OpenCores
URL https://opencores.org/ocsvn/or1k_soc_on_altera_embedded_dev_kit/or1k_soc_on_altera_embedded_dev_kit/trunk

Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [s390/] [mm/] [init.c] - Blame information for rev 3

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 3 xianfeng
/*
2
 *  arch/s390/mm/init.c
3
 *
4
 *  S390 version
5
 *    Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
6
 *    Author(s): Hartmut Penner (hp@de.ibm.com)
7
 *
8
 *  Derived from "arch/i386/mm/init.c"
9
 *    Copyright (C) 1995  Linus Torvalds
10
 */
11
 
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>
20
#include <linux/mm.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>
34
#include <asm/dma.h>
35
#include <asm/lowcore.h>
36
#include <asm/tlb.h>
37
#include <asm/tlbflush.h>
38
#include <asm/sections.h>
39
 
40
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
41
 
42
pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
43
char  empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
44
 
45
void show_mem(void)
46
{
47
        int i, total = 0, reserved = 0;
48
        int shared = 0, cached = 0;
49
        struct page *page;
50
 
51
        printk("Mem-info:\n");
52
        show_free_areas();
53
        printk("Free swap:       %6ldkB\n", nr_swap_pages << (PAGE_SHIFT - 10));
54
        i = max_mapnr;
55
        while (i-- > 0) {
56
                if (!pfn_valid(i))
57
                        continue;
58
                page = pfn_to_page(i);
59
                total++;
60
                if (PageReserved(page))
61
                        reserved++;
62
                else if (PageSwapCache(page))
63
                        cached++;
64
                else if (page_count(page))
65
                        shared += page_count(page) - 1;
66
        }
67
        printk("%d pages of RAM\n", total);
68
        printk("%d reserved pages\n", reserved);
69
        printk("%d pages shared\n", shared);
70
        printk("%d pages swap cached\n", cached);
71
 
72
        printk("%lu pages dirty\n", global_page_state(NR_FILE_DIRTY));
73
        printk("%lu pages writeback\n", global_page_state(NR_WRITEBACK));
74
        printk("%lu pages mapped\n", global_page_state(NR_FILE_MAPPED));
75
        printk("%lu pages slab\n",
76
               global_page_state(NR_SLAB_RECLAIMABLE) +
77
               global_page_state(NR_SLAB_UNRECLAIMABLE));
78
        printk("%lu pages pagetables\n", global_page_state(NR_PAGETABLE));
79
}
80
 
81
static void __init setup_ro_region(void)
82
{
83
        pgd_t *pgd;
84
        pud_t *pud;
85
        pmd_t *pmd;
86
        pte_t *pte;
87
        pte_t new_pte;
88
        unsigned long address, end;
89
 
90
        address = ((unsigned long)&_stext) & PAGE_MASK;
91
        end = PFN_ALIGN((unsigned long)&_eshared);
92
 
93
        for (; address < end; address += PAGE_SIZE) {
94
                pgd = pgd_offset_k(address);
95
                pud = pud_offset(pgd, address);
96
                pmd = pmd_offset(pud, address);
97
                pte = pte_offset_kernel(pmd, address);
98
                new_pte = mk_pte_phys(address, __pgprot(_PAGE_RO));
99
                *pte = new_pte;
100
        }
101
}
102
 
103
/*
104
 * paging_init() sets up the page tables
105
 */
106
void __init paging_init(void)
107
{
108
        static const int ssm_mask = 0x04000000L;
109
        unsigned long max_zone_pfns[MAX_NR_ZONES];
110
        unsigned long pgd_type;
111
 
112
        init_mm.pgd = swapper_pg_dir;
113
        S390_lowcore.kernel_asce = __pa(init_mm.pgd) & PAGE_MASK;
114
#ifdef CONFIG_64BIT
115
        S390_lowcore.kernel_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
116
        pgd_type = _REGION3_ENTRY_EMPTY;
117
#else
118
        S390_lowcore.kernel_asce |= _ASCE_TABLE_LENGTH;
119
        pgd_type = _SEGMENT_ENTRY_EMPTY;
120
#endif
121
        clear_table((unsigned long *) init_mm.pgd, pgd_type,
122
                    sizeof(unsigned long)*2048);
123
        vmem_map_init();
124
        setup_ro_region();
125
 
126
        /* enable virtual mapping in kernel mode */
127
        __ctl_load(S390_lowcore.kernel_asce, 1, 1);
128
        __ctl_load(S390_lowcore.kernel_asce, 7, 7);
129
        __ctl_load(S390_lowcore.kernel_asce, 13, 13);
130
        __raw_local_irq_ssm(ssm_mask);
131
 
132
        memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
133
#ifdef CONFIG_ZONE_DMA
134
        max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
135
#endif
136
        max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
137
        free_area_init_nodes(max_zone_pfns);
138
}
139
 
140
void __init mem_init(void)
141
{
142
        unsigned long codesize, reservedpages, datasize, initsize;
143
 
144
        max_mapnr = num_physpages = max_low_pfn;
145
        high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
146
 
147
        /* clear the zero-page */
148
        memset(empty_zero_page, 0, PAGE_SIZE);
149
 
150
        /* this will put all low memory onto the freelists */
151
        totalram_pages += free_all_bootmem();
152
 
153
        reservedpages = 0;
154
 
155
        codesize =  (unsigned long) &_etext - (unsigned long) &_text;
156
        datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
157
        initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
158
        printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
159
                (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
160
                max_mapnr << (PAGE_SHIFT-10),
161
                codesize >> 10,
162
                reservedpages << (PAGE_SHIFT-10),
163
                datasize >>10,
164
                initsize >> 10);
165
        printk("Write protected kernel read-only data: %#lx - %#lx\n",
166
               (unsigned long)&_stext,
167
               PFN_ALIGN((unsigned long)&_eshared) - 1);
168
}
169
 
170
void free_initmem(void)
171
{
172
        unsigned long addr;
173
 
174
        addr = (unsigned long)(&__init_begin);
175
        for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
176
                ClearPageReserved(virt_to_page(addr));
177
                init_page_count(virt_to_page(addr));
178
                memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
179
                free_page(addr);
180
                totalram_pages++;
181
        }
182
        printk ("Freeing unused kernel memory: %ldk freed\n",
183
                ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10);
184
}
185
 
186
#ifdef CONFIG_BLK_DEV_INITRD
187
void free_initrd_mem(unsigned long start, unsigned long end)
188
{
189
        if (start < end)
190
                printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
191
        for (; start < end; start += PAGE_SIZE) {
192
                ClearPageReserved(virt_to_page(start));
193
                init_page_count(virt_to_page(start));
194
                free_page(start);
195
                totalram_pages++;
196
        }
197
}
198
#endif

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.