-/* $Id: init.c,v 1.19 2004/02/21 04:42:16 kkojima Exp $
- *
- * linux/arch/sh/mm/init.c
+/*
+ * linux/arch/sh/mm/init.c
*
* Copyright (C) 1999 Niibe Yutaka
- * Copyright (C) 2002, 2004 Paul Mundt
+ * Copyright (C) 2002 - 2007 Paul Mundt
*
* Based on linux/arch/i386/mm/init.c:
* Copyright (C) 1995 Linus Torvalds
*/
-
-#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/mman.h>
#include <linux/mm.h>
#include <linux/swap.h>
-#include <linux/smp.h>
#include <linux/init.h>
-#include <linux/highmem.h>
#include <linux/bootmem.h>
-#include <linux/pagemap.h>
#include <linux/proc_fs.h>
-#include <asm/processor.h>
-#include <asm/system.h>
-#include <asm/uaccess.h>
-#include <asm/pgtable.h>
-#include <asm/pgalloc.h>
+#include <linux/pagemap.h>
+#include <linux/percpu.h>
+#include <linux/io.h>
#include <asm/mmu_context.h>
-#include <asm/io.h>
#include <asm/tlb.h>
#include <asm/cacheflush.h>
+#include <asm/sections.h>
#include <asm/cache.h>
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
pgd_t swapper_pg_dir[PTRS_PER_PGD];
-
-#ifdef CONFIG_MMU
-/* It'd be good if these lines were in the standard header file. */
-#define START_PFN (NODE_DATA(0)->bdata->node_boot_start >> PAGE_SHIFT)
-#define MAX_LOW_PFN (NODE_DATA(0)->bdata->node_low_pfn)
-#endif
-
-void (*copy_page)(void *from, void *to);
-void (*clear_page)(void *to);
+unsigned long cached_to_uncached = 0;
void show_mem(void)
{
- int i, total = 0, reserved = 0;
- int shared = 0, cached = 0;
+ int total = 0, reserved = 0, free = 0;
+ int shared = 0, cached = 0, slab = 0;
+ pg_data_t *pgdat;
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))
- shared += page_count(mem_map+i) - 1;
+
+ for_each_online_pgdat(pgdat) {
+ unsigned long flags, i;
+
+ pgdat_resize_lock(pgdat, &flags);
+ for (i = 0; i < pgdat->node_spanned_pages; i++) {
+ struct page *page = pgdat_page_nr(pgdat, i);
+ 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;
+ }
+ pgdat_resize_unlock(pgdat, &flags);
}
- 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("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
+ 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);
+ printk(KERN_INFO "Total of %ld pages in page table cache\n",
+ quicklist_total_size());
}
#ifdef CONFIG_MMU
set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
- flush_tlb_one(get_asid(), addr);
+ if (cached_to_uncached)
+ flush_tlb_one(get_asid(), addr);
}
/*
* As a performance optimization, other platforms preserve the fixmap mapping
* across a context switch, we don't presently do this, but this could be done
* in a similar fashion as to the wired TLB interface that sh64 uses (by way
- * of the memorry mapped UTLB configuration) -- this unfortunately forces us to
+ * of the memory mapped UTLB configuration) -- this unfortunately forces us to
* give up a TLB entry for each mapping we want to preserve. While this may be
* viable for a small number of fixmaps, it's not particularly useful for
* everything and needs to be carefully evaluated. (ie, we may want this for
set_pte_phys(address, phys, prot);
}
-#endif /* CONFIG_MMU */
-/* References to section boundaries */
-
-extern char _text, _etext, _edata, __bss_start, _end;
-extern char __init_begin, __init_end;
+void __init page_table_range_init(unsigned long start, unsigned long end,
+ pgd_t *pgd_base)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ int pgd_idx;
+ unsigned long vaddr;
+
+ vaddr = start & PMD_MASK;
+ end = (end + PMD_SIZE - 1) & PMD_MASK;
+ pgd_idx = pgd_index(vaddr);
+ pgd = pgd_base + pgd_idx;
+
+ for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) {
+ BUG_ON(pgd_none(*pgd));
+ pud = pud_offset(pgd, 0);
+ BUG_ON(pud_none(*pud));
+ pmd = pmd_offset(pud, 0);
+
+ if (!pmd_present(*pmd)) {
+ pte_t *pte_table;
+ pte_table = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
+ memset(pte_table, 0, PAGE_SIZE);
+ pmd_populate_kernel(&init_mm, pmd, pte_table);
+ }
+
+ vaddr += PMD_SIZE;
+ }
+}
+#endif /* CONFIG_MMU */
/*
* paging_init() sets up the page tables
*/
void __init paging_init(void)
{
- unsigned long zones_size[MAX_NR_ZONES] = { 0, };
-
- /*
- * Setup some defaults for the zone sizes.. these should be safe
- * regardless of distcontiguous memory or MMU settings.
- */
- zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
-#ifdef CONFIG_HIGHMEM
- zones_size[ZONE_HIGHMEM] = 0 >> PAGE_SHIFT;
-#endif
+ unsigned long max_zone_pfns[MAX_NR_ZONES];
+ int nid;
-#ifdef CONFIG_MMU
- /*
- * If we have an MMU, and want to be using it .. we need to adjust
- * the zone sizes accordingly, in addition to turning it on.
- */
- {
- /* We don't need to map the kernel through the TLB, as
- * it is permanatly mapped using P1. So clear the
- * entire pgd. */
- memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
-
- /* Turn on the MMU */
- enable_mmu();
- zones_size[ZONE_NORMAL] = MAX_LOW_PFN - START_PFN;
- }
+ /* We don't need to map the kernel through the TLB, as
+ * it is permanatly mapped using P1. So clear the
+ * entire pgd. */
+ memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
/* Set an initial value for the MMU.TTB so we don't have to
* check for a null value. */
set_TTB(swapper_pg_dir);
-#elif defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4)
+ /* Populate the relevant portions of swapper_pg_dir so that
+ * we can use the fixmap entries without calling kmalloc.
+ * pte's will be filled in by __set_fixmap(). */
+ page_table_range_init(FIXADDR_START, FIXADDR_TOP, swapper_pg_dir);
+
+ memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
+
+ for_each_online_node(nid) {
+ pg_data_t *pgdat = NODE_DATA(nid);
+ unsigned long low, start_pfn;
+
+ start_pfn = pgdat->bdata->node_boot_start >> PAGE_SHIFT;
+ low = pgdat->bdata->node_low_pfn;
+
+ if (max_zone_pfns[ZONE_NORMAL] < low)
+ max_zone_pfns[ZONE_NORMAL] = low;
+
+ printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
+ nid, start_pfn, low);
+ }
+
+ free_area_init_nodes(max_zone_pfns);
+
+#ifdef CONFIG_SUPERH32
+ /* Set up the uncached fixmap */
+ set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start));
+
+#ifdef CONFIG_29BIT
/*
- * If we don't have CONFIG_MMU set and the processor in question
- * still has an MMU, care needs to be taken to make sure it doesn't
- * stay on.. Since the boot loader could have potentially already
- * turned it on, and we clearly don't want it, we simply turn it off.
- *
- * We don't need to do anything special for the zone sizes, since the
- * default values that were already configured up above should be
- * satisfactory.
+ * Handle trivial transitions between cached and uncached
+ * segments, making use of the 1:1 mapping relationship in
+ * 512MB lowmem.
*/
- disable_mmu();
+ cached_to_uncached = P2SEG - P1SEG;
+#endif
#endif
- NODE_DATA(0)->node_mem_map = NULL;
- free_area_init_node(0, NODE_DATA(0), zones_size, __MEMORY_START >> PAGE_SHIFT, 0);
}
static struct kcore_list kcore_mem, kcore_vmalloc;
+int after_bootmem = 0;
void __init mem_init(void)
{
- int codesize, reservedpages, datasize, initsize;
- int tmp;
- extern unsigned long memory_start;
+ int codesize, datasize, initsize;
+ int nid;
-#ifdef CONFIG_MMU
- high_memory = (void *)__va(MAX_LOW_PFN * PAGE_SIZE);
-#else
- extern unsigned long memory_end;
+ num_physpages = 0;
+ high_memory = NULL;
- high_memory = (void *)(memory_end & PAGE_MASK);
-#endif
+ for_each_online_node(nid) {
+ pg_data_t *pgdat = NODE_DATA(nid);
+ unsigned long node_pages = 0;
+ void *node_high_memory;
+
+ num_physpages += pgdat->node_present_pages;
+
+ if (pgdat->node_spanned_pages)
+ node_pages = free_all_bootmem_node(pgdat);
- max_mapnr = num_physpages = MAP_NR(high_memory) - MAP_NR(memory_start);
+ totalram_pages += node_pages;
+
+ node_high_memory = (void *)__va((pgdat->node_start_pfn +
+ pgdat->node_spanned_pages) <<
+ PAGE_SHIFT);
+ if (node_high_memory > high_memory)
+ high_memory = node_high_memory;
+ }
/* clear the zero-page */
memset(empty_zero_page, 0, PAGE_SIZE);
__flush_wback_region(empty_zero_page, PAGE_SIZE);
- /*
- * Setup wrappers for copy/clear_page(), these will get overridden
- * later in the boot process if a better method is available.
- */
-#ifdef CONFIG_MMU
- copy_page = copy_page_slow;
- clear_page = clear_page_slow;
-#else
- copy_page = copy_page_nommu;
- clear_page = clear_page_nommu;
-#endif
-
- /* this will put all low memory onto the freelists */
- totalram_pages += free_all_bootmem_node(NODE_DATA(0));
- reservedpages = 0;
- for (tmp = 0; tmp < num_physpages; tmp++)
- /*
- * Only count reserved RAM pages
- */
- if (PageReserved(mem_map+tmp))
- reservedpages++;
+ after_bootmem = 1;
codesize = (unsigned long) &_etext - (unsigned long) &_text;
datasize = (unsigned long) &_edata - (unsigned long) &_etext;
VMALLOC_END - VMALLOC_START);
printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
- "%dk reserved, %dk data, %dk init)\n",
+ "%dk data, %dk init)\n",
(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
- max_mapnr << (PAGE_SHIFT-10),
+ num_physpages << (PAGE_SHIFT-10),
codesize >> 10,
- reservedpages << (PAGE_SHIFT-10),
datasize >> 10,
initsize >> 10);
free_page(addr);
totalram_pages++;
}
- printk ("Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10);
+ printk("Freeing unused kernel memory: %ldk freed\n",
+ ((unsigned long)&__init_end -
+ (unsigned long)&__init_begin) >> 10);
}
#ifdef CONFIG_BLK_DEV_INITRD
free_page(p);
totalram_pages++;
}
- printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
+ printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
}
#endif
+#ifdef CONFIG_MEMORY_HOTPLUG
+void online_page(struct page *page)
+{
+ ClearPageReserved(page);
+ init_page_count(page);
+ __free_page(page);
+ totalram_pages++;
+ num_physpages++;
+}
+
+int arch_add_memory(int nid, u64 start, u64 size)
+{
+ pg_data_t *pgdat;
+ unsigned long start_pfn = start >> PAGE_SHIFT;
+ unsigned long nr_pages = size >> PAGE_SHIFT;
+ int ret;
+
+ pgdat = NODE_DATA(nid);
+
+ /* We only have ZONE_NORMAL, so this is easy.. */
+ ret = __add_pages(pgdat->node_zones + ZONE_NORMAL, start_pfn, nr_pages);
+ if (unlikely(ret))
+ printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(arch_add_memory);
+
+#ifdef CONFIG_NUMA
+int memory_add_physaddr_to_nid(u64 addr)
+{
+ /* Node 0 for now.. */
+ return 0;
+}
+EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
+#endif
+#endif
projects / linux-2.6-omap-h63xx.git / blobdiff