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| author | Tony Lindgren <tony@atomide.com> | 2010-07-05 14:53:10 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-07-09 14:41:35 +0100 |
| commit | f159f4ed55bb0fa5470800641e03a13a7e0eae6e (patch) | |
| tree | c2ed54b103c2a1c58fa4b50740fec462ccfeec74 /arch/arm/kernel/entry-armv.S | |
| parent | c1b2d9704c77ddaec46d5d681e1360ac40268743 (diff) | |
| download | kernel_samsung_smdk4412-f159f4ed55bb0fa5470800641e03a13a7e0eae6e.zip kernel_samsung_smdk4412-f159f4ed55bb0fa5470800641e03a13a7e0eae6e.tar.gz kernel_samsung_smdk4412-f159f4ed55bb0fa5470800641e03a13a7e0eae6e.tar.bz2 | |
ARM: 6207/1: Replace CONFIG_HAS_TLS_REG with HWCAP_TLS and check for it on V6
The TLS register is only available on ARM1136 r1p0 and later.
Set HWCAP_TLS flags if hardware TLS is available and test for
it if CONFIG_CPU_32v6K is not set for V6.
Note that we set the TLS instruction in __kuser_get_tls
dynamically as suggested by Jamie Lokier <jamie@shareable.org>.
Also the __switch_to code is optimized out in most cases as
suggested by Nicolas Pitre <nico@fluxnic.net>.
Reviewed-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/entry-armv.S')
| -rw-r--r-- | arch/arm/kernel/entry-armv.S | 23 |
1 files changed, 7 insertions, 16 deletions
diff --git a/arch/arm/kernel/entry-armv.S b/arch/arm/kernel/entry-armv.S index 7ee48e7..a6cfb17 100644 --- a/arch/arm/kernel/entry-armv.S +++ b/arch/arm/kernel/entry-armv.S @@ -22,6 +22,7 @@ #include <asm/thread_notify.h> #include <asm/unwind.h> #include <asm/unistd.h> +#include <asm/tls.h> #include "entry-header.S" @@ -739,12 +740,7 @@ ENTRY(__switch_to) #ifdef CONFIG_MMU ldr r6, [r2, #TI_CPU_DOMAIN] #endif -#if defined(CONFIG_HAS_TLS_REG) - mcr p15, 0, r3, c13, c0, 3 @ set TLS register -#elif !defined(CONFIG_TLS_REG_EMUL) - mov r4, #0xffff0fff - str r3, [r4, #-15] @ TLS val at 0xffff0ff0 -#endif + set_tls r3, r4, r5 #ifdef CONFIG_MMU mcr p15, 0, r6, c3, c0, 0 @ Set domain register #endif @@ -1009,17 +1005,12 @@ kuser_cmpxchg_fixup: */ __kuser_get_tls: @ 0xffff0fe0 - -#if !defined(CONFIG_HAS_TLS_REG) && !defined(CONFIG_TLS_REG_EMUL) - ldr r0, [pc, #(16 - 8)] @ TLS stored at 0xffff0ff0 -#else - mrc p15, 0, r0, c13, c0, 3 @ read TLS register -#endif + ldr r0, [pc, #(16 - 8)] @ read TLS, set in kuser_get_tls_init usr_ret lr - - .rep 5 - .word 0 @ pad up to __kuser_helper_version - .endr + mrc p15, 0, r0, c13, c0, 3 @ 0xffff0fe8 hardware TLS code + .rep 4 + .word 0 @ 0xffff0ff0 software TLS value, then + .endr @ pad up to __kuser_helper_version /* * Reference declaration: |