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/* $OpenBSD: prom_swpal.S,v 1.2 1996/07/29 23:01:44 niklas Exp $ */
/* $NetBSD: prom_swpal.S,v 1.2 1995/02/16 02:32:58 cgd Exp $ */
/*
* Copyright (c) 1994, 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Keith Bostic
*
* 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.
*/
#include "../../include/asm.h"
#include "../../include/prom.h"
#include "../../include/rpb.h"
/* Offsets from base of HWRPB. */
#define RPB_SELFREF 0x00
#define RPB_SLOTSIZE 0x98
#define RPB_PERCPU_OFF 0xA0
/* Offsets in a boot PCB. */
#define PCB_KSP 0x00
#define PCB_PTBR 0x10
#define PCB_ASN 0x1c
#define PCB_FEN 0x28
/* Pal values. */
#define PAL_RESERVED 0 /* Reserved to Digital. */
#define PAL_VMS 1 /* VMS */
#define PAL_OSF 2 /* OSF */
/*
* PAL code switch routine.
*/
#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 PALSW_FRAME_SIZE (14*8)
#define PALSW_REGS IM_RA|IM_S0|IM_S1|IM_S2|IM_S3|IM_S4|IM_S5
.comm ptbr_save 8
.text
.align 4
NESTED(switch_palcode, 0, PALSW_FRAME_SIZE, ra, PALSW_REGS, 0)
SETGP(pv)
/* ldgp gp, 0(pv)*/
lda sp, -PALSW_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 pv, 0(sp)
stq gp, 8(sp)
ldiq s0, HWRPB_ADDR /* s0 HWRPB_ADDR */
ldq s1, RPB_SLOTSIZE(s0)
call_pal PAL_VMS_mfpr_whami
mulq s1, v0, s1 /* s1 per_cpu offset from base */
ldq s2, RPB_PERCPU_OFF(s0)
addq s0, s2, s2
addq s2, s1, s2 /* s2 PCB (virtual) */
call_pal PAL_VMS_mfpr_ptbr
stq v0, PCB_PTBR(s2)
stq v0, ptbr_save /* save PTBR for the kernel */
stl zero, PCB_ASN(s2)
stq zero, PCB_FEN(s2)
stq sp, PCB_KSP(s2)
ldq t0, RPB_SELFREF(s0) /* HWRBP base (physical) */
ldq t1, RPB_PERCPU_OFF(s0)
addq t0, t1, t0
addq t0, s1, t0 /* PCB base (phys) */
stq t0, 16(sp)
call_pal PAL_VMS_mfpr_vptb
mov v0, a3
/* movi PAL_OSF, a0 */
CONST(PAL_OSF, a0)
lda a1, contin
ldq a2, 16(sp)
call_pal PAL_swppal /* a0, a1, a2, a3 */
contin: ldq pv, 0(sp)
ldq gp, 8(sp)
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)
lda sp, PALSW_FRAME_SIZE(sp)
RET
END(switch_palcode)
#undef D_RA
#undef D_S0
#undef D_S1
#undef D_S2
#undef D_S3
#undef D_S4
#undef D_S5
#undef PALSW_FRAME_SIZE
#undef PALSW_REGS
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