45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/* The system call implemented in this file:
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* m_type: SYS_GETMAP
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*
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* The parameters for this system call are:
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* m1_i1: PR_PROC_NR (process to get map of)
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* m1_p1: PR_MEM_PTR (copy the memory map here)
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*/
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#include "../kernel.h"
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#include "../system.h"
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INIT_ASSERT
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/*===========================================================================*
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* do_getmap *
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*===========================================================================*/
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PUBLIC int do_getmap(m_ptr)
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message *m_ptr; /* pointer to request message */
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{
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/* Handle sys_getmap(). Report the memory map to MM. */
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register struct proc *rp;
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phys_bytes dst_phys;
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int caller; /* where the map has to be stored */
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int k; /* process whose map is to be loaded */
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struct mem_map *map_ptr; /* virtual address of map inside caller (MM) */
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/* Extract message parameters and copy new memory map to MM. */
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caller = m_ptr->m_source;
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k = m_ptr->PR_PROC_NR;
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map_ptr = (struct mem_map *) m_ptr->PR_MEM_PTR;
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assert(isokprocn(k)); /* unlikely: MM sends a bad proc nr. */
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rp = proc_addr(k); /* ptr to entry of the map */
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/* Copy the map to MM. */
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dst_phys = umap_local(proc_addr(caller), D, (vir_bytes) map_ptr, sizeof(rp->p_map));
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assert(dst_phys != 0);
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phys_copy(vir2phys(rp->p_map), dst_phys, sizeof(rp->p_map));
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return(OK);
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}
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