109 lines
3.2 KiB
D
109 lines
3.2 KiB
D
/**
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* ACPI (Advanced Configuration and Power Interface) functionality.
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*/
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module hulk.acpi;
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import hulk.hurl;
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import hulk.klog;
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import hulk.memory;
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struct Acpi
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{
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enum uint APIC_SIGNATURE = 0x43495041u;
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enum uint XSDT_SIGNATURE = 0x54445358u;
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static struct XsdtHeader
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{
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uint signature;
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uint length;
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ubyte revision;
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ubyte checksum;
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char[6] oemid;
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ulong oemtableid;
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uint oem_revision;
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uint creator_id;
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uint creator_revision;
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}
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static struct Xsdt
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{
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XsdtHeader header;
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uint _pad;
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ulong[0] tables;
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}
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static struct MadtHeader
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{
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uint signature;
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uint length;
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ubyte revision;
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ubyte checksum;
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char[6] oemid;
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ulong oemtableid;
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uint oem_revision;
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uint creator_id;
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uint creator_revision;
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uint local_apic_address;
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uint flags;
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}
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static struct MadtEntry
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{
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ubyte type;
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ubyte length;
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}
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public static __gshared ulong apic_address;
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public static void initialize(ulong acpi_xsdt_phys)
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{
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/* Map the XSDT header. */
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Hurl.identity_map_range(acpi_xsdt_phys, Xsdt.sizeof, 0u);
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const(Xsdt) * xsdt = cast(const(Xsdt) *)acpi_xsdt_phys;
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if (xsdt.header.signature != XSDT_SIGNATURE)
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{
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Klog.writef("XSDT signature invalid\n");
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return;
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}
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/* Map the entire XSDT. */
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Hurl.identity_map_range(acpi_xsdt_phys, xsdt.header.length, 0u);
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size_t n_entries = (xsdt.header.length - xsdt.header.sizeof) / xsdt.tables[0].sizeof;
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for (size_t i = 0u; i < n_entries; i++)
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{
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ulong address = xsdt.tables[i];
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Hurl.identity_map_range(address, 4u, 0u);
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uint signature = *cast(const(uint) *)address;
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if (signature == APIC_SIGNATURE)
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{
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parse_apic_table(address);
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}
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Klog.writefln("Found ACPI table %08x (%c%c%c%c)",
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signature,
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signature & 0xFFu,
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(signature >> 8u) & 0xFFu,
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(signature >> 16u) & 0xFFu,
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(signature >> 24u) & 0xFFu);
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}
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}
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private static parse_apic_table(ulong address)
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{
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const(MadtHeader) * madt_header = cast(const(MadtHeader) *)address;
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Hurl.identity_map_range(address, madt_header.length, 0u);
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apic_address = madt_header.local_apic_address;
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Klog.writefln("Found 32-bit APIC address: 0x%x", apic_address);
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const(void) * madt_end = cast(const(void) *)(address + madt_header.length);
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const(MadtEntry) * madt_entry = cast(const(MadtEntry) *)(address + 0x2Cu);
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while (madt_entry < madt_end)
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{
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madt_entry = cast(const(MadtEntry) *)(cast(size_t)madt_entry + madt_entry.length);
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if (madt_entry.type == 5u)
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{
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/* Found a 64-bit Local APIC Address Override entry. */
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memcpy(cast(void *)&apic_address, cast(const(void) *)madt_entry + 4u, 8u);
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Klog.writefln("Found 64-bit APIC address: 0x%x", apic_address);
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}
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}
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}
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}
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