[PR 13 v2] LEON3: make SHM driver configurable using weak

[Daniel Hellstrom]

Since the configuration struct is always present one can let
DATA initialize it to reduce footprint, at the same time it
is made weak to let the user able to configure the SHM driver
without editing the driver code.

Signed-off-by: Daniel Hellstrom <daniel at gaisler.com>
---
 c/src/lib/libbsp/sparc/leon3/shmsupp/getcfg.c |   22 +++++++++++++++++-----
 1 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/c/src/lib/libbsp/sparc/leon3/shmsupp/getcfg.c b/c/src/lib/libbsp/sparc/leon3/shmsupp/getcfg.c
index 3711777..f8edf11 100644
--- a/c/src/lib/libbsp/sparc/leon3/shmsupp/getcfg.c
+++ b/c/src/lib/libbsp/sparc/leon3/shmsupp/getcfg.c
@@ -76,8 +76,21 @@ extern rtems_mpci_entry Shm_Send_packet(
 #define INTERRUPT 0        /* XXX: */
 #define POLLING   1        /* XXX: fix me -- is polling ONLY!!! */
 
-
-shm_config_table BSP_shm_cfgtbl;
+/* Let user override this configuration by declaring this a weak variable */
+shm_config_table BSP_shm_cfgtbl __attribute__((weak)) =
+{
+  (vol_u32 *)0x40000000,    /* USER OVERRIDABLE */
+  0x00001000,               /* USER OVERRIDABLE */
+  SHM_BIG,
+  NULL_CONVERT,
+  INTR_MODE,
+  Shm_Cause_interrupt,
+  {
+    NULL,
+    1 << LEON3_MP_IRQ,      /* USER OVERRIDABLE */
+    4,
+  },
+};
 
 void Shm_Get_configuration(
   uint32_t   localnode,
@@ -88,8 +101,6 @@ void Shm_Get_configuration(
   int i;
   unsigned int tmp;
 
-  BSP_shm_cfgtbl.base         = 0x40000000;
-  BSP_shm_cfgtbl.length       = 0x00001000;
   BSP_shm_cfgtbl.format       = SHM_BIG;
 
   /*
@@ -108,7 +119,8 @@ void Shm_Get_configuration(
   BSP_shm_cfgtbl.poll_intr    = INTR_MODE;
   BSP_shm_cfgtbl.Intr.address =
      (vol_u32 *) &(LEON3_IrqCtrl_Regs->force[LEON3_Cpu_Index]);
-  BSP_shm_cfgtbl.Intr.value   = 1 << LEON3_MP_IRQ ;
+  if (BSP_shm_cfgtbl.Intr.value == 0)
+    BSP_shm_cfgtbl.Intr.value = 1 << LEON3_MP_IRQ; /* Use default MP-IRQ */
   BSP_shm_cfgtbl.Intr.length  = 4;
 
   if (LEON3_Cpu_Index == 0) {
-- 
1.7.0.4