39 lines
1.1 KiB
C
39 lines
1.1 KiB
C
/* The kernel call implemented in this file:
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* m_type: SYS_READBIOS
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*
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* The parameters for this kernel call are:
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* m2_i1: RDB_SIZE number of bytes to copy
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* m2_l1: RDB_ADDR absolute address in BIOS area
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* m2_p1: RDB_BUF buffer address in requesting process
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*/
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#include "../system.h"
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#include <minix/type.h>
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/*===========================================================================*
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* do_readbios *
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*===========================================================================*/
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PUBLIC int do_readbios(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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int proc_nr;
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struct proc *p;
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phys_bytes address, phys_buf, phys_bios;
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vir_bytes buf;
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size_t size;
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address = m_ptr->RDB_ADDR;
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buf = (vir_bytes)m_ptr->RDB_BUF;
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size = m_ptr->RDB_SIZE;
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okendpt(m_ptr->m_source, &proc_nr);
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p = proc_addr(proc_nr);
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phys_buf = umap_local(p, D, buf, size);
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if (phys_buf == 0)
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return EFAULT;
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phys_bios = umap_bios(p, address, size);
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if (phys_bios == 0)
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return EPERM;
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phys_copy(phys_bios, phys_buf, size);
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return 0;
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}
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