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kernel/x86: Use call_single_cpu_sync in get_cpuid.

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Sends a more targeted ICI than a broadcast.
This commit is contained in:
Augustin Cavalier
2026-03-10 17:55:12 -04:00
parent 1d740a6700
commit a2e4f9f75f
1 changed files with 21 additions and 22 deletions
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src/system/kernel/arch/x86/arch_system_info.cpp
+21 -22
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@@ -13,24 +13,29 @@
#include <boot/kernel_args.h> #include <boot/kernel_args.h>
#include <cpu.h> #include <cpu.h>
#include <debug.h>
#include <kernel.h> #include <kernel.h>
#include <smp.h> #include <smp.h>
enum cpu_vendor sCPUVendor; static enum cpu_vendor sCPUVendor;
uint32 sCPUModel; static uint32 sCPUModel;
int64 sCPUClockSpeed; static int64 sCPUClockSpeed;
static bool struct get_cpuid_args {
get_cpuid_for(cpuid_info *info, uint32 currentCPU, uint32 eaxRegister, int forCPU;
uint32 forCPU) cpuid_info* info;
uint32 eaxRegister;
};
static void
get_cpuid_for(void* arg, int currentCPU)
{ {
if (currentCPU != forCPU) get_cpuid_args* args = (get_cpuid_args*)arg;
return false; ASSERT(currentCPU == args->forCPU);
get_current_cpuid(args->info, args->eaxRegister, 0);
get_current_cpuid(info, eaxRegister, 0);
return true;
} }
@@ -38,23 +43,17 @@ status_t
get_cpuid(cpuid_info *info, uint32 eaxRegister, uint32 forCPU) get_cpuid(cpuid_info *info, uint32 eaxRegister, uint32 forCPU)
{ {
uint32 numCPUs = (uint32)smp_get_num_cpus(); uint32 numCPUs = (uint32)smp_get_num_cpus();
cpu_status state;
if (forCPU >= numCPUs) if (forCPU >= numCPUs)
return B_BAD_VALUE; return B_BAD_VALUE;
// prevent us from being rescheduled get_cpuid_args args;
state = disable_interrupts(); args.forCPU = forCPU;
args.info = info;
args.eaxRegister = eaxRegister;
// ToDo: as long as we only run on pentium-class systems, we can assume // ToDo: as long as we only run on pentium-class systems, we can assume
// that the CPU supports cpuid. // that the CPU supports cpuid.
call_single_cpu_sync(forCPU, get_cpuid_for, &args);
if (!get_cpuid_for(info, smp_get_current_cpu(), eaxRegister, forCPU)) {
smp_send_broadcast_ici(SMP_MSG_CALL_FUNCTION, (addr_t)info,
eaxRegister, forCPU, (void *)get_cpuid_for, SMP_MSG_FLAG_SYNC);
}
restore_interrupts(state);
return B_OK; return B_OK;
} }