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> 213f65ce4dSChris Zankel #include <linux/bootmem.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> 299d2ffe5cSMax Filippov #include <linux/dma-contiguous.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 */ 480e46c111SMax Filippov if (PHYS_OFFSET) 490e46c111SMax Filippov memblock_reserve(0, PHYS_OFFSET); 50566fb58eSMax Filippov else 510e46c111SMax Filippov memblock_reserve(0, 1); 52566fb58eSMax Filippov 534e7c84ecSMax Filippov early_init_fdt_scan_reserved_mem(); 543f65ce4dSChris Zankel 550e46c111SMax Filippov if (!memblock_phys_mem_size()) 563f65ce4dSChris Zankel panic("No memory found!\n"); 573f65ce4dSChris Zankel 580e46c111SMax Filippov min_low_pfn = PFN_UP(memblock_start_of_DRAM()); 590e46c111SMax Filippov min_low_pfn = max(min_low_pfn, PFN_UP(PHYS_OFFSET)); 600e46c111SMax Filippov max_pfn = PFN_DOWN(memblock_end_of_DRAM()); 61d39af902SMax Filippov max_low_pfn = min(max_pfn, MAX_LOW_PFN); 623f65ce4dSChris Zankel 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. */ 7365559100SMax Filippov unsigned long zones_size[MAX_NR_ZONES] = { 7465559100SMax Filippov [ZONE_DMA] = max_low_pfn - ARCH_PFN_OFFSET, 753f65ce4dSChris Zankel #ifdef CONFIG_HIGHMEM 7665559100SMax Filippov [ZONE_HIGHMEM] = max_pfn - max_low_pfn, 773f65ce4dSChris Zankel #endif 7865559100SMax Filippov }; 79c947a585SJohannes Weiner free_area_init_node(0, zones_size, ARCH_PFN_OFFSET, NULL); 803f65ce4dSChris Zankel } 813f65ce4dSChris Zankel 823f65ce4dSChris Zankel /* 833f65ce4dSChris Zankel * Initialize memory pages. 843f65ce4dSChris Zankel */ 853f65ce4dSChris Zankel 863f65ce4dSChris Zankel void __init mem_init(void) 873f65ce4dSChris Zankel { 88288a60cfSChris Zankel #ifdef CONFIG_HIGHMEM 8965559100SMax Filippov unsigned long tmp; 9065559100SMax Filippov 9165559100SMax Filippov reset_all_zones_managed_pages(); 9265559100SMax Filippov for (tmp = max_low_pfn; tmp < max_pfn; tmp++) 9365559100SMax Filippov free_highmem_page(pfn_to_page(tmp)); 943f65ce4dSChris Zankel #endif 953f65ce4dSChris Zankel 9665559100SMax Filippov max_mapnr = max_pfn - ARCH_PFN_OFFSET; 9765559100SMax Filippov high_memory = (void *)__va(max_low_pfn << PAGE_SHIFT); 9865559100SMax Filippov 990c988534SJiang Liu free_all_bootmem(); 1003f65ce4dSChris Zankel 101808c2c37SJiang Liu mem_init_print_info(NULL); 10265559100SMax Filippov pr_info("virtual kernel memory layout:\n" 1031af1e8a3SMax Filippov #ifdef CONFIG_MMU 1041af1e8a3SMax Filippov " vmalloc : 0x%08lx - 0x%08lx (%5lu MB)\n" 1051af1e8a3SMax Filippov #endif 10665559100SMax Filippov #ifdef CONFIG_HIGHMEM 10765559100SMax Filippov " pkmap : 0x%08lx - 0x%08lx (%5lu kB)\n" 10865559100SMax Filippov " fixmap : 0x%08lx - 0x%08lx (%5lu kB)\n" 10965559100SMax Filippov #endif 1105a0b1d78SMax Filippov " lowmem : 0x%08lx - 0x%08lx (%5lu MB)\n", 1111af1e8a3SMax Filippov #ifdef CONFIG_MMU 1121af1e8a3SMax Filippov VMALLOC_START, VMALLOC_END, 1131af1e8a3SMax Filippov (VMALLOC_END - VMALLOC_START) >> 20, 11465559100SMax Filippov #ifdef CONFIG_HIGHMEM 11565559100SMax Filippov PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE, 11665559100SMax Filippov (LAST_PKMAP*PAGE_SIZE) >> 10, 11765559100SMax Filippov FIXADDR_START, FIXADDR_TOP, 11865559100SMax Filippov (FIXADDR_TOP - FIXADDR_START) >> 10, 11965559100SMax Filippov #endif 12065559100SMax Filippov PAGE_OFFSET, PAGE_OFFSET + 12165559100SMax Filippov (max_low_pfn - min_low_pfn) * PAGE_SIZE, 1225a0b1d78SMax Filippov #else 1235a0b1d78SMax Filippov min_low_pfn * PAGE_SIZE, max_low_pfn * PAGE_SIZE, 1245a0b1d78SMax Filippov #endif 12565559100SMax Filippov ((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20); 1263f65ce4dSChris Zankel } 1273f65ce4dSChris Zankel 1283f65ce4dSChris Zankel #ifdef CONFIG_BLK_DEV_INITRD 1293f65ce4dSChris Zankel extern int initrd_is_mapped; 1303f65ce4dSChris Zankel 1313f65ce4dSChris Zankel void free_initrd_mem(unsigned long start, unsigned long end) 1323f65ce4dSChris Zankel { 1337acb2c2eSJiang Liu if (initrd_is_mapped) 134dbe67df4SJiang Liu free_reserved_area((void *)start, (void *)end, -1, "initrd"); 1353f65ce4dSChris Zankel } 1363f65ce4dSChris Zankel #endif 1373f65ce4dSChris Zankel 1383f65ce4dSChris Zankel void free_initmem(void) 1393f65ce4dSChris Zankel { 140dbe67df4SJiang Liu free_initmem_default(-1); 1413f65ce4dSChris Zankel } 14206bd2824SMax Filippov 14306bd2824SMax Filippov static void __init parse_memmap_one(char *p) 14406bd2824SMax Filippov { 14506bd2824SMax Filippov char *oldp; 14606bd2824SMax Filippov unsigned long start_at, mem_size; 14706bd2824SMax Filippov 14806bd2824SMax Filippov if (!p) 14906bd2824SMax Filippov return; 15006bd2824SMax Filippov 15106bd2824SMax Filippov oldp = p; 15206bd2824SMax Filippov mem_size = memparse(p, &p); 15306bd2824SMax Filippov if (p == oldp) 15406bd2824SMax Filippov return; 15506bd2824SMax Filippov 15606bd2824SMax Filippov switch (*p) { 15706bd2824SMax Filippov case '@': 15806bd2824SMax Filippov start_at = memparse(p + 1, &p); 1590e46c111SMax Filippov memblock_add(start_at, mem_size); 16006bd2824SMax Filippov break; 16106bd2824SMax Filippov 16206bd2824SMax Filippov case '$': 16306bd2824SMax Filippov start_at = memparse(p + 1, &p); 1640e46c111SMax Filippov memblock_reserve(start_at, mem_size); 16506bd2824SMax Filippov break; 16606bd2824SMax Filippov 16706bd2824SMax Filippov case 0: 1680e46c111SMax Filippov memblock_reserve(mem_size, -mem_size); 16906bd2824SMax Filippov break; 17006bd2824SMax Filippov 17106bd2824SMax Filippov default: 17206bd2824SMax Filippov pr_warn("Unrecognized memmap syntax: %s\n", p); 17306bd2824SMax Filippov break; 17406bd2824SMax Filippov } 17506bd2824SMax Filippov } 17606bd2824SMax Filippov 17706bd2824SMax Filippov static int __init parse_memmap_opt(char *str) 17806bd2824SMax Filippov { 17906bd2824SMax Filippov while (str) { 18006bd2824SMax Filippov char *k = strchr(str, ','); 18106bd2824SMax Filippov 18206bd2824SMax Filippov if (k) 18306bd2824SMax Filippov *k++ = 0; 18406bd2824SMax Filippov 18506bd2824SMax Filippov parse_memmap_one(str); 18606bd2824SMax Filippov str = k; 18706bd2824SMax Filippov } 18806bd2824SMax Filippov 18906bd2824SMax Filippov return 0; 19006bd2824SMax Filippov } 19106bd2824SMax Filippov early_param("memmap", parse_memmap_opt); 192