Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
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 | ||
1da177e4 LT |
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> | |
d882b172 | 26 | #include <linux/pfn.h> |
1da177e4 LT |
27 | |
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> | |
33 | #include <asm/dma.h> | |
34 | #include <asm/lowcore.h> | |
35 | #include <asm/tlb.h> | |
36 | #include <asm/tlbflush.h> | |
d882b172 | 37 | #include <asm/sections.h> |
1da177e4 LT |
38 | |
39 | DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); | |
40 | ||
41 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); | |
42 | char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); | |
43 | ||
44 | void diag10(unsigned long addr) | |
45 | { | |
46 | if (addr >= 0x7ff00000) | |
47 | return; | |
94c12cc7 | 48 | asm volatile( |
347a8dc3 | 49 | #ifdef CONFIG_64BIT |
94c12cc7 MS |
50 | " sam31\n" |
51 | " diag %0,%0,0x10\n" | |
52 | "0: sam64\n" | |
1da177e4 | 53 | #else |
94c12cc7 | 54 | " diag %0,%0,0x10\n" |
1da177e4 | 55 | "0:\n" |
1da177e4 | 56 | #endif |
94c12cc7 MS |
57 | EX_TABLE(0b,0b) |
58 | : : "a" (addr)); | |
1da177e4 LT |
59 | } |
60 | ||
61 | void show_mem(void) | |
62 | { | |
63 | int i, total = 0, reserved = 0; | |
64 | int shared = 0, cached = 0; | |
0b2b6e1d | 65 | struct page *page; |
1da177e4 LT |
66 | |
67 | printk("Mem-info:\n"); | |
68 | show_free_areas(); | |
69 | printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); | |
70 | i = max_mapnr; | |
71 | while (i-- > 0) { | |
f4eb07c1 HC |
72 | if (!pfn_valid(i)) |
73 | continue; | |
0b2b6e1d | 74 | page = pfn_to_page(i); |
1da177e4 | 75 | total++; |
0b2b6e1d | 76 | if (PageReserved(page)) |
1da177e4 | 77 | reserved++; |
0b2b6e1d | 78 | else if (PageSwapCache(page)) |
1da177e4 | 79 | cached++; |
0b2b6e1d HC |
80 | else if (page_count(page)) |
81 | shared += page_count(page) - 1; | |
1da177e4 LT |
82 | } |
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); | |
87 | } | |
88 | ||
f4eb07c1 HC |
89 | static void __init setup_ro_region(void) |
90 | { | |
91 | pgd_t *pgd; | |
92 | pmd_t *pmd; | |
93 | pte_t *pte; | |
94 | pte_t new_pte; | |
95 | unsigned long address, end; | |
96 | ||
97 | address = ((unsigned long)&__start_rodata) & PAGE_MASK; | |
98 | end = PFN_ALIGN((unsigned long)&__end_rodata); | |
99 | ||
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); | |
106 | } | |
107 | } | |
108 | ||
bcc8bcb1 | 109 | extern unsigned long __initdata zholes_size[]; |
f4eb07c1 | 110 | extern void vmem_map_init(void); |
1da177e4 LT |
111 | /* |
112 | * paging_init() sets up the page tables | |
113 | */ | |
1da177e4 LT |
114 | void __init paging_init(void) |
115 | { | |
f4eb07c1 HC |
116 | pgd_t *pg_dir; |
117 | int i; | |
118 | unsigned long pgdir_k; | |
119 | static const int ssm_mask = 0x04000000L; | |
bcc8bcb1 | 120 | unsigned long zones_size[MAX_NR_ZONES]; |
f4eb07c1 | 121 | unsigned long dma_pfn, high_pfn; |
d882b172 | 122 | |
f4eb07c1 | 123 | pg_dir = swapper_pg_dir; |
1da177e4 | 124 | |
f4eb07c1 HC |
125 | #ifdef CONFIG_64BIT |
126 | pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERN_REGION_TABLE; | |
9282ed92 | 127 | for (i = 0; i < PTRS_PER_PGD; i++) |
f4eb07c1 HC |
128 | pgd_clear(pg_dir + i); |
129 | #else | |
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)); | |
133 | #endif | |
134 | vmem_map_init(); | |
135 | setup_ro_region(); | |
1da177e4 LT |
136 | |
137 | S390_lowcore.kernel_asce = pgdir_k; | |
138 | ||
139 | /* enable virtual mapping in kernel mode */ | |
94c12cc7 MS |
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); | |
1da177e4 | 144 | |
bcc8bcb1 HC |
145 | memset(zones_size, 0, sizeof(zones_size)); |
146 | dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT; | |
147 | high_pfn = max_low_pfn; | |
1da177e4 | 148 | |
bcc8bcb1 HC |
149 | if (dma_pfn > high_pfn) |
150 | zones_size[ZONE_DMA] = high_pfn; | |
151 | else { | |
152 | zones_size[ZONE_DMA] = dma_pfn; | |
153 | zones_size[ZONE_NORMAL] = high_pfn - dma_pfn; | |
154 | } | |
155 | ||
156 | /* Initialize mem_map[]. */ | |
157 | free_area_init_node(0, &contig_page_data, zones_size, | |
158 | __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size); | |
1da177e4 | 159 | } |
1da177e4 LT |
160 | |
161 | void __init mem_init(void) | |
162 | { | |
163 | unsigned long codesize, reservedpages, datasize, initsize; | |
164 | ||
165 | max_mapnr = num_physpages = max_low_pfn; | |
166 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); | |
167 | ||
168 | /* clear the zero-page */ | |
169 | memset(empty_zero_page, 0, PAGE_SIZE); | |
170 | ||
171 | /* this will put all low memory onto the freelists */ | |
172 | totalram_pages += free_all_bootmem(); | |
173 | ||
174 | reservedpages = 0; | |
175 | ||
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), | |
182 | codesize >> 10, | |
183 | reservedpages << (PAGE_SHIFT-10), | |
184 | datasize >>10, | |
185 | initsize >> 10); | |
d882b172 HC |
186 | printk("Write protected kernel read-only data: %#lx - %#lx\n", |
187 | (unsigned long)&__start_rodata, | |
188 | PFN_ALIGN((unsigned long)&__end_rodata) - 1); | |
f4eb07c1 HC |
189 | printk("Virtual memmap size: %ldk\n", |
190 | (max_pfn * sizeof(struct page)) >> 10); | |
1da177e4 LT |
191 | } |
192 | ||
193 | void free_initmem(void) | |
194 | { | |
195 | unsigned long addr; | |
196 | ||
197 | addr = (unsigned long)(&__init_begin); | |
198 | for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { | |
199 | ClearPageReserved(virt_to_page(addr)); | |
7835e98b | 200 | init_page_count(virt_to_page(addr)); |
1da177e4 LT |
201 | free_page(addr); |
202 | totalram_pages++; | |
203 | } | |
204 | printk ("Freeing unused kernel memory: %ldk freed\n", | |
205 | ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10); | |
206 | } | |
207 | ||
208 | #ifdef CONFIG_BLK_DEV_INITRD | |
209 | void free_initrd_mem(unsigned long start, unsigned long end) | |
210 | { | |
211 | if (start < 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)); | |
7835e98b | 215 | init_page_count(virt_to_page(start)); |
1da177e4 LT |
216 | free_page(start); |
217 | totalram_pages++; | |
218 | } | |
219 | } | |
220 | #endif |