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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/frv/mm/init.c
downloadlinux-stericsson-2.6.12-rc2.tar.gz
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!
Diffstat (limited to 'arch/frv/mm/init.c')
-rw-r--r--arch/frv/mm/init.c241
1 files changed, 241 insertions, 0 deletions
diff --git a/arch/frv/mm/init.c b/arch/frv/mm/init.c
new file mode 100644
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+/* init.c: memory initialisation for FRV
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Derived from:
+ * - linux/arch/m68knommu/mm/init.c
+ * - Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>, Kenneth Albanowski <kjahds@kjahds.com>,
+ * - Copyright (C) 2000 Lineo, Inc. (www.lineo.com)
+ * - linux/arch/m68k/mm/init.c
+ * - Copyright (C) 1995 Hamish Macdonald
+ */
+
+#include <linux/config.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/pagemap.h>
+#include <linux/swap.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/bootmem.h>
+#include <linux/highmem.h>
+
+#include <asm/setup.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/mmu_context.h>
+#include <asm/virtconvert.h>
+#include <asm/sections.h>
+#include <asm/tlb.h>
+
+#undef DEBUG
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+/*
+ * BAD_PAGE is the page that is used for page faults when linux
+ * is out-of-memory. Older versions of linux just did a
+ * do_exit(), but using this instead means there is less risk
+ * for a process dying in kernel mode, possibly leaving a inode
+ * unused etc..
+ *
+ * BAD_PAGETABLE is the accompanying page-table: it is initialized
+ * to point to BAD_PAGE entries.
+ *
+ * ZERO_PAGE is a special page that is used for zero-initialized
+ * data and COW.
+ */
+static unsigned long empty_bad_page_table;
+static unsigned long empty_bad_page;
+unsigned long empty_zero_page;
+
+/*****************************************************************************/
+/*
+ *
+ */
+void show_mem(void)
+{
+ unsigned long i;
+ int free = 0, total = 0, reserved = 0, shared = 0;
+
+ printk("\nMem-info:\n");
+ show_free_areas();
+ i = max_mapnr;
+ while (i-- > 0) {
+ struct page *page = &mem_map[i];
+
+ total++;
+ if (PageReserved(page))
+ reserved++;
+ else if (!page_count(page))
+ free++;
+ else
+ shared += page_count(page) - 1;
+ }
+
+ printk("%d pages of RAM\n",total);
+ printk("%d free pages\n",free);
+ printk("%d reserved pages\n",reserved);
+ printk("%d pages shared\n",shared);
+
+} /* end show_mem() */
+
+/*****************************************************************************/
+/*
+ * paging_init() continues the virtual memory environment setup which
+ * was begun by the code in arch/head.S.
+ * The parameters are pointers to where to stick the starting and ending
+ * addresses of available kernel virtual memory.
+ */
+void __init paging_init(void)
+{
+ unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
+
+ /* allocate some pages for kernel housekeeping tasks */
+ empty_bad_page_table = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
+ empty_bad_page = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
+ empty_zero_page = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
+
+ memset((void *) empty_zero_page, 0, PAGE_SIZE);
+
+#if CONFIG_HIGHMEM
+ if (num_physpages - num_mappedpages) {
+ pgd_t *pge;
+ pud_t *pue;
+ pmd_t *pme;
+
+ pkmap_page_table = alloc_bootmem_pages(PAGE_SIZE);
+
+ memset(pkmap_page_table, 0, PAGE_SIZE);
+
+ pge = swapper_pg_dir + pgd_index_k(PKMAP_BASE);
+ pue = pud_offset(pge, PKMAP_BASE);
+ pme = pmd_offset(pue, PKMAP_BASE);
+ __set_pmd(pme, virt_to_phys(pkmap_page_table) | _PAGE_TABLE);
+ }
+#endif
+
+ /* distribute the allocatable pages across the various zones and pass them to the allocator
+ */
+ zones_size[ZONE_DMA] = max_low_pfn - min_low_pfn;
+ zones_size[ZONE_NORMAL] = 0;
+#ifdef CONFIG_HIGHMEM
+ zones_size[ZONE_HIGHMEM] = num_physpages - num_mappedpages;
+#endif
+
+ free_area_init(zones_size);
+
+#ifdef CONFIG_MMU
+ /* initialise init's MMU context */
+ init_new_context(&init_task, &init_mm);
+#endif
+
+} /* end paging_init() */
+
+/*****************************************************************************/
+/*
+ *
+ */
+void __init mem_init(void)
+{
+ unsigned long npages = (memory_end - memory_start) >> PAGE_SHIFT;
+ unsigned long tmp;
+#ifdef CONFIG_MMU
+ unsigned long loop, pfn;
+ int datapages = 0;
+#endif
+ int codek = 0, datak = 0;
+
+ /* this will put all memory onto the freelists */
+ totalram_pages = free_all_bootmem();
+
+#ifdef CONFIG_MMU
+ for (loop = 0 ; loop < npages ; loop++)
+ if (PageReserved(&mem_map[loop]))
+ datapages++;
+
+#ifdef CONFIG_HIGHMEM
+ for (pfn = num_physpages - 1; pfn >= num_mappedpages; pfn--) {
+ struct page *page = &mem_map[pfn];
+
+ ClearPageReserved(page);
+ set_bit(PG_highmem, &page->flags);
+ set_page_count(page, 1);
+ __free_page(page);
+ totalram_pages++;
+ }
+#endif
+
+ codek = ((unsigned long) &_etext - (unsigned long) &_stext) >> 10;
+ datak = datapages << (PAGE_SHIFT - 10);
+
+#else
+ codek = (_etext - _stext) >> 10;
+ datak = 0; //(_ebss - _sdata) >> 10;
+#endif
+
+ tmp = nr_free_pages() << PAGE_SHIFT;
+ printk("Memory available: %luKiB/%luKiB RAM, %luKiB/%luKiB ROM (%dKiB kernel code, %dKiB data)\n",
+ tmp >> 10,
+ npages << (PAGE_SHIFT - 10),
+ (rom_length > 0) ? ((rom_length >> 10) - codek) : 0,
+ rom_length >> 10,
+ codek,
+ datak
+ );
+
+} /* end mem_init() */
+
+/*****************************************************************************/
+/*
+ * free the memory that was only required for initialisation
+ */
+void __init free_initmem(void)
+{
+#if defined(CONFIG_RAMKERNEL) && !defined(CONFIG_PROTECT_KERNEL)
+ unsigned long start, end, addr;
+
+ start = PAGE_ALIGN((unsigned long) &__init_begin); /* round up */
+ end = ((unsigned long) &__init_end) & PAGE_MASK; /* round down */
+
+ /* next to check that the page we free is not a partial page */
+ for (addr = start; addr < end; addr += PAGE_SIZE) {
+ ClearPageReserved(virt_to_page(addr));
+ set_page_count(virt_to_page(addr), 1);
+ free_page(addr);
+ totalram_pages++;
+ }
+
+ printk("Freeing unused kernel memory: %ldKiB freed (0x%lx - 0x%lx)\n",
+ (end - start) >> 10, start, end);
+#endif
+} /* end free_initmem() */
+
+/*****************************************************************************/
+/*
+ * free the initial ramdisk memory
+ */
+#ifdef CONFIG_BLK_DEV_INITRD
+void __init free_initrd_mem(unsigned long start, unsigned long end)
+{
+ int pages = 0;
+ for (; start < end; start += PAGE_SIZE) {
+ ClearPageReserved(virt_to_page(start));
+ set_page_count(virt_to_page(start), 1);
+ free_page(start);
+ totalram_pages++;
+ pages++;
+ }
+ printk("Freeing initrd memory: %dKiB freed\n", (pages * PAGE_SIZE) >> 10);
+} /* end free_initrd_mem() */
+#endif