fixmap.h (1881B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _ASM_FIXMAP_H 3#define _ASM_FIXMAP_H 4 5#define FIXADDR_START 0xffc80000UL 6#define FIXADDR_END 0xfff00000UL 7#define FIXADDR_TOP (FIXADDR_END - PAGE_SIZE) 8 9#include <linux/pgtable.h> 10#include <asm/kmap_size.h> 11 12enum fixed_addresses { 13 FIX_EARLYCON_MEM_BASE, 14 __end_of_permanent_fixed_addresses, 15 16 FIX_KMAP_BEGIN = __end_of_permanent_fixed_addresses, 17 FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * NR_CPUS) - 1, 18 19 /* Support writing RO kernel text via kprobes, jump labels, etc. */ 20 FIX_TEXT_POKE0, 21 FIX_TEXT_POKE1, 22 23 __end_of_fixmap_region, 24 25 /* 26 * Share the kmap() region with early_ioremap(): this is guaranteed 27 * not to clash since early_ioremap() is only available before 28 * paging_init(), and kmap() only after. 29 */ 30#define NR_FIX_BTMAPS 32 31#define FIX_BTMAPS_SLOTS 7 32#define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) 33 34 FIX_BTMAP_END = __end_of_permanent_fixed_addresses, 35 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, 36 __end_of_early_ioremap_region 37}; 38 39static const enum fixed_addresses __end_of_fixed_addresses = 40 __end_of_fixmap_region > __end_of_early_ioremap_region ? 41 __end_of_fixmap_region : __end_of_early_ioremap_region; 42 43#define FIXMAP_PAGE_COMMON (L_PTE_YOUNG | L_PTE_PRESENT | L_PTE_XN | L_PTE_DIRTY) 44 45#define FIXMAP_PAGE_NORMAL (pgprot_kernel | L_PTE_XN) 46#define FIXMAP_PAGE_RO (FIXMAP_PAGE_NORMAL | L_PTE_RDONLY) 47 48/* Used by set_fixmap_(io|nocache), both meant for mapping a device */ 49#define FIXMAP_PAGE_IO (FIXMAP_PAGE_COMMON | L_PTE_MT_DEV_SHARED | L_PTE_SHARED) 50#define FIXMAP_PAGE_NOCACHE FIXMAP_PAGE_IO 51 52#define __early_set_fixmap __set_fixmap 53 54#ifdef CONFIG_MMU 55 56void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot); 57void __init early_fixmap_init(void); 58 59#include <asm-generic/fixmap.h> 60 61#else 62 63static inline void early_fixmap_init(void) { } 64 65#endif 66#endif