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f931f67cfc
Use static branch(es) to implement and use machine_has_scc() instead of a runtime check via MACHINE_HAS_SCC. This comes with a cleanup of early time initialization: the initial tod_clock_base value is now passed via the bootdata mechanism, instead of using absolute lowcore as transport vehicle from the decompressor to the kernel. Also the early tod clock initialization is moved to the decompressor which allows to use a static branch with machine_has_scc() within the kernel. Reviewed-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
40 lines
975 B
ArmAsm
40 lines
975 B
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright IBM Corp. 1999, 2010
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*
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* Author(s): Hartmut Penner <hp@de.ibm.com>
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* Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Rob van der Heij <rvdhei@iae.nl>
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*
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*/
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#include <linux/init.h>
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#include <linux/linkage.h>
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#include <asm/lowcore.h>
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#include <asm/asm-offsets.h>
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#include <asm/thread_info.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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__HEAD
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SYM_CODE_START(startup_continue)
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#
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# Setup stack
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#
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GET_LC %r2
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larl %r14,init_task
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stg %r14,__LC_CURRENT(%r2)
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larl %r15,init_thread_union+STACK_INIT_OFFSET
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stg %r15,__LC_KERNEL_STACK(%r2)
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brasl %r14,sclp_early_adjust_va # allow sclp_early_printk
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brasl %r14,startup_init # s390 specific early init
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brasl %r14,start_kernel # common init code
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#
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# We returned from start_kernel ?!? PANIK
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#
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basr %r13,0
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lpswe dw_psw-.(%r13) # load disabled wait psw
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SYM_CODE_END(startup_continue)
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.balign 16
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SYM_DATA_LOCAL(dw_psw, .quad 0x0002000180000000,0x0000000000000000)
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