* 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
*
*/
-#include <linux/config.h>
+#undef DEBUG
+
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/idr.h>
#include <linux/nodemask.h>
#include <linux/module.h>
+#include <linux/poison.h>
+#include <linux/lmb.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/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>
+
+#include "mmu_decl.h"
#if PGTABLE_RANGE > USER_VSID_RANGE
#warning Limited user VSID range means pagetable space is wasted
#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");
-}
+phys_addr_t memstart_addr = ~0;
+phys_addr_t kernstart_addr;
void free_initmem(void)
{
addr = (unsigned long)__init_begin;
for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
- memset((void *)addr, 0xcc, PAGE_SIZE);
+ memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
ClearPageReserved(virt_to_page(addr));
- set_page_count(virt_to_page(addr), 1);
+ init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages++;
}
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);
+ init_page_count(virt_to_page(start));
free_page(start);
totalram_pages++;
}
}
#endif
+#ifdef CONFIG_PROC_KCORE
static struct kcore_list kcore_vmem;
static int __init setup_kcore(void)
/* 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");
+ panic("%s: kmalloc failed\n", __func__);
kclist_add(kcore_mem, __va(base), size);
}
return 0;
}
module_init(setup_kcore);
+#endif
-static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags)
+static void pgd_ctor(void *addr)
{
- memset(addr, 0, kmem_cache_size(cache));
+ memset(addr, 0, PGD_TABLE_SIZE);
}
-static const int pgtable_cache_size[2] = {
- PTE_TABLE_SIZE, PMD_TABLE_SIZE
+static void pmd_ctor(void *addr)
+{
+ memset(addr, 0, PMD_TABLE_SIZE);
+}
+
+static const unsigned int pgtable_cache_size[2] = {
+ PGD_TABLE_SIZE, PMD_TABLE_SIZE
};
static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
- "pgd_pte_cache", "pud_pmd_cache",
+#ifdef CONFIG_PPC_64K_PAGES
+ "pgd_cache", "pmd_cache",
+#else
+ "pgd_cache", "pud_pmd_cache",
+#endif /* CONFIG_PPC_64K_PAGES */
};
-kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
+#ifdef CONFIG_HUGETLB_PAGE
+/* Hugepages need an extra cache per hugepagesize, initialized in
+ * hugetlbpage.c. We can't put into the tables above, because HPAGE_SHIFT
+ * is not compile time constant. */
+struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)+MMU_PAGE_COUNT];
+#else
+struct kmem_cache *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
+#endif
void pgtable_cache_init(void)
{
- int i;
+ pgtable_cache[0] = kmem_cache_create(pgtable_cache_name[0], PGD_TABLE_SIZE, PGD_TABLE_SIZE, SLAB_PANIC, pgd_ctor);
+ pgtable_cache[1] = kmem_cache_create(pgtable_cache_name[1], PMD_TABLE_SIZE, PMD_TABLE_SIZE, SLAB_PANIC, pmd_ctor);
+}
+
+#ifdef CONFIG_SPARSEMEM_VMEMMAP
+/*
+ * Given an address within the vmemmap, determine the pfn of the page that
+ * represents the start of the section it is within. Note that we have to
+ * do this by hand as the proffered address may not be correctly aligned.
+ * Subtraction of non-aligned pointers produces undefined results.
+ */
+static unsigned long __meminit vmemmap_section_start(unsigned long page)
+{
+ unsigned long offset = page - ((unsigned long)(vmemmap));
+
+ /* Return the pfn of the start of the section. */
+ return (offset / sizeof(struct page)) & PAGE_SECTION_MASK;
+}
+
+/*
+ * Check if this vmemmap page is already initialised. If any section
+ * which overlaps this vmemmap page is initialised then this page is
+ * initialised already.
+ */
+static int __meminit vmemmap_populated(unsigned long start, int page_size)
+{
+ unsigned long end = start + page_size;
+
+ for (; start < end; start += (PAGES_PER_SECTION * sizeof(struct page)))
+ if (pfn_valid(vmemmap_section_start(start)))
+ return 1;
+
+ return 0;
+}
+
+int __meminit vmemmap_populate(struct page *start_page,
+ unsigned long nr_pages, int node)
+{
+ unsigned long start = (unsigned long)start_page;
+ unsigned long end = (unsigned long)(start_page + nr_pages);
+ unsigned long page_size = 1 << mmu_psize_defs[mmu_vmemmap_psize].shift;
+
+ /* Align to the page size of the linear mapping. */
+ start = _ALIGN_DOWN(start, page_size);
+
+ for (; start < end; start += page_size) {
+ int mapped;
+ void *p;
- 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);
+ if (vmemmap_populated(start, page_size))
+ continue;
+
+ p = vmemmap_alloc_block(page_size, node);
+ if (!p)
+ return -ENOMEM;
+
+ pr_debug("vmemmap %08lx allocated at %p, physical %08lx.\n",
+ start, p, __pa(p));
+
+ mapped = htab_bolt_mapping(start, start + page_size, __pa(p),
+ pgprot_val(PAGE_KERNEL),
+ mmu_vmemmap_psize, mmu_kernel_ssize);
+ BUG_ON(mapped < 0);
}
+
+ return 0;
}
+#endif /* CONFIG_SPARSEMEM_VMEMMAP */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff