1 files changed, 160 insertions, 0 deletions

diff --git a/arch/mn10300/mm/init.c b/arch/mn10300/mm/init.c
new file mode 100644
index 000000000000..8c5d88c7b90a
--- /dev/null
+++ b/arch/mn10300/mm/init.c
@@ -0,0 +1,160 @@
+/* MN10300 Memory management initialisation
+ *
+ * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Modified 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 Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#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/slab.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/smp.h>
+#include <linux/init.h>
+#include <linux/initrd.h>
+#include <linux/highmem.h>
+#include <linux/pagemap.h>
+#include <linux/bootmem.h>
+
+#include <asm/processor.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/dma.h>
+#include <asm/tlb.h>
+#include <asm/sections.h>
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+unsigned long highstart_pfn, highend_pfn;
+
+/*
+ * set up paging
+ */
+void __init paging_init(void)
+{
+        unsigned long zones_size[MAX_NR_ZONES] = {0,};
+        pte_t *ppte;
+        int loop;
+
+        /* main kernel space -> RAM mapping is handled as 1:1 transparent by
+         * the MMU */
+        memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
+        memset(kernel_vmalloc_ptes, 0, sizeof(kernel_vmalloc_ptes));
+
+        /* load the VMALLOC area PTE table addresses into the kernel PGD */
+        ppte = kernel_vmalloc_ptes;
+        for (loop = VMALLOC_START / (PAGE_SIZE * PTRS_PER_PTE);
+             loop < VMALLOC_END / (PAGE_SIZE * PTRS_PER_PTE);
+             loop++
+             ) {
+                set_pgd(swapper_pg_dir + loop, __pgd(__pa(ppte) | _PAGE_TABLE));
+                ppte += PAGE_SIZE / sizeof(pte_t);
+        }
+
+        /* declare the sizes of the RAM zones (only use the normal zone) */
+        zones_size[ZONE_NORMAL] =
+                (contig_page_data.bdata->node_low_pfn) -
+                (contig_page_data.bdata->node_boot_start >> PAGE_SHIFT);
+
+        /* pass the memory from the bootmem allocator to the main allocator */
+        free_area_init(zones_size);
+
+        __flush_tlb_all();
+}
+
+/*
+ * transfer all the memory from the bootmem allocator to the runtime allocator
+ */
+void __init mem_init(void)
+{
+        int codesize, reservedpages, datasize, initsize;
+        int tmp;
+
+        if (!mem_map)
+                BUG();
+
+#define START_PFN       (contig_page_data.bdata->node_boot_start >> PAGE_SHIFT)
+#define MAX_LOW_PFN     (contig_page_data.bdata->node_low_pfn)
+
+        max_mapnr = num_physpages = MAX_LOW_PFN - START_PFN;
+        high_memory = (void *) __va(MAX_LOW_PFN * PAGE_SIZE);
+
+        /* clear the zero-page */
+        memset(empty_zero_page, 0, PAGE_SIZE);
+
+        /* this will put all low memory onto the freelists */
+        totalram_pages += free_all_bootmem();
+
+        reservedpages = 0;
+        for (tmp = 0; tmp < num_physpages; tmp++)
+                if (PageReserved(&mem_map[tmp]))
+                        reservedpages++;
+
+        codesize =  (unsigned long) &_etext - (unsigned long) &_stext;
+        datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
+        initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
+
+        printk(KERN_INFO
+               "Memory: %luk/%luk available"
+               " (%dk kernel code, %dk reserved, %dk data, %dk init,"
+               " %ldk highmem)\n",
+               (unsigned long) nr_free_pages() << (PAGE_SHIFT - 10),
+               max_mapnr << (PAGE_SHIFT - 10),
+               codesize >> 10,
+               reservedpages << (PAGE_SHIFT - 10),
+               datasize >> 10,
+               initsize >> 10,
+               (unsigned long) (totalhigh_pages << (PAGE_SHIFT - 10))
+               );
+}
+
+/*
+ *
+ */
+void free_init_pages(char *what, unsigned long begin, unsigned long end)
+{
+        unsigned long addr;
+
+        for (addr = begin; addr < end; addr += PAGE_SIZE) {
+                ClearPageReserved(virt_to_page(addr));
+                init_page_count(virt_to_page(addr));
+                memset((void *) addr, 0xcc, PAGE_SIZE);
+                free_page(addr);
+                totalram_pages++;
+        }
+        printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
+}
+
+/*
+ * recycle memory containing stuff only required for initialisation
+ */
+void free_initmem(void)
+{
+        free_init_pages("unused kernel memory",
+                        (unsigned long) &__init_begin,
+                        (unsigned long) &__init_end);
+}
+
+/*
+ * dispose of the memory on which the initial ramdisk resided
+ */
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+        free_init_pages("initrd memory", start, end);
+}
+#endif