commit 3386376c04533288ff51d8f3a6f0fba77af4d209
author Artyom Tarasenko <atar4qemu@googlemail.com> Sat May 08 16:10:14 2010 +0200
committer Blue Swirl <blauwirbel@gmail.com> Sat May 29 08:20:55 2010 +0000
tree 1b57bd6075fbcb1d6ca7a6979c32f4cf4bb9a922
parent 54a3c0f032abf93d1cedc75456af75401ac10360

Pad iommu with an empty slot (necessary for SunOS 4.1.4)

On the real hardware (SS-5, LX) the MMU is not padded, but aliased.
Software shouldn't use aliased addresses, neither should it crash
when it uses (on the real hardware it wouldn't). Using empty_slot
instead of aliasing can help with debugging such accesses.

Signed-off-by: Artyom Tarasenko <atar4qemu@googlemail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

hw/sun4m.c

diff --git a/hw/sun4m.c b/hw/sun4m.c
index 7ba0f76..e4ca8f3 100644
--- a/hw/sun4m.c
+++ b/hw/sun4m.c
@@ -93,7 +93,7 @@
 #define ESCC_CLOCK 4915200
 
 struct sun4m_hwdef {
-    target_phys_addr_t iommu_base, slavio_base;
+    target_phys_addr_t iommu_base, iommu_pad_base, iommu_pad_len, slavio_base;
     target_phys_addr_t intctl_base, counter_base, nvram_base, ms_kb_base;
     target_phys_addr_t serial_base, fd_base;
     target_phys_addr_t afx_base, idreg_base, dma_base, esp_base, le_base;
@@ -854,6 +854,14 @@
     iommu = iommu_init(hwdef->iommu_base, hwdef->iommu_version,
                        slavio_irq[30]);
 
+    if (hwdef->iommu_pad_base) {
+        /* On the real hardware (SS-5, LX) the MMU is not padded, but aliased.
+           Software shouldn't use aliased addresses, neither should it crash
+           when does. Using empty_slot instead of aliasing can help with
+           debugging such accesses */
+        empty_slot_init(hwdef->iommu_pad_base,hwdef->iommu_pad_len);
+    }
+
     espdma = sparc32_dma_init(hwdef->dma_base, slavio_irq[18],
                               iommu, &espdma_irq);
 
@@ -965,6 +973,8 @@
     /* SS-5 */
     {
         .iommu_base   = 0x10000000,
+        .iommu_pad_base = 0x10004000,
+        .iommu_pad_len  = 0x0fffb000,
         .tcx_base     = 0x50000000,
         .cs_base      = 0x6c000000,
         .slavio_base  = 0x70000000,
@@ -1091,6 +1101,8 @@
     /* LX */
     {
         .iommu_base   = 0x10000000,
+        .iommu_pad_base = 0x10004000,
+        .iommu_pad_len  = 0x0fffb000,
         .tcx_base     = 0x50000000,
         .slavio_base  = 0x70000000,
         .ms_kb_base   = 0x71000000,