projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 1da177e4 LT |
2 | /* |
| 3 | * linux/arch/m68k/mm/sun3mmu.c | |
| 4 | * | |
| 5 | * Implementations of mm routines specific to the sun3 MMU. | |
| 6 | * | |
| 7 | * Moved here 8/20/1999 Sam Creasey | |
| 8 | * | |
| 9 | */ | |
| 10 | ||
| 11 | #include <linux/signal.h> | |
| 12 | #include <linux/sched.h> | |
| 13 | #include <linux/mm.h> | |
| 14 | #include <linux/swap.h> | |
| 15 | #include <linux/kernel.h> | |
| 16 | #include <linux/string.h> | |
| 17 | #include <linux/types.h> | |
| 18 | #include <linux/init.h> | |
| 57c8a661 | 19 | #include <linux/memblock.h> |
| 1da177e4 LT |
20 | |
| 21 | #include <asm/setup.h> | |
| 7c0f6ba6 | 22 | #include <linux/uaccess.h> |
| 1da177e4 LT |
23 | #include <asm/page.h> |
| 24 | #include <asm/pgtable.h> | |
| 1da177e4 LT |
25 | #include <asm/machdep.h> |
| 26 | #include <asm/io.h> | |
| 27 | ||
| 28 | extern void mmu_emu_init (unsigned long bootmem_end); | |
| 29 | ||
| 30 | const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n"; | |
| 31 | ||
| 32 | extern unsigned long num_pages; | |
| 33 | ||
| 1da177e4 LT |
34 | /* For the sun3 we try to follow the i386 paging_init() more closely */ |
| 35 | /* start_mem and end_mem have PAGE_OFFSET added already */ | |
| 36 | /* now sets up tables using sun3 PTEs rather than i386 as before. --m */ | |
| 37 | void __init paging_init(void) | |
| 38 | { | |
| 39 | pgd_t * pg_dir; | |
| 40 | pte_t * pg_table; | |
| 41 | int i; | |
| 42 | unsigned long address; | |
| 43 | unsigned long next_pgtable; | |
| 44 | unsigned long bootmem_end; | |
| 2dcf15b7 | 45 | unsigned long zones_size[MAX_NR_ZONES] = { 0, }; |
| 1da177e4 LT |
46 | unsigned long size; |
| 47 | ||
| 15c3c114 | 48 | empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
| 1da177e4 LT |
49 | |
| 50 | address = PAGE_OFFSET; | |
| 51 | pg_dir = swapper_pg_dir; | |
| 52 | memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir)); | |
| 53 | memset (kernel_pg_dir, 0, sizeof (kernel_pg_dir)); | |
| 54 | ||
| 55 | size = num_pages * sizeof(pte_t); | |
| 56 | size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1); | |
| 57 | ||
| 15c3c114 | 58 | next_pgtable = (unsigned long)memblock_alloc(size, PAGE_SIZE); |
| 1da177e4 LT |
59 | bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK; |
| 60 | ||
| 61 | /* Map whole memory from PAGE_OFFSET (0x0E000000) */ | |
| 62 | pg_dir += PAGE_OFFSET >> PGDIR_SHIFT; | |
| 63 | ||
| 64 | while (address < (unsigned long)high_memory) { | |
| 65 | pg_table = (pte_t *) __pa (next_pgtable); | |
| 66 | next_pgtable += PTRS_PER_PTE * sizeof (pte_t); | |
| 67 | pgd_val(*pg_dir) = (unsigned long) pg_table; | |
| 68 | pg_dir++; | |
| 69 | ||
| 70 | /* now change pg_table to kernel virtual addresses */ | |
| 71 | pg_table = (pte_t *) __va ((unsigned long) pg_table); | |
| 72 | for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) { | |
| 73 | pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT); | |
| 74 | if (address >= (unsigned long)high_memory) | |
| 75 | pte_val (pte) = 0; | |
| 76 | set_pte (pg_table, pte); | |
| 77 | address += PAGE_SIZE; | |
| 78 | } | |
| 79 | } | |
| 80 | ||
| 81 | mmu_emu_init(bootmem_end); | |
| 82 | ||
| 83 | current->mm = NULL; | |
| 84 | ||
| 85 | /* memory sizing is a hack stolen from motorola.c.. hope it works for us */ | |
| 2dcf15b7 | 86 | zones_size[ZONE_DMA] = ((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT; |
| 1da177e4 | 87 | |
| a3a79bd7 SC |
88 | /* I really wish I knew why the following change made things better... -- Sam */ |
| 89 | /* free_area_init(zones_size); */ | |
| 9109fb7b | 90 | free_area_init_node(0, zones_size, |
| a3a79bd7 SC |
91 | (__pa(PAGE_OFFSET) >> PAGE_SHIFT) + 1, NULL); |
| 92 | ||
| 1da177e4 LT |
93 | |
| 94 | } | |
| 95 | ||
| 96 |