1 // SPDX-License-Identifier: GPL-2.0-only
5  *  Copyright (C) 1995-2005 Russell King
44  * zero-initialized data and COW.
50  * The pmd table for the upper-most set of pages.
158 	int i, selected = -1;  in early_cachepolicy()
169 	if (selected == -1)  in early_cachepolicy()
256 	[MT_DEVICE_NONSHARED] = { /* ARMv6 non-shared device */
458 			pr_warn("Forcing write-allocate cache policy for SMP\n");  in build_mem_type_table()
469 	 * Pre-ARMv5 CPUs don't have TEX bits.  Pre-ARMv6 CPUs or those  in build_mem_type_table()
481 	 * "update-able on write" bit on ARM610).  However, Xscale and  in build_mem_type_table()
504 			 * Mark device regions on ARMv6+ as execute-never  in build_mem_type_table()
517 			 * For ARMv7 with TEX remapping,  in build_mem_type_table()
518 			 * - shared device is SXCB=1100  in build_mem_type_table()
519 			 * - nonshared device is SXCB=0100  in build_mem_type_table()
520 			 * - write combine device mem is SXCB=0001  in build_mem_type_table()
529 			 * - shared device is TEXCB=00101  in build_mem_type_table()
530 			 * - nonshared device is TEXCB=01000  in build_mem_type_table()
531 			 * - write combine device mem is TEXCB=00100  in build_mem_type_table()
539 			 * For ARMv6 and ARMv7 without TEX remapping,  in build_mem_type_table()
540 			 * - shared device is TEXCB=00001  in build_mem_type_table()
541 			 * - nonshared device is TEXCB=01000  in build_mem_type_table()
542 			 * - write combine device mem is TEXCB=00100  in build_mem_type_table()
557 	 * Now deal with the memory-type mappings  in build_mem_type_table()
560 	vecs_pgprot = kern_pgprot = user_pgprot = cp->pte;  in build_mem_type_table()
561 	s2_pgprot = cp->pte_s2;  in build_mem_type_table()
576 	 * in the Short-descriptor translation table format descriptors.  in build_mem_type_table()
623 	 * Non-cacheable Normal - intended for memory areas that must  in build_mem_type_table()
628 			/* Non-cacheable Normal is XCB = 001 */  in build_mem_type_table()
632 			/* For both ARMv6 and non-TEX-remapping ARMv7 */  in build_mem_type_table()
675 	mem_types[MT_MEMORY_RWX].prot_sect |= ecc_mask | cp->pmd;  in build_mem_type_table()
677 	mem_types[MT_MEMORY_RW].prot_sect |= ecc_mask | cp->pmd;  in build_mem_type_table()
681 	mem_types[MT_ROM].prot_sect |= cp->pmd;  in build_mem_type_table()
683 	switch (cp->pmd) {  in build_mem_type_table()
693 		ecc_mask ? "ECC enabled, " : "", cp->policy);  in build_mem_type_table()
697 		if (t->prot_l1)  in build_mem_type_table()
698 			t->prot_l1 |= PMD_DOMAIN(t->domain);  in build_mem_type_table()
699 		if (t->prot_sect)  in build_mem_type_table()
700 			t->prot_sect |= PMD_DOMAIN(t->domain);  in build_mem_type_table()
710 	else if (file->f_flags & O_SYNC)  in phys_mem_access_prot()
763 	pte_t *pte = arm_pte_alloc(pmd, addr, type->prot_l1, alloc);  in alloc_init_pte()
765 		set_pte_ext(pte, pfn_pte(pfn, __pgprot(type->prot_pte)),  in alloc_init_pte()
785 	 * (See arch/arm/include/asm/pgtable-2level.h)  in __map_init_section()
791 		*pmd = __pmd(phys | type->prot_sect | (ng ? PMD_SECT_nG : 0));  in __map_init_section()
814 		 * Try a section mapping - addr, next and phys must all be  in alloc_init_pmd()
817 		if (type->prot_sect &&  in alloc_init_pmd()
825 		phys += next - addr;  in alloc_init_pmd()
841 		phys += next - addr;  in alloc_init_pud()
855 	addr = md->virtual;  in create_36bit_mapping()
856 	phys = __pfn_to_phys(md->pfn);  in create_36bit_mapping()
857 	length = PAGE_ALIGN(md->length);  in create_36bit_mapping()
861 		       (long long)__pfn_to_phys((u64)md->pfn), addr);  in create_36bit_mapping()
871 	if (type->domain) {  in create_36bit_mapping()
873 		       (long long)__pfn_to_phys((u64)md->pfn), addr);  in create_36bit_mapping()
877 	if ((addr | length | __pfn_to_phys(md->pfn)) & ~SUPERSECTION_MASK) {  in create_36bit_mapping()
879 		       (long long)__pfn_to_phys((u64)md->pfn), addr);  in create_36bit_mapping()
887 	phys |= (((md->pfn >> (32 - PAGE_SHIFT)) & 0xF) << 20);  in create_36bit_mapping()
897 			*pmd++ = __pmd(phys | type->prot_sect | PMD_SECT_SUPER |  in create_36bit_mapping()
916 	type = &mem_types[md->type];  in __create_mapping()
920 	 * Catch 36-bit addresses  in __create_mapping()
922 	if (md->pfn >= 0x100000) {  in __create_mapping()
928 	addr = md->virtual & PAGE_MASK;  in __create_mapping()
929 	phys = __pfn_to_phys(md->pfn);  in __create_mapping()
930 	length = PAGE_ALIGN(md->length + (md->virtual & ~PAGE_MASK));  in __create_mapping()
932 	if (type->prot_l1 == 0 && ((addr | phys | length) & ~SECTION_MASK)) {  in __create_mapping()
934 			(long long)__pfn_to_phys(md->pfn), addr);  in __create_mapping()
945 		phys += next - addr;  in __create_mapping()
959 	if (md->virtual != vectors_base() && md->virtual < TASK_SIZE) {  in create_mapping()
961 			(long long)__pfn_to_phys((u64)md->pfn), md->virtual);  in create_mapping()
965 	if ((md->type == MT_DEVICE || md->type == MT_ROM) &&  in create_mapping()
966 	    md->virtual >= PAGE_OFFSET && md->virtual < FIXADDR_START &&  in create_mapping()
967 	    (md->virtual < VMALLOC_START || md->virtual >= VMALLOC_END)) {  in create_mapping()
969 			(long long)__pfn_to_phys((u64)md->pfn), md->virtual);  in create_mapping()
979 	pud_t *pud = pud_alloc(mm, pgd_offset(mm, md->virtual), md->virtual);  in create_mapping_late()
1004 	for (md = io_desc; nr; md++, nr--) {  in iotable_init()
1007 		vm = &svm->vm;  in iotable_init()
1008 		vm->addr = (void *)(md->virtual & PAGE_MASK);  in iotable_init()
1009 		vm->size = PAGE_ALIGN(md->length + (md->virtual & ~PAGE_MASK));  in iotable_init()
1010 		vm->phys_addr = __pfn_to_phys(md->pfn);  in iotable_init()
1011 		vm->flags = VM_IOREMAP | VM_ARM_STATIC_MAPPING;  in iotable_init()
1012 		vm->flags |= VM_ARM_MTYPE(md->type);  in iotable_init()
1013 		vm->caller = iotable_init;  in iotable_init()
1029 	vm = &svm->vm;  in vm_reserve_area_early()
1030 	vm->addr = (void *)addr;  in vm_reserve_area_early()
1031 	vm->size = size;  in vm_reserve_area_early()
1032 	vm->flags = VM_IOREMAP | VM_ARM_EMPTY_MAPPING;  in vm_reserve_area_early()
1033 	vm->caller = caller;  in vm_reserve_area_early()
1041  * (see definition in include/asm/pgtable-2level.h).  However a call to
1065 		vm = &svm->vm;  in fill_pmd_gaps()
1066 		addr = (unsigned long)vm->addr;  in fill_pmd_gaps()
1086 		addr += vm->size;  in fill_pmd_gaps()
1094 		next = (addr + PMD_SIZE - 1) & PMD_MASK;  in fill_pmd_gaps()
1134 	(void *)(VMALLOC_END - (240 << 20) - VMALLOC_OFFSET);
1139  * area - the default is 240m.
1151 	if (vmalloc_reserve > VMALLOC_END - (PAGE_OFFSET + SZ_32M)) {  in early_vmalloc()
1152 		vmalloc_reserve = VMALLOC_END - (PAGE_OFFSET + SZ_32M);  in early_vmalloc()
1157 	vmalloc_min = (void *)(VMALLOC_END - vmalloc_reserve);  in early_vmalloc()
1173 	 * not affected by wrap-arounds when sizeof(phys_addr_t) == 4.  in adjust_lowmem_bounds()
1178 	vmalloc_limit = (u64)(uintptr_t)vmalloc_min - PAGE_OFFSET + PHYS_OFFSET;  in adjust_lowmem_bounds()
1186 			if (!IS_ALIGNED(reg->base, PMD_SIZE)) {  in adjust_lowmem_bounds()
1189 				len = round_up(reg->base, PMD_SIZE) - reg->base;  in adjust_lowmem_bounds()
1190 				memblock_mark_nomap(reg->base, len);  in adjust_lowmem_bounds()
1197 		phys_addr_t block_start = reg->base;  in adjust_lowmem_bounds()
1198 		phys_addr_t block_end = reg->base + reg->size;  in adjust_lowmem_bounds()
1203 		if (reg->base < vmalloc_limit) {  in adjust_lowmem_bounds()
1216 			 * Find the first non-pmd-aligned page, and point  in adjust_lowmem_bounds()
1218 			 * limit down to be pmd-aligned, which happens at the  in adjust_lowmem_bounds()
1222 			 * bank can be non-pmd-aligned. The only exception is  in adjust_lowmem_bounds()
1223 			 * that the start of the bank 0 must be section-  in adjust_lowmem_bounds()
1240 	high_memory = __va(arm_lowmem_limit - 1) + 1;  in adjust_lowmem_bounds()
1256 			pr_notice("Ignoring RAM at %pa-%pa\n",  in adjust_lowmem_bounds()
1260 			memblock_remove(memblock_limit, end - memblock_limit);  in adjust_lowmem_bounds()
1279 	/* The XIP kernel is mapped in the module area -- skip over it */  in prepare_page_table()
1280 	addr = ((unsigned long)_exiprom + PMD_SIZE - 1) & PMD_MASK;  in prepare_page_table()
1323 	 * precious DMA-able memory...  in arm_mm_memblock_reserve()
1325 	memblock_reserve(PHYS_OFFSET, __pa(swapper_pg_dir) - PHYS_OFFSET);  in arm_mm_memblock_reserve()
1362 	map.length = ((unsigned long)_exiprom - map.virtual + ~SECTION_MASK) & SECTION_MASK;  in devicemaps_init()
1386 	 * Create a mapping for the machine vectors at the high-vectors  in devicemaps_init()
1387 	 * location (0xffff0000).  If we aren't using high-vectors, also  in devicemaps_init()
1388 	 * create a mapping at the low-vectors virtual address.  in devicemaps_init()
1407 	/* Now create a kernel read-only mapping */  in devicemaps_init()
1417 	if (mdesc->map_io)  in devicemaps_init()
1418 		mdesc->map_io();  in devicemaps_init()
1429 	 * any write-allocated cache lines in the vector page are written  in devicemaps_init()
1458 		phys_addr_t start = reg->base;  in map_lowmem()
1459 		phys_addr_t end = start + reg->size;  in map_lowmem()
1473 			map.length = end - start;  in map_lowmem()
1480 			map.length = end - start;  in map_lowmem()
1489 				map.length = kernel_x_start - start;  in map_lowmem()
1497 			map.length = kernel_x_end - kernel_x_start;  in map_lowmem()
1505 				map.length = end - kernel_x_end;  in map_lowmem()
1531 	if (!mdesc->pv_fixup)  in early_paging_init()
1534 	offset = mdesc->pv_fixup();  in early_paging_init()
1552 	/* Re-set the phys pfn offset, and the pv offset */  in early_paging_init()
1558 		(&__pv_table_end - &__pv_table_begin) << 2);  in early_paging_init()
1566 	 * allocating into the caches too.  Note that this is ARMv7 LPAE  in early_paging_init()
1577 	 * Fixup the page tables - this must be in the idmap region as  in early_paging_init()
1584 	/* Re-enable the caches and cacheable TLB walks */  in early_paging_init()
1595 	if (!mdesc->pv_fixup)  in early_paging_init()
1598 	offset = mdesc->pv_fixup();  in early_paging_init()
1613 	unsigned long va = fix_to_virt(__end_of_permanent_fixed_addresses - 1);  in early_fixmap_shutdown()
1667 	kimage_voffset = (unsigned long)&kimage_voffset - virt_to_idmap(&kimage_voffset);  in paging_init()