1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Copyright (C) 2019 Western Digital Corporation or its affiliates. 4*4882a593Smuzhiyun */ 5*4882a593Smuzhiyun 6*4882a593Smuzhiyun #ifndef _ASM_RISCV_FIXMAP_H 7*4882a593Smuzhiyun #define _ASM_RISCV_FIXMAP_H 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun #include <linux/kernel.h> 10*4882a593Smuzhiyun #include <linux/sizes.h> 11*4882a593Smuzhiyun #include <linux/pgtable.h> 12*4882a593Smuzhiyun #include <asm/page.h> 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun #ifdef CONFIG_MMU 15*4882a593Smuzhiyun /* 16*4882a593Smuzhiyun * Here we define all the compile-time 'special' virtual addresses. 17*4882a593Smuzhiyun * The point is to have a constant address at compile time, but to 18*4882a593Smuzhiyun * set the physical address only in the boot process. 19*4882a593Smuzhiyun * 20*4882a593Smuzhiyun * These 'compile-time allocated' memory buffers are page-sized. Use 21*4882a593Smuzhiyun * set_fixmap(idx,phys) to associate physical memory with fixmap indices. 22*4882a593Smuzhiyun */ 23*4882a593Smuzhiyun enum fixed_addresses { 24*4882a593Smuzhiyun FIX_HOLE, 25*4882a593Smuzhiyun FIX_PTE, 26*4882a593Smuzhiyun FIX_PMD, 27*4882a593Smuzhiyun FIX_TEXT_POKE1, 28*4882a593Smuzhiyun FIX_TEXT_POKE0, 29*4882a593Smuzhiyun FIX_EARLYCON_MEM_BASE, 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun __end_of_permanent_fixed_addresses, 32*4882a593Smuzhiyun /* 33*4882a593Smuzhiyun * Temporary boot-time mappings, used by early_ioremap(), 34*4882a593Smuzhiyun * before ioremap() is functional. 35*4882a593Smuzhiyun */ 36*4882a593Smuzhiyun #define NR_FIX_BTMAPS (SZ_256K / PAGE_SIZE) 37*4882a593Smuzhiyun #define FIX_BTMAPS_SLOTS 7 38*4882a593Smuzhiyun #define TOTAL_FIX_BTMAPS (NR_FIX_BTMAPS * FIX_BTMAPS_SLOTS) 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun FIX_BTMAP_END = __end_of_permanent_fixed_addresses, 41*4882a593Smuzhiyun FIX_BTMAP_BEGIN = FIX_BTMAP_END + TOTAL_FIX_BTMAPS - 1, 42*4882a593Smuzhiyun 43*4882a593Smuzhiyun __end_of_fixed_addresses 44*4882a593Smuzhiyun }; 45*4882a593Smuzhiyun 46*4882a593Smuzhiyun #define FIXMAP_PAGE_IO PAGE_KERNEL 47*4882a593Smuzhiyun 48*4882a593Smuzhiyun #define __early_set_fixmap __set_fixmap 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun #define __late_set_fixmap __set_fixmap 51*4882a593Smuzhiyun #define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR) 52*4882a593Smuzhiyun 53*4882a593Smuzhiyun extern void __set_fixmap(enum fixed_addresses idx, 54*4882a593Smuzhiyun phys_addr_t phys, pgprot_t prot); 55*4882a593Smuzhiyun 56*4882a593Smuzhiyun #include <asm-generic/fixmap.h> 57*4882a593Smuzhiyun 58*4882a593Smuzhiyun #endif /* CONFIG_MMU */ 59*4882a593Smuzhiyun #endif /* _ASM_RISCV_FIXMAP_H */ 60