forked from Bananymous/banan-os
449 lines
9.8 KiB
C++
449 lines
9.8 KiB
C++
#include <kernel/APIC.h>
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#include <kernel/CPUID.h>
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#include <kernel/IDT.h>
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#include <kernel/IO.h>
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#include <kernel/kprint.h>
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#include <kernel/Paging.h>
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#include <kernel/panic.h>
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#include <kernel/PIC.h>
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#include <kernel/Serial.h>
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#include <stdint.h>
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#include <string.h>
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#define DEGUB_PRINT 0
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#define IA32_APIC_BASE 0x1B
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#define IA32_APIC_BASE_ENABLE (1 << 11)
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namespace APIC
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{
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static bool s_using_fallback_pic = false;
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static uint8_t s_processor_ids[0x100] { };
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static uint8_t s_lapic_ids[0x100] { };
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static uint8_t s_lapic_count = 0;
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static uint32_t s_local_apic = 0;
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static uint32_t s_io_apic = 0;
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static uint8_t s_overrides[0x100];
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struct RSDPDescriptor
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{
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char signature[8];
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uint8_t checksum;
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char OEMID[6];
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uint8_t revision;
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uint32_t rsdt_address;
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} __attribute__ ((packed));
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struct RSDPDescriptor20
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{
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RSDPDescriptor firstPart;
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uint32_t length;
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uint64_t xsdt_address;
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uint8_t extended_checksum;
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uint8_t reserved[3];
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} __attribute__((packed));
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struct ACPISDTHeader
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{
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char signature[4];
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uint32_t length;
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uint8_t eevision;
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uint8_t checksum;
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char OEMID[6];
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char OEM_table_id[8];
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uint32_t OEM_revision;
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uint32_t creator_id;
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uint32_t creator_revision;
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} __attribute__((packed));
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struct RSDT
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{
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ACPISDTHeader header;
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uint32_t sdt_pointer[0];
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};
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struct XSDT
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{
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ACPISDTHeader header;
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uint64_t sdt_pointer[0];
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};
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struct MADT
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{
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ACPISDTHeader header;
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uint32_t local_apic;
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uint32_t flags;
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} __attribute__((packed));
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struct MADTEntry
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{
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uint8_t type;
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uint8_t length;
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union
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{
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struct
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{
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uint8_t acpi_processor_id;
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uint8_t apic_id;
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uint32_t flags;
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} __attribute__((packed)) entry0;
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struct
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{
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uint8_t ioapic_id;
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uint8_t reserved;
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uint32_t ioapic_address;
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uint32_t gsi_base;
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} __attribute__((packed)) entry1;
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struct
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{
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uint8_t bus_source;
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uint8_t irq_source;
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uint32_t gsi;
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uint16_t flags;
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} __attribute__((packed)) entry2;
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struct
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{
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uint8_t nmi_source;
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uint8_t reserved;
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uint16_t flags;
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uint32_t gsi;
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} __attribute__((packed)) entry3;
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struct
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{
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uint8_t acpi_processor_id;
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uint16_t flags;
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uint8_t lint;
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} __attribute__((packed)) entry4;
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struct
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{
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uint16_t reserved;
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uint64_t address;
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} __attribute__((packed)) entry5;
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struct
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{
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uint16_t reserved;
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uint32_t local_x2acpi_id;
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uint32_t flags;
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uint32_t acpi_id;
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} __attribute__((packed)) entry9;
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};
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} __attribute__((packed));
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union RedirectionEntry
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{
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struct
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{
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uint64_t vector : 8;
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uint64_t delivery_mode : 3;
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uint64_t destination_mode : 1;
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uint64_t delivery_status : 1;
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uint64_t pin_polarity : 1;
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uint64_t remote_irr : 1;
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uint64_t trigger_mode : 1;
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uint64_t mask : 1;
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uint64_t reserved : 39;
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uint64_t destination : 8;
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};
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struct
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{
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uint32_t lo_dword;
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uint32_t hi_dword;
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};
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};
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static uint32_t ReadLocalAPIC(uint32_t offset);
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static void WriteLocalAPIC(uint32_t offset, uint32_t value);
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static uint32_t ReadIOAPIC(uint8_t reg);
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static void WriteIOAPIC(uint8_t reg, uint32_t value);
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static void SetMSR(uint32_t msr, uint32_t lo, uint32_t hi);
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static bool IsRSDP(RSDPDescriptor* rsdp)
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{
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if (memcmp(rsdp->signature, "RSD PTR ", 8) != 0)
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return false;
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{
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uint8_t checksum = 0;
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for (uint32_t i = 0; i < sizeof(RSDPDescriptor); i++)
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checksum += ((uint8_t*)rsdp)[i];
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if (checksum != 0)
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return false;
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}
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if (rsdp->revision == 2)
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{
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RSDPDescriptor20* rsdp20 = (RSDPDescriptor20*)rsdp;
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uint8_t checksum = 0;
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for (uint32_t i = 0; i < sizeof(RSDPDescriptor20); i++)
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checksum += ((uint8_t*)rsdp20)[i];
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if (checksum != 0)
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return false;
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}
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return true;
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}
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static RSDPDescriptor* LocateRSDP()
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{
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// Look in main BIOS area below 1 MB
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for (uint32_t addr = 0x000E0000; addr < 0x000FFFFF; addr += 16)
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if (IsRSDP((RSDPDescriptor*)addr))
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return (RSDPDescriptor*)addr;
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return nullptr;
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}
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static bool IsValidACPISDTHeader(ACPISDTHeader* header)
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{
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uint8_t sum = 0;
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for (uint32_t i = 0; i < header->length; i++)
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sum += ((uint8_t*)header)[i];
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return sum == 0;
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}
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static void ParseMADT(RSDPDescriptor* rsdp)
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{
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RSDT* root = (RSDT*)(rsdp->revision == 2 ? ((RSDPDescriptor20*)rsdp)->xsdt_address : rsdp->rsdt_address);
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Paging::MapRSDP((uint32_t)root & 0xFFC00000);
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uint32_t sdt_entry_count = (root->header.length - sizeof(root->header)) / (rsdp->revision == 2 ? 8 : 4);
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for (uint32_t i = 0; i < sdt_entry_count; i++)
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{
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ACPISDTHeader* header = (ACPISDTHeader*)(rsdp->revision == 2 ? ((uint64_t*)root->sdt_pointer)[i] : root->sdt_pointer[i]);
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if (!IsValidACPISDTHeader(header))
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continue;
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if (memcmp(header->signature, "APIC", 4) == 0)
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{
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MADT* madt = (MADT*)header;
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s_local_apic = madt->local_apic;
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uint32_t entry_addr = (uint32_t)madt + sizeof(MADT);
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while (entry_addr < (uint32_t)madt + madt->header.length)
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{
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MADTEntry* entry = (MADTEntry*)entry_addr;
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switch (entry->type)
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{
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case 0:
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s_processor_ids[s_lapic_count] = entry->entry0.acpi_processor_id;
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s_lapic_ids[s_lapic_count] = entry->entry0.apic_id;
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s_lapic_count++;
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#if DEBUG_PRINT
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//kprintln("Entry0, processor id {}, apic id {}, flags 0b{32b}",
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// entry->entry0.acpi_processor_id,
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// entry->entry0.apic_id,
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// entry->entry0.flags
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//);
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#endif
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break;
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case 1:
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if (s_io_apic == 0)
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s_io_apic = entry->entry1.ioapic_address;
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#if DEBUG_PRINT
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kprintln("Entry1, io apic id {}, io apic address 0x{4H}, gsi base {}",
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entry->entry1.ioapic_id,
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entry->entry1.ioapic_address,
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entry->entry1.gsi_base
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);
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#endif
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break;
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case 2:
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s_overrides[entry->entry2.irq_source] = entry->entry2.gsi;
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#if DEBUG_PRINT
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kprintln("Entry2, bus source {}, irq source {}, gsi {}, flags 0b{16b}",
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entry->entry2.bus_source,
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entry->entry2.irq_source,
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entry->entry2.gsi,
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entry->entry2.flags
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);
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#endif
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break;
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case 3:
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#if DEBUG_PRINT
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kprintln("Entry3, nmi source {}, flags 0b{16b}, gsi {}",
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entry->entry3.nmi_source,
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entry->entry3.flags,
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entry->entry3.gsi
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);
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#endif
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break;
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case 4:
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#if DEBUG_PRINT
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kprintln("Entry4, acpi processor id 0x{2H}, flags 0b{16b}, lint{}",
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entry->entry4.acpi_processor_id,
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entry->entry4.flags,
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entry->entry4.lint
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);
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#endif
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break;
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case 5:
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s_local_apic = entry->entry5.address;
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#if DEBUG_PRINT
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kprintln("Entry5, address 0x{4H}",
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entry->entry5.address
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);
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#endif
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break;
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case 9:
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#if DEBUG_PRINT
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kprintln("Entry9, x2 acpi id {}, flags 0b{32b}, acpi id {}",
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entry->entry9.local_x2acpi_id,
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entry->entry9.flags,
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entry->entry9.acpi_id
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);
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#endif
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break;
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default:
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break;
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}
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entry_addr += entry->length;
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}
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}
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}
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}
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static uint32_t ReadLocalAPIC(uint32_t offset)
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{
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return *(uint32_t*)(s_local_apic + offset);
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}
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static void WriteLocalAPIC(uint32_t offset, uint32_t value)
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{
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Warray-bounds"
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*(uint32_t*)(s_local_apic + offset) = value;
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#pragma GCC diagnostic pop
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}
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static uint32_t ReadIOAPIC(uint8_t reg)
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{
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volatile uint32_t* ioapic = (volatile uint32_t*)s_io_apic;
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ioapic[0] = reg;
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return ioapic[4];
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}
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static void WriteIOAPIC(uint8_t reg, uint32_t value)
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{
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volatile uint32_t* ioapic = (volatile uint32_t*)s_io_apic;
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ioapic[0] = reg;
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ioapic[4] = value;
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}
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static void SetMSR(uint32_t msr, uint32_t lo, uint32_t hi)
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{
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asm volatile("wrmsr" : : "a"(lo), "d"(hi), "c"(msr));
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}
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static bool InitializeAPIC()
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{
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if (!CPUID::IsAvailable())
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{
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kprintln("CPUID not available");
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return false;
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}
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uint32_t ecx, edx;
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CPUID::GetFeatures(ecx, edx);
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if (!(edx & CPUID::Features::EDX_APIC))
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{
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kprintln("Local APIC not available");
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return false;
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}
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if (!(edx & CPUID::Features::EDX_MSR))
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{
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kprintln("MSR not available");
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return false;
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}
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RSDPDescriptor* rsdp = LocateRSDP();
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if (rsdp == nullptr)
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{
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kprintln("Could not locate RSDP");
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return false;
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}
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ParseMADT(rsdp);
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if (s_local_apic == 0 || s_io_apic == 0)
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return false;
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if ((s_io_apic & 0xFFC00000) != (s_local_apic & 0xFFC00000))
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Kernel::panic("lapic and ioapic are not in the same 4 MiB are");
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Paging::MapAPIC(s_io_apic & 0xFFC00000);
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// Enable Local APIC
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SetMSR(IA32_APIC_BASE, (s_local_apic & 0xFFFFF000) | IA32_APIC_BASE_ENABLE, 0);
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uint32_t sivr = ReadLocalAPIC(0xF0);
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WriteLocalAPIC(0xF0, sivr | 0x1FF);
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return true;
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}
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void Initialize(bool force_pic)
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{
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for (uint32_t i = 0x00; i <= 0xFF; i++)
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s_overrides[i] = i;
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PIC::MaskAll();
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PIC::Remap();
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if (force_pic)
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{
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kprintln("Using PIC instead of APIC");
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s_using_fallback_pic = true;
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}
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else if (!InitializeAPIC())
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{
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kprintln("Could not initialize APIC. Using PIC as fallback");
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s_using_fallback_pic = true;
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}
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}
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void EOI(uint8_t irq)
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{
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if (s_using_fallback_pic)
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return PIC::EOI(irq);
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WriteLocalAPIC(0xB0, 0);
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}
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void GetISR(uint32_t out[8])
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{
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if (s_using_fallback_pic)
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{
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memset(out, 0, sizeof(uint32_t) * 8);
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uint32_t addr = (uint32_t)out + IRQ_VECTOR_BASE / 8;
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*(uint16_t*)addr = PIC::GetISR();
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return;
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}
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for (uint32_t i = 0; i < 8; i++)
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out[i] = ReadLocalAPIC(0x100 + i * 0x10);
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}
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void EnableIRQ(uint8_t irq)
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{
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if (s_using_fallback_pic)
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return PIC::Unmask(irq);
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uint32_t gsi = s_overrides[irq];
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RedirectionEntry redir;
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redir.lo_dword = ReadIOAPIC(0x10 + gsi * 2);
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redir.hi_dword = ReadIOAPIC(0x10 + gsi * 2 + 1);
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redir.vector = IRQ_VECTOR_BASE + irq;
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redir.mask = 0;
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redir.destination = s_lapic_ids[0];
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WriteIOAPIC(0x10 + gsi * 2, redir.lo_dword);
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WriteIOAPIC(0x10 + gsi * 2 + 1, redir.hi_dword);
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}
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} |