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. 110e46c111SMax Filippov * Copyright (C) 2014 - 2016 Cadence Design Systems Inc. 123f65ce4dSChris Zankel * 133f65ce4dSChris Zankel * Chris Zankel <chris@zankel.net> 143f65ce4dSChris Zankel * Joe Taylor <joe@tensilica.com, joetylr@yahoo.com> 153f65ce4dSChris Zankel * Marc Gauthier 163f65ce4dSChris Zankel * Kevin Chea 173f65ce4dSChris Zankel */ 183f65ce4dSChris Zankel 193f65ce4dSChris Zankel #include <linux/kernel.h> 203f65ce4dSChris Zankel #include <linux/errno.h> 2157c8a661SMike Rapoport #include <linux/memblock.h> 225a0e3ad6STejun Heo #include <linux/gfp.h> 2365559100SMax Filippov #include <linux/highmem.h> 243f65ce4dSChris Zankel #include <linux/swap.h> 256656920bSChris Zankel #include <linux/mman.h> 266656920bSChris Zankel #include <linux/nodemask.h> 276656920bSChris Zankel #include <linux/mm.h> 284e7c84ecSMax Filippov #include <linux/of_fdt.h> 290b1abd1fSChristoph Hellwig #include <linux/dma-map-ops.h> 303f65ce4dSChris Zankel 313f65ce4dSChris Zankel #include <asm/bootparam.h> 323f65ce4dSChris Zankel #include <asm/page.h> 33f022d0faSGeert Uytterhoeven #include <asm/sections.h> 349ba067f9SMax Filippov #include <asm/sysmem.h> 359ba067f9SMax Filippov 363f65ce4dSChris Zankel /* 37e9d6dca5SMax Filippov * Initialize the bootmem system and give it all low memory we have available. 383f65ce4dSChris Zankel */ 393f65ce4dSChris Zankel 403f65ce4dSChris Zankel void __init bootmem_init(void) 413f65ce4dSChris Zankel { 420e46c111SMax Filippov /* Reserve all memory below PHYS_OFFSET, as memory 43566fb58eSMax Filippov * accounting doesn't work for pages below that address. 44566fb58eSMax Filippov * 450e46c111SMax Filippov * If PHYS_OFFSET is zero reserve page at address 0: 46566fb58eSMax Filippov * successfull allocations should never return NULL. 47566fb58eSMax Filippov */ 48831c4f3dSMarkus Elfring memblock_reserve(0, PHYS_OFFSET ? PHYS_OFFSET : 1); 49566fb58eSMax Filippov 504e7c84ecSMax Filippov early_init_fdt_scan_reserved_mem(); 513f65ce4dSChris Zankel 520e46c111SMax Filippov if (!memblock_phys_mem_size()) 533f65ce4dSChris Zankel panic("No memory found!\n"); 543f65ce4dSChris Zankel 550e46c111SMax Filippov min_low_pfn = PFN_UP(memblock_start_of_DRAM()); 560e46c111SMax Filippov min_low_pfn = max(min_low_pfn, PFN_UP(PHYS_OFFSET)); 570e46c111SMax Filippov max_pfn = PFN_DOWN(memblock_end_of_DRAM()); 58d39af902SMax Filippov max_low_pfn = min(max_pfn, MAX_LOW_PFN); 593f65ce4dSChris Zankel 604e460f65SMax Filippov early_memtest((phys_addr_t)min_low_pfn << PAGE_SHIFT, 614e460f65SMax Filippov (phys_addr_t)max_low_pfn << PAGE_SHIFT); 624e460f65SMax Filippov 630e46c111SMax Filippov memblock_set_current_limit(PFN_PHYS(max_low_pfn)); 649d2ffe5cSMax Filippov dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 653f65ce4dSChris Zankel 660e46c111SMax Filippov memblock_dump_all(); 673f65ce4dSChris Zankel } 683f65ce4dSChris Zankel 693f65ce4dSChris Zankel 70e5083a63SJohannes Weiner void __init zones_init(void) 713f65ce4dSChris Zankel { 723f65ce4dSChris Zankel /* All pages are DMA-able, so we put them all in the DMA zone. */ 73da50c57bSMike Rapoport unsigned long max_zone_pfn[MAX_NR_ZONES] = { 74da50c57bSMike Rapoport [ZONE_NORMAL] = max_low_pfn, 753f65ce4dSChris Zankel #ifdef CONFIG_HIGHMEM 76da50c57bSMike Rapoport [ZONE_HIGHMEM] = max_pfn, 773f65ce4dSChris Zankel #endif 7865559100SMax Filippov }; 79da50c57bSMike Rapoport free_area_init(max_zone_pfn); 803f65ce4dSChris Zankel } 813f65ce4dSChris Zankel 826ac5a11dSMax Filippov static void __init free_highpages(void) 836ac5a11dSMax Filippov { 84cddb5ddfSMike Rapoport #ifdef CONFIG_HIGHMEM 856ac5a11dSMax Filippov unsigned long max_low = max_low_pfn; 86cddb5ddfSMike Rapoport phys_addr_t range_start, range_end; 87cddb5ddfSMike Rapoport u64 i; 886ac5a11dSMax Filippov 896ac5a11dSMax Filippov /* set highmem page free */ 90cddb5ddfSMike Rapoport for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, 91cddb5ddfSMike Rapoport &range_start, &range_end, NULL) { 92cddb5ddfSMike Rapoport unsigned long start = PHYS_PFN(range_start); 93cddb5ddfSMike Rapoport unsigned long end = PHYS_PFN(range_end); 946ac5a11dSMax Filippov 956ac5a11dSMax Filippov /* Ignore complete lowmem entries */ 966ac5a11dSMax Filippov if (end <= max_low) 976ac5a11dSMax Filippov continue; 986ac5a11dSMax Filippov 996ac5a11dSMax Filippov /* Truncate partial highmem entries */ 1006ac5a11dSMax Filippov if (start < max_low) 1016ac5a11dSMax Filippov start = max_low; 1026ac5a11dSMax Filippov 103cddb5ddfSMike Rapoport for (; start < end; start++) 104cddb5ddfSMike Rapoport free_highmem_page(pfn_to_page(start)); 1056ac5a11dSMax Filippov } 1066ac5a11dSMax Filippov #endif 107cddb5ddfSMike Rapoport } 1086ac5a11dSMax Filippov 1093f65ce4dSChris Zankel /* 1103f65ce4dSChris Zankel * Initialize memory pages. 1113f65ce4dSChris Zankel */ 1123f65ce4dSChris Zankel 1133f65ce4dSChris Zankel void __init mem_init(void) 1143f65ce4dSChris Zankel { 1156ac5a11dSMax Filippov free_highpages(); 1163f65ce4dSChris Zankel 11765559100SMax Filippov max_mapnr = max_pfn - ARCH_PFN_OFFSET; 11865559100SMax Filippov high_memory = (void *)__va(max_low_pfn << PAGE_SHIFT); 11965559100SMax Filippov 120c6ffc5caSMike Rapoport memblock_free_all(); 1213f65ce4dSChris Zankel 122808c2c37SJiang Liu mem_init_print_info(NULL); 12365559100SMax Filippov pr_info("virtual kernel memory layout:\n" 124c633544aSMax Filippov #ifdef CONFIG_KASAN 125c633544aSMax Filippov " kasan : 0x%08lx - 0x%08lx (%5lu MB)\n" 126c633544aSMax Filippov #endif 1271af1e8a3SMax Filippov #ifdef CONFIG_MMU 1281af1e8a3SMax Filippov " vmalloc : 0x%08lx - 0x%08lx (%5lu MB)\n" 1291af1e8a3SMax Filippov #endif 13065559100SMax Filippov #ifdef CONFIG_HIGHMEM 13165559100SMax Filippov " pkmap : 0x%08lx - 0x%08lx (%5lu kB)\n" 13265559100SMax Filippov " fixmap : 0x%08lx - 0x%08lx (%5lu kB)\n" 13365559100SMax Filippov #endif 134fed566caSMax Filippov " lowmem : 0x%08lx - 0x%08lx (%5lu MB)\n" 135fed566caSMax Filippov " .text : 0x%08lx - 0x%08lx (%5lu kB)\n" 136fed566caSMax Filippov " .rodata : 0x%08lx - 0x%08lx (%5lu kB)\n" 137fed566caSMax Filippov " .data : 0x%08lx - 0x%08lx (%5lu kB)\n" 138fed566caSMax Filippov " .init : 0x%08lx - 0x%08lx (%5lu kB)\n" 139fed566caSMax Filippov " .bss : 0x%08lx - 0x%08lx (%5lu kB)\n", 140c633544aSMax Filippov #ifdef CONFIG_KASAN 141c633544aSMax Filippov KASAN_SHADOW_START, KASAN_SHADOW_START + KASAN_SHADOW_SIZE, 142c633544aSMax Filippov KASAN_SHADOW_SIZE >> 20, 143c633544aSMax Filippov #endif 1441af1e8a3SMax Filippov #ifdef CONFIG_MMU 1451af1e8a3SMax Filippov VMALLOC_START, VMALLOC_END, 1461af1e8a3SMax Filippov (VMALLOC_END - VMALLOC_START) >> 20, 14765559100SMax Filippov #ifdef CONFIG_HIGHMEM 14865559100SMax Filippov PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE, 14965559100SMax Filippov (LAST_PKMAP*PAGE_SIZE) >> 10, 150*1eb0616cSThomas Gleixner FIXADDR_START, FIXADDR_END, 151*1eb0616cSThomas Gleixner (FIXADDR_END - FIXADDR_START) >> 10, 15265559100SMax Filippov #endif 15365559100SMax Filippov PAGE_OFFSET, PAGE_OFFSET + 15465559100SMax Filippov (max_low_pfn - min_low_pfn) * PAGE_SIZE, 1555a0b1d78SMax Filippov #else 1565a0b1d78SMax Filippov min_low_pfn * PAGE_SIZE, max_low_pfn * PAGE_SIZE, 1575a0b1d78SMax Filippov #endif 158fed566caSMax Filippov ((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20, 159fed566caSMax Filippov (unsigned long)_text, (unsigned long)_etext, 160fed566caSMax Filippov (unsigned long)(_etext - _text) >> 10, 161123b8db8SMax Filippov (unsigned long)__start_rodata, (unsigned long)__end_rodata, 162123b8db8SMax Filippov (unsigned long)(__end_rodata - __start_rodata) >> 10, 163fed566caSMax Filippov (unsigned long)_sdata, (unsigned long)_edata, 164fed566caSMax Filippov (unsigned long)(_edata - _sdata) >> 10, 165fed566caSMax Filippov (unsigned long)__init_begin, (unsigned long)__init_end, 166fed566caSMax Filippov (unsigned long)(__init_end - __init_begin) >> 10, 167fed566caSMax Filippov (unsigned long)__bss_start, (unsigned long)__bss_stop, 168fed566caSMax Filippov (unsigned long)(__bss_stop - __bss_start) >> 10); 1693f65ce4dSChris Zankel } 1703f65ce4dSChris Zankel 17106bd2824SMax Filippov static void __init parse_memmap_one(char *p) 17206bd2824SMax Filippov { 17306bd2824SMax Filippov char *oldp; 17406bd2824SMax Filippov unsigned long start_at, mem_size; 17506bd2824SMax Filippov 17606bd2824SMax Filippov if (!p) 17706bd2824SMax Filippov return; 17806bd2824SMax Filippov 17906bd2824SMax Filippov oldp = p; 18006bd2824SMax Filippov mem_size = memparse(p, &p); 18106bd2824SMax Filippov if (p == oldp) 18206bd2824SMax Filippov return; 18306bd2824SMax Filippov 18406bd2824SMax Filippov switch (*p) { 18506bd2824SMax Filippov case '@': 18606bd2824SMax Filippov start_at = memparse(p + 1, &p); 1870e46c111SMax Filippov memblock_add(start_at, mem_size); 18806bd2824SMax Filippov break; 18906bd2824SMax Filippov 19006bd2824SMax Filippov case '$': 19106bd2824SMax Filippov start_at = memparse(p + 1, &p); 1920e46c111SMax Filippov memblock_reserve(start_at, mem_size); 19306bd2824SMax Filippov break; 19406bd2824SMax Filippov 19506bd2824SMax Filippov case 0: 1960e46c111SMax Filippov memblock_reserve(mem_size, -mem_size); 19706bd2824SMax Filippov break; 19806bd2824SMax Filippov 19906bd2824SMax Filippov default: 20006bd2824SMax Filippov pr_warn("Unrecognized memmap syntax: %s\n", p); 20106bd2824SMax Filippov break; 20206bd2824SMax Filippov } 20306bd2824SMax Filippov } 20406bd2824SMax Filippov 20506bd2824SMax Filippov static int __init parse_memmap_opt(char *str) 20606bd2824SMax Filippov { 20706bd2824SMax Filippov while (str) { 20806bd2824SMax Filippov char *k = strchr(str, ','); 20906bd2824SMax Filippov 21006bd2824SMax Filippov if (k) 21106bd2824SMax Filippov *k++ = 0; 21206bd2824SMax Filippov 21306bd2824SMax Filippov parse_memmap_one(str); 21406bd2824SMax Filippov str = k; 21506bd2824SMax Filippov } 21606bd2824SMax Filippov 21706bd2824SMax Filippov return 0; 21806bd2824SMax Filippov } 21906bd2824SMax Filippov early_param("memmap", parse_memmap_opt); 220