ppc4xx: Pass array index to function instead of pointer into the array

The sdram_set_bcr() function in ppc440_uc.c takes a pointer into an
array then calculates its index from that. It's simpler and easier to
just pass the index which simplifies both the function and its callers.
Do similar cleanup in ppc4xx_devs.c to similar function.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

2 files changed, 36 insertions, 44 deletions

diff --git a/hw/ppc/ppc440_uc.c b/hw/ppc/ppc440_uc.c
index e46f59f..60dbb35 100644
--- a/hw/ppc/ppc440_uc.c
+++ b/hw/ppc/ppc440_uc.c
@@ -564,28 +564,26 @@ static target_ulong sdram_size(uint32_t bcr)
     return size;
 }
 
-static void sdram_set_bcr(ppc440_sdram_t *sdram,
-                          uint32_t *bcrp, uint32_t bcr, int enabled)
+static void sdram_set_bcr(ppc440_sdram_t *sdram, int i,
+                          uint32_t bcr, int enabled)
 {
-    unsigned n = bcrp - sdram->bcr;
-
-    if (*bcrp & 1) {
-        /* Unmap RAM */
+    if (sdram->bcr[i] & 1) {
+        /* First unmap RAM if enabled */
         memory_region_del_subregion(get_system_memory(),
-                                    &sdram->containers[n]);
-        memory_region_del_subregion(&sdram->containers[n],
-                                    &sdram->ram_memories[n]);
-        object_unparent(OBJECT(&sdram->containers[n]));
+                                    &sdram->containers[i]);
+        memory_region_del_subregion(&sdram->containers[i],
+                                    &sdram->ram_memories[i]);
+        object_unparent(OBJECT(&sdram->containers[i]));
     }
-    *bcrp = bcr & 0xFFDEE001;
+    sdram->bcr[i] = bcr & 0xFFDEE001;
     if (enabled && (bcr & 1)) {
-        memory_region_init(&sdram->containers[n], NULL, "sdram-containers",
+        memory_region_init(&sdram->containers[i], NULL, "sdram-containers",
                            sdram_size(bcr));
-        memory_region_add_subregion(&sdram->containers[n], 0,
-                                    &sdram->ram_memories[n]);
+        memory_region_add_subregion(&sdram->containers[i], 0,
+                                    &sdram->ram_memories[i]);
         memory_region_add_subregion(get_system_memory(),
                                     sdram_base(bcr),
-                                    &sdram->containers[n]);
+                                    &sdram->containers[i]);
     }
 }
 
@@ -595,12 +593,10 @@ static void sdram_map_bcr(ppc440_sdram_t *sdram)
 
     for (i = 0; i < sdram->nbanks; i++) {
         if (sdram->ram_sizes[i] != 0) {
-            sdram_set_bcr(sdram,
-                          &sdram->bcr[i],
-                          sdram_bcr(sdram->ram_bases[i], sdram->ram_sizes[i]),
-                          1);
+            sdram_set_bcr(sdram, i, sdram_bcr(sdram->ram_bases[i],
+                                              sdram->ram_sizes[i]), 1);
         } else {
-            sdram_set_bcr(sdram, &sdram->bcr[i], 0, 0);
+            sdram_set_bcr(sdram, i, 0, 0);
         }
     }
 }
diff --git a/hw/ppc/ppc4xx_devs.c b/hw/ppc/ppc4xx_devs.c
index 9418478..fdfeb67 100644
--- a/hw/ppc/ppc4xx_devs.c
+++ b/hw/ppc/ppc4xx_devs.c
@@ -405,36 +405,34 @@ static target_ulong sdram_size (uint32_t bcr)
     return size;
 }
 
-static void sdram_set_bcr(ppc4xx_sdram_t *sdram,
-                          uint32_t *bcrp, uint32_t bcr, int enabled)
+static void sdram_set_bcr(ppc4xx_sdram_t *sdram, int i,
+                          uint32_t bcr, int enabled)
 {
-    unsigned n = bcrp - sdram->bcr;
-
-    if (*bcrp & 0x00000001) {
+    if (sdram->bcr[i] & 0x00000001) {
         /* Unmap RAM */
 #ifdef DEBUG_SDRAM
         printf("%s: unmap RAM area " TARGET_FMT_plx " " TARGET_FMT_lx "\n",
-               __func__, sdram_base(*bcrp), sdram_size(*bcrp));
+               __func__, sdram_base(sdram->bcr[i]), sdram_size(sdram->bcr[i]));
 #endif
         memory_region_del_subregion(get_system_memory(),
-                                    &sdram->containers[n]);
-        memory_region_del_subregion(&sdram->containers[n],
-                                    &sdram->ram_memories[n]);
-        object_unparent(OBJECT(&sdram->containers[n]));
+                                    &sdram->containers[i]);
+        memory_region_del_subregion(&sdram->containers[i],
+                                    &sdram->ram_memories[i]);
+        object_unparent(OBJECT(&sdram->containers[i]));
     }
-    *bcrp = bcr & 0xFFDEE001;
+    sdram->bcr[i] = bcr & 0xFFDEE001;
     if (enabled && (bcr & 0x00000001)) {
 #ifdef DEBUG_SDRAM
         printf("%s: Map RAM area " TARGET_FMT_plx " " TARGET_FMT_lx "\n",
                __func__, sdram_base(bcr), sdram_size(bcr));
 #endif
-        memory_region_init(&sdram->containers[n], NULL, "sdram-containers",
+        memory_region_init(&sdram->containers[i], NULL, "sdram-containers",
                            sdram_size(bcr));
-        memory_region_add_subregion(&sdram->containers[n], 0,
-                                    &sdram->ram_memories[n]);
+        memory_region_add_subregion(&sdram->containers[i], 0,
+                                    &sdram->ram_memories[i]);
         memory_region_add_subregion(get_system_memory(),
                                     sdram_base(bcr),
-                                    &sdram->containers[n]);
+                                    &sdram->containers[i]);
     }
 }
 
@@ -444,12 +442,10 @@ static void sdram_map_bcr (ppc4xx_sdram_t *sdram)
 
     for (i = 0; i < sdram->nbanks; i++) {
         if (sdram->ram_sizes[i] != 0) {
-            sdram_set_bcr(sdram,
-                          &sdram->bcr[i],
-                          sdram_bcr(sdram->ram_bases[i], sdram->ram_sizes[i]),
-                          1);
+            sdram_set_bcr(sdram, i, sdram_bcr(sdram->ram_bases[i],
+                                              sdram->ram_sizes[i]), 1);
         } else {
-            sdram_set_bcr(sdram, &sdram->bcr[i], 0x00000000, 0);
+            sdram_set_bcr(sdram, i, 0x00000000, 0);
         }
     }
 }
@@ -589,16 +585,16 @@ static void dcr_write_sdram (void *opaque, int dcrn, uint32_t val)
             sdram->pmit = (val & 0xF8000000) | 0x07C00000;
             break;
         case 0x40: /* SDRAM_B0CR */
-            sdram_set_bcr(sdram, &sdram->bcr[0], val, sdram->cfg & 0x80000000);
+            sdram_set_bcr(sdram, 0, val, sdram->cfg & 0x80000000);
             break;
         case 0x44: /* SDRAM_B1CR */
-            sdram_set_bcr(sdram, &sdram->bcr[1], val, sdram->cfg & 0x80000000);
+            sdram_set_bcr(sdram, 1, val, sdram->cfg & 0x80000000);
             break;
         case 0x48: /* SDRAM_B2CR */
-            sdram_set_bcr(sdram, &sdram->bcr[2], val, sdram->cfg & 0x80000000);
+            sdram_set_bcr(sdram, 2, val, sdram->cfg & 0x80000000);
             break;
         case 0x4C: /* SDRAM_B3CR */
-            sdram_set_bcr(sdram, &sdram->bcr[3], val, sdram->cfg & 0x80000000);
+            sdram_set_bcr(sdram, 3, val, sdram->cfg & 0x80000000);
             break;
         case 0x80: /* SDRAM_TR */
             sdram->tr = val & 0x018FC01F;