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>
27 #include <linux/poison.h>
28 #include <linux/initrd.h>
30 #include <asm/processor.h>
31 #include <asm/system.h>
32 #include <asm/uaccess.h>
33 #include <asm/pgtable.h>
34 #include <asm/pgalloc.h>
36 #include <asm/lowcore.h>
38 #include <asm/tlbflush.h>
39 #include <asm/sections.h>
41 DEFINE_PER_CPU(struct mmu_gather
, mmu_gathers
);
43 pgd_t swapper_pg_dir
[PTRS_PER_PGD
] __attribute__((__aligned__(PAGE_SIZE
)));
44 char empty_zero_page
[PAGE_SIZE
] __attribute__((__aligned__(PAGE_SIZE
)));
46 void diag10(unsigned long addr
)
48 if (addr
>= 0x7ff00000)
65 int i
, total
= 0, reserved
= 0;
66 int shared
= 0, cached
= 0;
69 printk("Mem-info:\n");
71 printk("Free swap: %6ldkB\n", nr_swap_pages
<<(PAGE_SHIFT
-10));
76 page
= pfn_to_page(i
);
78 if (PageReserved(page
))
80 else if (PageSwapCache(page
))
82 else if (page_count(page
))
83 shared
+= page_count(page
) - 1;
85 printk("%d pages of RAM\n",total
);
86 printk("%d reserved pages\n",reserved
);
87 printk("%d pages shared\n",shared
);
88 printk("%d pages swap cached\n",cached
);
91 static void __init
setup_ro_region(void)
97 unsigned long address
, end
;
99 address
= ((unsigned long)&__start_rodata
) & PAGE_MASK
;
100 end
= PFN_ALIGN((unsigned long)&__end_rodata
);
102 for (; address
< end
; address
+= PAGE_SIZE
) {
103 pgd
= pgd_offset_k(address
);
104 pmd
= pmd_offset(pgd
, address
);
105 pte
= pte_offset_kernel(pmd
, address
);
106 new_pte
= mk_pte_phys(address
, __pgprot(_PAGE_RO
));
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 max_zone_pfns
[MAX_NR_ZONES
];
122 pg_dir
= swapper_pg_dir
;
125 pgdir_k
= (__pa(swapper_pg_dir
) & PAGE_MASK
) | _KERN_REGION_TABLE
;
126 for (i
= 0; i
< PTRS_PER_PGD
; i
++)
127 pgd_clear_kernel(pg_dir
+ i
);
129 pgdir_k
= (__pa(swapper_pg_dir
) & PAGE_MASK
) | _KERNSEG_TABLE
;
130 for (i
= 0; i
< PTRS_PER_PGD
; i
++)
131 pmd_clear_kernel((pmd_t
*)(pg_dir
+ i
));
136 S390_lowcore
.kernel_asce
= pgdir_k
;
138 /* enable virtual mapping in kernel mode */
139 __ctl_load(pgdir_k
, 1, 1);
140 __ctl_load(pgdir_k
, 7, 7);
141 __ctl_load(pgdir_k
, 13, 13);
142 __raw_local_irq_ssm(ssm_mask
);
144 memset(max_zone_pfns
, 0, sizeof(max_zone_pfns
));
145 max_zone_pfns
[ZONE_DMA
] = PFN_DOWN(MAX_DMA_ADDRESS
);
146 max_zone_pfns
[ZONE_NORMAL
] = max_low_pfn
;
147 free_area_init_nodes(max_zone_pfns
);
150 void __init
mem_init(void)
152 unsigned long codesize
, reservedpages
, datasize
, initsize
;
154 max_mapnr
= num_physpages
= max_low_pfn
;
155 high_memory
= (void *) __va(max_low_pfn
* PAGE_SIZE
);
157 /* clear the zero-page */
158 memset(empty_zero_page
, 0, PAGE_SIZE
);
160 /* this will put all low memory onto the freelists */
161 totalram_pages
+= free_all_bootmem();
165 codesize
= (unsigned long) &_etext
- (unsigned long) &_text
;
166 datasize
= (unsigned long) &_edata
- (unsigned long) &_etext
;
167 initsize
= (unsigned long) &__init_end
- (unsigned long) &__init_begin
;
168 printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
169 (unsigned long) nr_free_pages() << (PAGE_SHIFT
-10),
170 max_mapnr
<< (PAGE_SHIFT
-10),
172 reservedpages
<< (PAGE_SHIFT
-10),
175 printk("Write protected kernel read-only data: %#lx - %#lx\n",
176 (unsigned long)&__start_rodata
,
177 PFN_ALIGN((unsigned long)&__end_rodata
) - 1);
180 void free_initmem(void)
184 addr
= (unsigned long)(&__init_begin
);
185 for (; addr
< (unsigned long)(&__init_end
); addr
+= PAGE_SIZE
) {
186 ClearPageReserved(virt_to_page(addr
));
187 init_page_count(virt_to_page(addr
));
188 memset((void *)addr
, POISON_FREE_INITMEM
, PAGE_SIZE
);
192 printk ("Freeing unused kernel memory: %ldk freed\n",
193 ((unsigned long)&__init_end
- (unsigned long)&__init_begin
) >> 10);
196 #ifdef CONFIG_BLK_DEV_INITRD
197 void free_initrd_mem(unsigned long start
, unsigned long end
)
200 printk ("Freeing initrd memory: %ldk freed\n", (end
- start
) >> 10);
201 for (; start
< end
; start
+= PAGE_SIZE
) {
202 ClearPageReserved(virt_to_page(start
));
203 init_page_count(virt_to_page(start
));
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