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
index 000000000000..41958f57c838
--- /dev/null
+++ b/arch/frv/mm/init.c
@@ -0,0 +1,241 @@
+/* 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