Secureboot memory layout support.

    * Start kernel in 1/4 cache mode per Secureboot.
    * Copy Secureboot header for base image for later use.
    * Blind-purge bottom half of cache.
    * Add bottom of cache into memory maps for 1/2 cache mode.

RTC: 64762
Change-Id: I1b45f30a2d45c9709d4fd486cfe0ca2ce86b051c
Reviewed-on: http://gfw160.austin.ibm.com:8080/gerrit/3773
Reviewed-by: Michael Baiocchi <baiocchi@us.ibm.com>
Tested-by: Jenkins Server
Reviewed-by: ADAM R. MUHLE <armuhle@us.ibm.com>
Reviewed-by: Daniel M. Crowell <dcrowell@us.ibm.com>
Reviewed-by: A. Patrick Williams III <iawillia@us.ibm.com>

1 files changed, 47 insertions, 0 deletions

diff --git a/src/kernel/misc.C b/src/kernel/misc.C
index e280a1527..6d7e866f6 100644
--- a/src/kernel/misc.C
+++ b/src/kernel/misc.C
@@ -314,6 +314,51 @@ namespace KernelMisc
         kassert(false);
     }
 
+    int expand_half_cache()
+    {
+        static bool executed = false;
+
+        if (executed) // Why are we being called a second time?
+        {
+            return -EFAULT;
+        }
+
+        uint64_t startAddr = 512*KILOBYTE;
+        uint64_t endAddr = 1*MEGABYTE;
+
+        size_t cache_columns = 0;
+
+        switch(CpuID::getCpuType())
+        {
+            case CORE_POWER8_MURANO:
+            case CORE_POWER8_VENICE:
+                cache_columns = 4;
+                break;
+
+            default:
+                kassert(false);
+                break;
+        }
+
+        for (size_t i = 0; i < cache_columns; i++)
+        {
+            size_t offset = i * MEGABYTE;
+            populate_cache_lines(
+                reinterpret_cast<uint64_t*>(startAddr + offset),
+                reinterpret_cast<uint64_t*>(endAddr + offset));
+
+            PageManager::addMemory(startAddr + offset,
+                                   (512*KILOBYTE)/PAGESIZE);
+        }
+
+        executed = true;
+
+        KernelMemState::setMemScratchReg(KernelMemState::MEM_CONTAINED_L3,
+                                         KernelMemState::HALF_CACHE);
+
+        return 0;
+    }
+
     int expand_full_cache()
     {
         static bool executed = false;
@@ -334,8 +379,10 @@ namespace KernelMisc
                                          ( VmmManager::INITIAL_MEM_SIZE ) ;
                 endAddr =
                     reinterpret_cast<uint64_t*>(8 * MEGABYTE);
+                break;
 
             default:
+                kassert(false);
                 break;
         }