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| author |  Christophe Leroy <christophe.leroy@c-s.fr>
| 2019-12-21 08:32:27 +0000 |
|---|---|---|
| committer |  Michael Ellerman <mpe@ellerman.id.au>
| 2020-01-26 22:15:09 +1100 |
| commit | 028474876f472c3b6eee633aed528a1206609657 (patch) | |
| tree | ddf5742f1232e48a0665eb5b0a157caa28567a17 /arch/powerpc/include/asm/thread_info.h | |
| parent | powerpc/32: add a macro to get and/or save DAR and DSISR on stack. (diff) | |
| download | linux-028474876f472c3b6eee633aed528a1206609657.tar.gz linux-028474876f472c3b6eee633aed528a1206609657.tar.bz2 linux-028474876f472c3b6eee633aed528a1206609657.zip | |
powerpc/32: prepare for CONFIG_VMAP_STACK
To support CONFIG_VMAP_STACK, the kernel has to activate Data MMU
Translation for accessing the stack. Before doing that it must save
SRR0, SRR1 and also DAR and DSISR when relevant, in order to not
loose them in case there is a Data TLB Miss once the translation is
reactivated.
This patch adds fields in thread struct for saving those registers.
It prepares entry_32.S to handle exception entry with
Data MMU Translation enabled and alters EXCEPTION_PROLOG macros to
save SRR0, SRR1, DAR and DSISR then reenables Data MMU.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/a775a1fea60f190e0f63503463fb775310a2009b.1576916812.git.christophe.leroy@c-s.fr
Diffstat (limited to 'arch/powerpc/include/asm/thread_info.h')
| -rw-r--r-- | arch/powerpc/include/asm/thread_info.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h index 8e1d0195ac36..488d5c4670ff 100644 --- a/arch/powerpc/include/asm/thread_info.h +++ b/arch/powerpc/include/asm/thread_info.h @@ -10,10 +10,15 @@ #define _ASM_POWERPC_THREAD_INFO_H #include <asm/asm-const.h> +#include <asm/page.h> #ifdef __KERNEL__ +#if defined(CONFIG_VMAP_STACK) && CONFIG_THREAD_SHIFT < PAGE_SHIFT +#define THREAD_SHIFT PAGE_SHIFT +#else #define THREAD_SHIFT CONFIG_THREAD_SHIFT +#endif #define THREAD_SIZE (1 << THREAD_SHIFT) |