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Annotation of sys/arch/alpha/stand/boot/prom_swpal.S, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: prom_swpal.S,v 1.3 1996/10/30 22:40:45 niklas Exp $   */
        !             2: /*     $NetBSD: prom_swpal.S,v 1.4 1996/10/17 02:50:41 cgd Exp $       */
        !             3:
        !             4: /*
        !             5:  * Copyright (c) 1994, 1995 Carnegie-Mellon University.
        !             6:  * All rights reserved.
        !             7:  *
        !             8:  * Author: Keith Bostic
        !             9:  *
        !            10:  * Permission to use, copy, modify and distribute this software and
        !            11:  * its documentation is hereby granted, provided that both the copyright
        !            12:  * notice and this permission notice appear in all copies of the
        !            13:  * software, derivative works or modified versions, and any portions
        !            14:  * thereof, and that both notices appear in supporting documentation.
        !            15:  *
        !            16:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            17:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
        !            18:  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            19:  *
        !            20:  * Carnegie Mellon requests users of this software to return to
        !            21:  *
        !            22:  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
        !            23:  *  School of Computer Science
        !            24:  *  Carnegie Mellon University
        !            25:  *  Pittsburgh PA 15213-3890
        !            26:  *
        !            27:  * any improvements or extensions that they make and grant Carnegie the
        !            28:  * rights to redistribute these changes.
        !            29:  */
        !            30:
        !            31: #include "../../include/asm.h"
        !            32: #include "../../include/prom.h"
        !            33: #include "../../include/rpb.h"
        !            34:
        !            35: /* Offsets from base of HWRPB. */
        !            36: #define        RPB_SELFREF     0x00
        !            37: #define        RPB_SLOTSIZE    0x98
        !            38: #define        RPB_PERCPU_OFF  0xA0
        !            39:
        !            40: /* Offsets in a boot PCB. */
        !            41: #define        PCB_KSP         0x00
        !            42: #define        PCB_PTBR        0x10
        !            43: #define        PCB_ASN         0x1c
        !            44: #define        PCB_FEN         0x28
        !            45:
        !            46: /* Pal values. */
        !            47: #define PAL_RESERVED   0               /* Reserved to Digital. */
        !            48: #define PAL_VMS                1               /* VMS */
        !            49: #define PAL_OSF                2               /* OSF */
        !            50:
        !            51: /*
        !            52:  * PAL code switch routine.
        !            53:  */
        !            54: #define        D_RA                     (7*8)
        !            55: #define        D_S0                     (8*8)
        !            56: #define        D_S1                     (9*8)
        !            57: #define        D_S2                    (10*8)
        !            58: #define        D_S3                    (11*8)
        !            59: #define        D_S4                    (12*8)
        !            60: #define        D_S5                    (13*8)
        !            61: #define        PALSW_FRAME_SIZE        (14*8)
        !            62: #define        PALSW_REGS              IM_RA|IM_S0|IM_S1|IM_S2|IM_S3|IM_S4|IM_S5
        !            63:
        !            64:        .comm   ptbr_save,8
        !            65:
        !            66:        .text
        !            67:        .align  4
        !            68:
        !            69: NESTED(switch_palcode, 0, PALSW_FRAME_SIZE, ra, PALSW_REGS, 0)
        !            70:        LDGP(pv)
        !            71: /*     ldgp    gp, 0(pv)*/
        !            72:
        !            73:        lda     sp, -PALSW_FRAME_SIZE(sp)
        !            74:        stq     ra, D_RA(sp)
        !            75:        stq     s0, D_S0(sp)
        !            76:        stq     s1, D_S1(sp)
        !            77:        stq     s2, D_S2(sp)
        !            78:        stq     s3, D_S3(sp)
        !            79:        stq     s4, D_S4(sp)
        !            80:        stq     s5, D_S5(sp)
        !            81:
        !            82:        stq     pv, 0(sp)
        !            83:        stq     gp, 8(sp)
        !            84:
        !            85:        ldiq    s0, HWRPB_ADDR          /* s0 HWRPB_ADDR */
        !            86:        ldq     s1, RPB_SLOTSIZE(s0)
        !            87:        call_pal PAL_VMS_mfpr_whami
        !            88:        mulq    s1, v0, s1              /* s1 per_cpu offset from base */
        !            89:        ldq     s2, RPB_PERCPU_OFF(s0)
        !            90:        addq    s0, s2, s2
        !            91:        addq    s2, s1, s2              /* s2  PCB (virtual) */
        !            92:
        !            93:        call_pal PAL_VMS_mfpr_ptbr
        !            94:        stq     v0,   PCB_PTBR(s2)
        !            95:        stq     v0,   ptbr_save         /* save PTBR for the kernel */
        !            96:        stl     zero, PCB_ASN(s2)
        !            97:        stq     zero, PCB_FEN(s2)
        !            98:        stq     sp,   PCB_KSP(s2)
        !            99:
        !           100:        ldq     t0, RPB_SELFREF(s0)     /* HWRBP base (physical) */
        !           101:        ldq     t1, RPB_PERCPU_OFF(s0)
        !           102:        addq    t0, t1, t0
        !           103:        addq    t0, s1, t0              /* PCB base (phys) */
        !           104:        stq     t0, 16(sp)
        !           105:
        !           106:        call_pal PAL_VMS_mfpr_vptb
        !           107:        mov     v0, a3
        !           108:        ldiq    a0, PAL_OSF
        !           109:        lda     a1, contin
        !           110:        ldq     a2, 16(sp)
        !           111:
        !           112:        call_pal PAL_swppal             /* a0, a1, a2, a3 */
        !           113:
        !           114: contin:        ldq     pv, 0(sp)
        !           115:        ldq     gp, 8(sp)
        !           116:
        !           117:        ldq     ra, D_RA(sp)
        !           118:        ldq     s0, D_S0(sp)
        !           119:        ldq     s1, D_S1(sp)
        !           120:        ldq     s2, D_S2(sp)
        !           121:        ldq     s3, D_S3(sp)
        !           122:        ldq     s4, D_S4(sp)
        !           123:        ldq     s5, D_S5(sp)
        !           124:        lda     sp, PALSW_FRAME_SIZE(sp)
        !           125:        RET
        !           126: END(switch_palcode)
        !           127:
        !           128: #undef D_RA
        !           129: #undef D_S0
        !           130: #undef D_S1
        !           131: #undef D_S2
        !           132: #undef D_S3
        !           133: #undef D_S4
        !           134: #undef D_S5
        !           135: #undef PALSW_FRAME_SIZE
        !           136: #undef PALSW_REGS