source: rtems/c/src/lib/libbsp/powerpc/shared/residual/residual.c @ 116633f

/*
 * residual.c : function used to parse residual data.
 *
 *  CopyRight (C) 1999 valette@crf.canon.fr
 *
 *  This code is heavilly inspired by the public specification of STREAM V2
 *  that can be found at :
 *
 *  The license and distribution terms for this file may be
 *  found in found in the file LICENSE in this distribution or at
 *  http://www.rtems.com/license/LICENSE.
 *
 *  $Id$
 */

#include <string.h>

#include <bsp/residual.h>
#include <libcpu/io.h>
#include <libcpu/byteorder.h>


static int same_DevID(unsigned short vendor,
               unsigned short Number,
               char * str) 
{
        static unsigned const char hexdigit[]="0123456789ABCDEF";
        if (strlen(str)!=7) return 0;
        if ( ( ((vendor>>10)&0x1f)+'A'-1 == str[0])  &&
             ( ((vendor>>5)&0x1f)+'A'-1 == str[1])   &&
             ( (vendor&0x1f)+'A'-1 == str[2])        &&
             (hexdigit[(Number>>12)&0x0f] == str[3]) &&
             (hexdigit[(Number>>8)&0x0f] == str[4])  &&
             (hexdigit[(Number>>4)&0x0f] == str[5])  &&
             (hexdigit[Number&0x0f] == str[6]) ) return 1;
        return 0;
}

PPC_DEVICE *residual_find_device(RESIDUAL *res,unsigned long BusMask,
                                 unsigned char * DevID,
                                 int BaseType,
                                 int SubType,
                                 int Interface,
                                 int n)
{
        int i;
        if ( !res || !res->ResidualLength ) return NULL;
        for (i=0; i<res->ActualNumDevices; i++) {
#define Dev res->Devices[i].DeviceId
                if ( (Dev.BusId&BusMask)                                  &&
                     (BaseType==-1 || Dev.BaseType==BaseType)             &&
                     (SubType==-1 || Dev.SubType==SubType)                &&
                     (Interface==-1 || Dev.Interface==Interface)          &&
                     (DevID==NULL || same_DevID((Dev.DevId>>16)&0xffff,
                                                Dev.DevId&0xffff, DevID)) &&
                     !(n--) ) return res->Devices+i;
#undef Dev
        }
        return 0;
}

PnP_TAG_PACKET *PnP_find_packet(unsigned char *p,
                                unsigned packet_tag,
                                int n)
{
        unsigned mask, masked_tag, size;
        if(!p) return 0;
        if (tag_type(packet_tag)) mask=0xff; else mask=0xF8;
        masked_tag = packet_tag&mask;
        for(; *p != END_TAG; p+=size) {
                if ((*p & mask) == masked_tag && !(n--)) 
                        return (PnP_TAG_PACKET *) p;
                if (tag_type(*p))
                        size=ld_le16((unsigned short *)(p+1))+3;
                else 
                        size=tag_small_count(*p)+1;
        }
        return 0; /* not found */
}

PnP_TAG_PACKET *PnP_find_small_vendor_packet(unsigned char *p,
                                             unsigned packet_type,
                                             int n)
{
        int next=0;
        while (p) {
                p = (unsigned char *) PnP_find_packet(p, 0x70, next);
                if (p && p[1]==packet_type && !(n--)) 
                        return (PnP_TAG_PACKET *) p;
                next = 1;
        };
        return 0; /* not found */
}

PnP_TAG_PACKET *PnP_find_large_vendor_packet(unsigned char *p,
                                           unsigned packet_type,
                                           int n)
{
        int next=0;
        while (p) {
                p = (unsigned char *) PnP_find_packet(p, 0x84, next);
                if (p && p[3]==packet_type && !(n--)) 
                        return (PnP_TAG_PACKET *) p;
                next = 1;
        };
        return 0; /* not found */
}