1*0eebeeb2Smiod /* $OpenBSD: prom.c,v 1.1 2023/03/11 20:56:01 miod Exp $ */
2*0eebeeb2Smiod /* $NetBSD: prom.c,v 1.2 1996/11/25 16:18:16 cgd Exp $ */
3*0eebeeb2Smiod
4*0eebeeb2Smiod /*
5*0eebeeb2Smiod * Mach Operating System
6*0eebeeb2Smiod * Copyright (c) 1992 Carnegie Mellon University
7*0eebeeb2Smiod * All Rights Reserved.
8*0eebeeb2Smiod *
9*0eebeeb2Smiod * Permission to use, copy, modify and distribute this software and its
10*0eebeeb2Smiod * documentation is hereby granted, provided that both the copyright
11*0eebeeb2Smiod * notice and this permission notice appear in all copies of the
12*0eebeeb2Smiod * software, derivative works or modified versions, and any portions
13*0eebeeb2Smiod * thereof, and that both notices appear in supporting documentation.
14*0eebeeb2Smiod *
15*0eebeeb2Smiod * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
16*0eebeeb2Smiod * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
17*0eebeeb2Smiod * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
18*0eebeeb2Smiod *
19*0eebeeb2Smiod * Carnegie Mellon requests users of this software to return to
20*0eebeeb2Smiod *
21*0eebeeb2Smiod * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
22*0eebeeb2Smiod * School of Computer Science
23*0eebeeb2Smiod * Carnegie Mellon University
24*0eebeeb2Smiod * Pittsburgh PA 15213-3890
25*0eebeeb2Smiod *
26*0eebeeb2Smiod * any improvements or extensions that they make and grant Carnegie Mellon
27*0eebeeb2Smiod * the rights to redistribute these changes.
28*0eebeeb2Smiod */
29*0eebeeb2Smiod
30*0eebeeb2Smiod #include <lib/libsa/stand.h>
31*0eebeeb2Smiod
32*0eebeeb2Smiod #include <sys/types.h>
33*0eebeeb2Smiod #include <machine/rpb.h>
34*0eebeeb2Smiod #include <machine/prom.h>
35*0eebeeb2Smiod
36*0eebeeb2Smiod void
init_prom_calls()37*0eebeeb2Smiod init_prom_calls()
38*0eebeeb2Smiod {
39*0eebeeb2Smiod extern struct prom_vec prom_dispatch_v;
40*0eebeeb2Smiod struct rpb *r;
41*0eebeeb2Smiod struct crb *c;
42*0eebeeb2Smiod
43*0eebeeb2Smiod r = (struct rpb *)HWRPB_ADDR;
44*0eebeeb2Smiod c = (struct crb *)((u_int8_t *)r + r->rpb_crb_off);
45*0eebeeb2Smiod
46*0eebeeb2Smiod prom_dispatch_v.routine_arg = c->crb_v_dispatch;
47*0eebeeb2Smiod prom_dispatch_v.routine = c->crb_v_dispatch->entry_va;
48*0eebeeb2Smiod }
49*0eebeeb2Smiod
50*0eebeeb2Smiod int
prom_getenv(id,buf,len)51*0eebeeb2Smiod prom_getenv(id, buf, len)
52*0eebeeb2Smiod int id, len;
53*0eebeeb2Smiod char *buf;
54*0eebeeb2Smiod {
55*0eebeeb2Smiod /*
56*0eebeeb2Smiod * On at least some systems, the GETENV call requires a
57*0eebeeb2Smiod * 8-byte-aligned buffer, or it bails out with a "kernel stack
58*0eebeeb2Smiod * not valid halt". Provide a local, aligned buffer here and
59*0eebeeb2Smiod * then copy to the caller's buffer.
60*0eebeeb2Smiod */
61*0eebeeb2Smiod static char abuf[128] __attribute__ ((aligned (8)));
62*0eebeeb2Smiod prom_return_t ret;
63*0eebeeb2Smiod
64*0eebeeb2Smiod ret.bits = prom_dispatch(PROM_R_GETENV, id, (u_int64_t)abuf, 128, 0);
65*0eebeeb2Smiod if (ret.u.status & 0x4)
66*0eebeeb2Smiod ret.u.retval = 0;
67*0eebeeb2Smiod len--;
68*0eebeeb2Smiod if (len > ret.u.retval)
69*0eebeeb2Smiod len = ret.u.retval;
70*0eebeeb2Smiod memcpy(buf, abuf, len);
71*0eebeeb2Smiod buf[len] = '\0';
72*0eebeeb2Smiod
73*0eebeeb2Smiod return (len);
74*0eebeeb2Smiod }
75