mirror of https://gitee.com/openkylin/linux.git
42 lines
1006 B
C
42 lines
1006 B
C
/*
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* devops.c: Device operations using the PROM.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <asm/openprom.h>
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#include <asm/oplib.h>
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/* Open the device described by the string 'dstr'. Returns the handle
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* to that device used for subsequent operations on that device.
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* Returns 0 on failure.
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*/
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int
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prom_devopen(const char *dstr)
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{
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return p1275_cmd ("open", P1275_ARG(0,P1275_ARG_IN_STRING)|
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P1275_INOUT(1,1),
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dstr);
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}
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/* Close the device described by device handle 'dhandle'. */
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int
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prom_devclose(int dhandle)
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{
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p1275_cmd ("close", P1275_INOUT(1,0), dhandle);
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return 0;
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}
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/* Seek to specified location described by 'seekhi' and 'seeklo'
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* for device 'dhandle'.
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*/
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void
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prom_seek(int dhandle, unsigned int seekhi, unsigned int seeklo)
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{
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p1275_cmd ("seek", P1275_INOUT(3,1), dhandle, seekhi, seeklo);
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}
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