kernel.git/arch/arm/kernel/head.S, branch linux-2.6.37.y

ARM: smp_on_up: allow non-ARM SMP processors

2011-02-17T23:14:44Z

commit e98ff0f55a0232b578c9aa7f1c245868277ac7bc upstream. Allow non-ARM SMP processors to use the SMP_ON_UP feature. CPUs supporting SMP must have the new CPU ID format, so check for this first. Then check for ARM11MPCore, which fails the MPIDR check. Lastly check the MPIDR reports multiprocessing extensions and that the CPU is part of a multiprocessing system. Reported-and-Tested-by: Stephen Boyd Acked-by: Will Deacon Signed-off-by: Russell King Signed-off-by: Greg Kroah-Hartman

ARM: SMP: use more sane register allocation for __fixup_smp_on_up

2011-02-17T23:14:43Z

commit 0eb0511d176534674600a1986c3c766756288908 upstream. Use r0,r3-r6 rather than r0,r3,r4,r6,r7, which makes it easier to understand which registers can be modified. Also document which registers hold values which must be preserved. Signed-off-by: Russell King Signed-off-by: Greg Kroah-Hartman

ARM: 6504/1: Thumb-2: Fix long-distance conditional branches in head.S for Thumb-2.

2010-11-30T13:44:26Z

The 32-bit conditional branches in Thumb-2 have a shorter range (+/-512K) than their ARM counterparts (+/-32MB). The linker does not currently generate trampolines to extend the range of these Thumb-2 conditional branches, resulting in link errors when vmlinux is sufficiently large, e.g.: head.o:(.text+0x464): relocation truncated to fit: R_ARM_THM_JUMP19 This patch forces the longer-range, unconditional branch encoding by use of an explicit IT instruction. The resulting branches are triggered on the same conditions as before. Signed-off-by: Dave Martin Signed-off-by: Russell King

ARM: 6500/1: Thumb-2: Correct data alignment for CONFIG_THUMB2_KERNEL in kernel/head.S

2010-11-30T13:44:24Z

Directives such as .long and .word do not magically cause the assembler location counter to become aligned in gas. As a result, using these directives in code sections can result in misaligned data words when building a Thumb-2 kernel (CONFIG_THUMB2_KERNEL). This is a Bad Thing, since the ABI permits the compiler to assume that fundamental types of word size or above are word- aligned when accessing them from C. If the data is not really word-aligned, this can cause impaired performance and stray alignment faults in some circumstances. In general, the following rules should be applied when using data word declaration directives inside code sections: * .quad and .double: .align 3 * .long, .word, .single, .float: .align (or .align 2) * .short: No explicit alignment required, since Thumb-2 instructions are always 2 or 4 bytes in size. immediately after an instruction. Reviewed-by: Will Deacon Signed-off-by: Dave Martin Acked-by: Catalin Marinas Signed-off-by: Russell King

arm: use addruart macro to establish debug mappings

2010-10-20T04:27:34Z

Since we can get both physical and virtual addresses from the addruart macro, we can use this to establish the debug mappings. In the case of CONFIG_DEBUG_ICEDCC, we don't need any mappings, but may still need to setup r7 correctly. Incorporating ASM changes from Nicolas Pitre . Signed-off-by: Jeremy Kerr Tested-by: Kevin Hilman

Merge branch 'hotplug' into devel

2010-10-18T21:34:47Z

Conflicts: arch/arm/kernel/head-common.S

ARM: add register documentation for __enable_mmu

2010-10-08T09:07:35Z

Add some additional documentation on register usage in __enable_mmu to help complete the overall picture. Signed-off-by: Russell King

ARM: hotplug cpu: move secondary_startup, __enable_mmu to cpuinit

2010-10-08T09:07:35Z

Move these two functions, both of which are required for secondary CPU booting, into the cpuinit section. Ensure bad processors call __error_p for better diagnostics, rather than just __error. Signed-off-by: Russell King

ARM: hotplug cpu: ensure that __enable_mmu is identity mapped

2010-10-08T09:07:34Z

__enable_mmu is required to be executed in an identity mapped region to ensure that variances in CPUs do not cause a crash. We currently achieve this by assuming that it will be co-located with __create_page_tables. With hotplug CPU support, this assumption becomes invalid. Implement a better solution which ensures that it will be appropriately mapped no matter where it is placed. Signed-off-by: Russell King

ARM: cleanup boot cpu calling __mmap_switched

2010-10-08T09:07:32Z

This allows us to relocate __mmap_switched and associated data away from the head section. Signed-off-by: Russell King