minix/kernel/system/do_vcopy.c

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2005-04-21 16:53:53 +02:00
/* The system call implemented in this file:
* m_type: SYS_VCOPY
*
* The parameters for this system call are:
* m1_i1: VCP_SRC_PROC (source process number)
* m1_i2: VCP_DST_PROC (destination process number)
* m1_i3: VCP_VEC_SIZE (vector size)
* m1_p1: VCP_VEC_ADDR (pointer to vector)
*
* Author:
* Jorrit N. Herder <jnherder@cs.vu.nl>
*/
#include "../kernel.h"
#include "../system.h"
/*===========================================================================*
* do_vcopy *
*===========================================================================*/
PUBLIC int do_vcopy(m_ptr)
register message *m_ptr; /* pointer to request message */
{
/* Handle sys_vcopy(). Copy multiple blocks of memory */
int src_proc, dst_proc, vect_s, i;
vir_bytes src_vir, dst_vir, vect_addr;
phys_bytes src_phys, dst_phys, bytes;
cpvec_t cpvec_table[CPVEC_NR];
/* Dismember the command message. */
src_proc = m_ptr->VCP_SRC_PROC;
dst_proc = m_ptr->VCP_DST_PROC;
vect_s = m_ptr->VCP_VEC_SIZE;
vect_addr = (vir_bytes)m_ptr->VCP_VEC_ADDR;
if (vect_s > CPVEC_NR) return EDOM;
src_phys= numap_local(m_ptr->m_source, vect_addr, vect_s * sizeof(cpvec_t));
if (!src_phys) return EFAULT;
phys_copy(src_phys, vir2phys(cpvec_table),
(phys_bytes) (vect_s * sizeof(cpvec_t)));
for (i = 0; i < vect_s; i++) {
src_vir= cpvec_table[i].cpv_src;
dst_vir= cpvec_table[i].cpv_dst;
bytes= cpvec_table[i].cpv_size;
src_phys = numap_local(src_proc,src_vir,(vir_bytes)bytes);
dst_phys = numap_local(dst_proc,dst_vir,(vir_bytes)bytes);
if (src_phys == 0 || dst_phys == 0) return(EFAULT);
phys_copy(src_phys, dst_phys, bytes);
}
return(OK);
}