1bf4b558eSMark Salter /* 2bf4b558eSMark Salter * fixmap.h: compile-time virtual memory allocation 3bf4b558eSMark Salter * 4bf4b558eSMark Salter * This file is subject to the terms and conditions of the GNU General Public 5bf4b558eSMark Salter * License. See the file "COPYING" in the main directory of this archive 6bf4b558eSMark Salter * for more details. 7bf4b558eSMark Salter * 8bf4b558eSMark Salter * Copyright (C) 1998 Ingo Molnar 9bf4b558eSMark Salter * Copyright (C) 2013 Mark Salter <msalter@redhat.com> 10bf4b558eSMark Salter * 11bf4b558eSMark Salter * Adapted from arch/x86_64 version. 12bf4b558eSMark Salter * 13bf4b558eSMark Salter */ 14bf4b558eSMark Salter 15bf4b558eSMark Salter #ifndef _ASM_ARM64_FIXMAP_H 16bf4b558eSMark Salter #define _ASM_ARM64_FIXMAP_H 17bf4b558eSMark Salter 18bf4b558eSMark Salter #ifndef __ASSEMBLY__ 19bf4b558eSMark Salter #include <linux/kernel.h> 2061bd93ceSArd Biesheuvel #include <asm/boot.h> 21bf4b558eSMark Salter #include <asm/page.h> 22bf4b558eSMark Salter 23bf4b558eSMark Salter /* 24bf4b558eSMark Salter * Here we define all the compile-time 'special' virtual 25bf4b558eSMark Salter * addresses. The point is to have a constant address at 26bf4b558eSMark Salter * compile time, but to set the physical address only 27bf4b558eSMark Salter * in the boot process. 28bf4b558eSMark Salter * 29bf4b558eSMark Salter * These 'compile-time allocated' memory buffers are 30bf4b558eSMark Salter * page-sized. Use set_fixmap(idx,phys) to associate 31bf4b558eSMark Salter * physical memory with fixmap indices. 32bf4b558eSMark Salter * 33bf4b558eSMark Salter */ 34bf4b558eSMark Salter enum fixed_addresses { 35dab78b6dSLaura Abbott FIX_HOLE, 3661bd93ceSArd Biesheuvel 3761bd93ceSArd Biesheuvel /* 3861bd93ceSArd Biesheuvel * Reserve a virtual window for the FDT that is 2 MB larger than the 3961bd93ceSArd Biesheuvel * maximum supported size, and put it at the top of the fixmap region. 4061bd93ceSArd Biesheuvel * The additional space ensures that any FDT that does not exceed 4161bd93ceSArd Biesheuvel * MAX_FDT_SIZE can be mapped regardless of whether it crosses any 4261bd93ceSArd Biesheuvel * 2 MB alignment boundaries. 4361bd93ceSArd Biesheuvel * 4461bd93ceSArd Biesheuvel * Keep this at the top so it remains 2 MB aligned. 4561bd93ceSArd Biesheuvel */ 4661bd93ceSArd Biesheuvel #define FIX_FDT_SIZE (MAX_FDT_SIZE + SZ_2M) 4761bd93ceSArd Biesheuvel FIX_FDT_END, 4861bd93ceSArd Biesheuvel FIX_FDT = FIX_FDT_END + FIX_FDT_SIZE / PAGE_SIZE - 1, 4961bd93ceSArd Biesheuvel 50bf4b558eSMark Salter FIX_EARLYCON_MEM_BASE, 5119fc5775SMark Rutland FIX_TEXT_POKE0, 52bf4b558eSMark Salter __end_of_permanent_fixed_addresses, 53bf4b558eSMark Salter 54bf4b558eSMark Salter /* 55bf4b558eSMark Salter * Temporary boot-time mappings, used by early_ioremap(), 56bf4b558eSMark Salter * before ioremap() is functional. 57bf4b558eSMark Salter */ 58bf4b558eSMark Salter #ifdef CONFIG_ARM64_64K_PAGES 59bf4b558eSMark Salter #define NR_FIX_BTMAPS 4 60bf4b558eSMark Salter #else 61bf4b558eSMark Salter #define NR_FIX_BTMAPS 64 62bf4b558eSMark Salter #endif 63bf4b558eSMark Salter #define FIX_BTMAPS_SLOTS 7 64bf4b558eSMark Salter #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) 65bf4b558eSMark Salter 66bf4b558eSMark Salter FIX_BTMAP_END = __end_of_permanent_fixed_addresses, 67bf4b558eSMark Salter FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, 68bf4b558eSMark Salter __end_of_fixed_addresses 69bf4b558eSMark Salter }; 70bf4b558eSMark Salter 71bf4b558eSMark Salter #define FIXADDR_SIZE (__end_of_permanent_fixed_addresses << PAGE_SHIFT) 72bf4b558eSMark Salter #define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) 73bf4b558eSMark Salter 74bf4b558eSMark Salter #define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE) 75bf4b558eSMark Salter 76af86e597SLaura Abbott void __init early_fixmap_init(void); 77bf4b558eSMark Salter 78af86e597SLaura Abbott #define __early_set_fixmap __set_fixmap 79af86e597SLaura Abbott 80b2cedba0SMark Salter #define __late_set_fixmap __set_fixmap 81b2cedba0SMark Salter #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR) 82b2cedba0SMark Salter 83af86e597SLaura Abbott extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot); 84bf4b558eSMark Salter 85bf4b558eSMark Salter #include <asm-generic/fixmap.h> 86bf4b558eSMark Salter 87bf4b558eSMark Salter #endif /* !__ASSEMBLY__ */ 88bf4b558eSMark Salter #endif /* _ASM_ARM64_FIXMAP_H */ 89