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s390/kernel: Introduce memcpy_absolute() function

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This patch introduces the new function memcpy_absolute() that allows to
copy memory using absolute addressing. This means that the prefix swap
does not apply when this function is used.

With this patch also all s390 kernel code that accesses absolute zero
now uses the new memcpy_absolute() function. The old and less generic
copy_to_absolute_zero() function is removed.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Holzheu
2012-05-24 14:35:16 +02:00
committed by Martin Schwidefsky
parent f4815ac6c9
commit 73bf463efa
5 changed files with 33 additions and 34 deletions
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12
arch/s390/kernel/setup.c
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@@ -428,10 +428,12 @@ static void __init setup_lowcore(void)
lc->restart_fn = (unsigned long) do_restart;
lc->restart_data = 0;
lc->restart_source = -1UL;
memcpy(&S390_lowcore.restart_stack, &lc->restart_stack,
4*sizeof(unsigned long));
copy_to_absolute_zero(&S390_lowcore.restart_psw,
&lc->restart_psw, sizeof(psw_t));
/* Setup absolute zero lowcore */
memcpy_absolute(&S390_lowcore.restart_stack, &lc->restart_stack,
4 * sizeof(unsigned long));
memcpy_absolute(&S390_lowcore.restart_psw, &lc->restart_psw,
sizeof(lc->restart_psw));
set_prefix((u32)(unsigned long) lc);
lowcore_ptr[0] = lc;
@@ -598,7 +600,7 @@ static void __init setup_vmcoreinfo(void)
#ifdef CONFIG_KEXEC
unsigned long ptr = paddr_vmcoreinfo_note();
copy_to_absolute_zero(&S390_lowcore.vmcore_info, &ptr, sizeof(ptr));
memcpy_absolute(&S390_lowcore.vmcore_info, &ptr, sizeof(ptr));
#endif
}