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0490d6d7ba
Implement the set_direct_map_*() API, which allows to invalidate and set default permissions to pages within the direct mapping. Note that kernel_page_present(), which is also supposed to be part of this API, is intentionally not implemented. The reason for this is that kernel_page_present() is only used (and currently only makes sense) for suspend/resume, which isn't supported on s390. Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASMS390_SET_MEMORY_H
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#define _ASMS390_SET_MEMORY_H
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#include <linux/mutex.h>
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extern struct mutex cpa_mutex;
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enum {
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_SET_MEMORY_RO_BIT,
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_SET_MEMORY_RW_BIT,
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_SET_MEMORY_NX_BIT,
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_SET_MEMORY_X_BIT,
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_SET_MEMORY_4K_BIT,
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_SET_MEMORY_INV_BIT,
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_SET_MEMORY_DEF_BIT,
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};
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#define SET_MEMORY_RO BIT(_SET_MEMORY_RO_BIT)
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#define SET_MEMORY_RW BIT(_SET_MEMORY_RW_BIT)
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#define SET_MEMORY_NX BIT(_SET_MEMORY_NX_BIT)
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#define SET_MEMORY_X BIT(_SET_MEMORY_X_BIT)
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#define SET_MEMORY_4K BIT(_SET_MEMORY_4K_BIT)
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#define SET_MEMORY_INV BIT(_SET_MEMORY_INV_BIT)
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#define SET_MEMORY_DEF BIT(_SET_MEMORY_DEF_BIT)
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int __set_memory(unsigned long addr, int numpages, unsigned long flags);
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static inline int set_memory_ro(unsigned long addr, int numpages)
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{
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return __set_memory(addr, numpages, SET_MEMORY_RO);
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}
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static inline int set_memory_rw(unsigned long addr, int numpages)
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{
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return __set_memory(addr, numpages, SET_MEMORY_RW);
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}
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static inline int set_memory_nx(unsigned long addr, int numpages)
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{
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return __set_memory(addr, numpages, SET_MEMORY_NX);
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}
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static inline int set_memory_x(unsigned long addr, int numpages)
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{
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return __set_memory(addr, numpages, SET_MEMORY_X);
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}
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#define set_memory_rox set_memory_rox
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static inline int set_memory_rox(unsigned long addr, int numpages)
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{
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return __set_memory(addr, numpages, SET_MEMORY_RO | SET_MEMORY_X);
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}
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static inline int set_memory_rwnx(unsigned long addr, int numpages)
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{
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return __set_memory(addr, numpages, SET_MEMORY_RW | SET_MEMORY_NX);
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}
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static inline int set_memory_4k(unsigned long addr, int numpages)
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{
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return __set_memory(addr, numpages, SET_MEMORY_4K);
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}
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int set_direct_map_invalid_noflush(struct page *page);
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int set_direct_map_default_noflush(struct page *page);
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#endif
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