mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 03:46:42 +07:00
55 lines
1.0 KiB
C
55 lines
1.0 KiB
C
/*
|
|
* include/asm-s390/io.h
|
|
*
|
|
* S390 version
|
|
* Copyright (C) 1999 IBM Deutschland Entwicklung GmbH, IBM Corporation
|
|
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
|
|
*
|
|
* Derived from "include/asm-i386/io.h"
|
|
*/
|
|
|
|
#ifndef _S390_IO_H
|
|
#define _S390_IO_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <asm/page.h>
|
|
|
|
#define IO_SPACE_LIMIT 0xffffffff
|
|
|
|
/*
|
|
* Change virtual addresses to physical addresses and vv.
|
|
* These are pretty trivial
|
|
*/
|
|
static inline unsigned long virt_to_phys(volatile void * address)
|
|
{
|
|
unsigned long real_address;
|
|
asm volatile(
|
|
" lra %0,0(%1)\n"
|
|
" jz 0f\n"
|
|
" la %0,0\n"
|
|
"0:"
|
|
: "=a" (real_address) : "a" (address) : "cc");
|
|
return real_address;
|
|
}
|
|
|
|
static inline void * phys_to_virt(unsigned long address)
|
|
{
|
|
return (void *) address;
|
|
}
|
|
|
|
/*
|
|
* Convert a physical pointer to a virtual kernel pointer for /dev/mem
|
|
* access
|
|
*/
|
|
#define xlate_dev_mem_ptr(p) __va(p)
|
|
|
|
/*
|
|
* Convert a virtual cached pointer to an uncached pointer
|
|
*/
|
|
#define xlate_dev_kmem_ptr(p) p
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif
|