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authorHeiko Carstens <heiko.carstens@de.ibm.com>2007-02-05 21:18:37 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2007-02-05 21:18:37 +0100
commitab14de6c37fae22911ba99f4171613e6d758050b (patch)
tree7545169fe9d64a82616ae37f2b6c1a420c77f30f /arch/s390/kernel/base.S
parent31ee4b2f40994e8b21691f85cdd4052551a789b7 (diff)
downloadop-kernel-dev-ab14de6c37fae22911ba99f4171613e6d758050b.zip
op-kernel-dev-ab14de6c37fae22911ba99f4171613e6d758050b.tar.gz
[S390] Convert memory detection into C code.
Hopefully this will make it more maintainable and less error prone. Code makes use of search_exception_tables(). Since it calls this function before the kernel exeception table is sorted, there is an early call to sort_main_extable(). This way it's easy to use the already present infrastructure of fixup sections. Also this would allows to easily convert the rest of head[31|64].S into C code. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/base.S')
-rw-r--r--arch/s390/kernel/base.S150
1 files changed, 150 insertions, 0 deletions
diff --git a/arch/s390/kernel/base.S b/arch/s390/kernel/base.S
new file mode 100644
index 0000000..dc7e525
--- /dev/null
+++ b/arch/s390/kernel/base.S
@@ -0,0 +1,150 @@
+/*
+ * 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 <asm/ptrace.h>
+#include <asm/lowcore.h>
+
+#ifdef CONFIG_64BIT
+
+ .globl s390_base_mcck_handler
+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 %r1,0(%r1)
+ ltgr %r1,%r1
+ jz 1f
+ basr %r14,%r1
+1: la %r1,4095
+ lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)
+ lpswe __LC_MCK_OLD_PSW
+
+ .section .bss
+ .globl s390_base_mcck_handler_fn
+s390_base_mcck_handler_fn:
+ .quad 0
+ .previous
+
+ .globl s390_base_ext_handler
+s390_base_ext_handler:
+ stmg %r0,%r15,__LC_SAVE_AREA
+ basr %r13,0
+0: aghi %r15,-STACK_FRAME_OVERHEAD
+ larl %r1,s390_base_ext_handler_fn
+ lg %r1,0(%r1)
+ ltgr %r1,%r1
+ jz 1f
+ basr %r14,%r1
+1: lmg %r0,%r15,__LC_SAVE_AREA
+ ni __LC_EXT_OLD_PSW+1,0xfd # clear wait state bit
+ lpswe __LC_EXT_OLD_PSW
+
+ .section .bss
+ .globl s390_base_ext_handler_fn
+s390_base_ext_handler_fn:
+ .quad 0
+ .previous
+
+ .globl s390_base_pgm_handler
+s390_base_pgm_handler:
+ stmg %r0,%r15,__LC_SAVE_AREA
+ basr %r13,0
+0: aghi %r15,-STACK_FRAME_OVERHEAD
+ larl %r1,s390_base_pgm_handler_fn
+ lg %r1,0(%r1)
+ ltgr %r1,%r1
+ jz 1f
+ basr %r14,%r1
+ lmg %r0,%r15,__LC_SAVE_AREA
+ 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
+ .globl s390_base_pgm_handler_fn
+s390_base_pgm_handler_fn:
+ .quad 0
+ .previous
+
+#else /* CONFIG_64BIT */
+
+ .globl s390_base_mcck_handler
+s390_base_mcck_handler:
+ basr %r13,0
+0: l %r15,__LC_PANIC_STACK # load panic stack
+ ahi %r15,-STACK_FRAME_OVERHEAD
+ l %r1,2f-0b(%r13)
+ l %r1,0(%r1)
+ ltr %r1,%r1
+ jz 1f
+ basr %r14,%r1
+1: lm %r0,%r15,__LC_GPREGS_SAVE_AREA
+ lpsw __LC_MCK_OLD_PSW
+
+2: .long s390_base_mcck_handler_fn
+
+ .section .bss
+ .globl s390_base_mcck_handler_fn
+s390_base_mcck_handler_fn:
+ .long 0
+ .previous
+
+ .globl s390_base_ext_handler
+s390_base_ext_handler:
+ stm %r0,%r15,__LC_SAVE_AREA
+ basr %r13,0
+0: ahi %r15,-STACK_FRAME_OVERHEAD
+ l %r1,2f-0b(%r13)
+ l %r1,0(%r1)
+ ltr %r1,%r1
+ jz 1f
+ basr %r14,%r1
+1: lm %r0,%r15,__LC_SAVE_AREA
+ ni __LC_EXT_OLD_PSW+1,0xfd # clear wait state bit
+ lpsw __LC_EXT_OLD_PSW
+
+2: .long s390_base_ext_handler_fn
+
+ .section .bss
+ .globl s390_base_ext_handler_fn
+s390_base_ext_handler_fn:
+ .long 0
+ .previous
+
+ .globl s390_base_pgm_handler
+s390_base_pgm_handler:
+ stm %r0,%r15,__LC_SAVE_AREA
+ basr %r13,0
+0: ahi %r15,-STACK_FRAME_OVERHEAD
+ l %r1,2f-0b(%r13)
+ l %r1,0(%r1)
+ ltr %r1,%r1
+ jz 1f
+ basr %r14,%r1
+ lm %r0,%r15,__LC_SAVE_AREA
+ lpsw __LC_PGM_OLD_PSW
+
+1: lpsw disabled_wait_psw-0b(%r13)
+
+2: .long s390_base_pgm_handler_fn
+
+disabled_wait_psw:
+ .align 8
+ .long 0x000a0000,0x00000000 + s390_base_pgm_handler
+
+ .section .bss
+ .globl s390_base_pgm_handler_fn
+s390_base_pgm_handler_fn:
+ .long 0
+ .previous
+
+#endif /* CONFIG_64BIT */
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