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Removes APIC functionality

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Vladislav Belov committed 2026-10-17 15:53:16 +02:00
1 parent dcc66fdc57
commit 8c7dd6f85b
2 files changed
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source/lib/sysdep/arch/x86_x64/apic.cpp
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/* Copyright (C) 2025 Wildfire Games.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "precompiled.h"
#include "apic.h"
#include "lib/bits.h"
#include "lib/debug.h"
#include "lib/module_init.h"
#include "lib/status.h"
#include "lib/sysdep/arch/x86_x64/x86_x64.h"
#include "lib/sysdep/cpu.h" // ERR::CPU_FEATURE_MISSING
#include "lib/sysdep/os_cpu.h"
#include <algorithm>
#include <cstdint>
ApicId GetApicId()
{
x86_x64::CpuidRegs regs = { 0 };
regs.eax = 1;
// note: CPUID function 1 is always supported, but only processors with
// an xAPIC (e.g. P4/Athlon XP) will return a nonzero ID.
[[maybe_unused]] bool ok = x86_x64::cpuid(&regs);
ASSERT(ok);
const std::uint8_t apicId = static_cast<std::uint8_t>(bits(regs.ebx, 24, 31));
return apicId;
}
static size_t numIds;
static ApicId processorApicIds[os_cpu_MaxProcessors];
static ApicId sortedApicIds[os_cpu_MaxProcessors];
static Status GetAndValidateApicIds()
{
numIds = os_cpu_NumProcessors();
struct StoreEachProcessorsApicId
{
static void Callback(size_t processor, uintptr_t /*data*/)
{
processorApicIds[processor] = GetApicId();
}
};
// (can fail due to restrictions on our process affinity or lack of
// support for affinity masks in OS X.)
RETURN_STATUS_IF_ERR(os_cpu_CallByEachCPU(StoreEachProcessorsApicId::Callback, 0));
std::copy(processorApicIds, processorApicIds+numIds, sortedApicIds);
std::sort(sortedApicIds, sortedApicIds+numIds);
ApicId* const end = std::unique(sortedApicIds, sortedApicIds+numIds);
const size_t numUnique = end-sortedApicIds;
// all IDs are zero - system lacks an xAPIC.
// (NB: we exclude single-processor systems in this test -
// having one zero-valued ID is legitimate)
if(numUnique == 1 && sortedApicIds[0] == 0 && numIds != 1)
{
debug_printf("APIC: all zero\n");
return ERR::CPU_FEATURE_MISSING; // NOWARN
}
// not all unique - probably running in a VM whose emulation is
// imperfect or doesn't allow access to all processors.
if(numUnique != numIds)
{
debug_printf("APIC: not unique\n");
return ERR::FAIL; // NOWARN
}
return INFO::OK;
}
static Status InitApicIds()
{
const Status status = GetAndValidateApicIds();
if(status < 0) // failed
{
// generate fake but legitimate APIC IDs
for(size_t processor = 0; processor < numIds; processor++)
processorApicIds[processor] = sortedApicIds[processor] = (ApicId)processor;
}
return status;
}
static ModuleInitState apicInitState{ 0 };
bool AreApicIdsReliable()
{
ModuleInit(&apicInitState, InitApicIds);
if(apicInitState < 0)
return false;
return true;
}
bool IsProcessorKnown(ApicId apicId)
{
ModuleInit(&apicInitState, InitApicIds);
const ApicId* pos = std::find(processorApicIds, processorApicIds+numIds, apicId);
return pos != processorApicIds+numIds;
}
static size_t IndexFromApicId(const ApicId* apicIds, ApicId apicId)
{
ModuleInit(&apicInitState, InitApicIds);
const ApicId* pos = std::find(apicIds, apicIds+numIds, apicId);
if(pos == apicIds+numIds)
{
DEBUG_WARN_ERR(ERR::LOGIC);
return 0;
}
const size_t index = pos - apicIds;
return index;
}
size_t ProcessorFromApicId(ApicId apicId)
{
return IndexFromApicId(processorApicIds, apicId);
}
size_t ContiguousIdFromApicId(ApicId apicId)
{
return IndexFromApicId(sortedApicIds, apicId);
}
static ApicId ApicIdFromIndex(const ApicId* apicIds, size_t index)
{
ModuleInit(&apicInitState, InitApicIds);
ASSERT(index < numIds);
return apicIds[index];
}
ApicId ApicIdFromProcessor(size_t processor)
{
return ApicIdFromIndex(processorApicIds, processor);
}
ApicId ApicIdFromContiguousId(size_t contiguousId)
{
return ApicIdFromIndex(sortedApicIds, contiguousId);
}
source/lib/sysdep/arch/x86_x64/apic.h
-54
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@@ -1,54 +0,0 @@
/* Copyright (C) 2026 Wildfire Games.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef INCLUDED_X86_X64_APIC
#define INCLUDED_X86_X64_APIC
#include <cstddef>
typedef std::uint8_t ApicId; // not necessarily contiguous values
/**
* @return APIC ID of the currently executing processor or zero if the
* platform does not have an xAPIC (i.e. 7th generation x86 or below).
*
* rationale: the alternative of accessing the APIC mmio registers is not
* feasible. We also don't want to interfere with the OS's constant use of
* the APIC registers.
**/
ApicId GetApicId();
// if this returns false, apicId = contiguousId = processor.
// otherwise, there are unspecified but bijective mappings between
// apicId<->contiguousId and apicId<->processor.
bool AreApicIdsReliable();
// we may get the apicId of a processor we don't have access to.
bool IsProcessorKnown(ApicId apicId);
size_t ProcessorFromApicId(ApicId apicId);
size_t ContiguousIdFromApicId(ApicId apicId);
ApicId ApicIdFromProcessor(size_t contiguousId);
ApicId ApicIdFromContiguousId(size_t contiguousId);
#endif // #ifndef INCLUDED_X86_X64_APIC