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1 /*-
2  * Copyright (c) 2000-2001 Doug Rabson
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  *      $FreeBSD$
27  */
28
29 #include <machine/asm.h>
30
31         .data
32         .global ia64_pal_entry
33 ia64_pal_entry: .quad 0
34         .text
35
36 /*
37  * struct ia64_pal_result ia64_call_pal_static(u_int64_t proc,
38  *      u_int64_t arg1, u_int64_t arg2, u_int64_t arg3)
39  */
40 ENTRY(ia64_call_pal_static, 4)
41
42         .regstk 4,4,0,0
43 palret  =       loc0
44 entry   =       loc1
45 rpsave  =       loc2
46 pfssave =       loc3
47
48         alloc   pfssave=ar.pfs,4,4,0,0
49         ;; 
50         mov     rpsave=rp
51         movl    entry=@gprel(ia64_pal_entry)
52
53 1:      mov     palret=ip               // for return address
54         ;;
55         add     entry=entry,gp
56         add     palret=2f-1b,palret     // calculate return address
57         mov     r28=in0                 // procedure number
58         mov     r29=in1                 // copy arguments
59         mov     r30=in2
60         mov     r31=in3
61         ;;
62         ld8     entry=[entry]           // read entry point
63         mov     b0=palret
64         ;;
65         mov     b6=entry
66         ;;
67         br.cond.sptk b6                 // call into firmware
68         ;;
69 2:
70         mov     rp=rpsave
71         mov     ar.pfs=pfssave
72         ;;
73         br.ret.sptk rp
74         ;;
75 END(ia64_call_pal_static)
76
77 /*
78  * struct ia64_pal_result ia64_call_pal_stacked(u_int64_t proc,
79  *      u_int64_t arg1, u_int64_t arg2, u_int64_t arg3)
80  */
81 ENTRY(ia64_call_pal_stacked, 4)
82         
83         .regstk 4,4,4,0
84 entry   =       loc0
85 rpsave  =       loc1
86 pfssave =       loc2
87 psrsave =       loc3
88
89         alloc   pfssave=ar.pfs,4,4,4,0
90         ;; 
91         mov     rpsave=rp
92         movl    entry=@gprel(ia64_pal_entry)
93         ;;
94         add     entry=entry,gp
95         mov     psrsave=psr
96         mov     r28=in0                 // procedure number
97         mov     out0=in0
98         ;;
99         ld8     entry=[entry]           // read entry point
100         mov     out1=in1                // copy arguments
101         mov     out2=in2
102         mov     out3=in3
103         ;;
104         mov     b6=entry
105         ;;
106         rsm     psr.i                   // disable interrupts
107         ;;
108         br.call.sptk.many rp=b6         // call into firmware
109         mov     psr.l=psrsave
110         mov     rp=rpsave
111         mov     ar.pfs=pfssave
112         ;;
113         srlz.d
114         br.ret.sptk rp
115
116 END(ia64_call_pal_stacked)