mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 04:34:11 +08:00
9e5c33d7ae
This patch creates a generic implementation of early_ioremap() support based on the existing x86 implementation. early_ioremp() is useful for early boot code which needs to temporarily map I/O or memory regions before normal mapping functions such as ioremap() are available. Some architectures have optional MMU. In the no-MMU case, the remap functions simply return the passed in physical address and the unmap functions do nothing. Signed-off-by: Mark Salter <msalter@redhat.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: H. Peter Anvin <hpa@zytor.com> Cc: Borislav Petkov <borislav.petkov@amd.com> Cc: Dave Young <dyoung@redhat.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
#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_iounmap(void __iomem *addr, unsigned long size);
|
|
extern void early_memunmap(void *addr, unsigned long size);
|
|
|
|
/*
|
|
* Weak function called by early_ioremap_reset(). It does nothing, but
|
|
* architectures may provide their own version to do any needed cleanups.
|
|
*/
|
|
extern void early_ioremap_shutdown(void);
|
|
|
|
#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);
|
|
|
|
#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_ */
|