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
bootmem_init(void)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
zones_init(void)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
free_highpages(void)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) {
92b9bc3670SArd Biesheuvel unsigned long start = PFN_UP(range_start);
93b9bc3670SArd Biesheuvel unsigned long end = PFN_DOWN(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
mem_init(void)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
12265559100SMax Filippov pr_info("virtual kernel memory layout:\n"
123c633544aSMax Filippov #ifdef CONFIG_KASAN
124c633544aSMax Filippov " kasan : 0x%08lx - 0x%08lx (%5lu MB)\n"
125c633544aSMax Filippov #endif
1261af1e8a3SMax Filippov #ifdef CONFIG_MMU
1271af1e8a3SMax Filippov " vmalloc : 0x%08lx - 0x%08lx (%5lu MB)\n"
1281af1e8a3SMax Filippov #endif
12965559100SMax Filippov #ifdef CONFIG_HIGHMEM
13065559100SMax Filippov " pkmap : 0x%08lx - 0x%08lx (%5lu kB)\n"
13165559100SMax Filippov " fixmap : 0x%08lx - 0x%08lx (%5lu kB)\n"
13265559100SMax Filippov #endif
133fed566caSMax Filippov " lowmem : 0x%08lx - 0x%08lx (%5lu MB)\n"
134fed566caSMax Filippov " .text : 0x%08lx - 0x%08lx (%5lu kB)\n"
135fed566caSMax Filippov " .rodata : 0x%08lx - 0x%08lx (%5lu kB)\n"
136fed566caSMax Filippov " .data : 0x%08lx - 0x%08lx (%5lu kB)\n"
137fed566caSMax Filippov " .init : 0x%08lx - 0x%08lx (%5lu kB)\n"
138fed566caSMax Filippov " .bss : 0x%08lx - 0x%08lx (%5lu kB)\n",
139c633544aSMax Filippov #ifdef CONFIG_KASAN
140c633544aSMax Filippov KASAN_SHADOW_START, KASAN_SHADOW_START + KASAN_SHADOW_SIZE,
141c633544aSMax Filippov KASAN_SHADOW_SIZE >> 20,
142c633544aSMax Filippov #endif
1431af1e8a3SMax Filippov #ifdef CONFIG_MMU
1441af1e8a3SMax Filippov VMALLOC_START, VMALLOC_END,
1451af1e8a3SMax Filippov (VMALLOC_END - VMALLOC_START) >> 20,
14665559100SMax Filippov #ifdef CONFIG_HIGHMEM
14765559100SMax Filippov PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE,
14865559100SMax Filippov (LAST_PKMAP*PAGE_SIZE) >> 10,
1491eb0616cSThomas Gleixner FIXADDR_START, FIXADDR_END,
1501eb0616cSThomas Gleixner (FIXADDR_END - FIXADDR_START) >> 10,
15165559100SMax Filippov #endif
15265559100SMax Filippov PAGE_OFFSET, PAGE_OFFSET +
15365559100SMax Filippov (max_low_pfn - min_low_pfn) * PAGE_SIZE,
1545a0b1d78SMax Filippov #else
1555a0b1d78SMax Filippov min_low_pfn * PAGE_SIZE, max_low_pfn * PAGE_SIZE,
1565a0b1d78SMax Filippov #endif
157fed566caSMax Filippov ((max_low_pfn - min_low_pfn) * PAGE_SIZE) >> 20,
158fed566caSMax Filippov (unsigned long)_text, (unsigned long)_etext,
159fed566caSMax Filippov (unsigned long)(_etext - _text) >> 10,
160123b8db8SMax Filippov (unsigned long)__start_rodata, (unsigned long)__end_rodata,
161123b8db8SMax Filippov (unsigned long)(__end_rodata - __start_rodata) >> 10,
162fed566caSMax Filippov (unsigned long)_sdata, (unsigned long)_edata,
163fed566caSMax Filippov (unsigned long)(_edata - _sdata) >> 10,
164fed566caSMax Filippov (unsigned long)__init_begin, (unsigned long)__init_end,
165fed566caSMax Filippov (unsigned long)(__init_end - __init_begin) >> 10,
166fed566caSMax Filippov (unsigned long)__bss_start, (unsigned long)__bss_stop,
167fed566caSMax Filippov (unsigned long)(__bss_stop - __bss_start) >> 10);
1683f65ce4dSChris Zankel }
1693f65ce4dSChris Zankel
parse_memmap_one(char * p)17006bd2824SMax Filippov static void __init parse_memmap_one(char *p)
17106bd2824SMax Filippov {
17206bd2824SMax Filippov char *oldp;
17306bd2824SMax Filippov unsigned long start_at, mem_size;
17406bd2824SMax Filippov
17506bd2824SMax Filippov if (!p)
17606bd2824SMax Filippov return;
17706bd2824SMax Filippov
17806bd2824SMax Filippov oldp = p;
17906bd2824SMax Filippov mem_size = memparse(p, &p);
18006bd2824SMax Filippov if (p == oldp)
18106bd2824SMax Filippov return;
18206bd2824SMax Filippov
18306bd2824SMax Filippov switch (*p) {
18406bd2824SMax Filippov case '@':
18506bd2824SMax Filippov start_at = memparse(p + 1, &p);
1860e46c111SMax Filippov memblock_add(start_at, mem_size);
18706bd2824SMax Filippov break;
18806bd2824SMax Filippov
18906bd2824SMax Filippov case '$':
19006bd2824SMax Filippov start_at = memparse(p + 1, &p);
1910e46c111SMax Filippov memblock_reserve(start_at, mem_size);
19206bd2824SMax Filippov break;
19306bd2824SMax Filippov
19406bd2824SMax Filippov case 0:
1950e46c111SMax Filippov memblock_reserve(mem_size, -mem_size);
19606bd2824SMax Filippov break;
19706bd2824SMax Filippov
19806bd2824SMax Filippov default:
19906bd2824SMax Filippov pr_warn("Unrecognized memmap syntax: %s\n", p);
20006bd2824SMax Filippov break;
20106bd2824SMax Filippov }
20206bd2824SMax Filippov }
20306bd2824SMax Filippov
parse_memmap_opt(char * str)20406bd2824SMax Filippov static int __init parse_memmap_opt(char *str)
20506bd2824SMax Filippov {
20606bd2824SMax Filippov while (str) {
20706bd2824SMax Filippov char *k = strchr(str, ',');
20806bd2824SMax Filippov
20906bd2824SMax Filippov if (k)
21006bd2824SMax Filippov *k++ = 0;
21106bd2824SMax Filippov
21206bd2824SMax Filippov parse_memmap_one(str);
21306bd2824SMax Filippov str = k;
21406bd2824SMax Filippov }
21506bd2824SMax Filippov
21606bd2824SMax Filippov return 0;
21706bd2824SMax Filippov }
21806bd2824SMax Filippov early_param("memmap", parse_memmap_opt);
219*2de9eae1SAnshuman Khandual
220*2de9eae1SAnshuman Khandual #ifdef CONFIG_MMU
221*2de9eae1SAnshuman Khandual static const pgprot_t protection_map[16] = {
222*2de9eae1SAnshuman Khandual [VM_NONE] = PAGE_NONE,
223*2de9eae1SAnshuman Khandual [VM_READ] = PAGE_READONLY,
224*2de9eae1SAnshuman Khandual [VM_WRITE] = PAGE_COPY,
225*2de9eae1SAnshuman Khandual [VM_WRITE | VM_READ] = PAGE_COPY,
226*2de9eae1SAnshuman Khandual [VM_EXEC] = PAGE_READONLY_EXEC,
227*2de9eae1SAnshuman Khandual [VM_EXEC | VM_READ] = PAGE_READONLY_EXEC,
228*2de9eae1SAnshuman Khandual [VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC,
229*2de9eae1SAnshuman Khandual [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_EXEC,
230*2de9eae1SAnshuman Khandual [VM_SHARED] = PAGE_NONE,
231*2de9eae1SAnshuman Khandual [VM_SHARED | VM_READ] = PAGE_READONLY,
232*2de9eae1SAnshuman Khandual [VM_SHARED | VM_WRITE] = PAGE_SHARED,
233*2de9eae1SAnshuman Khandual [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
234*2de9eae1SAnshuman Khandual [VM_SHARED | VM_EXEC] = PAGE_READONLY_EXEC,
235*2de9eae1SAnshuman Khandual [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY_EXEC,
236*2de9eae1SAnshuman Khandual [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_EXEC,
237*2de9eae1SAnshuman Khandual [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_EXEC
238*2de9eae1SAnshuman Khandual };
239*2de9eae1SAnshuman Khandual DECLARE_VM_GET_PAGE_PROT
240*2de9eae1SAnshuman Khandual #endif
241