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powerpc/book3s: Add an HV variant of FIXUP_ENDIAN that is recoverable 

Add an HV variant of FIXUP_ENDIAN which uses HSRR[01] and does not
clear MSR[RI], which improves recoverability.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nicholas Piggin 2017-10-23 17:08:14 +10:00 committed by Michael Ellerman
parent f848ea7f59
commit 8ca9c08d0c
1 changed files with 22 additions and 0 deletions
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22
arch/powerpc/include/asm/ppc_asm.h
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@ -774,6 +774,10 @@ END_FTR_SECTION_IFCLR(CPU_FTR_601)
#ifdef CONFIG_PPC_BOOK3E
#define FIXUP_ENDIAN
#else
/*
* This version may be used in in HV or non-HV context.
* MSR[EE] must be disabled.
*/
#define FIXUP_ENDIAN \
tdi 0,0,0x48; /* Reverse endian of b . + 8 */ \
b 191f; /* Skip trampoline if endian is good */ \
@ -789,6 +793,24 @@ END_FTR_SECTION_IFCLR(CPU_FTR_601)
.long 0x2400004c; /* rfid */ \
191:
/*
* This version that may only be used with MSR[HV]=1
* - Does not clear MSR[RI], so more robust.
* - Slightly smaller and faster.
*/
#define FIXUP_ENDIAN_HV \
tdi 0,0,0x48; /* Reverse endian of b . + 8 */ \
b 191f; /* Skip trampoline if endian is good */ \
.long 0xa600607d; /* mfmsr r11 */ \
.long 0x01006b69; /* xori r11,r11,1 */ \
.long 0x05009f42; /* bcl 20,31,$+4 */ \
.long 0xa602487d; /* mflr r10 */ \
.long 0x14004a39; /* addi r10,r10,20 */ \
.long 0xa64b5a7d; /* mthsrr0 r10 */ \
.long 0xa64b7b7d; /* mthsrr1 r11 */ \
.long 0x2402004c; /* hrfid */ \
191:
#endif /* !CONFIG_PPC_BOOK3E */
#endif /* __ASSEMBLY__ */