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-rw-r--r--kernel/arch/arc/mm/init.c155
1 files changed, 155 insertions, 0 deletions
diff --git a/kernel/arch/arc/mm/init.c b/kernel/arch/arc/mm/init.c
new file mode 100644
index 000000000..d44eedd8c
--- /dev/null
+++ b/kernel/arch/arc/mm/init.c
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.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/kernel.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/memblock.h>
+#ifdef CONFIG_BLK_DEV_INITRD
+#include <linux/initrd.h>
+#endif
+#include <linux/swap.h>
+#include <linux/module.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/sections.h>
+#include <asm/arcregs.h>
+
+pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE);
+char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE);
+EXPORT_SYMBOL(empty_zero_page);
+
+/* Default tot mem from .config */
+static unsigned long arc_mem_sz = 0x20000000; /* some default */
+
+/* User can over-ride above with "mem=nnn[KkMm]" in cmdline */
+static int __init setup_mem_sz(char *str)
+{
+ arc_mem_sz = memparse(str, NULL) & PAGE_MASK;
+
+ /* early console might not be setup yet - it will show up later */
+ pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(arc_mem_sz));
+
+ return 0;
+}
+early_param("mem", setup_mem_sz);
+
+void __init early_init_dt_add_memory_arch(u64 base, u64 size)
+{
+ arc_mem_sz = size & PAGE_MASK;
+ pr_info("Memory size set via devicetree %ldM\n", TO_MB(arc_mem_sz));
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+static int __init early_initrd(char *p)
+{
+ unsigned long start, size;
+ char *endp;
+
+ start = memparse(p, &endp);
+ if (*endp == ',') {
+ size = memparse(endp + 1, NULL);
+
+ initrd_start = (unsigned long)__va(start);
+ initrd_end = (unsigned long)__va(start + size);
+ }
+ return 0;
+}
+early_param("initrd", early_initrd);
+#endif
+
+/*
+ * First memory setup routine called from setup_arch()
+ * 1. setup swapper's mm @init_mm
+ * 2. Count the pages we have and setup bootmem allocator
+ * 3. zone setup
+ */
+void __init setup_arch_memory(void)
+{
+ unsigned long zones_size[MAX_NR_ZONES];
+ unsigned long end_mem = CONFIG_LINUX_LINK_BASE + arc_mem_sz;
+
+ init_mm.start_code = (unsigned long)_text;
+ init_mm.end_code = (unsigned long)_etext;
+ init_mm.end_data = (unsigned long)_edata;
+ init_mm.brk = (unsigned long)_end;
+
+ /*
+ * We do it here, so that memory is correctly instantiated
+ * even if "mem=xxx" cmline over-ride is given and/or
+ * DT has memory node. Each causes an update to @arc_mem_sz
+ * and we finally add memory one here
+ */
+ memblock_add(CONFIG_LINUX_LINK_BASE, arc_mem_sz);
+
+ /*------------- externs in mm need setting up ---------------*/
+
+ /* first page of system - kernel .vector starts here */
+ min_low_pfn = ARCH_PFN_OFFSET;
+
+ /* Last usable page of low mem (no HIGHMEM yet for ARC port) */
+ max_low_pfn = max_pfn = PFN_DOWN(end_mem);
+
+ max_mapnr = max_low_pfn - min_low_pfn;
+
+ /*------------- reserve kernel image -----------------------*/
+ memblock_reserve(CONFIG_LINUX_LINK_BASE,
+ __pa(_end) - CONFIG_LINUX_LINK_BASE);
+
+#ifdef CONFIG_BLK_DEV_INITRD
+ /*------------- reserve initrd image -----------------------*/
+ if (initrd_start)
+ memblock_reserve(__pa(initrd_start), initrd_end - initrd_start);
+#endif
+
+ memblock_dump_all();
+
+ /*-------------- node setup --------------------------------*/
+ memset(zones_size, 0, sizeof(zones_size));
+ zones_size[ZONE_NORMAL] = max_mapnr;
+
+ /*
+ * We can't use the helper free_area_init(zones[]) because it uses
+ * PAGE_OFFSET to compute the @min_low_pfn which would be wrong
+ * when our kernel doesn't start at PAGE_OFFSET, i.e.
+ * PAGE_OFFSET != CONFIG_LINUX_LINK_BASE
+ */
+ free_area_init_node(0, /* node-id */
+ zones_size, /* num pages per zone */
+ min_low_pfn, /* first pfn of node */
+ NULL); /* NO holes */
+
+ high_memory = (void *)end_mem;
+}
+
+/*
+ * mem_init - initializes memory
+ *
+ * Frees up bootmem
+ * Calculates and displays memory available/used
+ */
+void __init mem_init(void)
+{
+ free_all_bootmem();
+ mem_init_print_info(NULL);
+}
+
+/*
+ * free_initmem: Free all the __init memory.
+ */
+void __init_refok free_initmem(void)
+{
+ free_initmem_default(-1);
+}
+
+#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");
+}
+#endif