forked from luck/tmp_suning_uos_patched
058effe7fd
The paging_init() function contains code which detects that highmem is in use but unsupported due to dcache aliasing. However this code was ineffective because it was being run before the caches are probed, meaning that cpu_has_dc_aliases would always evaluate to false (unless a platform overrides it to a compile-time constant) and the detection of the unsupported case is never triggered. The kernel would then go on to attempt to use highmem & either hit coherency issues or trigger the BUG_ON in flush_kernel_dcache_page(). Fix this by running paging_init() later than cpu_cache_init(), such that the cpu_has_dc_aliases macro will evaluate correctly & the unsupported highmem case will be detected successfully. This then leads to a formerly hidden issue in that mem_init_free_highmem() will attempt to free all highmem pages, even though we're avoiding use of them & don't have valid page structs for them. This leads to an invalid pointer dereference & a TLB exception. Avoid this by skipping the loop in mem_init_free_highmem() if cpu_has_dc_aliases evaluates true. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Cc: Rabin Vincent <rabinv@axis.com> Cc: Matt Redfearn <matt.redfearn@imgtec.com> Cc: Jerome Marchand <jmarchan@redhat.com> Cc: Alexander Sverdlin <alexander.sverdlin@gmail.com> Cc: Aurelien Jarno <aurelien@aurel32.net> Cc: Jaedon Shin <jaedon.shin@gmail.com> Cc: Toshi Kani <toshi.kani@hpe.com> Cc: James Hogan <james.hogan@imgtec.com> Cc: Sergey Ryazanov <ryazanov.s.a@gmail.com> Cc: Jonas Gorski <jogo@openwrt.org> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/14184/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
543 lines
13 KiB
C
543 lines
13 KiB
C
/*
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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 <linux/gfp.h>
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#include <linux/kcore.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/maar.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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#include <asm/maar.h>
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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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EXPORT_SYMBOL(zero_page_mask);
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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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void setup_zero_pages(void)
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{
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unsigned int order, i;
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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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for (i = 0; i < (1 << order); i++, page++)
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mark_page_reserved(page);
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zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
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}
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static void *__kmap_pgprot(struct page *page, unsigned long addr, pgprot_t prot)
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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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preempt_disable();
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pagefault_disable();
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idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
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idx += in_interrupt() ? FIX_N_COLOURS : 0;
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vaddr = __fix_to_virt(FIX_CMAP_END - idx);
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pte = mk_pte(page, prot);
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#if defined(CONFIG_XPA)
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entrylo = pte_to_entrylo(pte.pte_high);
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#elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
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entrylo = pte.pte_high;
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#else
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entrylo = pte_to_entrylo(pte_val(pte));
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#endif
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local_irq_save(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_XPA
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if (cpu_has_xpa) {
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entrylo = (pte.pte_low & _PFNX_MASK);
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writex_c0_entrylo0(entrylo);
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writex_c0_entrylo1(entrylo);
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}
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#endif
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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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tlbw_use_hazard();
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write_c0_entryhi(old_ctx);
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local_irq_restore(flags);
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return (void*) vaddr;
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}
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void *kmap_coherent(struct page *page, unsigned long addr)
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{
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return __kmap_pgprot(page, addr, PAGE_KERNEL);
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}
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void *kmap_noncoherent(struct page *page, unsigned long addr)
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{
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return __kmap_pgprot(page, addr, PAGE_KERNEL_NC);
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}
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void kunmap_coherent(void)
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{
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unsigned int wired;
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unsigned long flags, old_ctx;
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local_irq_save(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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local_irq_restore(flags);
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pagefault_enable();
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preempt_enable();
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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);
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if (cpu_has_dc_aliases &&
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page_mapcount(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);
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copy_page(vto, vfrom);
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kunmap_atomic(vfrom);
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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);
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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_mapcount(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)
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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_mapcount(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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EXPORT_SYMBOL_GPL(copy_from_user_page);
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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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#ifdef CONFIG_HIGHMEM
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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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unsigned __weak platform_maar_init(unsigned num_pairs)
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{
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struct maar_config cfg[BOOT_MEM_MAP_MAX];
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unsigned i, num_configured, num_cfg = 0;
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for (i = 0; i < boot_mem_map.nr_map; i++) {
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switch (boot_mem_map.map[i].type) {
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case BOOT_MEM_RAM:
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case BOOT_MEM_INIT_RAM:
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break;
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default:
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continue;
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}
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/* Round lower up */
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cfg[num_cfg].lower = boot_mem_map.map[i].addr;
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cfg[num_cfg].lower = (cfg[num_cfg].lower + 0xffff) & ~0xffff;
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/* Round upper down */
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cfg[num_cfg].upper = boot_mem_map.map[i].addr +
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boot_mem_map.map[i].size;
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cfg[num_cfg].upper = (cfg[num_cfg].upper & ~0xffff) - 1;
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cfg[num_cfg].attrs = MIPS_MAAR_S;
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num_cfg++;
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}
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num_configured = maar_config(cfg, num_cfg, num_pairs);
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if (num_configured < num_cfg)
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pr_warn("Not enough MAAR pairs (%u) for all bootmem regions (%u)\n",
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num_pairs, num_cfg);
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return num_configured;
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}
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void maar_init(void)
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{
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unsigned num_maars, used, i;
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phys_addr_t lower, upper, attr;
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static struct {
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struct maar_config cfgs[3];
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unsigned used;
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} recorded = { { { 0 } }, 0 };
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if (!cpu_has_maar)
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return;
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/* Detect the number of MAARs */
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write_c0_maari(~0);
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back_to_back_c0_hazard();
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num_maars = read_c0_maari() + 1;
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/* MAARs should be in pairs */
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WARN_ON(num_maars % 2);
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/* Set MAARs using values we recorded already */
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if (recorded.used) {
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used = maar_config(recorded.cfgs, recorded.used, num_maars / 2);
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BUG_ON(used != recorded.used);
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} else {
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/* Configure the required MAARs */
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used = platform_maar_init(num_maars / 2);
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}
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/* Disable any further MAARs */
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for (i = (used * 2); i < num_maars; i++) {
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write_c0_maari(i);
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back_to_back_c0_hazard();
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write_c0_maar(0);
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back_to_back_c0_hazard();
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}
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if (recorded.used)
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return;
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pr_info("MAAR configuration:\n");
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for (i = 0; i < num_maars; i += 2) {
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write_c0_maari(i);
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back_to_back_c0_hazard();
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upper = read_c0_maar();
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write_c0_maari(i + 1);
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back_to_back_c0_hazard();
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lower = read_c0_maar();
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attr = lower & upper;
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lower = (lower & MIPS_MAAR_ADDR) << 4;
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upper = ((upper & MIPS_MAAR_ADDR) << 4) | 0xffff;
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pr_info(" [%d]: ", i / 2);
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if (!(attr & MIPS_MAAR_V)) {
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pr_cont("disabled\n");
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continue;
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}
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pr_cont("%pa-%pa", &lower, &upper);
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if (attr & MIPS_MAAR_S)
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pr_cont(" speculate");
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pr_cont("\n");
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/* Record the setup for use on secondary CPUs */
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if (used <= ARRAY_SIZE(recorded.cfgs)) {
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recorded.cfgs[recorded.used].lower = lower;
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recorded.cfgs[recorded.used].upper = upper;
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recorded.cfgs[recorded.used].attrs = attr;
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recorded.used++;
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}
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}
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}
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#ifndef CONFIG_NEED_MULTIPLE_NODES
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int 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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switch (boot_mem_map.map[i].type) {
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case BOOT_MEM_RAM:
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case BOOT_MEM_INIT_RAM:
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break;
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default:
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/* not usable memory */
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continue;
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}
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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 __maybe_unused;
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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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#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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static inline void mem_init_free_highmem(void)
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{
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#ifdef CONFIG_HIGHMEM
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unsigned long tmp;
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if (cpu_has_dc_aliases)
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return;
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for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
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struct page *page = pfn_to_page(tmp);
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if (!page_is_ram(tmp))
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SetPageReserved(page);
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else
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free_highmem_page(page);
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}
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#endif
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}
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void __init mem_init(void)
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{
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#ifdef CONFIG_HIGHMEM
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#ifdef CONFIG_DISCONTIGMEM
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#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
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#endif
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max_mapnr = highend_pfn ? highend_pfn : max_low_pfn;
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#else
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max_mapnr = max_low_pfn;
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#endif
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high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
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maar_init();
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free_all_bootmem();
|
|
setup_zero_pages(); /* Setup zeroed pages. */
|
|
mem_init_free_highmem();
|
|
mem_init_print_info(NULL);
|
|
|
|
#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
|
|
}
|
|
#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));
|
|
|
|
memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
|
|
free_reserved_page(page);
|
|
}
|
|
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_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
|
|
"initrd");
|
|
}
|
|
#endif
|
|
|
|
void (*free_init_pages_eva)(void *begin, void *end) = NULL;
|
|
|
|
void __ref free_initmem(void)
|
|
{
|
|
prom_free_prom_memory();
|
|
/*
|
|
* Let the platform define a specific function to free the
|
|
* init section since EVA may have used any possible mapping
|
|
* between virtual and physical addresses.
|
|
*/
|
|
if (free_init_pages_eva)
|
|
free_init_pages_eva((void *)&__init_begin, (void *)&__init_end);
|
|
else
|
|
free_initmem_default(POISON_FREE_INITMEM);
|
|
}
|
|
|
|
#ifndef CONFIG_MIPS_PGD_C0_CONTEXT
|
|
unsigned long pgd_current[NR_CPUS];
|
|
#endif
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* Align swapper_pg_dir in to 64K, allows its address to be loaded
|
|
* with a single LUI instruction in the TLB handlers. If we used
|
|
* __aligned(64K), its size would get rounded up to the alignment
|
|
* size, and waste space. So we place it in its own section and align
|
|
* it in the linker script.
|
|
*/
|
|
pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
|
|
#ifndef __PAGETABLE_PMD_FOLDED
|
|
pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
|
|
#endif
|
|
pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
|