3061d7b17a
from DIO_REQUEST. Also do_vdevio. Also do_sdevio, but this function also supports grant id's and offsets. do_segctl: rename protected to prot. do_umap: support for GRANT_SEG umap. do_privctl: support SYS_PRIV_SET_GRANTS, which sets location and size of in-own-address-space grant table. do_safecopy: functions to verify and perform 'safe' (grant-based) copies.
60 lines
1.7 KiB
C
60 lines
1.7 KiB
C
/* The kernel call implemented in this file:
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* m_type: SYS_UMAP
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*
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* The parameters for this kernel call are:
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* m5_i1: CP_SRC_PROC_NR (process number)
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* m5_c1: CP_SRC_SPACE (segment where address is: T, D, or S)
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* m5_l1: CP_SRC_ADDR (virtual address)
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* m5_l2: CP_DST_ADDR (returns physical address)
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* m5_l3: CP_NR_BYTES (size of datastructure)
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*/
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#include "../system.h"
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#if USE_UMAP
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/*==========================================================================*
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* do_umap *
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*==========================================================================*/
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PUBLIC int do_umap(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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/* Map virtual address to physical, for non-kernel processes. */
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int seg_type = m_ptr->CP_SRC_SPACE & SEGMENT_TYPE;
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int seg_index = m_ptr->CP_SRC_SPACE & SEGMENT_INDEX;
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vir_bytes offset = m_ptr->CP_SRC_ADDR;
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int count = m_ptr->CP_NR_BYTES;
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int endpt = (int) m_ptr->CP_SRC_ENDPT;
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int proc_nr;
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phys_bytes phys_addr;
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/* Verify process number. */
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if (endpt == SELF)
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proc_nr = who_p;
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else
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if (! isokendpt(endpt, &proc_nr))
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return(EINVAL);
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/* See which mapping should be made. */
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switch(seg_type) {
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case LOCAL_SEG:
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phys_addr = umap_local(proc_addr(proc_nr), seg_index, offset, count);
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break;
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case REMOTE_SEG:
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phys_addr = umap_remote(proc_addr(proc_nr), seg_index, offset, count);
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break;
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case BIOS_SEG:
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phys_addr = umap_bios(proc_addr(proc_nr), offset, count);
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break;
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case GRANT_SEG:
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phys_addr = umap_grant(proc_addr(proc_nr), offset, count);
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break;
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default:
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return(EINVAL);
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}
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m_ptr->CP_DST_ADDR = phys_addr;
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return (phys_addr == 0) ? EFAULT: OK;
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}
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#endif /* USE_UMAP */
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