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Locate the ACPI XSDT

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This commit is contained in:
Josh Holtrop 2022-10-17 21:48:43 -04:00
parent 2ee920fdd2
commit 7471a846ec
2 changed files with 37 additions and 0 deletions
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34
src/hello/hello.d
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@ -399,6 +399,33 @@ private void jump_to_hulk()
hulk_header().entry, hulk_virt_stack_top());
}
/**
* Find the ACPI XSDT.
*
* @return Whether it was found.
*/
private bool find_acpi_xsdt()
{
for (size_t i = 0u; i < st.NumberOfTableEntries; i++)
{
if ((st.ConfigurationTable[i].VendorGuid == EFI_ACPI_TABLE_GUID) ||
(st.ConfigurationTable[i].VendorGuid == ACPI_TABLE_GUID))
{
enum ulong rsdp_magic = 0x20525450_20445352u;
const(EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER) * rdsp = cast(const(EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER) *)st.ConfigurationTable[i].VendorTable;
if (rdsp.Signature == rsdp_magic)
{
if (rdsp.Revision >= EFI_ACPI_2_0_ROOT_SYSTEM_DESCRIPTION_POINTER_REVISION)
{
bootinfo().acpi_xsdt_phys = rdsp.XsdtAddress;
return true;
}
}
}
}
return false;
}
/**
* EFI application entry point.
*
@ -414,6 +441,13 @@ extern (C) EFI_STATUS efi_main(EFI_HANDLE image_handle, EFI_SYSTEM_TABLE * st)
console.writeln("Welcome to HELLO, HOS EFI Lightweight LOader, v0.1.0");
console.writeln("Firmware vendor: '%S', version: 0x%x", st.FirmwareVendor, st.FirmwareVendor);
if (!find_acpi_xsdt())
{
console.writeln("Error: Could not locate ACPI XSDT");
console.wait_key();
return EFI_SUCCESS;
}
bootinfo().pt_phys = cast(ulong)scratch.current();
if (!set_graphics_mode())

3
src/hulk/bootinfo.d
View File

@ -73,4 +73,7 @@ struct BootInfo
/* Size of page tables while jumping to HULK. */
ulong pt_size;
/* Physical address of ACPI XSDT table. */
ulong acpi_xsdt_phys;
}