1 files changed, 253 insertions, 391 deletions

diff --git a/arch/xtensa/mm/init.c b/arch/xtensa/mm/init.c
index 5a91d6c9e66..77ed20209ca 100644
--- a/arch/xtensa/mm/init.c
+++ b/arch/xtensa/mm/init.c
@@ -8,6 +8,7 @@
  * for more details.
  *
  * Copyright (C) 2001 - 2005 Tensilica Inc.
+ * Copyright (C) 2014 Cadence Design Systems Inc.
  *
  * Chris Zankel	<chris@zankel.net>
  * Joe Taylor	<joe@tensilica.com, joetylr@yahoo.com>
@@ -15,51 +16,146 @@
  * 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/gfp.h>
+#include <linux/highmem.h>
 #include <linux/swap.h>
+#include <linux/mman.h>
+#include <linux/nodemask.h>
+#include <linux/mm.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>
+#include <asm/sections.h>
+#include <asm/sysmem.h>
 
+struct sysmem_info sysmem __initdata;
 
-#define DEBUG 0
+static void __init sysmem_dump(void)
+{
+	unsigned i;
+
+	pr_debug("Sysmem:\n");
+	for (i = 0; i < sysmem.nr_banks; ++i)
+		pr_debug("  0x%08lx - 0x%08lx (%ldK)\n",
+			 sysmem.bank[i].start, sysmem.bank[i].end,
+			 (sysmem.bank[i].end - sysmem.bank[i].start) >> 10);
+}
+
+/*
+ * Find bank with maximal .start such that bank.start <= start
+ */
+static inline struct meminfo * __init find_bank(unsigned long start)
+{
+	unsigned i;
+	struct meminfo *it = NULL;
+
+	for (i = 0; i < sysmem.nr_banks; ++i)
+		if (sysmem.bank[i].start <= start)
+			it = sysmem.bank + i;
+		else
+			break;
+	return it;
+}
 
-DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
-//static DEFINE_SPINLOCK(tlb_lock);
+/*
+ * Move all memory banks starting at 'from' to a new place at 'to',
+ * adjust nr_banks accordingly.
+ * Both 'from' and 'to' must be inside the sysmem.bank.
+ *
+ * Returns: 0 (success), -ENOMEM (not enough space in the sysmem.bank).
+ */
+static int __init move_banks(struct meminfo *to, struct meminfo *from)
+{
+	unsigned n = sysmem.nr_banks - (from - sysmem.bank);
+
+	if (to > from && to - from + sysmem.nr_banks > SYSMEM_BANKS_MAX)
+		return -ENOMEM;
+	if (to != from)
+		memmove(to, from, n * sizeof(struct meminfo));
+	sysmem.nr_banks += to - from;
+	return 0;
+}
 
 /*
- * 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.
+ * Add new bank to sysmem. Resulting sysmem is the union of bytes of the
+ * original sysmem and the new bank.
+ *
+ * Returns: 0 (success), < 0 (error)
  */
+int __init add_sysmem_bank(unsigned long start, unsigned long end)
+{
+	unsigned i;
+	struct meminfo *it = NULL;
+	unsigned long sz;
+	unsigned long bank_sz = 0;
+
+	if (start == end ||
+	    (start < end) != (PAGE_ALIGN(start) < (end & PAGE_MASK))) {
+		pr_warn("Ignoring small memory bank 0x%08lx size: %ld bytes\n",
+			start, end - start);
+		return -EINVAL;
+	}
 
-#define PG_cache_clean PG_arch_1
+	start = PAGE_ALIGN(start);
+	end &= PAGE_MASK;
+	sz = end - start;
 
-/* References to section boundaries */
+	it = find_bank(start);
 
-extern char _ftext, _etext, _fdata, _edata, _rodata_end;
-extern char __init_begin, __init_end;
+	if (it)
+		bank_sz = it->end - it->start;
+
+	if (it && bank_sz >= start - it->start) {
+		if (end - it->start > bank_sz)
+			it->end = end;
+		else
+			return 0;
+	} else {
+		if (!it)
+			it = sysmem.bank;
+		else
+			++it;
+
+		if (it - sysmem.bank < sysmem.nr_banks &&
+		    it->start - start <= sz) {
+			it->start = start;
+			if (it->end - it->start < sz)
+				it->end = end;
+			else
+				return 0;
+		} else {
+			if (move_banks(it + 1, it) < 0) {
+				pr_warn("Ignoring memory bank 0x%08lx size %ld bytes\n",
+					start, end - start);
+				return -EINVAL;
+			}
+			it->start = start;
+			it->end = end;
+			return 0;
+		}
+	}
+	sz = it->end - it->start;
+	for (i = it + 1 - sysmem.bank; i < sysmem.nr_banks; ++i)
+		if (sysmem.bank[i].start - it->start <= sz) {
+			if (sz < sysmem.bank[i].end - it->start)
+				it->end = sysmem.bank[i].end;
+		} else {
+			break;
+		}
+
+	move_banks(it + 1, sysmem.bank + i);
+	return 0;
+}
 
 /*
  * mem_reserve(start, end, must_exist)
  *
  * Reserve some memory from the memory pool.
+ * If must_exist is set and a part of the region being reserved does not exist
+ * memory map is not altered.
  *
  * Parameters:
  *  start	Start of region,
@@ -67,58 +163,74 @@ extern char __init_begin, __init_end;
  *  must_exist	Must exist in memory pool.
  *
  * Returns:
- *  0 (memory area couldn't be mapped)
- * -1 (success)
+ *  0 (success)
+ *  < 0 (error)
  */
 
 int __init mem_reserve(unsigned long start, unsigned long end, int must_exist)
 {
-	int i;
-
-	if (start == end)
-		return 0;
+	struct meminfo *it;
+	struct meminfo *rm = NULL;
+	unsigned long sz;
+	unsigned long bank_sz = 0;
 
 	start = start & PAGE_MASK;
 	end = PAGE_ALIGN(end);
+	sz = end - start;
+	if (!sz)
+		return -EINVAL;
 
-	for (i = 0; i < sysmem.nr_banks; i++)
-		if (start < sysmem.bank[i].end
-		    && end >= sysmem.bank[i].start)
-			break;
+	it = find_bank(start);
+
+	if (it)
+		bank_sz = it->end - it->start;
 
-	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 ((!it || end - it->start > bank_sz) && must_exist) {
+		pr_warn("mem_reserve: [0x%0lx, 0x%0lx) not in any region!\n",
+			start, end);
+		return -EINVAL;
 	}
 
-	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++;
+	if (it && start - it->start <= bank_sz) {
+		if (start == it->start) {
+			if (end - it->start < bank_sz) {
+				it->start = end;
+				return 0;
+			} else {
+				rm = it;
+			}
+		} else {
+			it->end = start;
+			if (end - it->start < bank_sz)
+				return add_sysmem_bank(end,
+						       it->start + bank_sz);
+			++it;
 		}
-		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;
+	}
+
+	if (!it)
+		it = sysmem.bank;
+
+	for (; it < sysmem.bank + sysmem.nr_banks; ++it) {
+		if (it->end - start <= sz) {
+			if (!rm)
+				rm = it;
+		} else {
+			if (it->start - start < sz)
+				it->start = end;
+			break;
 		}
 	}
-	return -1;
+
+	if (rm)
+		move_banks(rm, it);
+
+	return 0;
 }
 
 
 /*
- * Initialize the bootmem system and give it all the memory we have available.
+ * Initialize the bootmem system and give it all low memory we have available.
  */
 
 void __init bootmem_init(void)
@@ -127,6 +239,7 @@ void __init bootmem_init(void)
 	unsigned long bootmap_start, bootmap_size;
 	int i;
 
+	sysmem_dump();
 	max_low_pfn = max_pfn = 0;
 	min_low_pfn = ~0;
 
@@ -142,12 +255,13 @@ void __init bootmem_init(void)
 	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;
+	max_low_pfn = max_pfn < MAX_MEM_PFN >> PAGE_SHIFT ?
+		max_pfn : MAX_MEM_PFN >> PAGE_SHIFT;
 
 	/* Find an area to use for the bootmem bitmap. */
 
-	bootmap_size = bootmem_bootmap_pages(max_low_pfn) << PAGE_SHIFT;
+	bootmap_size = bootmem_bootmap_pages(max_low_pfn - min_low_pfn);
+	bootmap_size <<= PAGE_SHIFT;
 	bootmap_start = ~0;
 
 	for (i=0; i<sysmem.nr_banks; i++)
@@ -162,68 +276,35 @@ void __init bootmem_init(void)
 	/* 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_size = init_bootmem_node(NODE_DATA(0),
 					 bootmap_start >> PAGE_SHIFT,
+					 min_low_pfn,
 					 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);
+	for (i = 0; i < sysmem.nr_banks; i++) {
+		if (sysmem.bank[i].start >> PAGE_SHIFT < max_low_pfn) {
+			unsigned long end = min(max_low_pfn << PAGE_SHIFT,
+						sysmem.bank[i].end);
+			free_bootmem(sysmem.bank[i].start,
+				     end - sysmem.bank[i].start);
+		}
+	}
 
 }
 
 
-void __init paging_init(void)
+void __init zones_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;
-
+	unsigned long zones_size[MAX_NR_ZONES] = {
+		[ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET,
 #ifdef CONFIG_HIGHMEM
-	zones_size[ZONE_HIGHMEM] = max_pfn - max_low_pfn;
+		[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);
+	};
+	free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL);
 }
 
 /*
@@ -232,50 +313,38 @@ void __init init_mmu (void)
 
 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;
-
 #ifdef CONFIG_HIGHMEM
-#error HIGHGMEM not implemented in init.c
-#endif
+	unsigned long tmp;
 
-	totalram_pages += free_all_bootmem();
+	reset_all_zones_managed_pages();
+	for (tmp = max_low_pfn; tmp < max_pfn; tmp++)
+		free_highmem_page(pfn_to_page(tmp));
+#endif
 
-	reservedpages = ram = 0;
-	for (tmp = 0; tmp < max_low_pfn; tmp++) {
-		ram++;
-		if (PageReserved(mem_map+tmp))
-			reservedpages++;
-	}
+	max_mapnr = max_pfn - ARCH_PFN_OFFSET;
+	high_memory = (void *)__va(max_low_pfn << PAGE_SHIFT);
 
-	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);
-}
+	free_all_bootmem();
 
-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++;
-	}
+	mem_init_print_info(NULL);
+	pr_info("virtual kernel memory layout:\n"
+#ifdef CONFIG_HIGHMEM
+		"    pkmap   : 0x%08lx - 0x%08lx  (%5lu kB)\n"
+		"    fixmap  : 0x%08lx - 0x%08lx  (%5lu kB)\n"
+#endif
+		"    vmalloc : 0x%08x - 0x%08x  (%5u MB)\n"
+		"    lowmem  : 0x%08x - 0x%08lx  (%5lu MB)\n",
+#ifdef CONFIG_HIGHMEM
+		PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE,
+		(LAST_PKMAP*PAGE_SIZE) >> 10,
+		FIXADDR_START, FIXADDR_TOP,
+		(FIXADDR_TOP - FIXADDR_START) >> 10,
+#endif
+		VMALLOC_START, VMALLOC_END,
+		(VMALLOC_END - VMALLOC_START) >> 20,
+		PAGE_OFFSET, PAGE_OFFSET +
+		(max_low_pfn - min_low_pfn) * PAGE_SIZE,
+		((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20);
 }
 
 #ifdef CONFIG_BLK_DEV_INITRD
@@ -283,269 +352,62 @@ 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);
-	}
+	if (initrd_is_mapped)
+		free_reserved_area((void *)start, (void *)end, -1, "initrd");
 }
 #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);
+	free_initmem_default(-1);
 }
 
-void show_mem(void)
+static void __init parse_memmap_one(char *p)
 {
-	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)
+	char *oldp;
+	unsigned long start_at, mem_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))
+	if (!p)
 		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. */
+	oldp = p;
+	mem_size = memparse(p, &p);
+	if (p == oldp)
+		return;
 
-	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();
-	}
-}
+	switch (*p) {
+	case '@':
+		start_at = memparse(p + 1, &p);
+		add_sysmem_bank(start_at, start_at + mem_size);
+		break;
 
-#endif	/* (DCACHE_WAY_SIZE > PAGE_SIZE) */
+	case '$':
+		start_at = memparse(p + 1, &p);
+		mem_reserve(start_at, start_at + mem_size, 0);
+		break;
 
+	case 0:
+		mem_reserve(mem_size, 0, 0);
+		break;
 
-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);
+	default:
+		pr_warn("Unrecognized memmap syntax: %s\n", p);
+		break;
 	}
-	return pte;
 }
 
-struct page* pte_alloc_one(struct mm_struct *mm, unsigned long addr)
+static int __init parse_memmap_opt(char *str)
 {
-	struct page *page;
+	while (str) {
+		char *k = strchr(str, ',');
 
-	page = alloc_pages(GFP_KERNEL | __GFP_REPEAT, 0);
+		if (k)
+			*k++ = 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);
+		parse_memmap_one(str);
+		str = k;
 	}
-	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);
-		}
-	}
+	return 0;
 }
-
+early_param("memmap", parse_memmap_opt);