From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/mn10300/mm/init.c | 136 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 arch/mn10300/mm/init.c

(limited to 'arch/mn10300/mm/init.c')

diff --git a/arch/mn10300/mm/init.c b/arch/mn10300/mm/init.c
new file mode 100644
index 000000000..97a1ec0be
--- /dev/null
+++ b/arch/mn10300/mm/init.c
@@ -0,0 +1,136 @@
+/* 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/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 <linux/gfp.h>
+
+#include <asm/processor.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>
+
+unsigned long highstart_pfn, highend_pfn;
+
+#ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
+static struct vm_struct user_iomap_vm;
+#endif
+
+/*
+ * 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_min_pfn;
+
+	/* pass the memory from the bootmem allocator to the main allocator */
+	free_area_init(zones_size);
+
+#ifdef CONFIG_MN10300_HAS_ATOMIC_OPS_UNIT
+	/* The Atomic Operation Unit registers need to be mapped to userspace
+	 * for all processes.  The following uses vm_area_register_early() to
+	 * reserve the first page of the vmalloc area and sets the pte for that
+	 * page.
+	 *
+	 * glibc hardcodes this virtual mapping, so we're pretty much stuck with
+	 * it from now on.
+	 */
+	user_iomap_vm.flags = VM_USERMAP;
+	user_iomap_vm.size = 1 << PAGE_SHIFT;
+	vm_area_register_early(&user_iomap_vm, PAGE_SIZE);
+	ppte = kernel_vmalloc_ptes;
+	set_pte(ppte, pfn_pte(USER_ATOMIC_OPS_PAGE_ADDR >> PAGE_SHIFT,
+			      PAGE_USERIO));
+#endif
+
+	local_flush_tlb_all();
+}
+
+/*
+ * transfer all the memory from the bootmem allocator to the runtime allocator
+ */
+void __init mem_init(void)
+{
+	BUG_ON(!mem_map);
+
+#define START_PFN	(contig_page_data.bdata->node_min_pfn)
+#define MAX_LOW_PFN	(contig_page_data.bdata->node_low_pfn)
+
+	max_mapnr = 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 */
+	free_all_bootmem();
+
+	mem_init_print_info(NULL);
+}
+
+/*
+ * recycle memory containing stuff only required for initialisation
+ */
+void free_initmem(void)
+{
+	free_initmem_default(POISON_FREE_INITMEM);
+}
+
+/*
+ * 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_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
+			   "initrd");
+}
+#endif
-- 
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