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ARM: 6207/1: Replace CONFIG_HAS_TLS_REG with HWCAP_TLS and check for it on V6

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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>
This commit is contained in:
Tony Lindgren
2010-07-05 14:53:10 +01:00
committed by Russell King
parent c1b2d9704c
commit f159f4ed55
8 changed files with 105 additions and 41 deletions
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17
arch/arm/kernel/setup.c
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@@ -269,6 +269,21 @@ static void __init cacheid_init(void)
extern struct proc_info_list *lookup_processor_type(unsigned int);
extern struct machine_desc *lookup_machine_type(unsigned int);
static void __init feat_v6_fixup(void)
{
int id = read_cpuid_id();
if ((id & 0xff0f0000) != 0x41070000)
return;
/*
* HWCAP_TLS is available only on 1136 r1p0 and later,
* see also kuser_get_tls_init.
*/
if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
elf_hwcap &= ~HWCAP_TLS;
}
static void __init setup_processor(void)
{
struct proc_info_list *list;
@@ -311,6 +326,8 @@ static void __init setup_processor(void)
elf_hwcap &= ~HWCAP_THUMB;
#endif
feat_v6_fixup();
cacheid_init();
cpu_proc_init();
}