[SeaBIOS] [PATCH 2/3] Convert virtio code to use GET/SET_LOWFLAT().

[Kevin O'Connor]

Convert from GET/SET_FLATPTR() to GET/SET_LOWFLAT() - the latter
produces better code.

Signed-off-by: Kevin O'Connor <kevin at koconnor.net>
---
 src/virtio-ring.c |   66 ++++++++++++++++++++++++++--------------------------
 1 files changed, 33 insertions(+), 33 deletions(-)

diff --git a/src/virtio-ring.c b/src/virtio-ring.c
index 97a3ffe..0883330 100644
--- a/src/virtio-ring.c
+++ b/src/virtio-ring.c
@@ -37,8 +37,8 @@
 
 int vring_more_used(struct vring_virtqueue *vq)
 {
-    struct vring_used *used = GET_FLATPTR(vq->vring.used);
-    int more = GET_FLATPTR(vq->last_used_idx) != GET_FLATPTR(used->idx);
+    struct vring_used *used = GET_LOWFLAT(vq->vring.used);
+    int more = GET_LOWFLAT(vq->last_used_idx) != GET_LOWFLAT(used->idx);
     /* Make sure ring reads are done after idx read above. */
     smp_rmb();
     return more;
@@ -53,19 +53,19 @@ int vring_more_used(struct vring_virtqueue *vq)
 void vring_detach(struct vring_virtqueue *vq, unsigned int head)
 {
     struct vring *vr = &vq->vring;
-    struct vring_desc *desc = GET_FLATPTR(vr->desc);
+    struct vring_desc *desc = GET_LOWFLAT(vr->desc);
     unsigned int i;
 
     /* find end of given descriptor */
 
     i = head;
-    while (GET_FLATPTR(desc[i].flags) & VRING_DESC_F_NEXT)
-        i = GET_FLATPTR(desc[i].next);
+    while (GET_LOWFLAT(desc[i].flags) & VRING_DESC_F_NEXT)
+        i = GET_LOWFLAT(desc[i].next);
 
     /* link it with free list and point to it */
 
-    SET_FLATPTR(desc[i].next, GET_FLATPTR(vq->free_head));
-    SET_FLATPTR(vq->free_head, head);
+    SET_LOWFLAT(desc[i].next, GET_LOWFLAT(vq->free_head));
+    SET_LOWFLAT(vq->free_head, head);
 }
 
 /*
@@ -79,22 +79,22 @@ int vring_get_buf(struct vring_virtqueue *vq, unsigned int *len)
 {
     struct vring *vr = &vq->vring;
     struct vring_used_elem *elem;
-    struct vring_used *used = GET_FLATPTR(vq->vring.used);
+    struct vring_used *used = GET_LOWFLAT(vq->vring.used);
     u32 id;
     int ret;
 
 //    BUG_ON(!vring_more_used(vq));
 
-    elem = &used->ring[GET_FLATPTR(vq->last_used_idx) % GET_FLATPTR(vr->num)];
-    id = GET_FLATPTR(elem->id);
+    elem = &used->ring[GET_LOWFLAT(vq->last_used_idx) % GET_LOWFLAT(vr->num)];
+    id = GET_LOWFLAT(elem->id);
     if (len != NULL)
-        *len = GET_FLATPTR(elem->len);
+        *len = GET_LOWFLAT(elem->len);
 
-    ret = GET_FLATPTR(vq->vdata[id]);
+    ret = GET_LOWFLAT(vq->vdata[id]);
 
     vring_detach(vq, id);
 
-    SET_FLATPTR(vq->last_used_idx, GET_FLATPTR(vq->last_used_idx) + 1);
+    SET_LOWFLAT(vq->last_used_idx, GET_LOWFLAT(vq->last_used_idx) + 1);
 
     return ret;
 }
@@ -106,46 +106,46 @@ void vring_add_buf(struct vring_virtqueue *vq,
 {
     struct vring *vr = &vq->vring;
     int i, av, head, prev;
-    struct vring_desc *desc = GET_FLATPTR(vr->desc);
-    struct vring_avail *avail = GET_FLATPTR(vr->avail);
+    struct vring_desc *desc = GET_LOWFLAT(vr->desc);
+    struct vring_avail *avail = GET_LOWFLAT(vr->avail);
 
     BUG_ON(out + in == 0);
 
     prev = 0;
-    head = GET_FLATPTR(vq->free_head);
-    for (i = head; out; i = GET_FLATPTR(desc[i].next), out--) {
-        SET_FLATPTR(desc[i].flags, VRING_DESC_F_NEXT);
-        SET_FLATPTR(desc[i].addr, (u64)virt_to_phys(list->addr));
-        SET_FLATPTR(desc[i].len, list->length);
+    head = GET_LOWFLAT(vq->free_head);
+    for (i = head; out; i = GET_LOWFLAT(desc[i].next), out--) {
+        SET_LOWFLAT(desc[i].flags, VRING_DESC_F_NEXT);
+        SET_LOWFLAT(desc[i].addr, (u64)virt_to_phys(list->addr));
+        SET_LOWFLAT(desc[i].len, list->length);
         prev = i;
         list++;
     }
-    for ( ; in; i = GET_FLATPTR(desc[i].next), in--) {
-        SET_FLATPTR(desc[i].flags, VRING_DESC_F_NEXT|VRING_DESC_F_WRITE);
-        SET_FLATPTR(desc[i].addr, (u64)virt_to_phys(list->addr));
-        SET_FLATPTR(desc[i].len, list->length);
+    for ( ; in; i = GET_LOWFLAT(desc[i].next), in--) {
+        SET_LOWFLAT(desc[i].flags, VRING_DESC_F_NEXT|VRING_DESC_F_WRITE);
+        SET_LOWFLAT(desc[i].addr, (u64)virt_to_phys(list->addr));
+        SET_LOWFLAT(desc[i].len, list->length);
         prev = i;
         list++;
     }
-    SET_FLATPTR(desc[prev].flags,
-                GET_FLATPTR(desc[prev].flags) & ~VRING_DESC_F_NEXT);
+    SET_LOWFLAT(desc[prev].flags,
+                GET_LOWFLAT(desc[prev].flags) & ~VRING_DESC_F_NEXT);
 
-    SET_FLATPTR(vq->free_head, i);
+    SET_LOWFLAT(vq->free_head, i);
 
-    SET_FLATPTR(vq->vdata[head], index);
+    SET_LOWFLAT(vq->vdata[head], index);
 
-    av = (GET_FLATPTR(avail->idx) + num_added) % GET_FLATPTR(vr->num);
-    SET_FLATPTR(avail->ring[av], head);
+    av = (GET_LOWFLAT(avail->idx) + num_added) % GET_LOWFLAT(vr->num);
+    SET_LOWFLAT(avail->ring[av], head);
 }
 
 void vring_kick(unsigned int ioaddr, struct vring_virtqueue *vq, int num_added)
 {
     struct vring *vr = &vq->vring;
-    struct vring_avail *avail = GET_FLATPTR(vr->avail);
+    struct vring_avail *avail = GET_LOWFLAT(vr->avail);
 
     /* Make sure idx update is done after ring write. */
     smp_wmb();
-    SET_FLATPTR(avail->idx, GET_FLATPTR(avail->idx) + num_added);
+    SET_LOWFLAT(avail->idx, GET_LOWFLAT(avail->idx) + num_added);
 
-    vp_notify(ioaddr, GET_FLATPTR(vq->queue_index));
+    vp_notify(ioaddr, GET_LOWFLAT(vq->queue_index));
 }
-- 
1.7.6.5