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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 | /* * arch/s390/mm/init.c * * S390 version * Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation * Author(s): Hartmut Penner (hp@de.ibm.com) * * Derived from "arch/i386/mm/init.c" * Copyright (C) 1995 Linus Torvalds */ #include <linux/config.h> #include <linux/signal.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/types.h> #include <linux/ptrace.h> #include <linux/mman.h> #include <linux/mm.h> #include <linux/swap.h> #include <linux/smp.h> #include <linux/init.h> #ifdef CONFIG_BLK_DEV_INITRD #include <linux/blk.h> #endif #include <linux/pagemap.h> #include <linux/bootmem.h> #include <asm/processor.h> #include <asm/system.h> #include <asm/uaccess.h> #include <asm/pgtable.h> #include <asm/pgalloc.h> #include <asm/dma.h> #include <asm/lowcore.h> #include <asm/tlb.h> mmu_gather_t mmu_gathers[NR_CPUS]; static unsigned long totalram_pages; pgd_t swapper_pg_dir[PTRS_PER_PGD] __attribute__((__aligned__(PAGE_SIZE))); char empty_zero_page[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); int do_check_pgt_cache(int low, int high) { int freed = 0; if(pgtable_cache_size > high) { do { if(pgd_quicklist) { free_pgd_slow(get_pgd_fast()); freed += 2; } if(pmd_quicklist) { pmd_free_slow(pmd_alloc_one_fast(NULL, 0)); freed++; } if(pte_quicklist) { pte_free_slow(pte_alloc_one_fast(NULL, 0)); freed++; } } while(pgtable_cache_size > low); } return freed; } void show_mem(void) { int i, total = 0, reserved = 0; int shared = 0, cached = 0; printk("Mem-info:\n"); show_free_areas(); printk("Free swap: %6dkB\n",nr_swap_pages<<(PAGE_SHIFT-10)); i = max_mapnr; while (i-- > 0) { total++; if (PageReserved(mem_map+i)) reserved++; else if (PageSwapCache(mem_map+i)) cached++; else if (page_count(mem_map+i)) shared += atomic_read(&mem_map[i].count) - 1; } printk("%d pages of RAM\n",total); printk("%d reserved pages\n",reserved); printk("%d pages shared\n",shared); printk("%d pages swap cached\n",cached); printk("%ld pages in page table cache\n",pgtable_cache_size); show_buffers(); } /* References to section boundaries */ extern unsigned long _text; extern unsigned long _etext; extern unsigned long _edata; extern unsigned long __bss_start; extern unsigned long _end; extern unsigned long __init_begin; extern unsigned long __init_end; /* * paging_init() sets up the page tables - note that the first 4MB are * already mapped by head.S. * paging_init will erase this initial mapping */ unsigned long last_valid_pfn; void __init paging_init(void) { pgd_t * pg_dir; pte_t * pg_table; pte_t pte; int i; unsigned long tmp; unsigned long address=0; unsigned long pgdir_k = (__pa(swapper_pg_dir) & PAGE_MASK) | _KERNSEG_TABLE; unsigned long end_mem = (unsigned long) __va(max_low_pfn*PAGE_SIZE); static const int ssm_mask = 0x04000000L; /* unmap whole virtual address space */ pg_dir = swapper_pg_dir; for (i=0;i<KERNEL_PGD_PTRS;i++) pmd_clear((pmd_t*)pg_dir++); /* * map whole physical memory to virtual memory (identity mapping) */ pg_dir = swapper_pg_dir; while (address < end_mem) { /* * pg_table is physical at this point */ pg_table = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); pg_dir->pgd0 = (_PAGE_TABLE | __pa(pg_table)); pg_dir->pgd1 = (_PAGE_TABLE | (__pa(pg_table)+1024)); pg_dir->pgd2 = (_PAGE_TABLE | (__pa(pg_table)+2048)); pg_dir->pgd3 = (_PAGE_TABLE | (__pa(pg_table)+3072)); pg_dir++; for (tmp = 0 ; tmp < PTRS_PER_PTE ; tmp++,pg_table++) { pte = mk_pte_phys(address, PAGE_KERNEL); if (address >= end_mem) pte_clear(&pte); set_pte(pg_table, pte); address += PAGE_SIZE; } } /* enable virtual mapping in kernel mode */ __asm__ __volatile__(" LCTL 1,1,%0\n" " LCTL 7,7,%0\n" " LCTL 13,13,%0\n" " SSM %1" : : "m" (pgdir_k), "m" (ssm_mask)); local_flush_tlb(); { unsigned long zones_size[MAX_NR_ZONES] = { 0, 0, 0}; zones_size[ZONE_DMA] = max_low_pfn; free_area_init(zones_size); } return; } void __init mem_init(void) { int codesize, reservedpages, datasize, initsize; max_mapnr = num_physpages = max_low_pfn; high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); /* clear the zero-page */ memset(empty_zero_page, 0, PAGE_SIZE); /* this will put all low memory onto the freelists */ totalram_pages += free_all_bootmem(); reservedpages = 0; codesize = (unsigned long) &_etext - (unsigned long) &_text; datasize = (unsigned long) &_edata - (unsigned long) &_etext; initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin; printk("Memory: %luk/%luk available (%dk kernel code, %dk reserved, %dk data, %dk init)\n", (unsigned long) nr_free_pages() << (PAGE_SHIFT-10), max_mapnr << (PAGE_SHIFT-10), codesize >> 10, reservedpages << (PAGE_SHIFT-10), datasize >>10, initsize >> 10); } void free_initmem(void) { unsigned long addr; addr = (unsigned long)(&__init_begin); for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { ClearPageReserved(virt_to_page(addr)); set_page_count(virt_to_page(addr), 1); free_page(addr); totalram_pages++; } printk ("Freeing unused kernel memory: %dk freed\n", (&__init_end - &__init_begin) >> 10); } #ifdef CONFIG_BLK_DEV_INITRD void free_initrd_mem(unsigned long start, unsigned long end) { if (start < end) printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10); for (; start < end; start += PAGE_SIZE) { ClearPageReserved(virt_to_page(start)); set_page_count(virt_to_page(start), 1); free_page(start); totalram_pages++; } } #endif void si_meminfo(struct sysinfo *val) { val->totalram = totalram_pages; val->sharedram = 0; val->freeram = nr_free_pages(); val->bufferram = atomic_read(&buffermem_pages); val->totalhigh = 0; val->freehigh = 0; val->mem_unit = PAGE_SIZE; } |