482 lines
12 KiB
C
482 lines
12 KiB
C
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994 - 2000 Ralf Baechle
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* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
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* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
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*/
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#include <linux/bug.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/smp.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/pagemap.h>
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#include <linux/ptrace.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/highmem.h>
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#include <linux/swap.h>
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#include <linux/proc_fs.h>
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#include <linux/pfn.h>
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#include <linux/hardirq.h>
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#include <asm/asm-offsets.h>
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#include <asm/bootinfo.h>
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#include <asm/cachectl.h>
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#include <asm/cpu.h>
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#include <asm/dma.h>
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#include <asm/kmap_types.h>
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#include <asm/mmu_context.h>
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#include <asm/sections.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/tlb.h>
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#include <asm/fixmap.h>
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/* Atomicity and interruptability */
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#ifdef CONFIG_MIPS_MT_SMTC
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#include <asm/mipsmtregs.h>
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#define ENTER_CRITICAL(flags) \
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{ \
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unsigned int mvpflags; \
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local_irq_save(flags);\
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mvpflags = dvpe()
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#define EXIT_CRITICAL(flags) \
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evpe(mvpflags); \
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local_irq_restore(flags); \
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}
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#else
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#define ENTER_CRITICAL(flags) local_irq_save(flags)
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#define EXIT_CRITICAL(flags) local_irq_restore(flags)
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#endif /* CONFIG_MIPS_MT_SMTC */
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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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/*
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* We have up to 8 empty zeroed pages so we can map one of the right colour
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* when needed. This is necessary only on R4000 / R4400 SC and MC versions
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* where we have to avoid VCED / VECI exceptions for good performance at
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* any price. Since page is never written to after the initialization we
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* don't have to care about aliases on other CPUs.
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*/
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unsigned long empty_zero_page, zero_page_mask;
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EXPORT_SYMBOL_GPL(empty_zero_page);
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/*
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* Not static inline because used by IP27 special magic initialization code
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*/
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unsigned long setup_zero_pages(void)
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{
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unsigned int order;
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unsigned long size;
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struct page *page;
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if (cpu_has_vce)
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order = 3;
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else
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order = 0;
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empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
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if (!empty_zero_page)
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panic("Oh boy, that early out of memory?");
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page = virt_to_page((void *)empty_zero_page);
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split_page(page, order);
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while (page < virt_to_page((void *)(empty_zero_page + (PAGE_SIZE << order)))) {
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SetPageReserved(page);
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page++;
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}
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size = PAGE_SIZE << order;
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zero_page_mask = (size - 1) & PAGE_MASK;
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return 1UL << order;
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}
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#ifdef CONFIG_MIPS_MT_SMTC
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static pte_t *kmap_coherent_pte;
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static void __init kmap_coherent_init(void)
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{
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unsigned long vaddr;
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/* cache the first coherent kmap pte */
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vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
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kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
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}
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#else
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static inline void kmap_coherent_init(void) {}
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#endif
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void *kmap_coherent(struct page *page, unsigned long addr)
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{
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enum fixed_addresses idx;
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unsigned long vaddr, flags, entrylo;
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unsigned long old_ctx;
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pte_t pte;
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int tlbidx;
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BUG_ON(Page_dcache_dirty(page));
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inc_preempt_count();
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idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
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#ifdef CONFIG_MIPS_MT_SMTC
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idx += FIX_N_COLOURS * smp_processor_id() +
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(in_interrupt() ? (FIX_N_COLOURS * NR_CPUS) : 0);
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#else
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idx += in_interrupt() ? FIX_N_COLOURS : 0;
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#endif
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vaddr = __fix_to_virt(FIX_CMAP_END - idx);
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pte = mk_pte(page, PAGE_KERNEL);
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#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
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entrylo = pte.pte_high;
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#else
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entrylo = pte_val(pte) >> 6;
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#endif
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ENTER_CRITICAL(flags);
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old_ctx = read_c0_entryhi();
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write_c0_entryhi(vaddr & (PAGE_MASK << 1));
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write_c0_entrylo0(entrylo);
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write_c0_entrylo1(entrylo);
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#ifdef CONFIG_MIPS_MT_SMTC
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set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
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/* preload TLB instead of local_flush_tlb_one() */
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mtc0_tlbw_hazard();
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tlb_probe();
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tlb_probe_hazard();
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tlbidx = read_c0_index();
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mtc0_tlbw_hazard();
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if (tlbidx < 0)
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tlb_write_random();
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else
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tlb_write_indexed();
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#else
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tlbidx = read_c0_wired();
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write_c0_wired(tlbidx + 1);
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write_c0_index(tlbidx);
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mtc0_tlbw_hazard();
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tlb_write_indexed();
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#endif
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tlbw_use_hazard();
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write_c0_entryhi(old_ctx);
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EXIT_CRITICAL(flags);
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return (void*) vaddr;
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}
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#define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
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void kunmap_coherent(void)
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{
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#ifndef CONFIG_MIPS_MT_SMTC
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unsigned int wired;
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unsigned long flags, old_ctx;
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ENTER_CRITICAL(flags);
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old_ctx = read_c0_entryhi();
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wired = read_c0_wired() - 1;
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write_c0_wired(wired);
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write_c0_index(wired);
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write_c0_entryhi(UNIQUE_ENTRYHI(wired));
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write_c0_entrylo0(0);
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write_c0_entrylo1(0);
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mtc0_tlbw_hazard();
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tlb_write_indexed();
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tlbw_use_hazard();
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write_c0_entryhi(old_ctx);
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EXIT_CRITICAL(flags);
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#endif
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dec_preempt_count();
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preempt_check_resched();
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}
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void copy_user_highpage(struct page *to, struct page *from,
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unsigned long vaddr, struct vm_area_struct *vma)
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{
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void *vfrom, *vto;
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vto = kmap_atomic(to, KM_USER1);
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if (cpu_has_dc_aliases &&
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page_mapped(from) && !Page_dcache_dirty(from)) {
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vfrom = kmap_coherent(from, vaddr);
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copy_page(vto, vfrom);
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kunmap_coherent();
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} else {
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vfrom = kmap_atomic(from, KM_USER0);
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copy_page(vto, vfrom);
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kunmap_atomic(vfrom, KM_USER0);
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}
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if ((!cpu_has_ic_fills_f_dc) ||
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pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
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flush_data_cache_page((unsigned long)vto);
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kunmap_atomic(vto, KM_USER1);
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/* Make sure this page is cleared on other CPU's too before using it */
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smp_wmb();
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}
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void copy_to_user_page(struct vm_area_struct *vma,
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struct page *page, unsigned long vaddr, void *dst, const void *src,
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unsigned long len)
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{
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if (cpu_has_dc_aliases &&
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page_mapped(page) && !Page_dcache_dirty(page)) {
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void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
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memcpy(vto, src, len);
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kunmap_coherent();
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} else {
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memcpy(dst, src, len);
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if (cpu_has_dc_aliases)
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SetPageDcacheDirty(page);
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}
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if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
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flush_cache_page(vma, vaddr, page_to_pfn(page));
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}
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void copy_from_user_page(struct vm_area_struct *vma,
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struct page *page, unsigned long vaddr, void *dst, const void *src,
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unsigned long len)
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{
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if (cpu_has_dc_aliases &&
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page_mapped(page) && !Page_dcache_dirty(page)) {
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void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
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memcpy(dst, vfrom, len);
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kunmap_coherent();
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} else {
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memcpy(dst, src, len);
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if (cpu_has_dc_aliases)
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SetPageDcacheDirty(page);
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}
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}
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void __init fixrange_init(unsigned long start, unsigned long end,
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pgd_t *pgd_base)
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{
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#if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte;
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int i, j, k;
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unsigned long vaddr;
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vaddr = start;
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i = __pgd_offset(vaddr);
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j = __pud_offset(vaddr);
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k = __pmd_offset(vaddr);
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pgd = pgd_base + i;
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for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
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pud = (pud_t *)pgd;
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for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
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pmd = (pmd_t *)pud;
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for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
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if (pmd_none(*pmd)) {
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pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
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set_pmd(pmd, __pmd((unsigned long)pte));
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BUG_ON(pte != pte_offset_kernel(pmd, 0));
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}
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vaddr += PMD_SIZE;
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}
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k = 0;
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}
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j = 0;
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}
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#endif
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}
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#ifndef CONFIG_NEED_MULTIPLE_NODES
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static int __init page_is_ram(unsigned long pagenr)
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{
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int i;
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for (i = 0; i < boot_mem_map.nr_map; i++) {
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unsigned long addr, end;
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if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
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/* not usable memory */
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continue;
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addr = PFN_UP(boot_mem_map.map[i].addr);
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end = PFN_DOWN(boot_mem_map.map[i].addr +
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boot_mem_map.map[i].size);
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if (pagenr >= addr && pagenr < end)
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return 1;
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}
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return 0;
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}
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void __init paging_init(void)
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{
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unsigned long max_zone_pfns[MAX_NR_ZONES];
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unsigned long lastpfn;
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pagetable_init();
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#ifdef CONFIG_HIGHMEM
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kmap_init();
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#endif
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kmap_coherent_init();
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#ifdef CONFIG_ZONE_DMA
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max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
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#endif
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#ifdef CONFIG_ZONE_DMA32
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max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
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#endif
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max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
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lastpfn = max_low_pfn;
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#ifdef CONFIG_HIGHMEM
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max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
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lastpfn = highend_pfn;
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if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
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printk(KERN_WARNING "This processor doesn't support highmem."
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" %ldk highmem ignored\n",
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(highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
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max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
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lastpfn = max_low_pfn;
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}
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#endif
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free_area_init_nodes(max_zone_pfns);
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}
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#ifdef CONFIG_64BIT
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static struct kcore_list kcore_kseg0;
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#endif
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|
|
||
|
|
void __init mem_init(void)
|
||
|
|
{
|
||
|
|
unsigned long codesize, reservedpages, datasize, initsize;
|
||
|
|
unsigned long tmp, ram;
|
||
|
|
|
||
|
|
#ifdef CONFIG_HIGHMEM
|
||
|
|
#ifdef CONFIG_DISCONTIGMEM
|
||
|
|
#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
|
||
|
|
#endif
|
||
|
|
max_mapnr = highend_pfn;
|
||
|
|
#else
|
||
|
|
max_mapnr = max_low_pfn;
|
||
|
|
#endif
|
||
|
|
high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
|
||
|
|
|
||
|
|
totalram_pages += free_all_bootmem();
|
||
|
|
totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
|
||
|
|
|
||
|
|
reservedpages = ram = 0;
|
||
|
|
for (tmp = 0; tmp < max_low_pfn; tmp++)
|
||
|
|
if (page_is_ram(tmp)) {
|
||
|
|
ram++;
|
||
|
|
if (PageReserved(pfn_to_page(tmp)))
|
||
|
|
reservedpages++;
|
||
|
|
}
|
||
|
|
num_physpages = ram;
|
||
|
|
|
||
|
|
#ifdef CONFIG_HIGHMEM
|
||
|
|
for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
|
||
|
|
struct page *page = pfn_to_page(tmp);
|
||
|
|
|
||
|
|
if (!page_is_ram(tmp)) {
|
||
|
|
SetPageReserved(page);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
ClearPageReserved(page);
|
||
|
|
init_page_count(page);
|
||
|
|
__free_page(page);
|
||
|
|
totalhigh_pages++;
|
||
|
|
}
|
||
|
|
totalram_pages += totalhigh_pages;
|
||
|
|
num_physpages += totalhigh_pages;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
codesize = (unsigned long) &_etext - (unsigned long) &_text;
|
||
|
|
datasize = (unsigned long) &_edata - (unsigned long) &_etext;
|
||
|
|
initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
|
||
|
|
|
||
|
|
#ifdef CONFIG_64BIT
|
||
|
|
if ((unsigned long) &_text > (unsigned long) CKSEG0)
|
||
|
|
/* The -4 is a hack so that user tools don't have to handle
|
||
|
|
the overflow. */
|
||
|
|
kclist_add(&kcore_kseg0, (void *) CKSEG0,
|
||
|
|
0x80000000 - 4, KCORE_TEXT);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
|
||
|
|
"%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
|
||
|
|
nr_free_pages() << (PAGE_SHIFT-10),
|
||
|
|
ram << (PAGE_SHIFT-10),
|
||
|
|
codesize >> 10,
|
||
|
|
reservedpages << (PAGE_SHIFT-10),
|
||
|
|
datasize >> 10,
|
||
|
|
initsize >> 10,
|
||
|
|
(unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
|
||
|
|
}
|
||
|
|
#endif /* !CONFIG_NEED_MULTIPLE_NODES */
|
||
|
|
|
||
|
|
void free_init_pages(const char *what, unsigned long begin, unsigned long end)
|
||
|
|
{
|
||
|
|
unsigned long pfn;
|
||
|
|
|
||
|
|
for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
|
||
|
|
struct page *page = pfn_to_page(pfn);
|
||
|
|
void *addr = phys_to_virt(PFN_PHYS(pfn));
|
||
|
|
|
||
|
|
ClearPageReserved(page);
|
||
|
|
init_page_count(page);
|
||
|
|
memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
|
||
|
|
__free_page(page);
|
||
|
|
totalram_pages++;
|
||
|
|
}
|
||
|
|
printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
||
|
|
void free_initrd_mem(unsigned long start, unsigned long end)
|
||
|
|
{
|
||
|
|
free_init_pages("initrd memory",
|
||
|
|
virt_to_phys((void *)start),
|
||
|
|
virt_to_phys((void *)end));
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
void __init_refok free_initmem(void)
|
||
|
|
{
|
||
|
|
prom_free_prom_memory();
|
||
|
|
free_init_pages("unused kernel memory",
|
||
|
|
__pa_symbol(&__init_begin),
|
||
|
|
__pa_symbol(&__init_end));
|
||
|
|
}
|
||
|
|
|
||
|
|
unsigned long pgd_current[NR_CPUS];
|
||
|
|
/*
|
||
|
|
* On 64-bit we've got three-level pagetables with a slightly
|
||
|
|
* different layout ...
|
||
|
|
*/
|
||
|
|
#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
|
||
|
|
|
||
|
|
/*
|
||
|
|
* gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
|
||
|
|
* are constants. So we use the variants from asm-offset.h until that gcc
|
||
|
|
* will officially be retired.
|
||
|
|
*/
|
||
|
|
pgd_t swapper_pg_dir[_PTRS_PER_PGD] __page_aligned(_PGD_ORDER);
|
||
|
|
#ifdef CONFIG_64BIT
|
||
|
|
pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned(PMD_ORDER);
|
||
|
|
#endif
|
||
|
|
pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
|