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Kernel/ACPI: Sprinkle links to the specification all over

Browse Source 
The latest version of the ACPI specification (6.4) now has a web
version, making it possible to link directly to the relevant sections
of the specification.

I added links to the stuff that was easy to find.

The spec can be found here: https://uefi.org/specs/ACPI/6.4/index.html
This commit is contained in:
Luke 2021-05-31 18:25:27 +01:00 committed by Linus Groh
parent 10ba6f254c
commit 4ee58d36c0
Notes: sideshowbarker 2024-07-18 17:05:54 +09:00 
Author: https://github.com/Lubrsi
Commit: https://github.com/SerenityOS/serenity/commit/4ee58d36c0a
Pull-request: https://github.com/SerenityOS/serenity/pull/7637
2 changed files with 21 additions and 2 deletions
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16
Kernel/ACPI/Definitions.h
View File

@ -16,6 +16,8 @@ namespace Kernel {
namespace ACPI {
namespace FADTFlags {
// https://uefi.org/specs/ACPI/6.4/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#fixed-acpi-description-table-fixed-feature-flags
enum class FeatureFlags : u32 {
WBINVD = 1 << 0,
WBINVD_FLUSH = 1 << 1,
@ -41,6 +43,7 @@ enum class FeatureFlags : u32 {
LOW_POWER_S0_IDLE_CAPABLE = 1 << 21
};
// https://uefi.org/specs/ACPI/6.4/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#fixed-acpi-description-table-boot-ia-pc-boot-architecture-flags
enum class IA_PC_Flags : u8 {
Legacy_Devices = 1 << 0,
PS2_8042 = 1 << 1,
@ -110,6 +113,8 @@ enum class BitWidth {
}
namespace Structures {
// https://uefi.org/specs/ACPI/6.4/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#root-system-description-pointer-rsdp-structure
struct [[gnu::packed]] RSDPDescriptor {
char sig[8];
u8 checksum;
@ -126,6 +131,7 @@ struct [[gnu::packed]] RSDPDescriptor20 {
u8 reserved[3];
};
// https://uefi.org/specs/ACPI/6.4/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#system-description-table-header
struct [[gnu::packed]] SDTHeader {
char sig[4];
u32 length;
@ -138,11 +144,13 @@ struct [[gnu::packed]] SDTHeader {
u32 creator_revision;
};
// https://uefi.org/specs/ACPI/6.4/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#root-system-description-table-rsdt
struct [[gnu::packed]] RSDT {
SDTHeader h;
u32 table_ptrs[];
};
// https://uefi.org/specs/ACPI/6.4/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#extended-system-description-table-xsdt
struct [[gnu::packed]] XSDT {
SDTHeader h;
u64 table_ptrs[];
@ -167,6 +175,7 @@ struct [[gnu::packed]] HPET {
u8 page_protection;
};
// https://uefi.org/specs/ACPI/6.4/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#fixed-acpi-description-table-fadt
struct [[gnu::packed]] FADT {
SDTHeader h;
u32 firmware_ctrl;
@ -225,6 +234,8 @@ struct [[gnu::packed]] FADT {
GenericAddressStructure sleep_status;
u64 hypervisor_vendor_identity;
};
// https://uefi.org/specs/ACPI/6.4/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#interrupt-controller-structure-types
enum class MADTEntryType {
LocalAPIC = 0x0,
IOAPIC = 0x1,
@ -250,6 +261,8 @@ struct [[gnu::packed]] MADTEntryHeader {
};
namespace MADTEntries {
// https://uefi.org/specs/ACPI/6.4/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#i-o-apic-structure
struct [[gnu::packed]] IOAPIC {
MADTEntryHeader h;
u8 ioapic_id;
@ -258,6 +271,7 @@ struct [[gnu::packed]] IOAPIC {
u32 gsi_base;
};
// https://uefi.org/specs/ACPI/6.4/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#processor-local-apic-structure
struct [[gnu::packed]] ProcessorLocalAPIC {
MADTEntryHeader h;
u8 acpi_processor_id;
@ -265,6 +279,7 @@ struct [[gnu::packed]] ProcessorLocalAPIC {
u32 flags;
};
// https://uefi.org/specs/ACPI/6.4/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#interrupt-source-override-structure
struct [[gnu::packed]] InterruptSourceOverride {
MADTEntryHeader h;
u8 bus;
@ -274,6 +289,7 @@ struct [[gnu::packed]] InterruptSourceOverride {
};
}
// https://uefi.org/specs/ACPI/6.4/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#multiple-apic-description-table-madt-format
struct [[gnu::packed]] MADT {
SDTHeader h;
u32 lapic_address;

7
Kernel/ACPI/Parser.cpp
View File

@ -169,7 +169,8 @@ void Parser::access_generic_address(const Structures::GenericAddressStructure& s
return;
}
case GenericAddressStructure::AddressSpace::PCIConfigurationSpace: {
// According to the ACPI specification 6.2, page 168, PCI addresses must be confined to devices on Segment group 0, bus 0.
// According to https://uefi.org/specs/ACPI/6.4/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#address-space-format,
// PCI addresses must be confined to devices on Segment group 0, bus 0.
auto pci_address = PCI::Address(0, 0, ((structure.address >> 24) & 0xFF), ((structure.address >> 16) & 0xFF));
dbgln("ACPI: Sending value {:x} to {}", value, pci_address);
u32 offset_in_pci_address = structure.address & 0xFFFF;
@ -189,7 +190,8 @@ void Parser::access_generic_address(const Structures::GenericAddressStructure& s
bool Parser::validate_reset_register()
{
// According to the ACPI spec 6.2, page 152, The reset register can only be located in I/O bus, PCI bus or memory-mapped.
// According to https://uefi.org/specs/ACPI/6.4/04_ACPI_Hardware_Specification/ACPI_Hardware_Specification.html#reset-register,
// the reset register can only be located in I/O bus, PCI bus or memory-mapped.
auto fadt = map_typed<Structures::FADT>(m_fadt);
return (fadt->reset_reg.address_space == (u8)GenericAddressStructure::AddressSpace::PCIConfigurationSpace || fadt->reset_reg.address_space == (u8)GenericAddressStructure::AddressSpace::SystemMemory || fadt->reset_reg.address_space == (u8)GenericAddressStructure::AddressSpace::SystemIO);
}
@ -297,6 +299,7 @@ static bool validate_table(const Structures::SDTHeader& v_header, size_t length)
return false;
}
// https://uefi.org/specs/ACPI/6.4/05_ACPI_Software_Programming_Model/ACPI_Software_Programming_Model.html#finding-the-rsdp-on-ia-pc-systems
UNMAP_AFTER_INIT Optional<PhysicalAddress> StaticParsing::find_rsdp()
{
StringView signature("RSD PTR ");