67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
/* The system call implemented in this file:
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* m_type: SYS_VIRVCOPY, SYS_PHYSVCOPY
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*
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* The parameters for this system call are:
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* m1_i3: VCP_VEC_SIZE size of copy request vector
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* m1_p1: VCP_VEC_ADDR address of vector at caller
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* m1_i2: VCP_NR_OK number of successfull copies
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*/
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#include "../system.h"
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#include <minix/type.h>
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#if (USE_VIRVCOPY || USE_PHYSVCOPY)
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/* Buffer to hold copy request vector from user. */
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PRIVATE struct vir_cp_req vir_cp_req[VCOPY_VEC_SIZE];
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/*===========================================================================*
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* do_vcopy *
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*===========================================================================*/
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PUBLIC int do_vcopy(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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/* Handle sys_virvcopy() and sys_physvcopy() that pass a vector with copy
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* requests. Although a single handler function is used, there are two
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* different system calls so that permissions can be checked.
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*/
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int nr_req;
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int caller_pid;
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vir_bytes caller_vir;
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phys_bytes caller_phys;
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phys_bytes kernel_phys;
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phys_bytes bytes;
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int i,s;
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struct vir_cp_req *req;
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/* Check if request vector size is ok. */
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nr_req = (unsigned) m_ptr->VCP_VEC_SIZE;
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if (nr_req > VCOPY_VEC_SIZE) return(EINVAL);
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bytes = nr_req * sizeof(struct vir_cp_req);
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/* Calculate physical addresses and copy (port,value)-pairs from user. */
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caller_pid = (int) m_ptr->m_source;
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caller_vir = (vir_bytes) m_ptr->VCP_VEC_ADDR;
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caller_phys = umap_local(proc_addr(caller_pid), D, caller_vir, bytes);
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if (0 == caller_phys) return(EFAULT);
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kernel_phys = vir2phys(vir_cp_req);
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phys_copy(caller_phys, kernel_phys, (phys_bytes) bytes);
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/* Assume vector with requests is correct. Try to copy everything. */
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m_ptr->VCP_NR_OK = 0;
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for (i=0; i<nr_req; i++) {
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req = &vir_cp_req[i];
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/* Check if physical addressing is used without SYS_PHYSVCOPY. */
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if (((req->src.segment | req->dst.segment) & PHYS_SEG) &&
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m_ptr->m_type != SYS_PHYSVCOPY) return(EPERM);
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if ((s=virtual_copy(&req->src, &req->dst, req->count)) != OK)
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return(s);
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m_ptr->VCP_NR_OK ++;
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}
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return(OK);
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}
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#endif /* (USE_VIRVCOPY || USE_PHYSVCOPY) */
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