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1// SPDX-License-Identifier: GPL-2.0
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>
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
27extern void mmu_emu_init (unsigned long bootmem_end);
28
29const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n";
30
31extern unsigned long num_pages;
32
33/* For the sun3 we try to follow the i386 paging_init() more closely */
34/* start_mem and end_mem have PAGE_OFFSET added already */
35/* now sets up tables using sun3 PTEs rather than i386 as before. --m */
36void __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_ZONES] = { 0, };
45 unsigned long size;
46
47 empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
48 if (!empty_zero_page)
49 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
50 __func__, PAGE_SIZE, PAGE_SIZE);
51
52 address = PAGE_OFFSET;
53 pg_dir = swapper_pg_dir;
54 memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir));
55 memset (kernel_pg_dir, 0, sizeof (kernel_pg_dir));
56
57 size = num_pages * sizeof(pte_t);
58 size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);
59
60 next_pgtable = (unsigned long)memblock_alloc(size, PAGE_SIZE);
61 if (!next_pgtable)
62 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
63 __func__, size, PAGE_SIZE);
64 bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;
65
66 /* Map whole memory from PAGE_OFFSET (0x0E000000) */
67 pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
68
69 while (address < (unsigned long)high_memory) {
70 pg_table = (pte_t *) __pa (next_pgtable);
71 next_pgtable += PTRS_PER_PTE * sizeof (pte_t);
72 pgd_val(*pg_dir) = (unsigned long) pg_table;
73 pg_dir++;
74
75 /* now change pg_table to kernel virtual addresses */
76 pg_table = (pte_t *) __va ((unsigned long) pg_table);
77 for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) {
78 pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT);
79 if (address >= (unsigned long)high_memory)
80 pte_val (pte) = 0;
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 motorola.c.. hope it works for us */
91 max_zone_pfn[ZONE_DMA] = ((unsigned long)high_memory) >> PAGE_SHIFT;
92
93 /* I really wish I knew why the following change made things better... -- Sam */
94 free_area_init(max_zone_pfn);
95
96
97}
1// SPDX-License-Identifier: GPL-2.0
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>
19#include <linux/bootmem.h>
20
21#include <asm/setup.h>
22#include <linux/uaccess.h>
23#include <asm/page.h>
24#include <asm/pgtable.h>
25#include <asm/machdep.h>
26#include <asm/io.h>
27
28extern void mmu_emu_init (unsigned long bootmem_end);
29
30const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n";
31
32extern unsigned long num_pages;
33
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 */
37void __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;
45 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
46 unsigned long size;
47
48 empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
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
58 next_pgtable = (unsigned long)alloc_bootmem_pages(size);
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 */
86 zones_size[ZONE_DMA] = ((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT;
87
88 /* I really wish I knew why the following change made things better... -- Sam */
89/* free_area_init(zones_size); */
90 free_area_init_node(0, zones_size,
91 (__pa(PAGE_OFFSET) >> PAGE_SHIFT) + 1, NULL);
92
93
94}
95
96