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authorChris Zankel <chris@zankel.net>2008-02-12 13:17:07 -0800
committerChris Zankel <chris@zankel.net>2008-02-13 17:41:43 -0800
commitc658eac628aa8df040dfe614556d95e6da3a9ffb (patch)
treee2211e1d5c894c29e92d4c744f504b38410efe41 /include/asm-xtensa/thread_info.h
parent71d28e6c285548106f551fde13ca6d589433d843 (diff)
downloadop-kernel-dev-c658eac628aa8df040dfe614556d95e6da3a9ffb.zip
op-kernel-dev-c658eac628aa8df040dfe614556d95e6da3a9ffb.tar.gz
[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>
Diffstat (limited to 'include/asm-xtensa/thread_info.h')
-rw-r--r--include/asm-xtensa/thread_info.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/include/asm-xtensa/thread_info.h b/include/asm-xtensa/thread_info.h
index 52c9582..a2c6406 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__ */
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