diff options
Diffstat (limited to 'arch/ppc/mm/init.c')
| -rw-r--r-- | arch/ppc/mm/init.c | 603 |
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); |