[rtems commit] PR 2015 - LEON3: make SHM driver configurable using weak symbols

[Joel Sherrill]

Module:    rtems
Branch:    4.10
Commit:    3f85deb858cde2c0ab50007e84c4980f4fcc53ca
Changeset: http://git.rtems.org/rtems/commit/?id=3f85deb858cde2c0ab50007e84c4980f4fcc53ca

Author:    Joel Sherrill <joel.sherrill at oarcorp.com>
Date:      Fri Feb 17 14:25:13 2012 -0600

PR 2015 - LEON3: make SHM driver configurable using weak symbols

PR 2015/bsps

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/ChangeLog        |    5 +++++
 c/src/lib/libbsp/sparc/leon3/shmsupp/getcfg.c |   22 +++++++++++++++++-----
 2 files changed, 22 insertions(+), 5 deletions(-)

diff --git a/c/src/lib/libbsp/sparc/leon3/ChangeLog b/c/src/lib/libbsp/sparc/leon3/ChangeLog
index b5a0069..c9bc804 100644
--- a/c/src/lib/libbsp/sparc/leon3/ChangeLog
+++ b/c/src/lib/libbsp/sparc/leon3/ChangeLog
@@ -1,3 +1,8 @@
+2012-02-17	Daniel Hellstrom <daniel at gaisler.com>
+
+	PR 2015/bsps
+	* shmsupp/getcfg.c: Make SHM driver configurable using weak symbol.
+
 2011-04-25	Jennifer Averett <jennifer.averett at OARcorp.com>
 
 	PR 1783/bsps
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) {