xtensa: use register window specific opcodes only when present

xtensa core may be configured without register windows support, don't
use register window specific opcodes in that case. Use window register
specific opcodes to initialize hardware or reset core to a known state
regardless of the chosen ABI.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

diff --git a/arch/xtensa/boot/boot-elf/bootstrap.S b/arch/xtensa/boot/boot-elf/bootstrap.S
index 99e98c9bae419a84774aa488d4d30a75017eba11..2dd28931d6990a1d1874e7b03e9de2776ae33f8c 100644 (file)
--- a/arch/xtensa/boot/boot-elf/bootstrap.S
+++ b/arch/xtensa/boot/boot-elf/bootstrap.S
@@ -42,12 +42,14 @@ _bootparam:
 
        .align  4
 _SetupMMU:
+#if XCHAL_HAVE_WINDOWED
        movi    a0, 0
        wsr     a0, windowbase
        rsync
        movi    a0, 1
        wsr     a0, windowstart
        rsync
+#endif
        movi    a0, 0x1F
        wsr     a0, ps
        rsync

diff --git a/arch/xtensa/boot/boot-redboot/bootstrap.S b/arch/xtensa/boot/boot-redboot/bootstrap.S
index 51e8f3b88e82a0d79426691dd30b84f9a05a723c..3ed94ad3500076c52bcdd8b65806782da81bf013 100644 (file)
--- a/arch/xtensa/boot/boot-redboot/bootstrap.S
+++ b/arch/xtensa/boot/boot-redboot/bootstrap.S
@@ -56,13 +56,13 @@ _start:
        movi    a4, 1
        wsr     a4, ps
        rsync
-
+#if XCHAL_HAVE_WINDOWED
        rsr     a5, windowbase
        ssl     a5
        sll     a4, a4
        wsr     a4, windowstart
        rsync
-
+#endif
        movi    a4, KERNEL_PS_WOE_MASK
        wsr     a4, ps
        rsync

diff --git a/arch/xtensa/kernel/align.S b/arch/xtensa/kernel/align.S
index 9301452e521ed7c9752d0a29e0276a90fe8135a0..d062c732ef1864c9eab5730a86682c62a9bb1b3a 100644 (file)
--- a/arch/xtensa/kernel/align.S
+++ b/arch/xtensa/kernel/align.S
@@ -58,7 +58,9 @@
  *  BE  shift left / mask 0 0 X X
  */
 
+#if XCHAL_HAVE_WINDOWED
 #define UNALIGNED_USER_EXCEPTION
+#endif
 
 #if XCHAL_HAVE_BE
 

diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S
index a144b467c3fdcec0f46c1c85f300cfaf6a7f65b7..8029ce24af925eb666b7bc7070ef39b213bbfc9b 100644 (file)
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -940,12 +940,14 @@ unrecoverable_text:
 
 ENTRY(unrecoverable_exception)
 
+#if XCHAL_HAVE_WINDOWED
        movi    a0, 1
        movi    a1, 0
 
        wsr     a0, windowstart
        wsr     a1, windowbase
        rsync
+#endif
 
        movi    a1, KERNEL_PS_WOE_MASK | LOCKLEVEL
        wsr     a1, ps

diff --git a/arch/xtensa/kernel/head.S b/arch/xtensa/kernel/head.S
index 8972d64e0b861d16c43ee6f38f42860ea883006a..8484294bc623f03c8a427aa290402927a8d5517a 100644 (file)
--- a/arch/xtensa/kernel/head.S
+++ b/arch/xtensa/kernel/head.S
@@ -67,11 +67,13 @@ _SetupOCD:
         * xt-gdb to single step via DEBUG exceptions received directly
         * by ocd.
         */
+#if XCHAL_HAVE_WINDOWED
        movi    a1, 1
        movi    a0, 0
        wsr     a1, windowstart
        wsr     a0, windowbase
        rsync
+#endif
 
        movi    a1, LOCKLEVEL
        wsr     a1, ps