Changeset 957ce9a5 in mainline

Timestamp:

2012-11-24T23:22:33Z (12 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

e5c8bc6

Parents:

65871bb

Message:

arm32: Implement and allow lazy FPU context switching.

It's horribly slow and gui fails to draw things properly.

Files:

• HelenOS.config (modified) (1 diff)
• kernel/arch/arm32/src/exception.c (modified) (2 diffs)
• kernel/arch/arm32/src/fpu_context.c (modified) (1 diff)

HelenOS.config

@@ -367 +367 @@
 
 % Lazy FPU context switching
-! [CONFIG_FPU=y&PLATFORM!=arm32] CONFIG_FPU_LAZY (y/n)
+! [CONFIG_FPU=y] CONFIG_FPU_LAZY (y/n)
 
 % Use VHPT

kernel/arch/arm32/src/exception.c

@@ -161 +161 @@
 }
 
+/** Undefined instruction exception handler.
+ *
+ * Calls scheduler_fpu_lazy_request
+ */
+static void undef_insn_exception(unsigned int exc_no, istate_t *istate)
+{
+#ifdef CONFIG_FPU_LAZY
+        scheduler_fpu_lazy_request();
+#else
+        fault_if_from_uspace(istate, "Undefined instruction.");
+        panic_badtrap(istate, exc_no, "Undefined instruction.");
+#endif
+}
+
 /** Initializes exception handling.
  *
@@ -174 +188 @@
         install_exception_handlers();
         
+        exc_register(EXC_UNDEF_INSTR, "undefined instruction", true,
+            (iroutine_t) undef_insn_exception);
         exc_register(EXC_IRQ, "interrupt", true,
             (iroutine_t) irq_exception);

kernel/arch/arm32/src/fpu_context.c

@@ -143 +143 @@
 void fpu_init(void)
 {
+        fpu_enable();
 }