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banan-os/kernel/arch/i386/APIC.cpp

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#include <kernel/APIC.h>
#include <kernel/CPUID.h>
#include <kernel/IDT.h>
#include <kernel/IO.h>
#include <kernel/MMU.h>
#include <kernel/PIC.h>
#include <kernel/Serial.h>
#include <stdint.h>
#include <string.h>
#define APIC_DEBUG_PRINT 0
#define IA32_APIC_BASE 0x1B
#define IA32_APIC_BASE_ENABLE (1 << 11)
namespace APIC
{
static bool s_using_fallback_pic = false;
static uint8_t s_processor_ids[0x100] { };
static uint8_t s_lapic_ids[0x100] { };
static uint8_t s_lapic_count = 0;
static uint32_t s_local_apic = 0;
static uint32_t s_io_apic = 0;
static uint8_t s_overrides[0x100];
struct RSDPDescriptor
{
char signature[8];
uint8_t checksum;
char OEMID[6];
uint8_t revision;
uint32_t rsdt_address;
} __attribute__ ((packed));
struct RSDPDescriptor20
{
RSDPDescriptor firstPart;
uint32_t length;
uint64_t xsdt_address;
uint8_t extended_checksum;
uint8_t reserved[3];
} __attribute__((packed));
struct ACPISDTHeader
{
char signature[4];
uint32_t length;
uint8_t eevision;
uint8_t checksum;
char OEMID[6];
char OEM_table_id[8];
uint32_t OEM_revision;
uint32_t creator_id;
uint32_t creator_revision;
} __attribute__((packed));
struct RSDT
{
ACPISDTHeader header;
uint32_t sdt_pointer[0];
};
struct XSDT
{
ACPISDTHeader header;
uint64_t sdt_pointer[0];
};
struct MADT
{
ACPISDTHeader header;
uint32_t local_apic;
uint32_t flags;
} __attribute__((packed));
struct MADTEntry
{
uint8_t type;
uint8_t length;
union
{
struct
{
uint8_t acpi_processor_id;
uint8_t apic_id;
uint32_t flags;
} __attribute__((packed)) entry0;
struct
{
uint8_t ioapic_id;
uint8_t reserved;
uint32_t ioapic_address;
uint32_t gsi_base;
} __attribute__((packed)) entry1;
struct
{
uint8_t bus_source;
uint8_t irq_source;
uint32_t gsi;
uint16_t flags;
} __attribute__((packed)) entry2;
struct
{
uint8_t nmi_source;
uint8_t reserved;
uint16_t flags;
uint32_t gsi;
} __attribute__((packed)) entry3;
struct
{
uint8_t acpi_processor_id;
uint16_t flags;
uint8_t lint;
} __attribute__((packed)) entry4;
struct
{
uint16_t reserved;
uint64_t address;
} __attribute__((packed)) entry5;
struct
{
uint16_t reserved;
uint32_t local_x2acpi_id;
uint32_t flags;
uint32_t acpi_id;
} __attribute__((packed)) entry9;
};
} __attribute__((packed));
union RedirectionEntry
{
struct
{
uint64_t vector : 8;
uint64_t delivery_mode : 3;
uint64_t destination_mode : 1;
uint64_t delivery_status : 1;
uint64_t pin_polarity : 1;
uint64_t remote_irr : 1;
uint64_t trigger_mode : 1;
uint64_t mask : 1;
uint64_t reserved : 39;
uint64_t destination : 8;
};
struct
{
uint32_t lo_dword;
uint32_t hi_dword;
};
};
static uint32_t ReadLocalAPIC(uint32_t offset);
static void WriteLocalAPIC(uint32_t offset, uint32_t value);
static uint32_t ReadIOAPIC(uint8_t reg);
static void WriteIOAPIC(uint8_t reg, uint32_t value);
static void SetMSR(uint32_t msr, uint32_t lo, uint32_t hi);
static bool IsRSDP(RSDPDescriptor* rsdp)
{
if (memcmp(rsdp->signature, "RSD PTR ", 8) != 0)
return false;
{
uint8_t checksum = 0;
for (uint32_t i = 0; i < sizeof(RSDPDescriptor); i++)
checksum += ((uint8_t*)rsdp)[i];
if (checksum != 0)
return false;
}
if (rsdp->revision == 2)
{
RSDPDescriptor20* rsdp20 = (RSDPDescriptor20*)rsdp;
uint8_t checksum = 0;
for (uint32_t i = 0; i < sizeof(RSDPDescriptor20); i++)
checksum += ((uint8_t*)rsdp20)[i];
if (checksum != 0)
return false;
}
return true;
}
static RSDPDescriptor* LocateRSDP()
{
// Look in main BIOS area below 1 MB
for (uint32_t addr = 0x000E0000; addr < 0x000FFFFF; addr += 16)
if (IsRSDP((RSDPDescriptor*)addr))
return (RSDPDescriptor*)addr;
return nullptr;
}
static bool IsValidACPISDTHeader(ACPISDTHeader* header)
{
uint8_t sum = 0;
for (uint32_t i = 0; i < header->length; i++)
sum += ((uint8_t*)header)[i];
return sum == 0;
}
static void ParseMADT(RSDPDescriptor* rsdp)
{
RSDT* const root = (RSDT*)(rsdp->revision == 2 ? ((RSDPDescriptor20*)rsdp)->xsdt_address : rsdp->rsdt_address);
MMU::Get().AllocatePage((uintptr_t)root);
uint32_t sdt_entry_count = (root->header.length - sizeof(root->header)) / (rsdp->revision == 2 ? 8 : 4);
for (uint32_t i = 0; i < sdt_entry_count; i++)
{
ACPISDTHeader* header = (ACPISDTHeader*)(rsdp->revision == 2 ? ((uint64_t*)root->sdt_pointer)[i] : root->sdt_pointer[i]);
if (!IsValidACPISDTHeader(header))
continue;
if (memcmp(header->signature, "APIC", 4) == 0)
{
MADT* madt = (MADT*)header;
s_local_apic = madt->local_apic;
uint32_t entry_addr = (uint32_t)madt + sizeof(MADT);
while (entry_addr < (uint32_t)madt + madt->header.length)
{
MADTEntry* entry = (MADTEntry*)entry_addr;
switch (entry->type)
{
case 0:
s_processor_ids[s_lapic_count] = entry->entry0.acpi_processor_id;
s_lapic_ids[s_lapic_count] = entry->entry0.apic_id;
s_lapic_count++;
#if APIC_DEBUG_PRINT >= 2
dprintln("Entry0, processor id {}, apic id {}, flags 0b{32b}",
entry->entry0.acpi_processor_id,
entry->entry0.apic_id,
entry->entry0.flags
);
#endif
break;
case 1:
if (s_io_apic == 0)
s_io_apic = entry->entry1.ioapic_address;
#if APIC_DEBUG_PRINT
dprintln("Entry1, io apic id {}, io apic address 0x{4H}, gsi base {}",
entry->entry1.ioapic_id,
entry->entry1.ioapic_address,
entry->entry1.gsi_base
);
#endif
break;
case 2:
s_overrides[entry->entry2.irq_source] = entry->entry2.gsi;
#if APIC_DEBUG_PRINT
dprintln("Entry2, bus source {}, irq source {}, gsi {}, flags 0b{16b}",
entry->entry2.bus_source,
entry->entry2.irq_source,
entry->entry2.gsi,
entry->entry2.flags
);
#endif
break;
case 3:
#if APIC_DEBUG_PRINT
dprintln("Entry3, nmi source {}, flags 0b{16b}, gsi {}",
entry->entry3.nmi_source,
entry->entry3.flags,
entry->entry3.gsi
);
#endif
break;
case 4:
#if APIC_DEBUG_PRINT
dprintln("Entry4, acpi processor id 0x{2H}, flags 0b{16b}, lint{}",
entry->entry4.acpi_processor_id,
entry->entry4.flags,
entry->entry4.lint
);
#endif
break;
case 5:
s_local_apic = entry->entry5.address;
#if APIC_DEBUG_PRINT
dprintln("Entry5, address 0x{4H}",
entry->entry5.address
);
#endif
break;
case 9:
#if APIC_DEBUG_PRINT
dprintln("Entry9, x2 acpi id {}, flags 0b{32b}, acpi id {}",
entry->entry9.local_x2acpi_id,
entry->entry9.flags,
entry->entry9.acpi_id
);
#endif
break;
default:
break;
}
entry_addr += entry->length;
}
}
}
MMU::Get().UnAllocatePage((uintptr_t)root);
}
static uint32_t ReadLocalAPIC(uint32_t offset)
{
return *(uint32_t*)(s_local_apic + offset);
}
static void WriteLocalAPIC(uint32_t offset, uint32_t value)
{
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Warray-bounds"
*(uint32_t*)(s_local_apic + offset) = value;
#pragma GCC diagnostic pop
}
static uint32_t ReadIOAPIC(uint8_t reg)
{
volatile uint32_t* ioapic = (volatile uint32_t*)s_io_apic;
ioapic[0] = reg;
return ioapic[4];
}
static void WriteIOAPIC(uint8_t reg, uint32_t value)
{
volatile uint32_t* ioapic = (volatile uint32_t*)s_io_apic;
ioapic[0] = reg;
ioapic[4] = value;
}
static void SetMSR(uint32_t msr, uint32_t lo, uint32_t hi)
{
asm volatile("wrmsr" : : "a"(lo), "d"(hi), "c"(msr));
}
static bool InitializeAPIC()
{
uint32_t ecx, edx;
CPUID::GetFeatures(ecx, edx);
if (!(edx & CPUID::Features::EDX_APIC))
{
dprintln("Local APIC not available");
return false;
}
if (!(edx & CPUID::Features::EDX_MSR))
{
dprintln("MSR not available");
return false;
}
RSDPDescriptor* rsdp = LocateRSDP();
if (rsdp == nullptr)
{
dprintln("Could not locate RSDP");
return false;
}
ParseMADT(rsdp);
if (s_local_apic == 0 || s_io_apic == 0)
return false;
MMU::Get().AllocatePage(s_io_apic);
MMU::Get().AllocatePage(s_local_apic);
// Enable Local APIC
SetMSR(IA32_APIC_BASE, (s_local_apic & 0xFFFFF000) | IA32_APIC_BASE_ENABLE, 0);
uint32_t sivr = ReadLocalAPIC(0xF0);
WriteLocalAPIC(0xF0, sivr | 0x1FF);
return true;
}
void Initialize(bool force_pic)
{
for (uint32_t i = 0x00; i <= 0xFF; i++)
s_overrides[i] = i;
PIC::MaskAll();
PIC::Remap();
if (force_pic)
{
dprintln("Using PIC instead of APIC");
s_using_fallback_pic = true;
}
else if (!InitializeAPIC())
{
dprintln("Could not initialize APIC. Using PIC as fallback");
s_using_fallback_pic = true;
}
}
void EOI(uint8_t irq)
{
if (s_using_fallback_pic)
return PIC::EOI(irq);
WriteLocalAPIC(0xB0, 0);
}
void GetISR(uint32_t out[8])
{
if (s_using_fallback_pic)
{
memset(out, 0, sizeof(uint32_t) * 8);
uint32_t addr = (uint32_t)out + IRQ_VECTOR_BASE / 8;
*(uint16_t*)addr = PIC::GetISR();
return;
}
for (uint32_t i = 0; i < 8; i++)
out[i] = ReadLocalAPIC(0x100 + i * 0x10);
}
void EnableIRQ(uint8_t irq)
{
if (s_using_fallback_pic)
return PIC::Unmask(irq);
uint32_t gsi = s_overrides[irq];
RedirectionEntry redir;
redir.lo_dword = ReadIOAPIC(0x10 + gsi * 2);
redir.hi_dword = ReadIOAPIC(0x10 + gsi * 2 + 1);
redir.vector = IRQ_VECTOR_BASE + irq;
redir.mask = 0;
redir.destination = s_lapic_ids[0];
WriteIOAPIC(0x10 + gsi * 2, redir.lo_dword);
WriteIOAPIC(0x10 + gsi * 2 + 1, redir.hi_dword);
}
}
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