220 lines
5.1 KiB
C
220 lines
5.1 KiB
C
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// 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 <linux/initrd.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/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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#include <asm/cacheflush.h>
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#define PTRS_KERN_TABLE \
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((PTRS_PER_PGD - USER_PTRS_PER_PGD) * PTRS_PER_PTE)
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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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pte_t kernel_pte_tables[PTRS_KERN_TABLE] __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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#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_err("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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if (memblock_is_region_reserved(__pa(initrd_start), size)) {
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pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region",
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__pa(initrd_start), size);
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goto disable;
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}
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memblock_reserve(__pa(initrd_start), size);
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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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initrd_below_start_ok = 1;
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return;
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disable:
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initrd_start = initrd_end = 0;
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pr_err(" - disabling initrd\n");
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}
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#endif
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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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set_max_mapnr(highend_pfn - ARCH_PFN_OFFSET);
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#else
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set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
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#endif
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high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
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#ifdef CONFIG_BLK_DEV_INITRD
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setup_initrd();
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#endif
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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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}
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void free_initmem(void)
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{
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free_initmem_default(-1);
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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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flush_tlb_all();
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local_icache_inv_all(NULL);
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}
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void __init mmu_init(unsigned long min_pfn, unsigned long max_pfn)
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{
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int i;
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for (i = 0; i < USER_PTRS_PER_PGD; i++)
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swapper_pg_dir[i].pgd = __pa(invalid_pte_table);
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for (i = USER_PTRS_PER_PGD; i < PTRS_PER_PGD; i++)
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swapper_pg_dir[i].pgd =
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__pa(kernel_pte_tables + (PTRS_PER_PTE * (i - USER_PTRS_PER_PGD)));
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for (i = 0; i < PTRS_KERN_TABLE; i++)
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set_pte(&kernel_pte_tables[i], __pte(_PAGE_GLOBAL));
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for (i = min_pfn; i < max_pfn; i++)
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set_pte(&kernel_pte_tables[i - PFN_DOWN(va_pa_offset)], pfn_pte(i, PAGE_KERNEL));
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flush_tlb_all();
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local_icache_inv_all(NULL);
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/* Setup page mask to 4k */
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write_mmu_pagemask(0);
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setup_pgd(swapper_pg_dir, 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_index(vaddr);
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j = pud_index(vaddr);
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k = pmd_index(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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static const pgprot_t protection_map[16] = {
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[VM_NONE] = PAGE_NONE,
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[VM_READ] = PAGE_READ,
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[VM_WRITE] = PAGE_READ,
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[VM_WRITE | VM_READ] = PAGE_READ,
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[VM_EXEC] = PAGE_READ,
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[VM_EXEC | VM_READ] = PAGE_READ,
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[VM_EXEC | VM_WRITE] = PAGE_READ,
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[VM_EXEC | VM_WRITE | VM_READ] = PAGE_READ,
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[VM_SHARED] = PAGE_NONE,
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[VM_SHARED | VM_READ] = PAGE_READ,
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[VM_SHARED | VM_WRITE] = PAGE_WRITE,
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[VM_SHARED | VM_WRITE | VM_READ] = PAGE_WRITE,
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[VM_SHARED | VM_EXEC] = PAGE_READ,
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[VM_SHARED | VM_EXEC | VM_READ] = PAGE_READ,
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[VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_WRITE,
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[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_WRITE
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};
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DECLARE_VM_GET_PAGE_PROT
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