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// Copyright 2022 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
use acpi_tables::aml;
use acpi_tables::aml::Aml;
use anyhow::anyhow;
use anyhow::Result;
use base::MemoryMapping;
use base::MemoryMappingBuilder;
use base::Protection;
use base::SharedMemory;
pub const SHM_OFFSET: u32 = 0x1000;
pub const SHM_SIZE: u32 = 0x1000;
pub struct DeviceVcfgRegister {
offset: u32,
shm: SharedMemory,
}
impl DeviceVcfgRegister {
pub fn new(offset: u32) -> Result<DeviceVcfgRegister> {
let shm = SharedMemory::new("VCFG register", SHM_SIZE as u64)
.map_err(|_| anyhow!("failed to create shared memory"))?;
Ok(DeviceVcfgRegister { offset, shm })
}
pub fn create_shm_mmap(&self) -> Option<MemoryMapping> {
MemoryMappingBuilder::new(SHM_SIZE as usize)
.from_shared_memory(&self.shm)
.offset(0)
.protection(Protection::read_write())
.build()
.ok()
}
}
impl Aml for DeviceVcfgRegister {
fn to_aml_bytes(&self, bytes: &mut Vec<u8>) {
aml::OpRegion::new(
"VREG".into(),
aml::OpRegionSpace::SystemMemory,
&aml::Add::new(&aml::ZERO, &aml::Name::new_field_name("VCFG"), &self.offset),
&4096_usize,
)
.to_aml_bytes(bytes);
aml::Field::new(
"VREG".into(),
aml::FieldAccessType::DWord,
aml::FieldLockRule::Lock,
aml::FieldUpdateRule::Preserve,
vec![
aml::FieldEntry::Named(*b"PFPM", 32),
aml::FieldEntry::Named(*b"PDSM", 32),
aml::FieldEntry::Named(*b"NOTY", 32),
],
)
.to_aml_bytes(bytes);
aml::OpRegion::new(
"SHAM".into(),
aml::OpRegionSpace::SystemMemory,
&aml::Add::new(
&aml::ZERO,
&aml::Name::new_field_name("VCFG"),
&(self.offset + SHM_OFFSET),
),
&SHM_SIZE,
)
.to_aml_bytes(bytes);
aml::Field::new(
"SHAM".into(),
aml::FieldAccessType::Any,
aml::FieldLockRule::Lock,
aml::FieldUpdateRule::Preserve,
vec![
aml::FieldEntry::Named(*b"DSM0", 128),
aml::FieldEntry::Named(*b"DSM1", 64),
aml::FieldEntry::Named(*b"DSM2", 64),
aml::FieldEntry::Named(*b"DSM3", 16384),
],
)
.to_aml_bytes(bytes);
aml::Field::new(
"SHAM".into(),
aml::FieldAccessType::DWord,
aml::FieldLockRule::Lock,
aml::FieldUpdateRule::Preserve,
vec![
aml::FieldEntry::Reserved(256),
aml::FieldEntry::Named(*b"RTTP", 32),
aml::FieldEntry::Named(*b"RTSZ", 32),
aml::FieldEntry::Named(*b"RTDT", 16576),
],
)
.to_aml_bytes(bytes);
}
}
pub struct DsmMethod {}
const ACPI_TYPE_INT: &dyn Aml = &1_usize;
const ACPI_TYPE_STRING: &dyn Aml = &2_usize;
const ACPI_TYPE_BUFFER: &dyn Aml = &3_usize;
const ACPI_TYPE_PACKAGE: &dyn Aml = &4_usize;
// The ACPI _DSM methods are described under:
// https://uefi.org/htmlspecs/ACPI_Spec_6_4_html/09_ACPI-Defined_Devices_and_Device-Specific_Objects/ACPIdefined_Devices_and_DeviceSpecificObjects.html?highlight=_dsm#dsm-device-specific-method
//
// Since the guest does not have access to native ACPI tables, whenever native driver for the
// pass-through device, which resides in guest, evaluates _DSM methods, such evaluation needs to be
// propagated to the host which can do the actual job.
//
// Below snippet generates AML code, which implements virtual _DSM method in guest ACPI tables.
// Its role is to collect and pass guest _DSM arguments into host (through shared memory). When all
// arguments are saved in shared memory, access to PDSM is issued which causes a trap to VMM. As a
// consequence VMM can read passed _DSM arguments and pass them further (through dedicated IOCTL)
// to the host kernel, which can actually evaluate the ACPI _DSM method using native tables. The
// results are passed back from ioctl to VMM and further to the guest through shared memory.
impl Aml for DsmMethod {
fn to_aml_bytes(&self, aml: &mut Vec<u8>) {
aml::Method::new(
"_DSM".into(),
4,
true,
vec![
&aml::Store::new(&aml::Name::new_field_name("DSM0"), &aml::Arg(0)),
&aml::Store::new(&aml::Name::new_field_name("DSM1"), &aml::Arg(1)),
&aml::Store::new(&aml::Name::new_field_name("DSM2"), &aml::Arg(2)),
&aml::Store::new(&aml::Local(2), &aml::ObjectType::new(&aml::Arg(3))),
&aml::Store::new(&aml::Local(1), &aml::SizeOf::new(&aml::Arg(3))),
&aml::Store::new(&aml::Local(0), &aml::BufferTerm::new(&16384_usize)),
&aml::If::new(
&aml::Equal::new(&aml::Local(2), ACPI_TYPE_BUFFER),
vec![
&aml::CreateDWordField::new(
&aml::Name::new_field_name("BFTP"),
&aml::Local(0),
&0_usize,
),
&aml::CreateDWordField::new(
&aml::Name::new_field_name("BFSZ"),
&aml::Local(0),
&4_usize,
),
&aml::CreateField::new(
&aml::Name::new_field_name("BFDT"),
&aml::Local(0),
&(8_usize * 8_usize),
&aml::Multiply::new(&aml::ZERO, &aml::Local(1), &8_usize),
),
&aml::Store::new(&aml::Name::new_field_name("BFTP"), ACPI_TYPE_BUFFER),
&aml::Store::new(&aml::Name::new_field_name("BFSZ"), &aml::Local(1)),
&aml::Store::new(&aml::Name::new_field_name("BFDT"), &aml::Arg(3)),
],
),
&aml::Else::new(vec![
&aml::If::new(
&aml::Equal::new(&aml::Local(2), ACPI_TYPE_PACKAGE),
vec![
&aml::Store::new(&aml::Local(5), &aml::ZERO),
&aml::CreateDWordField::new(
&aml::Name::new_field_name("PKTP"),
&aml::Local(0),
&aml::Local(5),
),
&aml::Store::new(&aml::Name::new_field_name("PKTP"), ACPI_TYPE_PACKAGE),
&aml::Add::new(&aml::Local(5), &aml::Local(5), &4_usize),
&aml::CreateDWordField::new(
&aml::Name::new_field_name("PKSZ"),
&aml::Local(0),
&aml::Local(5),
),
&aml::Store::new(&aml::Name::new_field_name("PKSZ"), &aml::Local(1)),
&aml::Add::new(&aml::Local(5), &aml::Local(5), &4_usize),
&aml::Store::new(&aml::Local(2), &aml::ZERO),
&aml::While::new(
&aml::LessThan::new(&aml::Local(2), &aml::Local(1)),
vec![
&aml::Store::new(
&aml::Local(3),
&aml::DeRefOf::new(&aml::Index::new(
&aml::ZERO,
&aml::Arg(3),
&aml::Local(2),
)),
),
&aml::Store::new(
&aml::Local(4),
&aml::ObjectType::new(&aml::Local(3)),
),
&aml::Store::new(
&aml::Local(6),
&aml::SizeOf::new(&aml::Local(3)),
),
&aml::CreateDWordField::new(
&aml::Name::new_field_name("OUTP"),
&aml::Local(0),
&aml::Local(5),
),
&aml::Store::new(
&aml::Name::new_field_name("OUTP"),
&aml::Local(4),
),
&aml::Add::new(&aml::Local(5), &aml::Local(5), &4_usize),
&aml::CreateDWordField::new(
&aml::Name::new_field_name("OUSZ"),
&aml::Local(0),
&aml::Local(5),
),
&aml::Store::new(
&aml::Name::new_field_name("OUSZ"),
&aml::Local(6),
),
&aml::Add::new(&aml::Local(5), &aml::Local(5), &4_usize),
&aml::If::new(
&aml::Equal::new(&aml::Local(4), ACPI_TYPE_INT),
vec![
&aml::CreateQWordField::new(
&aml::Name::new_field_name("OUDT"),
&aml::Local(0),
&aml::Local(5),
),
&aml::Store::new(
&aml::Name::new_field_name("OUDT"),
&aml::Local(3),
),
&aml::Add::new(
&aml::Local(5),
&aml::Local(5),
&8_usize,
),
],
),
&aml::Else::new(vec![
&aml::If::new(
&aml::Equal::new(&aml::Local(4), ACPI_TYPE_STRING),
vec![
&aml::CreateField::new(
&aml::Name::new_field_name("OSDT"),
&aml::Local(0),
&aml::Multiply::new(
&aml::ZERO,
&aml::Local(5),
&8_usize,
),
&aml::Multiply::new(
&aml::ZERO,
&aml::Local(6),
&8_usize,
),
),
&aml::Store::new(
&aml::Name::new_field_name("OSDT"),
&aml::Local(3),
),
&aml::And::new(
&aml::Local(7),
&aml::Local(6),
&7_usize,
),
&aml::If::new(
&aml::NotEqual::new(&aml::Local(7), &aml::ZERO),
vec![&aml::Add::new(
&aml::Local(6),
&aml::Local(6),
&8_usize,
)],
),
&aml::Subtract::new(
&aml::Local(6),
&aml::Local(6),
&aml::Local(7),
),
&aml::Add::new(
&aml::Local(5),
&aml::Local(5),
&aml::Local(6),
),
],
),
&aml::Else::new(vec![&aml::If::new(
&aml::Equal::new(&aml::Local(4), ACPI_TYPE_BUFFER),
vec![
&aml::CreateField::new(
&aml::Name::new_field_name("OBDT"),
&aml::Local(0),
&aml::Multiply::new(
&aml::ZERO,
&aml::Local(5),
&8_usize,
),
&aml::Multiply::new(
&aml::ZERO,
&aml::Local(6),
&8_usize,
),
),
&aml::Store::new(
&aml::Name::new_field_name("OBDT"),
&aml::Local(3),
),
&aml::And::new(
&aml::Local(7),
&aml::Local(6),
&7_usize,
),
&aml::If::new(
&aml::NotEqual::new(&aml::Local(7), &aml::ZERO),
vec![&aml::Add::new(
&aml::Local(6),
&aml::Local(6),
&8_usize,
)],
),
&aml::Subtract::new(
&aml::Local(6),
&aml::Local(6),
&aml::Local(7),
),
&aml::Add::new(
&aml::Local(5),
&aml::Local(5),
&aml::Local(6),
),
],
)]),
]),
&aml::Add::new(&aml::Local(2), &aml::Local(2), &aml::ONE),
],
),
],
),
&aml::Else::new(vec![&aml::Return::new(&aml::ZERO)]),
]),
&aml::Store::new(&aml::Name::new_field_name("DSM3"), &aml::Local(0)),
// All DSM arguments are written to shared memory, lets access PDSM which will trap
// to VMM which can process it further. The result will be stored in shared memory.
&aml::Store::new(&aml::Name::new_field_name("PDSM"), &aml::ZERO),
// Lets start converting the _DSM result stored in shared memory into proper format
// which will allow to return result in desired format to the guest caller.
&aml::Store::new(
&aml::Local(0),
&aml::ToInteger::new(&aml::ZERO, &aml::Name::new_field_name("RTTP")),
),
&aml::If::new(
&aml::Equal::new(&aml::Local(0), ACPI_TYPE_INT),
vec![&aml::Return::new(&aml::ToInteger::new(
&aml::ZERO,
&aml::Name::new_field_name("RTDT"),
))],
),
&aml::Else::new(vec![
&aml::If::new(
&aml::Equal::new(&aml::Local(0), ACPI_TYPE_STRING),
vec![&aml::Return::new(&aml::ToString::new(
&aml::ZERO,
&aml::Name::new_field_name("RTDT"),
&aml::ONES,
))],
),
&aml::Else::new(vec![
&aml::If::new(
&aml::Equal::new(&aml::Local(0), ACPI_TYPE_BUFFER),
vec![&aml::Return::new(&aml::Mid::new(
&aml::Name::new_field_name("RTDT"),
&0_usize,
&aml::ToInteger::new(
&aml::ZERO,
&aml::Name::new_field_name("RTSZ"),
),
&aml::ZERO,
))],
),
&aml::Else::new(vec![
&aml::If::new(
&aml::Equal::new(&aml::Local(0), ACPI_TYPE_PACKAGE),
vec![
&aml::Store::new(&aml::Local(0), &aml::ZERO),
&aml::Store::new(
&aml::Local(1),
&aml::ToInteger::new(
&aml::ZERO,
&aml::Name::new_field_name("RTSZ"),
),
),
&aml::Store::new(
&aml::Local(2),
&aml::VarPackageTerm::new(&aml::Local(1)),
),
&aml::Store::new(&aml::Local(3), &aml::ZERO),
&aml::While::new(
&aml::LessThan::new(&aml::Local(0), &aml::Local(1)),
vec![
&aml::Store::new(
&aml::Local(4),
&aml::ToInteger::new(
&aml::ZERO,
&aml::Mid::new(
&aml::Name::new_field_name("RTDT"),
&aml::Local(3),
&4_usize,
&aml::ZERO,
),
),
),
&aml::Add::new(
&aml::Local(3),
&aml::Local(3),
&4_usize,
),
&aml::Store::new(
&aml::Local(5),
&aml::ToInteger::new(
&aml::ZERO,
&aml::Mid::new(
&aml::Name::new_field_name("RTDT"),
&aml::Local(3),
&4_usize,
&aml::ZERO,
),
),
),
&aml::Add::new(
&aml::Local(3),
&aml::Local(3),
&4_usize,
),
&aml::Store::new(
&aml::Local(6),
&aml::Mid::new(
&aml::Name::new_field_name("RTDT"),
&aml::Local(3),
&aml::Local(5),
&aml::ZERO,
),
),
&aml::Add::new(
&aml::Local(3),
&aml::Local(3),
&aml::Local(5),
),
&aml::If::new(
&aml::Equal::new(&aml::Local(4), ACPI_TYPE_INT),
vec![&aml::Store::new(
&aml::Local(6),
&aml::ToInteger::new(
&aml::ZERO,
&aml::Local(6),
),
)],
),
&aml::Else::new(vec![&aml::If::new(
&aml::Equal::new(&aml::Local(4), ACPI_TYPE_STRING),
vec![&aml::Store::new(
&aml::Local(6),
&aml::ToString::new(
&aml::ZERO,
&aml::Local(6),
&aml::ONES,
),
)],
)]),
&aml::Store::new(
&aml::Index::new(
&aml::ZERO,
&aml::Local(2),
&aml::Local(0),
),
&aml::Local(6),
),
&aml::Add::new(
&aml::Local(0),
&aml::Local(0),
&aml::ONE,
),
],
),
&aml::Return::new(&aml::Local(2)),
],
),
&aml::Else::new(vec![&aml::Return::new(&aml::ZERO)]),
]),
]),
]),
],
)
.to_aml_bytes(aml);
}
}
pub struct PowerResourceMethod {}
impl Aml for PowerResourceMethod {
fn to_aml_bytes(&self, aml: &mut Vec<u8>) {
aml::PowerResource::new(
"PRIC".into(),
0u8,
0u16,
vec![
&aml::Name::new("_STA".into(), &aml::ONE),
&aml::Method::new(
"_ON_".into(),
0,
true,
vec![
&aml::Store::new(&aml::Name::new_field_name("PFPM"), &aml::ONE),
&aml::Store::new(&aml::Name::new_field_name("_STA"), &aml::ONE),
],
),
&aml::Method::new(
"_OFF".into(),
0,
true,
vec![
&aml::Store::new(&aml::Name::new_field_name("_STA"), &aml::ZERO),
&aml::Store::new(&aml::Name::new_field_name("PFPM"), &aml::ZERO),
],
),
],
)
.to_aml_bytes(aml);
aml::Name::new(
"_PR0".into(),
&aml::Package::new(vec![&aml::Name::new_field_name("PRIC")]),
)
.to_aml_bytes(aml);
aml::Name::new(
"_PR3".into(),
&aml::Package::new(vec![&aml::Name::new_field_name("PRIC")]),
)
.to_aml_bytes(aml);
}
}
pub struct GpeScope {}
impl GpeScope {
pub fn cast_to_aml_bytes(&self, aml: &mut Vec<u8>, gpe_nr: u32, notification_path: &str) {
aml::Scope::new(
"_GPE".into(),
vec![&aml::Method::new(
format!("_E{:02X}", gpe_nr).as_str().into(),
0,
false,
vec![
&aml::Store::new(
&aml::Local(0),
&aml::Path::new(format!("{}.NOTY", notification_path).as_str()),
),
&aml::Notify::new(&aml::Path::new(notification_path), &aml::Local(0)),
],
)],
)
.to_aml_bytes(aml);
}
}