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authorMax Filippov <jcmvbkbc@gmail.com>2016-04-11 21:14:17 +0300
committerMax Filippov <jcmvbkbc@gmail.com>2016-07-24 06:33:58 +0300
commitd39af90265feb40ec198c4ca8268724645b4b50e (patch)
tree32c3aed4a66a243251ca0a9e195c4ba8e6dddeeb /arch/xtensa/Kconfig
parentf1883aa7d63e3be92ad18da7a1bfc6c9b15c4f9a (diff)
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xtensa: add alternative kernel memory layouts
MMUv3 is able to support low memory bigger than 128MB. Implement 256MB and 512MB KSEG layouts: - add Kconfig selector for KSEG layout; - add KSEG base address, size and alignment definitions to arch/xtensa/include/asm/kmem_layout.h; - use new definitions in TLB initialization; - add build time memory map consistency checks. See Documentation/xtensa/mmu.txt for the details of new memory layouts. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/Kconfig')
-rw-r--r--arch/xtensa/Kconfig44
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 64336f666fb6..c17496bc37f0 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -236,6 +236,50 @@ config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
If in doubt, say Y.
+config KSEG_PADDR
+ hex "Physical address of the KSEG mapping"
+ depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX && MMU
+ default 0x00000000
+ help
+ This is the physical address where KSEG is mapped. Please refer to
+ the chosen KSEG layout help for the required address alignment.
+ Unpacked kernel image (including vectors) must be located completely
+ within KSEG.
+ Physical memory below this address is not available to linux.
+
+ If unsure, leave the default value here.
+
+choice
+ prompt "KSEG layout"
+ depends on MMU
+ default XTENSA_KSEG_MMU_V2
+
+config XTENSA_KSEG_MMU_V2
+ bool "MMUv2: 128MB cached + 128MB uncached"
+ help
+ MMUv2 compatible kernel memory map: TLB way 5 maps 128MB starting
+ at KSEG_PADDR to 0xd0000000 with cache and to 0xd8000000
+ without cache.
+ KSEG_PADDR must be aligned to 128MB.
+
+config XTENSA_KSEG_256M
+ bool "256MB cached + 256MB uncached"
+ depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
+ help
+ TLB way 6 maps 256MB starting at KSEG_PADDR to 0xb0000000
+ with cache and to 0xc0000000 without cache.
+ KSEG_PADDR must be aligned to 256MB.
+
+config XTENSA_KSEG_512M
+ bool "512MB cached + 512MB uncached"
+ depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
+ help
+ TLB way 6 maps 512MB starting at KSEG_PADDR to 0xa0000000
+ with cache and to 0xc0000000 without cache.
+ KSEG_PADDR must be aligned to 256MB.
+
+endchoice
+
config HIGHMEM
bool "High Memory Support"
depends on MMU