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| author | Catalin Marinas <catalin.marinas@arm.com> | 2006-03-07 14:42:27 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-03-07 14:42:27 +0000 |
| commit | 6a0e243069b09a323255f6e847c87d531961cd96 (patch) | |
| tree | 575a7194c86b2b3e1b9db30e283a2f5705e89e99 /include/asm-arm | |
| parent | d11d9b2dd2c43dd99a491df8a83ae28401db0044 (diff) | |
| download | lwn-6a0e243069b09a323255f6e847c87d531961cd96.tar.gz lwn-6a0e243069b09a323255f6e847c87d531961cd96.zip | |
[ARM] 3352/1: DSB required for the completion of a TLB maintenance operation
Patch from Catalin Marinas
Chapter B2.7.3 in the latest ARM ARM (with v6 information) states that
the completion of a TLB maintenance operation is only guaranteed by
the execution of a DSB (Data Syncronization Barrier, formerly Data
Write Barrier or Drain Write Buffer).
Note that a DSB is only needed in the flush_tlb_kernel_* functions
since the completion is guaranteed by a mode change (i.e. switching
back to user mode) for the flush_tlb_user_* functions.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'include/asm-arm')
| -rw-r--r-- | include/asm-arm/tlbflush.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/asm-arm/tlbflush.h b/include/asm-arm/tlbflush.h index 9387a5e1ffe0..0c2acc944a0a 100644 --- a/include/asm-arm/tlbflush.h +++ b/include/asm-arm/tlbflush.h @@ -340,6 +340,12 @@ static inline void local_flush_tlb_kernel_page(unsigned long kaddr) asm("mcr%? p15, 0, %0, c8, c6, 1" : : "r" (kaddr)); if (tlb_flag(TLB_V6_I_PAGE)) asm("mcr%? p15, 0, %0, c8, c5, 1" : : "r" (kaddr)); + + /* The ARM ARM states that the completion of a TLB maintenance + * operation is only guaranteed by a DSB instruction + */ + if (tlb_flag(TLB_V6_U_PAGE | TLB_V6_D_PAGE | TLB_V6_I_PAGE)) + asm("mcr%? p15, 0, %0, c7, c10, 4" : : "r" (zero)); } /* |