39 lines
1.3 KiB
C
Executable file
39 lines
1.3 KiB
C
Executable file
/* The kernel call implemented in this file:
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* m_type: SYS_UMAP
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*
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* The parameters for this kernel call are:
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* m_lsys_krn_sys_umap.src_endpt (process number)
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* m_lsys_krn_sys_umap.segment (segment where address is: T, D, or S)
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* m_lsys_krn_sys_umap.src_addr (virtual address)
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* m_krn_lsys_sys_umap.dst_addr (returns physical address)
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* m_lsys_krn_sys_umap.nr_bytes (size of datastructure)
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*/
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#include "kernel/system.h"
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#include <minix/endpoint.h>
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#if USE_UMAP
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#if ! USE_UMAP_REMOTE
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#undef do_umap_remote
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#endif
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/*==========================================================================*
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* do_umap *
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*==========================================================================*/
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int do_umap(struct proc * caller, message * m_ptr)
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{
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int seg_index = m_ptr->m_lsys_krn_sys_umap.segment & SEGMENT_INDEX;
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int endpt = m_ptr->m_lsys_krn_sys_umap.src_endpt;
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/* This call is a subset of umap_remote, it allows mapping virtual addresses
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* in the caller's address space and grants where the caller is specified as
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* grantee; after the security check we simply invoke do_umap_remote
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*/
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if (seg_index != MEM_GRANT && endpt != SELF) return EPERM;
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m_ptr->m_lsys_krn_sys_umap.dst_endpt = SELF;
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return do_umap_remote(caller, m_ptr);
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}
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#endif /* USE_UMAP */
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