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/* $OpenBSD: prom_disp.S,v 1.4 1996/10/30 22:40:34 niklas Exp $ */
/* $NetBSD: prom_disp.S,v 1.5 1996/10/17 02:50:39 cgd Exp $ */
/*
* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#ifndef _LOCORE
#include "include/asm.h"
#include "include/prom.h"
#include "include/rpb.h"
#endif
.globl prom_dispatch_v
.comm prom_dispatch_v,16
.text
.align 4
/*
* Dispatcher routine. Implements prom's calling machinery, saves our
* callee-saved registers as required by C.
*/
#define D_RA (7*8)
#define D_S0 (8*8)
#define D_S1 (9*8)
#define D_S2 (10*8)
#define D_S3 (11*8)
#define D_S4 (12*8)
#define D_S5 (13*8)
#define D_S6 (14*8)
#define DISPATCH_FRAME_SIZE (15*8)
#define DISPATCH_REGS IM_RA|IM_S0|IM_S1|IM_S2|IM_S3|IM_S4|IM_S5|IM_S6
NESTED(prom_dispatch, 5, DISPATCH_FRAME_SIZE, ra, DISPATCH_REGS, 0)
LDGP(pv)
lda sp, -DISPATCH_FRAME_SIZE(sp)
stq ra, D_RA(sp)
stq s0, D_S0(sp)
stq s1, D_S1(sp)
stq s2, D_S2(sp)
stq s3, D_S3(sp)
stq s4, D_S4(sp)
stq s5, D_S5(sp)
stq s6, D_S6(sp)
/* Lord have mercy because.. I would not. */
/* #define STUPID_PROM_IS_32_BITS */
#ifdef STUPID_PROM_IS_32_BITS
ldah s0, 0x2000(zero) /* hack for hack */
lda s0, (0x2000-8)(s0)
stq sp, 0(s0)
or s0, zero, sp
#endif /* STUPID_PROM_IS_32_BITS */
lda pv, prom_dispatch_v
ldq v0, 0(pv) /* routine */
ldq pv, 8(pv) /* routine_arg */
jsr ra, (v0)
#ifdef STUPID_PROM_IS_32_BITS
ldah s0, 0x2000(zero) /* hack for hack */
lda s0, (0x2000-8)(s0)
ldq sp, 0(s0)
#endif /* STUPID_PROM_IS_32_BITS */
ldq ra, D_RA(sp)
ldq s0, D_S0(sp)
ldq s1, D_S1(sp)
ldq s2, D_S2(sp)
ldq s3, D_S3(sp)
ldq s4, D_S4(sp)
ldq s5, D_S5(sp)
ldq s6, D_S6(sp)
lda sp, DISPATCH_FRAME_SIZE(sp)
RET
END(prom_dispatch)
#undef D_RA
#undef D_S0
#undef D_S1
#undef D_S2
#undef D_S3
#undef D_S4
#undef D_S5
#undef D_S6
#undef DISPATCH_FRAME_SIZE
#undef DISPATCH_REGS
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