/* SPDX-License-Identifier: GPL-2.0 */ /* * fixmap.h: compile-time virtual memory allocation * * Copyright (C) 1998 Ingo Molnar * * Copyright 2008 Freescale Semiconductor Inc. * Port to powerpc added by Kumar Gala * * Copyright 2011 Michal Simek <monstr@monstr.eu> * Copyright 2011 PetaLogix Qld Pty Ltd * Port to Microblaze */ #ifndef _ASM_FIXMAP_H #define _ASM_FIXMAP_H #ifndef __ASSEMBLY__ #include <linux/kernel.h> #include <asm/page.h> #ifdef CONFIG_HIGHMEM #include <linux/threads.h> #include <asm/kmap_types.h> #endif #define FIXADDR_TOP ((unsigned long)(-PAGE_SIZE)) /* * Here we define all the compile-time 'special' virtual * addresses. The point is to have a constant address at * compile time, but to set the physical address only * in the boot process. We allocate these special addresses * from the end of virtual memory (0xfffff000) backwards. * Also this lets us do fail-safe vmalloc(), we * can guarantee that these special addresses and * vmalloc()-ed addresses never overlap. * * these 'compile-time allocated' memory buffers are * fixed-size 4k pages. (or larger if used with an increment * highger than 1) use fixmap_set(idx,phys) to associate * physical memory with fixmap indices. * * TLB entries of such buffers will not be flushed across * task switches. */ enum fixed_addresses { FIX_HOLE, #ifdef CONFIG_HIGHMEM FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */ FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * num_possible_cpus()) - 1, #endif __end_of_fixed_addresses }; extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags); #define __FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) #define FIXADDR_START (FIXADDR_TOP - __FIXADDR_SIZE) #define FIXMAP_PAGE_NOCACHE PAGE_KERNEL_CI #include <asm-generic/fixmap.h> #endif /* !__ASSEMBLY__ */ #endif