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Annotation of cci/d/event/visnv_evt.s, revision 1.1.1.1

1.1       root        1:  #
                      2:  #     interrupt stack not valid event test
                      3:  #
                      4:  #     WARNING-- This test, if works, halts the machine with
                      5:  #     r0 = 0xcafebabe, & r1 = -1.
                      6:  #
                      7:  #     R0 = error code
                      8:  #          1 - Expected interrupt stack not valid exception did not happen
                      9:  #              R1 = current PSL ,  R2 = Current ISP
                     10:  #          2 - Took software interrupt #3 while ISP is invalid
                     11:  #              R1 = current ISP
                     12:  #
                     13:        .set   SIVEC3,0x1c      /* Offset into SCB for soft int level 3 */
                     14:  #
                     15:        .globl  _isnv_evt
                     16: _isnv_evt:
                     17:        .word   0x1fff
                     18: 
                     19:        mtpr    $0x1f,$IPL
                     20:        movpsl  r1
                     21:        andl2   $0x051f0000,r1
                     22:        cmpl    $0x041f0000,r1          /* PSL : IS must be ON, K mode, */
                     23:                                        /* IPL must be 0x1f for this    */
                     24:                                        /* test to work                 */
                     25:        beql    1f
                     26:        movl    $1,r0
                     27:        movl    $0x041f0000,r2
                     28:        halt                            /* PSL not right for this test  */
                     29:                                        /* r0 = 1; r1 = psl; r2 =exp psl */
                     30:        
                     31: /*     Invalidate interrupt stack page table entry in SPT              */
                     32: 1:
                     33:        movab   (sp),r8                 /* Get current ISP */
                     34:        subl2   $4,r8                   /* Address of next push */
                     35:        andl2   $0x3fffffff,r8          /* Mask out bit 30, 31 */
                     36:        shrl    $PGSHIFT,r8,r8          /* Get page no. of this address */
                     37: 
                     38:        andl3   _Sysmap[r8],$0x7fffffff,_Sysmap[r8]     /* Set valid bit off */
                     39:        mtpr    $0,$TBIA                /* Invalidate translation buffer */
                     40: 
                     41:        movl    _scb+SIVEC3,_savvec0    /* Set new vector for soft int #3 */
                     42:        movab   _sivec3,_scb+SIVEC3
                     43:        mtpr    $2,$IPL                 /* Set IPL = 2  */
                     44:        movl    $0xcafebabe,r1
                     45:        mtpr    $3,$SIRR                /* Force soft int level #3 */
                     46:                                /* Since ISP is not valid, the machine  */
                     47:                                /* should halt with r0 = 0, $ r1 = -1   */
                     48:        movpsl  r1
                     49:        movl    $1,r0
                     50:        movab   (sp),r2
                     51:        jmp     *badrtn         /* error code = 2 = r0; did not halt    */
                     52:                                /* when trying to force soft int #3 and */
                     53:                                /* interrupt stack was invalid          */
                     54: 
                     55:        .align  2
                     56: _sivec3:                       /* should not come here either          */
                     57:        movl    $2,r0
                     58:        movab   (sp),r1
                     59:        jmp     *badrtn         /* errorcode = r0 ; took soft int #3    */
                     60:                                /* vector when int stack was invalid    */
                     61: 
                     62: /*     NO RETURN FROM THIS TEST --- IT HALTS                           */
                     63: 

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