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| author | Catalin Marinas <catalin.marinas@arm.com> | 2012-01-09 12:24:47 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-01-13 08:56:41 +0000 |
| commit | 294064f58953f9964e5945424b09c51800330a83 (patch) | |
| tree | b0593f1aaa41a96e23140934c1e54cc97020e9a2 | |
| parent | e37051dc7f35de5ce3f64c40852365ff24f2436c (diff) | |
| download | blackbird-op-linux-294064f58953f9964e5945424b09c51800330a83.tar.gz blackbird-op-linux-294064f58953f9964e5945424b09c51800330a83.zip | |
ARM: 7275/1: LPAE: Check the CPU support for the long descriptor format
This patch adds a check for the presence of the LPAE feature during the
CPU initialisation. If not present, it reports an error when
CONFIG_DEBUG_LL is enabled.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/kernel/head.S | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S index 14e277d2ff91..6d5791144066 100644 --- a/arch/arm/kernel/head.S +++ b/arch/arm/kernel/head.S @@ -99,6 +99,14 @@ ENTRY(stext) THUMB( it eq ) @ force fixup-able long branch encoding beq __error_p @ yes, error 'p' +#ifdef CONFIG_ARM_LPAE + mrc p15, 0, r3, c0, c1, 4 @ read ID_MMFR0 + and r3, r3, #0xf @ extract VMSA support + cmp r3, #5 @ long-descriptor translation table format? + THUMB( it lo ) @ force fixup-able long branch encoding + blo __error_p @ only classic page table format +#endif + #ifndef CONFIG_XIP_KERNEL adr r3, 2f ldmia r3, {r4, r8} |
