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/config.h> 13 #include <linux/signal.h> 14 #include <linux/sched.h> 15 #include <linux/kernel.h> 16 #include <linux/errno.h> 17 #include <linux/string.h> 18 #include <linux/types.h> 19 #include <linux/ptrace.h> 20 #include <linux/mman.h> 21 #include <linux/mm.h> 22 #include <linux/swap.h> 23 #include <linux/smp.h> 24 #include <linux/init.h> 25 #include <linux/pagemap.h> 26 #include <linux/bootmem.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 38 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 39 40 pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); 41 char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); 42 43 void diag10(unsigned long addr) 44 { 45 if (addr >= 0x7ff00000) 46 return; 47 #ifdef CONFIG_64BIT 48 asm volatile ( 49 " sam31\n" 50 " diag %0,%0,0x10\n" 51 "0: sam64\n" 52 ".section __ex_table,\"a\"\n" 53 " .align 8\n" 54 " .quad 0b, 0b\n" 55 ".previous\n" 56 : : "a" (addr)); 57 #else 58 asm volatile ( 59 " diag %0,%0,0x10\n" 60 "0:\n" 61 ".section __ex_table,\"a\"\n" 62 " .align 4\n" 63 " .long 0b, 0b\n" 64 ".previous\n" 65 : : "a" (addr)); 66 #endif 67 } 68 69 void show_mem(void) 70 { 71 int i, total = 0, reserved = 0; 72 int shared = 0, cached = 0; 73 74 printk("Mem-info:\n"); 75 show_free_areas(); 76 printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10)); 77 i = max_mapnr; 78 while (i-- > 0) { 79 total++; 80 if (PageReserved(mem_map+i)) 81 reserved++; 82 else if (PageSwapCache(mem_map+i)) 83 cached++; 84 else if (page_count(mem_map+i)) 85 shared += page_count(mem_map+i) - 1; 86 } 87 printk("%d pages of RAM\n",total); 88 printk("%d reserved pages\n",reserved); 89 printk("%d pages shared\n",shared); 90 printk("%d pages swap cached\n",cached); 91 } 92 93 /* References to section boundaries */ 94 95 extern unsigned long _text; 96 extern unsigned long _etext; 97 extern unsigned long _edata; 98 extern unsigned long __bss_start; 99 extern unsigned long _end; 100 101 extern unsigned long __init_begin; 102 extern unsigned long __init_end; 103 104 extern unsigned long __initdata zholes_size[]; 105 /* 106 * paging_init() sets up the page tables 107 */ 108 109 #ifndef CONFIG_64BIT 110 void __init paging_init(void) 111 { 112 pgd_t * pg_dir; 113 pte_t * pg_table; 114 pte_t pte; 115 int i; 116 unsigned long tmp; 117 unsigned long pfn = 0; 118 unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE; 119 static const int ssm_mask = 0x04000000L; 120 121 /* unmap whole virtual address space */ 122 123 pg_dir = swapper_pg_dir; 124 125 for (i=0;i<KERNEL_PGD_PTRS;i++) 126 pmd_clear((pmd_t*)pg_dir++); 127 128 /* 129 * map whole physical memory to virtual memory (identity mapping) 130 */ 131 132 pg_dir = swapper_pg_dir; 133 134 while (pfn < max_low_pfn) { 135 /* 136 * pg_table is physical at this point 137 */ 138 pg_table = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); 139 140 pg_dir->pgd0 = (_PAGE_TABLE | __pa(pg_table)); 141 pg_dir->pgd1 = (_PAGE_TABLE | (__pa(pg_table)+1024)); 142 pg_dir->pgd2 = (_PAGE_TABLE | (__pa(pg_table)+2048)); 143 pg_dir->pgd3 = (_PAGE_TABLE | (__pa(pg_table)+3072)); 144 pg_dir++; 145 146 for (tmp = 0 ; tmp < PTRS_PER_PTE ; tmp++,pg_table++) { 147 pte = pfn_pte(pfn, PAGE_KERNEL); 148 if (pfn >= max_low_pfn) 149 pte_clear(&init_mm, 0, &pte); 150 set_pte(pg_table, pte); 151 pfn++; 152 } 153 } 154 155 S390_lowcore.kernel_asce = pgdir_k; 156 157 /* enable virtual mapping in kernel mode */ 158 __asm__ __volatile__(" LCTL 1,1,%0\n" 159 " LCTL 7,7,%0\n" 160 " LCTL 13,13,%0\n" 161 " SSM %1" 162 : : "m" (pgdir_k), "m" (ssm_mask)); 163 164 local_flush_tlb(); 165 166 { 167 unsigned long zones_size[MAX_NR_ZONES]; 168 169 memset(zones_size, 0, sizeof(zones_size)); 170 zones_size[ZONE_DMA] = max_low_pfn; 171 free_area_init_node(0, &contig_page_data, zones_size, 172 __pa(PAGE_OFFSET) >> PAGE_SHIFT, 173 zholes_size); 174 } 175 return; 176 } 177 178 #else /* CONFIG_64BIT */ 179 void __init paging_init(void) 180 { 181 pgd_t * pg_dir; 182 pmd_t * pm_dir; 183 pte_t * pt_dir; 184 pte_t pte; 185 int i,j,k; 186 unsigned long pfn = 0; 187 unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | 188 _KERN_REGION_TABLE; 189 static const int ssm_mask = 0x04000000L; 190 191 unsigned long zones_size[MAX_NR_ZONES]; 192 unsigned long dma_pfn, high_pfn; 193 194 memset(zones_size, 0, sizeof(zones_size)); 195 dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT; 196 high_pfn = max_low_pfn; 197 198 if (dma_pfn > high_pfn) 199 zones_size[ZONE_DMA] = high_pfn; 200 else { 201 zones_size[ZONE_DMA] = dma_pfn; 202 zones_size[ZONE_NORMAL] = high_pfn - dma_pfn; 203 } 204 205 /* Initialize mem_map[]. */ 206 free_area_init_node(0, &contig_page_data, zones_size, 207 __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size); 208 209 /* 210 * map whole physical memory to virtual memory (identity mapping) 211 */ 212 213 pg_dir = swapper_pg_dir; 214 215 for (i = 0 ; i < PTRS_PER_PGD ; i++,pg_dir++) { 216 217 if (pfn >= max_low_pfn) { 218 pgd_clear(pg_dir); 219 continue; 220 } 221 222 pm_dir = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE*4); 223 pgd_populate(&init_mm, pg_dir, pm_dir); 224 225 for (j = 0 ; j < PTRS_PER_PMD ; j++,pm_dir++) { 226 if (pfn >= max_low_pfn) { 227 pmd_clear(pm_dir); 228 continue; 229 } 230 231 pt_dir = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); 232 pmd_populate_kernel(&init_mm, pm_dir, pt_dir); 233 234 for (k = 0 ; k < PTRS_PER_PTE ; k++,pt_dir++) { 235 pte = pfn_pte(pfn, PAGE_KERNEL); 236 if (pfn >= max_low_pfn) { 237 pte_clear(&init_mm, 0, &pte); 238 continue; 239 } 240 set_pte(pt_dir, pte); 241 pfn++; 242 } 243 } 244 } 245 246 S390_lowcore.kernel_asce = pgdir_k; 247 248 /* enable virtual mapping in kernel mode */ 249 __asm__ __volatile__("lctlg 1,1,%0\n\t" 250 "lctlg 7,7,%0\n\t" 251 "lctlg 13,13,%0\n\t" 252 "ssm %1" 253 : :"m" (pgdir_k), "m" (ssm_mask)); 254 255 local_flush_tlb(); 256 257 return; 258 } 259 #endif /* CONFIG_64BIT */ 260 261 void __init mem_init(void) 262 { 263 unsigned long codesize, reservedpages, datasize, initsize; 264 265 max_mapnr = num_physpages = max_low_pfn; 266 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); 267 268 /* clear the zero-page */ 269 memset(empty_zero_page, 0, PAGE_SIZE); 270 271 /* this will put all low memory onto the freelists */ 272 totalram_pages += free_all_bootmem(); 273 274 reservedpages = 0; 275 276 codesize = (unsigned long) &_etext - (unsigned long) &_text; 277 datasize = (unsigned long) &_edata - (unsigned long) &_etext; 278 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 279 printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", 280 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 281 max_mapnr << (PAGE_SHIFT-10), 282 codesize >> 10, 283 reservedpages << (PAGE_SHIFT-10), 284 datasize >>10, 285 initsize >> 10); 286 } 287 288 void free_initmem(void) 289 { 290 unsigned long addr; 291 292 addr = (unsigned long)(&__init_begin); 293 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { 294 ClearPageReserved(virt_to_page(addr)); 295 set_page_count(virt_to_page(addr), 1); 296 free_page(addr); 297 totalram_pages++; 298 } 299 printk ("Freeing unused kernel memory: %ldk freed\n", 300 ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10); 301 } 302 303 #ifdef CONFIG_BLK_DEV_INITRD 304 void free_initrd_mem(unsigned long start, unsigned long end) 305 { 306 if (start < end) 307 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); 308 for (; start < end; start += PAGE_SIZE) { 309 ClearPageReserved(virt_to_page(start)); 310 set_page_count(virt_to_page(start), 1); 311 free_page(start); 312 totalram_pages++; 313 } 314 } 315 #endif 316