#define RENDER_RING_BASE       0x02000
 #define BSD_RING_BASE          0x04000
 #define GEN6_BSD_RING_BASE     0x12000
-#define RING_TAIL(base)                (base)+0x30
-#define RING_HEAD(base)                (base)+0x34
-#define RING_START(base)       (base)+0x38
-#define RING_CTL(base)         (base)+0x3c
-#define RING_HWS_PGA(base)     (base)+0x80
+#define RING_TAIL(base)                ((base)+0x30)
+#define RING_HEAD(base)                ((base)+0x34)
+#define RING_START(base)       ((base)+0x38)
+#define RING_CTL(base)         ((base)+0x3c)
+#define RING_HWS_PGA(base)     ((base)+0x80)
+#define RING_HWS_PGA_GEN6(base)        ((base)+0x2080)
+#define RING_ACTHD(base)       ((base)+0x74)
 #define   TAIL_ADDR            0x001FFFF8
 #define   HEAD_WRAP_COUNT      0xFFE00000
 #define   HEAD_WRAP_ONE                0x00200000
 #define INSTDONE1      0x0207c /* 965+ only */
 #define ACTHD_I965     0x02074
 #define HWS_PGA                0x02080
-#define HWS_PGA_GEN6   0x04080
 #define HWS_ADDRESS_MASK       0xfffff000
 #define HWS_START_ADDRESS_SHIFT        4
 #define PWRCTXA                0x2088 /* 965GM+ only */
 #define   GEN6_BLITTER_COMMAND_PARSER_MASTER_ERROR     (1 << 25)
 #define   GEN6_BLITTER_SYNC_STATUS                     (1 << 24)
 #define   GEN6_BLITTER_USER_INTERRUPT                  (1 << 22)
-/*
- * BSD (bit stream decoder instruction and interrupt control register defines
- * (G4X and Ironlake only)
- */
-
-#define BSD_RING_TAIL          0x04030
-#define BSD_RING_HEAD          0x04034
-#define BSD_RING_START         0x04038
-#define BSD_RING_CTL           0x0403c
-#define BSD_RING_ACTHD         0x04074
-#define BSD_HWS_PGA            0x04080
-
-/*
- * video command stream instruction and interrupt control register defines
- * for GEN6
- */
-#define GEN6_BSD_RING_TAIL             0x12030
-#define GEN6_BSD_RING_HEAD             0x12034
-#define GEN6_BSD_RING_START            0x12038
-#define GEN6_BSD_RING_CTL              0x1203c
-#define GEN6_BSD_RING_ACTHD            0x12074
-#define GEN6_BSD_HWS_PGA               0x14080
 
 #define GEN6_BSD_SLEEP_PSMI_CONTROL    0x12050
 #define   GEN6_BSD_SLEEP_PSMI_CONTROL_RC_ILDL_MESSAGE_MODIFY_MASK      (1 << 16)
 
                                                struct intel_ring_buffer *ring)
 {
        drm_i915_private_t *dev_priv = dev->dev_private;
-       u32 acthd_reg = INTEL_INFO(dev)->gen >= 4 ? ACTHD_I965 : ACTHD;
+       u32 acthd_reg = INTEL_INFO(dev)->gen >= 4 ?
+                       RING_ACTHD(ring->mmio_base) : ACTHD;
 
        return I915_READ(acthd_reg);
 }
 {
        drm_i915_private_t *dev_priv = dev->dev_private;
        if (IS_GEN6(dev)) {
-               I915_WRITE(HWS_PGA_GEN6, ring->status_page.gfx_addr);
-               I915_READ(HWS_PGA_GEN6); /* posting read */
+               I915_WRITE(RING_HWS_PGA_GEN6(ring->mmio_base),
+                          ring->status_page.gfx_addr);
+               I915_READ(RING_HWS_PGA_GEN6(ring->mmio_base)); /* posting read */
        } else {
-               I915_WRITE(HWS_PGA, ring->status_page.gfx_addr);
-               I915_READ(HWS_PGA); /* posting read */
+               I915_WRITE(RING_HWS_PGA(ring->mmio_base),
+                          ring->status_page.gfx_addr);
+               I915_READ(RING_HWS_PGA(ring->mmio_base)); /* posting read */
        }
 
 }
                                             struct intel_ring_buffer *ring)
 {
        drm_i915_private_t *dev_priv = dev->dev_private;
-       return I915_READ(BSD_RING_ACTHD);
+       return I915_READ(RING_ACTHD(ring->mmio_base));
 }
 
 static int init_bsd_ring(struct drm_device *dev,
                                  struct  intel_ring_buffer *ring)
 {
        drm_i915_private_t *dev_priv = dev->dev_private;
-       I915_WRITE(BSD_HWS_PGA, ring->status_page.gfx_addr);
-       I915_READ(BSD_HWS_PGA);
+       I915_WRITE(RING_HWS_PGA(ring->mmio_base), ring->status_page.gfx_addr);
+       I915_READ(RING_HWS_PGA(ring->mmio_base));
 }
 
 static void
                                       struct  intel_ring_buffer *ring)
 {
        drm_i915_private_t *dev_priv = dev->dev_private;
-       I915_WRITE(GEN6_BSD_HWS_PGA, ring->status_page.gfx_addr);
-       I915_READ(GEN6_BSD_HWS_PGA);
+       I915_WRITE(RING_HWS_PGA_GEN6(ring->mmio_base), ring->status_page.gfx_addr);
+       I915_READ(RING_HWS_PGA_GEN6(ring->mmio_base));
 }
 
 static void gen6_bsd_ring_set_tail(struct drm_device *dev,
                                                  struct intel_ring_buffer *ring)
 {
        drm_i915_private_t *dev_priv = dev->dev_private;
-       return I915_READ(GEN6_BSD_RING_ACTHD);
+       return I915_READ(RING_ACTHD(ring->mmio_base));
 }
 
 static void gen6_bsd_ring_flush(struct drm_device *dev,