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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-01-04 20:04:00 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-02-18 00:27:30 +0100 |
| commit | 72a20e22f49e2dad3180c23980a9df1c63faab0a (patch) | |
| tree | 97edaa9db248ecc7e9a6a66c1ef5a054412af5c2 /arch/arm/mach-h720x/cpu-h7201.c | |
| parent | ARM: P2V: avoid initializers and assembly using PHYS_OFFSET (diff) | |
| download | linux-72a20e22f49e2dad3180c23980a9df1c63faab0a.tar.xz linux-72a20e22f49e2dad3180c23980a9df1c63faab0a.zip | |
ARM: P2V: eliminate head.S use of PHYS_OFFSET for !XIP_KERNEL
head.S makes use of PHYS_OFFSET. When it becomes a variable, the
assembler won't understand this. Compute PHYS_OFFSET by the following
method. This code is linked at its virtual address, but run at before
the MMU is enabled, so at his physical address.
1: .long .
.long PAGE_OFFSET
adr r0, 1b @ r0 = physical ','
ldmia r0, {r1, r2} @ r1 = virtual '.', r2 = PAGE_OFFSET
sub r1, r0, r1 @ r1 = physical-virtual
add r2, r2, r1 @ r2 = PAGE_OFFSET + physical-virtual
@ := PHYS_OFFSET.
Switch XIP users of PHYS_OFFSET to use PLAT_PHYS_OFFSET - we can't
use this method for XIP kernels as the code doesn't execute in RAM.
Tested-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mach-h720x/cpu-h7201.c')
0 files changed, 0 insertions, 0 deletions