Changeset 459 for trunk/hal/tsar_mips32/core/hal_special.c

Timestamp:

Aug 13, 2018, 1:43:20 PM (6 years ago)

Author:

alain

Message:

Introduce the math library, to support the floating point
data used by the multi-thread fft application.
Fix several bugs regarding the FPU context save/restore.
Introduce support for the %f format in printf.

File:

• trunk/hal/tsar_mips32/core/hal_special.c (modified) (4 diffs)

trunk/hal/tsar_mips32/core/hal_special.c

@@ -113 +113 @@
 void hal_fpu_enable()
 {
+    // set CU1 bit (FPU enable) in c0_sr
         asm volatile 
         ( ".set noat                         \n"
@@ -120 +121 @@
       "mtc0   $27,    $12                \n"
       ".set at                           \n" );
+
+    // set CU1 bit in calling thread UZONE
+    uint32_t * uzone = CURRENT_THREAD->uzone_current;
+    uzone[34] |= 0x20000000;
 }
 
@@ -125 +130 @@
 void hal_fpu_disable()
 {
+    // reset CU1 bit (FPU enable) in c0_sr
         asm volatile 
         ( ".set noat                         \n"
@@ -133 +139 @@
       "mtc0   $27,    $12                \n"
           ".set at                           \n");
+
+    // reset CU1 bit in calling thread UZONE
+    uint32_t * uzone = CURRENT_THREAD->uzone_current;
+    uzone[34] &= 0xDFFFFFFF;
 }