519 lines
14 KiB
C
519 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Initialize MMU support.
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*
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* Copyright (C) 1998-2003 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/dma-map-ops.h>
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#include <linux/dmar.h>
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#include <linux/efi.h>
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#include <linux/elf.h>
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#include <linux/memblock.h>
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#include <linux/mm.h>
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#include <linux/sched/signal.h>
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#include <linux/mmzone.h>
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#include <linux/module.h>
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#include <linux/personality.h>
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#include <linux/reboot.h>
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#include <linux/slab.h>
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#include <linux/swap.h>
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#include <linux/proc_fs.h>
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#include <linux/bitops.h>
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#include <linux/kexec.h>
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#include <linux/swiotlb.h>
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#include <asm/dma.h>
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#include <asm/efi.h>
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#include <asm/io.h>
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#include <asm/numa.h>
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#include <asm/patch.h>
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#include <asm/pgalloc.h>
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#include <asm/sal.h>
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#include <asm/sections.h>
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#include <asm/tlb.h>
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#include <linux/uaccess.h>
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#include <asm/unistd.h>
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#include <asm/mca.h>
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extern void ia64_tlb_init (void);
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unsigned long MAX_DMA_ADDRESS = PAGE_OFFSET + 0x100000000UL;
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struct page *zero_page_memmap_ptr; /* map entry for zero page */
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EXPORT_SYMBOL(zero_page_memmap_ptr);
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void
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__ia64_sync_icache_dcache (pte_t pte)
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{
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unsigned long addr;
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struct page *page;
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page = pte_page(pte);
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addr = (unsigned long) page_address(page);
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if (test_bit(PG_arch_1, &page->flags))
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return; /* i-cache is already coherent with d-cache */
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flush_icache_range(addr, addr + page_size(page));
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set_bit(PG_arch_1, &page->flags); /* mark page as clean */
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}
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/*
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* Since DMA is i-cache coherent, any (complete) pages that were written via
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* DMA can be marked as "clean" so that lazy_mmu_prot_update() doesn't have to
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* flush them when they get mapped into an executable vm-area.
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*/
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void arch_dma_mark_clean(phys_addr_t paddr, size_t size)
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{
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unsigned long pfn = PHYS_PFN(paddr);
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do {
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set_bit(PG_arch_1, &pfn_to_page(pfn)->flags);
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} while (++pfn <= PHYS_PFN(paddr + size - 1));
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}
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inline void
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ia64_set_rbs_bot (void)
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{
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unsigned long stack_size = rlimit_max(RLIMIT_STACK) & -16;
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if (stack_size > MAX_USER_STACK_SIZE)
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stack_size = MAX_USER_STACK_SIZE;
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current->thread.rbs_bot = PAGE_ALIGN(current->mm->start_stack - stack_size);
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}
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/*
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* This performs some platform-dependent address space initialization.
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* On IA-64, we want to setup the VM area for the register backing
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* store (which grows upwards) and install the gateway page which is
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* used for signal trampolines, etc.
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*/
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void
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ia64_init_addr_space (void)
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{
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struct vm_area_struct *vma;
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ia64_set_rbs_bot();
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/*
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* If we're out of memory and kmem_cache_alloc() returns NULL, we simply ignore
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* the problem. When the process attempts to write to the register backing store
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* for the first time, it will get a SEGFAULT in this case.
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*/
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vma = vm_area_alloc(current->mm);
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if (vma) {
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vma_set_anonymous(vma);
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vma->vm_start = current->thread.rbs_bot & PAGE_MASK;
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vma->vm_end = vma->vm_start + PAGE_SIZE;
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vm_flags_init(vma, VM_DATA_DEFAULT_FLAGS|VM_GROWSUP|VM_ACCOUNT);
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vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
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mmap_write_lock(current->mm);
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if (insert_vm_struct(current->mm, vma)) {
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mmap_write_unlock(current->mm);
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vm_area_free(vma);
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return;
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}
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mmap_write_unlock(current->mm);
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}
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/* map NaT-page at address zero to speed up speculative dereferencing of NULL: */
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if (!(current->personality & MMAP_PAGE_ZERO)) {
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vma = vm_area_alloc(current->mm);
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if (vma) {
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vma_set_anonymous(vma);
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vma->vm_end = PAGE_SIZE;
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vma->vm_page_prot = __pgprot(pgprot_val(PAGE_READONLY) | _PAGE_MA_NAT);
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vm_flags_init(vma, VM_READ | VM_MAYREAD | VM_IO |
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VM_DONTEXPAND | VM_DONTDUMP);
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mmap_write_lock(current->mm);
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if (insert_vm_struct(current->mm, vma)) {
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mmap_write_unlock(current->mm);
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vm_area_free(vma);
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return;
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}
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mmap_write_unlock(current->mm);
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}
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}
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}
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void
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free_initmem (void)
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{
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free_reserved_area(ia64_imva(__init_begin), ia64_imva(__init_end),
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-1, "unused kernel");
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}
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void __init
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free_initrd_mem (unsigned long start, unsigned long end)
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{
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/*
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* EFI uses 4KB pages while the kernel can use 4KB or bigger.
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* Thus EFI and the kernel may have different page sizes. It is
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* therefore possible to have the initrd share the same page as
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* the end of the kernel (given current setup).
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*
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* To avoid freeing/using the wrong page (kernel sized) we:
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* - align up the beginning of initrd
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* - align down the end of initrd
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*
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* | |
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* |=============| a000
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* | |
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* | |
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* | | 9000
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* |/////////////|
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* |/////////////|
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* |=============| 8000
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* |///INITRD////|
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* |/////////////|
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* |/////////////| 7000
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* | |
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* |KKKKKKKKKKKKK|
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* |=============| 6000
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* |KKKKKKKKKKKKK|
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* |KKKKKKKKKKKKK|
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* K=kernel using 8KB pages
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*
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* In this example, we must free page 8000 ONLY. So we must align up
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* initrd_start and keep initrd_end as is.
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*/
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start = PAGE_ALIGN(start);
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end = end & PAGE_MASK;
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if (start < end)
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printk(KERN_INFO "Freeing initrd memory: %ldkB freed\n", (end - start) >> 10);
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for (; start < end; start += PAGE_SIZE) {
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if (!virt_addr_valid(start))
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continue;
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free_reserved_page(virt_to_page(start));
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}
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}
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/*
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* This installs a clean page in the kernel's page table.
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*/
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static struct page * __init
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put_kernel_page (struct page *page, unsigned long address, pgprot_t pgprot)
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{
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pgd_t *pgd;
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p4d_t *p4d;
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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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pgd = pgd_offset_k(address); /* note: this is NOT pgd_offset()! */
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{
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p4d = p4d_alloc(&init_mm, pgd, address);
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if (!p4d)
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goto out;
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pud = pud_alloc(&init_mm, p4d, address);
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if (!pud)
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goto out;
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pmd = pmd_alloc(&init_mm, pud, address);
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if (!pmd)
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goto out;
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pte = pte_alloc_kernel(pmd, address);
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if (!pte)
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goto out;
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if (!pte_none(*pte))
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goto out;
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set_pte(pte, mk_pte(page, pgprot));
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}
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out:
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/* no need for flush_tlb */
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return page;
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}
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static void __init
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setup_gate (void)
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{
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struct page *page;
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/*
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* Map the gate page twice: once read-only to export the ELF
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* headers etc. and once execute-only page to enable
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* privilege-promotion via "epc":
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*/
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page = virt_to_page(ia64_imva(__start_gate_section));
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put_kernel_page(page, GATE_ADDR, PAGE_READONLY);
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#ifdef HAVE_BUGGY_SEGREL
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page = virt_to_page(ia64_imva(__start_gate_section + PAGE_SIZE));
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put_kernel_page(page, GATE_ADDR + PAGE_SIZE, PAGE_GATE);
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#else
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put_kernel_page(page, GATE_ADDR + PERCPU_PAGE_SIZE, PAGE_GATE);
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/* Fill in the holes (if any) with read-only zero pages: */
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{
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unsigned long addr;
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for (addr = GATE_ADDR + PAGE_SIZE;
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addr < GATE_ADDR + PERCPU_PAGE_SIZE;
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addr += PAGE_SIZE)
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{
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put_kernel_page(ZERO_PAGE(0), addr,
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PAGE_READONLY);
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put_kernel_page(ZERO_PAGE(0), addr + PERCPU_PAGE_SIZE,
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PAGE_READONLY);
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}
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}
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#endif
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ia64_patch_gate();
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}
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static struct vm_area_struct gate_vma;
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static int __init gate_vma_init(void)
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{
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vma_init(&gate_vma, NULL);
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gate_vma.vm_start = FIXADDR_USER_START;
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gate_vma.vm_end = FIXADDR_USER_END;
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vm_flags_init(&gate_vma, VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC);
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gate_vma.vm_page_prot = __pgprot(__ACCESS_BITS | _PAGE_PL_3 | _PAGE_AR_RX);
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return 0;
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}
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__initcall(gate_vma_init);
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struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
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{
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return &gate_vma;
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}
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int in_gate_area_no_mm(unsigned long addr)
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{
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if ((addr >= FIXADDR_USER_START) && (addr < FIXADDR_USER_END))
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return 1;
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return 0;
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}
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int in_gate_area(struct mm_struct *mm, unsigned long addr)
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{
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return in_gate_area_no_mm(addr);
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}
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void ia64_mmu_init(void *my_cpu_data)
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{
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unsigned long pta, impl_va_bits;
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extern void tlb_init(void);
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#ifdef CONFIG_DISABLE_VHPT
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# define VHPT_ENABLE_BIT 0
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#else
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# define VHPT_ENABLE_BIT 1
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#endif
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/*
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* Check if the virtually mapped linear page table (VMLPT) overlaps with a mapped
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* address space. The IA-64 architecture guarantees that at least 50 bits of
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* virtual address space are implemented but if we pick a large enough page size
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* (e.g., 64KB), the mapped address space is big enough that it will overlap with
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* VMLPT. I assume that once we run on machines big enough to warrant 64KB pages,
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* IMPL_VA_MSB will be significantly bigger, so this is unlikely to become a
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* problem in practice. Alternatively, we could truncate the top of the mapped
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* address space to not permit mappings that would overlap with the VMLPT.
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* --davidm 00/12/06
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*/
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# define pte_bits 3
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# define mapped_space_bits (3*(PAGE_SHIFT - pte_bits) + PAGE_SHIFT)
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/*
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* The virtual page table has to cover the entire implemented address space within
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* a region even though not all of this space may be mappable. The reason for
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* this is that the Access bit and Dirty bit fault handlers perform
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* non-speculative accesses to the virtual page table, so the address range of the
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* virtual page table itself needs to be covered by virtual page table.
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*/
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# define vmlpt_bits (impl_va_bits - PAGE_SHIFT + pte_bits)
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# define POW2(n) (1ULL << (n))
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impl_va_bits = ffz(~(local_cpu_data->unimpl_va_mask | (7UL << 61)));
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if (impl_va_bits < 51 || impl_va_bits > 61)
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panic("CPU has bogus IMPL_VA_MSB value of %lu!\n", impl_va_bits - 1);
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/*
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* mapped_space_bits - PAGE_SHIFT is the total number of ptes we need,
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* which must fit into "vmlpt_bits - pte_bits" slots. Second half of
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* the test makes sure that our mapped space doesn't overlap the
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* unimplemented hole in the middle of the region.
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*/
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if ((mapped_space_bits - PAGE_SHIFT > vmlpt_bits - pte_bits) ||
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(mapped_space_bits > impl_va_bits - 1))
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panic("Cannot build a big enough virtual-linear page table"
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" to cover mapped address space.\n"
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" Try using a smaller page size.\n");
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/* place the VMLPT at the end of each page-table mapped region: */
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pta = POW2(61) - POW2(vmlpt_bits);
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/*
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* Set the (virtually mapped linear) page table address. Bit
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* 8 selects between the short and long format, bits 2-7 the
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* size of the table, and bit 0 whether the VHPT walker is
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* enabled.
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*/
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ia64_set_pta(pta | (0 << 8) | (vmlpt_bits << 2) | VHPT_ENABLE_BIT);
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ia64_tlb_init();
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#ifdef CONFIG_HUGETLB_PAGE
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ia64_set_rr(HPAGE_REGION_BASE, HPAGE_SHIFT << 2);
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ia64_srlz_d();
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#endif
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}
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int __init register_active_ranges(u64 start, u64 len, int nid)
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{
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u64 end = start + len;
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#ifdef CONFIG_KEXEC
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if (start > crashk_res.start && start < crashk_res.end)
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start = crashk_res.end;
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if (end > crashk_res.start && end < crashk_res.end)
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end = crashk_res.start;
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#endif
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if (start < end)
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memblock_add_node(__pa(start), end - start, nid, MEMBLOCK_NONE);
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return 0;
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}
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int
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find_max_min_low_pfn (u64 start, u64 end, void *arg)
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{
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unsigned long pfn_start, pfn_end;
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#ifdef CONFIG_FLATMEM
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pfn_start = (PAGE_ALIGN(__pa(start))) >> PAGE_SHIFT;
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pfn_end = (PAGE_ALIGN(__pa(end - 1))) >> PAGE_SHIFT;
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#else
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pfn_start = GRANULEROUNDDOWN(__pa(start)) >> PAGE_SHIFT;
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pfn_end = GRANULEROUNDUP(__pa(end - 1)) >> PAGE_SHIFT;
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#endif
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min_low_pfn = min(min_low_pfn, pfn_start);
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max_low_pfn = max(max_low_pfn, pfn_end);
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return 0;
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}
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/*
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* Boot command-line option "nolwsys" can be used to disable the use of any light-weight
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* system call handler. When this option is in effect, all fsyscalls will end up bubbling
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* down into the kernel and calling the normal (heavy-weight) syscall handler. This is
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* useful for performance testing, but conceivably could also come in handy for debugging
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* purposes.
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*/
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static int nolwsys __initdata;
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static int __init
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nolwsys_setup (char *s)
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{
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nolwsys = 1;
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return 1;
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}
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__setup("nolwsys", nolwsys_setup);
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void __init
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mem_init (void)
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{
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int i;
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BUG_ON(PTRS_PER_PGD * sizeof(pgd_t) != PAGE_SIZE);
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BUG_ON(PTRS_PER_PMD * sizeof(pmd_t) != PAGE_SIZE);
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BUG_ON(PTRS_PER_PTE * sizeof(pte_t) != PAGE_SIZE);
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/*
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* This needs to be called _after_ the command line has been parsed but
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* _before_ any drivers that may need the PCI DMA interface are
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* initialized or bootmem has been freed.
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*/
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do {
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#ifdef CONFIG_INTEL_IOMMU
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detect_intel_iommu();
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if (iommu_detected)
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break;
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#endif
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swiotlb_init(true, SWIOTLB_VERBOSE);
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} while (0);
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#ifdef CONFIG_FLATMEM
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BUG_ON(!mem_map);
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#endif
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set_max_mapnr(max_low_pfn);
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high_memory = __va(max_low_pfn * PAGE_SIZE);
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memblock_free_all();
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/*
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* For fsyscall entrypoints with no light-weight handler, use the ordinary
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* (heavy-weight) handler, but mark it by setting bit 0, so the fsyscall entry
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* code can tell them apart.
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*/
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for (i = 0; i < NR_syscalls; ++i) {
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extern unsigned long fsyscall_table[NR_syscalls];
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extern unsigned long sys_call_table[NR_syscalls];
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if (!fsyscall_table[i] || nolwsys)
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fsyscall_table[i] = sys_call_table[i] | 1;
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}
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setup_gate();
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}
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#ifdef CONFIG_MEMORY_HOTPLUG
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int arch_add_memory(int nid, u64 start, u64 size,
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struct mhp_params *params)
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{
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unsigned long start_pfn = start >> PAGE_SHIFT;
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unsigned long nr_pages = size >> PAGE_SHIFT;
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int ret;
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if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot))
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return -EINVAL;
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ret = __add_pages(nid, start_pfn, nr_pages, params);
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if (ret)
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printk("%s: Problem encountered in __add_pages() as ret=%d\n",
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__func__, ret);
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return ret;
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}
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void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
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{
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unsigned long start_pfn = start >> PAGE_SHIFT;
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unsigned long nr_pages = size >> PAGE_SHIFT;
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__remove_pages(start_pfn, nr_pages, altmap);
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}
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#endif
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static const pgprot_t protection_map[16] = {
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[VM_NONE] = PAGE_NONE,
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[VM_READ] = PAGE_READONLY,
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|
[VM_WRITE] = PAGE_READONLY,
|
|
[VM_WRITE | VM_READ] = PAGE_READONLY,
|
|
[VM_EXEC] = __pgprot(__ACCESS_BITS | _PAGE_PL_3 |
|
|
_PAGE_AR_X_RX),
|
|
[VM_EXEC | VM_READ] = __pgprot(__ACCESS_BITS | _PAGE_PL_3 |
|
|
_PAGE_AR_RX),
|
|
[VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC,
|
|
[VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_EXEC,
|
|
[VM_SHARED] = PAGE_NONE,
|
|
[VM_SHARED | VM_READ] = PAGE_READONLY,
|
|
[VM_SHARED | VM_WRITE] = PAGE_SHARED,
|
|
[VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
|
|
[VM_SHARED | VM_EXEC] = __pgprot(__ACCESS_BITS | _PAGE_PL_3 |
|
|
_PAGE_AR_X_RX),
|
|
[VM_SHARED | VM_EXEC | VM_READ] = __pgprot(__ACCESS_BITS | _PAGE_PL_3 |
|
|
_PAGE_AR_RX),
|
|
[VM_SHARED | VM_EXEC | VM_WRITE] = __pgprot(__ACCESS_BITS | _PAGE_PL_3 |
|
|
_PAGE_AR_RWX),
|
|
[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = __pgprot(__ACCESS_BITS | _PAGE_PL_3 |
|
|
_PAGE_AR_RWX)
|
|
};
|
|
DECLARE_VM_GET_PAGE_PROT
|