]>
git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - arch/m68k/mm/sun3mmu.c
2 * linux/arch/m68k/mm/sun3mmu.c
4 * Implementations of mm routines specific to the sun3 MMU.
6 * Moved here 8/20/1999 Sam Creasey
10 #include <linux/signal.h>
11 #include <linux/sched.h>
13 #include <linux/swap.h>
14 #include <linux/kernel.h>
15 #include <linux/string.h>
16 #include <linux/types.h>
17 #include <linux/init.h>
18 #include <linux/bootmem.h>
20 #include <asm/setup.h>
21 #include <asm/uaccess.h>
23 #include <asm/pgtable.h>
24 #include <asm/machdep.h>
27 extern void mmu_emu_init (unsigned long bootmem_end
);
29 const char bad_pmd_string
[] = "Bad pmd in pte_alloc: %08lx\n";
31 extern unsigned long num_pages
;
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 */
36 void __init
paging_init(void)
41 unsigned long address
;
42 unsigned long next_pgtable
;
43 unsigned long bootmem_end
;
44 unsigned long zones_size
[MAX_NR_ZONES
] = { 0, };
47 #ifdef TEST_VERIFY_AREA
50 empty_zero_page
= alloc_bootmem_pages(PAGE_SIZE
);
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
));
57 size
= num_pages
* sizeof(pte_t
);
58 size
= (size
+ PAGE_SIZE
) & ~(PAGE_SIZE
-1);
60 next_pgtable
= (unsigned long)alloc_bootmem_pages(size
);
61 bootmem_end
= (next_pgtable
+ size
+ PAGE_SIZE
) & PAGE_MASK
;
63 /* Map whole memory from PAGE_OFFSET (0x0E000000) */
64 pg_dir
+= PAGE_OFFSET
>> PGDIR_SHIFT
;
66 while (address
< (unsigned long)high_memory
) {
67 pg_table
= (pte_t
*) __pa (next_pgtable
);
68 next_pgtable
+= PTRS_PER_PTE
* sizeof (pte_t
);
69 pgd_val(*pg_dir
) = (unsigned long) pg_table
;
72 /* now change pg_table to kernel virtual addresses */
73 pg_table
= (pte_t
*) __va ((unsigned long) pg_table
);
74 for (i
=0; i
<PTRS_PER_PTE
; ++i
, ++pg_table
) {
75 pte_t pte
= pfn_pte(virt_to_pfn(address
), PAGE_INIT
);
76 if (address
>= (unsigned long)high_memory
)
78 set_pte (pg_table
, pte
);
83 mmu_emu_init(bootmem_end
);
87 /* memory sizing is a hack stolen from motorola.c.. hope it works for us */
88 zones_size
[ZONE_DMA
] = ((unsigned long)high_memory
- PAGE_OFFSET
) >> PAGE_SHIFT
;
90 /* I really wish I knew why the following change made things better... -- Sam */
91 /* free_area_init(zones_size); */
92 free_area_init_node(0, zones_size
,
93 (__pa(PAGE_OFFSET
) >> PAGE_SHIFT
) + 1, NULL
);