52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
/* The system call implemented in this file:
|
|
* m_type: SYS_NEWMAP
|
|
*
|
|
* The parameters for this system call are:
|
|
* m1_i1: PR_PROC_NR (install new map for this process)
|
|
* m1_p1: PR_MEM_PTR (pointer to memory map)
|
|
*/
|
|
|
|
#include "../kernel.h"
|
|
#include "../system.h"
|
|
INIT_ASSERT
|
|
|
|
/*===========================================================================*
|
|
* do_newmap *
|
|
*===========================================================================*/
|
|
PUBLIC int do_newmap(m_ptr)
|
|
message *m_ptr; /* pointer to request message */
|
|
{
|
|
/* Handle sys_newmap(). Fetch the memory map from MM. */
|
|
|
|
register struct proc *rp;
|
|
phys_bytes src_phys;
|
|
int caller; /* whose space has the new map (usually MM) */
|
|
int k; /* process whose map is to be loaded */
|
|
int old_flags; /* value of flags before modification */
|
|
struct mem_map *map_ptr; /* virtual address of map inside caller (MM) */
|
|
|
|
/* Extract message parameters and copy new memory map from MM. */
|
|
caller = m_ptr->m_source;
|
|
k = m_ptr->PR_PROC_NR;
|
|
map_ptr = (struct mem_map *) m_ptr->PR_MEM_PTR;
|
|
if (!isokprocn(k)) return(EINVAL);
|
|
rp = proc_addr(k); /* ptr to entry of user getting new map */
|
|
|
|
/* Copy the map from MM. */
|
|
src_phys = umap_local(proc_addr(caller), D, (vir_bytes) map_ptr, sizeof(rp->p_map));
|
|
assert(src_phys != 0);
|
|
phys_copy(src_phys, vir2phys(rp->p_map), (phys_bytes) sizeof(rp->p_map));
|
|
|
|
#if (CHIP != M68000)
|
|
alloc_segments(rp);
|
|
#else
|
|
pmmu_init_proc(rp);
|
|
#endif
|
|
old_flags = rp->p_flags; /* save the previous value of the flags */
|
|
rp->p_flags &= ~NO_MAP;
|
|
if (old_flags != 0 && rp->p_flags == 0) lock_ready(rp);
|
|
|
|
return(OK);
|
|
}
|
|
|
|
|