[XTENSA] Add support for configurable registers and coprocessors

The Xtensa architecture allows to define custom instructions and
registers. Registers that are bound to a coprocessor are only
accessible if the corresponding enable bit is set, which allows
to implement a 'lazy' context switch mechanism. Other registers
needs to be saved and restore at the time of the context switch
or during interrupt handling.

This patch adds support for these additional states:

- save and restore registers that are used by the compiler upon
  interrupt entry and exit.
- context switch additional registers unbound to any coprocessor
- 'lazy' context switch of registers bound to a coprocessor
- ptrace interface to provide access to additional registers
- update configuration files in include/asm-xtensa/variant-fsf

Signed-off-by: Chris Zankel <chris@zankel.net>

1 files changed, 21 insertions, 0 deletions

diff --git a/include/asm-xtensa/thread_info.h b/include/asm-xtensa/thread_info.h
index 52c958285bcb..a2c640682ed9 100644
--- a/include/asm-xtensa/thread_info.h
+++ b/include/asm-xtensa/thread_info.h
@@ -27,6 +27,21 @@
 
 #ifndef __ASSEMBLY__
 
+#if XTENSA_HAVE_COPROCESSORS
+
+typedef struct xtregs_coprocessor {
+        xtregs_cp0_t cp0;
+        xtregs_cp1_t cp1;
+        xtregs_cp2_t cp2;
+        xtregs_cp3_t cp3;
+        xtregs_cp4_t cp4;
+        xtregs_cp5_t cp5;
+        xtregs_cp6_t cp6;
+        xtregs_cp7_t cp7;
+} xtregs_coprocessor_t;
+
+#endif
+
 struct thread_info {
         struct task_struct      *task;          /* main task structure */
         struct exec_domain      *exec_domain;   /* execution domain */
@@ -38,7 +53,13 @@ struct thread_info {
         mm_segment_t            addr_limit;     /* thread address space */
         struct restart_block    restart_block;
 
+        unsigned long           cpenable;
 
+        /* Allocate storage for extra user states and coprocessor states. */
+#if XTENSA_HAVE_COPROCESSORS
+        xtregs_coprocessor_t    xtregs_cp;
+#endif
+        xtregs_user_t           xtregs_user;
 };
 
 #else /* !__ASSEMBLY__ */