1 // SPDX-License-Identifier: GPL-2.0-only
5  *  Copyright (C) 1995-2005 Russell King
34 #include <asm/mach/map.h>
44  * zero-initialized data and COW.
50  * The pmd table for the upper-most set of pages.
141 	int i, selected = -1;  in early_cachepolicy()
152 	if (selected == -1)  in early_cachepolicy()
236 	[MT_DEVICE_NONSHARED] = { /* ARMv6 non-shared device */
433 			pr_warn("Forcing write-allocate cache policy for SMP\n");  in build_mem_type_table()
444 	 * Pre-ARMv5 CPUs don't have TEX bits.  Pre-ARMv6 CPUs or those  in build_mem_type_table()
456 	 * "update-able on write" bit on ARM610).  However, Xscale and  in build_mem_type_table()
479 			 * Mark device regions on ARMv6+ as execute-never  in build_mem_type_table()
493 			 * - shared device is SXCB=1100  in build_mem_type_table()
494 			 * - nonshared device is SXCB=0100  in build_mem_type_table()
495 			 * - write combine device mem is SXCB=0001  in build_mem_type_table()
504 			 * - shared device is TEXCB=00101  in build_mem_type_table()
505 			 * - nonshared device is TEXCB=01000  in build_mem_type_table()
506 			 * - write combine device mem is TEXCB=00100  in build_mem_type_table()
515 			 * - shared device is TEXCB=00001  in build_mem_type_table()
516 			 * - nonshared device is TEXCB=01000  in build_mem_type_table()
517 			 * - write combine device mem is TEXCB=00100  in build_mem_type_table()
532 	 * Now deal with the memory-type mappings  in build_mem_type_table()
535 	vecs_pgprot = kern_pgprot = user_pgprot = cp->pte;  in build_mem_type_table()
541 	 * r/o, kernel r/w to map the vectors page.  in build_mem_type_table()
548 	 * in the Short-descriptor translation table format descriptors.  in build_mem_type_table()
594 	 * Non-cacheable Normal - intended for memory areas that must  in build_mem_type_table()
599 			/* Non-cacheable Normal is XCB = 001 */  in build_mem_type_table()
603 			/* For both ARMv6 and non-TEX-remapping ARMv7 */  in build_mem_type_table()
643 	mem_types[MT_MEMORY_RWX].prot_sect |= ecc_mask | cp->pmd;  in build_mem_type_table()
645 	mem_types[MT_MEMORY_RW].prot_sect |= ecc_mask | cp->pmd;  in build_mem_type_table()
649 	mem_types[MT_ROM].prot_sect |= cp->pmd;  in build_mem_type_table()
651 	switch (cp->pmd) {  in build_mem_type_table()
661 		ecc_mask ? "ECC enabled, " : "", cp->policy);  in build_mem_type_table()
665 		if (t->prot_l1)  in build_mem_type_table()
666 			t->prot_l1 |= PMD_DOMAIN(t->domain);  in build_mem_type_table()
667 		if (t->prot_sect)  in build_mem_type_table()
668 			t->prot_sect |= PMD_DOMAIN(t->domain);  in build_mem_type_table()
678 	else if (file->f_flags & O_SYNC)  in phys_mem_access_prot()
731 	pte_t *pte = arm_pte_alloc(pmd, addr, type->prot_l1, alloc);  in alloc_init_pte()
733 		set_pte_ext(pte, pfn_pte(pfn, __pgprot(type->prot_pte)),  in alloc_init_pte()
753 	 * (See arch/arm/include/asm/pgtable-2level.h)  in __map_init_section()
759 		*pmd = __pmd(phys | type->prot_sect | (ng ? PMD_SECT_nG : 0));  in __map_init_section()
776 		 * With LPAE, we must loop over to map  in alloc_init_pmd()
782 		 * Try a section mapping - addr, next and phys must all be  in alloc_init_pmd()
785 		if (type->prot_sect &&  in alloc_init_pmd()
793 		phys += next - addr;  in alloc_init_pmd()
809 		phys += next - addr;  in alloc_init_pud()
824 		phys += next - addr;  in alloc_init_p4d()
838 	addr = md->virtual;  in create_36bit_mapping()
839 	phys = __pfn_to_phys(md->pfn);  in create_36bit_mapping()
840 	length = PAGE_ALIGN(md->length);  in create_36bit_mapping()
844 		       (long long)__pfn_to_phys((u64)md->pfn), addr);  in create_36bit_mapping()
854 	if (type->domain) {  in create_36bit_mapping()
856 		       (long long)__pfn_to_phys((u64)md->pfn), addr);  in create_36bit_mapping()
860 	if ((addr | length | __pfn_to_phys(md->pfn)) & ~SUPERSECTION_MASK) {  in create_36bit_mapping()
862 		       (long long)__pfn_to_phys((u64)md->pfn), addr);  in create_36bit_mapping()
870 	phys |= (((md->pfn >> (32 - PAGE_SHIFT)) & 0xF) << 20);  in create_36bit_mapping()
881 			*pmd++ = __pmd(phys | type->prot_sect | PMD_SECT_SUPER |  in create_36bit_mapping()
900 	type = &mem_types[md->type];  in __create_mapping()
904 	 * Catch 36-bit addresses  in __create_mapping()
906 	if (md->pfn >= 0x100000) {  in __create_mapping()
912 	addr = md->virtual & PAGE_MASK;  in __create_mapping()
913 	phys = __pfn_to_phys(md->pfn);  in __create_mapping()
914 	length = PAGE_ALIGN(md->length + (md->virtual & ~PAGE_MASK));  in __create_mapping()
916 	if (type->prot_l1 == 0 && ((addr | phys | length) & ~SECTION_MASK)) {  in __create_mapping()
917 		pr_warn("BUG: map for 0x%08llx at 0x%08lx can not be mapped using pages, ignoring.\n",  in __create_mapping()
918 			(long long)__pfn_to_phys(md->pfn), addr);  in __create_mapping()
929 		phys += next - addr;  in __create_mapping()
943 	if (md->virtual != vectors_base() && md->virtual < TASK_SIZE) {  in create_mapping()
945 			(long long)__pfn_to_phys((u64)md->pfn), md->virtual);  in create_mapping()
949 	if ((md->type == MT_DEVICE || md->type == MT_ROM) &&  in create_mapping()
950 	    md->virtual >= PAGE_OFFSET && md->virtual < FIXADDR_START &&  in create_mapping()
951 	    (md->virtual < VMALLOC_START || md->virtual >= VMALLOC_END)) {  in create_mapping()
953 			(long long)__pfn_to_phys((u64)md->pfn), md->virtual);  in create_mapping()
966 	p4d = p4d_alloc(mm, pgd_offset(mm, md->virtual), md->virtual);  in create_mapping_late()
969 	pud = pud_alloc(mm, p4d, md->virtual);  in create_mapping_late()
983 	struct vm_struct *vm;  in iotable_init()  local
994 	for (md = io_desc; nr; md++, nr--) {  in iotable_init()
997 		vm = &svm->vm;  in iotable_init()
998 		vm->addr = (void *)(md->virtual & PAGE_MASK);  in iotable_init()
999 		vm->size = PAGE_ALIGN(md->length + (md->virtual & ~PAGE_MASK));  in iotable_init()
1000 		vm->phys_addr = __pfn_to_phys(md->pfn);  in iotable_init()
1001 		vm->flags = VM_IOREMAP | VM_ARM_STATIC_MAPPING;  in iotable_init()
1002 		vm->flags |= VM_ARM_MTYPE(md->type);  in iotable_init()
1003 		vm->caller = iotable_init;  in iotable_init()
1011 	struct vm_struct *vm;  in vm_reserve_area_early()  local
1019 	vm = &svm->vm;  in vm_reserve_area_early()
1020 	vm->addr = (void *)addr;  in vm_reserve_area_early()
1021 	vm->size = size;  in vm_reserve_area_early()
1022 	vm->flags = VM_IOREMAP | VM_ARM_EMPTY_MAPPING;  in vm_reserve_area_early()
1023 	vm->caller = caller;  in vm_reserve_area_early()
1031  * (see definition in include/asm/pgtable-2level.h).  However a call to
1038  * Let's avoid the issue by inserting dummy vm entries covering the unused
1050 	struct vm_struct *vm;  in fill_pmd_gaps()  local
1055 		vm = &svm->vm;  in fill_pmd_gaps()
1056 		addr = (unsigned long)vm->addr;  in fill_pmd_gaps()
1061 		 * Check if this vm starts on an odd section boundary.  in fill_pmd_gaps()
1072 		 * Then check if this vm ends on an odd section boundary.  in fill_pmd_gaps()
1076 		addr += vm->size;  in fill_pmd_gaps()
1083 		/* no need to look at any vm entry until we hit the next PMD */  in fill_pmd_gaps()
1084 		next = (addr + PMD_SIZE - 1) & PMD_MASK;  in fill_pmd_gaps()
1110 	struct map_desc map;  in debug_ll_io_init()  local
1112 	debug_ll_addr(&map.pfn, &map.virtual);  in debug_ll_io_init()
1113 	if (!map.pfn || !map.virtual)  in debug_ll_io_init()
1115 	map.pfn = __phys_to_pfn(map.pfn);  in debug_ll_io_init()
1116 	map.virtual &= PAGE_MASK;  in debug_ll_io_init()
1117 	map.length = PAGE_SIZE;  in debug_ll_io_init()
1118 	map.type = MT_DEVICE;  in debug_ll_io_init()
1119 	iotable_init(&map, 1);  in debug_ll_io_init()
1124 	(void *)(VMALLOC_END - (240 << 20) - VMALLOC_OFFSET);
1129  * area - the default is 240m.
1141 	if (vmalloc_reserve > VMALLOC_END - (PAGE_OFFSET + SZ_32M)) {  in early_vmalloc()
1142 		vmalloc_reserve = VMALLOC_END - (PAGE_OFFSET + SZ_32M);  in early_vmalloc()
1147 	vmalloc_min = (void *)(VMALLOC_END - vmalloc_reserve);  in early_vmalloc()
1162 	 * not affected by wrap-arounds when sizeof(phys_addr_t) == 4.  in adjust_lowmem_bounds()
1167 	vmalloc_limit = (u64)(uintptr_t)vmalloc_min - PAGE_OFFSET + PHYS_OFFSET;  in adjust_lowmem_bounds()
1177 			len = round_up(block_start, PMD_SIZE) - block_start;  in adjust_lowmem_bounds()
1197 			 * Find the first non-pmd-aligned page, and point  in adjust_lowmem_bounds()
1199 			 * limit down to be pmd-aligned, which happens at the  in adjust_lowmem_bounds()
1203 			 * bank can be non-pmd-aligned. The only exception is  in adjust_lowmem_bounds()
1204 			 * that the start of the bank 0 must be section-  in adjust_lowmem_bounds()
1221 	high_memory = __va(arm_lowmem_limit - 1) + 1;  in adjust_lowmem_bounds()
1237 			pr_notice("Ignoring RAM at %pa-%pa\n",  in adjust_lowmem_bounds()
1241 			memblock_remove(memblock_limit, end - memblock_limit);  in adjust_lowmem_bounds()
1260 	/* The XIP kernel is mapped in the module area -- skip over it */  in prepare_page_table()
1261 	addr = ((unsigned long)_exiprom + PMD_SIZE - 1) & PMD_MASK;  in prepare_page_table()
1304 	 * precious DMA-able memory...  in arm_mm_memblock_reserve()
1306 	memblock_reserve(PHYS_OFFSET, __pa(swapper_pg_dir) - PHYS_OFFSET);  in arm_mm_memblock_reserve()
1319 	struct map_desc map;  in devicemaps_init()  local
1337 	 * Map the kernel if it is XIP.  in devicemaps_init()
1341 	map.pfn = __phys_to_pfn(CONFIG_XIP_PHYS_ADDR & SECTION_MASK);  in devicemaps_init()
1342 	map.virtual = MODULES_VADDR;  in devicemaps_init()
1343 	map.length = ((unsigned long)_exiprom - map.virtual + ~SECTION_MASK) & SECTION_MASK;  in devicemaps_init()
1344 	map.type = MT_ROM;  in devicemaps_init()
1345 	create_mapping(&map);  in devicemaps_init()
1349 	 * Map the cache flushing regions.  in devicemaps_init()
1352 	map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS);  in devicemaps_init()
1353 	map.virtual = FLUSH_BASE;  in devicemaps_init()
1354 	map.length = SZ_1M;  in devicemaps_init()
1355 	map.type = MT_CACHECLEAN;  in devicemaps_init()
1356 	create_mapping(&map);  in devicemaps_init()
1359 	map.pfn = __phys_to_pfn(FLUSH_BASE_PHYS + SZ_1M);  in devicemaps_init()
1360 	map.virtual = FLUSH_BASE_MINICACHE;  in devicemaps_init()
1361 	map.length = SZ_1M;  in devicemaps_init()
1362 	map.type = MT_MINICLEAN;  in devicemaps_init()
1363 	create_mapping(&map);  in devicemaps_init()
1367 	 * Create a mapping for the machine vectors at the high-vectors  in devicemaps_init()
1368 	 * location (0xffff0000).  If we aren't using high-vectors, also  in devicemaps_init()
1369 	 * create a mapping at the low-vectors virtual address.  in devicemaps_init()
1371 	map.pfn = __phys_to_pfn(virt_to_phys(vectors));  in devicemaps_init()
1372 	map.virtual = 0xffff0000;  in devicemaps_init()
1373 	map.length = PAGE_SIZE;  in devicemaps_init()
1375 	map.type = MT_HIGH_VECTORS;  in devicemaps_init()
1377 	map.type = MT_LOW_VECTORS;  in devicemaps_init()
1379 	create_mapping(&map);  in devicemaps_init()
1382 		map.virtual = 0;  in devicemaps_init()
1383 		map.length = PAGE_SIZE * 2;  in devicemaps_init()
1384 		map.type = MT_LOW_VECTORS;  in devicemaps_init()
1385 		create_mapping(&map);  in devicemaps_init()
1388 	/* Now create a kernel read-only mapping */  in devicemaps_init()
1389 	map.pfn += 1;  in devicemaps_init()
1390 	map.virtual = 0xffff0000 + PAGE_SIZE;  in devicemaps_init()
1391 	map.length = PAGE_SIZE;  in devicemaps_init()
1392 	map.type = MT_LOW_VECTORS;  in devicemaps_init()
1393 	create_mapping(&map);  in devicemaps_init()
1396 	 * Ask the machine support to map in the statically mapped devices.  in devicemaps_init()
1398 	if (mdesc->map_io)  in devicemaps_init()
1399 		mdesc->map_io();  in devicemaps_init()
1410 	 * any write-allocated cache lines in the vector page are written  in devicemaps_init()
1438 	/* Map all the lowmem memory banks. */  in map_lowmem()
1440 		struct map_desc map;  in map_lowmem()  local
1448 			map.pfn = __phys_to_pfn(start);  in map_lowmem()
1449 			map.virtual = __phys_to_virt(start);  in map_lowmem()
1450 			map.length = end - start;  in map_lowmem()
1451 			map.type = MT_MEMORY_RWX;  in map_lowmem()
1453 			create_mapping(&map);  in map_lowmem()
1455 			map.pfn = __phys_to_pfn(start);  in map_lowmem()
1456 			map.virtual = __phys_to_virt(start);  in map_lowmem()
1457 			map.length = end - start;  in map_lowmem()
1458 			map.type = MT_MEMORY_RW;  in map_lowmem()
1460 			create_mapping(&map);  in map_lowmem()
1464 				map.pfn = __phys_to_pfn(start);  in map_lowmem()
1465 				map.virtual = __phys_to_virt(start);  in map_lowmem()
1466 				map.length = kernel_x_start - start;  in map_lowmem()
1467 				map.type = MT_MEMORY_RW;  in map_lowmem()
1469 				create_mapping(&map);  in map_lowmem()
1472 			map.pfn = __phys_to_pfn(kernel_x_start);  in map_lowmem()
1473 			map.virtual = __phys_to_virt(kernel_x_start);  in map_lowmem()
1474 			map.length = kernel_x_end - kernel_x_start;  in map_lowmem()
1475 			map.type = MT_MEMORY_RWX;  in map_lowmem()
1477 			create_mapping(&map);  in map_lowmem()
1480 				map.pfn = __phys_to_pfn(kernel_x_end);  in map_lowmem()
1481 				map.virtual = __phys_to_virt(kernel_x_end);  in map_lowmem()
1482 				map.length = end - kernel_x_end;  in map_lowmem()
1483 				map.type = MT_MEMORY_RW;  in map_lowmem()
1485 				create_mapping(&map);  in map_lowmem()
1508 	if (!mdesc->pv_fixup)  in early_paging_init()
1511 	offset = mdesc->pv_fixup();  in early_paging_init()
1529 	/* Re-set the phys pfn offset, and the pv offset */  in early_paging_init()
1535 		(&__pv_table_end - &__pv_table_begin) << 2);  in early_paging_init()
1554 	 * Fixup the page tables - this must be in the idmap region as  in early_paging_init()
1561 	/* Re-enable the caches and cacheable TLB walks */  in early_paging_init()
1572 	if (!mdesc->pv_fixup)  in early_paging_init()
1575 	offset = mdesc->pv_fixup();  in early_paging_init()
1590 	unsigned long va = fix_to_virt(__end_of_permanent_fixed_addresses - 1);  in early_fixmap_shutdown()
1598 		struct map_desc map;  in early_fixmap_shutdown()  local
1600 		map.virtual = fix_to_virt(i);  in early_fixmap_shutdown()
1601 		pte = pte_offset_early_fixmap(pmd_off_k(map.virtual), map.virtual);  in early_fixmap_shutdown()
1608 		map.pfn = pte_pfn(*pte);  in early_fixmap_shutdown()
1609 		map.type = MT_DEVICE;  in early_fixmap_shutdown()
1610 		map.length = PAGE_SIZE;  in early_fixmap_shutdown()
1612 		create_mapping(&map);  in early_fixmap_shutdown()