38 lines
1.1 KiB
C
38 lines
1.1 KiB
C
/* The system call implemented in this file:
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* m_type: SYS_PHYSCOPY
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*
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* The parameters for this system call are:
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* m5_l1: CP_SRC_ADDR (physical source address)
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* m5_l2: CP_DST_ADDR (physical destination address)
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* m5_l3: CP_NR_BYTES (number of bytes to copy)
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*
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* Author:
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* Jorrit N. Herder <jnherder@cs.vu.nl>
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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_physcopy *
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*===========================================================================*/
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PUBLIC int do_physcopy(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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/* Handle sys_physcopy(). Copy data by using physical addressing. */
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phys_bytes src_phys, dst_phys, bytes;
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/* Dismember the command message. */
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src_phys = (phys_bytes) m_ptr->CP_SRC_ADDR;
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dst_phys = (phys_bytes) m_ptr->CP_DST_ADDR;
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bytes = (phys_bytes) m_ptr->CP_NR_BYTES;
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/* Do some checks and copy the data. */
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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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