Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 621 insertions, 0 deletions

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
new file mode 100644
index 000000000000..41156c5370f7
--- /dev/null
+++ b/arch/arm/mm/init.c
@@ -0,0 +1,621 @@
+/*
+ *  linux/arch/arm/mm/init.c
+ *
+ *  Copyright (C) 1995-2002 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/swap.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/mman.h>
+#include <linux/nodemask.h>
+#include <linux/initrd.h>
+
+#include <asm/mach-types.h>
+#include <asm/hardware.h>
+#include <asm/setup.h>
+#include <asm/tlb.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+
+#define TABLE_SIZE	(2 * PTRS_PER_PTE * sizeof(pte_t))
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
+extern void _stext, _text, _etext, __data_start, _end, __init_begin, __init_end;
+extern unsigned long phys_initrd_start;
+extern unsigned long phys_initrd_size;
+
+/*
+ * The sole use of this is to pass memory configuration
+ * data from paging_init to mem_init.
+ */
+static struct meminfo meminfo __initdata = { 0, };
+
+/*
+ * empty_zero_page is a special page that is used for
+ * zero-initialized data and COW.
+ */
+struct page *empty_zero_page;
+
+void show_mem(void)
+{
+	int free = 0, total = 0, reserved = 0;
+	int shared = 0, cached = 0, slab = 0, node;
+
+	printk("Mem-info:\n");
+	show_free_areas();
+	printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
+
+	for_each_online_node(node) {
+		struct page *page, *end;
+
+		page = NODE_MEM_MAP(node);
+		end  = page + NODE_DATA(node)->node_spanned_pages;
+
+		do {
+			total++;
+			if (PageReserved(page))
+				reserved++;
+			else if (PageSwapCache(page))
+				cached++;
+			else if (PageSlab(page))
+				slab++;
+			else if (!page_count(page))
+				free++;
+			else
+				shared += page_count(page) - 1;
+			page++;
+		} while (page < end);
+	}
+
+	printk("%d pages of RAM\n", total);
+	printk("%d free pages\n", free);
+	printk("%d reserved pages\n", reserved);
+	printk("%d slab pages\n", slab);
+	printk("%d pages shared\n", shared);
+	printk("%d pages swap cached\n", cached);
+}
+
+struct node_info {
+	unsigned int start;
+	unsigned int end;
+	int bootmap_pages;
+};
+
+#define O_PFN_DOWN(x)	((x) >> PAGE_SHIFT)
+#define V_PFN_DOWN(x)	O_PFN_DOWN(__pa(x))
+
+#define O_PFN_UP(x)	(PAGE_ALIGN(x) >> PAGE_SHIFT)
+#define V_PFN_UP(x)	O_PFN_UP(__pa(x))
+
+#define PFN_SIZE(x)	((x) >> PAGE_SHIFT)
+#define PFN_RANGE(s,e)	PFN_SIZE(PAGE_ALIGN((unsigned long)(e)) - \
+				(((unsigned long)(s)) & PAGE_MASK))
+
+/*
+ * FIXME: We really want to avoid allocating the bootmap bitmap
+ * over the top of the initrd.  Hopefully, this is located towards
+ * the start of a bank, so if we allocate the bootmap bitmap at
+ * the end, we won't clash.
+ */
+static unsigned int __init
+find_bootmap_pfn(int node, struct meminfo *mi, unsigned int bootmap_pages)
+{
+	unsigned int start_pfn, bank, bootmap_pfn;
+
+	start_pfn   = V_PFN_UP(&_end);
+	bootmap_pfn = 0;
+
+	for (bank = 0; bank < mi->nr_banks; bank ++) {
+		unsigned int start, end;
+
+		if (mi->bank[bank].node != node)
+			continue;
+
+		start = O_PFN_UP(mi->bank[bank].start);
+		end   = O_PFN_DOWN(mi->bank[bank].size +
+				   mi->bank[bank].start);
+
+		if (end < start_pfn)
+			continue;
+
+		if (start < start_pfn)
+			start = start_pfn;
+
+		if (end <= start)
+			continue;
+
+		if (end - start >= bootmap_pages) {
+			bootmap_pfn = start;
+			break;
+		}
+	}
+
+	if (bootmap_pfn == 0)
+		BUG();
+
+	return bootmap_pfn;
+}
+
+/*
+ * Scan the memory info structure and pull out:
+ *  - the end of memory
+ *  - the number of nodes
+ *  - the pfn range of each node
+ *  - the number of bootmem bitmap pages
+ */
+static unsigned int __init
+find_memend_and_nodes(struct meminfo *mi, struct node_info *np)
+{
+	unsigned int i, bootmem_pages = 0, memend_pfn = 0;
+
+	for (i = 0; i < MAX_NUMNODES; i++) {
+		np[i].start = -1U;
+		np[i].end = 0;
+		np[i].bootmap_pages = 0;
+	}
+
+	for (i = 0; i < mi->nr_banks; i++) {
+		unsigned long start, end;
+		int node;
+
+		if (mi->bank[i].size == 0) {
+			/*
+			 * Mark this bank with an invalid node number
+			 */
+			mi->bank[i].node = -1;
+			continue;
+		}
+
+		node = mi->bank[i].node;
+
+		/*
+		 * Make sure we haven't exceeded the maximum number of nodes
+		 * that we have in this configuration.  If we have, we're in
+		 * trouble.  (maybe we ought to limit, instead of bugging?)
+		 */
+		if (node >= MAX_NUMNODES)
+			BUG();
+		node_set_online(node);
+
+		/*
+		 * Get the start and end pfns for this bank
+		 */
+		start = O_PFN_UP(mi->bank[i].start);
+		end   = O_PFN_DOWN(mi->bank[i].start + mi->bank[i].size);
+
+		if (np[node].start > start)
+			np[node].start = start;
+
+		if (np[node].end < end)
+			np[node].end = end;
+
+		if (memend_pfn < end)
+			memend_pfn = end;
+	}
+
+	/*
+	 * Calculate the number of pages we require to
+	 * store the bootmem bitmaps.
+	 */
+	for_each_online_node(i) {
+		if (np[i].end == 0)
+			continue;
+
+		np[i].bootmap_pages = bootmem_bootmap_pages(np[i].end -
+							    np[i].start);
+		bootmem_pages += np[i].bootmap_pages;
+	}
+
+	high_memory = __va(memend_pfn << PAGE_SHIFT);
+
+	/*
+	 * This doesn't seem to be used by the Linux memory
+	 * manager any more.  If we can get rid of it, we
+	 * also get rid of some of the stuff above as well.
+	 */
+	max_low_pfn = memend_pfn - O_PFN_DOWN(PHYS_OFFSET);
+	max_pfn = memend_pfn - O_PFN_DOWN(PHYS_OFFSET);
+
+	return bootmem_pages;
+}
+
+static int __init check_initrd(struct meminfo *mi)
+{
+	int initrd_node = -2;
+#ifdef CONFIG_BLK_DEV_INITRD
+	unsigned long end = phys_initrd_start + phys_initrd_size;
+
+	/*
+	 * Make sure that the initrd is within a valid area of
+	 * memory.
+	 */
+	if (phys_initrd_size) {
+		unsigned int i;
+
+		initrd_node = -1;
+
+		for (i = 0; i < mi->nr_banks; i++) {
+			unsigned long bank_end;
+
+			bank_end = mi->bank[i].start + mi->bank[i].size;
+
+			if (mi->bank[i].start <= phys_initrd_start &&
+			    end <= bank_end)
+				initrd_node = mi->bank[i].node;
+		}
+	}
+
+	if (initrd_node == -1) {
+		printk(KERN_ERR "initrd (0x%08lx - 0x%08lx) extends beyond "
+		       "physical memory - disabling initrd\n",
+		       phys_initrd_start, end);
+		phys_initrd_start = phys_initrd_size = 0;
+	}
+#endif
+
+	return initrd_node;
+}
+
+/*
+ * Reserve the various regions of node 0
+ */
+static __init void reserve_node_zero(unsigned int bootmap_pfn, unsigned int bootmap_pages)
+{
+	pg_data_t *pgdat = NODE_DATA(0);
+	unsigned long res_size = 0;
+
+	/*
+	 * Register the kernel text and data with bootmem.
+	 * Note that this can only be in node 0.
+	 */
+#ifdef CONFIG_XIP_KERNEL
+	reserve_bootmem_node(pgdat, __pa(&__data_start), &_end - &__data_start);
+#else
+	reserve_bootmem_node(pgdat, __pa(&_stext), &_end - &_stext);
+#endif
+
+	/*
+	 * Reserve the page tables.  These are already in use,
+	 * and can only be in node 0.
+	 */
+	reserve_bootmem_node(pgdat, __pa(swapper_pg_dir),
+			     PTRS_PER_PGD * sizeof(pgd_t));
+
+	/*
+	 * And don't forget to reserve the allocator bitmap,
+	 * which will be freed later.
+	 */
+	reserve_bootmem_node(pgdat, bootmap_pfn << PAGE_SHIFT,
+			     bootmap_pages << PAGE_SHIFT);
+
+	/*
+	 * Hmm... This should go elsewhere, but we really really need to
+	 * stop things allocating the low memory; ideally we need a better
+	 * implementation of GFP_DMA which does not assume that DMA-able
+	 * memory starts at zero.
+	 */
+	if (machine_is_integrator() || machine_is_cintegrator())
+		res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
+
+	/*
+	 * These should likewise go elsewhere.  They pre-reserve the
+	 * screen memory region at the start of main system memory.
+	 */
+	if (machine_is_edb7211())
+		res_size = 0x00020000;
+	if (machine_is_p720t())
+		res_size = 0x00014000;
+
+#ifdef CONFIG_SA1111
+	/*
+	 * Because of the SA1111 DMA bug, we want to preserve our
+	 * precious DMA-able memory...
+	 */
+	res_size = __pa(swapper_pg_dir) - PHYS_OFFSET;
+#endif
+	if (res_size)
+		reserve_bootmem_node(pgdat, PHYS_OFFSET, res_size);
+}
+
+/*
+ * Register all available RAM in this node with the bootmem allocator.
+ */
+static inline void free_bootmem_node_bank(int node, struct meminfo *mi)
+{
+	pg_data_t *pgdat = NODE_DATA(node);
+	int bank;
+
+	for (bank = 0; bank < mi->nr_banks; bank++)
+		if (mi->bank[bank].node == node)
+			free_bootmem_node(pgdat, mi->bank[bank].start,
+					  mi->bank[bank].size);
+}
+
+/*
+ * Initialise the bootmem allocator for all nodes.  This is called
+ * early during the architecture specific initialisation.
+ */
+static void __init bootmem_init(struct meminfo *mi)
+{
+	struct node_info node_info[MAX_NUMNODES], *np = node_info;
+	unsigned int bootmap_pages, bootmap_pfn, map_pg;
+	int node, initrd_node;
+
+	bootmap_pages = find_memend_and_nodes(mi, np);
+	bootmap_pfn   = find_bootmap_pfn(0, mi, bootmap_pages);
+	initrd_node   = check_initrd(mi);
+
+	map_pg = bootmap_pfn;
+
+	/*
+	 * Initialise the bootmem nodes.
+	 *
+	 * What we really want to do is:
+	 *
+	 *   unmap_all_regions_except_kernel();
+	 *   for_each_node_in_reverse_order(node) {
+	 *     map_node(node);
+	 *     allocate_bootmem_map(node);
+	 *     init_bootmem_node(node);
+	 *     free_bootmem_node(node);
+	 *   }
+	 *
+	 * but this is a 2.5-type change.  For now, we just set
+	 * the nodes up in reverse order.
+	 *
+	 * (we could also do with rolling bootmem_init and paging_init
+	 * into one generic "memory_init" type function).
+	 */
+	np += num_online_nodes() - 1;
+	for (node = num_online_nodes() - 1; node >= 0; node--, np--) {
+		/*
+		 * If there are no pages in this node, ignore it.
+		 * Note that node 0 must always have some pages.
+		 */
+		if (np->end == 0 || !node_online(node)) {
+			if (node == 0)
+				BUG();
+			continue;
+		}
+
+		/*
+		 * Initialise the bootmem allocator.
+		 */
+		init_bootmem_node(NODE_DATA(node), map_pg, np->start, np->end);
+		free_bootmem_node_bank(node, mi);
+		map_pg += np->bootmap_pages;
+
+		/*
+		 * If this is node 0, we need to reserve some areas ASAP -
+		 * we may use bootmem on node 0 to setup the other nodes.
+		 */
+		if (node == 0)
+			reserve_node_zero(bootmap_pfn, bootmap_pages);
+	}
+
+
+#ifdef CONFIG_BLK_DEV_INITRD
+	if (phys_initrd_size && initrd_node >= 0) {
+		reserve_bootmem_node(NODE_DATA(initrd_node), phys_initrd_start,
+				     phys_initrd_size);
+		initrd_start = __phys_to_virt(phys_initrd_start);
+		initrd_end = initrd_start + phys_initrd_size;
+	}
+#endif
+
+	BUG_ON(map_pg != bootmap_pfn + bootmap_pages);
+}
+
+/*
+ * paging_init() sets up the page tables, initialises the zone memory
+ * maps, and sets up the zero page, bad page and bad page tables.
+ */
+void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc)
+{
+	void *zero_page;
+	int node;
+
+	bootmem_init(mi);
+
+	memcpy(&meminfo, mi, sizeof(meminfo));
+
+	/*
+	 * allocate the zero page.  Note that we count on this going ok.
+	 */
+	zero_page = alloc_bootmem_low_pages(PAGE_SIZE);
+
+	/*
+	 * initialise the page tables.
+	 */
+	memtable_init(mi);
+	if (mdesc->map_io)
+		mdesc->map_io();
+	flush_tlb_all();
+
+	/*
+	 * initialise the zones within each node
+	 */
+	for_each_online_node(node) {
+		unsigned long zone_size[MAX_NR_ZONES];
+		unsigned long zhole_size[MAX_NR_ZONES];
+		struct bootmem_data *bdata;
+		pg_data_t *pgdat;
+		int i;
+
+		/*
+		 * Initialise the zone size information.
+		 */
+		for (i = 0; i < MAX_NR_ZONES; i++) {
+			zone_size[i]  = 0;
+			zhole_size[i] = 0;
+		}
+
+		pgdat = NODE_DATA(node);
+		bdata = pgdat->bdata;
+
+		/*
+		 * The size of this node has already been determined.
+		 * If we need to do anything fancy with the allocation
+		 * of this memory to the zones, now is the time to do
+		 * it.
+		 */
+		zone_size[0] = bdata->node_low_pfn -
+				(bdata->node_boot_start >> PAGE_SHIFT);
+
+		/*
+		 * If this zone has zero size, skip it.
+		 */
+		if (!zone_size[0])
+			continue;
+
+		/*
+		 * For each bank in this node, calculate the size of the
+		 * holes.  holes = node_size - sum(bank_sizes_in_node)
+		 */
+		zhole_size[0] = zone_size[0];
+		for (i = 0; i < mi->nr_banks; i++) {
+			if (mi->bank[i].node != node)
+				continue;
+
+			zhole_size[0] -= mi->bank[i].size >> PAGE_SHIFT;
+		}
+
+		/*
+		 * Adjust the sizes according to any special
+		 * requirements for this machine type.
+		 */
+		arch_adjust_zones(node, zone_size, zhole_size);
+
+		free_area_init_node(node, pgdat, zone_size,
+				bdata->node_boot_start >> PAGE_SHIFT, zhole_size);
+	}
+
+	/*
+	 * finish off the bad pages once
+	 * the mem_map is initialised
+	 */
+	memzero(zero_page, PAGE_SIZE);
+	empty_zero_page = virt_to_page(zero_page);
+	flush_dcache_page(empty_zero_page);
+}
+
+static inline void free_area(unsigned long addr, unsigned long end, char *s)
+{
+	unsigned int size = (end - addr) >> 10;
+
+	for (; addr < end; addr += PAGE_SIZE) {
+		struct page *page = virt_to_page(addr);
+		ClearPageReserved(page);
+		set_page_count(page, 1);
+		free_page(addr);
+		totalram_pages++;
+	}
+
+	if (size && s)
+		printk(KERN_INFO "Freeing %s memory: %dK\n", s, size);
+}
+
+/*
+ * mem_init() marks the free areas in the mem_map and tells us how much
+ * memory is free.  This is done after various parts of the system have
+ * claimed their memory after the kernel image.
+ */
+void __init mem_init(void)
+{
+	unsigned int codepages, datapages, initpages;
+	int i, node;
+
+	codepages = &_etext - &_text;
+	datapages = &_end - &__data_start;
+	initpages = &__init_end - &__init_begin;
+
+#ifndef CONFIG_DISCONTIGMEM
+	max_mapnr   = virt_to_page(high_memory) - mem_map;
+#endif
+
+	/*
+	 * We may have non-contiguous memory.
+	 */
+	if (meminfo.nr_banks != 1)
+		create_memmap_holes(&meminfo);
+
+	/* this will put all unused low memory onto the freelists */
+	for_each_online_node(node) {
+		pg_data_t *pgdat = NODE_DATA(node);
+
+		if (pgdat->node_spanned_pages != 0)
+			totalram_pages += free_all_bootmem_node(pgdat);
+	}
+
+#ifdef CONFIG_SA1111
+	/* now that our DMA memory is actually so designated, we can free it */
+	free_area(PAGE_OFFSET, (unsigned long)swapper_pg_dir, NULL);
+#endif
+
+	/*
+	 * Since our memory may not be contiguous, calculate the
+	 * real number of pages we have in this system
+	 */
+	printk(KERN_INFO "Memory:");
+
+	num_physpages = 0;
+	for (i = 0; i < meminfo.nr_banks; i++) {
+		num_physpages += meminfo.bank[i].size >> PAGE_SHIFT;
+		printk(" %ldMB", meminfo.bank[i].size >> 20);
+	}
+
+	printk(" = %luMB total\n", num_physpages >> (20 - PAGE_SHIFT));
+	printk(KERN_NOTICE "Memory: %luKB available (%dK code, "
+		"%dK data, %dK init)\n",
+		(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
+		codepages >> 10, datapages >> 10, initpages >> 10);
+
+	if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
+		extern int sysctl_overcommit_memory;
+		/*
+		 * On a machine this small we won't get
+		 * anywhere without overcommit, so turn
+		 * it on by default.
+		 */
+		sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
+	}
+}
+
+void free_initmem(void)
+{
+	if (!machine_is_integrator() && !machine_is_cintegrator()) {
+		free_area((unsigned long)(&__init_begin),
+			  (unsigned long)(&__init_end),
+			  "init");
+	}
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+
+static int keep_initrd;
+
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+	if (!keep_initrd)
+		free_area(start, end, "initrd");
+}
+
+static int __init keepinitrd_setup(char *__unused)
+{
+	keep_initrd = 1;
+	return 1;
+}
+
+__setup("keepinitrd", keepinitrd_setup);
+#endif