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Annotation of sys/arch/alpha/stand/prom_disp.S, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: prom_disp.S,v 1.4 1996/10/30 22:40:34 niklas Exp $    */
                      2: /*     $NetBSD: prom_disp.S,v 1.5 1996/10/17 02:50:39 cgd Exp $        */
                      3:
                      4: /*
                      5:  * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
                      6:  * All rights reserved.
                      7:  *
                      8:  * Author: Chris G. Demetriou
                      9:  *
                     10:  * Permission to use, copy, modify and distribute this software and
                     11:  * its documentation is hereby granted, provided that both the copyright
                     12:  * notice and this permission notice appear in all copies of the
                     13:  * software, derivative works or modified versions, and any portions
                     14:  * thereof, and that both notices appear in supporting documentation.
                     15:  *
                     16:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     17:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
                     18:  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     19:  *
                     20:  * Carnegie Mellon requests users of this software to return to
                     21:  *
                     22:  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
                     23:  *  School of Computer Science
                     24:  *  Carnegie Mellon University
                     25:  *  Pittsburgh PA 15213-3890
                     26:  *
                     27:  * any improvements or extensions that they make and grant Carnegie the
                     28:  * rights to redistribute these changes.
                     29:  */
                     30:
                     31: #ifndef _LOCORE
                     32: #include "include/asm.h"
                     33: #include "include/prom.h"
                     34: #include "include/rpb.h"
                     35: #endif
                     36:
                     37:        .globl  prom_dispatch_v
                     38:        .comm   prom_dispatch_v,16
                     39:
                     40:        .text
                     41:        .align  4
                     42:
                     43: /*
                     44:  * Dispatcher routine.  Implements prom's calling machinery, saves our
                     45:  * callee-saved registers as required by C.
                     46:  */
                     47: #define        D_RA                     (7*8)
                     48: #define        D_S0                     (8*8)
                     49: #define        D_S1                     (9*8)
                     50: #define        D_S2                    (10*8)
                     51: #define        D_S3                    (11*8)
                     52: #define        D_S4                    (12*8)
                     53: #define        D_S5                    (13*8)
                     54: #define        D_S6                    (14*8)
                     55: #define        DISPATCH_FRAME_SIZE     (15*8)
                     56: #define        DISPATCH_REGS           IM_RA|IM_S0|IM_S1|IM_S2|IM_S3|IM_S4|IM_S5|IM_S6
                     57:
                     58: NESTED(prom_dispatch, 5, DISPATCH_FRAME_SIZE, ra, DISPATCH_REGS, 0)
                     59:        LDGP(pv)
                     60:
                     61:        lda     sp, -DISPATCH_FRAME_SIZE(sp)
                     62:        stq     ra, D_RA(sp)
                     63:        stq     s0, D_S0(sp)
                     64:        stq     s1, D_S1(sp)
                     65:        stq     s2, D_S2(sp)
                     66:        stq     s3, D_S3(sp)
                     67:        stq     s4, D_S4(sp)
                     68:        stq     s5, D_S5(sp)
                     69:        stq     s6, D_S6(sp)
                     70:
                     71:        /* Lord have mercy because.. I would not. */
                     72: /* #define     STUPID_PROM_IS_32_BITS */
                     73: #ifdef STUPID_PROM_IS_32_BITS
                     74:        ldah    s0, 0x2000(zero)        /* hack for hack */
                     75:        lda     s0, (0x2000-8)(s0)
                     76:
                     77:        stq     sp, 0(s0)
                     78:        or      s0, zero, sp
                     79: #endif /* STUPID_PROM_IS_32_BITS */
                     80:
                     81:        lda     pv, prom_dispatch_v
                     82:        ldq     v0, 0(pv)               /* routine */
                     83:        ldq     pv, 8(pv)               /* routine_arg */
                     84:
                     85:        jsr     ra, (v0)
                     86:
                     87: #ifdef STUPID_PROM_IS_32_BITS
                     88:        ldah    s0, 0x2000(zero)        /* hack for hack */
                     89:        lda     s0, (0x2000-8)(s0)
                     90:
                     91:        ldq     sp, 0(s0)
                     92: #endif /* STUPID_PROM_IS_32_BITS */
                     93:
                     94:        ldq     ra, D_RA(sp)
                     95:        ldq     s0, D_S0(sp)
                     96:        ldq     s1, D_S1(sp)
                     97:        ldq     s2, D_S2(sp)
                     98:        ldq     s3, D_S3(sp)
                     99:        ldq     s4, D_S4(sp)
                    100:        ldq     s5, D_S5(sp)
                    101:        ldq     s6, D_S6(sp)
                    102:        lda     sp, DISPATCH_FRAME_SIZE(sp)
                    103:        RET
                    104: END(prom_dispatch)
                    105:
                    106: #undef D_RA
                    107: #undef D_S0
                    108: #undef D_S1
                    109: #undef D_S2
                    110: #undef D_S3
                    111: #undef D_S4
                    112: #undef D_S5
                    113: #undef D_S6
                    114: #undef DISPATCH_FRAME_SIZE
                    115: #undef DISPATCH_REGS