C6X: memory management and DMA support

[sfrench/cifs-2.6.git] / arch / c6x / mm / init.c

diff --git a/arch/c6x/mm/init.c b/arch/c6x/mm/init.c
new file mode 100644 (file)
index 0000000..89395f0
--- /dev/null
+++ b/arch/c6x/mm/init.c
@@ -0,0 +1,113 @@
+/*
+ *  Port on Texas Instruments TMS320C6x architecture
+ *
+ *  Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
+ *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ */
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/module.h>
+#include <linux/bootmem.h>
+#ifdef CONFIG_BLK_DEV_RAM
+#include <linux/blkdev.h>
+#endif
+#include <linux/initrd.h>
+
+#include <asm/sections.h>
+
+/*
+ * ZERO_PAGE is a special page that is used for zero-initialized
+ * data and COW.
+ */
+unsigned long empty_zero_page;
+EXPORT_SYMBOL(empty_zero_page);
+
+/*
+ * 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)
+{
+       struct pglist_data *pgdat = NODE_DATA(0);
+       unsigned long zones_size[MAX_NR_ZONES] = {0, };
+
+       empty_zero_page      = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
+       memset((void *)empty_zero_page, 0, PAGE_SIZE);
+
+       /*
+        * Set up user data space
+        */
+       set_fs(KERNEL_DS);
+
+       /*
+        * Define zones
+        */
+       zones_size[ZONE_NORMAL] = (memory_end - PAGE_OFFSET) >> PAGE_SHIFT;
+       pgdat->node_zones[ZONE_NORMAL].zone_start_pfn =
+               __pa(PAGE_OFFSET) >> PAGE_SHIFT;
+
+       free_area_init(zones_size);
+}
+
+void __init mem_init(void)
+{
+       int codek, datak;
+       unsigned long tmp;
+       unsigned long len = memory_end - memory_start;
+
+       high_memory = (void *)(memory_end & PAGE_MASK);
+
+       /* this will put all memory onto the freelists */
+       totalram_pages = free_all_bootmem();
+
+       codek = (_etext - _stext) >> 10;
+       datak = (_end - _sdata) >> 10;
+
+       tmp = nr_free_pages() << PAGE_SHIFT;
+       printk(KERN_INFO "Memory: %luk/%luk RAM (%dk kernel code, %dk data)\n",
+              tmp >> 10, len >> 10, codek, datak);
+}
+
+#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));
+               init_page_count(virt_to_page(start));
+               free_page(start);
+               totalram_pages++;
+               pages++;
+       }
+       printk(KERN_INFO "Freeing initrd memory: %luk freed\n",
+              (pages * PAGE_SIZE) >> 10);
+}
+#endif
+
+void __init free_initmem(void)
+{
+       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_INFO "Freeing unused kernel memory: %dK freed\n",
+              (int) ((addr - PAGE_ALIGN((long) &__init_begin)) >> 10));
+}