| 1 | /* The kernel call implemented in this file:
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| 2 | * m_type: SYS_VIRVCOPY, SYS_PHYSVCOPY
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| 3 | *
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| 4 | * The parameters for this kernel call are:
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| 5 | * m1_i3: VCP_VEC_SIZE size of copy request vector
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| 6 | * m1_p1: VCP_VEC_ADDR address of vector at caller
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| 7 | * m1_i2: VCP_NR_OK number of successfull copies
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| 8 | */
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| 9 |
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| 10 | #include "../system.h"
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| 11 | #include <minix/type.h>
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| 12 |
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| 13 | #if (USE_VIRVCOPY || USE_PHYSVCOPY)
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| 14 |
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| 15 | /* Buffer to hold copy request vector from user. */
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| 16 | PRIVATE struct vir_cp_req vir_cp_req[VCOPY_VEC_SIZE];
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| 17 |
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| 18 | /*===========================================================================*
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| 19 | * do_vcopy *
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| 20 | *===========================================================================*/
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| 21 | PUBLIC int do_vcopy(m_ptr)
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| 22 | register message *m_ptr; /* pointer to request message */
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| 23 | {
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| 24 | /* Handle sys_virvcopy() and sys_physvcopy() that pass a vector with copy
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| 25 | * requests. Although a single handler function is used, there are two
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| 26 | * different kernel calls so that permissions can be checked.
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| 27 | */
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| 28 | int nr_req;
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| 29 | int caller_pid;
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| 30 | vir_bytes caller_vir;
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| 31 | phys_bytes caller_phys;
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| 32 | phys_bytes kernel_phys;
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| 33 | phys_bytes bytes;
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| 34 | int i,s;
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| 35 | struct vir_cp_req *req;
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| 36 |
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| 37 | /* Check if request vector size is ok. */
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| 38 | nr_req = (unsigned) m_ptr->VCP_VEC_SIZE;
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| 39 | if (nr_req > VCOPY_VEC_SIZE) return(EINVAL);
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| 40 | bytes = nr_req * sizeof(struct vir_cp_req);
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| 41 |
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| 42 | /* Calculate physical addresses and copy (port,value)-pairs from user. */
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| 43 | caller_pid = (int) m_ptr->m_source;
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| 44 | caller_vir = (vir_bytes) m_ptr->VCP_VEC_ADDR;
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| 45 | caller_phys = umap_local(proc_addr(caller_pid), D, caller_vir, bytes);
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| 46 | if (0 == caller_phys) return(EFAULT);
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| 47 | kernel_phys = vir2phys(vir_cp_req);
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| 48 | phys_copy(caller_phys, kernel_phys, (phys_bytes) bytes);
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| 49 |
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| 50 | /* Assume vector with requests is correct. Try to copy everything. */
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| 51 | m_ptr->VCP_NR_OK = 0;
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| 52 | for (i=0; i<nr_req; i++) {
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| 53 |
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| 54 | req = &vir_cp_req[i];
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| 55 |
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| 56 | /* Check if physical addressing is used without SYS_PHYSVCOPY. */
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| 57 | if (((req->src.segment | req->dst.segment) & PHYS_SEG) &&
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| 58 | m_ptr->m_type != SYS_PHYSVCOPY) return(EPERM);
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| 59 | if ((s=virtual_copy(&req->src, &req->dst, req->count)) != OK)
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| 60 | return(s);
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| 61 | m_ptr->VCP_NR_OK ++;
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| 62 | }
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| 63 | return(OK);
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| 64 | }
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| 65 |
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| 66 | #endif /* (USE_VIRVCOPY || USE_PHYSVCOPY) */
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| 67 |
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