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-rw-r--r--arch/ppc64/mm/init.c927
1 files changed, 927 insertions, 0 deletions
diff --git a/arch/ppc64/mm/init.c b/arch/ppc64/mm/init.c
new file mode 100644
index 000000000000..23813d03e1c4
--- /dev/null
+++ b/arch/ppc64/mm/init.c
@@ -0,0 +1,927 @@
+/*
+ * 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/abs_addr.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>
+
+int mem_init_done;
+unsigned long ioremap_bot = IMALLOC_BASE;
+static unsigned long phbs_io_bot = PHBS_IO_BASE;
+
+extern pgd_t swapper_pg_dir[];
+extern struct task_struct *current_set[NR_CPUS];
+
+extern pgd_t ioremap_dir[];
+pgd_t * ioremap_pgd = (pgd_t *)&ioremap_dir;
+
+unsigned long klimit = (unsigned long)_end;
+
+unsigned long _SDR1=0;
+unsigned long _ASR=0;
+
+/* 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;
+
+void show_mem(void)
+{
+ unsigned long total = 0, reserved = 0;
+ unsigned long shared = 0, cached = 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) {
+ for (i = 0; i < pgdat->node_spanned_pages; i++) {
+ page = pgdat->node_mem_map + i;
+ total++;
+ if (PageReserved(page))
+ reserved++;
+ else if (PageSwapCache(page))
+ cached++;
+ else if (page_count(page))
+ shared += page_count(page) - 1;
+ }
+ }
+ printk("%ld pages of RAM\n", total);
+ printk("%ld reserved pages\n", reserved);
+ printk("%ld pages shared\n", shared);
+ printk("%ld pages swap cached\n", cached);
+}
+
+#ifdef CONFIG_PPC_ISERIES
+
+void __iomem *ioremap(unsigned long addr, unsigned long size)
+{
+ return (void __iomem *)addr;
+}
+
+extern void __iomem *__ioremap(unsigned long addr, unsigned long size,
+ unsigned long flags)
+{
+ return (void __iomem *)addr;
+}
+
+void iounmap(volatile void __iomem *addr)
+{
+ return;
+}
+
+#else
+
+/*
+ * map_io_page currently only called by __ioremap
+ * map_io_page adds an entry to the ioremap page table
+ * and adds an entry to the HPT, possibly bolting it
+ */
+static void map_io_page(unsigned long ea, unsigned long pa, int flags)
+{
+ pgd_t *pgdp;
+ pmd_t *pmdp;
+ pte_t *ptep;
+ unsigned long vsid;
+
+ if (mem_init_done) {
+ spin_lock(&ioremap_mm.page_table_lock);
+ pgdp = pgd_offset_i(ea);
+ pmdp = pmd_alloc(&ioremap_mm, pgdp, ea);
+ ptep = pte_alloc_kernel(&ioremap_mm, pmdp, ea);
+
+ pa = abs_to_phys(pa);
+ set_pte_at(&ioremap_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT, __pgprot(flags)));
+ spin_unlock(&ioremap_mm.page_table_lock);
+ } else {
+ unsigned long va, vpn, hash, hpteg;
+
+ /*
+ * If the mm subsystem is not fully up, we cannot create a
+ * linux page table entry for this mapping. Simply bolt an
+ * entry in the hardware page table.
+ */
+ vsid = get_kernel_vsid(ea);
+ va = (vsid << 28) | (ea & 0xFFFFFFF);
+ vpn = va >> PAGE_SHIFT;
+
+ hash = hpt_hash(vpn, 0);
+
+ hpteg = ((hash & htab_hash_mask) * HPTES_PER_GROUP);
+
+ /* Panic if a pte grpup is full */
+ if (ppc_md.hpte_insert(hpteg, va, pa >> PAGE_SHIFT, 0,
+ _PAGE_NO_CACHE|_PAGE_GUARDED|PP_RWXX,
+ 1, 0) == -1) {
+ panic("map_io_page: could not insert mapping");
+ }
+ }
+}
+
+
+static void __iomem * __ioremap_com(unsigned long addr, unsigned long pa,
+ unsigned long ea, unsigned long size,
+ unsigned long flags)
+{
+ unsigned long i;
+
+ if ((flags & _PAGE_PRESENT) == 0)
+ flags |= pgprot_val(PAGE_KERNEL);
+ if (flags & (_PAGE_NO_CACHE | _PAGE_WRITETHRU))
+ flags |= _PAGE_GUARDED;
+
+ for (i = 0; i < size; i += PAGE_SIZE) {
+ map_io_page(ea+i, pa+i, flags);
+ }
+
+ return (void __iomem *) (ea + (addr & ~PAGE_MASK));
+}
+
+
+void __iomem *
+ioremap(unsigned long addr, unsigned long size)
+{
+ return __ioremap(addr, size, _PAGE_NO_CACHE);
+}
+
+void __iomem *
+__ioremap(unsigned long addr, unsigned long size, unsigned long flags)
+{
+ unsigned long pa, ea;
+
+ /*
+ * Choose an address to map it to.
+ * Once the imalloc system is running, we use it.
+ * Before that, we map using addresses going
+ * up from ioremap_bot. imalloc will use
+ * the addresses from ioremap_bot through
+ * IMALLOC_END (0xE000001fffffffff)
+ *
+ */
+ pa = addr & PAGE_MASK;
+ size = PAGE_ALIGN(addr + size) - pa;
+
+ if (size == 0)
+ return NULL;
+
+ if (mem_init_done) {
+ struct vm_struct *area;
+ area = im_get_free_area(size);
+ if (area == NULL)
+ return NULL;
+ ea = (unsigned long)(area->addr);
+ } else {
+ ea = ioremap_bot;
+ ioremap_bot += size;
+ }
+
+ return __ioremap_com(addr, pa, ea, size, flags);
+}
+
+#define IS_PAGE_ALIGNED(_val) ((_val) == ((_val) & PAGE_MASK))
+
+int __ioremap_explicit(unsigned long pa, unsigned long ea,
+ unsigned long size, unsigned long flags)
+{
+ struct vm_struct *area;
+
+ /* For now, require page-aligned values for pa, ea, and size */
+ if (!IS_PAGE_ALIGNED(pa) || !IS_PAGE_ALIGNED(ea) ||
+ !IS_PAGE_ALIGNED(size)) {
+ printk(KERN_ERR "unaligned value in %s\n", __FUNCTION__);
+ return 1;
+ }
+
+ if (!mem_init_done) {
+ /* Two things to consider in this case:
+ * 1) No records will be kept (imalloc, etc) that the region
+ * has been remapped
+ * 2) It won't be easy to iounmap() the region later (because
+ * of 1)
+ */
+ ;
+ } else {
+ area = im_get_area(ea, size,
+ IM_REGION_UNUSED|IM_REGION_SUBSET|IM_REGION_EXISTS);
+ if (area == NULL) {
+ /* Expected when PHB-dlpar is in play */
+ return 1;
+ }
+ if (ea != (unsigned long) area->addr) {
+ printk(KERN_ERR "unexpected addr return from im_get_area\n");
+ return 1;
+ }
+ }
+
+ if (__ioremap_com(pa, pa, ea, size, flags) != (void *) ea) {
+ printk(KERN_ERR "__ioremap_com() returned unexpected addr\n");
+ return 1;
+ }
+
+ return 0;
+}
+
+static void unmap_im_area_pte(pmd_t *pmd, unsigned long address,
+ unsigned long size)
+{
+ unsigned long base, end;
+ pte_t *pte;
+
+ if (pmd_none(*pmd))
+ return;
+ if (pmd_bad(*pmd)) {
+ pmd_ERROR(*pmd);
+ pmd_clear(pmd);
+ return;
+ }
+
+ pte = pte_offset_kernel(pmd, address);
+ base = address & PMD_MASK;
+ address &= ~PMD_MASK;
+ end = address + size;
+ if (end > PMD_SIZE)
+ end = PMD_SIZE;
+
+ do {
+ pte_t page;
+ page = ptep_get_and_clear(&ioremap_mm, base + address, pte);
+ address += PAGE_SIZE;
+ pte++;
+ if (pte_none(page))
+ continue;
+ if (pte_present(page))
+ continue;
+ printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
+ } while (address < end);
+}
+
+static void unmap_im_area_pmd(pgd_t *dir, unsigned long address,
+ unsigned long size)
+{
+ unsigned long base, end;
+ pmd_t *pmd;
+
+ if (pgd_none(*dir))
+ return;
+ if (pgd_bad(*dir)) {
+ pgd_ERROR(*dir);
+ pgd_clear(dir);
+ return;
+ }
+
+ pmd = pmd_offset(dir, address);
+ base = address & PGDIR_MASK;
+ address &= ~PGDIR_MASK;
+ end = address + size;
+ if (end > PGDIR_SIZE)
+ end = PGDIR_SIZE;
+
+ do {
+ unmap_im_area_pte(pmd, base + address, end - address);
+ address = (address + PMD_SIZE) & PMD_MASK;
+ pmd++;
+ } while (address < end);
+}
+
+/*
+ * Unmap an IO region and remove it from imalloc'd list.
+ * Access to IO memory should be serialized by driver.
+ * This code is modeled after vmalloc code - unmap_vm_area()
+ *
+ * XXX what about calls before mem_init_done (ie python_countermeasures())
+ */
+void iounmap(volatile void __iomem *token)
+{
+ unsigned long address, start, end, size;
+ struct mm_struct *mm;
+ pgd_t *dir;
+ void *addr;
+
+ if (!mem_init_done) {
+ return;
+ }
+
+ addr = (void *) ((unsigned long __force) token & PAGE_MASK);
+
+ if ((size = im_free(addr)) == 0) {
+ return;
+ }
+
+ address = (unsigned long)addr;
+ start = address;
+ end = address + size;
+
+ mm = &ioremap_mm;
+ spin_lock(&mm->page_table_lock);
+
+ dir = pgd_offset_i(address);
+ flush_cache_vunmap(address, end);
+ do {
+ unmap_im_area_pmd(dir, address, end - address);
+ address = (address + PGDIR_SIZE) & PGDIR_MASK;
+ dir++;
+ } while (address && (address < end));
+ flush_tlb_kernel_range(start, end);
+
+ spin_unlock(&mm->page_table_lock);
+ return;
+}
+
+static int iounmap_subset_regions(unsigned long addr, unsigned long size)
+{
+ struct vm_struct *area;
+
+ /* Check whether subsets of this region exist */
+ area = im_get_area(addr, size, IM_REGION_SUPERSET);
+ if (area == NULL)
+ return 1;
+
+ while (area) {
+ iounmap((void __iomem *) area->addr);
+ area = im_get_area(addr, size,
+ IM_REGION_SUPERSET);
+ }
+
+ return 0;
+}
+
+int iounmap_explicit(volatile void __iomem *start, unsigned long size)
+{
+ struct vm_struct *area;
+ unsigned long addr;
+ int rc;
+
+ addr = (unsigned long __force) start & PAGE_MASK;
+
+ /* Verify that the region either exists or is a subset of an existing
+ * region. In the latter case, split the parent region to create
+ * the exact region
+ */
+ area = im_get_area(addr, size,
+ IM_REGION_EXISTS | IM_REGION_SUBSET);
+ if (area == NULL) {
+ /* Determine whether subset regions exist. If so, unmap */
+ rc = iounmap_subset_regions(addr, size);
+ if (rc) {
+ printk(KERN_ERR
+ "%s() cannot unmap nonexistent range 0x%lx\n",
+ __FUNCTION__, addr);
+ return 1;
+ }
+ } else {
+ iounmap((void __iomem *) area->addr);
+ }
+ /*
+ * FIXME! This can't be right:
+ iounmap(area->addr);
+ * Maybe it should be "iounmap(area);"
+ */
+ return 0;
+}
+
+#endif
+
+EXPORT_SYMBOL(ioremap);
+EXPORT_SYMBOL(__ioremap);
+EXPORT_SYMBOL(iounmap);
+
+void free_initmem(void)
+{
+ unsigned long addr;
+
+ addr = (unsigned long)__init_begin;
+ for (; addr < (unsigned long)__init_end; addr += 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 DEFINE_SPINLOCK(mmu_context_lock);
+static DEFINE_IDR(mmu_context_idr);
+
+int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
+{
+ int index;
+ int err;
+
+#ifdef CONFIG_HUGETLB_PAGE
+ /* We leave htlb_segs as it was, but for a fork, we need to
+ * clear the huge_pgdir. */
+ mm->context.huge_pgdir = NULL;
+#endif
+
+again:
+ if (!idr_pre_get(&mmu_context_idr, GFP_KERNEL))
+ return -ENOMEM;
+
+ spin_lock(&mmu_context_lock);
+ err = idr_get_new_above(&mmu_context_idr, NULL, 1, &index);
+ spin_unlock(&mmu_context_lock);
+
+ if (err == -EAGAIN)
+ goto again;
+ else if (err)
+ return err;
+
+ if (index > MAX_CONTEXT) {
+ idr_remove(&mmu_context_idr, index);
+ return -ENOMEM;
+ }
+
+ mm->context.id = index;
+
+ return 0;
+}
+
+void destroy_context(struct mm_struct *mm)
+{
+ spin_lock(&mmu_context_lock);
+ idr_remove(&mmu_context_idr, mm->context.id);
+ spin_unlock(&mmu_context_lock);
+
+ mm->context.id = NO_CONTEXT;
+
+ hugetlb_mm_free_pgd(mm);
+}
+
+/*
+ * 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].physbase;
+ prevsize = lmb.memory.region[i-1].size;
+ base = lmb.memory.region[i].physbase;
+ 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");
+}
+
+/*
+ * 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)
+{
+ int i;
+ unsigned long paddr = (pfn << PAGE_SHIFT);
+
+ for (i=0; i < lmb.memory.cnt; i++) {
+ unsigned long base;
+
+#ifdef CONFIG_MSCHUNKS
+ base = lmb.memory.region[i].physbase;
+#else
+ base = lmb.memory.region[i].base;
+#endif
+ if ((paddr >= base) &&
+ (paddr < (base + lmb.memory.region[i].size))) {
+ return 1;
+ }
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(page_is_ram);
+
+/*
+ * Initialize the bootmem system and give it all the memory we
+ * have available.
+ */
+#ifndef CONFIG_DISCONTIGMEM
+void __init do_init_bootmem(void)
+{
+ unsigned long i;
+ unsigned long start, bootmap_pages;
+ unsigned long total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT;
+ int boot_mapsize;
+
+ /*
+ * 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 = abs_to_phys(lmb_alloc(bootmap_pages<<PAGE_SHIFT, PAGE_SIZE));
+ BUG_ON(!start);
+
+ boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages);
+
+ max_pfn = max_low_pfn;
+
+ /* add all physical memory to the bootmem map. Also find the first */
+ for (i=0; i < lmb.memory.cnt; i++) {
+ unsigned long physbase, size;
+
+ physbase = lmb.memory.region[i].physbase;
+ size = lmb.memory.region[i].size;
+ free_bootmem(physbase, size);
+ }
+
+ /* reserve the sections we're already using */
+ for (i=0; i < lmb.reserved.cnt; i++) {
+ unsigned long physbase = lmb.reserved.region[i].physbase;
+ unsigned long size = lmb.reserved.region[i].size;
+
+ reserve_bootmem(physbase, size);
+ }
+}
+
+/*
+ * 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();
+
+ 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;
+
+ free_area_init_node(0, &contig_page_data, zones_size,
+ __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size);
+}
+#endif /* CONFIG_DISCONTIGMEM */
+
+static struct kcore_list kcore_vmem;
+
+static int __init setup_kcore(void)
+{
+ int i;
+
+ for (i=0; i < lmb.memory.cnt; i++) {
+ unsigned long physbase, size;
+ struct kcore_list *kcore_mem;
+
+ physbase = lmb.memory.region[i].physbase;
+ 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(physbase), size);
+ }
+
+ kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
+
+ return 0;
+}
+module_init(setup_kcore);
+
+void __init mem_init(void)
+{
+#ifdef CONFIG_DISCONTIGMEM
+ int nid;
+#endif
+ pg_data_t *pgdat;
+ unsigned long i;
+ struct page *page;
+ unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
+
+ num_physpages = max_low_pfn; /* RAM is assumed contiguous */
+ high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
+
+#ifdef CONFIG_DISCONTIGMEM
+ 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->node_mem_map + i;
+ if (PageReserved(page))
+ reservedpages++;
+ }
+ }
+
+ codesize = (unsigned long)&_etext - (unsigned long)&_stext;
+ initsize = (unsigned long)&__init_end - (unsigned long)&__init_begin;
+ datasize = (unsigned long)&_edata - (unsigned long)&__init_end;
+ bsssize = (unsigned long)&__bss_stop - (unsigned long)&__bss_start;
+
+ 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_PPC_ISERIES
+ iommu_vio_init();
+#endif
+ /* Initialize the vDSO */
+ vdso_init();
+}
+
+/*
+ * 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 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)page_address(page) + (addr & ~PAGE_MASK);
+ flush_icache_range(maddr, maddr + len);
+}
+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 ea,
+ pte_t pte)
+{
+ unsigned long vsid;
+ void *pgdir;
+ pte_t *ptep;
+ int local = 0;
+ cpumask_t tmp;
+ unsigned long flags;
+
+ /* handle i-cache coherency */
+ if (!cpu_has_feature(CPU_FTR_COHERENT_ICACHE) &&
+ !cpu_has_feature(CPU_FTR_NOEXECUTE)) {
+ unsigned long pfn = pte_pfn(pte);
+ if (pfn_valid(pfn)) {
+ struct page *page = pfn_to_page(pfn);
+ if (!PageReserved(page)
+ && !test_bit(PG_arch_1, &page->flags)) {
+ __flush_dcache_icache(page_address(page));
+ set_bit(PG_arch_1, &page->flags);
+ }
+ }
+ }
+
+ /* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
+ if (!pte_young(pte))
+ return;
+
+ pgdir = vma->vm_mm->pgd;
+ if (pgdir == NULL)
+ return;
+
+ ptep = find_linux_pte(pgdir, ea);
+ if (!ptep)
+ return;
+
+ vsid = get_vsid(vma->vm_mm->context.id, ea);
+
+ 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(ea, pte_val(pte) & (_PAGE_USER|_PAGE_RW), vsid, ptep,
+ 0x300, local);
+ local_irq_restore(flags);
+}
+
+void __iomem * reserve_phb_iospace(unsigned long size)
+{
+ void __iomem *virt_addr;
+
+ if (phbs_io_bot >= IMALLOC_BASE)
+ panic("reserve_phb_iospace(): phb io space overflow\n");
+
+ virt_addr = (void __iomem *) phbs_io_bot;
+ phbs_io_bot += size;
+
+ return virt_addr;
+}
+
+kmem_cache_t *zero_cache;
+
+static void zero_ctor(void *pte, kmem_cache_t *cache, unsigned long flags)
+{
+ memset(pte, 0, PAGE_SIZE);
+}
+
+void pgtable_cache_init(void)
+{
+ zero_cache = kmem_cache_create("zero",
+ PAGE_SIZE,
+ 0,
+ SLAB_HWCACHE_ALIGN | SLAB_MUST_HWCACHE_ALIGN,
+ zero_ctor,
+ NULL);
+ if (!zero_cache)
+ panic("pgtable_cache_init(): could not create zero_cache!\n");
+}
+
+pgprot_t phys_mem_access_prot(struct file *file, unsigned long addr,
+ unsigned long size, pgprot_t vma_prot)
+{
+ if (ppc_md.phys_mem_access_prot)
+ return ppc_md.phys_mem_access_prot(file, addr, size, vma_prot);
+
+ if (!page_is_ram(addr >> PAGE_SHIFT))
+ vma_prot = __pgprot(pgprot_val(vma_prot)
+ | _PAGE_GUARDED | _PAGE_NO_CACHE);
+ return vma_prot;
+}
+EXPORT_SYMBOL(phys_mem_access_prot);
generated by cgit v1.2.3 (git 2.0.4) at 2024-05-31 14:22:01 +0000