aboutsummaryrefslogtreecommitdiff
path: root/arch/ppc/mm/init.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/ppc/mm/init.c')
-rw-r--r--arch/ppc/mm/init.c603
1 files changed, 0 insertions, 603 deletions
diff --git a/arch/ppc/mm/init.c b/arch/ppc/mm/init.c
deleted file mode 100644
index 1a63711081b5..000000000000
--- a/arch/ppc/mm/init.c
+++ /dev/null
@@ -1,603 +0,0 @@
-/*
- * 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/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/bootinfo.h>
-
-#include "mem_pieces.h"
-#include "mmu_decl.h"
-
-#if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL)
-/* The amount of lowmem must be within 0xF0000000 - KERNELBASE. */
-#if (CONFIG_LOWMEM_SIZE > (0xF0000000 - KERNELBASE))
-#error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_START_KERNEL"
-#endif
-#endif
-#define MAX_LOW_MEM CONFIG_LOWMEM_SIZE
-
-DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
-
-unsigned long total_memory;
-unsigned long total_lowmem;
-
-unsigned long ppc_memstart;
-unsigned long ppc_memoffset = PAGE_OFFSET;
-
-int mem_init_done;
-int init_bootmem_done;
-int boot_mapsize;
-
-extern char _end[];
-extern char etext[], _stext[];
-extern char __init_begin, __init_end;
-
-#ifdef CONFIG_HIGHMEM
-pte_t *kmap_pte;
-pgprot_t kmap_prot;
-
-EXPORT_SYMBOL(kmap_prot);
-EXPORT_SYMBOL(kmap_pte);
-#endif
-
-void MMU_init(void);
-void set_phys_avail(unsigned long total_ram);
-
-/* XXX should be in current.h -- paulus */
-extern struct task_struct *current_set[NR_CPUS];
-
-char *klimit = _end;
-struct mem_pieces phys_avail;
-
-/*
- * this tells the system to map all of ram with the segregs
- * (i.e. page tables) instead of the bats.
- * -- Cort
- */
-int __map_without_bats;
-int __map_without_ltlbs;
-
-/* max amount of RAM to use */
-unsigned long __max_memory;
-/* max amount of low RAM to map in */
-unsigned long __max_low_memory = MAX_LOW_MEM;
-
-void show_mem(void)
-{
- int i,free = 0,total = 0,reserved = 0;
- int shared = 0, cached = 0;
- int highmem = 0;
-
- printk("Mem-info:\n");
- show_free_areas();
- i = max_mapnr;
- while (i-- > 0) {
- total++;
- if (PageHighMem(mem_map+i))
- highmem++;
- if (PageReserved(mem_map+i))
- reserved++;
- else if (PageSwapCache(mem_map+i))
- cached++;
- else if (!page_count(mem_map+i))
- free++;
- else
- shared += page_count(mem_map+i) - 1;
- }
- printk("%d pages of RAM\n",total);
- printk("%d pages of HIGHMEM\n", highmem);
- printk("%d free pages\n",free);
- printk("%d reserved pages\n",reserved);
- printk("%d pages shared\n",shared);
- printk("%d pages swap cached\n",cached);
-}
-
-/* Free up now-unused memory */
-static void free_sec(unsigned long start, unsigned long end, const char *name)
-{
- unsigned long cnt = 0;
-
- while (start < end) {
- ClearPageReserved(virt_to_page(start));
- init_page_count(virt_to_page(start));
- free_page(start);
- cnt++;
- start += PAGE_SIZE;
- }
- if (cnt) {
- printk(" %ldk %s", cnt << (PAGE_SHIFT - 10), name);
- totalram_pages += cnt;
- }
-}
-
-void free_initmem(void)
-{
-#define FREESEC(TYPE) \
- free_sec((unsigned long)(&__ ## TYPE ## _begin), \
- (unsigned long)(&__ ## TYPE ## _end), \
- #TYPE);
-
- printk ("Freeing unused kernel memory:");
- FREESEC(init);
- printk("\n");
- ppc_md.progress = NULL;
-#undef FREESEC
-}
-
-#ifdef CONFIG_BLK_DEV_INITRD
-void free_initrd_mem(unsigned long start, unsigned long end)
-{
- printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
-
- for (; start < end; start += PAGE_SIZE) {
- ClearPageReserved(virt_to_page(start));
- init_page_count(virt_to_page(start));
- free_page(start);
- totalram_pages++;
- }
-}
-#endif
-
-/*
- * Check for command-line options that affect what MMU_init will do.
- */
-void MMU_setup(void)
-{
- /* Check for nobats option (used in mapin_ram). */
- if (strstr(cmd_line, "nobats")) {
- __map_without_bats = 1;
- }
-
- if (strstr(cmd_line, "noltlbs")) {
- __map_without_ltlbs = 1;
- }
-
- /* Look for mem= option on command line */
- if (strstr(cmd_line, "mem=")) {
- char *p, *q;
- unsigned long maxmem = 0;
-
- for (q = cmd_line; (p = strstr(q, "mem=")) != 0; ) {
- q = p + 4;
- if (p > cmd_line && p[-1] != ' ')
- continue;
- maxmem = simple_strtoul(q, &q, 0);
- if (*q == 'k' || *q == 'K') {
- maxmem <<= 10;
- ++q;
- } else if (*q == 'm' || *q == 'M') {
- maxmem <<= 20;
- ++q;
- }
- }
- __max_memory = maxmem;
- }
-}
-
-/*
- * MMU_init sets up the basic memory mappings for the kernel,
- * including both RAM and possibly some I/O regions,
- * and sets up the page tables and the MMU hardware ready to go.
- */
-void __init MMU_init(void)
-{
- if (ppc_md.progress)
- ppc_md.progress("MMU:enter", 0x111);
-
- /* parse args from command line */
- MMU_setup();
-
- /*
- * Figure out how much memory we have, how much
- * is lowmem, and how much is highmem. If we were
- * passed the total memory size from the bootloader,
- * just use it.
- */
- if (boot_mem_size)
- total_memory = boot_mem_size;
- else
- total_memory = ppc_md.find_end_of_memory();
-
- if (__max_memory && total_memory > __max_memory)
- total_memory = __max_memory;
- total_lowmem = total_memory;
- if (total_lowmem > __max_low_memory) {
- total_lowmem = __max_low_memory;
-#ifndef CONFIG_HIGHMEM
- total_memory = total_lowmem;
-#endif /* CONFIG_HIGHMEM */
- }
- set_phys_avail(total_lowmem);
-
- /* Initialize the MMU hardware */
- if (ppc_md.progress)
- ppc_md.progress("MMU:hw init", 0x300);
- MMU_init_hw();
-
- /* Map in all of RAM starting at KERNELBASE */
- if (ppc_md.progress)
- ppc_md.progress("MMU:mapin", 0x301);
- mapin_ram();
-
-#ifdef CONFIG_HIGHMEM
- ioremap_base = PKMAP_BASE;
-#else
- ioremap_base = 0xfe000000UL; /* for now, could be 0xfffff000 */
-#endif /* CONFIG_HIGHMEM */
- ioremap_bot = ioremap_base;
-
- /* Map in I/O resources */
- if (ppc_md.progress)
- ppc_md.progress("MMU:setio", 0x302);
- if (ppc_md.setup_io_mappings)
- ppc_md.setup_io_mappings();
-
- /* Initialize the context management stuff */
- mmu_context_init();
-
- if (ppc_md.progress)
- ppc_md.progress("MMU:exit", 0x211);
-
-#ifdef CONFIG_BOOTX_TEXT
- /* By default, we are no longer mapped */
- boot_text_mapped = 0;
- /* Must be done last, or ppc_md.progress will die. */
- map_boot_text();
-#endif
-}
-
-/* This is only called until mem_init is done. */
-void __init *early_get_page(void)
-{
- void *p;
-
- if (init_bootmem_done) {
- p = alloc_bootmem_pages(PAGE_SIZE);
- } else {
- p = mem_pieces_find(PAGE_SIZE, PAGE_SIZE);
- }
- return p;
-}
-
-/*
- * Initialize the bootmem system and give it all the memory we
- * have available.
- */
-void __init do_init_bootmem(void)
-{
- unsigned long start, size;
- int i;
-
- /*
- * Find an area to use for the bootmem bitmap.
- * We look for the first area which is at least
- * 128kB in length (128kB is enough for a bitmap
- * for 4GB of memory, using 4kB pages), plus 1 page
- * (in case the address isn't page-aligned).
- */
- start = 0;
- size = 0;
- for (i = 0; i < phys_avail.n_regions; ++i) {
- unsigned long a = phys_avail.regions[i].address;
- unsigned long s = phys_avail.regions[i].size;
- if (s <= size)
- continue;
- start = a;
- size = s;
- if (s >= 33 * PAGE_SIZE)
- break;
- }
- start = PAGE_ALIGN(start);
-
- min_low_pfn = start >> PAGE_SHIFT;
- max_low_pfn = (PPC_MEMSTART + total_lowmem) >> PAGE_SHIFT;
- max_pfn = (PPC_MEMSTART + total_memory) >> PAGE_SHIFT;
- boot_mapsize = init_bootmem_node(&contig_page_data, min_low_pfn,
- PPC_MEMSTART >> PAGE_SHIFT,
- max_low_pfn);
-
- /* remove the bootmem bitmap from the available memory */
- mem_pieces_remove(&phys_avail, start, boot_mapsize, 1);
-
- /* add everything in phys_avail into the bootmem map */
- for (i = 0; i < phys_avail.n_regions; ++i)
- free_bootmem(phys_avail.regions[i].address,
- phys_avail.regions[i].size);
-
- 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 start_pfn, end_pfn;
- unsigned long max_zone_pfns[MAX_NR_ZONES];
-#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 */
- /* All pages are DMA-able so we put them all in the DMA zone. */
- start_pfn = __pa(PAGE_OFFSET) >> PAGE_SHIFT;
- end_pfn = start_pfn + (total_memory >> PAGE_SHIFT);
- add_active_range(0, start_pfn, end_pfn);
-
- memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
-#ifdef CONFIG_HIGHMEM
- max_zone_pfns[ZONE_DMA] = total_lowmem >> PAGE_SHIFT;
- max_zone_pfns[ZONE_HIGHMEM] = total_memory >> PAGE_SHIFT;
-#else
- max_zone_pfns[ZONE_DMA] = total_memory >> PAGE_SHIFT;
-#endif /* CONFIG_HIGHMEM */
- free_area_init_nodes(max_zone_pfns);
-}
-
-void __init mem_init(void)
-{
- unsigned long addr;
- int codepages = 0;
- int datapages = 0;
- int initpages = 0;
-#ifdef CONFIG_HIGHMEM
- unsigned long highmem_mapnr;
-
- highmem_mapnr = total_lowmem >> PAGE_SHIFT;
-#endif /* CONFIG_HIGHMEM */
- max_mapnr = total_memory >> PAGE_SHIFT;
-
- high_memory = (void *) __va(PPC_MEMSTART + total_lowmem);
- num_physpages = max_mapnr; /* RAM is assumed contiguous */
-
- totalram_pages += free_all_bootmem();
-
-#ifdef CONFIG_BLK_DEV_INITRD
- /* if we are booted from BootX with an initial ramdisk,
- make sure the ramdisk pages aren't reserved. */
- if (initrd_start) {
- for (addr = initrd_start; addr < initrd_end; addr += PAGE_SIZE)
- ClearPageReserved(virt_to_page(addr));
- }
-#endif /* CONFIG_BLK_DEV_INITRD */
-
- for (addr = PAGE_OFFSET; addr < (unsigned long)high_memory;
- addr += PAGE_SIZE) {
- if (!PageReserved(virt_to_page(addr)))
- continue;
- if (addr < (ulong) etext)
- codepages++;
- else if (addr >= (unsigned long)&__init_begin
- && addr < (unsigned long)&__init_end)
- initpages++;
- else if (addr < (ulong) klimit)
- datapages++;
- }
-
-#ifdef CONFIG_HIGHMEM
- {
- unsigned long pfn;
-
- for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
- struct page *page = mem_map + pfn;
-
- ClearPageReserved(page);
- init_page_count(page);
- __free_page(page);
- totalhigh_pages++;
- }
- totalram_pages += totalhigh_pages;
- }
-#endif /* CONFIG_HIGHMEM */
-
- printk("Memory: %luk available (%dk kernel code, %dk data, %dk init, %ldk highmem)\n",
- (unsigned long)nr_free_pages()<< (PAGE_SHIFT-10),
- codepages<< (PAGE_SHIFT-10), datapages<< (PAGE_SHIFT-10),
- initpages<< (PAGE_SHIFT-10),
- (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
-
- mem_init_done = 1;
-}
-
-/*
- * Set phys_avail to the amount of physical memory,
- * less the kernel text/data/bss.
- */
-void __init
-set_phys_avail(unsigned long total_memory)
-{
- unsigned long kstart, ksize;
-
- /*
- * Initially, available physical memory is equivalent to all
- * physical memory.
- */
-
- phys_avail.regions[0].address = PPC_MEMSTART;
- phys_avail.regions[0].size = total_memory;
- phys_avail.n_regions = 1;
-
- /*
- * Map out the kernel text/data/bss from the available physical
- * memory.
- */
-
- kstart = __pa(_stext); /* should be 0 */
- ksize = PAGE_ALIGN(klimit - _stext);
-
- mem_pieces_remove(&phys_avail, kstart, ksize, 0);
- mem_pieces_remove(&phys_avail, 0, 0x4000, 0);
-
-#if defined(CONFIG_BLK_DEV_INITRD)
- /* Remove the init RAM disk from the available memory. */
- if (initrd_start) {
- mem_pieces_remove(&phys_avail, __pa(initrd_start),
- initrd_end - initrd_start, 1);
- }
-#endif /* CONFIG_BLK_DEV_INITRD */
-}
-
-/* Mark some memory as reserved by removing it from phys_avail. */
-void __init reserve_phys_mem(unsigned long start, unsigned long size)
-{
- mem_pieces_remove(&phys_avail, start, size, 1);
-}
-
-/*
- * 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)
-{
- clear_bit(PG_arch_1, &page->flags);
-}
-
-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)
- /* 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);
- clear_bit(PG_arch_1, &pg->flags);
-}
-
-void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
- struct page *pg)
-{
- copy_page(vto, vfrom);
- 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);
-}
-
-/*
- * 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.
- */
-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);
-
- if (pfn_valid(pfn)) {
- struct page *page = pfn_to_page(pfn);
-#ifdef CONFIG_8xx
- /* On 8xx, the TLB handlers work in 2 stages:
- * First, a zeroed entry is loaded by TLBMiss handler,
- * which causes the TLBError handler to be triggered.
- * That means the zeroed TLB has to be invalidated
- * whenever a page miss occurs.
- */
- _tlbie(address, 0 /* 8xx doesn't care about PID */);
-#endif
- if (!PageReserved(page)
- && !test_bit(PG_arch_1, &page->flags)) {
- if (vma->vm_mm == current->active_mm)
- __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 (Hash != 0 && pte_young(pte)) {
- struct mm_struct *mm;
- pmd_t *pmd;
-
- mm = (address < TASK_SIZE)? vma->vm_mm: &init_mm;
- pmd = pmd_offset(pgd_offset(mm, address), address);
- if (!pmd_none(*pmd))
- add_hash_page(mm->context.id, address, pmd_val(*pmd));
- }
-#endif
-}
-
-/*
- * 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)
-{
- return pfn < max_pfn;
-}
-
-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);