1 // SPDX-License-Identifier: GPL-2.0 1
2 /*
3 * linux/arch/m68k/mm/sun3mmu.c
4 *
5 * Implementations of mm routines specific to
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>
19 #include <linux/memblock.h>
20
21 #include <asm/setup.h>
22 #include <linux/uaccess.h>
23 #include <asm/page.h>
24 #include <asm/machdep.h>
25 #include <asm/io.h>
26
27 #include "../sun3/sun3.h"
28
29 const char bad_pmd_string[] = "Bad pmd in pte_
30
31 extern unsigned long num_pages;
32
33 /* For the sun3 we try to follow the i386 pagi
34 /* start_mem and end_mem have PAGE_OFFSET adde
35 /* now sets up tables using sun3 PTEs rather t
36 void __init paging_init(void)
37 {
38 pgd_t * pg_dir;
39 pte_t * pg_table;
40 int i;
41 unsigned long address;
42 unsigned long next_pgtable;
43 unsigned long bootmem_end;
44 unsigned long max_zone_pfn[MAX_NR_ZONE
45 unsigned long size;
46
47 empty_zero_page = memblock_alloc(PAGE_
48 if (!empty_zero_page)
49 panic("%s: Failed to allocate
50 __func__, PAGE_SIZE, PAG
51
52 address = PAGE_OFFSET;
53 pg_dir = swapper_pg_dir;
54 memset (swapper_pg_dir, 0, sizeof (swa
55 memset (kernel_pg_dir, 0, sizeof (ker
56
57 size = num_pages * sizeof(pte_t);
58 size = (size + PAGE_SIZE) & ~(PAGE_SIZ
59
60 next_pgtable = (unsigned long)memblock
61 if (!next_pgtable)
62 panic("%s: Failed to allocate
63 __func__, size, PAGE_SIZ
64 bootmem_end = (next_pgtable + size + P
65
66 /* Map whole memory from PAGE_OFFSET (
67 pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
68
69 while (address < (unsigned long)high_m
70 pg_table = (pte_t *) __pa (nex
71 next_pgtable += PTRS_PER_PTE *
72 pgd_val(*pg_dir) = (unsigned l
73 pg_dir++;
74
75 /* now change pg_table to kern
76 pg_table = (pte_t *) __va ((un
77 for (i=0; i<PTRS_PER_PTE; ++i,
78 pte_t pte = pfn_pte(vi
79 if (address >= (unsign
80 pte_val (pte)
81 set_pte (pg_table, pte
82 address += PAGE_SIZE;
83 }
84 }
85
86 mmu_emu_init(bootmem_end);
87
88 current->mm = NULL;
89
90 /* memory sizing is a hack stolen from
91 max_zone_pfn[ZONE_DMA] = ((unsigned lo
92
93 /* I really wish I knew why the follow
94 free_area_init(max_zone_pfn);
95
96
97 }
98
99 static const pgprot_t protection_map[16] = {
100 [VM_NONE]
101 [VM_READ]
102 [VM_WRITE]
103 [VM_WRITE | VM_READ]
104 [VM_EXEC]
105 [VM_EXEC | VM_READ]
106 [VM_EXEC | VM_WRITE]
107 [VM_EXEC | VM_WRITE | VM_READ]
108 [VM_SHARED]
109 [VM_SHARED | VM_READ]
110 [VM_SHARED | VM_WRITE]
111 [VM_SHARED | VM_WRITE | VM_READ]
112 [VM_SHARED | VM_EXEC]
113 [VM_SHARED | VM_EXEC | VM_READ]
114 [VM_SHARED | VM_EXEC | VM_WRITE]
115 [VM_SHARED | VM_EXEC | VM_WRITE | VM_R
116 };
117 DECLARE_VM_GET_PAGE_PROT
118
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