minix/kernel/system/do_umap.c
Ben Gras 0fb2f83da9 drop from segments physcopy/vircopy invocations
. sys_vircopy always uses D for both src and dst
	. sys_physcopy uses PHYS_SEG if and only if corresponding
	  endpoint is NONE, so we can derive the mode (PHYS_SEG or D)
	  from the endpoint arg in the kernel, dropping the seg args
	. fields in msg still filled in for backwards compatability,
	  using same NONE-logic in the library
2012-06-18 12:28:40 +00:00

39 lines
1.2 KiB
C
Executable file

/* The kernel call implemented in this file:
* m_type: SYS_UMAP
*
* The parameters for this kernel call are:
* m5_i1: CP_SRC_PROC_NR (process number)
* m5_s1: UMAP_SEG (segment where address is: T, D, or S)
* m5_l1: CP_SRC_ADDR (virtual address)
* m5_l2: CP_DST_ADDR (returns physical address)
* m5_l3: CP_NR_BYTES (size of datastructure)
*/
#include "kernel/system.h"
#include <minix/endpoint.h>
#if USE_UMAP
#if ! USE_UMAP_REMOTE
#undef do_umap_remote
#endif
/*==========================================================================*
* do_umap *
*==========================================================================*/
int do_umap(struct proc * caller, message * m_ptr)
{
int seg_index = m_ptr->UMAP_SEG & SEGMENT_INDEX;
int endpt = (int) m_ptr->CP_SRC_ENDPT;
/* This call is a subset of umap_remote, it allows mapping virtual addresses
* in the caller's address space and grants where the caller is specified as
* grantee; after the security check we simply invoke do_umap_remote
*/
if (seg_index != MEM_GRANT && endpt != SELF) return EPERM;
m_ptr->CP_DST_ENDPT = SELF;
return do_umap_remote(caller, m_ptr);
}
#endif /* USE_UMAP */