| /* |
| * Copyright (c) 2010, 2013, 2015-2020 ARM Limited |
| * All rights reserved |
| * |
| * The license below extends only to copyright in the software and shall |
| * not be construed as granting a license to any other intellectual |
| * property including but not limited to intellectual property relating |
| * to a hardware implementation of the functionality of the software |
| * licensed hereunder. You may use the software subject to the license |
| * terms below provided that you ensure that this notice is replicated |
| * unmodified and in its entirety in all distributions of the software, |
| * modified or unmodified, in source code or in binary form. |
| * |
| * Copyright (c) 2005 The Regents of The University of Michigan |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer; |
| * redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution; |
| * neither the name of the copyright holders nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| |
| /** @file |
| * Implementation of a GICv2 |
| */ |
| |
| #ifndef __DEV_ARM_GICV2_H__ |
| #define __DEV_ARM_GICV2_H__ |
| |
| #include <vector> |
| |
| #include "arch/arm/interrupts.hh" |
| #include "base/addr_range.hh" |
| #include "base/bitunion.hh" |
| #include "dev/arm/base_gic.hh" |
| #include "dev/io_device.hh" |
| #include "dev/platform.hh" |
| #include "params/GicV2.hh" |
| |
| namespace gem5 |
| { |
| |
| class GicV2 : public BaseGic, public BaseGicRegisters |
| { |
| protected: |
| // distributor memory addresses |
| enum |
| { |
| GICD_CTLR = 0x000, // control register |
| GICD_TYPER = 0x004, // controller type |
| GICD_IIDR = 0x008, // implementer id |
| GICD_SGIR = 0xf00, // software generated interrupt |
| GICD_PIDR0 = 0xfe0, // distributor peripheral ID0 |
| GICD_PIDR1 = 0xfe4, // distributor peripheral ID1 |
| GICD_PIDR2 = 0xfe8, // distributor peripheral ID2 |
| GICD_PIDR3 = 0xfec, // distributor peripheral ID3 |
| |
| DIST_SIZE = 0x1000, |
| }; |
| |
| const uint32_t gicdPIDR; |
| const uint32_t gicdIIDR; |
| const uint32_t giccIIDR; |
| |
| static const AddrRange GICD_IGROUPR; // interrupt group (unimplemented) |
| static const AddrRange GICD_ISENABLER; // interrupt set enable |
| static const AddrRange GICD_ICENABLER; // interrupt clear enable |
| static const AddrRange GICD_ISPENDR; // set pending interrupt |
| static const AddrRange GICD_ICPENDR; // clear pending interrupt |
| static const AddrRange GICD_ISACTIVER; // active bit registers |
| static const AddrRange GICD_ICACTIVER; // clear bit registers |
| static const AddrRange GICD_IPRIORITYR; // interrupt priority registers |
| static const AddrRange GICD_ITARGETSR; // processor target registers |
| static const AddrRange GICD_ICFGR; // interrupt config registers |
| |
| // cpu memory addresses |
| enum |
| { |
| GICC_CTLR = 0x00, // CPU control register |
| GICC_PMR = 0x04, // Interrupt priority mask |
| GICC_BPR = 0x08, // binary point register |
| GICC_IAR = 0x0C, // interrupt ack register |
| GICC_EOIR = 0x10, // end of interrupt |
| GICC_RPR = 0x14, // running priority |
| GICC_HPPIR = 0x18, // highest pending interrupt |
| GICC_ABPR = 0x1c, // aliased binary point |
| GICC_APR0 = 0xd0, // active priority register 0 |
| GICC_APR1 = 0xd4, // active priority register 1 |
| GICC_APR2 = 0xd8, // active priority register 2 |
| GICC_APR3 = 0xdc, // active priority register 3 |
| GICC_IIDR = 0xfc, // cpu interface id register |
| GICC_DIR = 0x1000, // deactive interrupt register |
| }; |
| |
| static const int SGI_MAX = 16; // Number of Software Gen Interrupts |
| static const int PPI_MAX = 16; // Number of Private Peripheral Interrupts |
| |
| /** Mask off SGI's when setting/clearing pending bits */ |
| static const int SGI_MASK = 0xFFFF0000; |
| |
| /** Mask for bits that config N:N mode in GICD_ICFGR's */ |
| static const int NN_CONFIG_MASK = 0x55555555; |
| |
| static const int CPU_MAX = 256; // Max number of supported CPU interfaces |
| static const int SPURIOUS_INT = 1023; |
| static const int INT_BITS_MAX = 32; |
| static const int INT_LINES_MAX = 1020; |
| static const int GLOBAL_INT_LINES = INT_LINES_MAX - SGI_MAX - PPI_MAX; |
| |
| /** minimum value for Binary Point Register ("IMPLEMENTATION DEFINED"); |
| chosen for consistency with Linux's in-kernel KVM GIC model */ |
| static const int GICC_BPR_MINIMUM = 2; |
| |
| BitUnion32(SWI) |
| Bitfield<3,0> sgi_id; |
| Bitfield<23,16> cpu_list; |
| Bitfield<25,24> list_type; |
| EndBitUnion(SWI) |
| |
| BitUnion32(IAR) |
| Bitfield<9,0> ack_id; |
| Bitfield<12,10> cpu_id; |
| EndBitUnion(IAR) |
| |
| BitUnion32(CTLR) |
| Bitfield<3> fiqEn; |
| Bitfield<1> enableGrp1; |
| Bitfield<0> enableGrp0; |
| EndBitUnion(CTLR) |
| |
| protected: /* Params */ |
| /** Address range for the distributor interface */ |
| const AddrRange distRange; |
| |
| /** Address range for the CPU interfaces */ |
| const AddrRange cpuRange; |
| |
| /** All address ranges used by this GIC */ |
| const AddrRangeList addrRanges; |
| |
| /** Latency for a distributor operation */ |
| const Tick distPioDelay; |
| |
| /** Latency for a cpu operation */ |
| const Tick cpuPioDelay; |
| |
| /** Latency for a interrupt to get to CPU */ |
| const Tick intLatency; |
| |
| protected: |
| /** Gic enabled */ |
| bool enabled; |
| |
| /** Are gem5 extensions available? */ |
| const bool haveGem5Extensions; |
| |
| /** gem5 many-core extension enabled by driver */ |
| bool gem5ExtensionsEnabled; |
| |
| /** Number of itLines enabled */ |
| uint32_t itLines; |
| |
| /** Registers "banked for each connected processor" per ARM IHI0048B */ |
| struct BankedRegs : public Serializable |
| { |
| /** GICD_I{S,C}ENABLER0 |
| * interrupt enable bits for first 32 interrupts, 1b per interrupt */ |
| uint32_t intEnabled; |
| |
| /** GICD_I{S,C}PENDR0 |
| * interrupt pending bits for first 32 interrupts, 1b per interrupt */ |
| uint32_t pendingInt; |
| |
| /** GICD_I{S,C}ACTIVER0 |
| * interrupt active bits for first 32 interrupts, 1b per interrupt */ |
| uint32_t activeInt; |
| |
| /** GICD_IGROUPR0 |
| * interrupt group bits for first 32 interrupts, 1b per interrupt */ |
| uint32_t intGroup; |
| |
| /** GICD_ICFGR0, GICD_ICFGR1 |
| * interrupt config bits for first 32 interrupts, 2b per interrupt */ |
| uint32_t intConfig[2]; |
| |
| /** GICD_IPRIORITYR{0..7} |
| * interrupt priority for SGIs and PPIs */ |
| uint8_t intPriority[SGI_MAX + PPI_MAX]; |
| |
| void serialize(CheckpointOut &cp) const override; |
| void unserialize(CheckpointIn &cp) override; |
| |
| BankedRegs() : |
| intEnabled(0), pendingInt(0), activeInt(0), |
| intGroup(0), intConfig {0}, intPriority {0} |
| {} |
| }; |
| std::vector<BankedRegs*> bankedRegs; |
| |
| BankedRegs& getBankedRegs(ContextID); |
| |
| /** GICD_I{S,C}ENABLER{1..31} |
| * interrupt enable bits for global interrupts |
| * 1b per interrupt, 32 bits per word, 31 words */ |
| uint32_t intEnabled[INT_BITS_MAX-1]; |
| |
| uint32_t& |
| getIntEnabled(ContextID ctx, uint32_t ix) |
| { |
| if (ix == 0) { |
| return getBankedRegs(ctx).intEnabled; |
| } else { |
| return intEnabled[ix - 1]; |
| } |
| } |
| |
| /** GICD_I{S,C}PENDR{1..31} |
| * interrupt pending bits for global interrupts |
| * 1b per interrupt, 32 bits per word, 31 words */ |
| uint32_t pendingInt[INT_BITS_MAX-1]; |
| |
| uint32_t& |
| getPendingInt(ContextID ctx, uint32_t ix) |
| { |
| assert(ix < INT_BITS_MAX); |
| if (ix == 0) { |
| return getBankedRegs(ctx).pendingInt; |
| } else { |
| return pendingInt[ix - 1]; |
| } |
| } |
| |
| /** GICD_I{S,C}ACTIVER{1..31} |
| * interrupt active bits for global interrupts |
| * 1b per interrupt, 32 bits per word, 31 words */ |
| uint32_t activeInt[INT_BITS_MAX-1]; |
| |
| uint32_t& |
| getActiveInt(ContextID ctx, uint32_t ix) |
| { |
| assert(ix < INT_BITS_MAX); |
| if (ix == 0) { |
| return getBankedRegs(ctx).activeInt; |
| } else { |
| return activeInt[ix - 1]; |
| } |
| } |
| |
| /** GICD_IGROUPR{1..31} |
| * interrupt group bits for global interrupts |
| * 1b per interrupt, 32 bits per word, 31 words */ |
| uint32_t intGroup[INT_BITS_MAX-1]; |
| |
| uint32_t& |
| getIntGroup(ContextID ctx, uint32_t ix) |
| { |
| assert(ix < INT_BITS_MAX); |
| if (ix == 0) { |
| return getBankedRegs(ctx).intGroup; |
| } else { |
| return intGroup[ix - 1]; |
| } |
| } |
| |
| /** read only running priority register, 1 per cpu*/ |
| uint32_t iccrpr[CPU_MAX]; |
| |
| /** GICD_IPRIORITYR{8..255} |
| * an 8 bit priority (lower is higher priority) for each |
| * of the global (not replicated per CPU) interrupts. |
| */ |
| uint8_t intPriority[GLOBAL_INT_LINES]; |
| |
| uint8_t& |
| getIntPriority(ContextID ctx, uint32_t ix) |
| { |
| assert(ix < INT_LINES_MAX); |
| if (ix < SGI_MAX + PPI_MAX) { |
| return getBankedRegs(ctx).intPriority[ix]; |
| } else { |
| return intPriority[ix - (SGI_MAX + PPI_MAX)]; |
| } |
| } |
| |
| /** |
| * GICD_ICFGR{2...63} |
| * 2 bit per interrupt signaling if it's level or edge sensitive |
| * and if it is 1:N or N:N */ |
| uint32_t intConfig[INT_BITS_MAX*2 - 2]; |
| |
| /** |
| * Reads the GICD_ICFGRn register. |
| * @param ctx context id (PE specific) |
| * @param ix interrupt word index |
| * @returns the interrupt config word |
| */ |
| uint32_t& |
| getIntConfig(ContextID ctx, uint32_t ix) |
| { |
| assert(ix < INT_BITS_MAX*2); |
| if (ix < 2) { |
| /** SGIs and PPIs **/ |
| return getBankedRegs(ctx).intConfig[ix]; |
| } else { |
| return intConfig[ix - 2]; |
| } |
| } |
| |
| /** GICD_ITARGETSR{8..255} |
| * an 8 bit cpu target id for each global interrupt. |
| */ |
| uint8_t cpuTarget[GLOBAL_INT_LINES]; |
| |
| uint8_t |
| getCpuTarget(ContextID ctx, uint32_t ix) const |
| { |
| assert(ctx < sys->threads.numRunning()); |
| assert(ix < INT_LINES_MAX); |
| if (ix < SGI_MAX + PPI_MAX) { |
| // "GICD_ITARGETSR0 to GICD_ITARGETSR7 are read-only, and each |
| // field returns a value that corresponds only to the processor |
| // reading the register." |
| uint32_t ctx_mask; |
| if (gem5ExtensionsEnabled) { |
| ctx_mask = ctx; |
| } else { |
| fatal_if(ctx >= 8, |
| "%s requires the gem5_extensions parameter to support " |
| "more than 8 cores\n", name()); |
| // convert the CPU id number into a bit mask |
| ctx_mask = 1 << ctx; |
| } |
| return ctx_mask; |
| } else { |
| return cpuTarget[ix - 32]; |
| } |
| } |
| |
| bool |
| isLevelSensitive(ContextID ctx, uint32_t int_num) |
| { |
| if (int_num == SPURIOUS_INT) { |
| return false; |
| } else { |
| const auto ix = intNumToWord(int_num * 2); |
| const uint8_t cfg_hi = intNumToBit(int_num * 2) + 1; |
| return bits(getIntConfig(ctx, ix), cfg_hi) == 0; |
| } |
| } |
| |
| bool |
| isGroup0(ContextID ctx, uint32_t int_num) |
| { |
| const uint32_t group_reg = getIntGroup(ctx, intNumToWord(int_num)); |
| return !bits(group_reg, intNumToBit(int_num)); |
| } |
| |
| /** |
| * This method checks if an interrupt ID must be signaled or has been |
| * signaled as a FIQ to the cpu. It does that by reading: |
| * |
| * 1) GICD_IGROUPR: controls if the interrupt is part of group0 or |
| * group1. Only group0 interrupts can be signaled as FIQs. |
| * |
| * 2) GICC_CTLR.FIQEn: controls whether the CPU interface signals Group 0 |
| * interrupts to a target processor using the FIQ or the IRQ signal |
| */ |
| bool |
| isFiq(ContextID ctx, uint32_t int_num) |
| { |
| const bool is_group0 = isGroup0(ctx, int_num); |
| const bool use_fiq = cpuControl[ctx].fiqEn; |
| |
| if (is_group0 && use_fiq) { |
| return true; |
| } else { |
| return false; |
| } |
| } |
| |
| /** CPU enabled: |
| * Checks if GICC_CTLR.EnableGrp0 or EnableGrp1 are set |
| */ |
| bool |
| cpuEnabled(ContextID ctx) const |
| { |
| return cpuControl[ctx].enableGrp0 || |
| cpuControl[ctx].enableGrp1; |
| } |
| |
| /** GICC_CTLR: |
| * CPU interface control register |
| */ |
| CTLR cpuControl[CPU_MAX]; |
| |
| /** CPU priority */ |
| uint8_t cpuPriority[CPU_MAX]; |
| uint8_t getCpuPriority(unsigned cpu); // BPR-adjusted priority value |
| |
| /** Binary point registers */ |
| uint8_t cpuBpr[CPU_MAX]; |
| |
| /** highest interrupt that is interrupting CPU */ |
| uint32_t cpuHighestInt[CPU_MAX]; |
| |
| /** One bit per cpu per software interrupt that is pending for each |
| * possible sgi source. Indexed by SGI number. Each byte in generating cpu |
| * id and bits in position is destination id. e.g. 0x4 = CPU 0 generated |
| * interrupt for CPU 2. */ |
| uint64_t cpuSgiPending[SGI_MAX]; |
| uint64_t cpuSgiActive[SGI_MAX]; |
| |
| /** SGI pending arrays for gem5 GIC extension mode, which instead keeps |
| * 16 SGI pending bits for each of the (large number of) CPUs. |
| */ |
| uint32_t cpuSgiPendingExt[CPU_MAX]; |
| uint32_t cpuSgiActiveExt[CPU_MAX]; |
| |
| /** One bit per private peripheral interrupt. Only upper 16 bits |
| * will be used since PPI interrupts are numberred from 16 to 32 */ |
| uint32_t cpuPpiPending[CPU_MAX]; |
| uint32_t cpuPpiActive[CPU_MAX]; |
| |
| /** software generated interrupt |
| * @param data data to decode that indicates which cpus to interrupt |
| */ |
| void softInt(ContextID ctx, SWI swi); |
| |
| /** See if some processor interrupt flags need to be enabled/disabled |
| * @param hint which set of interrupts needs to be checked |
| */ |
| virtual void updateIntState(int hint); |
| |
| /** Update the register that records priority of the highest priority |
| * active interrupt*/ |
| void updateRunPri(); |
| |
| /** generate a bit mask to check cpuSgi for an interrupt. */ |
| uint64_t genSwiMask(int cpu); |
| |
| int intNumToWord(int num) const { return num >> 5; } |
| int intNumToBit(int num) const { return num % 32; } |
| |
| /** Clears a cpu IRQ or FIQ signal */ |
| void clearInt(ContextID ctx, uint32_t int_num); |
| |
| /** |
| * Post an interrupt to a CPU with a delay |
| */ |
| void postInt(uint32_t cpu, Tick when); |
| void postFiq(uint32_t cpu, Tick when); |
| |
| /** |
| * Deliver a delayed interrupt to the target CPU |
| */ |
| void postDelayedInt(uint32_t cpu); |
| void postDelayedFiq(uint32_t cpu); |
| |
| EventFunctionWrapper *postIntEvent[CPU_MAX]; |
| EventFunctionWrapper *postFiqEvent[CPU_MAX]; |
| int pendingDelayedInterrupts; |
| |
| public: |
| using Params = GicV2Params; |
| GicV2(const Params &p); |
| ~GicV2(); |
| |
| DrainState drain() override; |
| void drainResume() override; |
| |
| void serialize(CheckpointOut &cp) const override; |
| void unserialize(CheckpointIn &cp) override; |
| |
| public: /* PioDevice */ |
| AddrRangeList getAddrRanges() const override { return addrRanges; } |
| |
| /** A PIO read to the device, immediately split up into |
| * readDistributor() or readCpu() |
| */ |
| Tick read(PacketPtr pkt) override; |
| |
| /** A PIO read to the device, immediately split up into |
| * writeDistributor() or writeCpu() |
| */ |
| Tick write(PacketPtr pkt) override; |
| |
| public: /* BaseGic */ |
| void sendInt(uint32_t number) override; |
| void clearInt(uint32_t number) override; |
| |
| void sendPPInt(uint32_t num, uint32_t cpu) override; |
| void clearPPInt(uint32_t num, uint32_t cpu) override; |
| |
| bool supportsVersion(GicVersion version) override; |
| |
| protected: |
| /** Handle a read to the distributor portion of the GIC |
| * @param pkt packet to respond to |
| */ |
| Tick readDistributor(PacketPtr pkt); |
| uint32_t readDistributor(ContextID ctx, Addr daddr, |
| size_t resp_sz); |
| uint32_t |
| readDistributor(ContextID ctx, Addr daddr) override |
| { |
| return readDistributor(ctx, daddr, 4); |
| } |
| |
| /** Handle a read to the cpu portion of the GIC |
| * @param pkt packet to respond to |
| */ |
| Tick readCpu(PacketPtr pkt); |
| uint32_t readCpu(ContextID ctx, Addr daddr) override; |
| |
| /** Handle a write to the distributor portion of the GIC |
| * @param pkt packet to respond to |
| */ |
| Tick writeDistributor(PacketPtr pkt); |
| void writeDistributor(ContextID ctx, Addr daddr, |
| uint32_t data, size_t data_sz); |
| void |
| writeDistributor(ContextID ctx, Addr daddr, uint32_t data) override |
| { |
| return writeDistributor(ctx, daddr, data, 4); |
| } |
| |
| /** Handle a write to the cpu portion of the GIC |
| * @param pkt packet to respond to |
| */ |
| Tick writeCpu(PacketPtr pkt); |
| void writeCpu(ContextID ctx, Addr daddr, uint32_t data) override; |
| }; |
| |
| } // namespace gem5 |
| |
| #endif //__DEV_ARM_GIC_H__ |
