ARC: Boot #1: low-level, setup_arch(), /proc/cpuinfo, mem init

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 171 insertions, 0 deletions

diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
new file mode 100644
index 000000000000..63da3478521f
--- /dev/null
+++ b/arch/arc/mm/init.c
@@ -0,0 +1,171 @@
+/*
+ * 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_BLOCK_DEV_RAM
+#include <linux/blk.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 = CONFIG_ARC_PLAT_SDRAM_SIZE;
+
+/* 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);
+
+/*
+ * 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] = { 0, 0 };
+        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 not given
+         */
+        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 = PFN_DOWN(CONFIG_LINUX_LINK_BASE);
+
+        /* Last usable page of low mem (no HIGHMEM yet for ARC port) */
+        max_low_pfn = max_pfn = PFN_DOWN(end_mem);
+
+        max_mapnr = num_physpages = max_low_pfn - min_low_pfn;
+
+        /*------------- reserve kernel image -----------------------*/
+        memblock_reserve(CONFIG_LINUX_LINK_BASE,
+                         __pa(_end) - CONFIG_LINUX_LINK_BASE);
+
+        memblock_dump_all();
+
+        /*-------------- node setup --------------------------------*/
+        memset(zones_size, 0, sizeof(zones_size));
+        zones_size[ZONE_NORMAL] = num_physpages;
+
+        /*
+         * 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 */
+}
+
+/*
+ * mem_init - initializes memory
+ *
+ * Frees up bootmem
+ * Calculates and displays memory available/used
+ */
+void __init mem_init(void)
+{
+        int codesize, datasize, initsize, reserved_pages, free_pages;
+        int tmp;
+
+        high_memory = (void *)(CONFIG_LINUX_LINK_BASE + arc_mem_sz);
+
+        totalram_pages = free_all_bootmem();
+
+        /* count all reserved pages [kernel code/data/mem_map..] */
+        reserved_pages = 0;
+        for (tmp = 0; tmp < max_mapnr; tmp++)
+                if (PageReserved(mem_map + tmp))
+                        reserved_pages++;
+
+        /* XXX: nr_free_pages() is equivalent */
+        free_pages = max_mapnr - reserved_pages;
+
+        /*
+         * For the purpose of display below, split the "reserve mem"
+         * kernel code/data is already shown explicitly,
+         * Show any other reservations (mem_map[ ] et al)
+         */
+        reserved_pages -= (((unsigned int)_end - CONFIG_LINUX_LINK_BASE) >>
+                                                                PAGE_SHIFT);
+
+        codesize = _etext - _text;
+        datasize = _end - _etext;
+        initsize = __init_end - __init_begin;
+
+        pr_info("Memory Available: %dM / %ldM (%dK code, %dK data, %dK init, %dK reserv)\n",
+                PAGES_TO_MB(free_pages),
+                TO_MB(arc_mem_sz),
+                TO_KB(codesize), TO_KB(datasize), TO_KB(initsize),
+                PAGES_TO_KB(reserved_pages));
+}
+
+static void __init free_init_pages(const char *what, unsigned long begin,
+                                   unsigned long end)
+{
+        unsigned long addr;
+
+        pr_info("Freeing %s: %ldk [%lx] to [%lx]\n",
+                what, TO_KB(end - begin), begin, end);
+
+        /* need to check that the page we free is not a partial page */
+        for (addr = begin; addr + PAGE_SIZE <= end; addr += PAGE_SIZE) {
+                ClearPageReserved(virt_to_page(addr));
+                init_page_count(virt_to_page(addr));
+                free_page(addr);
+                totalram_pages++;
+        }
+}
+
+/*
+ * free_initmem: Free all the __init memory.
+ */
+void __init_refok free_initmem(void)
+{
+        free_init_pages("unused kernel memory",
+                        (unsigned long)__init_begin,
+                        (unsigned long)__init_end);
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void __init free_initrd_mem(unsigned long start, unsigned long end)
+{
+        free_init_pages("initrd memory", start, end);
+}
+#endif