x86, boot: Define the 2.12 bzImage boot protocol
Define the 2.12 bzImage boot protocol: add xloadflags and additional fields to allow the command line, initramfs and struct boot_params to live above the 4 GiB mark. The xloadflags now communicates if this is a 64-bit kernel with the legacy 64-bit entry point and which of the EFI handover entry points are supported. Avoid adding new read flags to loadflags because of claimed bootloaders testing the whole byte for == 1 to determine bzImageness at least until the issue can be researched further. This is based on patches by Yinghai Lu and David Woodhouse. Originally-by: Yinghai Lu <yinghai@kernel.org> Originally-by: David Woodhouse <dwmw2@infradead.org> Acked-by: Yinghai Lu <yinghai@kernel.org> Acked-by: David Woodhouse <dwmw2@infradead.org> Acked-by: Matt Fleming <matt.fleming@intel.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> Link: http://lkml.kernel.org/r/1359058816-7615-26-git-send-email-yinghai@kernel.org Cc: Rob Landley <rob@landley.net> Cc: Gokul Caushik <caushik1@gmail.com> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Joe Millenbach <jmillenbach@gmail.com>
This commit is contained in:
H. Peter Anvin
parent
65315d4889
commit
09c205afde
5 changed files with 106 additions and 29 deletions
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@ -57,6 +57,10 @@ Protocol 2.10: (Kernel 2.6.31) Added a protocol for relaxed alignment
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Protocol 2.11: (Kernel 3.6) Added a field for offset of EFI handover
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protocol entry point.
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Protocol 2.12: (Kernel 3.9) Added the xloadflags field and extension fields
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to struct boot_params for for loading bzImage and ramdisk
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above 4G in 64bit.
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**** MEMORY LAYOUT
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The traditional memory map for the kernel loader, used for Image or
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@ -182,7 +186,7 @@ Offset Proto Name Meaning
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0230/4 2.05+ kernel_alignment Physical addr alignment required for kernel
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0234/1 2.05+ relocatable_kernel Whether kernel is relocatable or not
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0235/1 2.10+ min_alignment Minimum alignment, as a power of two
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0236/2 N/A pad3 Unused
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0236/2 2.12+ xloadflags Boot protocol option flags
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0238/4 2.06+ cmdline_size Maximum size of the kernel command line
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023C/4 2.07+ hardware_subarch Hardware subarchitecture
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0240/8 2.07+ hardware_subarch_data Subarchitecture-specific data
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@ -582,6 +586,27 @@ Protocol: 2.10+
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misaligned kernel. Therefore, a loader should typically try each
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power-of-two alignment from kernel_alignment down to this alignment.
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Field name: xloadflags
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Type: read
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Offset/size: 0x236/2
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Protocol: 2.12+
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This field is a bitmask.
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Bit 0 (read): XLF_KERNEL_64
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- If 1, this kernel has the legacy 64-bit entry point at 0x200.
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Bit 1 (read): XLF_CAN_BE_LOADED_ABOVE_4G
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- If 1, kernel/boot_params/cmdline/ramdisk can be above 4G.
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Bit 2 (read): XLF_EFI_HANDOVER_32
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- If 1, the kernel supports the 32-bit EFI handoff entry point
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given at handover_offset.
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Bit 3 (read): XLF_EFI_HANDOVER_64
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- If 1, the kernel supports the 64-bit EFI handoff entry point
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given at handover_offset + 0x200.
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Field name: cmdline_size
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Type: read
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Offset/size: 0x238/4
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@ -19,6 +19,9 @@ Offset Proto Name Meaning
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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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0B0/010 ALL olpc_ofw_header OLPC's OpenFirmware CIF and friends
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0C0/004 ALL ext_ramdisk_image ramdisk_image high 32bits
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0C4/004 ALL ext_ramdisk_size ramdisk_size high 32bits
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0C8/004 ALL ext_cmd_line_ptr cmd_line_ptr high 32bits
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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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@ -27,6 +30,7 @@ Offset Proto Name Meaning
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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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1EF/001 ALL sentinel Used to detect broken bootloaders
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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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@ -21,6 +21,7 @@
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#include <asm/e820.h>
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#include <asm/page_types.h>
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#include <asm/setup.h>
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#include <asm/bootparam.h>
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#include "boot.h"
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#include "voffset.h"
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#include "zoffset.h"
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@ -255,6 +256,9 @@ section_table:
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# header, from the old boot sector.
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.section ".header", "a"
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.globl sentinel
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sentinel: .byte 0xff, 0xff /* Used to detect broken loaders */
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.globl hdr
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hdr:
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setup_sects: .byte 0 /* Filled in by build.c */
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@ -279,7 +283,7 @@ _start:
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# Part 2 of the header, from the old setup.S
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.ascii "HdrS" # header signature
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.word 0x020b # header version number (>= 0x0105)
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.word 0x020c # header version number (>= 0x0105)
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# or else old loadlin-1.5 will fail)
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.globl realmode_swtch
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realmode_swtch: .word 0, 0 # default_switch, SETUPSEG
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@ -297,13 +301,7 @@ type_of_loader: .byte 0 # 0 means ancient bootloader, newer
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# flags, unused bits must be zero (RFU) bit within loadflags
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loadflags:
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LOADED_HIGH = 1 # If set, the kernel is loaded high
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CAN_USE_HEAP = 0x80 # If set, the loader also has set
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# heap_end_ptr to tell how much
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# space behind setup.S can be used for
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# heap purposes.
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# Only the loader knows what is free
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.byte LOADED_HIGH
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.byte LOADED_HIGH # The kernel is to be loaded high
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setup_move_size: .word 0x8000 # size to move, when setup is not
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# loaded at 0x90000. We will move setup
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@ -369,7 +367,23 @@ relocatable_kernel: .byte 1
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relocatable_kernel: .byte 0
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#endif
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min_alignment: .byte MIN_KERNEL_ALIGN_LG2 # minimum alignment
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pad3: .word 0
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xloadflags:
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#ifdef CONFIG_X86_64
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# define XLF0 XLF_KERNEL_64 /* 64-bit kernel */
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#else
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# define XLF0 0
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#endif
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#ifdef CONFIG_EFI_STUB
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# ifdef CONFIG_X86_64
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# define XLF23 XLF_EFI_HANDOVER_64 /* 64-bit EFI handover ok */
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# else
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# define XLF23 XLF_EFI_HANDOVER_32 /* 32-bit EFI handover ok */
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# endif
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#else
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# define XLF23 0
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#endif
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.word XLF0 | XLF23
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cmdline_size: .long COMMAND_LINE_SIZE-1 #length of the command line,
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#added with boot protocol
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@ -397,8 +411,13 @@ pref_address: .quad LOAD_PHYSICAL_ADDR # preferred load addr
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#define INIT_SIZE VO_INIT_SIZE
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#endif
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init_size: .long INIT_SIZE # kernel initialization size
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handover_offset: .long 0x30 # offset to the handover
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handover_offset:
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#ifdef CONFIG_EFI_STUB
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.long 0x30 # offset to the handover
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# protocol entry point
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#else
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.long 0
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#endif
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# End of setup header #####################################################
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@ -13,7 +13,7 @@ SECTIONS
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.bstext : { *(.bstext) }
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.bsdata : { *(.bsdata) }
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. = 497;
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. = 495;
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.header : { *(.header) }
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.entrytext : { *(.entrytext) }
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.inittext : { *(.inittext) }
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@ -1,6 +1,31 @@
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#ifndef _ASM_X86_BOOTPARAM_H
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#define _ASM_X86_BOOTPARAM_H
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/* setup_data types */
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#define SETUP_NONE 0
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#define SETUP_E820_EXT 1
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#define SETUP_DTB 2
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#define SETUP_PCI 3
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/* ram_size flags */
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#define RAMDISK_IMAGE_START_MASK 0x07FF
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#define RAMDISK_PROMPT_FLAG 0x8000
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#define RAMDISK_LOAD_FLAG 0x4000
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/* loadflags */
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#define LOADED_HIGH (1<<0)
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#define QUIET_FLAG (1<<5)
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#define KEEP_SEGMENTS (1<<6)
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#define CAN_USE_HEAP (1<<7)
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/* xloadflags */
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#define XLF_KERNEL_64 (1<<0)
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#define XLF_CAN_BE_LOADED_ABOVE_4G (1<<1)
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#define XLF_EFI_HANDOVER_32 (1<<2)
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#define XLF_EFI_HANDOVER_64 (1<<3)
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#ifndef __ASSEMBLY__
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#include <linux/types.h>
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#include <linux/screen_info.h>
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#include <linux/apm_bios.h>
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@ -9,12 +34,6 @@
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#include <asm/ist.h>
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#include <video/edid.h>
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/* setup data types */
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#define SETUP_NONE 0
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#define SETUP_E820_EXT 1
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#define SETUP_DTB 2
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#define SETUP_PCI 3
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/* extensible setup data list node */
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struct setup_data {
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__u64 next;
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@ -28,9 +47,6 @@ struct setup_header {
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__u16 root_flags;
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__u32 syssize;
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__u16 ram_size;
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#define RAMDISK_IMAGE_START_MASK 0x07FF
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#define RAMDISK_PROMPT_FLAG 0x8000
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#define RAMDISK_LOAD_FLAG 0x4000
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__u16 vid_mode;
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__u16 root_dev;
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__u16 boot_flag;
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@ -42,10 +58,6 @@ struct setup_header {
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__u16 kernel_version;
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__u8 type_of_loader;
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__u8 loadflags;
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#define LOADED_HIGH (1<<0)
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#define QUIET_FLAG (1<<5)
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#define KEEP_SEGMENTS (1<<6)
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#define CAN_USE_HEAP (1<<7)
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__u16 setup_move_size;
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__u32 code32_start;
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__u32 ramdisk_image;
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@ -58,7 +70,8 @@ struct setup_header {
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__u32 initrd_addr_max;
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__u32 kernel_alignment;
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__u8 relocatable_kernel;
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__u8 _pad2[3];
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__u8 min_alignment;
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__u16 xloadflags;
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__u32 cmdline_size;
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__u32 hardware_subarch;
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__u64 hardware_subarch_data;
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@ -106,7 +119,10 @@ struct boot_params {
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__u8 hd1_info[16]; /* obsolete! */ /* 0x090 */
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struct sys_desc_table sys_desc_table; /* 0x0a0 */
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struct olpc_ofw_header olpc_ofw_header; /* 0x0b0 */
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__u8 _pad4[128]; /* 0x0c0 */
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__u32 ext_ramdisk_image; /* 0x0c0 */
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__u32 ext_ramdisk_size; /* 0x0c4 */
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__u32 ext_cmd_line_ptr; /* 0x0c8 */
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__u8 _pad4[116]; /* 0x0cc */
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struct edid_info edid_info; /* 0x140 */
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struct efi_info efi_info; /* 0x1c0 */
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__u32 alt_mem_k; /* 0x1e0 */
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@ -115,7 +131,20 @@ struct boot_params {
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__u8 eddbuf_entries; /* 0x1e9 */
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__u8 edd_mbr_sig_buf_entries; /* 0x1ea */
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__u8 kbd_status; /* 0x1eb */
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__u8 _pad6[5]; /* 0x1ec */
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__u8 _pad5[3]; /* 0x1ec */
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/*
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* The sentinel is set to a nonzero value (0xff) in header.S.
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*
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* A bootloader is supposed to only take setup_header and put
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* it into a clean boot_params buffer. If it turns out that
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* it is clumsy or too generous with the buffer, it most
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* probably will pick up the sentinel variable too. The fact
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* that this variable then is still 0xff will let kernel
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* know that some variables in boot_params are invalid and
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* kernel should zero out certain portions of boot_params.
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*/
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__u8 sentinel; /* 0x1ef */
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__u8 _pad6[1]; /* 0x1f0 */
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struct setup_header hdr; /* setup header */ /* 0x1f1 */
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__u8 _pad7[0x290-0x1f1-sizeof(struct setup_header)];
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__u32 edd_mbr_sig_buffer[EDD_MBR_SIG_MAX]; /* 0x290 */
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@ -134,6 +163,6 @@ enum {
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X86_NR_SUBARCHS,
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};
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_X86_BOOTPARAM_H */
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