1 /* 2 * fixmap.h: compile-time virtual memory allocation 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 1998 Ingo Molnar 9 * Copyright (C) 2013 Mark Salter <msalter@redhat.com> 10 * 11 * Adapted from arch/x86_64 version. 12 * 13 */ 14 15 #ifndef _ASM_ARM64_FIXMAP_H 16 #define _ASM_ARM64_FIXMAP_H 17 18 #ifndef __ASSEMBLY__ 19 #include <linux/kernel.h> 20 #include <asm/page.h> 21 22 /* 23 * Here we define all the compile-time 'special' virtual 24 * addresses. The point is to have a constant address at 25 * compile time, but to set the physical address only 26 * in the boot process. 27 * 28 * These 'compile-time allocated' memory buffers are 29 * page-sized. Use set_fixmap(idx,phys) to associate 30 * physical memory with fixmap indices. 31 * 32 */ 33 enum fixed_addresses { 34 FIX_HOLE, 35 FIX_EARLYCON_MEM_BASE, 36 #ifdef CONFIG_UNMAP_KERNEL_AT_EL0 37 FIX_ENTRY_TRAMP_DATA, 38 FIX_ENTRY_TRAMP_TEXT, 39 #define TRAMP_VALIAS (__fix_to_virt(FIX_ENTRY_TRAMP_TEXT)) 40 #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */ 41 __end_of_permanent_fixed_addresses, 42 43 /* 44 * Temporary boot-time mappings, used by early_ioremap(), 45 * before ioremap() is functional. 46 */ 47 #ifdef CONFIG_ARM64_64K_PAGES 48 #define NR_FIX_BTMAPS 4 49 #else 50 #define NR_FIX_BTMAPS 64 51 #endif 52 #define FIX_BTMAPS_SLOTS 7 53 #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) 54 55 FIX_BTMAP_END = __end_of_permanent_fixed_addresses, 56 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, 57 FIX_TEXT_POKE0, 58 __end_of_fixed_addresses 59 }; 60 61 #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) 62 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) 63 64 #define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE) 65 66 void __init early_fixmap_init(void); 67 68 #define __early_set_fixmap __set_fixmap 69 70 extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot); 71 72 #include <asm-generic/fixmap.h> 73 74 #endif /* !__ASSEMBLY__ */ 75 #endif /* _ASM_ARM64_FIXMAP_H */ 76