Patch from John Cotton <john.cotton@nrc.ca>, Charles-Antoine Gauthier

<charles.gauthier@iit.nrc.ca>, and Darlene A. Stewart
<Darlene.Stewart@nrc.ca> to add support for a number of very
significant things:

  + BSPs for many variations on the Motorola MBX8xx board series
  + Cache Manager including initial support for m68040
    and PowerPC
  + Rework of mpc8xx libcpu code so all mpc8xx CPUs now use
    same code base.
  + Rework of eth_comm BSP to utiltize above.

John reports this works on the 821 and 860

1 files changed, 89 insertions, 0 deletions

diff --git a/c/src/lib/libcpu/powerpc/mpc8xx/cpm/dpram.c b/c/src/lib/libcpu/powerpc/mpc8xx/cpm/dpram.c
new file mode 100644
index 0000000000..985b5b5bd1
--- /dev/null
+++ b/c/src/lib/libcpu/powerpc/mpc8xx/cpm/dpram.c
@@ -0,0 +1,89 @@
+/*
+ * dpram.c
+ *
+ * MPC8xx dual-port RAM allocation routines
+ * 
+ * Based on code (alloc860.c in eth_comm port) by
+ * Jay Monkman (jmonkman@frasca.com),
+ * which, in turn, is based on code by
+ * W. Eric Norum (eric@skatter.usask.ca).
+ *
+ *
+ * Modifications :
+ * Copyright (c) 1999, National Research Council of Canada
+ */
+
+#include <bsp.h>
+#include <rtems/rtems/intr.h>
+#include <rtems/error.h>
+
+/*
+ * Allocation order:
+ *      - Dual-Port RAM section 0
+ *      - Dual-Port RAM section 1
+ *      - Dual-Port RAM section 2
+ *      - Dual-Port RAM section 3
+ *      - Dual-Port RAM section 4
+ */
+static struct {
+  unsigned8     *base;
+  unsigned int  size;
+  unsigned int  used;
+} dpram_regions[] = {
+  { (char *)&m8xx.dpram0[0],    sizeof m8xx.dpram0,     0 },
+  { (char *)&m8xx.dpram1[0],    sizeof m8xx.dpram1,     0 },
+  { (char *)&m8xx.dpram2[0],    sizeof m8xx.dpram2,     0 },
+  { (char *)&m8xx.dpram3[0],    sizeof m8xx.dpram3,     0 },
+  { (char *)&m8xx.dpram4[0],    sizeof m8xx.dpram4,     0 },
+};
+
+#define	NUM_DPRAM_REGIONS	(sizeof(dpram_regions) / sizeof(dpram_regions[0]))
+
+void *
+m8xx_dpram_allocate( unsigned int byte_count )
+{
+  unsigned int i;
+  ISR_Level level;
+  void *blockp = NULL;
+  
+  byte_count = (byte_count + 3) & ~0x3;
+  
+  /*
+   * Running with interrupts disabled is usually considered bad
+   * form, but this routine is probably being run as part of an
+   * initialization sequence so the effect shouldn't be too severe.
+   */
+  _ISR_Disable (level);
+  
+  for ( i = 0; i < NUM_DPRAM_REGIONS; i++ ) {
+    /*
+     * Verify that the region is available for use.
+     * This test is necessary because if extra microcode modules
+     * are installed, some regions are locked and unavailable.
+     * See MPC860 User's Manual Pages 19-9 to 19-11.
+     */
+    if (dpram_regions[i].used == 0) {
+      volatile unsigned char *cp = dpram_regions[i].base;
+      *cp = 0xAA;
+      if (*cp != 0xAA)
+        dpram_regions[i].used = dpram_regions[i].size;
+      else {
+        *cp = 0x55;
+        if (*cp != 0x55)
+          dpram_regions[i].used = dpram_regions[i].size;
+      }
+      *cp = 0x0;
+    }
+    if (dpram_regions[i].size - dpram_regions[i].used >= byte_count) {
+      blockp = dpram_regions[i].base + dpram_regions[i].used;
+      dpram_regions[i].used += byte_count;
+      break;
+    }
+  }
+  
+  _ISR_Enable(level);
+  
+  if (blockp == NULL)
+    rtems_panic("Can't allocate %d bytes of dual-port RAM.\n", byte_count);
+  return blockp;
+}