ext: Add the NoMali GPU no-simulation library

Add revision 9adf9d6e2d889a483a92136c96eb8a434d360561 of NoMali-model
from https://github.com/ARM-software/nomali-model. This library
implements the register interface of the Mali T6xx/T7xx series GPUs,
but doesn't do any rendering. It can be used to hide the effects of
software rendering.

1 files changed, 221 insertions, 0 deletions

diff --git a/ext/nomali/lib/gpublock.hh b/ext/nomali/lib/gpublock.hh
new file mode 100644
index 000000000..330ffcb7c
--- /dev/null
+++ b/ext/nomali/lib/gpublock.hh
@@ -0,0 +1,221 @@
+/*
+ * Copyright (c) 2014-2015 ARM Limited
+ * All rights reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Authors: Andreas Sandberg
+ */
+
+#ifndef _LIBNOMALIMODEL_GPUBLOCK_HH
+#define _LIBNOMALIMODEL_GPUBLOCK_HH
+
+#include "types.hh"
+
+namespace NoMali {
+
+class GPU;
+
+/**
+ * Base class for GPU function blocks providing common access
+ * functions.
+ */
+class GPUBlock
+{
+  public:
+    GPUBlock(GPU &_gpu);
+    GPUBlock(GPU &_gpu, RegVector::size_type no_regs);
+    GPUBlock(GPUBlock &&rhs);
+    virtual ~GPUBlock() = 0;
+
+    /**
+     * Reset the function block.
+     *
+     * This method is called to simulated a hard reset of the GPU. It
+     * resets all registers to their default state and resets any
+     * block-specific state. The default implementation resets all
+     * registers to 0.
+     */
+    virtual void reset();
+
+
+    /**
+     * @{
+     * @name Register Interface
+     */
+
+    /**
+     * Read a register within a function block.
+     *
+     * @param addr Function-block relative address.
+     * @return Register value (32-bits)
+     */
+    virtual uint32_t readReg(RegAddr addr);
+
+    /**
+     * Write to a register within a function block.
+     *
+     * @param addr Function-block relative address.
+     * @param value New value (32-bits)
+     */
+    virtual void writeReg(RegAddr addr, uint32_t value);
+
+
+    /**
+     * Read a register within a function block without side effects.
+     *
+     * Unlike a normal read (readReg()), this method does not include
+     * any side effects and reads straight from the register file. It
+     * is primarily intended for things checkpointing.
+     *
+     * @param addr Function-block relative address.
+     * @return Register value (32-bits)
+     */
+    virtual uint32_t readRegRaw(RegAddr addr);
+
+    /**
+     * Write to a register within a function block without side
+     * effects.
+     *
+     * Unlike a normal write (writeReg()), this method does not
+     * include any side effects and writes straight into the register
+     * file. It is primarily intended for things checkpointing.
+     *
+     * @param addr Function-block relative address.
+     * @param value New value (32-bits)
+     */
+    virtual void writeRegRaw(RegAddr addr, uint32_t value);
+
+    /** @} */
+
+  protected:
+    /** Reference to the top-level GPU component */
+    GPU &gpu;
+
+    /** GPU block register file */
+    RegVector regs;
+
+
+  private:
+    /** Disable the default constructor */
+    GPUBlock();
+
+    /** Disable the copy constructor */
+    GPUBlock(GPUBlock &_rhs);
+
+    /** Disable the assignment operator */
+    GPUBlock &operator=(GPUBlock &_rhs);
+};
+
+/**
+ * Base class for interrupt enabled GPU function blocks.
+ *
+ * Function blocks with interrupt functionality implement four
+ * different registers controlling interrupts:
+ * <ul>
+ *   <li>XX_IRQ_RAWSTAT -- Raw interrupt state bit mask. (RW)
+ *   <li>XX_IRQ_CLEAR -- Interrupt clear register. (WO)
+ *   <li>XX_IRQ_MASK -- Bitmaks of enabled interrupts. (RW)
+ *   <li>XX_IRQ_STATUS -- Currently pending unmasked interrupts. (RO)
+ * </ul>
+ *
+ * This class provides implements the handling of the registers above
+ * and utility functions to raise interrupts from the function block
+ * models.
+ */
+class GPUBlockInt
+    : public GPUBlock
+{
+  public:
+    GPUBlockInt(GPU &_gpu,
+                const RegAddr &irq_raw_stat,
+                const RegAddr &irq_clear,
+                const RegAddr &irq_mask,
+                const RegAddr &irq_stat);
+    virtual ~GPUBlockInt() = 0;
+
+    uint32_t readReg(RegAddr addr) override;
+    void writeReg(RegAddr addr, uint32_t value) override;
+
+    /**
+     * Raise an interrupt from this function block.
+     *
+     * Calling this method flags the interrupts in ints as pending in
+     * the raw interrupt status register. If this operation asserts a
+     * new unmasked interrupt (i.e., the state of the interrupt status
+     * register changes), the onInterrupt() callback is called to
+     * signal an interrupt state change.
+     *
+     * @param ints Bitfield representing interrupts to raise.
+     */
+    void raiseInterrupt(uint32_t ints);
+
+    /**
+     * Clear an interrupt from this function block.
+     *
+     * Calling this method clears the interrupts in ints in the raw
+     * interrupt status register. If this operation clears a an
+     * existing interrupt (i.e., the state of the interrupt status
+     * register changes), the onInterrupt() callback is called to
+     * signal an interrupt state change.
+     *
+     * @param ints Bitfield representing interrupts to raise.
+     */
+    void clearInterrupt(uint32_t ints);
+
+    /**
+     * Current interrupt status
+     *
+     * @return The value of the raw interrupt status register
+     * logically anded with the interrupt mask register.
+     */
+    uint32_t irqStatus() const;
+
+    /**
+     * Are there unmasked interrupts pending?
+     *
+     * @return true if the interrupt status register is non-zero,
+     * false otherwise.
+     */
+    bool intAsserted() const { return !!irqStatus(); }
+
+  protected:
+    /**
+     * Callback method for interrupt status change.
+     *
+     * This method is called whenever the interrupt signal going out
+     * of this GPU block changes. The new state of the signal can be
+     * determined from the 'set' parameter which is non-zero if the
+     * inerrupt is raised and zero if it is cleared. The state of the
+     * interrupt signal can also be queried using the irqStatus()
+     * method.
+     *
+     * @see raiseInterrupt()
+     * @see clearInterrupt()
+     * @see irqStatus()
+     *
+     * @param set Non-zero to raise interrupt, zero to clear
+     * interrupt.
+     */
+    virtual void onInterrupt(int set) = 0;
+
+  private:
+    const RegAddr addrIrqRawStat;
+    const RegAddr addrIrqClear;
+    const RegAddr addrIrqMask;
+    const RegAddr addrIrqStat;
+};
+
+}
+
+#endif // _LIBNOMALIMODEL_GPUBLOCK_HH