score: Add support for Sunplus S+core architecture

[linux-2.6-block.git] / arch / score / mm / init.c

diff --git a/arch/score/mm/init.c b/arch/score/mm/init.c
new file mode 100644 (file)
index 0000000..7780eec
--- /dev/null
+++ b/arch/score/mm/init.c
@@ -0,0 +1,173 @@
+/*
+ * arch/score/mm/init.c
+ *
+ * Score Processor version.
+ *
+ * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
+ *  Lennox Wu <lennox.wu@sunplusct.com>
+ *  Chen Liqin <liqin.chen@sunplusct.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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/errno.h>
+#include <linux/bootmem.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/mman.h>
+#include <linux/pagemap.h>
+#include <linux/proc_fs.h>
+#include <linux/sched.h>
+#include <asm-generic/sections.h>
+
+#include <asm/tlb.h>
+
+DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
+
+/*
+ * We have up to 8 empty zeroed pages so we can map one of the right colour
+ * when needed.
+ */
+unsigned long zero_page_mask;
+unsigned long empty_zero_page;
+EXPORT_SYMBOL_GPL(empty_zero_page);
+
+static struct kcore_list kcore_mem, kcore_vmalloc;
+
+unsigned long setup_zero_pages(void)
+{
+       unsigned int order = 0;
+       unsigned long size;
+       struct page *page;
+
+       empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
+       if (!empty_zero_page)
+               panic("Oh boy, that early out of memory?");
+
+       page = virt_to_page((void *) empty_zero_page);
+       split_page(page, order);
+       while (page < virt_to_page((void *) (empty_zero_page +
+                                            (PAGE_SIZE << order)))) {
+               SetPageReserved(page);
+               page++;
+       }
+
+       size = PAGE_SIZE << order;
+       zero_page_mask = (size - 1) & PAGE_MASK;
+
+       return 1UL << order;
+}
+
+#ifndef CONFIG_NEED_MULTIPLE_NODES
+static int __init page_is_ram(unsigned long pagenr)
+{
+       if (pagenr >= min_low_pfn && pagenr < max_low_pfn)
+               return 1;
+       else
+               return 0;
+}
+
+void __init paging_init(void)
+{
+       unsigned long max_zone_pfns[MAX_NR_ZONES];
+       unsigned long lastpfn;
+
+       pagetable_init();
+       max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+       lastpfn = max_low_pfn;
+       free_area_init_nodes(max_zone_pfns);
+}
+
+void __init mem_init(void)
+{
+       unsigned long codesize, reservedpages, datasize, initsize;
+       unsigned long tmp, ram = 0;
+
+       max_mapnr = max_low_pfn;
+       high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
+       totalram_pages += free_all_bootmem();
+       totalram_pages -= setup_zero_pages();   /* Setup zeroed pages. */
+       reservedpages = 0;
+
+       for (tmp = 0; tmp < max_low_pfn; tmp++)
+               if (page_is_ram(tmp)) {
+                       ram++;
+                       if (PageReserved(pfn_to_page(tmp)))
+                               reservedpages++;
+               }
+
+       num_physpages = ram;
+       codesize = (unsigned long) &_etext - (unsigned long) &_text;
+       datasize = (unsigned long) &_edata - (unsigned long) &_etext;
+       initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
+
+       kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
+       kclist_add(&kcore_vmalloc, (void *) VMALLOC_START,
+                       VMALLOC_END - VMALLOC_START);
+
+       printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
+                       "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
+                       (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
+                       ram << (PAGE_SHIFT-10), codesize >> 10,
+                       reservedpages << (PAGE_SHIFT-10), datasize >> 10,
+                       initsize >> 10,
+                       (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
+}
+#endif /* !CONFIG_NEED_MULTIPLE_NODES */
+
+void free_init_pages(const char *what, unsigned long begin, unsigned long end)
+{
+       unsigned long pfn;
+
+       for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
+               struct page *page = pfn_to_page(pfn);
+               void *addr = phys_to_virt(PFN_PHYS(pfn));
+
+               ClearPageReserved(page);
+               init_page_count(page);
+               memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
+               __free_page(page);
+               totalram_pages++;
+       }
+       printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+       free_init_pages("initrd memory",
+       virt_to_phys((void *) start),
+       virt_to_phys((void *) end));
+}
+#endif
+
+void __init_refok free_initmem(void)
+{
+       free_init_pages("unused kernel memory",
+           (unsigned long)__init_begin, (unsigned long)__init_end);
+}
+
+unsigned long pgd_current;
+
+#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
+
+/*
+ * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
+ * are constants.  So we use the variants from asm-offset.h until that gcc
+ * will officially be retired.
+ */
+pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);