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7f4a567332
There is no present bit in csky pmd hardware, so we need to prepare invalid_pte_table for empty pmd entry and the functions (pmd_none & pmd_present) in pgtable.h need invalid_pte_talbe to get result. If a module use these functions, we need export the symbol for it. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Cc: Mo Qihui <qihui.mo@verisilicon.com> Cc: Zhange Jian <zhang_jian5@dahuatech.com>
152 lines
3.4 KiB
C
152 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
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#include <linux/bug.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/signal.h>
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#include <linux/sched.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/highmem.h>
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#include <linux/memblock.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 <asm/setup.h>
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#include <asm/cachectl.h>
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#include <asm/dma.h>
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#include <asm/pgtable.h>
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#include <asm/pgalloc.h>
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#include <asm/mmu_context.h>
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#include <asm/sections.h>
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#include <asm/tlb.h>
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pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
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pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
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EXPORT_SYMBOL(invalid_pte_table);
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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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void __init mem_init(void)
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{
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#ifdef CONFIG_HIGHMEM
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unsigned long tmp;
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max_mapnr = highend_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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memblock_free_all();
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#ifdef CONFIG_HIGHMEM
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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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/* FIXME not sure about */
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if (!memblock_is_reserved(tmp << PAGE_SHIFT))
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free_highmem_page(page);
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}
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#endif
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mem_init_print_info(NULL);
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}
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extern char __init_begin[], __init_end[];
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void free_initmem(void)
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{
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unsigned long addr;
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addr = (unsigned long) &__init_begin;
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while (addr < (unsigned long) &__init_end) {
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ClearPageReserved(virt_to_page(addr));
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init_page_count(virt_to_page(addr));
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free_page(addr);
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totalram_pages_inc();
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addr += PAGE_SIZE;
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}
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pr_info("Freeing unused kernel memory: %dk freed\n",
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((unsigned int)&__init_end - (unsigned int)&__init_begin) >> 10);
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}
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void pgd_init(unsigned long *p)
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{
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int i;
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for (i = 0; i < PTRS_PER_PGD; i++)
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p[i] = __pa(invalid_pte_table);
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}
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void __init pre_mmu_init(void)
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{
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/*
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* Setup page-table and enable TLB-hardrefill
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*/
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flush_tlb_all();
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pgd_init((unsigned long *)swapper_pg_dir);
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TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir);
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TLBMISS_HANDLER_SETUP_PGD_KERNEL(swapper_pg_dir);
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/* Setup page mask to 4k */
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write_mmu_pagemask(0);
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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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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 *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
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if (!pte)
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panic("%s: Failed to allocate %lu bytes align=%lx\n",
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__func__, PAGE_SIZE,
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PAGE_SIZE);
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set_pmd(pmd, __pmd(__pa(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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}
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void __init fixaddr_init(void)
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{
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unsigned long vaddr;
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vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
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fixrange_init(vaddr, vaddr + PMD_SIZE, swapper_pg_dir);
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}
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