Changeset 8dcbc16b in rtems

Timestamp:

02/18/99 21:41:59 (25 years ago)

Author:

Joel Sherrill <joel.sherrill@…>

Branches:

4.10, 4.11, 4.8, 4.9, 5, master

Children:

a53a2bf7

Parents:

c0438add

Message:

Patch from Ian Lance Taylor <ian@…>:

Here is a patch which slightly improves the i386 interrupt handling
macros. These macros were written to use both input and output
parameters, which is not necessary. This patch changes them to use
only an input or output parameter, as appropriate. It also changes
the constraints to permit the interrupt level to be loaded directly in
and out of memory, rather than always requiring a register.

File:

• c/src/lib/libcpu/i386/cpu.h (modified) (4 diffs)

c/src/lib/libcpu/i386/cpu.h

@@ -37 +37 @@
                     cli ; \
                     pop %0" \
-                    : "=r" ((_level)) : "0" ((_level)) \
+                   : "=rm" ((_level)) \
     ); \
   }
@@ -45 +45 @@
     asm volatile ( "push %0 ; \
                     popf" \
-                    : "=r" ((_level)) : "0" ((_level)) \
+                    : "=rm" ((_level)) \
     ); \
   }
@@ -54 +54 @@
                     popf ; \
                     cli" \
-                    : "=r" ((_level)) : "0" ((_level)) \
+                    : "=rm" ((_level)) \
     ); \
   }
@@ -60 +60 @@
 #define i386_get_interrupt_level( _level ) \
   do { \
-    register unsigned32 _eflags = 0; \
+    register unsigned32 _eflags; \
     \
     asm volatile ( "pushf ; \
                     pop %0" \
-                    : "=r" ((_eflags)) : "0" ((_eflags)) \
+                    : "=rm" ((_eflags)) \
     ); \
     \
-    _level = (_eflags &  EFLAGS_INTR_ENABLE) ? 0 : 1; \
+    _level = (_eflags & EFLAGS_INTR_ENABLE) ? 0 : 1; \
   } while (0)