AMD Fam10 code breaks with gcc 4.5.0.

Root cause: After function STOP_CAR_AND_CPU disables cache as
ram, the cache as ram stack can no longer be used. Called
functions must be inlined to avoid stack usage. Also, the
compiler must keep local variables register based and not
allocated them from the stack. With gcc 4.5.0, some functions
declared as inline are not being inlined. This patch forces
these functions to always be inlined by adding the qualifier
__attribute__((always_inline)) to their declaration.

Signed-off-by: Scott Duplichan <scott@notabs.org>
Acked-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Marc Jones <marcj303@gmail.com>
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5818 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

diff --git a/src/include/cpu/x86/cache.h b/src/include/cpu/x86/cache.h
index 65979fff772c5152c2dda88b166c1f2829701413..a473d66c8fa96e2e701403f6a8aec5a8a526008a 100644 (file)
--- a/src/include/cpu/x86/cache.h
+++ b/src/include/cpu/x86/cache.h
@@ -74,7 +74,17 @@ static inline void invd(void)
        asm volatile("invd" ::: "memory");
 }
 
-static inline void enable_cache(void)
+/* The following functions require the always_inline due to AMD
+ * function STOP_CAR_AND_CPU that disables cache as
+ * ram, the cache as ram stack can no longer be used. Called
+ * functions must be inlined to avoid stack usage. Also, the
+ * compiler must keep local variables register based and not
+ * allocated them from the stack. With gcc 4.5.0, some functions
+ * declared as inline are not being inlined. This patch forces
+ * these functions to always be inlined by adding the qualifier
+ * __attribute__((always_inline)) to their declaration.
+ */
+static inline __attribute__((always_inline)) void enable_cache(void)
 {
        unsigned long cr0;
        cr0 = read_cr0();
@@ -82,7 +92,7 @@ static inline void enable_cache(void)
        write_cr0(cr0);
 }
 
-static inline void disable_cache(void)
+static inline __attribute__((always_inline)) void disable_cache(void)
 {
        /* Disable and write back the cache */
        unsigned long cr0;

diff --git a/src/include/cpu/x86/msr.h b/src/include/cpu/x86/msr.h
index a201ef42f2ab7033618680fb6c9a3262c5dd57e2..e8bc195307ecf52aee2f696b7225ae16c657c5ca 100644 (file)
--- a/src/include/cpu/x86/msr.h
+++ b/src/include/cpu/x86/msr.h
@@ -29,7 +29,17 @@ typedef struct msrinit_struct
         msr_t msr;
 } msrinit_t;
 
-static inline msr_t rdmsr(unsigned index)
+/* The following functions require the always_inline due to AMD
+ * function STOP_CAR_AND_CPU that disables cache as
+ * ram, the cache as ram stack can no longer be used. Called
+ * functions must be inlined to avoid stack usage. Also, the
+ * compiler must keep local variables register based and not
+ * allocated them from the stack. With gcc 4.5.0, some functions
+ * declared as inline are not being inlined. This patch forces
+ * these functions to always be inlined by adding the qualifier
+ * __attribute__((always_inline)) to their declaration.
+ */
+static inline __attribute__((always_inline)) msr_t rdmsr(unsigned index)
 {
        msr_t result;
        __asm__ __volatile__ (
@@ -40,7 +50,7 @@ static inline msr_t rdmsr(unsigned index)
        return result;
 }
 
-static inline void wrmsr(unsigned index, msr_t msr)
+static inline __attribute__((always_inline)) void wrmsr(unsigned index, msr_t msr)
 {
        __asm__ __volatile__ (
                "wrmsr"