ARM: Better RealView/Versatile EB platform support.

Add registers and components to better support the VersatileEB board.
Made the MIDR and SYS_ID register parameters to ArmSystem and RealviewCtrl
respectively.

src/arch/arm/ArmSystem.py

@@ -46,6 +46,12 @@ class ArmMachineType(Enum):
 class ArmSystem(System):
     type = 'ArmSystem'
     load_addr_mask = 0xffffffff
+    # 0x35 Implementor is '5' from "M5"
+    # 0x0 Variant
+    # 0xf Architecture from CPUID scheme
+    # 0xf00 Primary part number
+    # 0x0 Revision
+    midr_regval = Param.UInt32(0x350ff000, "MIDR value")
     boot_loader = Param.String("", "File that contains the boot loader code if any")
     boot_loader_mem = Param.PhysicalMemory(NULL,
                           "Memory object that boot loader is to be loaded into")

src/arch/arm/isa.cc

@@ -52,7 +52,7 @@ void
 ISA::clear()
 {
     SCTLR sctlr_rst = miscRegs[MISCREG_SCTLR_RST];
-
+    uint32_t midr = miscRegs[MISCREG_MIDR];
     memset(miscRegs, 0, sizeof(miscRegs));
     CPSR cpsr = 0;
     cpsr.mode = MODE_USER;
@@ -71,21 +71,12 @@ ISA::clear()
     miscRegs[MISCREG_SCTLR] = sctlr;
     miscRegs[MISCREG_SCTLR_RST] = sctlr_rst;
 
+    // Preserve MIDR accross reset
+    miscRegs[MISCREG_MIDR] = midr;
+
     /* Start with an event in the mailbox */
     miscRegs[MISCREG_SEV_MAILBOX] = 1;
 
-    /*
-     * Implemented = '5' from "M5",
-     * Variant = 0,
-     */
-    miscRegs[MISCREG_MIDR] =
-        (0x35 << 24) | // Implementor is '5' from "M5"
-        (0 << 20)    | // Variant
-        (0xf << 16)  | // Architecture from CPUID scheme
-        (0xf00 << 4) | // Primary part number
-        (0 << 0)     | // Revision
-        0;
-
     // Separate Instruction and Data TLBs.
     miscRegs[MISCREG_TLBTR] = 1;
 
@@ -209,6 +200,9 @@ ISA::readMiscReg(int misc_reg, ThreadContext *tc)
         warn("Returning thumbEE disabled for now since we don't support CP14"
              "config registers and jumping to ThumbEE vectors\n");
         return 0x0031; // !ThumbEE | !Jazelle | Thumb | ARM
+      case MISCREG_ID_PFR1:
+        warn("reading unimplmented register ID_PFR1");
+        return 0;
       case MISCREG_ID_MMFR0:
         return 0x03; //VMSAz7
       case MISCREG_CTR:
@@ -219,7 +213,7 @@ ISA::readMiscReg(int misc_reg, ThreadContext *tc)
       case MISCREG_PMCR:
       case MISCREG_PMCCNTR:
       case MISCREG_PMSELR:
-        warn("Not doing anyhting for read to miscreg %s\n",
+        warn("Not doing anything for read to miscreg %s\n",
                 miscRegName[misc_reg]);
         break;
       case MISCREG_FPSCR_QC:

src/arch/arm/miscregs.hh

@@ -174,9 +174,9 @@ namespace ArmISA
         MISCREG_CPSR_MODE,
         MISCREG_LOCKFLAG,
         MISCREG_LOCKADDR,
+        MISCREG_ID_PFR1,
         MISCREG_CP15_UNIMP_START,
         MISCREG_TCMTR = MISCREG_CP15_UNIMP_START,
-        MISCREG_ID_PFR1,
         MISCREG_ID_DFR0,
         MISCREG_ID_AFR0,
         MISCREG_ID_MMFR1,
@@ -236,10 +236,10 @@ namespace ArmISA
         "pmceid1", "pmc_other", "pmxevcntr",
         "pmuserenr", "pmintenset", "pmintenclr",
         "id_isar0", "id_isar1", "id_isar2", "id_isar3", "id_isar4", "id_isar5",
-        "cpsr_mode", "lockflag", "lockaddr",
+        "cpsr_mode", "lockflag", "lockaddr", "id_pfr1",
          // Unimplemented below
         "tcmtr",
-        "id_pfr1", "id_dfr0", "id_afr0",
+        "id_dfr0", "id_afr0",
         "id_mmfr1", "id_mmfr2",
         "aidr", "adfsr", "aifsr",
         "dcimvac", "dcisw", "mccsw",

src/arch/arm/system.cc

@@ -104,6 +104,13 @@ ArmSystem::initState()
         // Set the initial PC to be at start of the kernel code
         threadContexts[0]->pcState(kernelEntry & loadAddrMask);
     }
+    for (int i = 0; i < threadContexts.size(); i++) {
+        if (params()->midr_regval) {
+            threadContexts[i]->setMiscReg(ArmISA::MISCREG_MIDR,
+                    params()->midr_regval);
+        }
+    }
+
 }
 
 ArmSystem::~ArmSystem()

src/arch/arm/tlb.hh

@@ -236,6 +236,11 @@ protected:
         miscRegValid = true;
     }
 public:
+    const Params *
+    params() const
+    {
+        return dynamic_cast<const Params *>(_params);
+    }
     inline void invalidateMiscReg() { miscRegValid = false; }
 };
 

src/dev/arm/RealView.py

@@ -75,7 +75,8 @@ class A9SCU(BasicPioDevice):
 
 class RealViewCtrl(BasicPioDevice):
     type = 'RealViewCtrl'
-    proc_id = Param.UInt32(0x0C000000, "Platform ID")
+    proc_id = Param.UInt32(0x0C000000, "Processor ID, SYS_PROCID")
+    idreg = Param.UInt32(0x00000000, "ID Register, SYS_ID")
 
 class Gic(PioDevice):
     type = 'Gic'
@@ -145,7 +146,7 @@ class RealViewPBX(RealView):
 
 
     l2x0_fake     = IsaFake(pio_addr=0x1f002000, pio_size=0xfff)
-    flash_fake    = IsaFake(pio_addr=0x40000000, pio_size=0x4000000)
+    flash_fake    = IsaFake(pio_addr=0x40000000, pio_size=0x20000000)
     dmac_fake     = AmbaFake(pio_addr=0x10030000)
     uart1_fake    = AmbaFake(pio_addr=0x1000a000)
     uart2_fake    = AmbaFake(pio_addr=0x1000b000)
@@ -212,10 +213,12 @@ class RealViewEB(RealView):
     kmi1   = Pl050(pio_addr=0x10007000, int_num=21, is_mouse=True)
 
     l2x0_fake     = IsaFake(pio_addr=0x1f002000, pio_size=0xfff, warn_access="1")
+    flash_fake    = IsaFake(pio_addr=0x40000000, pio_size=0x20000000-1)
     dmac_fake     = AmbaFake(pio_addr=0x10030000)
     uart1_fake    = AmbaFake(pio_addr=0x1000a000)
     uart2_fake    = AmbaFake(pio_addr=0x1000b000)
     uart3_fake    = AmbaFake(pio_addr=0x1000c000)
+    smcreg_fake   = IsaFake(pio_addr=0x10080000, pio_size=0x10000-1)
     smc_fake      = AmbaFake(pio_addr=0x100e1000)
     sp810_fake    = AmbaFake(pio_addr=0x10001000, ignore_access=True)
     watchdog_fake = AmbaFake(pio_addr=0x10010000)
@@ -261,4 +264,6 @@ class RealViewEB(RealView):
        self.aaci_fake.pio     = bus.port
        self.mmc_fake.pio      = bus.port
        self.rtc_fake.pio      = bus.port
+       self.flash_fake.pio    = bus.port
+       self.smcreg_fake.pio   = bus.port
 

src/dev/arm/rv_ctrl.cc

@@ -97,8 +97,12 @@ RealViewCtrl::read(PacketPtr pkt)
       case Flags:
         pkt->set<uint32_t>(flags);
         break;
+      case IdReg:
+        pkt->set<uint32_t>(params()->idreg);
+        break;
       default:
-        panic("Tried to read RealView I/O at offset %#x that doesn't exist\n", daddr);
+        warn("Tried to read RealView I/O at offset %#x that doesn't exist\n",
+             daddr);
         break;
     }
     pkt->makeAtomicResponse();
@@ -128,7 +132,8 @@ RealViewCtrl::write(PacketPtr pkt)
         flags = pkt->get<uint32_t>();
         break;
       default:
-        panic("Tried to write RVIO at offset %#x that doesn't exist\n", daddr);
+        warn("Tried to write RVIO at offset %#x that doesn't exist\n",
+             daddr);
         break;
     }
     pkt->makeAtomicResponse();