Merge tag 'dma-mapping-5.4' of git://git.infradead.org/users/hch/dma-mapping

[linux-2.6-block.git] / arch / xtensa / Kconfig

diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index 70653aed300527b466325733d019c9b825192511..a8e7beb6b7b55b941c2a3b0d659ce386bfa11afc 100644 (file)
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -384,6 +384,54 @@ config FAST_SYSCALL_SPILL_REGISTERS
 
          If unsure, say N.
 
+config USER_ABI_CALL0
+       bool
+
+choice
+       prompt "Userspace ABI"
+       default USER_ABI_DEFAULT
+       help
+         Select supported userspace ABI.
+
+         If unsure, choose the default ABI.
+
+config USER_ABI_DEFAULT
+       bool "Default ABI only"
+       help
+         Assume default userspace ABI. For XEA2 cores it is windowed ABI.
+         call0 ABI binaries may be run on such kernel, but signal delivery
+         will not work correctly for them.
+
+config USER_ABI_CALL0_ONLY
+       bool "Call0 ABI only"
+       select USER_ABI_CALL0
+       help
+         Select this option to support only call0 ABI in userspace.
+         Windowed ABI binaries will crash with a segfault caused by
+         an illegal instruction exception on the first 'entry' opcode.
+
+         Choose this option if you're planning to run only user code
+         built with call0 ABI.
+
+config USER_ABI_CALL0_PROBE
+       bool "Support both windowed and call0 ABI by probing"
+       select USER_ABI_CALL0
+       help
+         Select this option to support both windowed and call0 userspace
+         ABIs. When enabled all processes are started with PS.WOE disabled
+         and a fast user exception handler for an illegal instruction is
+         used to turn on PS.WOE bit on the first 'entry' opcode executed by
+         the userspace.
+
+         This option should be enabled for the kernel that must support
+         both call0 and windowed ABIs in userspace at the same time.
+
+         Note that Xtensa ISA does not guarantee that entry opcode will
+         raise an illegal instruction exception on cores with XEA2 when
+         PS.WOE is disabled, check whether the target core supports it.
+
+endchoice
+
 endmenu
 
 config XTENSA_CALIBRATE_CCOUNT