| 1 | /* The kernel call implemented in this file:
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| 2 | * m_type: SYS_UMAP
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| 3 | *
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| 4 | * The parameters for this kernel call are:
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| 5 | * m5_i1: CP_SRC_PROC_NR (process number)
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| 6 | * m5_c1: CP_SRC_SPACE (segment where address is: T, D, or S)
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| 7 | * m5_l1: CP_SRC_ADDR (virtual address)
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| 8 | * m5_l2: CP_DST_ADDR (returns physical address)
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| 9 | * m5_l3: CP_NR_BYTES (size of datastructure)
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| 10 | */
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| 11 |
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| 12 | #include "../system.h"
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| 13 |
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| 14 | #if USE_UMAP
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| 15 |
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| 16 | /*==========================================================================*
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| 17 | * do_umap *
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| 18 | *==========================================================================*/
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| 19 | PUBLIC int do_umap(m_ptr)
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| 20 | register message *m_ptr; /* pointer to request message */
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| 21 | {
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| 22 | /* Map virtual address to physical, for non-kernel processes. */
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| 23 | int seg_type = m_ptr->CP_SRC_SPACE & SEGMENT_TYPE;
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| 24 | int seg_index = m_ptr->CP_SRC_SPACE & SEGMENT_INDEX;
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| 25 | vir_bytes offset = m_ptr->CP_SRC_ADDR;
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| 26 | int count = m_ptr->CP_NR_BYTES;
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| 27 | int endpt = (int) m_ptr->CP_SRC_ENDPT;
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| 28 | int proc_nr;
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| 29 | phys_bytes phys_addr;
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| 30 |
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| 31 | /* Verify process number. */
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| 32 | if (endpt == SELF)
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| 33 | proc_nr = who_p;
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| 34 | else
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| 35 | if (! isokendpt(endpt, &proc_nr))
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| 36 | return(EINVAL);
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| 37 |
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| 38 | /* See which mapping should be made. */
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| 39 | switch(seg_type) {
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| 40 | case LOCAL_SEG:
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| 41 | phys_addr = umap_local(proc_addr(proc_nr), seg_index, offset, count);
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| 42 | break;
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| 43 | case REMOTE_SEG:
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| 44 | phys_addr = umap_remote(proc_addr(proc_nr), seg_index, offset, count);
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| 45 | break;
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| 46 | case BIOS_SEG:
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| 47 | phys_addr = umap_bios(proc_addr(proc_nr), offset, count);
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| 48 | break;
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| 49 | default:
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| 50 | return(EINVAL);
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| 51 | }
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| 52 | m_ptr->CP_DST_ADDR = phys_addr;
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| 53 | return (phys_addr == 0) ? EFAULT: OK;
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| 54 | }
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| 55 |
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| 56 | #endif /* USE_UMAP */
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