2 * $FreeBSD: src/sys/boot/alpha/libalpha/prom_disp.S,v 1.2 1999/08/28 00:39:28 peter Exp $
3 * From: $NetBSD: prom_disp.S,v 1.2 1997/04/06 08:41:00 cgd Exp $
7 * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
10 * Author: Chris G. Demetriou
12 * Permission to use, copy, modify and distribute this software and
13 * its documentation is hereby granted, provided that both the copyright
14 * notice and this permission notice appear in all copies of the
15 * software, derivative works or modified versions, and any portions
16 * thereof, and that both notices appear in supporting documentation.
18 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
19 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
20 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
22 * Carnegie Mellon requests users of this software to return to
24 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
25 * School of Computer Science
26 * Carnegie Mellon University
27 * Pittsburgh PA 15213-3890
29 * any improvements or extensions that they make and grant Carnegie the
30 * rights to redistribute these changes.
35 #include <machine/asm.h>
36 #include <machine/prom.h>
37 #include <machine/rpb.h>
40 .globl prom_dispatch_v
41 .comm prom_dispatch_v,16
47 * Dispatcher routine. Implements prom's calling machinery, saves our
48 * callee-saved registers as required by C.
58 #define DISPATCH_FRAME_SIZE (15*8)
59 #define DISPATCH_REGS IM_RA|IM_S0|IM_S1|IM_S2|IM_S3|IM_S4|IM_S5|IM_S6
61 NESTED(prom_dispatch, 5, DISPATCH_FRAME_SIZE, ra, DISPATCH_REGS, 0)
64 lda sp, -DISPATCH_FRAME_SIZE(sp)
74 /* Lord have mercy because.. I would not. */
75 /* #define STUPID_PROM_IS_32_BITS */
76 #ifdef STUPID_PROM_IS_32_BITS
77 ldah s0, 0x2000(zero) /* hack for hack */
78 lda s0, (0x2000-8)(s0)
82 #endif /* STUPID_PROM_IS_32_BITS */
84 lda pv, prom_dispatch_v
85 ldq v0, 0(pv) /* routine */
86 ldq pv, 8(pv) /* routine_arg */
90 #ifdef STUPID_PROM_IS_32_BITS
91 ldah s0, 0x2000(zero) /* hack for hack */
92 lda s0, (0x2000-8)(s0)
95 #endif /* STUPID_PROM_IS_32_BITS */
105 lda sp, DISPATCH_FRAME_SIZE(sp)
117 #undef DISPATCH_FRAME_SIZE