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[acpi] Expose ACPI tables via settings mechanism

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Allow values to be read from ACPI tables using the syntax

  ${acpi/<signature>.<index>.0.<offset>.<length>}

where <signature> is the ACPI table signature as a 32-bit hexadecimal
number (e.g. 0x41504093 for the 'APIC' signature on the MADT), <index>
is the index into the array of tables matching this signature,
<offset> is the byte offset within the table, and <length> is the
field length in bytes.

Numeric values are returned in reverse byte order, since ACPI numeric
values are usually little-endian.

For example:

  ${acpi/0x41504943.0.0.0.0}           - entire MADT table in raw hex
  ${acpi/0x41504943.0.0.0x0a.6:string} - MADT table OEM ID
  ${acpi/0x41504943.0.0.0x24.4:uint32} - local APIC address

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2017-05-23 15:44:22 +01:00
parent 993fd2b451
commit 356f6c1b64
4 changed files with 166 additions and 0 deletions
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src/include/ipxe/errfile.h
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@@ -366,6 +366,7 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#define ERRFILE_efi_local ( ERRFILE_OTHER | 0x004d0000 )
#define ERRFILE_efi_entropy ( ERRFILE_OTHER | 0x004e0000 )
#define ERRFILE_cert_cmd ( ERRFILE_OTHER | 0x004f0000 )
#define ERRFILE_acpi_settings ( ERRFILE_OTHER | 0x00500000 )
/** @} */