forked from Bananymous/banan-os
Kernel: rewrite some of APIC since it didn't work with xsdts for some reason
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Bananymous
parent
35d2e27292
commit
e00d18029d
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@ -16,52 +16,38 @@
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// https://uefi.org/specs/ACPI/6.5/05_ACPI_Software_Programming_Model.html#multiple-apic-description-table-madt-format
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struct RSDPDescriptor
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static constexpr uint32_t RSPD_SIZE = 20;
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static constexpr uint32_t RSPDv2_SIZE = 36;
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struct RSDP
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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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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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uint32_t v2_length;
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uint64_t v2_xsdt_address;
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uint8_t v2_extended_checksum;
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uint8_t v2_reserved[3];
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} __attribute__ ((packed));
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struct RSDPDescriptor20
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struct SDTHeader
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{
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RSDPDescriptor first_part;
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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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char signature[4];
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uint32_t length;
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uint8_t revision;
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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 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 revision;
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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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SDTHeader 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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@ -122,14 +108,16 @@ union RedirectionEntry
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};
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};
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static bool IsRSDP(const RSDPDescriptor* rsdp)
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static bool IsRSDP(uintptr_t rsdp_addr)
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{
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const RSDP* rsdp = (const RSDP*)rsdp_addr;
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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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for (uint32_t i = 0; i < RSPD_SIZE; 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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@ -137,10 +125,9 @@ static bool IsRSDP(const RSDPDescriptor* rsdp)
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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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for (uint32_t i = 0; i < RSPDv2_SIZE; 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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@ -148,16 +135,16 @@ static bool IsRSDP(const RSDPDescriptor* rsdp)
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return true;
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}
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static const RSDPDescriptor* LocateRSDP()
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static uintptr_t LocateRSDP()
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{
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// Look in main BIOS area below 1 MB
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for (uintptr_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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if (IsRSDP(addr))
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return addr;
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return 0;
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}
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static bool IsValidACPISDTHeader(const ACPISDTHeader* header)
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static bool IsValidSDTHeader(const SDTHeader* 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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@ -165,39 +152,54 @@ static bool IsValidACPISDTHeader(const ACPISDTHeader* header)
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return sum == 0;
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}
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static const MADT* LocateMADT(const RSDPDescriptor* rsdp)
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uintptr_t LocateMADT(uintptr_t rsdp_addr)
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{
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uintptr_t root_addr = 0;
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uint32_t entry_count = 0;
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uintptr_t entry_address_base = 0;
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uintptr_t entry_address_mask = 0;
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ptrdiff_t entry_pointer_size = 0;
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uint32_t entry_count = 0;
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const RSDP* rsdp = (const RSDP*)rsdp_addr;
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if (rsdp->revision == 2)
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{
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const XSDT* root = (const XSDT*)((const RSDPDescriptor20*)rsdp)->xsdt_address;
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MMU::Get().AllocatePage((uintptr_t)root);
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entry_count = (root->header.length - sizeof(root->header)) / sizeof(*root->sdt_pointer);
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root_addr = (uintptr_t)root;
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uintptr_t xsdt_addr = rsdp->v2_xsdt_address;
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MMU::Get().AllocatePage(xsdt_addr);
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entry_address_base = xsdt_addr + sizeof(SDTHeader);
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entry_address_mask = (uintptr_t)0xFFFFFFFFFFFFFFFF;
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entry_count = (((const SDTHeader*)xsdt_addr)->length - sizeof(SDTHeader)) / 8;
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entry_pointer_size = 8;
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MMU::Get().UnAllocatePage(xsdt_addr);
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}
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else
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{
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const RSDT* root = (const RSDT*)(uintptr_t)rsdp->rsdt_address;
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MMU::Get().AllocatePage((uintptr_t)root);
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entry_count = (root->header.length - sizeof(root->header)) / sizeof(*root->sdt_pointer);
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root_addr = (uintptr_t)root;
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uintptr_t rsdt_addr = rsdp->rsdt_address;
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MMU::Get().AllocatePage(rsdt_addr);
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entry_address_base = rsdt_addr + sizeof(SDTHeader);
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entry_address_mask = 0xFFFFFFFF;
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entry_count = (((const SDTHeader*)rsdt_addr)->length - sizeof(SDTHeader)) / 4;
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entry_pointer_size = 4;
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MMU::Get().UnAllocatePage(rsdt_addr);
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}
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BAN::ScopeGuard guard([root_addr]() { MMU::Get().UnAllocatePage(root_addr); });
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for (uint32_t i = 0; i < entry_count; i++)
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{
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const ACPISDTHeader* header = nullptr;
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if (rsdp->revision == 2)
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header = (const ACPISDTHeader*)((const XSDT*)root_addr)->sdt_pointer[i];
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else
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header = (const ACPISDTHeader*)(uintptr_t)((const RSDT*)root_addr)->sdt_pointer[i];
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if (memcmp(header->signature, "APIC", 4) == 0 && IsValidACPISDTHeader(header))
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return (const MADT*)header;
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uintptr_t entry_addr_ptr = entry_address_base + i * entry_pointer_size;
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MMU::Get().AllocatePage(entry_addr_ptr);
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uintptr_t entry_addr = *(uintptr_t*)entry_addr_ptr & entry_address_mask;
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MMU::Get().AllocatePage(entry_addr);
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BAN::ScopeGuard _([&]() {
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MMU::Get().UnAllocatePage(entry_addr);
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MMU::Get().UnAllocatePage(entry_addr_ptr);
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});
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const SDTHeader* entry = (const SDTHeader*)entry_addr;
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if (memcmp(entry->signature, "APIC", 4) == 0 && IsValidSDTHeader(entry))
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return entry_addr;
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}
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return nullptr;
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return 0;
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}
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APIC* APIC::Create()
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@ -210,21 +212,23 @@ APIC* APIC::Create()
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return nullptr;
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}
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const RSDPDescriptor* rsdp = LocateRSDP();
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if (rsdp == nullptr)
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uintptr_t rsdp_addr = LocateRSDP();
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if (!rsdp_addr)
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{
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dprintln("Could not locate RSDP");
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return nullptr;
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}
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const MADT* madt = LocateMADT(rsdp);
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if (madt == nullptr)
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uintptr_t madt_addr = LocateMADT(rsdp_addr);
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if (!madt_addr)
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{
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dprintln("Could not find MADT in RSDP");
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return nullptr;
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}
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MMU::Get().AllocatePage((uintptr_t)madt);
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MMU::Get().AllocatePage(madt_addr);
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const MADT* madt = (const MADT*)madt_addr;
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APIC* apic = new APIC;
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apic->m_local_apic = madt->local_apic;
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