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a80313ff GS |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* | |
3 | * Code that needs to run below 2 GB. | |
4 | * | |
5 | * Copyright IBM Corp. 2019 | |
6 | */ | |
7 | ||
8 | #include <linux/linkage.h> | |
d09a307f | 9 | #include <asm/asm-extable.h> |
a80313ff GS |
10 | #include <asm/errno.h> |
11 | #include <asm/sigp.h> | |
12 | ||
c78d0c74 | 13 | .section .amode31.text,"ax" |
a80313ff GS |
14 | /* |
15 | * Simplified version of expoline thunk. The normal thunks can not be used here, | |
16 | * because they might be more than 2 GB away, and not reachable by the relative | |
17 | * branch. No comdat, exrl, etc. optimizations used here, because it only | |
18 | * affects a few functions that are not performance-relevant. | |
19 | */ | |
c78d0c74 | 20 | .macro BR_EX_AMODE31_r14 |
463f36c7 AE |
21 | larl %r1,0f |
22 | ex 0,0(%r1) | |
23 | j . | |
24 | 0: br %r14 | |
a80313ff GS |
25 | .endm |
26 | ||
27 | /* | |
c78d0c74 | 28 | * int _diag14_amode31(unsigned long rx, unsigned long ry1, unsigned long subcode) |
a80313ff | 29 | */ |
c78d0c74 | 30 | ENTRY(_diag14_amode31) |
a80313ff GS |
31 | lgr %r1,%r2 |
32 | lgr %r2,%r3 | |
33 | lgr %r3,%r4 | |
34 | lhi %r5,-EIO | |
35 | sam31 | |
36 | diag %r1,%r2,0x14 | |
37 | .Ldiag14_ex: | |
38 | ipm %r5 | |
39 | srl %r5,28 | |
40 | .Ldiag14_fault: | |
41 | sam64 | |
42 | lgfr %r2,%r5 | |
c78d0c74 HC |
43 | BR_EX_AMODE31_r14 |
44 | EX_TABLE_AMODE31(.Ldiag14_ex, .Ldiag14_fault) | |
45 | ENDPROC(_diag14_amode31) | |
a80313ff GS |
46 | |
47 | /* | |
c78d0c74 | 48 | * int _diag210_amode31(struct diag210 *addr) |
a80313ff | 49 | */ |
c78d0c74 | 50 | ENTRY(_diag210_amode31) |
a80313ff GS |
51 | lgr %r1,%r2 |
52 | lhi %r2,-1 | |
53 | sam31 | |
54 | diag %r1,%r0,0x210 | |
55 | .Ldiag210_ex: | |
56 | ipm %r2 | |
57 | srl %r2,28 | |
58 | .Ldiag210_fault: | |
59 | sam64 | |
60 | lgfr %r2,%r2 | |
c78d0c74 HC |
61 | BR_EX_AMODE31_r14 |
62 | EX_TABLE_AMODE31(.Ldiag210_ex, .Ldiag210_fault) | |
63 | ENDPROC(_diag210_amode31) | |
a80313ff GS |
64 | |
65 | /* | |
c78d0c74 | 66 | * int _diag26c_amode31(void *req, void *resp, enum diag26c_sc subcode) |
a80313ff | 67 | */ |
c78d0c74 | 68 | ENTRY(_diag26c_amode31) |
a80313ff GS |
69 | lghi %r5,-EOPNOTSUPP |
70 | sam31 | |
71 | diag %r2,%r4,0x26c | |
72 | .Ldiag26c_ex: | |
73 | sam64 | |
74 | lgfr %r2,%r5 | |
c78d0c74 HC |
75 | BR_EX_AMODE31_r14 |
76 | EX_TABLE_AMODE31(.Ldiag26c_ex, .Ldiag26c_ex) | |
77 | ENDPROC(_diag26c_amode31) | |
a80313ff GS |
78 | |
79 | /* | |
c78d0c74 | 80 | * void _diag0c_amode31(struct hypfs_diag0c_entry *entry) |
a80313ff | 81 | */ |
c78d0c74 | 82 | ENTRY(_diag0c_amode31) |
a80313ff GS |
83 | sam31 |
84 | diag %r2,%r2,0x0c | |
85 | sam64 | |
c78d0c74 HC |
86 | BR_EX_AMODE31_r14 |
87 | ENDPROC(_diag0c_amode31) | |
a80313ff | 88 | |
a80313ff | 89 | /* |
c78d0c74 | 90 | * void _diag308_reset_amode31(void) |
a80313ff GS |
91 | * |
92 | * Calls diag 308 subcode 1 and continues execution | |
93 | */ | |
c78d0c74 | 94 | ENTRY(_diag308_reset_amode31) |
a80313ff GS |
95 | larl %r4,.Lctlregs # Save control registers |
96 | stctg %c0,%c15,0(%r4) | |
97 | lg %r2,0(%r4) # Disable lowcore protection | |
98 | nilh %r2,0xefff | |
99 | larl %r4,.Lctlreg0 | |
100 | stg %r2,0(%r4) | |
101 | lctlg %c0,%c0,0(%r4) | |
102 | larl %r4,.Lfpctl # Floating point control register | |
103 | stfpc 0(%r4) | |
104 | larl %r4,.Lprefix # Save prefix register | |
105 | stpx 0(%r4) | |
106 | larl %r4,.Lprefix_zero # Set prefix register to 0 | |
107 | spx 0(%r4) | |
108 | larl %r4,.Lcontinue_psw # Save PSW flags | |
109 | epsw %r2,%r3 | |
110 | stm %r2,%r3,0(%r4) | |
2879048c | 111 | larl %r4,.Lrestart_part2 # Setup restart PSW at absolute 0 |
a80313ff GS |
112 | larl %r3,.Lrestart_diag308_psw |
113 | og %r4,0(%r3) # Save PSW | |
114 | lghi %r3,0 | |
115 | sturg %r4,%r3 # Use sturg, because of large pages | |
116 | lghi %r1,1 | |
117 | lghi %r0,0 | |
118 | diag %r0,%r1,0x308 | |
2879048c | 119 | .Lrestart_part2: |
a80313ff GS |
120 | lhi %r0,0 # Load r0 with zero |
121 | lhi %r1,2 # Use mode 2 = ESAME (dump) | |
122 | sigp %r1,%r0,SIGP_SET_ARCHITECTURE # Switch to ESAME mode | |
123 | sam64 # Switch to 64 bit addressing mode | |
124 | larl %r4,.Lctlregs # Restore control registers | |
125 | lctlg %c0,%c15,0(%r4) | |
126 | larl %r4,.Lfpctl # Restore floating point ctl register | |
127 | lfpc 0(%r4) | |
128 | larl %r4,.Lprefix # Restore prefix register | |
129 | spx 0(%r4) | |
130 | larl %r4,.Lcontinue_psw # Restore PSW flags | |
7accd1f8 AE |
131 | larl %r2,.Lcontinue |
132 | stg %r2,8(%r4) | |
a80313ff GS |
133 | lpswe 0(%r4) |
134 | .Lcontinue: | |
c78d0c74 HC |
135 | BR_EX_AMODE31_r14 |
136 | ENDPROC(_diag308_reset_amode31) | |
a80313ff | 137 | |
c78d0c74 | 138 | .section .amode31.data,"aw",@progbits |
a80313ff GS |
139 | .align 8 |
140 | .Lrestart_diag308_psw: | |
141 | .long 0x00080000,0x80000000 | |
142 | ||
143 | .align 8 | |
144 | .Lcontinue_psw: | |
7accd1f8 | 145 | .quad 0,0 |
a80313ff GS |
146 | |
147 | .align 8 | |
148 | .Lctlreg0: | |
149 | .quad 0 | |
150 | .Lctlregs: | |
151 | .rept 16 | |
152 | .quad 0 | |
153 | .endr | |
154 | .Lfpctl: | |
155 | .long 0 | |
156 | .Lprefix: | |
157 | .long 0 | |
158 | .Lprefix_zero: | |
159 | .long 0 |