Documentation: x86: convert zero-page.txt to reST

This converts the plain text documentation to reStructuredText format and
add it to Sphinx TOC tree. No essential content change.

Signed-off-by: Changbin Du <changbin.du@gmail.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

3 files changed, 46 insertions, 40 deletions

diff --git a/Documentation/x86/index.rst b/Documentation/x86/index.rst
index d9ccc0f39279..e43aa9b31976 100644
--- a/Documentation/x86/index.rst
+++ b/Documentation/x86/index.rst
@@ -14,3 +14,4 @@ x86-specific Documentation
    kernel-stacks
    entry_64
    earlyprintk
+   zero-page
diff --git a/Documentation/x86/zero-page.rst b/Documentation/x86/zero-page.rst
new file mode 100644
index 000000000000..f088f5881666
--- /dev/null
+++ b/Documentation/x86/zero-page.rst
@@ -0,0 +1,45 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+=========
+Zero Page
+=========
+The additional fields in struct boot_params as a part of 32-bit boot
+protocol of kernel. These should be filled by bootloader or 16-bit
+real-mode setup code of the kernel. References/settings to it mainly
+are in::
+
+  arch/x86/include/uapi/asm/bootparam.h
+
+===========     =====   ======================= =================================================
+Offset/Size     Proto   Name                    Meaning
+
+000/040         ALL     screen_info             Text mode or frame buffer information
+                                                (struct screen_info)
+040/014         ALL     apm_bios_info           APM BIOS information (struct apm_bios_info)
+058/008         ALL     tboot_addr              Physical address of tboot shared page
+060/010         ALL     ist_info                Intel SpeedStep (IST) BIOS support information
+                                                (struct ist_info)
+080/010         ALL     hd0_info                hd0 disk parameter, OBSOLETE!!
+090/010         ALL     hd1_info                hd1 disk parameter, OBSOLETE!!
+0A0/010         ALL     sys_desc_table          System description table (struct sys_desc_table),
+                                                OBSOLETE!!
+0B0/010         ALL     olpc_ofw_header         OLPC's OpenFirmware CIF and friends
+0C0/004         ALL     ext_ramdisk_image       ramdisk_image high 32bits
+0C4/004         ALL     ext_ramdisk_size        ramdisk_size high 32bits
+0C8/004         ALL     ext_cmd_line_ptr        cmd_line_ptr high 32bits
+140/080         ALL     edid_info               Video mode setup (struct edid_info)
+1C0/020         ALL     efi_info                EFI 32 information (struct efi_info)
+1E0/004         ALL     alt_mem_k               Alternative mem check, in KB
+1E4/004         ALL     scratch                 Scratch field for the kernel setup code
+1E8/001         ALL     e820_entries            Number of entries in e820_table (below)
+1E9/001         ALL     eddbuf_entries          Number of entries in eddbuf (below)
+1EA/001         ALL     edd_mbr_sig_buf_entries Number of entries in edd_mbr_sig_buffer
+                                                (below)
+1EB/001         ALL     kbd_status              Numlock is enabled
+1EC/001         ALL     secure_boot             Secure boot is enabled in the firmware
+1EF/001         ALL     sentinel                Used to detect broken bootloaders
+290/040         ALL     edd_mbr_sig_buffer      EDD MBR signatures
+2D0/A00         ALL     e820_table              E820 memory map table
+                                                (array of struct e820_entry)
+D00/1EC         ALL     eddbuf                  EDD data (array of struct edd_info)
+===========     =====   ======================= =================================================
diff --git a/Documentation/x86/zero-page.txt b/Documentation/x86/zero-page.txt
deleted file mode 100644
index 68aed077f7b6..000000000000
--- a/Documentation/x86/zero-page.txt
+++ /dev/null
@@ -1,40 +0,0 @@
-The additional fields in struct boot_params as a part of 32-bit boot
-protocol of kernel. These should be filled by bootloader or 16-bit
-real-mode setup code of the kernel. References/settings to it mainly
-are in:
-
-  arch/x86/include/uapi/asm/bootparam.h
-
-
-Offset  Proto   Name            Meaning
-/Size
-
-000/040 ALL     screen_info     Text mode or frame buffer information
-                                (struct screen_info)
-040/014 ALL     apm_bios_info   APM BIOS information (struct apm_bios_info)
-058/008 ALL     tboot_addr      Physical address of tboot shared page
-060/010 ALL     ist_info        Intel SpeedStep (IST) BIOS support information
-                                (struct ist_info)
-080/010 ALL     hd0_info        hd0 disk parameter, OBSOLETE!!
-090/010 ALL     hd1_info        hd1 disk parameter, OBSOLETE!!
-0A0/010 ALL     sys_desc_table  System description table (struct sys_desc_table),
-                                OBSOLETE!!
-0B0/010 ALL     olpc_ofw_header OLPC's OpenFirmware CIF and friends
-0C0/004 ALL     ext_ramdisk_image ramdisk_image high 32bits
-0C4/004 ALL     ext_ramdisk_size  ramdisk_size high 32bits
-0C8/004 ALL     ext_cmd_line_ptr  cmd_line_ptr high 32bits
-140/080 ALL     edid_info       Video mode setup (struct edid_info)
-1C0/020 ALL     efi_info        EFI 32 information (struct efi_info)
-1E0/004 ALL     alt_mem_k       Alternative mem check, in KB
-1E4/004 ALL     scratch         Scratch field for the kernel setup code
-1E8/001 ALL     e820_entries    Number of entries in e820_table (below)
-1E9/001 ALL     eddbuf_entries  Number of entries in eddbuf (below)
-1EA/001 ALL     edd_mbr_sig_buf_entries Number of entries in edd_mbr_sig_buffer
-                                (below)
-1EB/001 ALL     kbd_status      Numlock is enabled
-1EC/001 ALL     secure_boot     Secure boot is enabled in the firmware
-1EF/001 ALL     sentinel        Used to detect broken bootloaders
-290/040 ALL     edd_mbr_sig_buffer EDD MBR signatures
-2D0/A00 ALL     e820_table      E820 memory map table
-                                (array of struct e820_entry)
-D00/1EC ALL     eddbuf          EDD data (array of struct edd_info)