70 lines
2 KiB
C
70 lines
2 KiB
C
/* The system call implemented in this file:
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* m_type: SYS_COPY
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*
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* The parameters for this system call are:
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* m5_c1: CP_SRC_SPACE
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* m5_i1: CP_SRC_PROC_NR
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* m5_l1: CP_SRC_ADDR
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* m5_c2: CP_DST_SPACE
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* m5_i2: CP_DST_PROC_NR
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* m5_l2: CP_DST_ADDR
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* m5_l3: CP_NR_BYTES
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*/
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#include "../kernel.h"
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#include "../system.h"
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/*===========================================================================*
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* do_copy *
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*===========================================================================*/
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PUBLIC int do_copy(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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/* Handle sys_copy(). Copy data by using virtual or physical addressing. */
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int src_proc, dst_proc, src_space, dst_space;
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vir_bytes src_vir, dst_vir;
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phys_bytes src_phys, dst_phys, bytes;
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/* Dismember the command message. */
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src_proc = m_ptr->CP_SRC_PROC_NR;
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dst_proc = m_ptr->CP_DST_PROC_NR;
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src_space = m_ptr->CP_SRC_SPACE;
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dst_space = m_ptr->CP_DST_SPACE;
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src_vir = (vir_bytes) m_ptr->CP_SRC_ADDR;
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dst_vir = (vir_bytes) m_ptr->CP_DST_ADDR;
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bytes = (phys_bytes) m_ptr->CP_NR_BYTES;
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/* Check if process number was given implicitly with SELF. */
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if (src_proc == SELF) src_proc = m_ptr->m_source;
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if (dst_proc == SELF) dst_proc = m_ptr->m_source;
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/* Compute the source and destination addresses and do the copy. */
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if (src_proc == ABS) {
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src_phys = (phys_bytes) m_ptr->CP_SRC_ADDR;
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} else {
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if (bytes != (vir_bytes) bytes) {
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/* This would happen for 64K segments and 16-bit vir_bytes.
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* It would happen a lot for do_fork except MM uses ABS
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* copies for that case.
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*/
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panic("overflow in count in do_copy", NO_NUM);
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}
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src_phys = umap_local(proc_addr(src_proc), src_space, src_vir,
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(vir_bytes) bytes);
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}
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if (dst_proc == ABS) {
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dst_phys = (phys_bytes) m_ptr->CP_DST_ADDR;
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} else {
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dst_phys = umap_local(proc_addr(dst_proc), dst_space, dst_vir,
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(vir_bytes) bytes);
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}
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if (src_phys == 0 || dst_phys == 0) return(EFAULT);
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phys_copy(src_phys, dst_phys, bytes);
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return(OK);
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}
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