5 * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Hartmut Penner (hp@de.ibm.com)
8 * Derived from "arch/i386/mm/init.c"
9 * Copyright (C) 1995 Linus Torvalds
12 #include <linux/signal.h>
13 #include <linux/sched.h>
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/string.h>
17 #include <linux/types.h>
18 #include <linux/ptrace.h>
19 #include <linux/mman.h>
21 #include <linux/swap.h>
22 #include <linux/smp.h>
23 #include <linux/init.h>
24 #include <linux/pagemap.h>
25 #include <linux/bootmem.h>
26 #include <linux/pfn.h>
28 #include <asm/processor.h>
29 #include <asm/system.h>
30 #include <asm/uaccess.h>
31 #include <asm/pgtable.h>
32 #include <asm/pgalloc.h>
34 #include <asm/lowcore.h>
36 #include <asm/tlbflush.h>
37 #include <asm/sections.h>
39 DEFINE_PER_CPU(struct mmu_gather
, mmu_gathers
);
41 pgd_t swapper_pg_dir
[PTRS_PER_PGD
] __attribute__((__aligned__(PAGE_SIZE
)));
42 char empty_zero_page
[PAGE_SIZE
] __attribute__((__aligned__(PAGE_SIZE
)));
44 void diag10(unsigned long addr
)
46 if (addr
>= 0x7ff00000)
63 int i
, total
= 0, reserved
= 0;
64 int shared
= 0, cached
= 0;
66 printk("Mem-info:\n");
68 printk("Free swap: %6ldkB\n", nr_swap_pages
<<(PAGE_SHIFT
-10));
72 if (PageReserved(mem_map
+i
))
74 else if (PageSwapCache(mem_map
+i
))
76 else if (page_count(mem_map
+i
))
77 shared
+= page_count(mem_map
+i
) - 1;
79 printk("%d pages of RAM\n",total
);
80 printk("%d reserved pages\n",reserved
);
81 printk("%d pages shared\n",shared
);
82 printk("%d pages swap cached\n",cached
);
85 extern unsigned long __initdata zholes_size
[];
87 * paging_init() sets up the page tables
91 void __init
paging_init(void)
98 unsigned long pfn
= 0;
99 unsigned long pgdir_k
= (__pa(swapper_pg_dir
) & PAGE_MASK
) | _KERNSEG_TABLE
;
100 static const int ssm_mask
= 0x04000000L
;
101 unsigned long ro_start_pfn
, ro_end_pfn
;
102 unsigned long zones_size
[MAX_NR_ZONES
];
104 ro_start_pfn
= PFN_DOWN((unsigned long)&__start_rodata
);
105 ro_end_pfn
= PFN_UP((unsigned long)&__end_rodata
);
107 memset(zones_size
, 0, sizeof(zones_size
));
108 zones_size
[ZONE_DMA
] = max_low_pfn
;
109 free_area_init_node(0, &contig_page_data
, zones_size
,
110 __pa(PAGE_OFFSET
) >> PAGE_SHIFT
,
113 /* unmap whole virtual address space */
115 pg_dir
= swapper_pg_dir
;
117 for (i
= 0; i
< PTRS_PER_PGD
; i
++)
118 pmd_clear((pmd_t
*) pg_dir
++);
121 * map whole physical memory to virtual memory (identity mapping)
124 pg_dir
= swapper_pg_dir
;
126 while (pfn
< max_low_pfn
) {
128 * pg_table is physical at this point
130 pg_table
= (pte_t
*) alloc_bootmem_pages(PAGE_SIZE
);
132 pmd_populate_kernel(&init_mm
, (pmd_t
*) pg_dir
, pg_table
);
135 for (tmp
= 0 ; tmp
< PTRS_PER_PTE
; tmp
++,pg_table
++) {
136 if (pfn
>= ro_start_pfn
&& pfn
< ro_end_pfn
)
137 pte
= pfn_pte(pfn
, __pgprot(_PAGE_RO
));
139 pte
= pfn_pte(pfn
, PAGE_KERNEL
);
140 if (pfn
>= max_low_pfn
)
141 pte_val(pte
) = _PAGE_TYPE_EMPTY
;
142 set_pte(pg_table
, pte
);
147 S390_lowcore
.kernel_asce
= pgdir_k
;
149 /* enable virtual mapping in kernel mode */
150 __ctl_load(pgdir_k
, 1, 1);
151 __ctl_load(pgdir_k
, 7, 7);
152 __ctl_load(pgdir_k
, 13, 13);
153 __raw_local_irq_ssm(ssm_mask
);
159 #else /* CONFIG_64BIT */
161 void __init
paging_init(void)
168 unsigned long pfn
= 0;
169 unsigned long pgdir_k
= (__pa(swapper_pg_dir
) & PAGE_MASK
) |
171 static const int ssm_mask
= 0x04000000L
;
172 unsigned long zones_size
[MAX_NR_ZONES
];
173 unsigned long dma_pfn
, high_pfn
;
174 unsigned long ro_start_pfn
, ro_end_pfn
;
176 memset(zones_size
, 0, sizeof(zones_size
));
177 dma_pfn
= MAX_DMA_ADDRESS
>> PAGE_SHIFT
;
178 high_pfn
= max_low_pfn
;
179 ro_start_pfn
= PFN_DOWN((unsigned long)&__start_rodata
);
180 ro_end_pfn
= PFN_UP((unsigned long)&__end_rodata
);
182 if (dma_pfn
> high_pfn
)
183 zones_size
[ZONE_DMA
] = high_pfn
;
185 zones_size
[ZONE_DMA
] = dma_pfn
;
186 zones_size
[ZONE_NORMAL
] = high_pfn
- dma_pfn
;
189 /* Initialize mem_map[]. */
190 free_area_init_node(0, &contig_page_data
, zones_size
,
191 __pa(PAGE_OFFSET
) >> PAGE_SHIFT
, zholes_size
);
194 * map whole physical memory to virtual memory (identity mapping)
197 pg_dir
= swapper_pg_dir
;
199 for (i
= 0 ; i
< PTRS_PER_PGD
; i
++,pg_dir
++) {
201 if (pfn
>= max_low_pfn
) {
206 pm_dir
= (pmd_t
*) alloc_bootmem_pages(PAGE_SIZE
* 4);
207 pgd_populate(&init_mm
, pg_dir
, pm_dir
);
209 for (j
= 0 ; j
< PTRS_PER_PMD
; j
++,pm_dir
++) {
210 if (pfn
>= max_low_pfn
) {
215 pt_dir
= (pte_t
*) alloc_bootmem_pages(PAGE_SIZE
);
216 pmd_populate_kernel(&init_mm
, pm_dir
, pt_dir
);
218 for (k
= 0 ; k
< PTRS_PER_PTE
; k
++,pt_dir
++) {
219 if (pfn
>= ro_start_pfn
&& pfn
< ro_end_pfn
)
220 pte
= pfn_pte(pfn
, __pgprot(_PAGE_RO
));
222 pte
= pfn_pte(pfn
, PAGE_KERNEL
);
223 if (pfn
>= max_low_pfn
)
224 pte_val(pte
) = _PAGE_TYPE_EMPTY
;
225 set_pte(pt_dir
, pte
);
231 S390_lowcore
.kernel_asce
= pgdir_k
;
233 /* enable virtual mapping in kernel mode */
234 __ctl_load(pgdir_k
, 1, 1);
235 __ctl_load(pgdir_k
, 7, 7);
236 __ctl_load(pgdir_k
, 13, 13);
237 __raw_local_irq_ssm(ssm_mask
);
243 #endif /* CONFIG_64BIT */
245 void __init
mem_init(void)
247 unsigned long codesize
, reservedpages
, datasize
, initsize
;
249 max_mapnr
= num_physpages
= max_low_pfn
;
250 high_memory
= (void *) __va(max_low_pfn
* PAGE_SIZE
);
252 /* clear the zero-page */
253 memset(empty_zero_page
, 0, PAGE_SIZE
);
255 /* this will put all low memory onto the freelists */
256 totalram_pages
+= free_all_bootmem();
260 codesize
= (unsigned long) &_etext
- (unsigned long) &_text
;
261 datasize
= (unsigned long) &_edata
- (unsigned long) &_etext
;
262 initsize
= (unsigned long) &__init_end
- (unsigned long) &__init_begin
;
263 printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
264 (unsigned long) nr_free_pages() << (PAGE_SHIFT
-10),
265 max_mapnr
<< (PAGE_SHIFT
-10),
267 reservedpages
<< (PAGE_SHIFT
-10),
270 printk("Write protected kernel read-only data: %#lx - %#lx\n",
271 (unsigned long)&__start_rodata
,
272 PFN_ALIGN((unsigned long)&__end_rodata
) - 1);
275 void free_initmem(void)
279 addr
= (unsigned long)(&__init_begin
);
280 for (; addr
< (unsigned long)(&__init_end
); addr
+= PAGE_SIZE
) {
281 ClearPageReserved(virt_to_page(addr
));
282 init_page_count(virt_to_page(addr
));
286 printk ("Freeing unused kernel memory: %ldk freed\n",
287 ((unsigned long)&__init_end
- (unsigned long)&__init_begin
) >> 10);
290 #ifdef CONFIG_BLK_DEV_INITRD
291 void free_initrd_mem(unsigned long start
, unsigned long end
)
294 printk ("Freeing initrd memory: %ldk freed\n", (end
- start
) >> 10);
295 for (; start
< end
; start
+= PAGE_SIZE
) {
296 ClearPageReserved(virt_to_page(start
));
297 init_page_count(virt_to_page(start
));