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