1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef _ASM_EARLY_IOREMAP_H_ 3#define _ASM_EARLY_IOREMAP_H_ 4 5#include <linux/types.h> 6 7/* 8 * early_ioremap() and early_iounmap() are for temporary early boot-time 9 * mappings, before the real ioremap() is functional. 10 */ 11extern void __iomem *early_ioremap(resource_size_t phys_addr, 12 unsigned long size); 13extern void *early_memremap(resource_size_t phys_addr, 14 unsigned long size); 15extern void *early_memremap_ro(resource_size_t phys_addr, 16 unsigned long size); 17extern void *early_memremap_prot(resource_size_t phys_addr, 18 unsigned long size, unsigned long prot_val); 19extern void early_iounmap(void __iomem *addr, unsigned long size); 20extern void early_memunmap(void *addr, unsigned long size); 21 22/* 23 * Weak function called by early_ioremap_reset(). It does nothing, but 24 * architectures may provide their own version to do any needed cleanups. 25 */ 26extern void early_ioremap_shutdown(void); 27 28#if defined(CONFIG_GENERIC_EARLY_IOREMAP) && defined(CONFIG_MMU) 29/* Arch-specific initialization */ 30extern void early_ioremap_init(void); 31 32/* Generic initialization called by architecture code */ 33extern void early_ioremap_setup(void); 34 35/* 36 * Called as last step in paging_init() so library can act 37 * accordingly for subsequent map/unmap requests. 38 */ 39extern void early_ioremap_reset(void); 40 41/* 42 * Early copy from unmapped memory to kernel mapped memory. 43 */ 44extern void copy_from_early_mem(void *dest, phys_addr_t src, 45 unsigned long size); 46 47#else 48static inline void early_ioremap_init(void) { } 49static inline void early_ioremap_setup(void) { } 50static inline void early_ioremap_reset(void) { } 51#endif 52 53#endif /* _ASM_EARLY_IOREMAP_H_ */ 54