diff options
Diffstat (limited to 'arch/s390/kernel/base.S')
-rw-r--r-- | arch/s390/kernel/base.S | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/s390/kernel/base.S b/arch/s390/kernel/base.S index 209938c1dfc..255435663bf 100644 --- a/arch/s390/kernel/base.S +++ b/arch/s390/kernel/base.S | |||
@@ -76,6 +76,42 @@ s390_base_pgm_handler_fn: | |||
76 | .quad 0 | 76 | .quad 0 |
77 | .previous | 77 | .previous |
78 | 78 | ||
79 | # | ||
80 | # Calls diag 308 subcode 1 and continues execution | ||
81 | # | ||
82 | # The following conditions must be ensured before calling this function: | ||
83 | # * Prefix register = 0 | ||
84 | # * Lowcore protection is disabled | ||
85 | # | ||
86 | ENTRY(diag308_reset) | ||
87 | larl %r4,.Lctlregs # Save control registers | ||
88 | stctg %c0,%c15,0(%r4) | ||
89 | larl %r4,.Lrestart_psw # Setup restart PSW at absolute 0 | ||
90 | lghi %r3,0 | ||
91 | lg %r4,0(%r4) # Save PSW | ||
92 | sturg %r4,%r3 # Use sturg, because of large pages | ||
93 | lghi %r1,1 | ||
94 | diag %r1,%r1,0x308 | ||
95 | .Lrestart_part2: | ||
96 | lhi %r0,0 # Load r0 with zero | ||
97 | lhi %r1,2 # Use mode 2 = ESAME (dump) | ||
98 | sigp %r1,%r0,0x12 # Switch to ESAME mode | ||
99 | sam64 # Switch to 64 bit addressing mode | ||
100 | larl %r4,.Lctlregs # Restore control registers | ||
101 | lctlg %c0,%c15,0(%r4) | ||
102 | br %r14 | ||
103 | .align 16 | ||
104 | .Lrestart_psw: | ||
105 | .long 0x00080000,0x80000000 + .Lrestart_part2 | ||
106 | |||
107 | .section .bss | ||
108 | .align 8 | ||
109 | .Lctlregs: | ||
110 | .rept 16 | ||
111 | .quad 0 | ||
112 | .endr | ||
113 | .previous | ||
114 | |||
79 | #else /* CONFIG_64BIT */ | 115 | #else /* CONFIG_64BIT */ |
80 | 116 | ||
81 | ENTRY(s390_base_mcck_handler) | 117 | ENTRY(s390_base_mcck_handler) |