42ab148155
New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
/* The system call implemented in this file:
|
|
* m_type: SYS_UMAP
|
|
*
|
|
* The parameters for this system call are:
|
|
* m5_i1: CP_SRC_PROC_NR (process number)
|
|
* m5_c1: CP_SRC_SPACE (segment where address is: T, D, or S)
|
|
* m5_l1: CP_SRC_ADDR (virtual address)
|
|
* m5_l2: CP_DST_ADDR (returns physical address)
|
|
* m5_l3: CP_NR_BYTES (size of datastructure)
|
|
*/
|
|
|
|
#include "../system.h"
|
|
|
|
#if USE_UMAP
|
|
|
|
/*==========================================================================*
|
|
* do_umap *
|
|
*==========================================================================*/
|
|
PUBLIC int do_umap(m_ptr)
|
|
register message *m_ptr; /* pointer to request message */
|
|
{
|
|
/* Map virtual address to physical, for non-kernel processes. */
|
|
int seg_type = m_ptr->CP_SRC_SPACE & SEGMENT_TYPE;
|
|
int seg_index = m_ptr->CP_SRC_SPACE & SEGMENT_INDEX;
|
|
vir_bytes offset = m_ptr->CP_SRC_ADDR;
|
|
int count = m_ptr->CP_NR_BYTES;
|
|
int proc_nr = (int) m_ptr->CP_SRC_PROC_NR;
|
|
phys_bytes phys_addr;
|
|
|
|
/* Verify process number. */
|
|
if (proc_nr == SELF) proc_nr = m_ptr->m_source;
|
|
if (! isokprocn(proc_nr)) return(EINVAL);
|
|
|
|
/* See which mapping should be made. */
|
|
switch(seg_type) {
|
|
case LOCAL_SEG:
|
|
phys_addr = umap_local(proc_addr(proc_nr), seg_index, offset, count);
|
|
break;
|
|
case REMOTE_SEG:
|
|
phys_addr = umap_remote(proc_addr(proc_nr), seg_index, offset, count);
|
|
break;
|
|
case BIOS_SEG:
|
|
phys_addr = umap_bios(proc_addr(proc_nr), offset, count);
|
|
break;
|
|
default:
|
|
return(EINVAL);
|
|
}
|
|
m_ptr->CP_DST_ADDR = phys_addr;
|
|
return (phys_addr == 0) ? EFAULT: OK;
|
|
}
|
|
|
|
#endif /* USE_UMAP */
|