1
2
3
4
5
6
7
8
9
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
40DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
41
42pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE)));
43
44char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE)));
45EXPORT_SYMBOL(empty_zero_page);
46
47
48
49
50void __init paging_init(void)
51{
52 static const int ssm_mask = 0x04000000L;
53 unsigned long max_zone_pfns[MAX_NR_ZONES];
54 unsigned long pgd_type;
55
56 init_mm.pgd = swapper_pg_dir;
57 S390_lowcore.kernel_asce = __pa(init_mm.pgd) & PAGE_MASK;
58#ifdef CONFIG_64BIT
59
60 S390_lowcore.kernel_asce |= _ASCE_TYPE_REGION3 | _ASCE_TABLE_LENGTH;
61 pgd_type = _REGION3_ENTRY_EMPTY;
62#else
63 S390_lowcore.kernel_asce |= _ASCE_TABLE_LENGTH;
64 pgd_type = _SEGMENT_ENTRY_EMPTY;
65#endif
66 clear_table((unsigned long *) init_mm.pgd, pgd_type,
67 sizeof(unsigned long)*2048);
68 vmem_map_init();
69
70
71 __ctl_load(S390_lowcore.kernel_asce, 1, 1);
72 __ctl_load(S390_lowcore.kernel_asce, 7, 7);
73 __ctl_load(S390_lowcore.kernel_asce, 13, 13);
74 __raw_local_irq_ssm(ssm_mask);
75
76 sparse_memory_present_with_active_regions(MAX_NUMNODES);
77 sparse_init();
78 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
79#ifdef CONFIG_ZONE_DMA
80 max_zone_pfns[ZONE_DMA] = PFN_DOWN(MAX_DMA_ADDRESS);
81#endif
82 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
83 free_area_init_nodes(max_zone_pfns);
84}
85
86void __init mem_init(void)
87{
88 unsigned long codesize, reservedpages, datasize, initsize;
89
90 max_mapnr = num_physpages = max_low_pfn;
91 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
92
93
94 memset(empty_zero_page, 0, PAGE_SIZE);
95
96
97 cmma_init();
98
99
100 totalram_pages += free_all_bootmem();
101
102 reservedpages = 0;
103
104 codesize = (unsigned long) &_etext - (unsigned long) &_text;
105 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
106 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
107 printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
108 nr_free_pages() << (PAGE_SHIFT-10),
109 max_mapnr << (PAGE_SHIFT-10),
110 codesize >> 10,
111 reservedpages << (PAGE_SHIFT-10),
112 datasize >>10,
113 initsize >> 10);
114 printk("Write protected kernel read-only data: %#lx - %#lx\n",
115 (unsigned long)&_stext,
116 PFN_ALIGN((unsigned long)&_eshared) - 1);
117}
118
119#ifdef CONFIG_DEBUG_PAGEALLOC
120void kernel_map_pages(struct page *page, int numpages, int enable)
121{
122 pgd_t *pgd;
123 pud_t *pud;
124 pmd_t *pmd;
125 pte_t *pte;
126 unsigned long address;
127 int i;
128
129 for (i = 0; i < numpages; i++) {
130 address = page_to_phys(page + i);
131 pgd = pgd_offset_k(address);
132 pud = pud_offset(pgd, address);
133 pmd = pmd_offset(pud, address);
134 pte = pte_offset_kernel(pmd, address);
135 if (!enable) {
136 ptep_invalidate(&init_mm, address, pte);
137 continue;
138 }
139 *pte = mk_pte_phys(address, __pgprot(_PAGE_TYPE_RW));
140
141 mb();
142 }
143}
144#endif
145
146void free_initmem(void)
147{
148 unsigned long addr;
149
150 addr = (unsigned long)(&__init_begin);
151 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
152 ClearPageReserved(virt_to_page(addr));
153 init_page_count(virt_to_page(addr));
154 memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
155 free_page(addr);
156 totalram_pages++;
157 }
158 printk ("Freeing unused kernel memory: %ldk freed\n",
159 ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10);
160}
161
162#ifdef CONFIG_BLK_DEV_INITRD
163void free_initrd_mem(unsigned long start, unsigned long end)
164{
165 if (start < end)
166 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
167 for (; start < end; start += PAGE_SIZE) {
168 ClearPageReserved(virt_to_page(start));
169 init_page_count(virt_to_page(start));
170 free_page(start);
171 totalram_pages++;
172 }
173}
174#endif
175
176#ifdef CONFIG_MEMORY_HOTPLUG
177int arch_add_memory(int nid, u64 start, u64 size)
178{
179 struct pglist_data *pgdat;
180 struct zone *zone;
181 int rc;
182
183 pgdat = NODE_DATA(nid);
184 zone = pgdat->node_zones + ZONE_MOVABLE;
185 rc = vmem_add_mapping(start, size);
186 if (rc)
187 return rc;
188 rc = __add_pages(nid, zone, PFN_DOWN(start), PFN_DOWN(size));
189 if (rc)
190 vmem_remove_mapping(start, size);
191 return rc;
192}
193#endif
194
