include/asm/memory.h

1 /* SPDX-License-Identifier: GPL-2.0-only */
3  * Based on arch/arm/include/asm/memory.h
5  * Copyright (C) 2000-2002 Russell King
8  * Note: this file should not be included by non-asm/.h files
15 #include <asm/page-def.h>
24  * VMEMMAP_SIZE - allows the whole linear region to be covered by
25  *                a struct page array
27  * If we are configured with a 52-bit kernel VA then our VMEMMAP_SIZE
28  * needs to cover the memory region from the beginning of the 52-bit
29  * PAGE_OFFSET all the way to PAGE_END for 48-bit. This allows us to
31  * of the VMEMMAP where 52-bit support is not available in hardware.
33 #define VMEMMAP_SHIFT	(PAGE_SHIFT - STRUCT_PAGE_MAX_SHIFT)
34 #define VMEMMAP_SIZE	((_PAGE_END(VA_BITS_MIN) - PAGE_OFFSET) >> VMEMMAP_SHIFT)
37  * PAGE_OFFSET - the virtual address of the start of the linear map, at the
39  * PAGE_END - the end of the linear map, where all other kernel mappings begin.
40  * KIMAGE_VADDR - the virtual address of the start of the kernel image.
41  * VA_BITS - the maximum number of bits for virtual addresses.
44 #define _PAGE_OFFSET(va)	(-(UL(1) << (va)))
50 #define VMEMMAP_START		(-(UL(1) << (VA_BITS - VMEMMAP_SHIFT)))
52 #define PCI_IO_END		(VMEMMAP_START - SZ_8M)
53 #define PCI_IO_START		(PCI_IO_END - PCI_IO_SIZE)
54 #define FIXADDR_TOP		(VMEMMAP_START - SZ_32M)
62 #define _PAGE_END(va)		(-(UL(1) << ((va) - 1)))
68  * Generic and Software Tag-Based KASAN modes require 1/8th and 1/16th of the
72  * memory address is defined based on the formula:
81  * Based on this mapping, we define two constants:
90  * KASAN_SHADOW_START is defined second based on KASAN_SHADOW_END. The shadow
99 #define KASAN_SHADOW_END	((UL(1) << (64 - KASAN_SHADOW_SCALE_SHIFT)) + KASAN_SHADOW_OFFSET)
100 #define _KASAN_SHADOW_START(va)	(KASAN_SHADOW_END - (UL(1) << ((va) - KASAN_SHADOW_SCALE_SHIFT)))
112  * VMAP'd stacks are allocated at page granularity, so we must ensure that such
113  * stacks are a multiple of page size.
122 #define THREAD_SIZE_ORDER	(THREAD_SHIFT - PAGE_SHIFT)
173  * Memory types for Stage-2 translation
179  * Memory types for Stage-2 translation when ID_AA64MMFR2_EL1.FWB is 0001
180  * Stage-2 enforces Normal-WB and Device-nGnRE
192  *  Open-coded (swapper_pg_dir - reserved_pg_dir) as this cannot be calculated
198  *  Open-coded (swapper_pg_dir - tramp_pg_dir) as this cannot be calculated
220 /* PHYS_OFFSET - the physical address of the start of memory. */
228 	return (u64)&_text - KIMAGE_VADDR;  in kaslr_offset()
250  * PFNs are used to describe any physical page; this means
253  * This is the PFN of the first RAM page in the kernel
254  * direct-mapped view.  We assume this is the first page
314 #define __is_lm_address(addr)	(((u64)(addr) - PAGE_OFFSET) < (PAGE_END - PAGE_OFFSET))
316 #define __lm_to_phys(addr)	(((addr) - PAGE_OFFSET) + PHYS_OFFSET)
317 #define __kimg_to_phys(addr)	((addr) - kimage_voffset)
334 #define __phys_to_virt(x)	((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET)
338  * Convert a page to/from a physical address
340 #define page_to_phys(page)	(__pfn_to_phys(page_to_pfn(page)))  argument
346  * DMA support - see dma-mapping.h.
361 #include <asm-generic/memory_model.h>
379  *  virt_to_page(x)	convert a _valid_ virtual address to struct page *
394 	u64 __idx = ((u64)__page - VMEMMAP_START) / sizeof(struct page);\
400 	u64 __idx = (__tag_reset((u64)x) - PAGE_OFFSET) / PAGE_SIZE;	\
401 	u64 __addr = VMEMMAP_START + (__idx * sizeof(struct page));	\
402 	(struct page *)__addr;						\