258 lines
6.8 KiB
C
258 lines
6.8 KiB
C
/*
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* Copyright (C) 2012 Regents of the University of California
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/memblock.h>
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#include <linux/initrd.h>
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#include <linux/swap.h>
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#include <linux/sizes.h>
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#include <linux/of_fdt.h>
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#include <asm/fixmap.h>
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#include <asm/tlbflush.h>
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#include <asm/sections.h>
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#include <asm/pgtable.h>
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#include <asm/io.h>
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unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
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__page_aligned_bss;
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EXPORT_SYMBOL(empty_zero_page);
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static void __init zone_sizes_init(void)
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{
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unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
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#ifdef CONFIG_ZONE_DMA32
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max_zone_pfns[ZONE_DMA32] = PFN_DOWN(min(4UL * SZ_1G,
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(unsigned long) PFN_PHYS(max_low_pfn)));
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#endif
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max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
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free_area_init_nodes(max_zone_pfns);
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}
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void setup_zero_page(void)
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{
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memset((void *)empty_zero_page, 0, PAGE_SIZE);
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}
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void __init paging_init(void)
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{
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setup_zero_page();
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local_flush_tlb_all();
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zone_sizes_init();
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}
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void __init mem_init(void)
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{
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#ifdef CONFIG_FLATMEM
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BUG_ON(!mem_map);
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#endif /* CONFIG_FLATMEM */
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high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
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memblock_free_all();
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mem_init_print_info(NULL);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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static void __init setup_initrd(void)
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{
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unsigned long size;
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if (initrd_start >= initrd_end) {
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pr_info("initrd not found or empty");
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goto disable;
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}
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if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
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pr_err("initrd extends beyond end of memory");
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goto disable;
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}
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size = initrd_end - initrd_start;
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memblock_reserve(__pa(initrd_start), size);
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initrd_below_start_ok = 1;
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pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
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(void *)(initrd_start), size);
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return;
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disable:
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pr_cont(" - disabling initrd\n");
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initrd_start = 0;
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initrd_end = 0;
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}
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void __init free_initrd_mem(unsigned long start, unsigned long end)
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{
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free_reserved_area((void *)start, (void *)end, -1, "initrd");
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}
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#endif /* CONFIG_BLK_DEV_INITRD */
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void __init setup_bootmem(void)
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{
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struct memblock_region *reg;
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phys_addr_t mem_size = 0;
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/* Find the memory region containing the kernel */
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for_each_memblock(memory, reg) {
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phys_addr_t vmlinux_end = __pa(_end);
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phys_addr_t end = reg->base + reg->size;
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if (reg->base <= vmlinux_end && vmlinux_end <= end) {
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/*
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* Reserve from the start of the region to the end of
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* the kernel
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*/
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memblock_reserve(reg->base, vmlinux_end - reg->base);
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mem_size = min(reg->size, (phys_addr_t)-PAGE_OFFSET);
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/*
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* Remove memblock from the end of usable area to the
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* end of region
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*/
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if (reg->base + mem_size < end)
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memblock_remove(reg->base + mem_size,
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end - reg->base - mem_size);
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}
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}
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BUG_ON(mem_size == 0);
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set_max_mapnr(PFN_DOWN(mem_size));
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max_low_pfn = PFN_DOWN(memblock_end_of_DRAM());
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#ifdef CONFIG_BLK_DEV_INITRD
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setup_initrd();
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#endif /* CONFIG_BLK_DEV_INITRD */
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early_init_fdt_reserve_self();
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early_init_fdt_scan_reserved_mem();
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memblock_allow_resize();
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memblock_dump_all();
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for_each_memblock(memory, reg) {
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unsigned long start_pfn = memblock_region_memory_base_pfn(reg);
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unsigned long end_pfn = memblock_region_memory_end_pfn(reg);
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memblock_set_node(PFN_PHYS(start_pfn),
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PFN_PHYS(end_pfn - start_pfn),
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&memblock.memory, 0);
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}
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}
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unsigned long va_pa_offset;
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EXPORT_SYMBOL(va_pa_offset);
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unsigned long pfn_base;
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EXPORT_SYMBOL(pfn_base);
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pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
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pgd_t trampoline_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
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#ifndef __PAGETABLE_PMD_FOLDED
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#define NUM_SWAPPER_PMDS ((uintptr_t)-PAGE_OFFSET >> PGDIR_SHIFT)
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pmd_t swapper_pmd[PTRS_PER_PMD*((-PAGE_OFFSET)/PGDIR_SIZE)] __page_aligned_bss;
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pmd_t trampoline_pmd[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
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pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
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#endif
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pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
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void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
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{
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unsigned long addr = __fix_to_virt(idx);
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pte_t *ptep;
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BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
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ptep = &fixmap_pte[pte_index(addr)];
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if (pgprot_val(prot)) {
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set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
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} else {
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pte_clear(&init_mm, addr, ptep);
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local_flush_tlb_page(addr);
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}
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}
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/*
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* setup_vm() is called from head.S with MMU-off.
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*
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* Following requirements should be honoured for setup_vm() to work
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* correctly:
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* 1) It should use PC-relative addressing for accessing kernel symbols.
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* To achieve this we always use GCC cmodel=medany.
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* 2) The compiler instrumentation for FTRACE will not work for setup_vm()
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* so disable compiler instrumentation when FTRACE is enabled.
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*
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* Currently, the above requirements are honoured by using custom CFLAGS
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* for init.o in mm/Makefile.
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*/
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#ifndef __riscv_cmodel_medany
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#error "setup_vm() is called from head.S before relocate so it should "
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"not use absolute addressing."
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#endif
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asmlinkage void __init setup_vm(void)
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{
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extern char _start;
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uintptr_t i;
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uintptr_t pa = (uintptr_t) &_start;
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pgprot_t prot = __pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_EXEC);
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va_pa_offset = PAGE_OFFSET - pa;
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pfn_base = PFN_DOWN(pa);
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/* Sanity check alignment and size */
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BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
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BUG_ON((pa % (PAGE_SIZE * PTRS_PER_PTE)) != 0);
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#ifndef __PAGETABLE_PMD_FOLDED
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trampoline_pg_dir[(PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD] =
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pfn_pgd(PFN_DOWN((uintptr_t)trampoline_pmd),
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__pgprot(_PAGE_TABLE));
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trampoline_pmd[0] = pfn_pmd(PFN_DOWN(pa), prot);
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for (i = 0; i < (-PAGE_OFFSET)/PGDIR_SIZE; ++i) {
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size_t o = (PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD + i;
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swapper_pg_dir[o] =
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pfn_pgd(PFN_DOWN((uintptr_t)swapper_pmd) + i,
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__pgprot(_PAGE_TABLE));
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}
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for (i = 0; i < ARRAY_SIZE(swapper_pmd); i++)
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swapper_pmd[i] = pfn_pmd(PFN_DOWN(pa + i * PMD_SIZE), prot);
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swapper_pg_dir[(FIXADDR_START >> PGDIR_SHIFT) % PTRS_PER_PGD] =
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pfn_pgd(PFN_DOWN((uintptr_t)fixmap_pmd),
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__pgprot(_PAGE_TABLE));
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fixmap_pmd[(FIXADDR_START >> PMD_SHIFT) % PTRS_PER_PMD] =
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pfn_pmd(PFN_DOWN((uintptr_t)fixmap_pte),
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__pgprot(_PAGE_TABLE));
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#else
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trampoline_pg_dir[(PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD] =
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pfn_pgd(PFN_DOWN(pa), prot);
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for (i = 0; i < (-PAGE_OFFSET)/PGDIR_SIZE; ++i) {
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size_t o = (PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD + i;
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swapper_pg_dir[o] =
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pfn_pgd(PFN_DOWN(pa + i * PGDIR_SIZE), prot);
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}
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swapper_pg_dir[(FIXADDR_START >> PGDIR_SHIFT) % PTRS_PER_PGD] =
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pfn_pgd(PFN_DOWN((uintptr_t)fixmap_pte),
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__pgprot(_PAGE_TABLE));
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#endif
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}
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