aa69432a68
This patch documents the 32-bit boot protocol of x86. It has been used by Kexec and LinuxBIOS. This patch is based on the proposal of Peter Anvin. Signed-off-by: Huang Ying <ying.huang@intel.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
32 lines
1.3 KiB
Plaintext
32 lines
1.3 KiB
Plaintext
The additional fields in struct boot_params as a part of 32-bit boot
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protocol of kernel. These should be filled by bootloader or 16-bit
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real-mode setup code of the kernel. References/settings to it mainly
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are in:
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include/asm-x86/bootparam.h
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Offset Proto Name Meaning
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/Size
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000/040 ALL screen_info Text mode or frame buffer information
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(struct screen_info)
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040/014 ALL apm_bios_info APM BIOS information (struct apm_bios_info)
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060/010 ALL ist_info Intel SpeedStep (IST) BIOS support information
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(struct ist_info)
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080/010 ALL hd0_info hd0 disk parameter, OBSOLETE!!
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090/010 ALL hd1_info hd1 disk parameter, OBSOLETE!!
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0A0/010 ALL sys_desc_table System description table (struct sys_desc_table)
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140/080 ALL edid_info Video mode setup (struct edid_info)
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1C0/020 ALL efi_info EFI 32 information (struct efi_info)
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1E0/004 ALL alk_mem_k Alternative mem check, in KB
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1E4/004 ALL scratch Scratch field for the kernel setup code
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1E8/001 ALL e820_entries Number of entries in e820_map (below)
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1E9/001 ALL eddbuf_entries Number of entries in eddbuf (below)
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1EA/001 ALL edd_mbr_sig_buf_entries Number of entries in edd_mbr_sig_buffer
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(below)
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290/040 ALL edd_mbr_sig_buffer EDD MBR signatures
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2D0/A00 ALL e820_map E820 memory map table
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(array of struct e820entry)
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D00/1EC ALL eddbuf EDD data (array of struct edd_info)
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