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Diffstat (limited to 'include/asm-generic/early_ioremap.h')
| -rw-r--r-- | include/asm-generic/early_ioremap.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/include/asm-generic/early_ioremap.h b/include/asm-generic/early_ioremap.h new file mode 100644 index 000000000..9d0479f50 --- /dev/null +++ b/include/asm-generic/early_ioremap.h @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_EARLY_IOREMAP_H_ +#define _ASM_EARLY_IOREMAP_H_ + +#include <linux/types.h> + +/* + * early_ioremap() and early_iounmap() are for temporary early boot-time + * mappings, before the real ioremap() is functional. + */ +extern void __iomem *early_ioremap(resource_size_t phys_addr, + unsigned long size); +extern void *early_memremap(resource_size_t phys_addr, + unsigned long size); +extern void *early_memremap_ro(resource_size_t phys_addr, + unsigned long size); +extern void *early_memremap_prot(resource_size_t phys_addr, + unsigned long size, unsigned long prot_val); +extern void early_iounmap(void __iomem *addr, unsigned long size); +extern void early_memunmap(void *addr, unsigned long size); + +#if defined(CONFIG_GENERIC_EARLY_IOREMAP) && defined(CONFIG_MMU) +/* Arch-specific initialization */ +extern void early_ioremap_init(void); + +/* Generic initialization called by architecture code */ +extern void early_ioremap_setup(void); + +/* + * Called as last step in paging_init() so library can act + * accordingly for subsequent map/unmap requests. + */ +extern void early_ioremap_reset(void); + +/* + * Early copy from unmapped memory to kernel mapped memory. + */ +extern void copy_from_early_mem(void *dest, phys_addr_t src, + unsigned long size); + +#else +static inline void early_ioremap_init(void) { } +static inline void early_ioremap_setup(void) { } +static inline void early_ioremap_reset(void) { } +#endif + +#endif /* _ASM_EARLY_IOREMAP_H_ */ |