1 files changed, 208 insertions, 0 deletions

diff --git a/arch/blackfin/mm/init.c b/arch/blackfin/mm/init.c
new file mode 100644
index 000000000000..73f72abed432
--- /dev/null
+++ b/arch/blackfin/mm/init.c
@@ -0,0 +1,208 @@
+/*
+ * File:         arch/blackfin/mm/init.c
+ * Based on:
+ * Author:
+ *
+ * Created:
+ * Description:
+ *
+ * Modified:
+ *               Copyright 2004-2006 Analog Devices Inc.
+ *
+ * Bugs:         Enter bugs at http://blackfin.uclinux.org/
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/swap.h>
+#include <linux/bootmem.h>
+#include <asm/bfin-global.h>
+#include <asm/uaccess.h>
+#include <asm/l1layout.h>
+#include "blackfin_sram.h"
+
+/*
+ * 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;
+
+        int cached = 0;
+        printk(KERN_INFO "Mem-info:\n");
+        show_free_areas();
+        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))
+                        free++;
+                else
+                        shared += page_count(mem_map + i) - 1;
+        }
+        printk(KERN_INFO "%d pages of RAM\n", total);
+        printk(KERN_INFO "%d free pages\n", free);
+        printk(KERN_INFO "%d reserved pages\n", reserved);
+        printk(KERN_INFO "%d pages shared\n", shared);
+        printk(KERN_INFO "%d pages swap cached\n", cached);
+}
+
+/*
+ * 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 paging_init(void)
+{
+        /*
+         * make sure start_mem is page aligned,  otherwise bootmem and
+         * page_alloc get different views og the world
+         */
+        unsigned long end_mem = memory_end & PAGE_MASK;
+
+        pr_debug("start_mem is %#lx   virtual_end is %#lx\n", PAGE_ALIGN(memory_start), end_mem);
+
+        /*
+         * initialize the bad page table and bad page to point
+         * to a couple of allocated pages
+         */
+        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);
+
+        /*
+         * Set up SFC/DFC registers (user data space)
+         */
+        set_fs(KERNEL_DS);
+
+        pr_debug("free_area_init -> start_mem is %#lx   virtual_end is %#lx\n",
+                PAGE_ALIGN(memory_start), end_mem);
+
+        {
+                unsigned long zones_size[MAX_NR_ZONES] = { 0, };
+
+                zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
+#ifdef CONFIG_HIGHMEM
+                zones_size[ZONE_HIGHMEM] = 0;
+#endif
+                free_area_init(zones_size);
+        }
+}
+
+void mem_init(void)
+{
+        unsigned int codek = 0, datak = 0, initk = 0;
+        unsigned long tmp;
+        unsigned int len = _ramend - _rambase;
+        unsigned long start_mem = memory_start;
+        unsigned long end_mem = memory_end;
+
+        end_mem &= PAGE_MASK;
+        high_memory = (void *)end_mem;
+
+        start_mem = PAGE_ALIGN(start_mem);
+        max_mapnr = num_physpages = MAP_NR(high_memory);
+        printk(KERN_INFO "Physical pages: %lx\n", num_physpages);
+
+        /* This will put all memory onto the freelists. */
+        totalram_pages = free_all_bootmem();
+
+        codek = (_etext - _stext) >> 10;
+        datak = (__bss_stop - __bss_start) >> 10;
+        initk = (__init_end - __init_begin) >> 10;
+
+        tmp = nr_free_pages() << PAGE_SHIFT;
+        printk(KERN_INFO
+             "Memory available: %luk/%uk RAM, (%uk init code, %uk kernel code, %uk data, %uk dma)\n",
+             tmp >> 10, len >> 10, initk, codek, datak, DMA_UNCACHED_REGION >> 10);
+
+        /* Initialize the blackfin L1 Memory. */
+        l1sram_init();
+        l1_data_sram_init();
+        l1_inst_sram_init();
+
+        /* Allocate this once; never free it.  We assume this gives us a
+           pointer to the start of L1 scratchpad memory; panic if it
+           doesn't.  */
+        tmp = (unsigned long)l1sram_alloc(sizeof(struct l1_scratch_task_info));
+        if (tmp != (unsigned long)L1_SCRATCH_TASK_INFO) {
+                printk(KERN_EMERG "mem_init(): Did not get the right address from l1sram_alloc: %08lx != %08lx\n",
+                        tmp, (unsigned long)L1_SCRATCH_TASK_INFO);
+                panic("No L1, time to give up\n");
+        }
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+        int pages = 0;
+        for (; start < end; start += PAGE_SIZE) {
+                ClearPageReserved(virt_to_page(start));
+                init_page_count(virt_to_page(start));
+                free_page(start);
+                totalram_pages++;
+                pages++;
+        }
+        printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n", pages);
+}
+#endif
+
+void free_initmem(void)
+{
+#ifdef CONFIG_RAMKERNEL
+        unsigned long addr;
+/*
+ *      the following code should be cool even if these sections
+ *      are not page aligned.
+ */
+        addr = PAGE_ALIGN((unsigned long)(__init_begin));
+        /* next to check that the page we free is not a partial page */
+        for (; addr + PAGE_SIZE < (unsigned long)(__init_end);
+             addr += PAGE_SIZE) {
+                ClearPageReserved(virt_to_page(addr));
+                init_page_count(virt_to_page(addr));
+                free_page(addr);
+                totalram_pages++;
+        }
+        printk(KERN_NOTICE
+               "Freeing unused kernel memory: %ldk freed (0x%x - 0x%x)\n",
+               (addr - PAGE_ALIGN((long)__init_begin)) >> 10,
+               (int)(PAGE_ALIGN((unsigned long)(__init_begin))),
+               (int)(addr - PAGE_SIZE));
+#endif
+}