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/* The kernel call implemented in this file:
* m_type: SYS_VIRCOPY, SYS_PHYSCOPY
*
* The parameters for this kernel call are:
* m_lsys_krn_sys_copy.src_addr source offset within segment
* m_lsys_krn_sys_copy.src_endpt source process number
* m_lsys_krn_sys_copy.dst_addr destination offset within segment
* m_lsys_krn_sys_copy.dst_endpt destination process number
* m_lsys_krn_sys_copy.nr_bytes number of bytes to copy
* m_lsys_krn_sys_copy.flags
*/
#include "kernel/system.h"
#include "kernel/vm.h"
#include <assert.h>
#if (USE_VIRCOPY || USE_PHYSCOPY)
/*===========================================================================*
* do_copy *
*===========================================================================*/
int do_copy(struct proc * caller, message * m_ptr)
{
/* Handle sys_vircopy() and sys_physcopy(). Copy data using virtual or
* physical addressing. Although a single handler function is used, there
* are two different kernel calls so that permissions can be checked.
*/
struct vir_addr vir_addr[2]; /* virtual source and destination address */
phys_bytes bytes; /* number of bytes to copy */
int i;
#if 0
if (caller->p_endpoint != PM_PROC_NR && caller->p_endpoint != VFS_PROC_NR &&
caller->p_endpoint != RS_PROC_NR && caller->p_endpoint != MEM_PROC_NR &&
caller->p_endpoint != VM_PROC_NR)
{
static int first=1;
if (first)
{
first= 0;
printf(
"do_copy: got request from %d (source %d, destination %d)\n",
caller->p_endpoint,
m_ptr->m_lsys_krn_sys_copy.src_endpt,
m_ptr->m_lsys_krn_sys_copy.dst_endpt);
}
}
#endif
/* Dismember the command message. */
vir_addr[_SRC_].proc_nr_e = m_ptr->m_lsys_krn_sys_copy.src_endpt;
vir_addr[_DST_].proc_nr_e = m_ptr->m_lsys_krn_sys_copy.dst_endpt;
vir_addr[_SRC_].offset = m_ptr->m_lsys_krn_sys_copy.src_addr;
vir_addr[_DST_].offset = m_ptr->m_lsys_krn_sys_copy.dst_addr;
bytes = m_ptr->m_lsys_krn_sys_copy.nr_bytes;
/* Now do some checks for both the source and destination virtual address.
* This is done once for _SRC_, then once for _DST_.
*/
for (i=_SRC_; i<=_DST_; i++) {
int p;
/* Check if process number was given implicitly with SELF and is valid. */
if (vir_addr[i].proc_nr_e == SELF)
vir_addr[i].proc_nr_e = caller->p_endpoint;
if (vir_addr[i].proc_nr_e != NONE) {
if(! isokendpt(vir_addr[i].proc_nr_e, &p)) {
printf("do_copy: %d: %d not ok endpoint\n", i, vir_addr[i].proc_nr_e);
return(EINVAL);
}
}
}
/* Check for overflow. This would happen for 64K segments and 16-bit
* vir_bytes. Especially copying by the PM on do_fork() is affected.
*/
if (bytes != (phys_bytes) (vir_bytes) bytes) return(E2BIG);
/* Now try to make the actual virtual copy. */
if(m_ptr->m_lsys_krn_sys_copy.flags & CP_FLAG_TRY) {
int r;
assert(caller->p_endpoint == VFS_PROC_NR);
r = virtual_copy(&vir_addr[_SRC_], &vir_addr[_DST_], bytes);
if(r == EFAULT_SRC || r == EFAULT_DST) return r = EFAULT;
return r;
} else {
return( virtual_copy_vmcheck(caller, &vir_addr[_SRC_],
&vir_addr[_DST_], bytes) );
}
}
#endif /* (USE_VIRCOPY || USE_PHYSCOPY) */
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