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[unix-history] / usr / src / sys / vax / stand / mba.c

/*      mba.c   4.4     82/07/15        */

#include "../h/param.h"
#include "../h/inode.h"
#include "../h/pte.h"
#include "../h/mbareg.h"
#include "../h/fs.h"
#include "../h/mtpr.h"
#include "../h/vm.h"
#include "saio.h"
#include "savax.h"

mbastart(io, func)
       register struct iob *io;
       int func;
{
       struct mba_regs *mba = mbamba(io->i_unit);
       struct mba_drv *drv = mbadrv(io->i_unit);
       register struct pte *pte = mba->mba_map;
       int npf;
       unsigned v;
       int o;
       int vaddr;

       v = btop(io->i_ma);
       o = (int)io->i_ma & PGOFSET;
       npf = btoc(io->i_cc + o);
       vaddr = o;
       while (--npf >= 0)
               *(int *)pte++ = v++ | PG_V;
       mba->mba_sr = -1;
       mba->mba_bcr = -io->i_cc;
       mba->mba_var = vaddr;
       if (func == WRITE)
               drv->mbd_cs1 = MB_WCOM | MB_GO;
       else
               drv->mbd_cs1 = MB_RCOM | MB_GO;
}

mbainit(mbanum)
       int mbanum;
{
       register struct mba_regs *mba = mbaddr[mbanum];

       /* SHOULD BADADDR IT */
       if (mbaact & (1<<mbanum))
               return;
       mba->mba_cr = MBCR_INIT;
       mbaact |= 1<<mbanum;
}