13f65ce4dSChris Zankel /* 23f65ce4dSChris Zankel * arch/xtensa/mm/init.c 33f65ce4dSChris Zankel * 43f65ce4dSChris Zankel * Derived from MIPS, PPC. 53f65ce4dSChris Zankel * 63f65ce4dSChris Zankel * This file is subject to the terms and conditions of the GNU General Public 73f65ce4dSChris Zankel * License. See the file "COPYING" in the main directory of this archive 83f65ce4dSChris Zankel * for more details. 93f65ce4dSChris Zankel * 103f65ce4dSChris Zankel * Copyright (C) 2001 - 2005 Tensilica Inc. 113f65ce4dSChris Zankel * 123f65ce4dSChris Zankel * Chris Zankel <chris@zankel.net> 133f65ce4dSChris Zankel * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com> 143f65ce4dSChris Zankel * Marc Gauthier 153f65ce4dSChris Zankel * Kevin Chea 163f65ce4dSChris Zankel */ 173f65ce4dSChris Zankel 183f65ce4dSChris Zankel #include <linux/kernel.h> 193f65ce4dSChris Zankel #include <linux/errno.h> 203f65ce4dSChris Zankel #include <linux/bootmem.h> 215a0e3ad6STejun Heo #include <linux/gfp.h> 223f65ce4dSChris Zankel #include <linux/swap.h> 236656920bSChris Zankel #include <linux/mman.h> 246656920bSChris Zankel #include <linux/nodemask.h> 256656920bSChris Zankel #include <linux/mm.h> 263f65ce4dSChris Zankel 273f65ce4dSChris Zankel #include <asm/bootparam.h> 283f65ce4dSChris Zankel #include <asm/page.h> 29f022d0faSGeert Uytterhoeven #include <asm/sections.h> 303f65ce4dSChris Zankel 313f65ce4dSChris Zankel /* 323f65ce4dSChris Zankel * mem_reserve(start, end, must_exist) 333f65ce4dSChris Zankel * 343f65ce4dSChris Zankel * Reserve some memory from the memory pool. 353f65ce4dSChris Zankel * 363f65ce4dSChris Zankel * Parameters: 373f65ce4dSChris Zankel * start Start of region, 383f65ce4dSChris Zankel * end End of region, 393f65ce4dSChris Zankel * must_exist Must exist in memory pool. 403f65ce4dSChris Zankel * 413f65ce4dSChris Zankel * Returns: 423f65ce4dSChris Zankel * 0 (memory area couldn't be mapped) 433f65ce4dSChris Zankel * -1 (success) 443f65ce4dSChris Zankel */ 453f65ce4dSChris Zankel 463f65ce4dSChris Zankel int __init mem_reserve(unsigned long start, unsigned long end, int must_exist) 473f65ce4dSChris Zankel { 483f65ce4dSChris Zankel int i; 493f65ce4dSChris Zankel 503f65ce4dSChris Zankel if (start == end) 513f65ce4dSChris Zankel return 0; 523f65ce4dSChris Zankel 533f65ce4dSChris Zankel start = start & PAGE_MASK; 543f65ce4dSChris Zankel end = PAGE_ALIGN(end); 553f65ce4dSChris Zankel 563f65ce4dSChris Zankel for (i = 0; i < sysmem.nr_banks; i++) 573f65ce4dSChris Zankel if (start < sysmem.bank[i].end 583f65ce4dSChris Zankel && end >= sysmem.bank[i].start) 593f65ce4dSChris Zankel break; 603f65ce4dSChris Zankel 613f65ce4dSChris Zankel if (i == sysmem.nr_banks) { 623f65ce4dSChris Zankel if (must_exist) 633f65ce4dSChris Zankel printk (KERN_WARNING "mem_reserve: [0x%0lx, 0x%0lx) " 643f65ce4dSChris Zankel "not in any region!\n", start, end); 653f65ce4dSChris Zankel return 0; 663f65ce4dSChris Zankel } 673f65ce4dSChris Zankel 683f65ce4dSChris Zankel if (start > sysmem.bank[i].start) { 693f65ce4dSChris Zankel if (end < sysmem.bank[i].end) { 703f65ce4dSChris Zankel /* split entry */ 713f65ce4dSChris Zankel if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) 723f65ce4dSChris Zankel panic("meminfo overflow\n"); 733f65ce4dSChris Zankel sysmem.bank[sysmem.nr_banks].start = end; 743f65ce4dSChris Zankel sysmem.bank[sysmem.nr_banks].end = sysmem.bank[i].end; 753f65ce4dSChris Zankel sysmem.nr_banks++; 763f65ce4dSChris Zankel } 773f65ce4dSChris Zankel sysmem.bank[i].end = start; 78c4c4594bSChris Zankel 79c4c4594bSChris Zankel } else if (end < sysmem.bank[i].end) { 803f65ce4dSChris Zankel sysmem.bank[i].start = end; 81c4c4594bSChris Zankel 82c4c4594bSChris Zankel } else { 833f65ce4dSChris Zankel /* remove entry */ 843f65ce4dSChris Zankel sysmem.nr_banks--; 853f65ce4dSChris Zankel sysmem.bank[i].start = sysmem.bank[sysmem.nr_banks].start; 863f65ce4dSChris Zankel sysmem.bank[i].end = sysmem.bank[sysmem.nr_banks].end; 873f65ce4dSChris Zankel } 883f65ce4dSChris Zankel return -1; 893f65ce4dSChris Zankel } 903f65ce4dSChris Zankel 913f65ce4dSChris Zankel 923f65ce4dSChris Zankel /* 93e9d6dca5SMax Filippov * Initialize the bootmem system and give it all low memory we have available. 943f65ce4dSChris Zankel */ 953f65ce4dSChris Zankel 963f65ce4dSChris Zankel void __init bootmem_init(void) 973f65ce4dSChris Zankel { 983f65ce4dSChris Zankel unsigned long pfn; 993f65ce4dSChris Zankel unsigned long bootmap_start, bootmap_size; 1003f65ce4dSChris Zankel int i; 1013f65ce4dSChris Zankel 1023f65ce4dSChris Zankel max_low_pfn = max_pfn = 0; 1033f65ce4dSChris Zankel min_low_pfn = ~0; 1043f65ce4dSChris Zankel 1053f65ce4dSChris Zankel for (i=0; i < sysmem.nr_banks; i++) { 1063f65ce4dSChris Zankel pfn = PAGE_ALIGN(sysmem.bank[i].start) >> PAGE_SHIFT; 1073f65ce4dSChris Zankel if (pfn < min_low_pfn) 1083f65ce4dSChris Zankel min_low_pfn = pfn; 1093f65ce4dSChris Zankel pfn = PAGE_ALIGN(sysmem.bank[i].end - 1) >> PAGE_SHIFT; 1103f65ce4dSChris Zankel if (pfn > max_pfn) 1113f65ce4dSChris Zankel max_pfn = pfn; 1123f65ce4dSChris Zankel } 1133f65ce4dSChris Zankel 1143f65ce4dSChris Zankel if (min_low_pfn > max_pfn) 1153f65ce4dSChris Zankel panic("No memory found!\n"); 1163f65ce4dSChris Zankel 117173d6681SChris Zankel max_low_pfn = max_pfn < MAX_MEM_PFN >> PAGE_SHIFT ? 118173d6681SChris Zankel max_pfn : MAX_MEM_PFN >> PAGE_SHIFT; 1193f65ce4dSChris Zankel 1203f65ce4dSChris Zankel /* Find an area to use for the bootmem bitmap. */ 1213f65ce4dSChris Zankel 122264da9f7SJohannes Weiner bootmap_size = bootmem_bootmap_pages(max_low_pfn - min_low_pfn); 123264da9f7SJohannes Weiner bootmap_size <<= PAGE_SHIFT; 1243f65ce4dSChris Zankel bootmap_start = ~0; 1253f65ce4dSChris Zankel 1263f65ce4dSChris Zankel for (i=0; i<sysmem.nr_banks; i++) 1273f65ce4dSChris Zankel if (sysmem.bank[i].end - sysmem.bank[i].start >= bootmap_size) { 1283f65ce4dSChris Zankel bootmap_start = sysmem.bank[i].start; 1293f65ce4dSChris Zankel break; 1303f65ce4dSChris Zankel } 1313f65ce4dSChris Zankel 1323f65ce4dSChris Zankel if (bootmap_start == ~0UL) 1333f65ce4dSChris Zankel panic("Cannot find %ld bytes for bootmap\n", bootmap_size); 1343f65ce4dSChris Zankel 1353f65ce4dSChris Zankel /* Reserve the bootmem bitmap area */ 1363f65ce4dSChris Zankel 1373f65ce4dSChris Zankel mem_reserve(bootmap_start, bootmap_start + bootmap_size, 1); 1380bef42e5SJohannes Weiner bootmap_size = init_bootmem_node(NODE_DATA(0), 1393f65ce4dSChris Zankel bootmap_start >> PAGE_SHIFT, 1400bef42e5SJohannes Weiner min_low_pfn, 1413f65ce4dSChris Zankel max_low_pfn); 1423f65ce4dSChris Zankel 1433f65ce4dSChris Zankel /* Add all remaining memory pieces into the bootmem map */ 1443f65ce4dSChris Zankel 145e9d6dca5SMax Filippov for (i = 0; i < sysmem.nr_banks; i++) { 146e9d6dca5SMax Filippov if (sysmem.bank[i].start >> PAGE_SHIFT < max_low_pfn) { 147e9d6dca5SMax Filippov unsigned long end = min(max_low_pfn << PAGE_SHIFT, 148e9d6dca5SMax Filippov sysmem.bank[i].end); 1493f65ce4dSChris Zankel free_bootmem(sysmem.bank[i].start, 150e9d6dca5SMax Filippov end - sysmem.bank[i].start); 151e9d6dca5SMax Filippov } 152e9d6dca5SMax Filippov } 1533f65ce4dSChris Zankel 1543f65ce4dSChris Zankel } 1553f65ce4dSChris Zankel 1563f65ce4dSChris Zankel 157e5083a63SJohannes Weiner void __init zones_init(void) 1583f65ce4dSChris Zankel { 1593f65ce4dSChris Zankel unsigned long zones_size[MAX_NR_ZONES]; 1603f65ce4dSChris Zankel int i; 1613f65ce4dSChris Zankel 1623f65ce4dSChris Zankel /* All pages are DMA-able, so we put them all in the DMA zone. */ 1633f65ce4dSChris Zankel 164c947a585SJohannes Weiner zones_size[ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET; 1653f65ce4dSChris Zankel for (i = 1; i < MAX_NR_ZONES; i++) 1663f65ce4dSChris Zankel zones_size[i] = 0; 1673f65ce4dSChris Zankel 1683f65ce4dSChris Zankel #ifdef CONFIG_HIGHMEM 1693f65ce4dSChris Zankel zones_size[ZONE_HIGHMEM] = max_pfn - max_low_pfn; 1703f65ce4dSChris Zankel #endif 1713f65ce4dSChris Zankel 172c947a585SJohannes Weiner free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL); 1733f65ce4dSChris Zankel } 1743f65ce4dSChris Zankel 1753f65ce4dSChris Zankel /* 1763f65ce4dSChris Zankel * Initialize memory pages. 1773f65ce4dSChris Zankel */ 1783f65ce4dSChris Zankel 1793f65ce4dSChris Zankel void __init mem_init(void) 1803f65ce4dSChris Zankel { 181808c2c37SJiang Liu max_mapnr = max_low_pfn - ARCH_PFN_OFFSET; 182c947a585SJohannes Weiner high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); 1833f65ce4dSChris Zankel 184288a60cfSChris Zankel #ifdef CONFIG_HIGHMEM 1853f65ce4dSChris Zankel #error HIGHGMEM not implemented in init.c 1863f65ce4dSChris Zankel #endif 1873f65ce4dSChris Zankel 1880c988534SJiang Liu free_all_bootmem(); 1893f65ce4dSChris Zankel 190808c2c37SJiang Liu mem_init_print_info(NULL); 1913f65ce4dSChris Zankel } 1923f65ce4dSChris Zankel 1933f65ce4dSChris Zankel #ifdef CONFIG_BLK_DEV_INITRD 1943f65ce4dSChris Zankel extern int initrd_is_mapped; 1953f65ce4dSChris Zankel 1963f65ce4dSChris Zankel void free_initrd_mem(unsigned long start, unsigned long end) 1973f65ce4dSChris Zankel { 1987acb2c2eSJiang Liu if (initrd_is_mapped) 199dbe67df4SJiang Liu free_reserved_area((void *)start, (void *)end, -1, "initrd"); 2003f65ce4dSChris Zankel } 2013f65ce4dSChris Zankel #endif 2023f65ce4dSChris Zankel 2033f65ce4dSChris Zankel void free_initmem(void) 2043f65ce4dSChris Zankel { 205dbe67df4SJiang Liu free_initmem_default(-1); 2063f65ce4dSChris Zankel } 207