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;
67 printk("Mem-info:\n");
69 printk("Free swap: %6ldkB\n", nr_swap_pages
<<(PAGE_SHIFT
-10));
74 page
= pfn_to_page(i
);
76 if (PageReserved(page
))
78 else if (PageSwapCache(page
))
80 else if (page_count(page
))
81 shared
+= page_count(page
) - 1;
83 printk("%d pages of RAM\n",total
);
84 printk("%d reserved pages\n",reserved
);
85 printk("%d pages shared\n",shared
);
86 printk("%d pages swap cached\n",cached
);
89 static void __init
setup_ro_region(void)
95 unsigned long address
, end
;
97 address
= ((unsigned long)&__start_rodata
) & PAGE_MASK
;
98 end
= PFN_ALIGN((unsigned long)&__end_rodata
);
100 for (; address
< end
; address
+= PAGE_SIZE
) {
101 pgd
= pgd_offset_k(address
);
102 pmd
= pmd_offset(pgd
, address
);
103 pte
= pte_offset_kernel(pmd
, address
);
104 new_pte
= mk_pte_phys(address
, __pgprot(_PAGE_RO
));
105 set_pte(pte
, new_pte
);
109 extern unsigned long __initdata zholes_size
[];
110 extern void vmem_map_init(void);
112 * paging_init() sets up the page tables
114 void __init
paging_init(void)
118 unsigned long pgdir_k
;
119 static const int ssm_mask
= 0x04000000L
;
120 unsigned long zones_size
[MAX_NR_ZONES
];
121 unsigned long dma_pfn
, high_pfn
;
123 pg_dir
= swapper_pg_dir
;
126 pgdir_k
= (__pa(swapper_pg_dir
) & PAGE_MASK
) | _KERN_REGION_TABLE
;
127 for (i
= 0; i
< PTRS_PER_PGD
; i
++)
128 pgd_clear(pg_dir
+ i
);
130 pgdir_k
= (__pa(swapper_pg_dir
) & PAGE_MASK
) | _KERNSEG_TABLE
;
131 for (i
= 0; i
< PTRS_PER_PGD
; i
++)
132 pmd_clear((pmd_t
*)(pg_dir
+ i
));
137 S390_lowcore
.kernel_asce
= pgdir_k
;
139 /* enable virtual mapping in kernel mode */
140 __ctl_load(pgdir_k
, 1, 1);
141 __ctl_load(pgdir_k
, 7, 7);
142 __ctl_load(pgdir_k
, 13, 13);
143 __raw_local_irq_ssm(ssm_mask
);
145 memset(zones_size
, 0, sizeof(zones_size
));
146 dma_pfn
= MAX_DMA_ADDRESS
>> PAGE_SHIFT
;
147 high_pfn
= max_low_pfn
;
149 if (dma_pfn
> high_pfn
)
150 zones_size
[ZONE_DMA
] = high_pfn
;
152 zones_size
[ZONE_DMA
] = dma_pfn
;
153 zones_size
[ZONE_NORMAL
] = high_pfn
- dma_pfn
;
156 /* Initialize mem_map[]. */
157 free_area_init_node(0, &contig_page_data
, zones_size
,
158 __pa(PAGE_OFFSET
) >> PAGE_SHIFT
, zholes_size
);
161 void __init
mem_init(void)
163 unsigned long codesize
, reservedpages
, datasize
, initsize
;
165 max_mapnr
= num_physpages
= max_low_pfn
;
166 high_memory
= (void *) __va(max_low_pfn
* PAGE_SIZE
);
168 /* clear the zero-page */
169 memset(empty_zero_page
, 0, PAGE_SIZE
);
171 /* this will put all low memory onto the freelists */
172 totalram_pages
+= free_all_bootmem();
176 codesize
= (unsigned long) &_etext
- (unsigned long) &_text
;
177 datasize
= (unsigned long) &_edata
- (unsigned long) &_etext
;
178 initsize
= (unsigned long) &__init_end
- (unsigned long) &__init_begin
;
179 printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
180 (unsigned long) nr_free_pages() << (PAGE_SHIFT
-10),
181 max_mapnr
<< (PAGE_SHIFT
-10),
183 reservedpages
<< (PAGE_SHIFT
-10),
186 printk("Write protected kernel read-only data: %#lx - %#lx\n",
187 (unsigned long)&__start_rodata
,
188 PFN_ALIGN((unsigned long)&__end_rodata
) - 1);
189 printk("Virtual memmap size: %ldk\n",
190 (max_pfn
* sizeof(struct page
)) >> 10);
193 void free_initmem(void)
197 addr
= (unsigned long)(&__init_begin
);
198 for (; addr
< (unsigned long)(&__init_end
); addr
+= PAGE_SIZE
) {
199 ClearPageReserved(virt_to_page(addr
));
200 init_page_count(virt_to_page(addr
));
204 printk ("Freeing unused kernel memory: %ldk freed\n",
205 ((unsigned long)&__init_end
- (unsigned long)&__init_begin
) >> 10);
208 #ifdef CONFIG_BLK_DEV_INITRD
209 void free_initrd_mem(unsigned long start
, unsigned long end
)
212 printk ("Freeing initrd memory: %ldk freed\n", (end
- start
) >> 10);
213 for (; start
< end
; start
+= PAGE_SIZE
) {
214 ClearPageReserved(virt_to_page(start
));
215 init_page_count(virt_to_page(start
));