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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2007-02-05 23:18:37 +0300 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2007-02-05 23:18:37 +0300 |
| commit | ab14de6c37fae22911ba99f4171613e6d758050b (patch) | |
| tree | 7545169fe9d64a82616ae37f2b6c1a420c77f30f /arch/s390/kernel/base.S | |
| parent | 31ee4b2f40994e8b21691f85cdd4052551a789b7 (diff) | |
| download | linux-ab14de6c37fae22911ba99f4171613e6d758050b.tar.xz | |
[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.S | 150 |
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 000000000000..dc7e5259770f --- /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 */ |