x86/speculation/mds: Fix documentation typo
[linux/fpc-iii.git] / arch / s390 / kernel / base.S
blobb65874b0b412e40ea1baea814fb1169d04f02104
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  *  arch/s390/kernel/base.S
4  *
5  *    Copyright IBM Corp. 2006, 2007
6  *    Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
7  *               Michael Holzheu <holzheu@de.ibm.com>
8  */
10 #include <linux/linkage.h>
11 #include <asm/asm-offsets.h>
12 #include <asm/nospec-insn.h>
13 #include <asm/ptrace.h>
14 #include <asm/sigp.h>
16         GEN_BR_THUNK %r9
17         GEN_BR_THUNK %r14
19 ENTRY(s390_base_mcck_handler)
20         basr    %r13,0
21 0:      lg      %r15,__LC_PANIC_STACK   # load panic stack
22         aghi    %r15,-STACK_FRAME_OVERHEAD
23         larl    %r1,s390_base_mcck_handler_fn
24         lg      %r9,0(%r1)
25         ltgr    %r9,%r9
26         jz      1f
27         BASR_EX %r14,%r9
28 1:      la      %r1,4095
29         lmg     %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)
30         lpswe   __LC_MCK_OLD_PSW
32         .section .bss
33         .align 8
34         .globl  s390_base_mcck_handler_fn
35 s390_base_mcck_handler_fn:
36         .quad   0
37         .previous
39 ENTRY(s390_base_ext_handler)
40         stmg    %r0,%r15,__LC_SAVE_AREA_ASYNC
41         basr    %r13,0
42 0:      aghi    %r15,-STACK_FRAME_OVERHEAD
43         larl    %r1,s390_base_ext_handler_fn
44         lg      %r9,0(%r1)
45         ltgr    %r9,%r9
46         jz      1f
47         BASR_EX %r14,%r9
48 1:      lmg     %r0,%r15,__LC_SAVE_AREA_ASYNC
49         ni      __LC_EXT_OLD_PSW+1,0xfd # clear wait state bit
50         lpswe   __LC_EXT_OLD_PSW
52         .section .bss
53         .align 8
54         .globl s390_base_ext_handler_fn
55 s390_base_ext_handler_fn:
56         .quad   0
57         .previous
59 ENTRY(s390_base_pgm_handler)
60         stmg    %r0,%r15,__LC_SAVE_AREA_SYNC
61         basr    %r13,0
62 0:      aghi    %r15,-STACK_FRAME_OVERHEAD
63         larl    %r1,s390_base_pgm_handler_fn
64         lg      %r9,0(%r1)
65         ltgr    %r9,%r9
66         jz      1f
67         BASR_EX %r14,%r9
68         lmg     %r0,%r15,__LC_SAVE_AREA_SYNC
69         lpswe   __LC_PGM_OLD_PSW
70 1:      lpswe   disabled_wait_psw-0b(%r13)
72         .align  8
73 disabled_wait_psw:
74         .quad   0x0002000180000000,0x0000000000000000 + s390_base_pgm_handler
76         .section .bss
77         .align 8
78         .globl s390_base_pgm_handler_fn
79 s390_base_pgm_handler_fn:
80         .quad   0
81         .previous
84 # Calls diag 308 subcode 1 and continues execution
86 ENTRY(diag308_reset)
87         larl    %r4,.Lctlregs           # Save control registers
88         stctg   %c0,%c15,0(%r4)
89         lg      %r2,0(%r4)              # Disable lowcore protection
90         nilh    %r2,0xefff
91         larl    %r4,.Lctlreg0
92         stg     %r2,0(%r4)
93         lctlg   %c0,%c0,0(%r4)
94         larl    %r4,.Lfpctl             # Floating point control register
95         stfpc   0(%r4)
96         larl    %r4,.Lprefix            # Save prefix register
97         stpx    0(%r4)
98         larl    %r4,.Lprefix_zero       # Set prefix register to 0
99         spx     0(%r4)
100         larl    %r4,.Lcontinue_psw      # Save PSW flags
101         epsw    %r2,%r3
102         stm     %r2,%r3,0(%r4)
103         larl    %r4,.Lrestart_psw       # Setup restart PSW at absolute 0
104         lghi    %r3,0
105         lg      %r4,0(%r4)              # Save PSW
106         sturg   %r4,%r3                 # Use sturg, because of large pages
107         lghi    %r1,1
108         lghi    %r0,0
109         diag    %r0,%r1,0x308
110 .Lrestart_part2:
111         lhi     %r0,0                   # Load r0 with zero
112         lhi     %r1,2                   # Use mode 2 = ESAME (dump)
113         sigp    %r1,%r0,SIGP_SET_ARCHITECTURE   # Switch to ESAME mode
114         sam64                           # Switch to 64 bit addressing mode
115         larl    %r4,.Lctlregs           # Restore control registers
116         lctlg   %c0,%c15,0(%r4)
117         larl    %r4,.Lfpctl             # Restore floating point ctl register
118         lfpc    0(%r4)
119         larl    %r4,.Lprefix            # Restore prefix register
120         spx     0(%r4)
121         larl    %r4,.Lcontinue_psw      # Restore PSW flags
122         lpswe   0(%r4)
123 .Lcontinue:
124         BR_EX   %r14
125 .align 16
126 .Lrestart_psw:
127         .long   0x00080000,0x80000000 + .Lrestart_part2
129         .section .data..nosave,"aw",@progbits
130 .align 8
131 .Lcontinue_psw:
132         .quad   0,.Lcontinue
133         .previous
135         .section .bss
136 .align 8
137 .Lctlreg0:
138         .quad   0
139 .Lctlregs:
140         .rept   16
141         .quad   0
142         .endr
143 .Lfpctl:
144         .long   0
145 .Lprefix:
146         .long   0
147 .Lprefix_zero:
148         .long   0
149         .previous