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-rw-r--r--arch/s390/kernel/base.S149
1 files changed, 149 insertions, 0 deletions
diff --git a/arch/s390/kernel/base.S b/arch/s390/kernel/base.S
new file mode 100644
index 000000000..b65874b0b
--- /dev/null
+++ b/arch/s390/kernel/base.S
@@ -0,0 +1,149 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * arch/s390/kernel/base.S
+ *
+ * Copyright IBM Corp. 2006, 2007
+ * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
+ * Michael Holzheu <holzheu@de.ibm.com>
+ */
+
+#include <linux/linkage.h>
+#include <asm/asm-offsets.h>
+#include <asm/nospec-insn.h>
+#include <asm/ptrace.h>
+#include <asm/sigp.h>
+
+ GEN_BR_THUNK %r9
+ GEN_BR_THUNK %r14
+
+ENTRY(s390_base_mcck_handler)
+ basr %r13,0
+0: lg %r15,__LC_PANIC_STACK # load panic stack
+ aghi %r15,-STACK_FRAME_OVERHEAD
+ larl %r1,s390_base_mcck_handler_fn
+ lg %r9,0(%r1)
+ ltgr %r9,%r9
+ jz 1f
+ BASR_EX %r14,%r9
+1: la %r1,4095
+ lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)
+ lpswe __LC_MCK_OLD_PSW
+
+ .section .bss
+ .align 8
+ .globl s390_base_mcck_handler_fn
+s390_base_mcck_handler_fn:
+ .quad 0
+ .previous
+
+ENTRY(s390_base_ext_handler)
+ stmg %r0,%r15,__LC_SAVE_AREA_ASYNC
+ basr %r13,0
+0: aghi %r15,-STACK_FRAME_OVERHEAD
+ larl %r1,s390_base_ext_handler_fn
+ lg %r9,0(%r1)
+ ltgr %r9,%r9
+ jz 1f
+ BASR_EX %r14,%r9
+1: lmg %r0,%r15,__LC_SAVE_AREA_ASYNC
+ ni __LC_EXT_OLD_PSW+1,0xfd # clear wait state bit
+ lpswe __LC_EXT_OLD_PSW
+
+ .section .bss
+ .align 8
+ .globl s390_base_ext_handler_fn
+s390_base_ext_handler_fn:
+ .quad 0
+ .previous
+
+ENTRY(s390_base_pgm_handler)
+ stmg %r0,%r15,__LC_SAVE_AREA_SYNC
+ basr %r13,0
+0: aghi %r15,-STACK_FRAME_OVERHEAD
+ larl %r1,s390_base_pgm_handler_fn
+ lg %r9,0(%r1)
+ ltgr %r9,%r9
+ jz 1f
+ BASR_EX %r14,%r9
+ lmg %r0,%r15,__LC_SAVE_AREA_SYNC
+ lpswe __LC_PGM_OLD_PSW
+1: lpswe disabled_wait_psw-0b(%r13)
+
+ .align 8
+disabled_wait_psw:
+ .quad 0x0002000180000000,0x0000000000000000 + s390_base_pgm_handler
+
+ .section .bss
+ .align 8
+ .globl s390_base_pgm_handler_fn
+s390_base_pgm_handler_fn:
+ .quad 0
+ .previous
+
+#
+# Calls diag 308 subcode 1 and continues execution
+#
+ENTRY(diag308_reset)
+ larl %r4,.Lctlregs # Save control registers
+ stctg %c0,%c15,0(%r4)
+ lg %r2,0(%r4) # Disable lowcore protection
+ nilh %r2,0xefff
+ larl %r4,.Lctlreg0
+ stg %r2,0(%r4)
+ lctlg %c0,%c0,0(%r4)
+ larl %r4,.Lfpctl # Floating point control register
+ stfpc 0(%r4)
+ larl %r4,.Lprefix # Save prefix register
+ stpx 0(%r4)
+ larl %r4,.Lprefix_zero # Set prefix register to 0
+ spx 0(%r4)
+ larl %r4,.Lcontinue_psw # Save PSW flags
+ epsw %r2,%r3
+ stm %r2,%r3,0(%r4)
+ larl %r4,.Lrestart_psw # Setup restart PSW at absolute 0
+ lghi %r3,0
+ lg %r4,0(%r4) # Save PSW
+ sturg %r4,%r3 # Use sturg, because of large pages
+ lghi %r1,1
+ lghi %r0,0
+ diag %r0,%r1,0x308
+.Lrestart_part2:
+ lhi %r0,0 # Load r0 with zero
+ lhi %r1,2 # Use mode 2 = ESAME (dump)
+ sigp %r1,%r0,SIGP_SET_ARCHITECTURE # Switch to ESAME mode
+ sam64 # Switch to 64 bit addressing mode
+ larl %r4,.Lctlregs # Restore control registers
+ lctlg %c0,%c15,0(%r4)
+ larl %r4,.Lfpctl # Restore floating point ctl register
+ lfpc 0(%r4)
+ larl %r4,.Lprefix # Restore prefix register
+ spx 0(%r4)
+ larl %r4,.Lcontinue_psw # Restore PSW flags
+ lpswe 0(%r4)
+.Lcontinue:
+ BR_EX %r14
+.align 16
+.Lrestart_psw:
+ .long 0x00080000,0x80000000 + .Lrestart_part2
+
+ .section .data..nosave,"aw",@progbits
+.align 8
+.Lcontinue_psw:
+ .quad 0,.Lcontinue
+ .previous
+
+ .section .bss
+.align 8
+.Lctlreg0:
+ .quad 0
+.Lctlregs:
+ .rept 16
+ .quad 0
+ .endr
+.Lfpctl:
+ .long 0
+.Lprefix:
+ .long 0
+.Lprefix_zero:
+ .long 0
+ .previous