/arch/s390/mm/init.c
C | 310 lines | 229 code | 52 blank | 29 comment | 22 complexity | a3a813e45c0088a3b187edc7f77125c9 MD5 | raw file
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 38DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); 39 40pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); 41char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); 42 43void diag10(unsigned long addr) 44{ 45 if (addr >= 0x7ff00000) 46 return; 47#ifdef __s390x__ 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 69void 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 95extern unsigned long _text; 96extern unsigned long _etext; 97extern unsigned long _edata; 98extern unsigned long __bss_start; 99extern unsigned long _end; 100 101extern unsigned long __init_begin; 102extern unsigned long __init_end; 103 104/* 105 * paging_init() sets up the page tables 106 */ 107 108#ifndef CONFIG_ARCH_S390X 109void __init paging_init(void) 110{ 111 pgd_t * pg_dir; 112 pte_t * pg_table; 113 pte_t pte; 114 int i; 115 unsigned long tmp; 116 unsigned long pfn = 0; 117 unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE; 118 static const int ssm_mask = 0x04000000L; 119 120 /* unmap whole virtual address space */ 121 122 pg_dir = swapper_pg_dir; 123 124 for (i=0;i<KERNEL_PGD_PTRS;i++) 125 pmd_clear((pmd_t*)pg_dir++); 126 127 /* 128 * map whole physical memory to virtual memory (identity mapping) 129 */ 130 131 pg_dir = swapper_pg_dir; 132 133 while (pfn < max_low_pfn) { 134 /* 135 * pg_table is physical at this point 136 */ 137 pg_table = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); 138 139 pg_dir->pgd0 = (_PAGE_TABLE | __pa(pg_table)); 140 pg_dir->pgd1 = (_PAGE_TABLE | (__pa(pg_table)+1024)); 141 pg_dir->pgd2 = (_PAGE_TABLE | (__pa(pg_table)+2048)); 142 pg_dir->pgd3 = (_PAGE_TABLE | (__pa(pg_table)+3072)); 143 pg_dir++; 144 145 for (tmp = 0 ; tmp < PTRS_PER_PTE ; tmp++,pg_table++) { 146 pte = pfn_pte(pfn, PAGE_KERNEL); 147 if (pfn >= max_low_pfn) 148 pte_clear(&init_mm, 0, &pte); 149 set_pte(pg_table, pte); 150 pfn++; 151 } 152 } 153 154 S390_lowcore.kernel_asce = pgdir_k; 155 156 /* enable virtual mapping in kernel mode */ 157 __asm__ __volatile__(" LCTL 1,1,%0\n" 158 " LCTL 7,7,%0\n" 159 " LCTL 13,13,%0\n" 160 " SSM %1" 161 : : "m" (pgdir_k), "m" (ssm_mask)); 162 163 local_flush_tlb(); 164 165 { 166 unsigned long zones_size[MAX_NR_ZONES] = { 0, 0, 0}; 167 168 zones_size[ZONE_DMA] = max_low_pfn; 169 free_area_init(zones_size); 170 } 171 return; 172} 173 174#else /* CONFIG_ARCH_S390X */ 175void __init paging_init(void) 176{ 177 pgd_t * pg_dir; 178 pmd_t * pm_dir; 179 pte_t * pt_dir; 180 pte_t pte; 181 int i,j,k; 182 unsigned long pfn = 0; 183 unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | 184 _KERN_REGION_TABLE; 185 static const int ssm_mask = 0x04000000L; 186 187 unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0}; 188 unsigned long dma_pfn, high_pfn; 189 190 dma_pfn = MAX_DMA_ADDRESS >> PAGE_SHIFT; 191 high_pfn = max_low_pfn; 192 193 if (dma_pfn > high_pfn) 194 zones_size[ZONE_DMA] = high_pfn; 195 else { 196 zones_size[ZONE_DMA] = dma_pfn; 197 zones_size[ZONE_NORMAL] = high_pfn - dma_pfn; 198 } 199 200 /* Initialize mem_map[]. */ 201 free_area_init(zones_size); 202 203 204 /* 205 * map whole physical memory to virtual memory (identity mapping) 206 */ 207 208 pg_dir = swapper_pg_dir; 209 210 for (i = 0 ; i < PTRS_PER_PGD ; i++,pg_dir++) { 211 212 if (pfn >= max_low_pfn) { 213 pgd_clear(pg_dir); 214 continue; 215 } 216 217 pm_dir = (pmd_t *) alloc_bootmem_low_pages(PAGE_SIZE*4); 218 pgd_populate(&init_mm, pg_dir, pm_dir); 219 220 for (j = 0 ; j < PTRS_PER_PMD ; j++,pm_dir++) { 221 if (pfn >= max_low_pfn) { 222 pmd_clear(pm_dir); 223 continue; 224 } 225 226 pt_dir = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); 227 pmd_populate_kernel(&init_mm, pm_dir, pt_dir); 228 229 for (k = 0 ; k < PTRS_PER_PTE ; k++,pt_dir++) { 230 pte = pfn_pte(pfn, PAGE_KERNEL); 231 if (pfn >= max_low_pfn) { 232 pte_clear(&init_mm, 0, &pte); 233 continue; 234 } 235 set_pte(pt_dir, pte); 236 pfn++; 237 } 238 } 239 } 240 241 S390_lowcore.kernel_asce = pgdir_k; 242 243 /* enable virtual mapping in kernel mode */ 244 __asm__ __volatile__("lctlg 1,1,%0\n\t" 245 "lctlg 7,7,%0\n\t" 246 "lctlg 13,13,%0\n\t" 247 "ssm %1" 248 : :"m" (pgdir_k), "m" (ssm_mask)); 249 250 local_flush_tlb(); 251 252 return; 253} 254#endif /* CONFIG_ARCH_S390X */ 255 256void __init mem_init(void) 257{ 258 unsigned long codesize, reservedpages, datasize, initsize; 259 260 max_mapnr = num_physpages = max_low_pfn; 261 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); 262 263 /* clear the zero-page */ 264 memset(empty_zero_page, 0, PAGE_SIZE); 265 266 /* this will put all low memory onto the freelists */ 267 totalram_pages += free_all_bootmem(); 268 269 reservedpages = 0; 270 271 codesize = (unsigned long) &_etext - (unsigned long) &_text; 272 datasize = (unsigned long) &_edata - (unsigned long) &_etext; 273 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; 274 printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n", 275 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), 276 max_mapnr << (PAGE_SHIFT-10), 277 codesize >> 10, 278 reservedpages << (PAGE_SHIFT-10), 279 datasize >>10, 280 initsize >> 10); 281} 282 283void free_initmem(void) 284{ 285 unsigned long addr; 286 287 addr = (unsigned long)(&__init_begin); 288 for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { 289 ClearPageReserved(virt_to_page(addr)); 290 set_page_count(virt_to_page(addr), 1); 291 free_page(addr); 292 totalram_pages++; 293 } 294 printk ("Freeing unused kernel memory: %ldk freed\n", 295 ((unsigned long)&__init_end - (unsigned long)&__init_begin) >> 10); 296} 297 298#ifdef CONFIG_BLK_DEV_INITRD 299void free_initrd_mem(unsigned long start, unsigned long end) 300{ 301 if (start < end) 302 printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); 303 for (; start < end; start += PAGE_SIZE) { 304 ClearPageReserved(virt_to_page(start)); 305 set_page_count(virt_to_page(start), 1); 306 free_page(start); 307 totalram_pages++; 308 } 309} 310#endif