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authorStewart Smith <stewart@linux.vnet.ibm.com>2016-07-27 17:43:05 +1000
committerStewart Smith <stewart@linux.vnet.ibm.com>2016-08-02 17:31:12 +1000
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treee2a0a86502224ae9acb462b7b98e0a772a1a30e3 /doc/opal-spec.rst
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doc/*.rst: fix ReSTructured text syntax
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Diffstat (limited to 'doc/opal-spec.rst')
-rw-r--r--doc/opal-spec.rst99
1 files changed, 57 insertions, 42 deletions
diff --git a/doc/opal-spec.rst b/doc/opal-spec.rst
index ea76e59..eca8472 100644
--- a/doc/opal-spec.rst
+++ b/doc/opal-spec.rst
@@ -1,9 +1,9 @@
OPAL Specification
==================
-DRAFT - VERSION 0.0.1 AT BEST.
+**DRAFT - VERSION 0.0.1 AT BEST.**
-COMMENTS ARE WELCOME - and indeed, needed.
+**COMMENTS ARE WELCOME** - and indeed, needed.
If you are reading this, congratulations: you're now reviewing it!
@@ -34,21 +34,27 @@ POWER systems. There are several components to what makes up a firmware
image for OpenPower machines.
For example, there may be:
-- BMC firmware
- - Firmware that runs purely on the BMC.
- - On IBM systems that have an FSP rather than a BMC, there is FSP firmware
- - While essential to having the machine function, this firmware is not
+
+* BMC firmware
+
+ * Firmware that runs purely on the BMC.
+ * On IBM systems that have an FSP rather than a BMC, there is FSP firmware
+ * While essential to having the machine function, this firmware is not
part of the OPAL Specification.
-- HostBoot
- - HostBoot ( https://github.com/open-power/hostboot ) performs all
+* HostBoot
+
+ * HostBoot ( https://github.com/open-power/hostboot ) performs all
processor, bus and memory initialization within IBM POWER based systems.
-- OCC Firmware
- - On Chip Controller ( Firmware for OCC - a PPC405 core inside the IBM
+* OCC Firmware
+
+ * On Chip Controller ( Firmware for OCC - a PPC405 core inside the IBM
POWER8 in charge of keeping the system thermally and power safe ).
-- SkiBoot
- - Boot and runtime services.
-- A linux kernel and initramfs incorporating petitboot
- - The bootloader. This is where a user chooses what OS to boot, and
+* SkiBoot
+
+ * Boot and runtime services.
+* A linux kernel and initramfs incorporating petitboot
+
+ * The bootloader. This is where a user chooses what OS to boot, and
petitboot will use kexec to switch to the host Operating System
(for example, PowerKVM).
@@ -66,15 +72,17 @@ Operating System. It does not dictate that any specific pieces of firmware
code be used, although re-inventing the wheel is strongly discouraged.
The OPAL Specification explicitly allows for:
-- A conforming implementation to not use any of the reference implementation
+
+* A conforming implementation to not use any of the reference implementation
code.
-- A conforming implementation to use any 64bit POWER ISA conforming processor,
+* A conforming implementation to use any 64bit POWER ISA conforming processor,
and not be limited to the IBM POWER8.
-- A conforming implementation to be a simulator, emulator or virtual environment
-- A host OS other than Linux
+* A conforming implementation to be a simulator, emulator or virtual environment
+* A host OS other than Linux
Explicitly not covered in this specification:
-- A 32bit OPAL Specification
+
+* A 32bit OPAL Specification
There is no reason this couldn't exist but the current specification is for
64bit POWER systems only.
@@ -93,32 +101,38 @@ The OPAL Specification explicitly allows variation in this payload.
A requirement of the payload is that it MUST support loading and booting
an uncomppressed vmlinux Linux kernel.
-[TODO: expand on what this actually means]
+[**TODO**: expand on what this actually means]
An OPAL system MUST pass a device tree to the host kernel.
-[TODO: expand the details, add device-tree section and spec]
+[**TODO**: expand the details, add device-tree section and spec]
An OPAL system MUST provide the host kernel with enough information to
know how to call OPAL runtime services.
-[TODO: expand on this. ]
+[**TODO**: expand on this. ]
Explicitly not covered by the OPAL Specification:
-- Kernel module ABI for skiroot kernel
-- Userspace environment of skiroot
-- That skiroot is Linux.
+
+* Kernel module ABI for skiroot kernel
+* Userspace environment of skiroot
+* That skiroot is Linux.
Explicitly allowed:
-- Replacing the payload with something of equal/similar functionality
+
+* Replacing the payload with something of equal/similar functionality
(weather replacing skiroot with an implementation of Zork would be compliant
- is left as an exercise for the reader)
+ is left as an exercise for the reader)
Payload Environment
-------------------
The payload is started with:
-r3 = address of flattened device-tree (fdt)
-r8 = OPAL base
-r9 = OPAL entry
+======== =====
+Register Value
+======== =====
+r3 address of flattened device-tree (fdt)
+r8 OPAL base
+r9 OPAL entry
+======== =====
Runtime Services
----------------
@@ -143,12 +157,13 @@ All parameters to OPAL calls are big endian. Little endian hosts MUST
appropriately convert parameters before passing them to OPAL.
Machine state across OPAL calls:
-- r1 is preserved
-- r12 is scratch
-- r13 - 31 preserved
-- 64bit HV real mode
-- big endian
-- external interrupts disabled
+
+* r1 is preserved
+* r12 is scratch
+* r13 - 31 preserved
+* 64bit HV real mode
+* big endian
+* external interrupts disabled
Detecting OPAL Support
----------------------
@@ -165,14 +180,14 @@ The presence of the "/ibm,opal" entry in the device tree signifies running
under OPAL. Additionally, the "/ibm,opal" node MUST have a compatibile property
listing "ibm,opal-v3".
-The "/ibm,opal" node MUST have the following properties:
+The "/ibm,opal" node MUST have the following properties: ::
-ibm,opal {
+ ibm,opal {
compatible = "ibm,opal-v3";
opal-base-address = <>;
opal-entry-address = <>;
opal-runtime-size = <>;
-}
+ }
The compatible property MAY have other strings, such as a future "ibm,opal-v4".
These are reserved for future use.
@@ -182,11 +197,11 @@ contain "ibm,opal-v2" as well as "ibm,opal-v3". Host operating systems MUST
NOT rely on "ibm,opal-v2", this is a relic from early OPAL history.
The "ibm,opal" node MUST have a child node named "firmware". It MUST contain
-the following:
+the following: ::
-firmware {
+ firmware {
compatible = "ibm,opal-firmware";
-}
+ }
It MUST contain one of the following two properties: git-id, version.
The git-id property is deprecated, and version SHOULD be used. These