Initial import

1 files changed, 157 insertions, 0 deletions

diff --git a/arch/frv/mm/init.c b/arch/frv/mm/init.c
new file mode 100644
index 000000000..88a159743
--- /dev/null
+++ b/arch/frv/mm/init.c
@@ -0,0 +1,157 @@
+/* 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/signal.h>
+#include <linux/sched.h>
+#include <linux/pagemap.h>
+#include <linux/gfp.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 <linux/module.h>
+
+#include <asm/setup.h>
+#include <asm/segment.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/mmu_context.h>
+#include <asm/virtconvert.h>
+#include <asm/sections.h>
+#include <asm/tlb.h>
+
+#undef DEBUG
+
+/*
+ * 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;
+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)
+{
+	unsigned long zones_size[MAX_NR_ZONES] = {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);
+
+#ifdef CONFIG_HIGHMEM
+	if (get_num_physpages() - num_mappedpages) {
+		pgd_t *pge;
+		pud_t *pue;
+		pmd_t *pme;
+
+		pkmap_page_table = alloc_bootmem_pages(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_NORMAL]  = max_low_pfn - min_low_pfn;
+#ifdef CONFIG_HIGHMEM
+	zones_size[ZONE_HIGHMEM] = get_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 code_size = _etext - _stext;
+
+	/* this will put all low memory onto the freelists */
+	free_all_bootmem();
+#if defined(CONFIG_MMU) && defined(CONFIG_HIGHMEM)
+	{
+		unsigned long pfn;
+
+		for (pfn = get_num_physpages() - 1;
+		     pfn >= num_mappedpages; pfn--)
+			free_highmem_page(&mem_map[pfn]);
+	}
+#endif
+
+	mem_init_print_info(NULL);
+	if (rom_length > 0 && rom_length >= code_size)
+		printk("Memory available:  %luKiB/%luKiB ROM\n",
+			(rom_length - code_size) >> 10, rom_length >> 10);
+} /* end mem_init() */
+
+/*****************************************************************************/
+/*
+ * free the memory that was only required for initialisation
+ */
+void free_initmem(void)
+{
+#if defined(CONFIG_RAMKERNEL) && !defined(CONFIG_PROTECT_KERNEL)
+	free_initmem_default(-1);
+#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)
+{
+	free_reserved_area((void *)start, (void *)end, -1, "initrd");
+} /* end free_initrd_mem() */
+#endif