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 __end_of_permanent_fixed_addresses, 37 38 /* 39 * Temporary boot-time mappings, used by early_ioremap(), 40 * before ioremap() is functional. 41 */ 42 #ifdef CONFIG_ARM64_64K_PAGES 43 #define NR_FIX_BTMAPS 4 44 #else 45 #define NR_FIX_BTMAPS 64 46 #endif 47 #define FIX_BTMAPS_SLOTS 7 48 #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) 49 50 FIX_BTMAP_END = __end_of_permanent_fixed_addresses, 51 FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, 52 __end_of_fixed_addresses 53 }; 54 55 #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) 56 #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) 57 58 #define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE) 59 60 void __init early_fixmap_init(void); 61 62 #define __early_set_fixmap __set_fixmap 63 64 extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot); 65 66 #include <asm-generic/fixmap.h> 67 68 #endif /* !__ASSEMBLY__ */ 69 #endif /* _ASM_ARM64_FIXMAP_H */ 70