Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / x86 / zero-page.txt

diff --git a/kernel/Documentation/x86/zero-page.txt b/kernel/Documentation/x86/zero-page.txt
new file mode 100644 (file)
index 0000000..82fbdbc
--- /dev/null
+++ b/kernel/Documentation/x86/zero-page.txt
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+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)
+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     alk_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_map (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)
+1EF/001        ALL     sentinel        Used to detect broken bootloaders
+290/040        ALL     edd_mbr_sig_buffer EDD MBR signatures
+2D0/A00        ALL     e820_map        E820 memory map table
+                               (array of struct e820entry)
+D00/1EC        ALL     eddbuf          EDD data (array of struct edd_info)