118 lines
3.4 KiB
C
118 lines
3.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/arch/m68k/mm/sun3mmu.c
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*
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* Implementations of mm routines specific to the sun3 MMU.
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*
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* Moved here 8/20/1999 Sam Creasey
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*
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*/
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/memblock.h>
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#include <asm/setup.h>
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#include <linux/uaccess.h>
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#include <asm/page.h>
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#include <asm/machdep.h>
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#include <asm/io.h>
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extern void mmu_emu_init (unsigned long bootmem_end);
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const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n";
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extern unsigned long num_pages;
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/* For the sun3 we try to follow the i386 paging_init() more closely */
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/* start_mem and end_mem have PAGE_OFFSET added already */
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/* now sets up tables using sun3 PTEs rather than i386 as before. --m */
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void __init paging_init(void)
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{
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pgd_t * pg_dir;
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pte_t * pg_table;
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int i;
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unsigned long address;
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unsigned long next_pgtable;
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unsigned long bootmem_end;
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unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, };
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unsigned long size;
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empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
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if (!empty_zero_page)
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panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
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__func__, PAGE_SIZE, PAGE_SIZE);
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address = PAGE_OFFSET;
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pg_dir = swapper_pg_dir;
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memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir));
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memset (kernel_pg_dir, 0, sizeof (kernel_pg_dir));
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size = num_pages * sizeof(pte_t);
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size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);
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next_pgtable = (unsigned long)memblock_alloc(size, PAGE_SIZE);
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if (!next_pgtable)
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panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
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__func__, size, PAGE_SIZE);
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bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;
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/* Map whole memory from PAGE_OFFSET (0x0E000000) */
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pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
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while (address < (unsigned long)high_memory) {
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pg_table = (pte_t *) __pa (next_pgtable);
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next_pgtable += PTRS_PER_PTE * sizeof (pte_t);
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pgd_val(*pg_dir) = (unsigned long) pg_table;
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pg_dir++;
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/* now change pg_table to kernel virtual addresses */
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pg_table = (pte_t *) __va ((unsigned long) pg_table);
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for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) {
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pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT);
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if (address >= (unsigned long)high_memory)
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pte_val (pte) = 0;
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set_pte (pg_table, pte);
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address += PAGE_SIZE;
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}
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}
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mmu_emu_init(bootmem_end);
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current->mm = NULL;
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/* memory sizing is a hack stolen from motorola.c.. hope it works for us */
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max_zone_pfn[ZONE_DMA] = ((unsigned long)high_memory) >> PAGE_SHIFT;
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/* I really wish I knew why the following change made things better... -- Sam */
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free_area_init(max_zone_pfn);
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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_READONLY,
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[VM_WRITE] = PAGE_COPY,
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[VM_WRITE | VM_READ] = PAGE_COPY,
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[VM_EXEC] = PAGE_READONLY,
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[VM_EXEC | VM_READ] = PAGE_READONLY,
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[VM_EXEC | VM_WRITE] = PAGE_COPY,
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[VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY,
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[VM_SHARED] = PAGE_NONE,
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[VM_SHARED | VM_READ] = PAGE_READONLY,
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[VM_SHARED | VM_WRITE] = PAGE_SHARED,
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[VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
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[VM_SHARED | VM_EXEC] = PAGE_READONLY,
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[VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY,
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[VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED,
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[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED
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};
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DECLARE_VM_GET_PAGE_PROT
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