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97 lines
2.7 KiB
97 lines
2.7 KiB
// 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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