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authorChris Zankel <czankel@tensilica.com>2005-06-23 22:01:24 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-24 00:05:22 -0700
commit3f65ce4d141e435e54c20ed2379d983d362a2cb5 (patch)
tree1e86807b3f215d90d9cf57aa609f73f856515b30 /arch/xtensa/mm
parent249ac17e96811acc3c6402317dd5d5c89d2cbf68 (diff)
downloadlinux-3f65ce4d141e435e54c20ed2379d983d362a2cb5.tar.gz
[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>
Diffstat (limited to 'arch/xtensa/mm')
-rw-r--r--arch/xtensa/mm/Makefile13
-rw-r--r--arch/xtensa/mm/fault.c241
-rw-r--r--arch/xtensa/mm/init.c551
-rw-r--r--arch/xtensa/mm/misc.S374
-rw-r--r--arch/xtensa/mm/pgtable.c76
-rw-r--r--arch/xtensa/mm/tlb.c545
6 files changed, 1800 insertions, 0 deletions
diff --git a/arch/xtensa/mm/Makefile b/arch/xtensa/mm/Makefile
new file mode 100644
index 00000000000..a5aed5932d7
--- /dev/null
+++ b/arch/xtensa/mm/Makefile
@@ -0,0 +1,13 @@
+#
+# 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- :=
diff --git a/arch/xtensa/mm/fault.c b/arch/xtensa/mm/fault.c
new file mode 100644
index 00000000000..a945a33e85a
--- /dev/null
+++ b/arch/xtensa/mm/fault.c
@@ -0,0 +1,241 @@
+// 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);
+}
+
diff --git a/arch/xtensa/mm/init.c b/arch/xtensa/mm/init.c
new file mode 100644
index 00000000000..56aace84aae
--- /dev/null
+++ b/arch/xtensa/mm/init.c
@@ -0,0 +1,551 @@
+/*
+ * 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);
+ }
+ }
+}
+
diff --git a/arch/xtensa/mm/misc.S b/arch/xtensa/mm/misc.S
new file mode 100644
index 00000000000..327c0f17187
--- /dev/null
+++ b/arch/xtensa/mm/misc.S
@@ -0,0 +1,374 @@
+/*
+ * 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
+
+
+
+
+
+
diff --git a/arch/xtensa/mm/pgtable.c b/arch/xtensa/mm/pgtable.c
new file mode 100644
index 00000000000..e5e119c820e
--- /dev/null
+++ b/arch/xtensa/mm/pgtable.c
@@ -0,0 +1,76 @@
+/*
+ * 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
+
+
+
diff --git a/arch/xtensa/mm/tlb.c b/arch/xtensa/mm/tlb.c
new file mode 100644
index 00000000000..d3bd3bfc3b3
--- /dev/null
+++ b/arch/xtensa/mm/tlb.c
@@ -0,0 +1,545 @@
+/*
+ * 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