Re: [PATCH v2 5/7] docs: move generic-loader documentation into the main manual

[Alistair Francis <alistair23@gmail.com>]

On Thu, Feb 11, 2021 at 9:21 AM Alex Bennée <alex.bennee@linaro.org> wrote:
>
> We might as well surface this useful information in the manual so
> users can find it easily. It is a fairly simple conversion to rst with
> the only textual fixes being QemuOps to QemuOpts.
>
> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
> Message-Id: <20201105175153.30489-6-alex.bennee@linaro.org>

Reviewed-by: Alistair Francis <alistair.francis@wdc.com>

Alistair

>
> ---
> v2
>   - fix whitespace
>   - update MAINTAINERS
> ---
>  docs/generic-loader.txt        |  92 --------------------------
>  docs/system/generic-loader.rst | 117 +++++++++++++++++++++++++++++++++
>  docs/system/index.rst          |   1 +
>  MAINTAINERS                    |   2 +-
>  4 files changed, 119 insertions(+), 93 deletions(-)
>  delete mode 100644 docs/generic-loader.txt
>  create mode 100644 docs/system/generic-loader.rst
>
> diff --git a/docs/generic-loader.txt b/docs/generic-loader.txt
> deleted file mode 100644
> index a9603a2af7..0000000000
> --- a/docs/generic-loader.txt
> +++ /dev/null
> @@ -1,92 +0,0 @@
> -Copyright (c) 2016 Xilinx Inc.
> -
> -This work is licensed under the terms of the GNU GPL, version 2 or later.  See
> -the COPYING file in the top-level directory.
> -
> -
> -The 'loader' device allows the user to load multiple images or values into
> -QEMU at startup.
> -
> -Loading Data into Memory Values
> --------------------------------
> -The loader device allows memory values to be set from the command line. This
> -can be done by following the syntax below:
> -
> -     -device loader,addr=<addr>,data=<data>,data-len=<data-len>
> -                   [,data-be=<data-be>][,cpu-num=<cpu-num>]
> -
> -    <addr>      - The address to store the data in.
> -    <data>      - The value to be written to the address. The maximum size of
> -                  the data is 8 bytes.
> -    <data-len>  - The length of the data in bytes. This argument must be
> -                  included if the data argument is.
> -    <data-be>   - Set to true if the data to be stored on the guest should be
> -                  written as big endian data. The default is to write little
> -                  endian data.
> -    <cpu-num>   - The number of the CPU's address space where the data should
> -                  be loaded. If not specified the address space of the first
> -                  CPU is used.
> -
> -All values are parsed using the standard QemuOps parsing. This allows the user
> -to specify any values in any format supported. By default the values
> -will be parsed as decimal. To use hex values the user should prefix the number
> -with a '0x'.
> -
> -An example of loading value 0x8000000e to address 0xfd1a0104 is:
> -    -device loader,addr=0xfd1a0104,data=0x8000000e,data-len=4
> -
> -Setting a CPU's Program Counter
> --------------------------------
> -The loader device allows the CPU's PC to be set from the command line. This
> -can be done by following the syntax below:
> -
> -     -device loader,addr=<addr>,cpu-num=<cpu-num>
> -
> -    <addr>      - The value to use as the CPU's PC.
> -    <cpu-num>   - The number of the CPU whose PC should be set to the
> -                  specified value.
> -
> -All values are parsed using the standard QemuOps parsing. This allows the user
> -to specify any values in any format supported. By default the values
> -will be parsed as decimal. To use hex values the user should prefix the number
> -with a '0x'.
> -
> -An example of setting CPU 0's PC to 0x8000 is:
> -    -device loader,addr=0x8000,cpu-num=0
> -
> -Loading Files
> --------------
> -The loader device also allows files to be loaded into memory. It can load ELF,
> -U-Boot, and Intel HEX executable formats as well as raw images.  The syntax is
> -shown below:
> -
> -    -device loader,file=<file>[,addr=<addr>][,cpu-num=<cpu-num>][,force-raw=<raw>]
> -
> -    <file>      - A file to be loaded into memory
> -    <addr>      - The memory address where the file should be loaded. This is
> -                  required for raw images and ignored for non-raw files.
> -    <cpu-num>   - This specifies the CPU that should be used. This is an
> -                  optional argument and will cause the CPU's PC to be set to
> -                  the memory address where the raw file is loaded or the entry
> -                  point specified in the executable format header. This option
> -                  should only be used for the boot image.
> -                  This will also cause the image to be written to the specified
> -                  CPU's address space. If not specified, the default is CPU 0.
> -    <force-raw> - Setting force-raw=on forces the file to be treated as a raw
> -                  image.  This can be used to load supported executable formats
> -                  as if they were raw.
> -
> -All values are parsed using the standard QemuOps parsing. This allows the user
> -to specify any values in any format supported. By default the values
> -will be parsed as decimal. To use hex values the user should prefix the number
> -with a '0x'.
> -
> -An example of loading an ELF file which CPU0 will boot is shown below:
> -    -device loader,file=./images/boot.elf,cpu-num=0
> -
> -Restrictions and ToDos
> -----------------------
> - - At the moment it is just assumed that if you specify a cpu-num then you
> -   want to set the PC as well. This might not always be the case. In future
> -   the internal state 'set_pc' (which exists in the generic loader now) should
> -   be exposed to the user so that they can choose if the PC is set or not.
> diff --git a/docs/system/generic-loader.rst b/docs/system/generic-loader.rst
> new file mode 100644
> index 0000000000..6bf8a4eb48
> --- /dev/null
> +++ b/docs/system/generic-loader.rst
> @@ -0,0 +1,117 @@
> +..
> +   Copyright (c) 2016, Xilinx Inc.
> +
> +This work is licensed under the terms of the GNU GPL, version 2 or later.  See
> +the COPYING file in the top-level directory.
> +
> +Generic Loader
> +--------------
> +
> +The 'loader' device allows the user to load multiple images or values into
> +QEMU at startup.
> +
> +Loading Data into Memory Values
> +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> +The loader device allows memory values to be set from the command line. This
> +can be done by following the syntax below::
> +
> +   -device loader,addr=<addr>,data=<data>,data-len=<data-len> \
> +                   [,data-be=<data-be>][,cpu-num=<cpu-num>]
> +
> +``<addr>``
> +  The address to store the data in.
> +
> +``<data>``
> +  The value to be written to the address. The maximum size of the data
> +  is 8 bytes.
> +
> +``<data-len>``
> +  The length of the data in bytes. This argument must be included if
> +  the data argument is.
> +
> +``<data-be>``
> +  Set to true if the data to be stored on the guest should be written
> +  as big endian data. The default is to write little endian data.
> +
> +``<cpu-num>``
> +  The number of the CPU's address space where the data should be
> +  loaded. If not specified the address space of the first CPU is used.
> +
> +All values are parsed using the standard QemuOps parsing. This allows the user
> +to specify any values in any format supported. By default the values
> +will be parsed as decimal. To use hex values the user should prefix the number
> +with a '0x'.
> +
> +An example of loading value 0x8000000e to address 0xfd1a0104 is::
> +
> +    -device loader,addr=0xfd1a0104,data=0x8000000e,data-len=4
> +
> +Setting a CPU's Program Counter
> +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> +
> +The loader device allows the CPU's PC to be set from the command line. This
> +can be done by following the syntax below::
> +
> +     -device loader,addr=<addr>,cpu-num=<cpu-num>
> +
> +``<addr>``
> +  The value to use as the CPU's PC.
> +
> +``<cpu-num>``
> +  The number of the CPU whose PC should be set to the specified value.
> +
> +All values are parsed using the standard QemuOpts parsing. This allows the user
> +to specify any values in any format supported. By default the values
> +will be parsed as decimal. To use hex values the user should prefix the number
> +with a '0x'.
> +
> +An example of setting CPU 0's PC to 0x8000 is::
> +
> +    -device loader,addr=0x8000,cpu-num=0
> +
> +Loading Files
> +^^^^^^^^^^^^^
> +
> +The loader device also allows files to be loaded into memory. It can load ELF,
> +U-Boot, and Intel HEX executable formats as well as raw images.  The syntax is
> +shown below:
> +
> +    -device loader,file=<file>[,addr=<addr>][,cpu-num=<cpu-num>][,force-raw=<raw>]
> +
> +``<file>``
> +  A file to be loaded into memory
> +
> +``<addr>``
> +  The memory address where the file should be loaded. This is required
> +  for raw images and ignored for non-raw files.
> +
> +``<cpu-num>``
> +  This specifies the CPU that should be used. This is an
> +  optional argument and will cause the CPU's PC to be set to the
> +  memory address where the raw file is loaded or the entry point
> +  specified in the executable format header. This option should only
> +  be used for the boot image. This will also cause the image to be
> +  written to the specified CPU's address space. If not specified, the
> +  default is CPU 0. <force-raw> - Setting force-raw=on forces the file
> +  to be treated as a raw image. This can be used to load supported
> +  executable formats as if they were raw.
> +
> +All values are parsed using the standard QemuOpts parsing. This allows the user
> +to specify any values in any format supported. By default the values
> +will be parsed as decimal. To use hex values the user should prefix the number
> +with a '0x'.
> +
> +An example of loading an ELF file which CPU0 will boot is shown below::
> +
> +    -device loader,file=./images/boot.elf,cpu-num=0
> +
> +Restrictions and ToDos
> +^^^^^^^^^^^^^^^^^^^^^^
> +
> +At the moment it is just assumed that if you specify a cpu-num then
> +you want to set the PC as well. This might not always be the case. In
> +future the internal state 'set_pc' (which exists in the generic loader
> +now) should be exposed to the user so that they can choose if the PC
> +is set or not.
> +
> +
> diff --git a/docs/system/index.rst b/docs/system/index.rst
> index 625b494372..cee1c83540 100644
> --- a/docs/system/index.rst
> +++ b/docs/system/index.rst
> @@ -25,6 +25,7 @@ Contents:
>     usb
>     ivshmem
>     linuxboot
> +   generic-loader
>     vnc-security
>     tls
>     gdb
> diff --git a/MAINTAINERS b/MAINTAINERS
> index ab6877dae6..774b3ca7a5 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1991,7 +1991,7 @@ M: Alistair Francis <alistair@alistair23.me>
>  S: Maintained
>  F: hw/core/generic-loader.c
>  F: include/hw/core/generic-loader.h
> -F: docs/generic-loader.txt
> +F: docs/system/generic-loader.rst
>
>  Guest Loader
>  M: Alex Bennée <alex.bennee@linaro.org>
> --
> 2.20.1
>
>