microblaze_mmu_v2: Kconfig update

Signed-off-by: Michal Simek <monstr@monstr.eu>

1 files changed, 109 insertions, 3 deletions

diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index f8e0722df0cf..b50b845fdd50 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -54,11 +54,9 @@ config GENERIC_GPIO
         def_bool y
 
 config PCI
-        depends on !MMU
         def_bool n
 
 config NO_DMA
-        depends on !MMU
         def_bool y
 
 source "init/Kconfig"
@@ -76,7 +74,8 @@ source "kernel/Kconfig.preempt"
 source "kernel/Kconfig.hz"
 
 config MMU
-        def_bool n
+        bool "MMU support"
+        default n
 
 config NO_MMU
         bool
@@ -119,6 +118,113 @@ config PROC_DEVICETREE
 
 endmenu
 
+menu "Advanced setup"
+
+config ADVANCED_OPTIONS
+        bool "Prompt for advanced kernel configuration options"
+        depends on MMU
+        help
+          This option will enable prompting for a variety of advanced kernel
+          configuration options.  These options can cause the kernel to not
+          work if they are set incorrectly, but can be used to optimize certain
+          aspects of kernel memory management.
+
+          Unless you know what you are doing, say N here.
+
+comment "Default settings for advanced configuration options are used"
+        depends on !ADVANCED_OPTIONS
+
+config HIGHMEM_START_BOOL
+        bool "Set high memory pool address"
+        depends on ADVANCED_OPTIONS && HIGHMEM
+        help
+          This option allows you to set the base address of the kernel virtual
+          area used to map high memory pages.  This can be useful in
+          optimizing the layout of kernel virtual memory.
+
+          Say N here unless you know what you are doing.
+
+config HIGHMEM_START
+        hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
+        depends on MMU
+        default "0xfe000000"
+
+config LOWMEM_SIZE_BOOL
+        bool "Set maximum low memory"
+        depends on ADVANCED_OPTIONS
+        help
+          This option allows you to set the maximum amount of memory which
+          will be used as "low memory", that is, memory which the kernel can
+          access directly, without having to set up a kernel virtual mapping.
+          This can be useful in optimizing the layout of kernel virtual
+          memory.
+
+          Say N here unless you know what you are doing.
+
+config LOWMEM_SIZE
+        hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
+        depends on MMU
+        default "0x30000000"
+
+config KERNEL_START_BOOL
+        bool "Set custom kernel base address"
+        depends on ADVANCED_OPTIONS
+        help
+          This option allows you to set the kernel virtual address at which
+          the kernel will map low memory (the kernel image will be linked at
+          this address).  This can be useful in optimizing the virtual memory
+          layout of the system.
+
+          Say N here unless you know what you are doing.
+
+config KERNEL_START
+        hex "Virtual address of kernel base" if KERNEL_START_BOOL
+        default "0xc0000000" if MMU
+        default KERNEL_BASE_ADDR if !MMU
+
+config TASK_SIZE_BOOL
+        bool "Set custom user task size"
+        depends on ADVANCED_OPTIONS
+        help
+          This option allows you to set the amount of virtual address space
+          allocated to user tasks.  This can be useful in optimizing the
+          virtual memory layout of the system.
+
+          Say N here unless you know what you are doing.
+
+config TASK_SIZE
+        hex "Size of user task space" if TASK_SIZE_BOOL
+        depends on MMU
+        default "0x80000000"
+
+config CONSISTENT_START_BOOL
+        bool "Set custom consistent memory pool address"
+        depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
+        help
+          This option allows you to set the base virtual address
+          of the the consistent memory pool.  This pool of virtual
+          memory is used to make consistent memory allocations.
+
+config CONSISTENT_START
+        hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
+        depends on MMU
+        default "0xff100000" if NOT_COHERENT_CACHE
+
+config CONSISTENT_SIZE_BOOL
+        bool "Set custom consistent memory pool size"
+        depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
+        help
+          This option allows you to set the size of the the
+          consistent memory pool.  This pool of virtual memory
+          is used to make consistent memory allocations.
+
+config CONSISTENT_SIZE
+        hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
+        depends on MMU
+        default "0x00200000" if NOT_COHERENT_CACHE
+
+endmenu
+
 source "mm/Kconfig"
 
 menu "Exectuable file formats"