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pseries: Add H_SET_MODE to change exception endianness

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On little endian builds call H_SET_MODE so exceptions have the
correct endianness. We need to reset the endian during kexec
so do that in the MMU hashtable clear callback.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Anton Blanchard
2013-11-20 22:14:59 +11:00
committed by Benjamin Herrenschmidt
parent b91da2d4ce
commit e844b1eeae
4 changed files with 87 additions and 0 deletions
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26
arch/powerpc/include/asm/plpar_wrappers.h
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@@ -287,6 +287,32 @@ static inline long disable_reloc_on_exceptions(void) {
return plpar_set_mode(0, 3, 0, 0);
}
/*
* Take exceptions in big endian mode on this partition
*
* Note: this call has a partition wide scope and can take a while to complete.
* If it returns H_LONG_BUSY_* it should be retried periodically until it
* returns H_SUCCESS.
*/
static inline long enable_big_endian_exceptions(void)
{
/* mflags = 0: big endian exceptions */
return plpar_set_mode(0, 4, 0, 0);
}
/*
* Take exceptions in little endian mode on this partition
*
* Note: this call has a partition wide scope and can take a while to complete.
* If it returns H_LONG_BUSY_* it should be retried periodically until it
* returns H_SUCCESS.
*/
static inline long enable_little_endian_exceptions(void)
{
/* mflags = 1: little endian exceptions */
return plpar_set_mode(1, 4, 0, 0);
}
static inline long plapr_set_ciabr(unsigned long ciabr)
{
return plpar_set_mode(0, 1, ciabr, 0);