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