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https://github.com/drasko/codezero.git
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a82cdd3456
Added routines that check whether a user pointer is accessible by the kernel, and if not ask the pager to map-in those pages. I haven't implemented yet the bit that asks the pager for paging-in.
24 lines
744 B
C
24 lines
744 B
C
/*
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* Generic address space related information.
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*
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* Copyright (C) 2007 Bahadir Balban
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*/
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#ifndef __SPACE_H__
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#define __SPACE_H__
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/* The flags not embedded in the name behave as expected. E.g USR_RW is also */
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#define MAP_USR_RW_FLAGS 0 /* CB as one would expect */
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#define MAP_USR_RO_FLAGS 1 /* CB as one would expect */
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#define MAP_SVC_RW_FLAGS 2 /* CB as one would expect */
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#define MAP_USR_IO_FLAGS 3 /* Non-CB, RW */
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#define MAP_SVC_IO_FLAGS 4 /* Non-CB, RW */
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/* Some default aliases */
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#define MAP_USR_DEFAULT_FLAGS MAP_USR_RW_FLAGS
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#define MAP_SVC_DEFAULT_FLAGS MAP_SVC_RW_FLAGS
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#define MAP_IO_DEFAULT_FLAGS MAP_SVC_IO_FLAGS
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int check_access(unsigned long vaddr, unsigned long size, unsigned int flags);
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#endif /* __SPACE_H__ */
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