diff options
| author | Steven J. Hill <Steven.Hill@imgtec.com> | 2015-02-26 18:16:38 -0600 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-03-19 17:39:49 +0100 |
| commit | c5b367835cfc7a8ef53b9670a409ffcc95194344 (patch) | |
| tree | 23a6be89021f93b09bb0f2340bc995c21bcab79b /arch/mips/Kconfig | |
| parent | be0c37c985eddc46d0d67543898c086f60460e2e (diff) | |
MIPS: Add support for XPA.
Add support for extended physical addressing (XPA) so that
32-bit platforms can access equal to or greater than 40 bits
of physical addresses.
NOTE:
1) XPA and EVA are not the same and cannot be used
simultaneously.
2) If you configure your kernel for XPA, the PTEs
and all address sizes become 64-bit.
3) Your platform MUST have working HIGHMEM support.
Signed-off-by: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9355/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/Kconfig')
| -rw-r--r-- | arch/mips/Kconfig | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index c7a16904cd03..69a3b0fab926 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -377,6 +377,7 @@ config MIPS_MALTA select SYS_HAS_CPU_MIPS32_R1 select SYS_HAS_CPU_MIPS32_R2 select SYS_HAS_CPU_MIPS32_R3_5 + select SYS_HAS_CPU_MIPS32_R5 select SYS_HAS_CPU_MIPS32_R6 select SYS_HAS_CPU_MIPS64_R1 select SYS_HAS_CPU_MIPS64_R2 @@ -386,6 +387,7 @@ config MIPS_MALTA select SYS_SUPPORTS_32BIT_KERNEL select SYS_SUPPORTS_64BIT_KERNEL select SYS_SUPPORTS_BIG_ENDIAN + select SYS_SUPPORTS_HIGHMEM select SYS_SUPPORTS_LITTLE_ENDIAN select SYS_SUPPORTS_MICROMIPS select SYS_SUPPORTS_MIPS_CMP @@ -1596,6 +1598,33 @@ config CPU_MIPS32_3_5_EVA One of its primary benefits is an increase in the maximum size of lowmem (up to 3GB). If unsure, say 'N' here. +config CPU_MIPS32_R5_FEATURES + bool "MIPS32 Release 5 Features" + depends on SYS_HAS_CPU_MIPS32_R5 + depends on CPU_MIPS32_R2 + help + Choose this option to build a kernel for release 2 or later of the + MIPS32 architecture including features from release 5 such as + support for Extended Physical Addressing (XPA). + +config CPU_MIPS32_R5_XPA + bool "Extended Physical Addressing (XPA)" + depends on CPU_MIPS32_R5_FEATURES + depends on !EVA + depends on !PAGE_SIZE_4KB + depends on SYS_SUPPORTS_HIGHMEM + select XPA + select HIGHMEM + select ARCH_PHYS_ADDR_T_64BIT + default n + help + Choose this option if you want to enable the Extended Physical + Addressing (XPA) on your MIPS32 core (such as P5600 series). The + benefit is to increase physical addressing equal to or greater + than 40 bits. Note that this has the side effect of turning on + 64-bit addressing which in turn makes the PTEs 64-bit in size. + If unsure, say 'N' here. + if CPU_LOONGSON2F config CPU_NOP_WORKAROUNDS bool @@ -1699,6 +1728,9 @@ config SYS_HAS_CPU_MIPS32_R2 config SYS_HAS_CPU_MIPS32_R3_5 bool +config SYS_HAS_CPU_MIPS32_R5 + bool + config SYS_HAS_CPU_MIPS32_R6 bool @@ -1836,6 +1868,9 @@ config CPU_MIPSR6 config EVA bool +config XPA + bool + config SYS_SUPPORTS_32BIT_KERNEL bool config SYS_SUPPORTS_64BIT_KERNEL |