1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/arch/sparc/mm/init.c 4 * 5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu) 6 * Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be) 7 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 8 * Copyright (C) 2000 Anton Blanchard (anton@samba.org) 9 */ 10 11 #include <linux/module.h> 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/initrd.h> 23 #include <linux/init.h> 24 #include <linux/highmem.h> 25 #include <linux/bootmem.h> 26 #include <linux/memblock.h> 27 #include <linux/pagemap.h> 28 #include <linux/poison.h> 29 #include <linux/gfp.h> 30 31 #include <asm/sections.h> 32 #include <asm/page.h> 33 #include <asm/pgtable.h> 34 #include <asm/vaddrs.h> 35 #include <asm/pgalloc.h> /* bug in asm-generic/tlb.h: check_pgt_cache */ 36 #include <asm/setup.h> 37 #include <asm/tlb.h> 38 #include <asm/prom.h> 39 #include <asm/leon.h> 40 41 #include "mm_32.h" 42 43 unsigned long *sparc_valid_addr_bitmap; 44 EXPORT_SYMBOL(sparc_valid_addr_bitmap); 45 46 unsigned long phys_base; 47 EXPORT_SYMBOL(phys_base); 48 49 unsigned long pfn_base; 50 EXPORT_SYMBOL(pfn_base); 51 52 struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1]; 53 54 /* Initial ramdisk setup */ 55 extern unsigned int sparc_ramdisk_image; 56 extern unsigned int sparc_ramdisk_size; 57 58 unsigned long highstart_pfn, highend_pfn; 59 60 unsigned long last_valid_pfn; 61 62 unsigned long calc_highpages(void) 63 { 64 int i; 65 int nr = 0; 66 67 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 68 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 69 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 70 71 if (end_pfn <= max_low_pfn) 72 continue; 73 74 if (start_pfn < max_low_pfn) 75 start_pfn = max_low_pfn; 76 77 nr += end_pfn - start_pfn; 78 } 79 80 return nr; 81 } 82 83 static unsigned long calc_max_low_pfn(void) 84 { 85 int i; 86 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT); 87 unsigned long curr_pfn, last_pfn; 88 89 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT; 90 for (i = 1; sp_banks[i].num_bytes != 0; i++) { 91 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 92 93 if (curr_pfn >= tmp) { 94 if (last_pfn < tmp) 95 tmp = last_pfn; 96 break; 97 } 98 99 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 100 } 101 102 return tmp; 103 } 104 105 static void __init find_ramdisk(unsigned long end_of_phys_memory) 106 { 107 #ifdef CONFIG_BLK_DEV_INITRD 108 unsigned long size; 109 110 /* Now have to check initial ramdisk, so that it won't pass 111 * the end of memory 112 */ 113 if (sparc_ramdisk_image) { 114 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE) 115 sparc_ramdisk_image -= KERNBASE; 116 initrd_start = sparc_ramdisk_image + phys_base; 117 initrd_end = initrd_start + sparc_ramdisk_size; 118 if (initrd_end > end_of_phys_memory) { 119 printk(KERN_CRIT "initrd extends beyond end of memory " 120 "(0x%016lx > 0x%016lx)\ndisabling initrd\n", 121 initrd_end, end_of_phys_memory); 122 initrd_start = 0; 123 } else { 124 /* Reserve the initrd image area. */ 125 size = initrd_end - initrd_start; 126 memblock_reserve(initrd_start, size); 127 128 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET; 129 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET; 130 } 131 } 132 #endif 133 } 134 135 unsigned long __init bootmem_init(unsigned long *pages_avail) 136 { 137 unsigned long start_pfn, bytes_avail, size; 138 unsigned long end_of_phys_memory = 0; 139 unsigned long high_pages = 0; 140 int i; 141 142 memblock_set_bottom_up(true); 143 memblock_allow_resize(); 144 145 bytes_avail = 0UL; 146 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 147 end_of_phys_memory = sp_banks[i].base_addr + 148 sp_banks[i].num_bytes; 149 bytes_avail += sp_banks[i].num_bytes; 150 if (cmdline_memory_size) { 151 if (bytes_avail > cmdline_memory_size) { 152 unsigned long slack = bytes_avail - cmdline_memory_size; 153 154 bytes_avail -= slack; 155 end_of_phys_memory -= slack; 156 157 sp_banks[i].num_bytes -= slack; 158 if (sp_banks[i].num_bytes == 0) { 159 sp_banks[i].base_addr = 0xdeadbeef; 160 } else { 161 memblock_add(sp_banks[i].base_addr, 162 sp_banks[i].num_bytes); 163 sp_banks[i+1].num_bytes = 0; 164 sp_banks[i+1].base_addr = 0xdeadbeef; 165 } 166 break; 167 } 168 } 169 memblock_add(sp_banks[i].base_addr, sp_banks[i].num_bytes); 170 } 171 172 /* Start with page aligned address of last symbol in kernel 173 * image. 174 */ 175 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end)); 176 177 /* Now shift down to get the real physical page frame number. */ 178 start_pfn >>= PAGE_SHIFT; 179 180 max_pfn = end_of_phys_memory >> PAGE_SHIFT; 181 182 max_low_pfn = max_pfn; 183 highstart_pfn = highend_pfn = max_pfn; 184 185 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) { 186 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT); 187 max_low_pfn = calc_max_low_pfn(); 188 high_pages = calc_highpages(); 189 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", 190 high_pages >> (20 - PAGE_SHIFT)); 191 } 192 193 find_ramdisk(end_of_phys_memory); 194 195 /* Reserve the kernel text/data/bss. */ 196 size = (start_pfn << PAGE_SHIFT) - phys_base; 197 memblock_reserve(phys_base, size); 198 199 size = memblock_phys_mem_size() - memblock_reserved_size(); 200 *pages_avail = (size >> PAGE_SHIFT) - high_pages; 201 202 return max_pfn; 203 } 204 205 /* 206 * paging_init() sets up the page tables: We call the MMU specific 207 * init routine based upon the Sun model type on the Sparc. 208 * 209 */ 210 void __init paging_init(void) 211 { 212 srmmu_paging_init(); 213 prom_build_devicetree(); 214 of_fill_in_cpu_data(); 215 device_scan(); 216 } 217 218 static void __init taint_real_pages(void) 219 { 220 int i; 221 222 for (i = 0; sp_banks[i].num_bytes; i++) { 223 unsigned long start, end; 224 225 start = sp_banks[i].base_addr; 226 end = start + sp_banks[i].num_bytes; 227 228 while (start < end) { 229 set_bit(start >> 20, sparc_valid_addr_bitmap); 230 start += PAGE_SIZE; 231 } 232 } 233 } 234 235 static void map_high_region(unsigned long start_pfn, unsigned long end_pfn) 236 { 237 unsigned long tmp; 238 239 #ifdef CONFIG_DEBUG_HIGHMEM 240 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn); 241 #endif 242 243 for (tmp = start_pfn; tmp < end_pfn; tmp++) 244 free_highmem_page(pfn_to_page(tmp)); 245 } 246 247 void __init mem_init(void) 248 { 249 int i; 250 251 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) { 252 prom_printf("BUG: fixmap and pkmap areas overlap\n"); 253 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n", 254 PKMAP_BASE, 255 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE, 256 FIXADDR_START); 257 prom_printf("Please mail sparclinux@vger.kernel.org.\n"); 258 prom_halt(); 259 } 260 261 262 /* Saves us work later. */ 263 memset((void *)empty_zero_page, 0, PAGE_SIZE); 264 265 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5); 266 i += 1; 267 sparc_valid_addr_bitmap = (unsigned long *) 268 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL); 269 270 if (sparc_valid_addr_bitmap == NULL) { 271 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n"); 272 prom_halt(); 273 } 274 memset(sparc_valid_addr_bitmap, 0, i << 2); 275 276 taint_real_pages(); 277 278 max_mapnr = last_valid_pfn - pfn_base; 279 high_memory = __va(max_low_pfn << PAGE_SHIFT); 280 free_all_bootmem(); 281 282 for (i = 0; sp_banks[i].num_bytes != 0; i++) { 283 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT; 284 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT; 285 286 if (end_pfn <= highstart_pfn) 287 continue; 288 289 if (start_pfn < highstart_pfn) 290 start_pfn = highstart_pfn; 291 292 map_high_region(start_pfn, end_pfn); 293 } 294 295 mem_init_print_info(NULL); 296 } 297 298 void free_initmem (void) 299 { 300 free_initmem_default(POISON_FREE_INITMEM); 301 } 302 303 #ifdef CONFIG_BLK_DEV_INITRD 304 void free_initrd_mem(unsigned long start, unsigned long end) 305 { 306 free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM, 307 "initrd"); 308 } 309 #endif 310 311 void sparc_flush_page_to_ram(struct page *page) 312 { 313 unsigned long vaddr = (unsigned long)page_address(page); 314 315 if (vaddr) 316 __flush_page_to_ram(vaddr); 317 } 318 EXPORT_SYMBOL(sparc_flush_page_to_ram); 319