diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/arm64/include/asm/memory.h | 317 |
1 files changed, 317 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h new file mode 100644 index 000000000..56562ff01 --- /dev/null +++ b/arch/arm64/include/asm/memory.h @@ -0,0 +1,317 @@ +/* + * Based on arch/arm/include/asm/memory.h + * + * Copyright (C) 2000-2002 Russell King + * Copyright (C) 2012 ARM Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + * + * Note: this file should not be included by non-asm/.h files + */ +#ifndef __ASM_MEMORY_H +#define __ASM_MEMORY_H + +#include <linux/compiler.h> +#include <linux/const.h> +#include <linux/types.h> +#include <asm/bug.h> +#include <asm/page-def.h> +#include <asm/sizes.h> + +/* + * Size of the PCI I/O space. This must remain a power of two so that + * IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses. + */ +#define PCI_IO_SIZE SZ_16M + +/* + * Log2 of the upper bound of the size of a struct page. Used for sizing + * the vmemmap region only, does not affect actual memory footprint. + * We don't use sizeof(struct page) directly since taking its size here + * requires its definition to be available at this point in the inclusion + * chain, and it may not be a power of 2 in the first place. + */ +#define STRUCT_PAGE_MAX_SHIFT 6 + +/* + * VMEMMAP_SIZE - allows the whole linear region to be covered by + * a struct page array + */ +#define VMEMMAP_SIZE (UL(1) << (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT)) + +/* + * PAGE_OFFSET - the virtual address of the start of the linear map (top + * (VA_BITS - 1)) + * KIMAGE_VADDR - the virtual address of the start of the kernel image + * VA_BITS - the maximum number of bits for virtual addresses. + * VA_START - the first kernel virtual address. + */ +#define VA_BITS (CONFIG_ARM64_VA_BITS) +#define VA_START (UL(0xffffffffffffffff) - \ + (UL(1) << VA_BITS) + 1) +#define PAGE_OFFSET (UL(0xffffffffffffffff) - \ + (UL(1) << (VA_BITS - 1)) + 1) +#define KIMAGE_VADDR (MODULES_END) +#define MODULES_END (MODULES_VADDR + MODULES_VSIZE) +#define MODULES_VADDR (VA_START + KASAN_SHADOW_SIZE) +#define MODULES_VSIZE (SZ_128M) +#define VMEMMAP_START (PAGE_OFFSET - VMEMMAP_SIZE) +#define PCI_IO_END (VMEMMAP_START - SZ_2M) +#define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE) +#define FIXADDR_TOP (PCI_IO_START - SZ_2M) + +#define KERNEL_START _text +#define KERNEL_END _end + +/* + * KASAN requires 1/8th of the kernel virtual address space for the shadow + * region. KASAN can bloat the stack significantly, so double the (minimum) + * stack size when KASAN is in use, and then double it again if KASAN_EXTRA is + * on. + */ +#ifdef CONFIG_KASAN +#define KASAN_SHADOW_SCALE_SHIFT 3 +#define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT)) +#ifdef CONFIG_KASAN_EXTRA +#define KASAN_THREAD_SHIFT 2 +#else +#define KASAN_THREAD_SHIFT 1 +#endif /* CONFIG_KASAN_EXTRA */ +#else +#define KASAN_SHADOW_SIZE (0) +#define KASAN_THREAD_SHIFT 0 +#endif + +#define MIN_THREAD_SHIFT (14 + KASAN_THREAD_SHIFT) + +/* + * VMAP'd stacks are allocated at page granularity, so we must ensure that such + * stacks are a multiple of page size. + */ +#if defined(CONFIG_VMAP_STACK) && (MIN_THREAD_SHIFT < PAGE_SHIFT) +#define THREAD_SHIFT PAGE_SHIFT +#else +#define THREAD_SHIFT MIN_THREAD_SHIFT +#endif + +#if THREAD_SHIFT >= PAGE_SHIFT +#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) +#endif + +#define THREAD_SIZE (UL(1) << THREAD_SHIFT) + +/* + * By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by + * checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry + * assembly. + */ +#ifdef CONFIG_VMAP_STACK +#define THREAD_ALIGN (2 * THREAD_SIZE) +#else +#define THREAD_ALIGN THREAD_SIZE +#endif + +#define IRQ_STACK_SIZE THREAD_SIZE + +#define OVERFLOW_STACK_SIZE SZ_4K + +/* + * Alignment of kernel segments (e.g. .text, .data). + */ +#if defined(CONFIG_DEBUG_ALIGN_RODATA) +/* + * 4 KB granule: 1 level 2 entry + * 16 KB granule: 128 level 3 entries, with contiguous bit + * 64 KB granule: 32 level 3 entries, with contiguous bit + */ +#define SEGMENT_ALIGN SZ_2M +#else +/* + * 4 KB granule: 16 level 3 entries, with contiguous bit + * 16 KB granule: 4 level 3 entries, without contiguous bit + * 64 KB granule: 1 level 3 entry + */ +#define SEGMENT_ALIGN SZ_64K +#endif + +/* + * Memory types available. + */ +#define MT_DEVICE_nGnRnE 0 +#define MT_DEVICE_nGnRE 1 +#define MT_DEVICE_GRE 2 +#define MT_NORMAL_NC 3 +#define MT_NORMAL 4 +#define MT_NORMAL_WT 5 + +/* + * Memory types for Stage-2 translation + */ +#define MT_S2_NORMAL 0xf +#define MT_S2_DEVICE_nGnRE 0x1 + +/* + * Memory types for Stage-2 translation when ID_AA64MMFR2_EL1.FWB is 0001 + * Stage-2 enforces Normal-WB and Device-nGnRE + */ +#define MT_S2_FWB_NORMAL 6 +#define MT_S2_FWB_DEVICE_nGnRE 1 + +#ifdef CONFIG_ARM64_4K_PAGES +#define IOREMAP_MAX_ORDER (PUD_SHIFT) +#else +#define IOREMAP_MAX_ORDER (PMD_SHIFT) +#endif + +#ifdef CONFIG_BLK_DEV_INITRD +#define __early_init_dt_declare_initrd(__start, __end) \ + do { \ + initrd_start = (__start); \ + initrd_end = (__end); \ + } while (0) +#endif + +#ifndef __ASSEMBLY__ + +#include <linux/bitops.h> +#include <linux/mmdebug.h> + +extern s64 memstart_addr; +/* PHYS_OFFSET - the physical address of the start of memory. */ +#define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; }) + +/* the virtual base of the kernel image (minus TEXT_OFFSET) */ +extern u64 kimage_vaddr; + +/* the offset between the kernel virtual and physical mappings */ +extern u64 kimage_voffset; + +static inline unsigned long kaslr_offset(void) +{ + return kimage_vaddr - KIMAGE_VADDR; +} + +/* + * Allow all memory at the discovery stage. We will clip it later. + */ +#define MIN_MEMBLOCK_ADDR 0 +#define MAX_MEMBLOCK_ADDR U64_MAX + +/* + * PFNs are used to describe any physical page; this means + * PFN 0 == physical address 0. + * + * This is the PFN of the first RAM page in the kernel + * direct-mapped view. We assume this is the first page + * of RAM in the mem_map as well. + */ +#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) + +/* + * Physical vs virtual RAM address space conversion. These are + * private definitions which should NOT be used outside memory.h + * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. + */ + + +/* + * The linear kernel range starts in the middle of the virtual adddress + * space. Testing the top bit for the start of the region is a + * sufficient check. + */ +#define __is_lm_address(addr) (!!((addr) & BIT(VA_BITS - 1))) + +#define __lm_to_phys(addr) (((addr) & ~PAGE_OFFSET) + PHYS_OFFSET) +#define __kimg_to_phys(addr) ((addr) - kimage_voffset) + +#define __virt_to_phys_nodebug(x) ({ \ + phys_addr_t __x = (phys_addr_t)(x); \ + __is_lm_address(__x) ? __lm_to_phys(__x) : \ + __kimg_to_phys(__x); \ +}) + +#define __pa_symbol_nodebug(x) __kimg_to_phys((phys_addr_t)(x)) + +#ifdef CONFIG_DEBUG_VIRTUAL +extern phys_addr_t __virt_to_phys(unsigned long x); +extern phys_addr_t __phys_addr_symbol(unsigned long x); +#else +#define __virt_to_phys(x) __virt_to_phys_nodebug(x) +#define __phys_addr_symbol(x) __pa_symbol_nodebug(x) +#endif + +#define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET) +#define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset)) + +/* + * Convert a page to/from a physical address + */ +#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) +#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) + +/* + * Note: Drivers should NOT use these. They are the wrong + * translation for translating DMA addresses. Use the driver + * DMA support - see dma-mapping.h. + */ +#define virt_to_phys virt_to_phys +static inline phys_addr_t virt_to_phys(const volatile void *x) +{ + return __virt_to_phys((unsigned long)(x)); +} + +#define phys_to_virt phys_to_virt +static inline void *phys_to_virt(phys_addr_t x) +{ + return (void *)(__phys_to_virt(x)); +} + +/* + * Drivers should NOT use these either. + */ +#define __pa(x) __virt_to_phys((unsigned long)(x)) +#define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0)) +#define __pa_nodebug(x) __virt_to_phys_nodebug((unsigned long)(x)) +#define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) +#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) +#define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys((unsigned long)(x))) +#define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x)) + +/* + * virt_to_page(k) convert a _valid_ virtual address to struct page * + * virt_addr_valid(k) indicates whether a virtual address is valid + */ +#define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET) + +#ifndef CONFIG_SPARSEMEM_VMEMMAP +#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) +#define _virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) +#else +#define __virt_to_pgoff(kaddr) (((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page)) +#define __page_to_voff(kaddr) (((u64)(kaddr) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page)) + +#define page_to_virt(page) ((void *)((__page_to_voff(page)) | PAGE_OFFSET)) +#define virt_to_page(vaddr) ((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START)) + +#define _virt_addr_valid(kaddr) pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \ + + PHYS_OFFSET) >> PAGE_SHIFT) +#endif +#endif + +#define _virt_addr_is_linear(kaddr) (((u64)(kaddr)) >= PAGE_OFFSET) +#define virt_addr_valid(kaddr) (_virt_addr_is_linear(kaddr) && \ + _virt_addr_valid(kaddr)) + +#include <asm-generic/memory_model.h> + +#endif |