minix/kernel/system/do_readbios.c
2006-07-10 12:27:26 +00:00

39 lines
1.1 KiB
C

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