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Commit b693d0b3 authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab Committed by Jonathan Corbet
Browse files

docs: arm64: convert docs to ReST and rename to .rst 



The documentation is in a format that is very close to ReST format.

The conversion is actually:
  - add blank lines in order to identify paragraphs;
  - fixing tables markups;
  - adding some lists markups;
  - marking literal blocks;
  - adjust some title markups.

At its new index.rst, let's add a :orphan: while this is not linked to
the main index.rst file, in order to avoid build warnings.

Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
parent 305a99eb

Documentation/arm64/acpi_object_usage.txt→Documentation/arm64/acpi_object_usage.rst

+202 −86
Original line number Diff line number Diff line 
===========

ACPI Tables

-----------

===========



The expectations of individual ACPI tables are discussed in the list that

follows.
@@ -11,54 +13,71 @@ outside of the UEFI Forum (see Section 5.2.6 of the specification). 


For ACPI on arm64, tables also fall into the following categories:



       -- Required: DSDT, FADT, GTDT, MADT, MCFG, RSDP, SPCR, XSDT

       -  Required: DSDT, FADT, GTDT, MADT, MCFG, RSDP, SPCR, XSDT



       -- Recommended: BERT, EINJ, ERST, HEST, PCCT, SSDT

       -  Recommended: BERT, EINJ, ERST, HEST, PCCT, SSDT



       -- Optional: BGRT, CPEP, CSRT, DBG2, DRTM, ECDT, FACS, FPDT, IORT,

       -  Optional: BGRT, CPEP, CSRT, DBG2, DRTM, ECDT, FACS, FPDT, IORT,

          MCHI, MPST, MSCT, NFIT, PMTT, RASF, SBST, SLIT, SPMI, SRAT, STAO,

	  TCPA, TPM2, UEFI, XENV



       -- Not supported: BOOT, DBGP, DMAR, ETDT, HPET, IBFT, IVRS, LPIT,

       -  Not supported: BOOT, DBGP, DMAR, ETDT, HPET, IBFT, IVRS, LPIT,

          MSDM, OEMx, PSDT, RSDT, SLIC, WAET, WDAT, WDRT, WPBT



====== ========================================================================

Table  Usage for ARMv8 Linux

-----  ----------------------------------------------------------------

====== ========================================================================

BERT   Section 18.3 (signature == "BERT")

       == Boot Error Record Table ==



       **Boot Error Record Table**



       Must be supplied if RAS support is provided by the platform.  It

       is recommended this table be supplied.



BOOT   Signature Reserved (signature == "BOOT")

       == simple BOOT flag table ==



       **simple BOOT flag table**



       Microsoft only table, will not be supported.



BGRT   Section 5.2.22 (signature == "BGRT")

       == Boot Graphics Resource Table ==



       **Boot Graphics Resource Table**



       Optional, not currently supported, with no real use-case for an

       ARM server.



CPEP   Section 5.2.18 (signature == "CPEP")

       == Corrected Platform Error Polling table ==



       **Corrected Platform Error Polling table**



       Optional, not currently supported, and not recommended until such

       time as ARM-compatible hardware is available, and the specification

       suitably modified.



CSRT   Signature Reserved (signature == "CSRT")

       == Core System Resources Table ==



       **Core System Resources Table**



       Optional, not currently supported.



DBG2   Signature Reserved (signature == "DBG2")

       == DeBuG port table 2 ==



       **DeBuG port table 2**



       License has changed and should be usable.  Optional if used instead

       of earlycon=<device> on the command line.



DBGP   Signature Reserved (signature == "DBGP")

       == DeBuG Port table ==



       **DeBuG Port table**



       Microsoft only table, will not be supported.



DSDT   Section 5.2.11.1 (signature == "DSDT")

       == Differentiated System Description Table ==



       **Differentiated System Description Table**



       A DSDT is required; see also SSDT.



       ACPI tables contain only one DSDT but can contain one or more SSDTs,
@@ -66,22 +85,30 @@ DSDT Section 5.2.11.1 (signature == "DSDT") 
       but cannot modify or replace anything in the DSDT.



DMAR   Signature Reserved (signature == "DMAR")

       == DMA Remapping table ==



       **DMA Remapping table**



       x86 only table, will not be supported.



DRTM   Signature Reserved (signature == "DRTM")

       == Dynamic Root of Trust for Measurement table ==



       **Dynamic Root of Trust for Measurement table**



       Optional, not currently supported.



ECDT   Section 5.2.16 (signature == "ECDT")

       == Embedded Controller Description Table ==



       **Embedded Controller Description Table**



       Optional, not currently supported, but could be used on ARM if and

       only if one uses the GPE_BIT field to represent an IRQ number, since

       there are no GPE blocks defined in hardware reduced mode.  This would

       need to be modified in the ACPI specification.



EINJ   Section 18.6 (signature == "EINJ")

       == Error Injection table ==



       **Error Injection table**



       This table is very useful for testing platform response to error

       conditions; it allows one to inject an error into the system as

       if it had actually occurred.  However, this table should not be
@@ -89,27 +116,35 @@ EINJ Section 18.6 (signature == "EINJ") 
       and executed with the ACPICA tools only during testing.



ERST   Section 18.5 (signature == "ERST")

       == Error Record Serialization Table ==



       **Error Record Serialization Table**



       On a platform supports RAS, this table must be supplied if it is not

       UEFI-based; if it is UEFI-based, this table may be supplied. When this

       table is not present, UEFI run time service will be utilized to save

       and retrieve hardware error information to and from a persistent store.



ETDT   Signature Reserved (signature == "ETDT")

       == Event Timer Description Table ==



       **Event Timer Description Table**



       Obsolete table, will not be supported.



FACS   Section 5.2.10 (signature == "FACS")

       == Firmware ACPI Control Structure ==



       **Firmware ACPI Control Structure**



       It is unlikely that this table will be terribly useful.  If it is

       provided, the Global Lock will NOT be used since it is not part of

       the hardware reduced profile, and only 64-bit address fields will

       be considered valid.



FADT   Section 5.2.9 (signature == "FACP")

       == Fixed ACPI Description Table ==



       **Fixed ACPI Description Table**

       Required for arm64.





       The HW_REDUCED_ACPI flag must be set.  All of the fields that are

       to be ignored when HW_REDUCED_ACPI is set are expected to be set to

       zero.
@@ -118,22 +153,28 @@ FADT Section 5.2.9 (signature == "FACP") 
       used, not FIRMWARE_CTRL.



       If PSCI is used (as is recommended), make sure that ARM_BOOT_ARCH is

       filled in properly -- that the PSCI_COMPLIANT flag is set and that

       filled in properly - that the PSCI_COMPLIANT flag is set and that

       PSCI_USE_HVC is set or unset as needed (see table 5-37).



       For the DSDT that is also required, the X_DSDT field is to be used,

       not the DSDT field.



FPDT   Section 5.2.23 (signature == "FPDT")

       == Firmware Performance Data Table ==



       **Firmware Performance Data Table**



       Optional, not currently supported.



GTDT   Section 5.2.24 (signature == "GTDT")

       == Generic Timer Description Table ==



       **Generic Timer Description Table**



       Required for arm64.



HEST   Section 18.3.2 (signature == "HEST")

       == Hardware Error Source Table ==



       **Hardware Error Source Table**



       ARM-specific error sources have been defined; please use those or the

       PCI types such as type 6 (AER Root Port), 7 (AER Endpoint), or 8 (AER

       Bridge), or use type 9 (Generic Hardware Error Source).  Firmware first
@@ -144,15 +185,21 @@ HEST Section 18.3.2 (signature == "HEST") 
       is recommended this table be supplied.



HPET   Signature Reserved (signature == "HPET")

       == High Precision Event timer Table ==



       **High Precision Event timer Table**



       x86 only table, will not be supported.



IBFT   Signature Reserved (signature == "IBFT")

       == iSCSI Boot Firmware Table ==



       **iSCSI Boot Firmware Table**



       Microsoft defined table, support TBD.



IORT   Signature Reserved (signature == "IORT")

       == Input Output Remapping Table ==



       **Input Output Remapping Table**



       arm64 only table, required in order to describe IO topology, SMMUs,

       and GIC ITSs, and how those various components are connected together,

       such as identifying which components are behind which SMMUs/ITSs.
@@ -161,105 +208,151 @@ IORT Signature Reserved (signature == "IORT") 
       remains optional.



IVRS   Signature Reserved (signature == "IVRS")

       == I/O Virtualization Reporting Structure ==



       **I/O Virtualization Reporting Structure**



       x86_64 (AMD) only table, will not be supported.



LPIT   Signature Reserved (signature == "LPIT")

       == Low Power Idle Table ==



       **Low Power Idle Table**



       x86 only table as of ACPI 5.1; starting with ACPI 6.0, processor

       descriptions and power states on ARM platforms should use the DSDT

       and define processor container devices (_HID ACPI0010, Section 8.4,

       and more specifically 8.4.3 and and 8.4.4).



MADT   Section 5.2.12 (signature == "APIC")

       == Multiple APIC Description Table ==



       **Multiple APIC Description Table**



       Required for arm64.  Only the GIC interrupt controller structures

       should be used (types 0xA - 0xF).



MCFG   Signature Reserved (signature == "MCFG")

       == Memory-mapped ConFiGuration space ==



       **Memory-mapped ConFiGuration space**



       If the platform supports PCI/PCIe, an MCFG table is required.



MCHI   Signature Reserved (signature == "MCHI")

       == Management Controller Host Interface table ==



       **Management Controller Host Interface table**



       Optional, not currently supported.



MPST   Section 5.2.21 (signature == "MPST")

       == Memory Power State Table ==



       **Memory Power State Table**



       Optional, not currently supported.



MSCT   Section 5.2.19 (signature == "MSCT")

       == Maximum System Characteristic Table ==



       **Maximum System Characteristic Table**



       Optional, not currently supported.



MSDM   Signature Reserved (signature == "MSDM")

       == Microsoft Data Management table ==



       **Microsoft Data Management table**



       Microsoft only table, will not be supported.



NFIT   Section 5.2.25 (signature == "NFIT")

       == NVDIMM Firmware Interface Table ==



       **NVDIMM Firmware Interface Table**



       Optional, not currently supported.



OEMx   Signature of "OEMx" only

       == OEM Specific Tables ==



       **OEM Specific Tables**



       All tables starting with a signature of "OEM" are reserved for OEM

       use.  Since these are not meant to be of general use but are limited

       to very specific end users, they are not recommended for use and are

       not supported by the kernel for arm64.



PCCT   Section 14.1 (signature == "PCCT)

       == Platform Communications Channel Table ==



       **Platform Communications Channel Table**



       Recommend for use on arm64; use of PCC is recommended when using CPPC

       to control performance and power for platform processors.



PMTT   Section 5.2.21.12 (signature == "PMTT")

       == Platform Memory Topology Table ==



       **Platform Memory Topology Table**



       Optional, not currently supported.



PSDT   Section 5.2.11.3 (signature == "PSDT")

       == Persistent System Description Table ==



       **Persistent System Description Table**



       Obsolete table, will not be supported.



RASF   Section 5.2.20 (signature == "RASF")

       == RAS Feature table ==



       **RAS Feature table**



       Optional, not currently supported.



RSDP   Section 5.2.5 (signature == "RSD PTR")

       == Root System Description PoinTeR ==



       **Root System Description PoinTeR**



       Required for arm64.



RSDT   Section 5.2.7 (signature == "RSDT")

       == Root System Description Table ==



       **Root System Description Table**



       Since this table can only provide 32-bit addresses, it is deprecated

       on arm64, and will not be used.  If provided, it will be ignored.



SBST   Section 5.2.14 (signature == "SBST")

       == Smart Battery Subsystem Table ==



       **Smart Battery Subsystem Table**



       Optional, not currently supported.



SLIC   Signature Reserved (signature == "SLIC")

       == Software LIcensing table ==



       **Software LIcensing table**



       Microsoft only table, will not be supported.



SLIT   Section 5.2.17 (signature == "SLIT")

       == System Locality distance Information Table ==



       **System Locality distance Information Table**



       Optional in general, but required for NUMA systems.



SPCR   Signature Reserved (signature == "SPCR")

       == Serial Port Console Redirection table ==



       **Serial Port Console Redirection table**



       Required for arm64.



SPMI   Signature Reserved (signature == "SPMI")

       == Server Platform Management Interface table ==



       **Server Platform Management Interface table**



       Optional, not currently supported.



SRAT   Section 5.2.16 (signature == "SRAT")

       == System Resource Affinity Table ==



       **System Resource Affinity Table**



       Optional, but if used, only the GICC Affinity structures are read.

       To support arm64 NUMA, this table is required.



SSDT   Section 5.2.11.2 (signature == "SSDT")

       == Secondary System Description Table ==



       **Secondary System Description Table**



       These tables are a continuation of the DSDT; these are recommended

       for use with devices that can be added to a running system, but can

       also serve the purpose of dividing up device descriptions into more
@@ -272,49 +365,69 @@ SSDT Section 5.2.11.2 (signature == "SSDT") 
       one DSDT but can contain many SSDTs.



STAO   Signature Reserved (signature == "STAO")

       == _STA Override table ==



       **_STA Override table**



       Optional, but only necessary in virtualized environments in order to

       hide devices from guest OSs.



TCPA   Signature Reserved (signature == "TCPA")

       == Trusted Computing Platform Alliance table ==



       **Trusted Computing Platform Alliance table**



       Optional, not currently supported, and may need changes to fully

       interoperate with arm64.



TPM2   Signature Reserved (signature == "TPM2")

       == Trusted Platform Module 2 table ==



       **Trusted Platform Module 2 table**



       Optional, not currently supported, and may need changes to fully

       interoperate with arm64.



UEFI   Signature Reserved (signature == "UEFI")

       == UEFI ACPI data table ==



       **UEFI ACPI data table**



       Optional, not currently supported.  No known use case for arm64,

       at present.



WAET   Signature Reserved (signature == "WAET")

       == Windows ACPI Emulated devices Table ==



       **Windows ACPI Emulated devices Table**



       Microsoft only table, will not be supported.



WDAT   Signature Reserved (signature == "WDAT")

       == Watch Dog Action Table ==



       **Watch Dog Action Table**



       Microsoft only table, will not be supported.



WDRT   Signature Reserved (signature == "WDRT")

       == Watch Dog Resource Table ==



       **Watch Dog Resource Table**



       Microsoft only table, will not be supported.



WPBT   Signature Reserved (signature == "WPBT")

       == Windows Platform Binary Table ==



       **Windows Platform Binary Table**



       Microsoft only table, will not be supported.



XENV   Signature Reserved (signature == "XENV")

       == Xen project table ==



       **Xen project table**



       Optional, used only by Xen at present.



XSDT   Section 5.2.8 (signature == "XSDT")

       == eXtended System Description Table ==

       Required for arm64.



       **eXtended System Description Table**



       Required for arm64.

====== ========================================================================



ACPI Objects

------------
@@ -323,10 +436,11 @@ shown in the list that follows; any object not explicitly mentioned below 
should be used as needed for a particular platform or particular subsystem,

such as power management or PCI.



===== ================ ========================================================

Name   Section         Usage for ARMv8 Linux

----   ------------    -------------------------------------------------

===== ================ ========================================================

_CCA   6.2.17          This method must be defined for all bus masters

                       on arm64 -- there are no assumptions made about

                       on arm64 - there are no assumptions made about

                       whether such devices are cache coherent or not.

                       The _CCA value is inherited by all descendants of

                       these devices so it does not need to be repeated.
@@ -476,6 +590,7 @@ _SWS 7.4.3 Use as needed; power management specific; this may 


_UID   6.1.12          Recommended for distinguishing devices of the same

                       class; define it if at all possible.

===== ================ ========================================================
@@ -488,7 +603,7 @@ platforms, ACPI events must be signaled differently. 


There are two options: GPIO-signaled interrupts (Section 5.6.5), and

interrupt-signaled events (Section 5.6.9).  Interrupt-signaled events are a

new feature in the ACPI 6.1 specification.  Either -- or both -- can be used

new feature in the ACPI 6.1 specification.  Either - or both - can be used

on a given platform, and which to use may be dependent of limitations in any

given SoC.  If possible, interrupt-signaled events are recommended.
@@ -564,39 +679,40 @@ supported. 


The following classes of objects are not supported:



       -- Section 9.2: ambient light sensor devices

       -  Section 9.2: ambient light sensor devices



       -- Section 9.3: battery devices

       -  Section 9.3: battery devices



       -- Section 9.4: lids (e.g., laptop lids)

       -  Section 9.4: lids (e.g., laptop lids)



       -- Section 9.8.2: IDE controllers

       -  Section 9.8.2: IDE controllers



       -- Section 9.9: floppy controllers

       -  Section 9.9: floppy controllers



       -- Section 9.10: GPE block devices

       -  Section 9.10: GPE block devices



       -- Section 9.15: PC/AT RTC/CMOS devices

       -  Section 9.15: PC/AT RTC/CMOS devices



       -- Section 9.16: user presence detection devices

       -  Section 9.16: user presence detection devices



       -- Section 9.17: I/O APIC devices; all GICs must be enumerable via MADT

       -  Section 9.17: I/O APIC devices; all GICs must be enumerable via MADT



       -- Section 9.18: time and alarm devices (see 9.15)

       -  Section 9.18: time and alarm devices (see 9.15)



       -- Section 10: power source and power meter devices

       -  Section 10: power source and power meter devices



       -- Section 11: thermal management

       -  Section 11: thermal management



       -- Section 12: embedded controllers interface

       -  Section 12: embedded controllers interface



       -- Section 13: SMBus interfaces

       -  Section 13: SMBus interfaces





This also means that there is no support for the following objects:



====   =========================== ====   ==========

Name   Section                     Name   Section

----   ------------                ----   ------------

====   =========================== ====   ==========

_ALC   9.3.4                       _FDM   9.10.3

_ALI   9.3.2                       _FIX   6.2.7

_ALP   9.3.6                       _GAI   10.4.5
@@ -619,4 +735,4 @@ _DCK 6.5.2 _UPD 9.16.1 
_EC    12.12                       _UPP   9.16.2

_FDE   9.10.1                      _WPC   10.5.2

_FDI   9.10.2                      _WPP   10.5.3

====   =========================== ====   ==========

Documentation/arm64/arm-acpi.txt→Documentation/arm64/arm-acpi.rst

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Documentation/arm64/booting.txt→Documentation/arm64/booting.rst

+59 −32
Original line number Diff line number Diff line 
=====================

Booting AArch64 Linux

=====================



Author: Will Deacon <will.deacon@arm.com>



Date  : 07 September 2012



This document is based on the ARM booting document by Russell King and
@@ -12,7 +14,7 @@ The AArch64 exception model is made up of a number of exception levels 
counterpart.  EL2 is the hypervisor level and exists only in non-secure

mode. EL3 is the highest priority level and exists only in secure mode.



For the purposes of this document, we will use the term `boot loader'

For the purposes of this document, we will use the term `boot loader`

simply to define all software that executes on the CPU(s) before control

is passed to the Linux kernel.  This may include secure monitor and

hypervisor code, or it may just be a handful of instructions for
@@ -70,7 +72,7 @@ Image target is available instead. 


Requirement: MANDATORY



The decompressed kernel image contains a 64-byte header as follows:

The decompressed kernel image contains a 64-byte header as follows::



  u32 code0;			/* Executable code */

  u32 code1;			/* Executable code */
@@ -103,19 +105,26 @@ Header notes: 


- The flags field (introduced in v3.17) is a little-endian 64-bit field

  composed as follows:

  Bit 0:	Kernel endianness.  1 if BE, 0 if LE.

  Bit 1-2:	Kernel Page size.

			0 - Unspecified.

			1 - 4K

			2 - 16K

			3 - 64K

  Bit 3:	Kernel physical placement

			0 - 2MB aligned base should be as close as possible



  ============= ===============================================================

  Bit 0		Kernel endianness.  1 if BE, 0 if LE.

  Bit 1-2	Kernel Page size.



			* 0 - Unspecified.

			* 1 - 4K

			* 2 - 16K

			* 3 - 64K

  Bit 3		Kernel physical placement



			0

			  2MB aligned base should be as close as possible

			  to the base of DRAM, since memory below it is not

			  accessible via the linear mapping

			1 - 2MB aligned base may be anywhere in physical

			1

			  2MB aligned base may be anywhere in physical

			  memory

  Bits 4-63:	Reserved.

  Bits 4-63	Reserved.

  ============= ===============================================================



- When image_size is zero, a bootloader should attempt to keep as much

  memory as possible free for use by the kernel immediately after the
@@ -147,19 +156,22 @@ Before jumping into the kernel, the following conditions must be met: 
  corrupted by bogus network packets or disk data.  This will save

  you many hours of debug.



- Primary CPU general-purpose register settings

  x0 = physical address of device tree blob (dtb) in system RAM.

  x1 = 0 (reserved for future use)

  x2 = 0 (reserved for future use)

  x3 = 0 (reserved for future use)

- Primary CPU general-purpose register settings:



    - x0 = physical address of device tree blob (dtb) in system RAM.

    - x1 = 0 (reserved for future use)

    - x2 = 0 (reserved for future use)

    - x3 = 0 (reserved for future use)



- CPU mode



  All forms of interrupts must be masked in PSTATE.DAIF (Debug, SError,

  IRQ and FIQ).

  The CPU must be in either EL2 (RECOMMENDED in order to have access to

  the virtualisation extensions) or non-secure EL1.



- Caches, MMUs



  The MMU must be off.

  Instruction cache may be on or off.

  The address range corresponding to the loaded kernel image must be
@@ -172,18 +184,21 @@ Before jumping into the kernel, the following conditions must be met: 
  operations (not recommended) must be configured and disabled.



- Architected timers



  CNTFRQ must be programmed with the timer frequency and CNTVOFF must

  be programmed with a consistent value on all CPUs.  If entering the

  kernel at EL1, CNTHCTL_EL2 must have EL1PCTEN (bit 0) set where

  available.



- Coherency



  All CPUs to be booted by the kernel must be part of the same coherency

  domain on entry to the kernel.  This may require IMPLEMENTATION DEFINED

  initialisation to enable the receiving of maintenance operations on

  each CPU.



- System registers



  All writable architected system registers at the exception level where

  the kernel image will be entered must be initialised by software at a

  higher exception level to prevent execution in an UNKNOWN state.
@@ -195,28 +210,40 @@ Before jumping into the kernel, the following conditions must be met: 


  For systems with a GICv3 interrupt controller to be used in v3 mode:

  - If EL3 is present:

    ICC_SRE_EL3.Enable (bit 3) must be initialiased to 0b1.

    ICC_SRE_EL3.SRE (bit 0) must be initialised to 0b1.



      - ICC_SRE_EL3.Enable (bit 3) must be initialiased to 0b1.

      - ICC_SRE_EL3.SRE (bit 0) must be initialised to 0b1.



  - If the kernel is entered at EL1:

    ICC.SRE_EL2.Enable (bit 3) must be initialised to 0b1

    ICC_SRE_EL2.SRE (bit 0) must be initialised to 0b1.



      - ICC.SRE_EL2.Enable (bit 3) must be initialised to 0b1

      - ICC_SRE_EL2.SRE (bit 0) must be initialised to 0b1.



  - The DT or ACPI tables must describe a GICv3 interrupt controller.



  For systems with a GICv3 interrupt controller to be used in

  compatibility (v2) mode:



  - If EL3 is present:



      ICC_SRE_EL3.SRE (bit 0) must be initialised to 0b0.



  - If the kernel is entered at EL1:



      ICC_SRE_EL2.SRE (bit 0) must be initialised to 0b0.



  - The DT or ACPI tables must describe a GICv2 interrupt controller.



  For CPUs with pointer authentication functionality:

  - If EL3 is present:

    SCR_EL3.APK (bit 16) must be initialised to 0b1

    SCR_EL3.API (bit 17) must be initialised to 0b1



    - SCR_EL3.APK (bit 16) must be initialised to 0b1

    - SCR_EL3.API (bit 17) must be initialised to 0b1



  - If the kernel is entered at EL1:

    HCR_EL2.APK (bit 40) must be initialised to 0b1

    HCR_EL2.API (bit 41) must be initialised to 0b1



    - HCR_EL2.APK (bit 40) must be initialised to 0b1

    - HCR_EL2.API (bit 41) must be initialised to 0b1



The requirements described above for CPU mode, caches, MMUs, architected

timers, coherency and system registers apply to all CPUs.  All CPUs must

Documentation/arm64/elf_hwcaps.txt→Documentation/arm64/elf_hwcaps.rst

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