44 lines
1014 B
C
44 lines
1014 B
C
/* The kernel call implemented in this file:
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* m_type: SYS_MAPDMA
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*
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* The parameters for this kernel call are:
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* m5_l1: CP_SRC_ADDR (virtual address)
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* m5_l3: CP_NR_BYTES (size of datastructure)
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*/
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#include "../system.h"
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/*==========================================================================*
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* do_mapdma *
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*==========================================================================*/
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PUBLIC int do_mapdma(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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int r;
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endpoint_t proc_e;
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int proc_p;
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vir_bytes base, size;
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phys_bytes phys_base;
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struct proc *proc;
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message m;
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proc_e = m_ptr->CP_SRC_ENDPT;
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base= m_ptr->CP_SRC_ADDR;
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size= m_ptr->CP_NR_BYTES;
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if (!isokendpt(proc_e, &proc_p))
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return(EINVAL);
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proc = proc_addr(proc_p);
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phys_base= umap_virtual(proc, D, base, size);
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if (!phys_base)
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{
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kprintf("do_mapdma: umap_virtual failed\n");
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return EFAULT;
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}
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m_ptr->CP_DST_ADDR = phys_base;
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return OK;
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}
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