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Annotation of cci/d/ioex/subs.c, revision 1.1

1.1     ! root        1: 
        !             2: 
        !             3: long r_no, pt_base, ctlblk;
        !             4: 
        !             5: /* This routine modify the page frame number (bit 0-21) of PTE
        !             6:    in any Page table. Input parameter :
        !             7:        reg_no     : contain a number specify one of the following :
        !             8:                     SBR,SLR,P0BR,P0LR,P1BR,P1LR,P2BR,P2LR
        !             9:        old_pte    : pointer to location to save original PTE
        !            10:                     (This could be used to read any PTE when pvbits_msk = 0)
        !            11:        which1     : PTE no; 0,1,2...X
        !            12:        pfn        : New page frame no. (bit 0 thru 19 of pfn )
        !            13: */
        !            14: fixpfn_pte(reg_no,which1,old_pte,pfn)
        !            15: long reg_no, *old_pte, which1, pfn;
        !            16: {      
        !            17:        long *st_base;
        !            18: 
        !            19:        r_no = reg_no;
        !            20: 
        !            21:        asm("mfpr _r_no,_pt_base");             /* Get base address  */
        !            22: 
        !            23:        st_base = (long *)pt_base;
        !            24:        st_base += which1;
        !            25:        *old_pte = *st_base;                    /* Save original PTE */
        !            26:        *st_base = (*st_base)&(~PTE_PFN);       /* Mask PFN off */
        !            27:        *st_base = (*st_base)|(pfn & PTE_PFN);  /* Set new PFN */
        !            28:        *st_base = (*st_base)&0xff7fffff;       /* Set PTE_M bit off */
        !            29:        asm("mtpr $0,$TBIA");           /* Invalidate translation buffers */
        !            30:        asm("mtpr $0,$PADC");           /* Purge all data cache */
        !            31: }
        !            32: 
        !            33: /* This routine saved a vector in SCB and set it to a new one
        !            34:    input parameters :
        !            35:        which1 : Vector no; 0,1,2,..X
        !            36:        saved_vec : pointer to a location to saved original vector
        !            37:        new_vec   : address of new handler
        !            38:        stack     : 'K' or 'k' : service on Kernel stack
        !            39:                    otherwise  : service on Interrupt stack
        !            40: */
        !            41: set_handler(which1,saved_vec,new_vec)
        !            42: long which1, *saved_vec, new_vec; 
        !            43: {      long *st_base;
        !            44: 
        !            45:        asm("movab _scb,_ctlblk");
        !            46:        st_base = (long *)ctlblk;       /* address of SCB is at page 2 */
        !            47:        st_base += which1;
        !            48:        *saved_vec = *st_base;          /* Save original vector */
        !            49:        *st_base = new_vec;
        !            50: }
        !            51: 

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