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 12 enum 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 39 static 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 56 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot); 57 void __init early_fixmap_init(void); 58 59 #include <asm-generic/fixmap.h> 60 61 #else 62 early_fixmap_init(void)63 static inline void early_fixmap_init(void) { } 64 65 #endif 66 #endif 67