[PATCH] xtensa: Architecture support for Tensilica Xtensa Part 5

The attached patches provides part 5 of an architecture implementation for the
Tensilica Xtensa CPU series.
Signed-off-by: Chris Zankel <chris@zankel.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/xtensa/mm/Makefile

+#
+# Makefile for the Linux/Xtensa-specific parts of the memory manager.
+#
+# Note! Dependencies are done automagically by 'make dep', which also
+# removes any old dependencies. DON'T put your own dependencies here
+# unless it's something special (ie not a .c file).
+#
+# Note 2! The CFLAGS definition is now in the main makefile...
+
+obj-y	 := init.o fault.o tlb.o misc.o
+obj-m	 :=
+obj-n	 :=
+obj-	 :=

arch/xtensa/mm/fault.c

+// TODO VM_EXEC flag work-around, cache aliasing
+/*
+ * arch/xtensa/mm/fault.c
+ *
+ * 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.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ *
+ * Chris Zankel <chris@zankel.net>
+ * Joe Taylor	<joe@tensilica.com, joetylr@yahoo.com>
+ */
+
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <asm/mmu_context.h>
+#include <asm/cacheflush.h>
+#include <asm/hardirq.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/pgalloc.h>
+
+unsigned long asid_cache = ASID_FIRST_VERSION;
+void bad_page_fault(struct pt_regs*, unsigned long, int);
+
+/*
+ * This routine handles page faults.  It determines the address,
+ * and the problem, and then passes it off to one of the appropriate
+ * routines.
+ *
+ * Note: does not handle Miss and MultiHit.
+ */
+
+void do_page_fault(struct pt_regs *regs)
+{
+	struct vm_area_struct * vma;
+	struct mm_struct *mm = current->mm;
+	unsigned int exccause = regs->exccause;
+	unsigned int address = regs->excvaddr;
+	siginfo_t info;
+
+	int is_write, is_exec;
+
+	info.si_code = SEGV_MAPERR;
+
+	/* We fault-in kernel-space virtual memory on-demand. The
+	 * 'reference' page table is init_mm.pgd.
+	 */
+	if (address >= TASK_SIZE && !user_mode(regs))
+		goto vmalloc_fault;
+
+	/* If we're in an interrupt or have no user
+	 * context, we must not take the fault..
+	 */
+	if (in_atomic() || !mm) {
+		bad_page_fault(regs, address, SIGSEGV);
+		return;
+	}
+
+	is_write = (exccause == XCHAL_EXCCAUSE_STORE_CACHE_ATTRIBUTE) ? 1 : 0;
+	is_exec =  (exccause == XCHAL_EXCCAUSE_ITLB_PRIVILEGE ||
+		    exccause == XCHAL_EXCCAUSE_ITLB_MISS ||
+		    exccause == XCHAL_EXCCAUSE_FETCH_CACHE_ATTRIBUTE) ? 1 : 0;
+
+#if 0
+	printk("[%s:%d:%08x:%d:%08x:%s%s]\n", current->comm, current->pid,
+	       address, exccause, regs->pc, is_write? "w":"", is_exec? "x":"");
+#endif
+
+	down_read(&mm->mmap_sem);
+	vma = find_vma(mm, address);
+
+	if (!vma)
+		goto bad_area;
+	if (vma->vm_start <= address)
+		goto good_area;
+	if (!(vma->vm_flags & VM_GROWSDOWN))
+		goto bad_area;
+	if (expand_stack(vma, address))
+		goto bad_area;
+
+	/* Ok, we have a good vm_area for this memory access, so
+	 * we can handle it..
+	 */
+
+good_area:
+	info.si_code = SEGV_ACCERR;
+
+	if (is_write) {
+		if (!(vma->vm_flags & VM_WRITE))
+			goto bad_area;
+	} else if (is_exec) {
+		if (!(vma->vm_flags & VM_EXEC))
+			goto bad_area;
+	} else	/* Allow read even from write-only pages. */
+		if (!(vma->vm_flags & (VM_READ | VM_WRITE)))
+			goto bad_area;
+
+	/* If for any reason at all we couldn't handle the fault,
+	 * make sure we exit gracefully rather than endlessly redo
+	 * the fault.
+	 */
+survive:
+	switch (handle_mm_fault(mm, vma, address, is_write)) {
+	case VM_FAULT_MINOR:
+		current->min_flt++;
+		break;
+	case VM_FAULT_MAJOR:
+		current->maj_flt++;
+		break;
+	case VM_FAULT_SIGBUS:
+		goto do_sigbus;
+	case VM_FAULT_OOM:
+		goto out_of_memory;
+	default:
+		BUG();
+	}
+
+	up_read(&mm->mmap_sem);
+	return;
+
+	/* Something tried to access memory that isn't in our memory map..
+	 * Fix it, but check if it's kernel or user first..
+	 */
+bad_area:
+	up_read(&mm->mmap_sem);
+	if (user_mode(regs)) {
+		current->thread.bad_vaddr = address;
+		current->thread.error_code = is_write;
+		info.si_signo = SIGSEGV;
+		info.si_errno = 0;
+		/* info.si_code has been set above */
+		info.si_addr = (void *) address;
+		force_sig_info(SIGSEGV, &info, current);
+		return;
+	}
+	bad_page_fault(regs, address, SIGSEGV);
+	return;
+
+
+	/* We ran out of memory, or some other thing happened to us that made
+	 * us unable to handle the page fault gracefully.
+	 */
+out_of_memory:
+	up_read(&mm->mmap_sem);
+	if (current->pid == 1) {
+		yield();
+		down_read(&mm->mmap_sem);
+		goto survive;
+	}
+	printk("VM: killing process %s\n", current->comm);
+	if (user_mode(regs))
+		do_exit(SIGKILL);
+	bad_page_fault(regs, address, SIGKILL);
+	return;
+
+do_sigbus:
+	up_read(&mm->mmap_sem);
+
+	/* Send a sigbus, regardless of whether we were in kernel
+	 * or user mode.
+	 */
+	current->thread.bad_vaddr = address;
+	info.si_code = SIGBUS;
+	info.si_errno = 0;
+	info.si_code = BUS_ADRERR;
+	info.si_addr = (void *) address;
+	force_sig_info(SIGBUS, &info, current);
+
+	/* Kernel mode? Handle exceptions or die */
+	if (!user_mode(regs))
+		bad_page_fault(regs, address, SIGBUS);
+
+vmalloc_fault:
+	{
+		/* Synchronize this task's top level page-table
+		 * with the 'reference' page table.
+		 */
+		struct mm_struct *act_mm = current->active_mm;
+		int index = pgd_index(address);
+		pgd_t *pgd, *pgd_k;
+		pmd_t *pmd, *pmd_k;
+		pte_t *pte_k;
+
+		if (act_mm == NULL)
+			goto bad_page_fault;
+
+		pgd = act_mm->pgd + index;
+		pgd_k = init_mm.pgd + index;
+
+		if (!pgd_present(*pgd_k))
+			goto bad_page_fault;
+
+		pgd_val(*pgd) = pgd_val(*pgd_k);
+
+		pmd = pmd_offset(pgd, address);
+		pmd_k = pmd_offset(pgd_k, address);
+		if (!pmd_present(*pmd) || !pmd_present(*pmd_k))
+			goto bad_page_fault;
+
+		pmd_val(*pmd) = pmd_val(*pmd_k);
+		pte_k = pte_offset_kernel(pmd_k, address);
+
+		if (!pte_present(*pte_k))
+			goto bad_page_fault;
+		return;
+	}
+bad_page_fault:
+	bad_page_fault(regs, address, SIGKILL);
+	return;
+}
+
+
+void
+bad_page_fault(struct pt_regs *regs, unsigned long address, int sig)
+{
+	extern void die(const char*, struct pt_regs*, long);
+	const struct exception_table_entry *entry;
+
+	/* Are we prepared to handle this kernel fault?  */
+	if ((entry = search_exception_tables(regs->pc)) != NULL) {
+#if 1
+		printk(KERN_DEBUG "%s: Exception at pc=%#010lx (%lx)\n",
+				current->comm, regs->pc, entry->fixup);
+#endif
+		current->thread.bad_uaddr = address;
+		regs->pc = entry->fixup;
+		return;
+	}
+
+	/* Oops. The kernel tried to access some bad page. We'll have to
+	 * terminate things with extreme prejudice.
+	 */
+	printk(KERN_ALERT "Unable to handle kernel paging request at virtual "
+	       "address %08lx\n pc = %08lx, ra = %08lx\n",
+	       address, regs->pc, regs->areg[0]);
+	die("Oops", regs, sig);
+	do_exit(sig);
+}
+

arch/xtensa/mm/init.c

+/*
+ * arch/xtensa/mm/init.c
+ *
+ * Derived from MIPS, PPC.
+ *
+ * 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.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ *
+ * Chris Zankel	<chris@zankel.net>
+ * Joe Taylor	<joe@tensilica.com, joetylr@yahoo.com>
+ * Marc Gauthier
+ * Kevin Chea
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/bootmem.h>
+#include <linux/swap.h>
+
+#include <asm/pgtable.h>
+#include <asm/bootparam.h>
+#include <asm/mmu_context.h>
+#include <asm/tlb.h>
+#include <asm/tlbflush.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+
+
+#define DEBUG 0
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+//static DEFINE_SPINLOCK(tlb_lock);
+
+/*
+ * This flag is used to indicate that the page was mapped and modified in
+ * kernel space, so the cache is probably dirty at that address.
+ * If cache aliasing is enabled and the page color mismatches, update_mmu_cache
+ * synchronizes the caches if this bit is set.
+ */
+
+#define PG_cache_clean PG_arch_1
+
+/* References to section boundaries */
+
+extern char _ftext, _etext, _fdata, _edata, _rodata_end;
+extern char __init_begin, __init_end;
+
+/*
+ * mem_reserve(start, end, must_exist)
+ *
+ * Reserve some memory from the memory pool.
+ *
+ * Parameters:
+ *  start	Start of region,
+ *  end		End of region,
+ *  must_exist	Must exist in memory pool.
+ *
+ * Returns:
+ *  0 (memory area couldn't be mapped)
+ * -1 (success)
+ */
+
+int __init mem_reserve(unsigned long start, unsigned long end, int must_exist)
+{
+	int i;
+
+	if (start == end)
+		return 0;
+
+	start = start & PAGE_MASK;
+	end = PAGE_ALIGN(end);
+
+	for (i = 0; i < sysmem.nr_banks; i++)
+		if (start < sysmem.bank[i].end
+		    && end >= sysmem.bank[i].start)
+			break;
+
+	if (i == sysmem.nr_banks) {
+		if (must_exist)
+			printk (KERN_WARNING "mem_reserve: [0x%0lx, 0x%0lx) "
+				"not in any region!\n", start, end);
+		return 0;
+	}
+
+	if (start > sysmem.bank[i].start) {
+		if (end < sysmem.bank[i].end) {
+			/* split entry */
+			if (sysmem.nr_banks >= SYSMEM_BANKS_MAX)
+				panic("meminfo overflow\n");
+			sysmem.bank[sysmem.nr_banks].start = end;
+			sysmem.bank[sysmem.nr_banks].end = sysmem.bank[i].end;
+			sysmem.nr_banks++;
+		}
+		sysmem.bank[i].end = start;
+	} else {
+		if (end < sysmem.bank[i].end)
+			sysmem.bank[i].start = end;
+		else {
+			/* remove entry */
+			sysmem.nr_banks--;
+			sysmem.bank[i].start = sysmem.bank[sysmem.nr_banks].start;
+			sysmem.bank[i].end   = sysmem.bank[sysmem.nr_banks].end;
+		}
+	}
+	return -1;
+}
+
+
+/*
+ * Initialize the bootmem system and give it all the memory we have available.
+ */
+
+void __init bootmem_init(void)
+{
+	unsigned long pfn;
+	unsigned long bootmap_start, bootmap_size;
+	int i;
+
+	max_low_pfn = max_pfn = 0;
+	min_low_pfn = ~0;
+
+	for (i=0; i < sysmem.nr_banks; i++) {
+		pfn = PAGE_ALIGN(sysmem.bank[i].start) >> PAGE_SHIFT;
+		if (pfn < min_low_pfn)
+			min_low_pfn = pfn;
+		pfn = PAGE_ALIGN(sysmem.bank[i].end - 1) >> PAGE_SHIFT;
+		if (pfn > max_pfn)
+			max_pfn = pfn;
+	}
+
+	if (min_low_pfn > max_pfn)
+		panic("No memory found!\n");
+
+	max_low_pfn = max_pfn < MAX_LOW_MEMORY >> PAGE_SHIFT ?
+		max_pfn : MAX_LOW_MEMORY >> PAGE_SHIFT;
+
+	/* Find an area to use for the bootmem bitmap. */
+
+	bootmap_size = bootmem_bootmap_pages(max_low_pfn) << PAGE_SHIFT;
+	bootmap_start = ~0;
+
+	for (i=0; i<sysmem.nr_banks; i++)
+		if (sysmem.bank[i].end - sysmem.bank[i].start >= bootmap_size) {
+			bootmap_start = sysmem.bank[i].start;
+			break;
+		}
+
+	if (bootmap_start == ~0UL)
+		panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
+
+	/* Reserve the bootmem bitmap area */
+
+	mem_reserve(bootmap_start, bootmap_start + bootmap_size, 1);
+	bootmap_size = init_bootmem_node(NODE_DATA(0), min_low_pfn,
+					 bootmap_start >> PAGE_SHIFT,
+					 max_low_pfn);
+
+	/* Add all remaining memory pieces into the bootmem map */
+
+	for (i=0; i<sysmem.nr_banks; i++)
+		free_bootmem(sysmem.bank[i].start,
+			     sysmem.bank[i].end - sysmem.bank[i].start);
+
+}
+
+
+void __init paging_init(void)
+{
+	unsigned long zones_size[MAX_NR_ZONES];
+	int i;
+
+	/* All pages are DMA-able, so we put them all in the DMA zone. */
+
+	zones_size[ZONE_DMA] = max_low_pfn;
+	for (i = 1; i < MAX_NR_ZONES; i++)
+		zones_size[i] = 0;
+
+#ifdef CONFIG_HIGHMEM
+	zones_size[ZONE_HIGHMEM] = max_pfn - max_low_pfn;
+#endif
+
+	/* Initialize the kernel's page tables. */
+
+	memset(swapper_pg_dir, 0, PAGE_SIZE);
+
+	free_area_init(zones_size);
+}
+
+/*
+ * Flush the mmu and reset associated register to default values.
+ */
+
+void __init init_mmu (void)
+{
+	/* Writing zeros to the <t>TLBCFG special registers ensure
+	 * that valid values exist in the register.  For existing
+	 * PGSZID<w> fields, zero selects the first element of the
+	 * page-size array.  For nonexistant PGSZID<w> fields, zero is
+	 * the best value to write.  Also, when changing PGSZID<w>
+	 * fields, the corresponding TLB must be flushed.
+	 */
+	set_itlbcfg_register (0);
+	set_dtlbcfg_register (0);
+	flush_tlb_all ();
+
+	/* Set rasid register to a known value. */
+
+	set_rasid_register (ASID_ALL_RESERVED);
+
+	/* Set PTEVADDR special register to the start of the page
+	 * table, which is in kernel mappable space (ie. not
+	 * statically mapped).  This register's value is undefined on
+	 * reset.
+	 */
+	set_ptevaddr_register (PGTABLE_START);
+}
+
+/*
+ * Initialize memory pages.
+ */
+
+void __init mem_init(void)
+{
+	unsigned long codesize, reservedpages, datasize, initsize;
+	unsigned long highmemsize, tmp, ram;
+
+	max_mapnr = num_physpages = max_low_pfn;
+	high_memory = (void *) __va(max_mapnr << PAGE_SHIFT);
+	highmemsize = 0;
+
+#if CONFIG_HIGHMEM
+#error HIGHGMEM not implemented in init.c
+#endif
+
+	totalram_pages += free_all_bootmem();
+
+	reservedpages = ram = 0;
+	for (tmp = 0; tmp < max_low_pfn; tmp++) {
+		ram++;
+		if (PageReserved(mem_map+tmp))
+			reservedpages++;
+	}
+
+	codesize =  (unsigned long) &_etext - (unsigned long) &_ftext;
+	datasize =  (unsigned long) &_edata - (unsigned long) &_fdata;
+	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
+
+	printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, "
+	       "%ldk data, %ldk init %ldk highmem)\n",
+	       (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
+	       ram << (PAGE_SHIFT-10),
+	       codesize >> 10,
+	       reservedpages << (PAGE_SHIFT-10),
+	       datasize >> 10,
+	       initsize >> 10,
+	       highmemsize >> 10);
+}
+
+void
+free_reserved_mem(void *start, void *end)
+{
+	for (; start < end; start += PAGE_SIZE) {
+		ClearPageReserved(virt_to_page(start));
+		set_page_count(virt_to_page(start), 1);
+		free_page((unsigned long)start);
+		totalram_pages++;
+	}
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+extern int initrd_is_mapped;
+
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+	if (initrd_is_mapped) {
+		free_reserved_mem((void*)start, (void*)end);
+		printk ("Freeing initrd memory: %ldk freed\n",(end-start)>>10);
+	}
+}
+#endif
+
+void free_initmem(void)
+{
+	free_reserved_mem(&__init_begin, &__init_end);
+	printk("Freeing unused kernel memory: %dk freed\n",
+	       (&__init_end - &__init_begin) >> 10);
+}
+
+void show_mem(void)
+{
+	int i, free = 0, total = 0, reserved = 0;
+	int shared = 0, cached = 0;
+
+	printk("Mem-info:\n");
+	show_free_areas();
+	printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
+	i = max_mapnr;
+	while (i-- > 0) {
+		total++;
+		if (PageReserved(mem_map+i))
+			reserved++;
+		else if (PageSwapCache(mem_map+i))
+			cached++;
+		else if (!page_count(mem_map + i))
+			free++;
+		else
+			shared += page_count(mem_map + i) - 1;
+	}
+	printk("%d pages of RAM\n", total);
+	printk("%d reserved pages\n", reserved);
+	printk("%d pages shared\n", shared);
+	printk("%d pages swap cached\n",cached);
+	printk("%d free pages\n", free);
+}
+
+/* ------------------------------------------------------------------------- */
+
+#if (DCACHE_WAY_SIZE > PAGE_SIZE)
+
+/*
+ * With cache aliasing, the page color of the page in kernel space and user
+ * space might mismatch. We temporarily map the page to a different virtual
+ * address with the same color and clear the page there.
+ */
+
+void clear_user_page(void *kaddr, unsigned long vaddr, struct page* page)
+{
+
+  	/*  There shouldn't be any entries for this page. */
+
+	__flush_invalidate_dcache_page_phys(__pa(page_address(page)));
+
+	if (!PAGE_COLOR_EQ(vaddr, kaddr)) {
+		unsigned long v, p;
+
+		/* Temporarily map page to DTLB_WAY_DCACHE_ALIAS0. */
+
+		spin_lock(&tlb_lock);
+
+		p = (unsigned long)pte_val((mk_pte(page,PAGE_KERNEL)));
+		kaddr = (void*)PAGE_COLOR_MAP0(vaddr);
+		v = (unsigned long)kaddr | DTLB_WAY_DCACHE_ALIAS0;
+		__asm__ __volatile__("wdtlb %0,%1; dsync" : :"a" (p), "a" (v));
+
+		clear_page(kaddr);
+
+		spin_unlock(&tlb_lock);
+	} else {
+		clear_page(kaddr);
+	}
+
+	/* We need to make sure that i$ and d$ are coherent. */
+
+	clear_bit(PG_cache_clean, &page->flags);
+}
+
+/*
+ * With cache aliasing, we have to make sure that the page color of the page
+ * in kernel space matches that of the virtual user address before we read
+ * the page. If the page color differ, we create a temporary DTLB entry with
+ * the corrent page color and use this 'temporary' address as the source.
+ * We then use the same approach as in clear_user_page and copy the data
+ * to the kernel space and clear the PG_cache_clean bit to synchronize caches
+ * later.
+ *
+ * Note:
+ * Instead of using another 'way' for the temporary DTLB entry, we could
+ * probably use the same entry that points to the kernel address (after
+ * saving the original value and restoring it when we are done).
+ */
+
+void copy_user_page(void* to, void* from, unsigned long vaddr,
+    		    struct page* to_page)
+{
+	/* There shouldn't be any entries for the new page. */
+
+	__flush_invalidate_dcache_page_phys(__pa(page_address(to_page)));
+
+	spin_lock(&tlb_lock);
+
+	if (!PAGE_COLOR_EQ(vaddr, from)) {
+		unsigned long v, p, t;
+
+		__asm__ __volatile__ ("pdtlb %1,%2; rdtlb1 %0,%1"
+				      : "=a"(p), "=a"(t) : "a"(from));
+		from = (void*)PAGE_COLOR_MAP0(vaddr);
+		v = (unsigned long)from | DTLB_WAY_DCACHE_ALIAS0;
+		__asm__ __volatile__ ("wdtlb %0,%1; dsync" ::"a" (p), "a" (v));
+	}
+
+	if (!PAGE_COLOR_EQ(vaddr, to)) {
+		unsigned long v, p;
+
+		p = (unsigned long)pte_val((mk_pte(to_page,PAGE_KERNEL)));
+		to = (void*)PAGE_COLOR_MAP1(vaddr);
+		v = (unsigned long)to | DTLB_WAY_DCACHE_ALIAS1;
+		__asm__ __volatile__ ("wdtlb %0,%1; dsync" ::"a" (p), "a" (v));
+	}
+	copy_page(to, from);
+
+	spin_unlock(&tlb_lock);
+
+	/* We need to make sure that i$ and d$ are coherent. */
+
+	clear_bit(PG_cache_clean, &to_page->flags);
+}
+
+
+
+/*
+ * Any time the kernel writes to a user page cache page, or it is about to
+ * read from a page cache page this routine is called.
+ *
+ * Note:
+ * The kernel currently only provides one architecture bit in the page
+ * flags that we use for I$/D$ coherency. Maybe, in future, we can
+ * use a sepearte bit for deferred dcache aliasing:
+ * If the page is not mapped yet, we only need to set a flag,
+ * if mapped, we need to invalidate the page.
+ */
+// FIXME: we probably need this for WB caches not only for Page Coloring..
+
+void flush_dcache_page(struct page *page)
+{
+	unsigned long addr = __pa(page_address(page));
+	struct address_space *mapping = page_mapping(page);
+
+	__flush_invalidate_dcache_page_phys(addr);
+
+	if (!test_bit(PG_cache_clean, &page->flags))
+		return;
+
+	/* If this page hasn't been mapped, yet, handle I$/D$ coherency later.*/
+#if 0
+	if (mapping && !mapping_mapped(mapping))
+		clear_bit(PG_cache_clean, &page->flags);
+	else
+#endif
+		__invalidate_icache_page_phys(addr);
+}
+
+void flush_cache_range(struct vm_area_struct* vma, unsigned long s,
+		       unsigned long e)
+{
+	__flush_invalidate_cache_all();
+}
+
+void flush_cache_page(struct vm_area_struct* vma, unsigned long address,
+    		      unsigned long pfn)
+{
+	struct page *page = pfn_to_page(pfn);
+
+	/* Remove any entry for the old mapping. */
+
+	if (current->active_mm == vma->vm_mm) {
+		unsigned long addr = __pa(page_address(page));
+		__flush_invalidate_dcache_page_phys(addr);
+		if ((vma->vm_flags & VM_EXEC) != 0)
+			__invalidate_icache_page_phys(addr);
+	} else {
+		BUG();
+	}
+}
+
+#endif	/* (DCACHE_WAY_SIZE > PAGE_SIZE) */
+
+
+pte_t* pte_alloc_one_kernel (struct mm_struct* mm, unsigned long addr)
+{
+	pte_t* pte = (pte_t*)__get_free_pages(GFP_KERNEL|__GFP_REPEAT, 0);
+	if (likely(pte)) {
+	       	pte_t* ptep = (pte_t*)(pte_val(*pte) + PAGE_OFFSET);
+		int i;
+		for (i = 0; i < 1024; i++, ptep++)
+			pte_clear(mm, addr, ptep);
+	}
+	return pte;
+}
+
+struct page* pte_alloc_one(struct mm_struct *mm, unsigned long addr)
+{
+	struct page *page;
+
+	page = alloc_pages(GFP_KERNEL | __GFP_REPEAT, 0);
+
+	if (likely(page)) {
+		pte_t* ptep = kmap_atomic(page, KM_USER0);
+		int i;
+
+		for (i = 0; i < 1024; i++, ptep++)
+			pte_clear(mm, addr, ptep);
+
+		kunmap_atomic(ptep, KM_USER0);
+	}
+	return page;
+}
+
+
+/*
+ * Handle D$/I$ coherency.
+ *
+ * Note:
+ * We only have one architecture bit for the page flags, so we cannot handle
+ * cache aliasing, yet.
+ */
+
+void
+update_mmu_cache(struct vm_area_struct * vma, unsigned long addr, pte_t pte)
+{
+	unsigned long pfn = pte_pfn(pte);
+	struct page *page;
+	unsigned long vaddr = addr & PAGE_MASK;
+
+	if (!pfn_valid(pfn))
+		return;
+
+	page = pfn_to_page(pfn);
+
+	invalidate_itlb_mapping(addr);
+	invalidate_dtlb_mapping(addr);
+
+	/* We have a new mapping. Use it. */
+
+	write_dtlb_entry(pte, dtlb_probe(addr));
+
+	/* If the processor can execute from this page, synchronize D$/I$. */
+
+	if ((vma->vm_flags & VM_EXEC) != 0) {
+
+		write_itlb_entry(pte, itlb_probe(addr));
+
+		/* Synchronize caches, if not clean. */
+
+		if (!test_and_set_bit(PG_cache_clean, &page->flags)) {
+			__flush_dcache_page(vaddr);
+			__invalidate_icache_page(vaddr);
+		}
+	}
+}
+

arch/xtensa/mm/misc.S

+/*
+ * arch/xtensa/mm/misc.S
+ *
+ * Miscellaneous assembly functions.
+ *
+ * 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.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ *
+ * Chris Zankel	<chris@zankel.net>
+ */
+
+/* Note: we might want to implement some of the loops as zero-overhead-loops,
+ *	 where applicable and if supported by the processor.
+ */
+
+#include <linux/linkage.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+
+#include <xtensa/cacheasm.h>
+#include <xtensa/cacheattrasm.h>
+
+/* clear_page (page) */
+
+ENTRY(clear_page)
+	entry	a1, 16
+	addi	a4, a2, PAGE_SIZE
+	movi	a3, 0
+
+1:	s32i	a3, a2, 0
+	s32i	a3, a2, 4
+	s32i	a3, a2, 8
+	s32i	a3, a2, 12
+	s32i	a3, a2, 16
+	s32i	a3, a2, 20
+	s32i	a3, a2, 24
+	s32i	a3, a2, 28
+	addi	a2, a2, 32
+	blt	a2, a4, 1b
+
+	retw
+
+/*
+ * copy_page (void *to, void *from)
+ *                  a2        a3
+ */
+
+ENTRY(copy_page)
+	entry	a1, 16
+	addi	a4, a2, PAGE_SIZE
+
+1:	l32i	a5, a3, 0
+	l32i	a6, a3, 4
+	l32i	a7, a3, 8
+	s32i	a5, a2, 0
+	s32i	a6, a2, 4
+	s32i	a7, a2, 8
+	l32i	a5, a3, 12
+	l32i	a6, a3, 16
+	l32i	a7, a3, 20
+	s32i	a5, a2, 12
+	s32i	a6, a2, 16
+	s32i	a7, a2, 20
+	l32i	a5, a3, 24
+	l32i	a6, a3, 28
+	s32i	a5, a2, 24
+	s32i	a6, a2, 28
+	addi	a2, a2, 32
+	addi	a3, a3, 32
+	blt	a2, a4, 1b
+
+	retw
+
+
+/*
+ * void __flush_invalidate_cache_all(void)
+ */
+
+ENTRY(__flush_invalidate_cache_all)
+	entry	sp, 16
+	dcache_writeback_inv_all a2, a3
+	icache_invalidate_all a2, a3
+	retw
+
+/*
+ * void __invalidate_icache_all(void)
+ */
+
+ENTRY(__invalidate_icache_all)
+	entry	sp, 16
+	icache_invalidate_all a2, a3
+	retw
+
+/*
+ * void __flush_invalidate_dcache_all(void)
+ */
+
+ENTRY(__flush_invalidate_dcache_all)
+	entry	sp, 16
+	dcache_writeback_inv_all a2, a3
+	retw
+
+
+/*
+ * void __flush_invalidate_cache_range(ulong start, ulong size)
+ */
+
+ENTRY(__flush_invalidate_cache_range)
+	entry	sp, 16
+	mov	a4, a2
+	mov	a5, a3
+	dcache_writeback_inv_region a4, a5, a6
+	icache_invalidate_region a2, a3, a4
+	retw
+
+/*
+ * void __invalidate_icache_page(ulong start)
+ */
+
+ENTRY(__invalidate_icache_page)
+	entry	sp, 16
+	movi	a3, PAGE_SIZE
+	icache_invalidate_region a2, a3, a4
+	retw
+
+/*
+ * void __invalidate_dcache_page(ulong start)
+ */
+
+ENTRY(__invalidate_dcache_page)
+	entry	sp, 16
+	movi	a3, PAGE_SIZE
+	dcache_invalidate_region a2, a3, a4
+	retw
+
+/*
+ * void __invalidate_icache_range(ulong start, ulong size)
+ */
+
+ENTRY(__invalidate_icache_range)
+	entry	sp, 16
+	icache_invalidate_region a2, a3, a4
+	retw
+
+/*
+ * void __invalidate_dcache_range(ulong start, ulong size)
+ */
+
+ENTRY(__invalidate_dcache_range)
+	entry	sp, 16
+	dcache_invalidate_region a2, a3, a4
+	retw
+
+/*
+ * void __flush_dcache_page(ulong start)
+ */
+
+ENTRY(__flush_dcache_page)
+	entry	sp, 16
+	movi	a3, PAGE_SIZE
+	dcache_writeback_region a2, a3, a4
+	retw
+
+/*
+ * void __flush_invalidate_dcache_page(ulong start)
+ */
+
+ENTRY(__flush_invalidate_dcache_page)
+	entry	sp, 16
+	movi	a3, PAGE_SIZE
+	dcache_writeback_inv_region a2, a3, a4
+	retw
+
+/*
+ * void __flush_invalidate_dcache_range(ulong start, ulong size)
+ */
+
+ENTRY(__flush_invalidate_dcache_range)
+	entry	sp, 16
+	dcache_writeback_inv_region a2, a3, a4
+	retw
+
+/*
+ * void __invalidate_dcache_all(void)
+ */
+
+ENTRY(__invalidate_dcache_all)
+	entry	sp, 16
+	dcache_invalidate_all a2, a3
+	retw
+
+/*
+ * void __flush_invalidate_dcache_page_phys(ulong start)
+ */
+
+ENTRY(__flush_invalidate_dcache_page_phys)
+	entry	sp, 16
+
+	movi	a3, XCHAL_DCACHE_SIZE
+	movi	a4, PAGE_MASK | 1
+	addi	a2, a2, 1
+
+1:	addi	a3, a3, -XCHAL_DCACHE_LINESIZE
+
+	ldct	a6, a3
+	dsync
+	and	a6, a6, a4
+	beq	a6, a2, 2f
+	bgeui	a3, 2, 1b
+	retw
+
+2:	diwbi	a3, 0
+	bgeui	a3, 2, 1b
+	retw
+
+ENTRY(check_dcache_low0)
+	entry	sp, 16
+
+	movi	a3, XCHAL_DCACHE_SIZE / 4
+	movi	a4, PAGE_MASK | 1
+	addi	a2, a2, 1
+
+1:	addi	a3, a3, -XCHAL_DCACHE_LINESIZE
+
+	ldct	a6, a3
+	dsync
+	and	a6, a6, a4
+	beq	a6, a2, 2f
+	bgeui	a3, 2, 1b
+	retw
+
+2:	j 2b
+
+ENTRY(check_dcache_high0)
+	entry	sp, 16
+
+	movi	a5, XCHAL_DCACHE_SIZE / 4
+	movi	a3, XCHAL_DCACHE_SIZE / 2
+	movi	a4, PAGE_MASK | 1
+	addi	a2, a2, 1
+
+1:	addi	a3, a3, -XCHAL_DCACHE_LINESIZE
+	addi	a5, a5, -XCHAL_DCACHE_LINESIZE
+
+	ldct	a6, a3
+	dsync
+	and	a6, a6, a4
+	beq	a6, a2, 2f
+	bgeui	a5, 2, 1b
+	retw
+
+2:	j 2b
+
+ENTRY(check_dcache_low1)
+	entry	sp, 16
+
+	movi	a5, XCHAL_DCACHE_SIZE / 4
+	movi	a3, XCHAL_DCACHE_SIZE * 3 / 4
+	movi	a4, PAGE_MASK | 1
+	addi	a2, a2, 1
+
+1:	addi	a3, a3, -XCHAL_DCACHE_LINESIZE
+	addi	a5, a5, -XCHAL_DCACHE_LINESIZE
+
+	ldct	a6, a3
+	dsync
+	and	a6, a6, a4
+	beq	a6, a2, 2f
+	bgeui	a5, 2, 1b
+	retw
+
+2:	j 2b
+
+ENTRY(check_dcache_high1)
+	entry	sp, 16
+
+	movi	a5, XCHAL_DCACHE_SIZE / 4
+	movi	a3, XCHAL_DCACHE_SIZE
+	movi	a4, PAGE_MASK | 1
+	addi	a2, a2, 1
+
+1:	addi	a3, a3, -XCHAL_DCACHE_LINESIZE
+	addi	a5, a5, -XCHAL_DCACHE_LINESIZE
+
+	ldct	a6, a3
+	dsync
+	and	a6, a6, a4
+	beq	a6, a2, 2f
+	bgeui	a5, 2, 1b
+	retw
+
+2:	j 2b
+
+
+/*
+ * void __invalidate_icache_page_phys(ulong start)
+ */
+
+ENTRY(__invalidate_icache_page_phys)
+	entry	sp, 16
+
+	movi	a3, XCHAL_ICACHE_SIZE
+	movi	a4, PAGE_MASK | 1
+	addi	a2, a2, 1
+
+1:	addi	a3, a3, -XCHAL_ICACHE_LINESIZE
+
+	lict	a6, a3
+	isync
+	and	a6, a6, a4
+	beq	a6, a2, 2f
+	bgeui	a3, 2, 1b
+	retw
+
+2:	iii	a3, 0
+	bgeui	a3, 2, 1b
+	retw
+
+
+#if 0
+
+	movi	a3, XCHAL_DCACHE_WAYS - 1
+	movi	a4, PAGE_SIZE
+
+1:	mov	a5, a2
+	add	a6, a2, a4
+
+2:	diwbi	a5, 0
+	diwbi	a5, XCHAL_DCACHE_LINESIZE
+	diwbi	a5, XCHAL_DCACHE_LINESIZE * 2
+	diwbi	a5, XCHAL_DCACHE_LINESIZE * 3
+
+	addi	a5, a5, XCHAL_DCACHE_LINESIZE * 4
+	blt	a5, a6, 2b
+
+	addi	a3, a3, -1
+	addi	a2, a2, XCHAL_DCACHE_SIZE / XCHAL_DCACHE_WAYS
+	bgez	a3, 1b
+
+	retw
+
+ENTRY(__invalidate_icache_page_index)
+	entry	sp, 16
+
+	movi	a3, XCHAL_ICACHE_WAYS - 1
+	movi	a4, PAGE_SIZE
+
+1:	mov	a5, a2
+	add	a6, a2, a4
+
+2:	iii	a5, 0
+	iii	a5, XCHAL_ICACHE_LINESIZE
+	iii	a5, XCHAL_ICACHE_LINESIZE * 2
+	iii	a5, XCHAL_ICACHE_LINESIZE * 3
+
+	addi	a5, a5, XCHAL_ICACHE_LINESIZE * 4
+	blt	a5, a6, 2b
+
+	addi	a3, a3, -1
+	addi	a2, a2, XCHAL_ICACHE_SIZE / XCHAL_ICACHE_WAYS
+	bgez	a3, 2b
+
+	retw
+
+#endif
+
+
+
+
+
+

arch/xtensa/mm/pgtable.c

+/*
+ * arch/xtensa/mm/fault.c
+ *
+ * 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.
+ *
+ * Copyright (C) 2001 - 2005 Tensilica Inc.
+ *
+ * Chris Zankel <chris@zankel.net>
+ */
+
+#if (DCACHE_SIZE > PAGE_SIZE)
+
+pte_t* pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
+{
+	pte_t *pte, p;
+	int color = ADDR_COLOR(address);
+	int i;
+
+	p = (pte_t*) __get_free_pages(GFP_KERNEL|__GFP_REPEAT, COLOR_ORDER);
+
+	if (likely(p)) {
+		struct page *page;
+
+		for (i = 0; i < COLOR_SIZE; i++, p++) {
+			page = virt_to_page(pte);
+
+			set_page_count(page, 1);
+			ClearPageCompound(page);
+
+			if (ADDR_COLOR(p) == color)
+				pte = p;
+			else
+				free_page(p);
+		}
+		clear_page(pte);
+	}
+	return pte;
+}
+
+#ifdef PROFILING
+
+int mask;
+int hit;
+int flush;
+
+#endif
+
+struct page* pte_alloc_one(struct mm_struct *mm, unsigned long address)
+{
+	struct page *page, p;
+	int color = ADDR_COLOR(address);
+
+	p = alloc_pages(GFP_KERNEL | __GFP_REPEAT, PTE_ORDER);
+
+	if (likely(p)) {
+		for (i = 0; i < PAGE_ORDER; i++) {
+			set_page_count(p, 1);
+			ClearPageCompound(p);
+
+			if (PADDR_COLOR(page_address(pg)) == color)
+				page = p;
+			else
+				free_page(p);
+		}
+		clear_highpage(page);
+	}
+
+	return page;
+}
+
+#endif
+
+
+

arch/xtensa/mm/tlb.c

+/*
+ * arch/xtensa/mm/mmu.c
+ *
+ * Logic that manipulates the Xtensa MMU.  Derived from MIPS.
+ *
+ * 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.
+ *
+ * Copyright (C) 2001 - 2003 Tensilica Inc.
+ *
+ * Joe Taylor
+ * Chris Zankel	<chris@zankel.net>
+ * Marc Gauthier
+ */
+
+#include <linux/mm.h>
+#include <asm/processor.h>
+#include <asm/mmu_context.h>
+#include <asm/tlbflush.h>
+#include <asm/system.h>
+#include <asm/cacheflush.h>
+
+
+static inline void __flush_itlb_all (void)
+{
+	int way, index;
+
+	for (way = 0; way < XCHAL_ITLB_ARF_WAYS; way++) {
+		for (index = 0; index < ITLB_ENTRIES_PER_ARF_WAY; index++) {
+			int entry = way + (index << PAGE_SHIFT);
+			invalidate_itlb_entry_no_isync (entry);
+		}
+	}
+	asm volatile ("isync\n");
+}
+
+static inline void __flush_dtlb_all (void)
+{
+	int way, index;
+
+	for (way = 0; way < XCHAL_DTLB_ARF_WAYS; way++) {
+		for (index = 0; index < DTLB_ENTRIES_PER_ARF_WAY; index++) {
+			int entry = way + (index << PAGE_SHIFT);
+			invalidate_dtlb_entry_no_isync (entry);
+		}
+	}
+	asm volatile ("isync\n");
+}
+
+
+void flush_tlb_all (void)
+{
+	__flush_itlb_all();
+	__flush_dtlb_all();
+}
+
+/* If mm is current, we simply assign the current task a new ASID, thus,
+ * invalidating all previous tlb entries. If mm is someone else's user mapping,
+ * wie invalidate the context, thus, when that user mapping is swapped in,
+ * a new context will be assigned to it.
+ */
+
+void flush_tlb_mm(struct mm_struct *mm)
+{
+#if 0
+	printk("[tlbmm<%lx>]\n", (unsigned long)mm->context);
+#endif
+
+	if (mm == current->active_mm) {
+		int flags;
+		local_save_flags(flags);
+		get_new_mmu_context(mm, asid_cache);
+		set_rasid_register(ASID_INSERT(mm->context));
+		local_irq_restore(flags);
+	}
+	else
+		mm->context = 0;
+}
+
+void flush_tlb_range (struct vm_area_struct *vma,
+    		      unsigned long start, unsigned long end)
+{
+	struct mm_struct *mm = vma->vm_mm;
+	unsigned long flags;
+
+	if (mm->context == NO_CONTEXT)
+		return;
+
+#if 0
+	printk("[tlbrange<%02lx,%08lx,%08lx>]\n",
+			(unsigned long)mm->context, start, end);
+#endif
+	local_save_flags(flags);
+
+	if (end-start + (PAGE_SIZE-1) <= SMALLEST_NTLB_ENTRIES << PAGE_SHIFT) {
+		int oldpid = get_rasid_register();
+		set_rasid_register (ASID_INSERT(mm->context));
+		start &= PAGE_MASK;
+ 		if (vma->vm_flags & VM_EXEC)
+			while(start < end) {
+				invalidate_itlb_mapping(start);
+				invalidate_dtlb_mapping(start);
+				start += PAGE_SIZE;
+			}
+		else
+			while(start < end) {
+				invalidate_dtlb_mapping(start);
+				start += PAGE_SIZE;
+			}
+
+		set_rasid_register(oldpid);
+	} else {
+		get_new_mmu_context(mm, asid_cache);
+		if (mm == current->active_mm)
+			set_rasid_register(ASID_INSERT(mm->context));
+	}
+	local_irq_restore(flags);
+}
+
+void flush_tlb_page (struct vm_area_struct *vma, unsigned long page)
+{
+	struct mm_struct* mm = vma->vm_mm;
+	unsigned long flags;
+	int oldpid;
+#if 0
+	printk("[tlbpage<%02lx,%08lx>]\n",
+			(unsigned long)mm->context, page);
+#endif
+
+	if(mm->context == NO_CONTEXT)
+		return;
+
+	local_save_flags(flags);
+
+       	oldpid = get_rasid_register();
+
+	if (vma->vm_flags & VM_EXEC)
+		invalidate_itlb_mapping(page);
+	invalidate_dtlb_mapping(page);
+
+	set_rasid_register(oldpid);
+
+	local_irq_restore(flags);
+
+#if 0
+	flush_tlb_all();
+	return;
+#endif
+}
+
+
+#ifdef DEBUG_TLB
+
+#define USE_ITLB  0
+#define USE_DTLB  1
+
+struct way_config_t {
+	int indicies;
+	int indicies_log2;
+	int pgsz_log2;
+	int arf;
+};
+
+static struct way_config_t itlb[XCHAL_ITLB_WAYS] =
+{
+	{ XCHAL_ITLB_SET(XCHAL_ITLB_WAY0_SET, ENTRIES),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY0_SET, ENTRIES_LOG2),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY0_SET, PAGESZ_LOG2_MIN),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY0_SET, ARF)
+	},
+	{ XCHAL_ITLB_SET(XCHAL_ITLB_WAY1_SET, ENTRIES),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY1_SET, ENTRIES_LOG2),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY1_SET, PAGESZ_LOG2_MIN),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY1_SET, ARF)
+	},
+	{ XCHAL_ITLB_SET(XCHAL_ITLB_WAY2_SET, ENTRIES),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY2_SET, ENTRIES_LOG2),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY2_SET, PAGESZ_LOG2_MIN),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY2_SET, ARF)
+	},
+	{ XCHAL_ITLB_SET(XCHAL_ITLB_WAY3_SET, ENTRIES),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY3_SET, ENTRIES_LOG2),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY3_SET, PAGESZ_LOG2_MIN),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY3_SET, ARF)
+	},
+	{ XCHAL_ITLB_SET(XCHAL_ITLB_WAY4_SET, ENTRIES),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY4_SET, ENTRIES_LOG2),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY4_SET, PAGESZ_LOG2_MIN),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY4_SET, ARF)
+	},
+	{ XCHAL_ITLB_SET(XCHAL_ITLB_WAY5_SET, ENTRIES),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY5_SET, ENTRIES_LOG2),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY5_SET, PAGESZ_LOG2_MIN),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY5_SET, ARF)
+	},
+	{ XCHAL_ITLB_SET(XCHAL_ITLB_WAY6_SET, ENTRIES),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY6_SET, ENTRIES_LOG2),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY6_SET, PAGESZ_LOG2_MIN),
+	  XCHAL_ITLB_SET(XCHAL_ITLB_WAY6_SET, ARF)
+	}
+};
+
+static struct way_config_t dtlb[XCHAL_DTLB_WAYS] =
+{
+	{ XCHAL_DTLB_SET(XCHAL_DTLB_WAY0_SET, ENTRIES),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY0_SET, ENTRIES_LOG2),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY0_SET, PAGESZ_LOG2_MIN),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY0_SET, ARF)
+	},
+	{ XCHAL_DTLB_SET(XCHAL_DTLB_WAY1_SET, ENTRIES),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY1_SET, ENTRIES_LOG2),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY1_SET, PAGESZ_LOG2_MIN),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY1_SET, ARF)
+	},
+	{ XCHAL_DTLB_SET(XCHAL_DTLB_WAY2_SET, ENTRIES),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY2_SET, ENTRIES_LOG2),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY2_SET, PAGESZ_LOG2_MIN),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY2_SET, ARF)
+	},
+	{ XCHAL_DTLB_SET(XCHAL_DTLB_WAY3_SET, ENTRIES),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY3_SET, ENTRIES_LOG2),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY3_SET, PAGESZ_LOG2_MIN),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY3_SET, ARF)
+	},
+	{ XCHAL_DTLB_SET(XCHAL_DTLB_WAY4_SET, ENTRIES),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY4_SET, ENTRIES_LOG2),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY4_SET, PAGESZ_LOG2_MIN),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY4_SET, ARF)
+	},
+	{ XCHAL_DTLB_SET(XCHAL_DTLB_WAY5_SET, ENTRIES),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY5_SET, ENTRIES_LOG2),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY5_SET, PAGESZ_LOG2_MIN),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY5_SET, ARF)
+	},
+	{ XCHAL_DTLB_SET(XCHAL_DTLB_WAY6_SET, ENTRIES),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY6_SET, ENTRIES_LOG2),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY6_SET, PAGESZ_LOG2_MIN),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY6_SET, ARF)
+	},
+	{ XCHAL_DTLB_SET(XCHAL_DTLB_WAY7_SET, ENTRIES),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY7_SET, ENTRIES_LOG2),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY7_SET, PAGESZ_LOG2_MIN),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY7_SET, ARF)
+	},
+	{ XCHAL_DTLB_SET(XCHAL_DTLB_WAY8_SET, ENTRIES),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY8_SET, ENTRIES_LOG2),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY8_SET, PAGESZ_LOG2_MIN),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY8_SET, ARF)
+	},
+	{ XCHAL_DTLB_SET(XCHAL_DTLB_WAY9_SET, ENTRIES),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY9_SET, ENTRIES_LOG2),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY9_SET, PAGESZ_LOG2_MIN),
+	  XCHAL_DTLB_SET(XCHAL_DTLB_WAY9_SET, ARF)
+	}
+};
+
+/*  Total number of entries:  */
+#define ITLB_TOTAL_ENTRIES	\
+		XCHAL_ITLB_SET(XCHAL_ITLB_WAY0_SET, ENTRIES) + \
+		XCHAL_ITLB_SET(XCHAL_ITLB_WAY1_SET, ENTRIES) + \
+		XCHAL_ITLB_SET(XCHAL_ITLB_WAY2_SET, ENTRIES) + \
+		XCHAL_ITLB_SET(XCHAL_ITLB_WAY3_SET, ENTRIES) + \
+		XCHAL_ITLB_SET(XCHAL_ITLB_WAY4_SET, ENTRIES) + \
+		XCHAL_ITLB_SET(XCHAL_ITLB_WAY5_SET, ENTRIES) + \
+		XCHAL_ITLB_SET(XCHAL_ITLB_WAY6_SET, ENTRIES)
+#define DTLB_TOTAL_ENTRIES	\
+		XCHAL_DTLB_SET(XCHAL_DTLB_WAY0_SET, ENTRIES) + \
+		XCHAL_DTLB_SET(XCHAL_DTLB_WAY1_SET, ENTRIES) + \
+		XCHAL_DTLB_SET(XCHAL_DTLB_WAY2_SET, ENTRIES) + \
+		XCHAL_DTLB_SET(XCHAL_DTLB_WAY3_SET, ENTRIES) + \
+		XCHAL_DTLB_SET(XCHAL_DTLB_WAY4_SET, ENTRIES) + \
+		XCHAL_DTLB_SET(XCHAL_DTLB_WAY5_SET, ENTRIES) + \
+		XCHAL_DTLB_SET(XCHAL_DTLB_WAY6_SET, ENTRIES) + \
+		XCHAL_DTLB_SET(XCHAL_DTLB_WAY7_SET, ENTRIES) + \
+		XCHAL_DTLB_SET(XCHAL_DTLB_WAY8_SET, ENTRIES) + \
+		XCHAL_DTLB_SET(XCHAL_DTLB_WAY9_SET, ENTRIES)
+
+
+typedef struct {
+    unsigned		va;
+    unsigned		pa;
+    unsigned char	asid;
+    unsigned char	ca;
+    unsigned char	way;
+    unsigned char	index;
+    unsigned char	pgsz_log2;	/* 0 .. 32 */
+    unsigned char	type;		/* 0=ITLB 1=DTLB */
+} tlb_dump_entry_t;
+
+/*  Return -1 if a precedes b, +1 if a follows b, 0 if same:  */
+int cmp_tlb_dump_info( tlb_dump_entry_t *a, tlb_dump_entry_t *b )
+{
+    if (a->asid < b->asid) return -1;
+    if (a->asid > b->asid) return  1;
+    if (a->va < b->va) return -1;
+    if (a->va > b->va) return  1;
+    if (a->pa < b->pa) return -1;
+    if (a->pa > b->pa) return  1;
+    if (a->ca < b->ca) return -1;
+    if (a->ca > b->ca) return  1;
+    if (a->way < b->way) return -1;
+    if (a->way > b->way) return  1;
+    if (a->index < b->index) return -1;
+    if (a->index > b->index) return  1;
+    return 0;
+}
+
+void sort_tlb_dump_info( tlb_dump_entry_t *t, int n )
+{
+    int i, j;
+    /*  Simple O(n*n) sort:  */
+    for (i = 0; i < n-1; i++)
+	for (j = i+1; j < n; j++)
+	    if (cmp_tlb_dump_info(t+i, t+j) > 0) {
+		tlb_dump_entry_t tmp = t[i];
+		t[i] = t[j];
+		t[j] = tmp;
+	    }
+}
+
+
+static tlb_dump_entry_t itlb_dump_info[ITLB_TOTAL_ENTRIES];
+static tlb_dump_entry_t dtlb_dump_info[DTLB_TOTAL_ENTRIES];
+
+
+static inline char *way_type (int type)
+{
+	return type ? "autorefill" : "non-autorefill";
+}
+
+void print_entry (struct way_config_t *way_info,
+		  unsigned int way,
+		  unsigned int index,
+		  unsigned int virtual,
+		  unsigned int translation)
+{
+	char valid_chr;
+	unsigned int va, pa, asid, ca;
+
+	va = virtual &
+	  	~((1 << (way_info->pgsz_log2 + way_info->indicies_log2)) - 1);
+	asid = virtual & ((1 << XCHAL_MMU_ASID_BITS) - 1);
+	pa = translation & ~((1 << way_info->pgsz_log2) - 1);
+	ca = translation & ((1 << XCHAL_MMU_CA_BITS) - 1);
+	valid_chr = asid ? 'V' : 'I';
+
+	/* Compute and incorporate the effect of the index bits on the
+	 * va.  It's more useful for kernel debugging, since we always
+	 * want to know the effective va anyway. */
+
+	va += index << way_info->pgsz_log2;
+
+	printk ("\t[%d,%d] (%c) vpn 0x%.8x  ppn 0x%.8x  asid 0x%.2x  am 0x%x\n",
+		way, index, valid_chr, va, pa, asid, ca);
+}
+
+void print_itlb_entry (struct way_config_t *way_info, int way, int index)
+{
+	print_entry (way_info, way, index,
+		     read_itlb_virtual (way + (index << way_info->pgsz_log2)),
+		     read_itlb_translation (way + (index << way_info->pgsz_log2)));
+}
+
+void print_dtlb_entry (struct way_config_t *way_info, int way, int index)
+{
+	print_entry (way_info, way, index,
+		     read_dtlb_virtual (way + (index << way_info->pgsz_log2)),
+		     read_dtlb_translation (way + (index << way_info->pgsz_log2)));
+}
+
+void dump_itlb (void)
+{
+	int way, index;
+
+	printk ("\nITLB: ways = %d\n", XCHAL_ITLB_WAYS);
+
+	for (way = 0; way < XCHAL_ITLB_WAYS; way++) {
+		printk ("\nWay: %d, Entries: %d, MinPageSize: %d, Type: %s\n",
+			way, itlb[way].indicies,
+			itlb[way].pgsz_log2, way_type(itlb[way].arf));
+		for (index = 0; index < itlb[way].indicies; index++) {
+			print_itlb_entry(&itlb[way], way, index);
+		}
+	}
+}
+
+void dump_dtlb (void)
+{
+	int way, index;
+
+	printk ("\nDTLB: ways = %d\n", XCHAL_DTLB_WAYS);
+
+	for (way = 0; way < XCHAL_DTLB_WAYS; way++) {
+		printk ("\nWay: %d, Entries: %d, MinPageSize: %d, Type: %s\n",
+			way, dtlb[way].indicies,
+			dtlb[way].pgsz_log2, way_type(dtlb[way].arf));
+		for (index = 0; index < dtlb[way].indicies; index++) {
+			print_dtlb_entry(&dtlb[way], way, index);
+		}
+	}
+}
+
+void dump_tlb (tlb_dump_entry_t *tinfo, struct way_config_t *config,
+		int entries, int ways, int type, int show_invalid)
+{
+    tlb_dump_entry_t *e = tinfo;
+    int way, i;
+
+    /*  Gather all info:  */
+    for (way = 0; way < ways; way++) {
+	struct way_config_t *cfg = config + way;
+	for (i = 0; i < cfg->indicies; i++) {
+	    unsigned wayindex = way + (i << cfg->pgsz_log2);
+	    unsigned vv = (type ? read_dtlb_virtual (wayindex)
+		    		: read_itlb_virtual (wayindex));
+	    unsigned pp = (type ? read_dtlb_translation (wayindex)
+		    		: read_itlb_translation (wayindex));
+
+	    /* Compute and incorporate the effect of the index bits on the
+	     * va.  It's more useful for kernel debugging, since we always
+	     * want to know the effective va anyway. */
+
+	    e->va = (vv & ~((1 << (cfg->pgsz_log2 + cfg->indicies_log2)) - 1));
+	    e->va += (i << cfg->pgsz_log2);
+	    e->pa = (pp & ~((1 << cfg->pgsz_log2) - 1));
+	    e->asid = (vv & ((1 << XCHAL_MMU_ASID_BITS) - 1));
+	    e->ca = (pp & ((1 << XCHAL_MMU_CA_BITS) - 1));
+	    e->way = way;
+	    e->index = i;
+	    e->pgsz_log2 = cfg->pgsz_log2;
+	    e->type = type;
+	    e++;
+	}
+    }
+#if 1
+    /*  Sort by ASID and VADDR:  */
+    sort_tlb_dump_info (tinfo, entries);
+#endif
+
+    /*  Display all sorted info:  */
+    printk ("\n%cTLB dump:\n", (type ? 'D' : 'I'));
+    for (e = tinfo, i = 0; i < entries; i++, e++) {
+#if 0
+	if (e->asid == 0 && !show_invalid)
+	    continue;
+#endif
+	printk ("%c way=%d i=%d  ASID=%02X V=%08X -> P=%08X CA=%X (%d %cB)\n",
+		(e->type ? 'D' : 'I'), e->way, e->index,
+		e->asid, e->va, e->pa, e->ca,
+		(1 << (e->pgsz_log2 % 10)),
+		" kMG"[e->pgsz_log2 / 10]
+		);
+    }
+}
+
+void dump_tlbs2 (int showinv)
+{
+    dump_tlb (itlb_dump_info, itlb, ITLB_TOTAL_ENTRIES, XCHAL_ITLB_WAYS, 0, showinv);
+    dump_tlb (dtlb_dump_info, dtlb, DTLB_TOTAL_ENTRIES, XCHAL_DTLB_WAYS, 1, showinv);
+}
+
+void dump_all_tlbs (void)
+{
+    dump_tlbs2 (1);
+}
+
+void dump_valid_tlbs (void)
+{
+    dump_tlbs2 (0);
+}
+
+
+void dump_tlbs (void)
+{
+	dump_itlb();
+	dump_dtlb();
+}
+
+void dump_cache_tag(int dcache, int idx)
+{
+	int w, i, s, e;
+	unsigned long tag, index;
+	unsigned long num_lines, num_ways, cache_size, line_size;
+
+	num_ways = dcache ? XCHAL_DCACHE_WAYS : XCHAL_ICACHE_WAYS;
+	cache_size = dcache ? XCHAL_DCACHE_SIZE : XCHAL_ICACHE_SIZE;
+	line_size = dcache ? XCHAL_DCACHE_LINESIZE : XCHAL_ICACHE_LINESIZE;
+
+	num_lines = cache_size / num_ways;
+
+	s = 0; e = num_lines;
+
+	if (idx >= 0)
+		e = (s = idx * line_size) + 1;
+
+	for (i = s; i < e; i+= line_size) {
+		printk("\nline %#08x:", i);
+		for (w = 0; w < num_ways; w++) {
+			index = w * num_lines + i;
+			if (dcache)
+				__asm__ __volatile__("ldct %0, %1\n\t"
+						: "=a"(tag) : "a"(index));
+			else
+				__asm__ __volatile__("lict %0, %1\n\t"
+						: "=a"(tag) : "a"(index));
+
+			printk(" %#010lx", tag);
+		}
+	}
+	printk ("\n");
+}
+
+void dump_icache(int index)
+{
+	unsigned long data, addr;
+	int w, i;
+
+	const unsigned long num_ways = XCHAL_ICACHE_WAYS;
+	const unsigned long cache_size = XCHAL_ICACHE_SIZE;
+	const unsigned long line_size = XCHAL_ICACHE_LINESIZE;
+	const unsigned long num_lines = cache_size / num_ways / line_size;
+
+	for (w = 0; w < num_ways; w++) {
+		printk ("\nWay %d", w);
+
+		for (i = 0; i < line_size; i+= 4) {
+			addr = w * num_lines + index * line_size + i;
+			__asm__ __volatile__("licw %0, %1\n\t"
+					: "=a"(data) : "a"(addr));
+			printk(" %#010lx", data);
+		}
+	}
+	printk ("\n");
+}
+
+void dump_cache_tags(void)
+{
+	printk("Instruction cache\n");
+	dump_cache_tag(0, -1);
+	printk("Data cache\n");
+	dump_cache_tag(1, -1);
+}
+
+#endif