[S390] Inline assembly cleanup.
[linux-2.6.git] / arch / s390 / mm / init.c
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
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
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>
37 #include <asm/sections.h>
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;
48         asm volatile(
49 #ifdef CONFIG_64BIT
50                 "       sam31\n"
51                 "       diag    %0,%0,0x10\n"
52                 "0:     sam64\n"
53 #else
54                 "       diag    %0,%0,0x10\n"
55                 "0:\n"
56 #endif
57                 EX_TABLE(0b,0b)
58                 : : "a" (addr));
59 }
60
61 void show_mem(void)
62 {
63         int i, total = 0, reserved = 0;
64         int shared = 0, cached = 0;
65
66         printk("Mem-info:\n");
67         show_free_areas();
68         printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
69         i = max_mapnr;
70         while (i-- > 0) {
71                 total++;
72                 if (PageReserved(mem_map+i))
73                         reserved++;
74                 else if (PageSwapCache(mem_map+i))
75                         cached++;
76                 else if (page_count(mem_map+i))
77                         shared += page_count(mem_map+i) - 1;
78         }
79         printk("%d pages of RAM\n",total);
80         printk("%d reserved pages\n",reserved);
81         printk("%d pages shared\n",shared);
82         printk("%d pages swap cached\n",cached);
83 }
84
85 extern unsigned long __initdata zholes_size[];
86 /*
87  * paging_init() sets up the page tables
88  */
89
90 #ifndef CONFIG_64BIT
91 void __init paging_init(void)
92 {
93         pgd_t * pg_dir;
94         pte_t * pg_table;
95         pte_t   pte;
96         int     i;
97         unsigned long tmp;
98         unsigned long pfn = 0;
99         unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE;
100         static const int ssm_mask = 0x04000000L;
101         unsigned long ro_start_pfn, ro_end_pfn;
102         unsigned long zones_size[MAX_NR_ZONES];
103
104         ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata);
105         ro_end_pfn = PFN_UP((unsigned long)&__end_rodata);
106
107         memset(zones_size, 0, sizeof(zones_size));
108         zones_size[ZONE_DMA] = max_low_pfn;
109         free_area_init_node(0, &contig_page_data, zones_size,
110                             __pa(PAGE_OFFSET) >> PAGE_SHIFT,
111                             zholes_size);
112
113         /* unmap whole virtual address space */
114         
115         pg_dir = swapper_pg_dir;
116
117         for (i = 0; i < PTRS_PER_PGD; i++)
118                 pmd_clear((pmd_t *) pg_dir++);
119                 
120         /*
121          * map whole physical memory to virtual memory (identity mapping) 
122          */
123
124         pg_dir = swapper_pg_dir;
125
126         while (pfn < max_low_pfn) {
127                 /*
128                  * pg_table is physical at this point
129                  */
130                 pg_table = (pte_t *) alloc_bootmem_pages(PAGE_SIZE);
131
132                 pmd_populate_kernel(&init_mm, (pmd_t *) pg_dir, pg_table);
133                 pg_dir++;
134
135                 for (tmp = 0 ; tmp < PTRS_PER_PTE ; tmp++,pg_table++) {
136                         if (pfn >= ro_start_pfn && pfn < ro_end_pfn)
137                                 pte = pfn_pte(pfn, __pgprot(_PAGE_RO));
138                         else
139                                 pte = pfn_pte(pfn, PAGE_KERNEL);
140                         if (pfn >= max_low_pfn)
141                                 pte_val(pte) = _PAGE_TYPE_EMPTY;
142                         set_pte(pg_table, pte);
143                         pfn++;
144                 }
145         }
146
147         S390_lowcore.kernel_asce = pgdir_k;
148
149         /* enable virtual mapping in kernel mode */
150         __ctl_load(pgdir_k, 1, 1);
151         __ctl_load(pgdir_k, 7, 7);
152         __ctl_load(pgdir_k, 13, 13);
153         __raw_local_irq_ssm(ssm_mask);
154
155         local_flush_tlb();
156         return;
157 }
158
159 #else /* CONFIG_64BIT */
160
161 void __init paging_init(void)
162 {
163         pgd_t * pg_dir;
164         pmd_t * pm_dir;
165         pte_t * pt_dir;
166         pte_t   pte;
167         int     i,j,k;
168         unsigned long pfn = 0;
169         unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) |
170           _KERN_REGION_TABLE;
171         static const int ssm_mask = 0x04000000L;
172         unsigned long zones_size[MAX_NR_ZONES];
173         unsigned long dma_pfn, high_pfn;
174         unsigned long ro_start_pfn, ro_end_pfn;
175
176         memset(zones_size, 0, sizeof(zones_size));
177         dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT;
178         high_pfn = max_low_pfn;
179         ro_start_pfn = PFN_DOWN((unsigned long)&__start_rodata);
180         ro_end_pfn = PFN_UP((unsigned long)&__end_rodata);
181
182         if (dma_pfn > high_pfn)
183                 zones_size[ZONE_DMA] = high_pfn;
184         else {
185                 zones_size[ZONE_DMA] = dma_pfn;
186                 zones_size[ZONE_NORMAL] = high_pfn - dma_pfn;
187         }
188
189         /* Initialize mem_map[].  */
190         free_area_init_node(0, &contig_page_data, zones_size,
191                             __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size);
192
193         /*
194          * map whole physical memory to virtual memory (identity mapping) 
195          */
196
197         pg_dir = swapper_pg_dir;
198         
199         for (i = 0 ; i < PTRS_PER_PGD ; i++,pg_dir++) {
200         
201                 if (pfn >= max_low_pfn) {
202                         pgd_clear(pg_dir);
203                         continue;
204                 }          
205         
206                 pm_dir = (pmd_t *) alloc_bootmem_pages(PAGE_SIZE * 4);
207                 pgd_populate(&init_mm, pg_dir, pm_dir);
208
209                 for (j = 0 ; j < PTRS_PER_PMD ; j++,pm_dir++) {
210                         if (pfn >= max_low_pfn) {
211                                 pmd_clear(pm_dir);
212                                 continue; 
213                         }          
214                         
215                         pt_dir = (pte_t *) alloc_bootmem_pages(PAGE_SIZE);
216                         pmd_populate_kernel(&init_mm, pm_dir, pt_dir);
217         
218                         for (k = 0 ; k < PTRS_PER_PTE ; k++,pt_dir++) {
219                                 if (pfn >= ro_start_pfn && pfn < ro_end_pfn)
220                                         pte = pfn_pte(pfn, __pgprot(_PAGE_RO));
221                                 else
222                                         pte = pfn_pte(pfn, PAGE_KERNEL);
223                                 if (pfn >= max_low_pfn)
224                                         pte_val(pte) = _PAGE_TYPE_EMPTY;
225                                 set_pte(pt_dir, pte);
226                                 pfn++;
227                         }
228                 }
229         }
230
231         S390_lowcore.kernel_asce = pgdir_k;
232
233         /* enable virtual mapping in kernel mode */
234         __ctl_load(pgdir_k, 1, 1);
235         __ctl_load(pgdir_k, 7, 7);
236         __ctl_load(pgdir_k, 13, 13);
237         __raw_local_irq_ssm(ssm_mask);
238
239         local_flush_tlb();
240
241         return;
242 }
243 #endif /* CONFIG_64BIT */
244
245 void __init mem_init(void)
246 {
247         unsigned long codesize, reservedpages, datasize, initsize;
248
249         max_mapnr = num_physpages = max_low_pfn;
250         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
251
252         /* clear the zero-page */
253         memset(empty_zero_page, 0, PAGE_SIZE);
254
255         /* this will put all low memory onto the freelists */
256         totalram_pages += free_all_bootmem();
257
258         reservedpages = 0;
259
260         codesize =  (unsigned long) &_etext - (unsigned long) &_text;
261         datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
262         initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
263         printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
264                 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
265                 max_mapnr << (PAGE_SHIFT-10),
266                 codesize >> 10,
267                 reservedpages << (PAGE_SHIFT-10),
268                 datasize >>10,
269                 initsize >> 10);
270         printk("Write protected kernel read-only data: %#lx - %#lx\n",
271                (unsigned long)&__start_rodata,
272                PFN_ALIGN((unsigned long)&__end_rodata) - 1);
273 }
274
275 void free_initmem(void)
276 {
277         unsigned long addr;
278
279         addr = (unsigned long)(&__init_begin);
280         for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
281                 ClearPageReserved(virt_to_page(addr));
282                 init_page_count(virt_to_page(addr));
283                 free_page(addr);
284                 totalram_pages++;
285         }
286         printk ("Freeing unused kernel memory: %ldk freed\n",
287                 ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10);
288 }
289
290 #ifdef CONFIG_BLK_DEV_INITRD
291 void free_initrd_mem(unsigned long start, unsigned long end)
292 {
293         if (start < end)
294                 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
295         for (; start < end; start += PAGE_SIZE) {
296                 ClearPageReserved(virt_to_page(start));
297                 init_page_count(virt_to_page(start));
298                 free_page(start);
299                 totalram_pages++;
300         }
301 }
302 #endif