[IA64] abstract SAL_CALL wrapper to allow other firmware entry points

SAL_CALL() always calls through the ia64_sal function pointer.  I am adding
new functionality that needs the same conventions as SAL_CALL (FP regs
saved/restored, sal_lock acquired, etc), but doesn't use the ia64_sal
function pointer.

This patch pulls the body of SAL_CALL out into a new "IA64_FW_CALL" that
takes care of these calling conventions, but allows the caller to specify
either ia64_sal or some other firmware entry point.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 9 insertions, 6 deletions

diff --git a/include/asm-ia64/sal.h b/include/asm-ia64/sal.h
index 46cadf5aaac5..1f5412d6f9bb 100644
--- a/include/asm-ia64/sal.h
+++ b/include/asm-ia64/sal.h
@@ -46,25 +46,28 @@
 extern spinlock_t sal_lock;
 
 /* SAL spec _requires_ eight args for each call. */
-#define __SAL_CALL(result,a0,a1,a2,a3,a4,a5,a6,a7)      \
-        result = (*ia64_sal)(a0,a1,a2,a3,a4,a5,a6,a7)
+#define __IA64_FW_CALL(entry,result,a0,a1,a2,a3,a4,a5,a6,a7)    \
+        result = (*entry)(a0,a1,a2,a3,a4,a5,a6,a7)
 
-# define SAL_CALL(result,args...) do {                          \
+# define IA64_FW_CALL(entry,result,args...) do {                \
         unsigned long __ia64_sc_flags;                          \
         struct ia64_fpreg __ia64_sc_fr[6];                      \
         ia64_save_scratch_fpregs(__ia64_sc_fr);                 \
         spin_lock_irqsave(&sal_lock, __ia64_sc_flags);          \
-        __SAL_CALL(result, args);                               \
+        __IA64_FW_CALL(entry, result, args);                    \
         spin_unlock_irqrestore(&sal_lock, __ia64_sc_flags);     \
         ia64_load_scratch_fpregs(__ia64_sc_fr);                 \
 } while (0)
 
+# define SAL_CALL(result,args...)                       \
+        IA64_FW_CALL(ia64_sal, result, args);
+
 # define SAL_CALL_NOLOCK(result,args...) do {           \
         unsigned long __ia64_scn_flags;                 \
         struct ia64_fpreg __ia64_scn_fr[6];             \
         ia64_save_scratch_fpregs(__ia64_scn_fr);        \
         local_irq_save(__ia64_scn_flags);               \
-        __SAL_CALL(result, args);                       \
+        __IA64_FW_CALL(ia64_sal, result, args);         \
         local_irq_restore(__ia64_scn_flags);            \
         ia64_load_scratch_fpregs(__ia64_scn_fr);        \
 } while (0)
@@ -73,7 +76,7 @@ extern spinlock_t sal_lock;
         struct ia64_fpreg __ia64_scs_fr[6];             \
         ia64_save_scratch_fpregs(__ia64_scs_fr);        \
         preempt_disable();                              \
-        __SAL_CALL(result, args);                       \
+        __IA64_FW_CALL(ia64_sal, result, args);         \
         preempt_enable();                               \
         ia64_load_scratch_fpregs(__ia64_scs_fr);        \
 } while (0)