (tmp = *p) ; p = &tmp->next) {
	if (size + addr < (unsigned long)tmp->addr)
	break;
	if (addr > KMAP_END-size) {
	kfree(area);
	return NULL;
	}
	addr = tmp->size + (unsigned long)tmp->addr;
	}
	area->addr = (void *)addr;
	area->size = size + IO_SIZE;
	area->next = *p;
	*p = area;
	return area;
	}

	static inline void free_io_area(void *addr)
	{
	struct vm_struct *p, tmp;

	if (!addr)
	return;
	addr = (void *)((unsigned long)addr & -IO_SIZE);
	for (p = &iolist ; (tmp = *p) ; p = &tmp->next) {
	if (tmp->addr == addr) {
	*p = tmp->next;
	/* remove gap added in get_io_area() */
	__free_io_area(tmp->addr, tmp->size - IO_SIZE);
	kfree(tmp);
	return;
	}
	}
	}

	#endif

	/*
	* Map some physical address range into the kernel address space.
	*/
	/* Rewritten by Andreas Schwab to remove all races. */

	void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag)
	{
	struct vm_struct *area;
	unsigned long virtaddr, retaddr;
	long offset;
	pgd_t *pgd_dir;
	p4d_t *p4d_dir;
	pud_t *pud_dir;
	pmd_t *pmd_dir;
	pte_t *pte_dir;

	/*
	* Don't allow mappings that wrap..
	*/
	if (!size \|\| physaddr > (unsigned long)(-size))
	return NULL;

	#ifdef CONFIG_AMIGA
	if (MACH_IS_AMIGA) {
	if ((physaddr >= 0x40000000) && (physaddr + size < 0x60000000)
	&& (cacheflag == IOMAP_NOCACHE_SER))
	return (void __iomem *)physaddr;
	}
	#endif
	#ifdef CONFIG_VIRT
	if (MACH_IS_VIRT) {
	if (physaddr >= 0xff000000 && cacheflag == IOMAP_NOCACHE_SER)
	return (void __iomem *)physaddr;
	}
	#endif
	#ifdef CONFIG_COLDFIRE
	if (__cf_internalio(physaddr))
	return (void __iomem *) physaddr;
	#endif

	#ifdef DEBUG
	printk("ioremap: 0x%lx,0x%lx(%d) - ", physaddr, size, cacheflag);
	#endif
	/*
	* Mappings have to be aligned
	*/
	offset = physaddr & (IO_SIZE - 1);
	physaddr &= -IO_SIZE;
	size = (size + offset + IO_SIZE - 1) & -IO_SIZE;

	/*
	* Ok, go for it..
	*/
	area = get_io_area(size);
	if (!area)
	return NULL;

	virtaddr = (unsigned long)area->addr;
	retaddr = virtaddr + offset;
	#ifdef DEBUG
	printk("0x%lx,0x%lx,0x%lx", physaddr, virtaddr, retaddr);
	#endif

	/*
	* add cache and table flags to physical address
	*/
	if (CPU_IS_040_OR_060) {
	physaddr \|= (_PAGE_PRESENT \| _PAGE_GLOBAL040 \|
	_PAGE_ACCESSED \| _PAGE_DIRTY);
	switch (cacheflag) {
	case IOMAP_FULL_CACHING:
	physaddr \|= _PAGE_CACHE040;
	break;
	case IOMAP_NOCACHE_SER:
	default:
	physaddr \|= _PAGE_NOCACHE_S;
	break;
	case IOMAP_NOCACHE_NONSER:
	physaddr \|= _PAGE_NOCACHE;
	break;
	case IOMAP_WRITETHROUGH:
	physaddr \|= _PAGE_CACHE040W;
	break;
	}
	} else {
	physaddr \|= (_PAGE_PRESENT \| _PAGE_ACCESSED \|
	_PAGE_DIRTY \| _PAGE_READWRITE);
	switch (cacheflag) {
	case IOMAP_NOCACHE_SER:
	case IOMAP_NOCACHE_NONSER:
	default:
	physaddr \|= _PAGE_NOCACHE030;
	break;
	case IOMAP_FULL_CACHING:
	case IOMAP_WRITETHROUGH:
	break;
	}
	}

	while ((long)size > 0) {
	#ifdef DEBUG
	if (!(virtaddr & (PMD_SIZE-1)))
	printk ("\npa=%#lx va=%#lx ", physaddr, virtaddr);
	#endif
	pgd_dir = pgd_offset_k(virtaddr);
	p4d_dir = p4d_offset(pgd_dir, virtaddr);
	pud_dir = pud_offset(p4d_dir, virtaddr);
	pmd_dir = pmd_alloc(&init_mm, pud_dir, virtaddr);
	if (!pmd_dir) {
	printk("ioremap: no mem for pmd_dir\n");
	return NULL;
	}

	#if CONFIG_PGTABLE_LEVELS == 3
	if (CPU_IS_020_OR_030) {
	pmd_val(*pmd_dir) = physaddr;
	physaddr += PMD_SIZE;
	virtaddr += PMD_SIZE;
	size -= PMD_SIZE;
	} else
	#endif
	{
	pte_dir = pte_alloc_kernel(pmd_dir, virtaddr);
	if (!pte_dir) {
	printk("ioremap: no mem for pte_dir\n");
	return NULL;
	}

	pte_val(*pte_dir) = physaddr;
	virtaddr += PAGE_SIZE;
	physaddr += PAGE_SIZE;
	size -= PAGE_SIZE;
	}
	}
	#ifdef DEBUG
	printk("\n");
	#endif
	flush_tlb_all();

	return (void __iomem *)retaddr;
	}
	EXPORT_SYMBOL(__ioremap);

	/*
	* Unmap an ioremap()ed region again
	*/
	void iounmap(void __iomem *addr)
	{
	#ifdef CONFIG_AMIGA
	if (MACH_IS_AMIGA &&
	((unsigned long)addr >= 0x40000000) &&
	((unsigned long)addr < 0x60000000))
	return;
	#endif
	#ifdef CONFIG_VIRT
	if (MACH_IS_VIRT && (unsigned long)addr >= 0xff000000)
	return;
	#endif
	#ifdef CONFIG_COLDFIRE
	if (cf_internalio(addr))
	return;
	#endif
	free_io_area((__force void *)addr);
	}
	EXPORT_SYMBOL(iounmap);

	/*
	* Set new cache mode for some kernel address space.
	* The caller must push data for that range itself, if such data may already
	* be in the cache.
	*/
	void kernel_set_cachemode(void *addr, unsigned long size, int cmode)
	{
	unsigned long virtaddr = (unsigned long)addr;
	pgd_t *pgd_dir;
	p4d_t *p4d_dir;
	pud_t *pud_dir;
	pmd_t *pmd_dir;
	pte_t *pte_dir;

	if (CPU_IS_040_OR_060) {
	switch (cmode) {
	case IOMAP_FULL_CACHING:
	cmode = _PAGE_CACHE040;
	break;
	case IOMAP_NOCACHE_SER:
	default:
	cmode = _PAGE_NOCACHE_S;
	break;
	case IOMAP_NOCACHE_NONSER:
	cmode = _PAGE_NOCACHE;
	break;
	case IOMAP_WRITETHROUGH:
	cmode = _PAGE_CACHE040W;
	break;
	}
	} else {
	switch (cmode) {
	case IOMAP_NOCACHE_SER:
	case IOMAP_NOCACHE_NONSER:
	default:
	cmode = _PAGE_NOCACHE030;
	break;
	case IOMAP_FULL_CACHING:
	case IOMAP_WRITETHROUGH:
	cmode = 0;
	}
	}

	while ((long)size > 0) {
	pgd_dir = pgd_offset_k(virtaddr);
	p4d_dir = p4d_offset(pgd_dir, virtaddr);
	pud_dir = pud_offset(p4d_dir, virtaddr);
	if (pud_bad(*pud_dir)) {
	printk("iocachemode: bad pud(%08lx)\n", pud_val(*pud_dir));
	pud_clear(pud_dir);
	return;
	}
	pmd_dir = pmd_offset(pud_dir, virtaddr);

	#if CONFIG_PGTABLE_LEVELS == 3
	if (CPU_IS_020_OR_030) {
	unsigned long pmd = pmd_val(*pmd_dir);

	if ((pmd & _DESCTYPE_MASK) == _PAGE_PRESENT) {
	*pmd_dir = __pmd((pmd & _CACHEMASK040) \| cmode);
	virtaddr += PMD_SIZE;
	size -= PMD_SIZE;
	continue;
	}
	}
	#endif

	if (pmd_bad(*pmd_dir)) {
	printk("iocachemode: bad pmd (%08lx)\n", pmd_val(*pmd_dir));
	pmd_clear(pmd_dir);
	return;
	}
	pte_dir = pte_offset_kernel(pmd_dir, virtaddr);

	pte_val(pte_dir) = (pte_val(pte_dir) & _CACHEMASK040) \| cmode;
	virtaddr += PAGE_SIZE;
	size -= PAGE_SIZE;
	}

	flush_tlb_all();
	}
	EXPORT_SYMBOL(kernel_set_cachemode);