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-rw-r--r--arch/blackfin/mm/init.c208
1 files changed, 208 insertions, 0 deletions
diff --git a/arch/blackfin/mm/init.c b/arch/blackfin/mm/init.c
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+++ b/arch/blackfin/mm/init.c
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+/*
+ * 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
+}