/* IBM_PROLOG_BEGIN_TAG */ /* This is an automatically generated prolog. */ /* */ /* $Source: src/include/kernel/cpumgr.H $ */ /* */ /* OpenPOWER HostBoot Project */ /* */ /* COPYRIGHT International Business Machines Corp. 2010,2014 */ /* */ /* 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. */ /* */ /* IBM_PROLOG_END_TAG */ #ifndef __KERNEL_CPUMGR_H #define __KERNEL_CPUMGR_H #include #include #include #include class CpuManager { public: enum { CPU_PERIODIC_CHECK_MEMORY = 128, // Is this even needed anymore? CPU_PERIODIC_FLUSH_PAGETABLE = 256, CPU_PERIODIC_DEFRAG = 949, // TODO Any bigger not currently hit }; /** @fn getCurrentCPU * Returns a pointer to the current CPU structure by using the * task structure in SPRG3. */ static cpu_t* getCurrentCPU() { size_t pir = getPIR(); return cv_cpus[pir / KERNEL_MAX_SUPPORTED_CPUS_PER_NODE] [pir % KERNEL_MAX_SUPPORTED_CPUS_PER_NODE]; } static cpu_t* getCpu(size_t i) { cpu_t** c = cv_cpus[i / KERNEL_MAX_SUPPORTED_CPUS_PER_NODE]; if (NULL == c) { return NULL; } else { return c[i % KERNEL_MAX_SUPPORTED_CPUS_PER_NODE]; } } /** @brief Return pointer to master CPU object. */ static cpu_t* getMasterCPU(); static void init(); static void init_slave_smp(cpu_t*); /** @fn requestShutdown * Requests that all CPUs shutdown */ static void requestShutdown(uint64_t i_status); /** @fn isShutdownRequested * Returns if a shutdown of all CPUs was requested */ static bool isShutdownRequested() { return cv_shutdown_requested; } /** @fn getShutdownStatus * Returns the status code that needs to be posted during shutdown */ static uint32_t getShutdownStatus() { return cv_shutdown_status; } /** @fn executePeriodics * Perform periodic actions * @param[in] cpu_t the CPU */ static void executePeriodics(cpu_t * i_cpu); /** @fn activateCPU * Activate a cpu to show it is running * @param[in] cpu_t the CPU * @post Active flag on in cpu_t structure */ static void activateCPU(cpu_t * i_cpu); /** @fn deactivateCPU * Deactivate a cpu to show it is not running. * @param[in] cpu_t the CPU * @post Active flag is off in cpu_t structure. */ static void deactivateCPU(cpu_t * i_cpu); /** @fn getCpuCount * Return the number of active CPUs. */ static size_t getCpuCount() { return cv_cpuSeq & 0xFFFFFFFF; } /** @fn getCpuSeqId * Return the current CPU start sequence ID. */ static size_t getCpuSeqId() { return cv_cpuSeq >> 32; } /** @fn getCpuCountAndSeqId * Atomically retrieve both the current active CPU count and * sequence ID. * */ static void getCpuCountAndSeqId(uint32_t& o_count, uint32_t& o_seq) { uint64_t cpuSeq = cv_cpuSeq; o_count = cpuSeq & 0xFFFFFFFF; o_seq = cpuSeq >> 32; } /** @fn getThreadCount * Return the number of HW threads for this CPU core type. */ static size_t getThreadCount(); /** @fn startCore * Create structures to support a core activating and start the core. * * @param[in] pir - PIR value of first thread in core. * @param[in] i_threads - Bitstring of threads to enable (left-justified). */ static void startCore(uint64_t pir,uint64_t i_threads); /** @fn forceMemoryPeriodic() * Force the memory free / coalesce operations to be performed on the * next "periodic" interval. */ static void forceMemoryPeriodic(); /** @fn critAssert() * Functional call to force terminate immediate on all threads * @param[in] i_failAddr - Address from where the assert was called */ static void critAssert(uint64_t i_failAddr); /** Desired value for MSR after wakeup. * * bit 0 - 64 bit mode. * bit 3 - Hypervisor mode. * bit 51 - Machine-check enable */ static const uint64_t WAKEUP_MSR_VALUE = 0x9000000000001000; /** Desired value for LPCR after wakeup. * * bit 49 - Wake-up from external interrupt. * bit 50 - Wake-up from decrementer. * bit 51 - Wake-up from machine check. * bit 60 - LPES(0) = 1 (see ISA). * bit 61 - LPES(1) = 0 (P8 RFC02204 forces to 0) */ static const uint64_t WAKEUP_LPCR_VALUE = 0x0000000000007008; /** Desired value for RPR after wakeup. * * Priority Us PHYP * Very Low 0 0 * Low 1 1 <--- hostboot "low" * Med Low 3 3 * Med 32 7 <--- hostboot "high" * Med High 33 15 * High 34 31 * Very High 63 63 */ static const uint64_t WAKEUP_RPR_VALUE = 0x0001032021223F; protected: CpuManager(); ~CpuManager() {} /** @fn startCPU * Starts the requested CPU. Default of -1 implies current CPU. */ void startCPU(ssize_t i = -1); void startSlaveCPU(cpu_t*); private: /** Per-CPU kernel structures. * * There is one entry per hardware thread and they are stored as * a two dimensional array of (cpu_t*)s: cv_cpus[node][thread] * * This needs to be a global variable rather than an instance * variable of a singleton because it is needed within the kernel * assembly code for interrupt / exception handling. For instance, * when secondary CPUs start they need to find their own stack from * these structures. Any changes to this structure needs to be * kept in sync with the assembly code (ex. start.S). */ static cpu_t** cv_cpus[KERNEL_MAX_SUPPORTED_NODES]; /** Number of active CPUs. * Stored as "(seqID << 32) | cpus" */ static uint64_t cv_cpuSeq; static bool cv_forcedMemPeriodic; //!< force free / coalesce. // If a shutdown of all CPUs is requested static bool cv_shutdown_requested; // The status code that needs to be posted during shutdown static uint64_t cv_shutdown_status; static InteractiveDebug cv_interactive_debug; /** Timebase of the master the last time a CPU was started. * * This is used when slave CPUs activate to determine if the * timebases need to be synchronized. */ uint64_t iv_lastStartTimebase; }; #endif