diff options
Diffstat (limited to 'src/kernel/cpumgr.C')
| -rw-r--r-- | src/kernel/cpumgr.C | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/src/kernel/cpumgr.C b/src/kernel/cpumgr.C index 7be1cf2dc..fc421431e 100644 --- a/src/kernel/cpumgr.C +++ b/src/kernel/cpumgr.C @@ -1,3 +1,4 @@ +#include <assert.h> #include <kernel/cpumgr.H> #include <kernel/task.H> #include <kernel/cpu.H> @@ -9,6 +10,7 @@ #include <arch/ppc.H> #include <kernel/timemgr.H> #include <sys/sync.h> +#include <kernel/cpuid.H> cpu_t* CpuManager::cv_cpus[CpuManager::MAXCPUS] = { NULL }; bool CpuManager::cv_shutdown_requested = false; @@ -27,8 +29,36 @@ cpu_t* CpuManager::getCurrentCPU() void CpuManager::init() { - for (int i = 0; i < KERNEL_MAX_SUPPORTED_CPUS; i++) - Singleton<CpuManager>::instance().startCPU(i); + // For the initial boot we only want to set up CPU objects for the threads + // on this core. Otherwise we waste memory with kernel / idle task stacks. + // + // As long as the CPU object pointer is NULL, the start.S code won't + // enter the kernel, so we skip initializing all the other CPUs for now. + + // Determine number of threads on this core. + size_t threads = -1; + switch (getCpuType()) + { + case POWER7: + case POWER7_PLUS: + threads = 4; + break; + + case POWER8_VENICE: + case POWER8_SALERNO: + threads = 8; + break; + + case UNKNOWN: + default: + kassert(false); + break; + } + + // Create CPU objects starting at the thread-0 for this core. + size_t baseCpu = getPIR() & ~(threads-1); + for (size_t i = 0; i < threads; i++) + Singleton<CpuManager>::instance().startCPU(i + baseCpu); } void CpuManager::init_slave_smp(cpu_t* cpu) |
