1 files changed, 564 insertions, 0 deletions

diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
new file mode 100644
index 000000000000..117b00012e14
--- /dev/null
+++ b/arch/powerpc/mm/mem.c
@@ -0,0 +1,564 @@
+/*
+ *  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).
+ *  PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
+ *
+ *  Derived from "arch/i386/mm/init.c"
+ *    Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
+ *
+ *  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/module.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/stddef.h>
+#include <linux/init.h>
+#include <linux/bootmem.h>
+#include <linux/highmem.h>
+#include <linux/initrd.h>
+#include <linux/pagemap.h>
+
+#include <asm/pgalloc.h>
+#include <asm/prom.h>
+#include <asm/io.h>
+#include <asm/mmu_context.h>
+#include <asm/pgtable.h>
+#include <asm/mmu.h>
+#include <asm/smp.h>
+#include <asm/machdep.h>
+#include <asm/btext.h>
+#include <asm/tlb.h>
+#include <asm/prom.h>
+#include <asm/lmb.h>
+#include <asm/sections.h>
+#ifdef CONFIG_PPC64
+#include <asm/vdso.h>
+#endif
+
+#include "mmu_decl.h"
+
+#ifndef CPU_FTR_COHERENT_ICACHE
+#define CPU_FTR_COHERENT_ICACHE 0       /* XXX for now */
+#define CPU_FTR_NOEXECUTE       0
+#endif
+
+int init_bootmem_done;
+int mem_init_done;
+unsigned long memory_limit;
+
+/*
+ * This is called by /dev/mem to know if a given address has to
+ * be mapped non-cacheable or not
+ */
+int page_is_ram(unsigned long pfn)
+{
+        unsigned long paddr = (pfn << PAGE_SHIFT);
+
+#ifndef CONFIG_PPC64    /* XXX for now */
+        return paddr < __pa(high_memory);
+#else
+        int i;
+        for (i=0; i < lmb.memory.cnt; i++) {
+                unsigned long base;
+
+                base = lmb.memory.region[i].base;
+
+                if ((paddr >= base) &&
+                        (paddr < (base + lmb.memory.region[i].size))) {
+                        return 1;
+                }
+        }
+
+        return 0;
+#endif
+}
+EXPORT_SYMBOL(page_is_ram);
+
+pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
+                              unsigned long size, pgprot_t vma_prot)
+{
+        if (ppc_md.phys_mem_access_prot)
+                return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
+
+        if (!page_is_ram(pfn))
+                vma_prot = __pgprot(pgprot_val(vma_prot)
+                                    | _PAGE_GUARDED | _PAGE_NO_CACHE);
+        return vma_prot;
+}
+EXPORT_SYMBOL(phys_mem_access_prot);
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+
+void online_page(struct page *page)
+{
+        ClearPageReserved(page);
+        free_cold_page(page);
+        totalram_pages++;
+        num_physpages++;
+}
+
+/*
+ * This works only for the non-NUMA case.  Later, we'll need a lookup
+ * to convert from real physical addresses to nid, that doesn't use
+ * pfn_to_nid().
+ */
+int __devinit add_memory(u64 start, u64 size)
+{
+        struct pglist_data *pgdata = NODE_DATA(0);
+        struct zone *zone;
+        unsigned long start_pfn = start >> PAGE_SHIFT;
+        unsigned long nr_pages = size >> PAGE_SHIFT;
+
+        /* this should work for most non-highmem platforms */
+        zone = pgdata->node_zones;
+
+        return __add_pages(zone, start_pfn, nr_pages);
+
+        return 0;
+}
+
+/*
+ * First pass at this code will check to determine if the remove
+ * request is within the RMO.  Do not allow removal within the RMO.
+ */
+int __devinit remove_memory(u64 start, u64 size)
+{
+        struct zone *zone;
+        unsigned long start_pfn, end_pfn, nr_pages;
+
+        start_pfn = start >> PAGE_SHIFT;
+        nr_pages = size >> PAGE_SHIFT;
+        end_pfn = start_pfn + nr_pages;
+
+        printk("%s(): Attempting to remove memoy in range "
+                        "%lx to %lx\n", __func__, start, start+size);
+        /*
+         * check for range within RMO
+         */
+        zone = page_zone(pfn_to_page(start_pfn));
+
+        printk("%s(): memory will be removed from "
+                        "the %s zone\n", __func__, zone->name);
+
+        /*
+         * not handling removing memory ranges that
+         * overlap multiple zones yet
+         */
+        if (end_pfn > (zone->zone_start_pfn + zone->spanned_pages))
+                goto overlap;
+
+        /* make sure it is NOT in RMO */
+        if ((start < lmb.rmo_size) || ((start+size) < lmb.rmo_size)) {
+                printk("%s(): range to be removed must NOT be in RMO!\n",
+                        __func__);
+                goto in_rmo;
+        }
+
+        return __remove_pages(zone, start_pfn, nr_pages);
+
+overlap:
+        printk("%s(): memory range to be removed overlaps "
+                "multiple zones!!!\n", __func__);
+in_rmo:
+        return -1;
+}
+#endif /* CONFIG_MEMORY_HOTPLUG */
+
+void show_mem(void)
+{
+        unsigned long total = 0, reserved = 0;
+        unsigned long shared = 0, cached = 0;
+        unsigned long highmem = 0;
+        struct page *page;
+        pg_data_t *pgdat;
+        unsigned long i;
+
+        printk("Mem-info:\n");
+        show_free_areas();
+        printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
+        for_each_pgdat(pgdat) {
+                unsigned long flags;
+                pgdat_resize_lock(pgdat, &flags);
+                for (i = 0; i < pgdat->node_spanned_pages; i++) {
+                        page = pgdat_page_nr(pgdat, i);
+                        total++;
+                        if (PageHighMem(page))
+                                highmem++;
+                        if (PageReserved(page))
+                                reserved++;
+                        else if (PageSwapCache(page))
+                                cached++;
+                        else if (page_count(page))
+                                shared += page_count(page) - 1;
+                }
+                pgdat_resize_unlock(pgdat, &flags);
+        }
+        printk("%ld pages of RAM\n", total);
+#ifdef CONFIG_HIGHMEM
+        printk("%ld pages of HIGHMEM\n", highmem);
+#endif
+        printk("%ld reserved pages\n", reserved);
+        printk("%ld pages shared\n", shared);
+        printk("%ld pages swap cached\n", cached);
+}
+
+/*
+ * Initialize the bootmem system and give it all the memory we
+ * have available.  If we are using highmem, we only put the
+ * lowmem into the bootmem system.
+ */
+#ifndef CONFIG_NEED_MULTIPLE_NODES
+void __init do_init_bootmem(void)
+{
+        unsigned long i;
+        unsigned long start, bootmap_pages;
+        unsigned long total_pages;
+        int boot_mapsize;
+
+        max_pfn = total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT;
+#ifdef CONFIG_HIGHMEM
+        total_pages = total_lowmem >> PAGE_SHIFT;
+#endif
+
+        /*
+         * Find an area to use for the bootmem bitmap.  Calculate the size of
+         * bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE.
+         * Add 1 additional page in case the address isn't page-aligned.
+         */
+        bootmap_pages = bootmem_bootmap_pages(total_pages);
+
+        start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
+        BUG_ON(!start);
+
+        boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages);
+
+        /* Add all physical memory to the bootmem map, mark each area
+         * present.
+         */
+        for (i = 0; i < lmb.memory.cnt; i++) {
+                unsigned long base = lmb.memory.region[i].base;
+                unsigned long size = lmb_size_bytes(&lmb.memory, i);
+#ifdef CONFIG_HIGHMEM
+                if (base >= total_lowmem)
+                        continue;
+                if (base + size > total_lowmem)
+                        size = total_lowmem - base;
+#endif
+                free_bootmem(base, size);
+        }
+
+        /* reserve the sections we're already using */
+        for (i = 0; i < lmb.reserved.cnt; i++)
+                reserve_bootmem(lmb.reserved.region[i].base,
+                                lmb_size_bytes(&lmb.reserved, i));
+
+        /* XXX need to clip this if using highmem? */
+        for (i = 0; i < lmb.memory.cnt; i++)
+                memory_present(0, lmb_start_pfn(&lmb.memory, i),
+                               lmb_end_pfn(&lmb.memory, i));
+        init_bootmem_done = 1;
+}
+
+/*
+ * paging_init() sets up the page tables - in fact we've already done this.
+ */
+void __init paging_init(void)
+{
+        unsigned long zones_size[MAX_NR_ZONES];
+        unsigned long zholes_size[MAX_NR_ZONES];
+        unsigned long total_ram = lmb_phys_mem_size();
+        unsigned long top_of_ram = lmb_end_of_DRAM();
+
+#ifdef CONFIG_HIGHMEM
+        map_page(PKMAP_BASE, 0, 0);     /* XXX gross */
+        pkmap_page_table = pte_offset_kernel(pmd_offset(pgd_offset_k
+                        (PKMAP_BASE), PKMAP_BASE), PKMAP_BASE);
+        map_page(KMAP_FIX_BEGIN, 0, 0); /* XXX gross */
+        kmap_pte = pte_offset_kernel(pmd_offset(pgd_offset_k
+                        (KMAP_FIX_BEGIN), KMAP_FIX_BEGIN), KMAP_FIX_BEGIN);
+        kmap_prot = PAGE_KERNEL;
+#endif /* CONFIG_HIGHMEM */
+
+        printk(KERN_INFO "Top of RAM: 0x%lx, Total RAM: 0x%lx\n",
+               top_of_ram, total_ram);
+        printk(KERN_INFO "Memory hole size: %ldMB\n",
+               (top_of_ram - total_ram) >> 20);
+        /*
+         * All pages are DMA-able so we put them all in the DMA zone.
+         */
+        memset(zones_size, 0, sizeof(zones_size));
+        memset(zholes_size, 0, sizeof(zholes_size));
+
+        zones_size[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
+        zholes_size[ZONE_DMA] = (top_of_ram - total_ram) >> PAGE_SHIFT;
+
+#ifdef CONFIG_HIGHMEM
+        zones_size[ZONE_DMA] = total_lowmem >> PAGE_SHIFT;
+        zones_size[ZONE_HIGHMEM] = (total_memory - total_lowmem) >> PAGE_SHIFT;
+        zholes_size[ZONE_HIGHMEM] = (top_of_ram - total_ram) >> PAGE_SHIFT;
+#else
+        zones_size[ZONE_DMA] = top_of_ram >> PAGE_SHIFT;
+        zholes_size[ZONE_DMA] = (top_of_ram - total_ram) >> PAGE_SHIFT;
+#endif /* CONFIG_HIGHMEM */
+
+        free_area_init_node(0, NODE_DATA(0), zones_size,
+                            __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size);
+}
+#endif /* ! CONFIG_NEED_MULTIPLE_NODES */
+
+void __init mem_init(void)
+{
+#ifdef CONFIG_NEED_MULTIPLE_NODES
+        int nid;
+#endif
+        pg_data_t *pgdat;
+        unsigned long i;
+        struct page *page;
+        unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
+
+        num_physpages = max_pfn;        /* RAM is assumed contiguous */
+        high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
+
+#ifdef CONFIG_NEED_MULTIPLE_NODES
+        for_each_online_node(nid) {
+                if (NODE_DATA(nid)->node_spanned_pages != 0) {
+                        printk("freeing bootmem node %x\n", nid);
+                        totalram_pages +=
+                                free_all_bootmem_node(NODE_DATA(nid));
+                }
+        }
+#else
+        max_mapnr = num_physpages;
+        totalram_pages += free_all_bootmem();
+#endif
+        for_each_pgdat(pgdat) {
+                for (i = 0; i < pgdat->node_spanned_pages; i++) {
+                        page = pgdat_page_nr(pgdat, i);
+                        if (PageReserved(page))
+                                reservedpages++;
+                }
+        }
+
+        codesize = (unsigned long)&_sdata - (unsigned long)&_stext;
+        datasize = (unsigned long)&__init_begin - (unsigned long)&_sdata;
+        initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
+        bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start;
+
+#ifdef CONFIG_HIGHMEM
+        {
+                unsigned long pfn, highmem_mapnr;
+
+                highmem_mapnr = total_lowmem >> PAGE_SHIFT;
+                for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
+                        struct page *page = pfn_to_page(pfn);
+
+                        ClearPageReserved(page);
+                        set_page_count(page, 1);
+                        __free_page(page);
+                        totalhigh_pages++;
+                }
+                totalram_pages += totalhigh_pages;
+                printk(KERN_INFO "High memory: %luk\n",
+                       totalhigh_pages << (PAGE_SHIFT-10));
+        }
+#endif /* CONFIG_HIGHMEM */
+
+        printk(KERN_INFO "Memory: %luk/%luk available (%luk kernel code, "
+               "%luk reserved, %luk data, %luk bss, %luk init)\n",
+                (unsigned long)nr_free_pages() << (PAGE_SHIFT-10),
+                num_physpages << (PAGE_SHIFT-10),
+                codesize >> 10,
+                reservedpages << (PAGE_SHIFT-10),
+                datasize >> 10,
+                bsssize >> 10,
+                initsize >> 10);
+
+        mem_init_done = 1;
+
+#ifdef CONFIG_PPC64
+        /* Initialize the vDSO */
+        vdso_init();
+#endif
+}
+
+/*
+ * This is called when a page has been modified by the kernel.
+ * It just marks the page as not i-cache clean.  We do the i-cache
+ * flush later when the page is given to a user process, if necessary.
+ */
+void flush_dcache_page(struct page *page)
+{
+        if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
+                return;
+        /* avoid an atomic op if possible */
+        if (test_bit(PG_arch_1, &page->flags))
+                clear_bit(PG_arch_1, &page->flags);
+}
+EXPORT_SYMBOL(flush_dcache_page);
+
+void flush_dcache_icache_page(struct page *page)
+{
+#ifdef CONFIG_BOOKE
+        void *start = kmap_atomic(page, KM_PPC_SYNC_ICACHE);
+        __flush_dcache_icache(start);
+        kunmap_atomic(start, KM_PPC_SYNC_ICACHE);
+#elif defined(CONFIG_8xx) || defined(CONFIG_PPC64)
+        /* On 8xx there is no need to kmap since highmem is not supported */
+        __flush_dcache_icache(page_address(page)); 
+#else
+        __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
+#endif
+
+}
+void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
+{
+        clear_page(page);
+
+        if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
+                return;
+        /*
+         * We shouldnt have to do this, but some versions of glibc
+         * require it (ld.so assumes zero filled pages are icache clean)
+         * - Anton
+         */
+
+        /* avoid an atomic op if possible */
+        if (test_bit(PG_arch_1, &pg->flags))
+                clear_bit(PG_arch_1, &pg->flags);
+}
+EXPORT_SYMBOL(clear_user_page);
+
+void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
+                    struct page *pg)
+{
+        copy_page(vto, vfrom);
+
+        /*
+         * We should be able to use the following optimisation, however
+         * there are two problems.
+         * Firstly a bug in some versions of binutils meant PLT sections
+         * were not marked executable.
+         * Secondly the first word in the GOT section is blrl, used
+         * to establish the GOT address. Until recently the GOT was
+         * not marked executable.
+         * - Anton
+         */
+#if 0
+        if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
+                return;
+#endif
+
+        if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
+                return;
+
+        /* avoid an atomic op if possible */
+        if (test_bit(PG_arch_1, &pg->flags))
+                clear_bit(PG_arch_1, &pg->flags);
+}
+
+void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
+                             unsigned long addr, int len)
+{
+        unsigned long maddr;
+
+        maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
+        flush_icache_range(maddr, maddr + len);
+        kunmap(page);
+}
+EXPORT_SYMBOL(flush_icache_user_range);
+
+/*
+ * This is called at the end of handling a user page fault, when the
+ * fault has been handled by updating a PTE in the linux page tables.
+ * We use it to preload an HPTE into the hash table corresponding to
+ * the updated linux PTE.
+ * 
+ * This must always be called with the mm->page_table_lock held
+ */
+void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
+                      pte_t pte)
+{
+        /* handle i-cache coherency */
+        unsigned long pfn = pte_pfn(pte);
+#ifdef CONFIG_PPC32
+        pmd_t *pmd;
+#else
+        unsigned long vsid;
+        void *pgdir;
+        pte_t *ptep;
+        int local = 0;
+        cpumask_t tmp;
+        unsigned long flags;
+#endif
+
+        /* handle i-cache coherency */
+        if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) &&
+            !cpu_has_feature(CPU_FTR_NOEXECUTE) &&
+            pfn_valid(pfn)) {
+                struct page *page = pfn_to_page(pfn);
+                if (!PageReserved(page)
+                    && !test_bit(PG_arch_1, &page->flags)) {
+                        if (vma->vm_mm == current->active_mm) {
+#ifdef CONFIG_8xx
+                        /* On 8xx, cache control instructions (particularly 
+                         * "dcbst" from flush_dcache_icache) fault as write 
+                         * operation if there is an unpopulated TLB entry 
+                         * for the address in question. To workaround that, 
+                         * we invalidate the TLB here, thus avoiding dcbst 
+                         * misbehaviour.
+                         */
+                                _tlbie(address);
+#endif
+                                __flush_dcache_icache((void *) address);
+                        } else
+                                flush_dcache_icache_page(page);
+                        set_bit(PG_arch_1, &page->flags);
+                }
+        }
+
+#ifdef CONFIG_PPC_STD_MMU
+        /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
+        if (!pte_young(pte) || address >= TASK_SIZE)
+                return;
+#ifdef CONFIG_PPC32
+        if (Hash == 0)
+                return;
+        pmd = pmd_offset(pgd_offset(vma->vm_mm, address), address);
+        if (!pmd_none(*pmd))
+                add_hash_page(vma->vm_mm->context, address, pmd_val(*pmd));
+#else
+        pgdir = vma->vm_mm->pgd;
+        if (pgdir == NULL)
+                return;
+
+        ptep = find_linux_pte(pgdir, address);
+        if (!ptep)
+                return;
+
+        vsid = get_vsid(vma->vm_mm->context.id, address);
+
+        local_irq_save(flags);
+        tmp = cpumask_of_cpu(smp_processor_id());
+        if (cpus_equal(vma->vm_mm->cpu_vm_mask, tmp))
+                local = 1;
+
+        __hash_page(address, 0, vsid, ptep, 0x300, local);
+        local_irq_restore(flags);
+#endif
+#endif
+}