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>
29 #include <asm/processor.h>
30 #include <asm/system.h>
31 #include <asm/uaccess.h>
32 #include <asm/pgtable.h>
33 #include <asm/pgalloc.h>
35 #include <asm/lowcore.h>
37 #include <asm/tlbflush.h>
38 #include <asm/sections.h>
40 DEFINE_PER_CPU(struct mmu_gather
, mmu_gathers
);
42 pgd_t swapper_pg_dir
[PTRS_PER_PGD
] __attribute__((__aligned__(PAGE_SIZE
)));
43 char empty_zero_page
[PAGE_SIZE
] __attribute__((__aligned__(PAGE_SIZE
)));
45 void diag10(unsigned long addr
)
47 if (addr
>= 0x7ff00000)
64 int i
, total
= 0, reserved
= 0;
65 int shared
= 0, cached
= 0;
68 printk("Mem-info:\n");
70 printk("Free swap: %6ldkB\n", nr_swap_pages
<<(PAGE_SHIFT
-10));
75 page
= pfn_to_page(i
);
77 if (PageReserved(page
))
79 else if (PageSwapCache(page
))
81 else if (page_count(page
))
82 shared
+= page_count(page
) - 1;
84 printk("%d pages of RAM\n",total
);
85 printk("%d reserved pages\n",reserved
);
86 printk("%d pages shared\n",shared
);
87 printk("%d pages swap cached\n",cached
);
90 static void __init
setup_ro_region(void)
96 unsigned long address
, end
;
98 address
= ((unsigned long)&_stext
) & PAGE_MASK
;
99 end
= PFN_ALIGN((unsigned long)&_eshared
);
101 for (; address
< end
; address
+= PAGE_SIZE
) {
102 pgd
= pgd_offset_k(address
);
103 pmd
= pmd_offset(pgd
, address
);
104 pte
= pte_offset_kernel(pmd
, address
);
105 new_pte
= mk_pte_phys(address
, __pgprot(_PAGE_RO
));
111 * paging_init() sets up the page tables
113 void __init
paging_init(void)
117 unsigned long pgdir_k
;
118 static const int ssm_mask
= 0x04000000L
;
119 unsigned long max_zone_pfns
[MAX_NR_ZONES
];
121 pg_dir
= swapper_pg_dir
;
124 pgdir_k
= (__pa(swapper_pg_dir
) & PAGE_MASK
) | _KERN_REGION_TABLE
;
125 for (i
= 0; i
< PTRS_PER_PGD
; i
++)
126 pgd_clear_kernel(pg_dir
+ i
);
128 pgdir_k
= (__pa(swapper_pg_dir
) & PAGE_MASK
) | _KERNSEG_TABLE
;
129 for (i
= 0; i
< PTRS_PER_PGD
; i
++)
130 pmd_clear_kernel((pmd_t
*)(pg_dir
+ i
));
135 S390_lowcore
.kernel_asce
= pgdir_k
;
137 /* enable virtual mapping in kernel mode */
138 __ctl_load(pgdir_k
, 1, 1);
139 __ctl_load(pgdir_k
, 7, 7);
140 __ctl_load(pgdir_k
, 13, 13);
141 __raw_local_irq_ssm(ssm_mask
);
143 memset(max_zone_pfns
, 0, sizeof(max_zone_pfns
));
144 max_zone_pfns
[ZONE_DMA
] = PFN_DOWN(MAX_DMA_ADDRESS
);
145 max_zone_pfns
[ZONE_NORMAL
] = max_low_pfn
;
146 free_area_init_nodes(max_zone_pfns
);
149 void __init
mem_init(void)
151 unsigned long codesize
, reservedpages
, datasize
, initsize
;
153 max_mapnr
= num_physpages
= max_low_pfn
;
154 high_memory
= (void *) __va(max_low_pfn
* PAGE_SIZE
);
156 /* clear the zero-page */
157 memset(empty_zero_page
, 0, PAGE_SIZE
);
159 /* this will put all low memory onto the freelists */
160 totalram_pages
+= free_all_bootmem();
164 codesize
= (unsigned long) &_etext
- (unsigned long) &_text
;
165 datasize
= (unsigned long) &_edata
- (unsigned long) &_etext
;
166 initsize
= (unsigned long) &__init_end
- (unsigned long) &__init_begin
;
167 printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
168 (unsigned long) nr_free_pages() << (PAGE_SHIFT
-10),
169 max_mapnr
<< (PAGE_SHIFT
-10),
171 reservedpages
<< (PAGE_SHIFT
-10),
174 printk("Write protected kernel read-only data: %#lx - %#lx\n",
175 (unsigned long)&_stext
,
176 PFN_ALIGN((unsigned long)&_eshared
) - 1);
179 void free_initmem(void)
183 addr
= (unsigned long)(&__init_begin
);
184 for (; addr
< (unsigned long)(&__init_end
); addr
+= PAGE_SIZE
) {
185 ClearPageReserved(virt_to_page(addr
));
186 init_page_count(virt_to_page(addr
));
187 memset((void *)addr
, POISON_FREE_INITMEM
, PAGE_SIZE
);
191 printk ("Freeing unused kernel memory: %ldk freed\n",
192 ((unsigned long)&__init_end
- (unsigned long)&__init_begin
) >> 10);
195 #ifdef CONFIG_BLK_DEV_INITRD
196 void free_initrd_mem(unsigned long start
, unsigned long end
)
199 printk ("Freeing initrd memory: %ldk freed\n", (end
- start
) >> 10);
200 for (; start
< end
; start
+= PAGE_SIZE
) {
201 ClearPageReserved(virt_to_page(start
));
202 init_page_count(virt_to_page(start
));