1 files changed, 223 insertions, 0 deletions

diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
new file mode 100644
index 000000000000..b0fc822ec29f
--- /dev/null
+++ b/arch/powerpc/mm/init_64.c
@@ -0,0 +1,223 @@
+/*
+ *  PowerPC version
+ *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
+ *
+ *  Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
+ *  and Cort Dougan (PReP) (cort@cs.nmt.edu)
+ *    Copyright (C) 1996 Paul Mackerras
+ *  Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
+ *
+ *  Derived from "arch/i386/mm/init.c"
+ *    Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
+ *
+ *  Dave Engebretsen <engebret@us.ibm.com>
+ *      Rework for PPC64 port.
+ *
+ *  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.
+ *
+ */
+
+#include <linux/config.h>
+#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/mman.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/stddef.h>
+#include <linux/vmalloc.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/bootmem.h>
+#include <linux/highmem.h>
+#include <linux/idr.h>
+#include <linux/nodemask.h>
+#include <linux/module.h>
+
+#include <asm/pgalloc.h>
+#include <asm/page.h>
+#include <asm/prom.h>
+#include <asm/lmb.h>
+#include <asm/rtas.h>
+#include <asm/io.h>
+#include <asm/mmu_context.h>
+#include <asm/pgtable.h>
+#include <asm/mmu.h>
+#include <asm/uaccess.h>
+#include <asm/smp.h>
+#include <asm/machdep.h>
+#include <asm/tlb.h>
+#include <asm/eeh.h>
+#include <asm/processor.h>
+#include <asm/mmzone.h>
+#include <asm/cputable.h>
+#include <asm/ppcdebug.h>
+#include <asm/sections.h>
+#include <asm/system.h>
+#include <asm/iommu.h>
+#include <asm/abs_addr.h>
+#include <asm/vdso.h>
+#include <asm/imalloc.h>
+
+#if PGTABLE_RANGE > USER_VSID_RANGE
+#warning Limited user VSID range means pagetable space is wasted
+#endif
+
+#if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
+#warning TASK_SIZE is smaller than it needs to be.
+#endif
+
+unsigned long klimit = (unsigned long)_end;
+
+/* max amount of RAM to use */
+unsigned long __max_memory;
+
+/* info on what we think the IO hole is */
+unsigned long   io_hole_start;
+unsigned long   io_hole_size;
+
+/*
+ * Do very early mm setup.
+ */
+void __init mm_init_ppc64(void)
+{
+#ifndef CONFIG_PPC_ISERIES
+        unsigned long i;
+#endif
+
+        ppc64_boot_msg(0x100, "MM Init");
+
+        /* This is the story of the IO hole... please, keep seated,
+         * unfortunately, we are out of oxygen masks at the moment.
+         * So we need some rough way to tell where your big IO hole
+         * is. On pmac, it's between 2G and 4G, on POWER3, it's around
+         * that area as well, on POWER4 we don't have one, etc...
+         * We need that as a "hint" when sizing the TCE table on POWER3
+         * So far, the simplest way that seem work well enough for us it
+         * to just assume that the first discontinuity in our physical
+         * RAM layout is the IO hole. That may not be correct in the future
+         * (and isn't on iSeries but then we don't care ;)
+         */
+
+#ifndef CONFIG_PPC_ISERIES
+        for (i = 1; i < lmb.memory.cnt; i++) {
+                unsigned long base, prevbase, prevsize;
+
+                prevbase = lmb.memory.region[i-1].base;
+                prevsize = lmb.memory.region[i-1].size;
+                base = lmb.memory.region[i].base;
+                if (base > (prevbase + prevsize)) {
+                        io_hole_start = prevbase + prevsize;
+                        io_hole_size = base  - (prevbase + prevsize);
+                        break;
+                }
+        }
+#endif /* CONFIG_PPC_ISERIES */
+        if (io_hole_start)
+                printk("IO Hole assumed to be %lx -> %lx\n",
+                       io_hole_start, io_hole_start + io_hole_size - 1);
+
+        ppc64_boot_msg(0x100, "MM Init Done");
+}
+
+void free_initmem(void)
+{
+        unsigned long addr;
+
+        addr = (unsigned long)__init_begin;
+        for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
+                memset((void *)addr, 0xcc, PAGE_SIZE);
+                ClearPageReserved(virt_to_page(addr));
+                set_page_count(virt_to_page(addr), 1);
+                free_page(addr);
+                totalram_pages++;
+        }
+        printk ("Freeing unused kernel memory: %luk freed\n",
+                ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
+}
+
+#ifdef CONFIG_BLK_DEV_INITRD
+void free_initrd_mem(unsigned long start, unsigned long end)
+{
+        if (start < end)
+                printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
+        for (; start < end; start += PAGE_SIZE) {
+                ClearPageReserved(virt_to_page(start));
+                set_page_count(virt_to_page(start), 1);
+                free_page(start);
+                totalram_pages++;
+        }
+}
+#endif
+
+static struct kcore_list kcore_vmem;
+
+static int __init setup_kcore(void)
+{
+        int i;
+
+        for (i=0; i < lmb.memory.cnt; i++) {
+                unsigned long base, size;
+                struct kcore_list *kcore_mem;
+
+                base = lmb.memory.region[i].base;
+                size = lmb.memory.region[i].size;
+
+                /* GFP_ATOMIC to avoid might_sleep warnings during boot */
+                kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
+                if (!kcore_mem)
+                        panic("mem_init: kmalloc failed\n");
+
+                kclist_add(kcore_mem, __va(base), size);
+        }
+
+        kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
+
+        return 0;
+}
+module_init(setup_kcore);
+
+static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags)
+{
+        memset(addr, 0, kmem_cache_size(cache));
+}
+
+static const int pgtable_cache_size[2] = {
+        PTE_TABLE_SIZE, PMD_TABLE_SIZE
+};
+static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
+        "pgd_pte_cache", "pud_pmd_cache",
+};
+
+kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
+
+void pgtable_cache_init(void)
+{
+        int i;
+
+        BUILD_BUG_ON(PTE_TABLE_SIZE != pgtable_cache_size[PTE_CACHE_NUM]);
+        BUILD_BUG_ON(PMD_TABLE_SIZE != pgtable_cache_size[PMD_CACHE_NUM]);
+        BUILD_BUG_ON(PUD_TABLE_SIZE != pgtable_cache_size[PUD_CACHE_NUM]);
+        BUILD_BUG_ON(PGD_TABLE_SIZE != pgtable_cache_size[PGD_CACHE_NUM]);
+
+        for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) {
+                int size = pgtable_cache_size[i];
+                const char *name = pgtable_cache_name[i];
+
+                pgtable_cache[i] = kmem_cache_create(name,
+                                                     size, size,
+                                                     SLAB_HWCACHE_ALIGN
+                                                     | SLAB_MUST_HWCACHE_ALIGN,
+                                                     zero_ctor,
+                                                     NULL);
+                if (! pgtable_cache[i])
+                        panic("pgtable_cache_init(): could not create %s!\n",
+                              name);
+        }
+}