[Qemu-devel] [PATCH 1/2] apb: add implementation of UltraSPARC IIi PCI TAS register

[Mark Cave-Ayland]

FreeBSD SPARC64 checks the value of this register on boot in order to calculate
the DVMA base address.

Signed-off-by: Mark Cave-Ayland <address@hidden>
---
 hw/pci-host/apb.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/hw/pci-host/apb.c b/hw/pci-host/apb.c
index 60bd81e..3b7fb13 100644
--- a/hw/pci-host/apb.c
+++ b/hw/pci-host/apb.c
@@ -68,6 +68,11 @@ do { printf("IOMMU: " fmt , ## __VA_ARGS__); } while (0)
 #define PBM_PCI_IMR_MASK    0x7fffffff
 #define PBM_PCI_IMR_ENABLED 0x80000000
 
+/* PCI Target Address Space Register (see UltraSPARC IIi User's Manual
+   section 19.3.0.4) */
+#define PBM_PCI_TARGET_AS              0x2028
+#define PBM_PCI_TARGET_AS_CD_ENABLE    0x40
+
 #define POR          (1U << 31)
 #define SOFT_POR     (1U << 30)
 #define SOFT_XIR     (1U << 29)
@@ -731,6 +736,12 @@ static void pci_pbm_reset(DeviceState *d)
     s->irq_request = NO_IRQ_REQUEST;
     s->pci_irq_in = 0ULL;
 
+    /* Set target address space register to base 0xc0000000, size 0x20000000
+       to match OpenBIOS virtual-dma properties */
+    s->pci_control[((PBM_PCI_TARGET_AS & 0x3f) >> 2)] = 0x0;
+    s->pci_control[((PBM_PCI_TARGET_AS & 0x3f) >> 2) + 1] =
+            PBM_PCI_TARGET_AS_CD_ENABLE;
+
     if (s->nr_resets++ == 0) {
         /* Power on reset */
         s->reset_control = POR;
-- 
1.7.10.4