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prom_disp.S revision 1.2 
      1 /* $NetBSD: prom_disp.S,v 1.2 1997/04/06 08:41:00 cgd Exp $ */
      2 
      3 /*
      4  * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
      5  * All rights reserved.
      6  *
      7  * Author: Chris G. Demetriou
      8  *
      9  * Permission to use, copy, modify and distribute this software and
     10  * its documentation is hereby granted, provided that both the copyright
     11  * notice and this permission notice appear in all copies of the
     12  * software, derivative works or modified versions, and any portions
     13  * thereof, and that both notices appear in supporting documentation.
     14  *
     15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     18  *
     19  * Carnegie Mellon requests users of this software to return to
     20  *
     21  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     22  *  School of Computer Science
     23  *  Carnegie Mellon University
     24  *  Pittsburgh PA 15213-3890
     25  *
     26  * any improvements or extensions that they make and grant Carnegie the
     27  * rights to redistribute these changes.
     28  */
     29 
     30 #ifndef _LOCORE
     31 #include "include/asm.h"
     32 #include "include/prom.h"
     33 #include "include/rpb.h"
     34 #endif
     35 
     36 	.globl	prom_dispatch_v
     37 	.comm	prom_dispatch_v,16
     38 
     39 	.text
     40 	.align	4
     41 
     42 /*
     43  * Dispatcher routine.  Implements prom's calling machinery, saves our
     44  * callee-saved registers as required by C.
     45  */
     46 #define	D_RA			 (7*8)
     47 #define	D_S0			 (8*8)
     48 #define	D_S1			 (9*8)
     49 #define	D_S2			(10*8)
     50 #define	D_S3			(11*8)
     51 #define	D_S4			(12*8)
     52 #define	D_S5			(13*8)
     53 #define	D_S6			(14*8)
     54 #define	DISPATCH_FRAME_SIZE	(15*8)
     55 #define	DISPATCH_REGS		IM_RA|IM_S0|IM_S1|IM_S2|IM_S3|IM_S4|IM_S5|IM_S6
     56 
     57 NESTED(prom_dispatch, 5, DISPATCH_FRAME_SIZE, ra, DISPATCH_REGS, 0)
     58 	LDGP(pv)
     59 
     60 	lda	sp, -DISPATCH_FRAME_SIZE(sp)
     61 	stq	ra, D_RA(sp)
     62 	stq	s0, D_S0(sp)
     63 	stq	s1, D_S1(sp)
     64 	stq	s2, D_S2(sp)
     65 	stq	s3, D_S3(sp)
     66 	stq	s4, D_S4(sp)
     67 	stq	s5, D_S5(sp)
     68 	stq	s6, D_S6(sp)
     69 
     70 	/* Lord have mercy because.. I would not. */
     71 /* #define	STUPID_PROM_IS_32_BITS */
     72 #ifdef	STUPID_PROM_IS_32_BITS
     73 	ldah	s0, 0x2000(zero)	/* hack for hack */
     74 	lda	s0, (0x2000-8)(s0)
     75 
     76 	stq	sp, 0(s0)
     77 	or	s0, zero, sp
     78 #endif	/* STUPID_PROM_IS_32_BITS */
     79 
     80 	lda	pv, prom_dispatch_v
     81 	ldq	v0, 0(pv)		/* routine */
     82 	ldq	pv, 8(pv)		/* routine_arg */
     83 
     84 	jsr	ra, (v0)
     85 
     86 #ifdef	STUPID_PROM_IS_32_BITS
     87 	ldah	s0, 0x2000(zero)	/* hack for hack */
     88 	lda	s0, (0x2000-8)(s0)
     89 
     90 	ldq	sp, 0(s0)
     91 #endif	/* STUPID_PROM_IS_32_BITS */
     92 
     93 	ldq	ra, D_RA(sp)
     94 	ldq	s0, D_S0(sp)
     95 	ldq	s1, D_S1(sp)
     96 	ldq	s2, D_S2(sp)
     97 	ldq	s3, D_S3(sp)
     98 	ldq	s4, D_S4(sp)
     99 	ldq	s5, D_S5(sp)
    100 	ldq	s6, D_S6(sp)
    101 	lda	sp, DISPATCH_FRAME_SIZE(sp)
    102 	RET
    103 END(prom_dispatch)
    104 
    105 #undef	D_RA
    106 #undef	D_S0
    107 #undef	D_S1
    108 #undef	D_S2
    109 #undef	D_S3
    110 #undef	D_S4
    111 #undef	D_S5
    112 #undef	D_S6
    113 #undef	DISPATCH_FRAME_SIZE
    114 #undef	DISPATCH_REGS
    115