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authorPaul Mundt <lethal@linux-sh.org>2010-02-18 18:13:51 +0900
committerPaul Mundt <lethal@linux-sh.org>2010-02-18 18:13:51 +0900
commitd01447b3197c2c470a14666be2c640407bbbfec7 (patch)
tree06d1b83868e4d3971b781b45607b124718ee2ec0 /arch/sh/mm/Kconfig
parent2e450643d70b62e0192577681b227d7d5d2efa45 (diff)
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sh: Merge legacy and dynamic PMB modes.
This implements a bit of rework for the PMB code, which permits us to kill off the legacy PMB mode completely. Rather than trusting the boot loader to do the right thing, we do a quick verification of the PMB contents to determine whether to have the kernel setup the initial mappings or whether it needs to mangle them later on instead. If we're booting from legacy mappings, the kernel will now take control of them and make them match the kernel's initial mapping configuration. This is accomplished by breaking the initialization phase out in to multiple steps: synchronization, merging, and resizing. With the recent rework, the synchronization code establishes page links for compound mappings already, so we build on top of this for promoting mappings and reclaiming unused slots. At the same time, the changes introduced for the uncached helpers also permit us to dynamically resize the uncached mapping without any particular headaches. The smallest page size is more than sufficient for mapping all of kernel text, and as we're careful not to jump to any far off locations in the setup code the mapping can safely be resized regardless of whether we are executing from it or not. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/mm/Kconfig')
-rw-r--r--arch/sh/mm/Kconfig10
1 files changed, 0 insertions, 10 deletions
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 65cb5b8..1445ca6 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -91,16 +91,6 @@ config PMB
32-bits through the SH-4A PMB. If this is not set, legacy
29-bit physical addressing will be used.
-config PMB_LEGACY
- bool "Support legacy boot mappings for PMB"
- depends on PMB
- select 32BIT
- help
- If this option is enabled, fixed PMB mappings are inherited
- from the boot loader, and the kernel does not attempt dynamic
- management. This is the closest to legacy 29-bit physical mode,
- and allows systems to support up to 512MiB of system memory.
-
config X2TLB
def_bool y
depends on (CPU_SHX2 || CPU_SHX3) && MMU
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