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x86, boot: Define the 2.12 bzImage boot protocol

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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
2013-01-27 10:43:28 -08:00
parent 65315d4889
commit 09c205afde
5 changed files with 106 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

63
arch/x86/include/uapi/asm/bootparam.h
View File

@@ -1,6 +1,31 @@
#ifndef _ASM_X86_BOOTPARAM_H
#define _ASM_X86_BOOTPARAM_H
/* setup_data types */
#define SETUP_NONE 0
#define SETUP_E820_EXT 1
#define SETUP_DTB 2
#define SETUP_PCI 3
/* ram_size flags */
#define RAMDISK_IMAGE_START_MASK 0x07FF
#define RAMDISK_PROMPT_FLAG 0x8000
#define RAMDISK_LOAD_FLAG 0x4000
/* loadflags */
#define LOADED_HIGH (1<<0)
#define QUIET_FLAG (1<<5)
#define KEEP_SEGMENTS (1<<6)
#define CAN_USE_HEAP (1<<7)
/* xloadflags */
#define XLF_KERNEL_64 (1<<0)
#define XLF_CAN_BE_LOADED_ABOVE_4G (1<<1)
#define XLF_EFI_HANDOVER_32 (1<<2)
#define XLF_EFI_HANDOVER_64 (1<<3)
#ifndef __ASSEMBLY__
#include <linux/types.h>
#include <linux/screen_info.h>
#include <linux/apm_bios.h>
@@ -9,12 +34,6 @@
#include <asm/ist.h>
#include <video/edid.h>
/* setup data types */
#define SETUP_NONE 0
#define SETUP_E820_EXT 1
#define SETUP_DTB 2
#define SETUP_PCI 3
/* extensible setup data list node */
struct setup_data {
__u64 next;
@@ -28,9 +47,6 @@ struct setup_header {
__u16 root_flags;
__u32 syssize;
__u16 ram_size;
#define RAMDISK_IMAGE_START_MASK 0x07FF
#define RAMDISK_PROMPT_FLAG 0x8000
#define RAMDISK_LOAD_FLAG 0x4000
__u16 vid_mode;
__u16 root_dev;
__u16 boot_flag;
@@ -42,10 +58,6 @@ struct setup_header {
__u16 kernel_version;
__u8 type_of_loader;
__u8 loadflags;
#define LOADED_HIGH (1<<0)
#define QUIET_FLAG (1<<5)
#define KEEP_SEGMENTS (1<<6)
#define CAN_USE_HEAP (1<<7)
__u16 setup_move_size;
__u32 code32_start;
__u32 ramdisk_image;
@@ -58,7 +70,8 @@ struct setup_header {
__u32 initrd_addr_max;
__u32 kernel_alignment;
__u8 relocatable_kernel;
__u8 _pad2[3];
__u8 min_alignment;
__u16 xloadflags;
__u32 cmdline_size;
__u32 hardware_subarch;
__u64 hardware_subarch_data;
@@ -106,7 +119,10 @@ struct boot_params {
__u8 hd1_info[16]; /* obsolete! */ /* 0x090 */
struct sys_desc_table sys_desc_table; /* 0x0a0 */
struct olpc_ofw_header olpc_ofw_header; /* 0x0b0 */
__u8 _pad4[128]; /* 0x0c0 */
__u32 ext_ramdisk_image; /* 0x0c0 */
__u32 ext_ramdisk_size; /* 0x0c4 */
__u32 ext_cmd_line_ptr; /* 0x0c8 */
__u8 _pad4[116]; /* 0x0cc */
struct edid_info edid_info; /* 0x140 */
struct efi_info efi_info; /* 0x1c0 */
__u32 alt_mem_k; /* 0x1e0 */
@@ -115,7 +131,20 @@ struct boot_params {
__u8 eddbuf_entries; /* 0x1e9 */
__u8 edd_mbr_sig_buf_entries; /* 0x1ea */
__u8 kbd_status; /* 0x1eb */
__u8 _pad6[5]; /* 0x1ec */
__u8 _pad5[3]; /* 0x1ec */
/*
* The sentinel is set to a nonzero value (0xff) in header.S.
*
* A bootloader is supposed to only take setup_header and put
* it into a clean boot_params buffer. If it turns out that
* it is clumsy or too generous with the buffer, it most
* probably will pick up the sentinel variable too. The fact
* that this variable then is still 0xff will let kernel
* know that some variables in boot_params are invalid and
* kernel should zero out certain portions of boot_params.
*/
__u8 sentinel; /* 0x1ef */
__u8 _pad6[1]; /* 0x1f0 */
struct setup_header hdr; /* setup header */ /* 0x1f1 */
__u8 _pad7[0x290-0x1f1-sizeof(struct setup_header)];
__u32 edd_mbr_sig_buffer[EDD_MBR_SIG_MAX]; /* 0x290 */
@@ -134,6 +163,6 @@ enum {
X86_NR_SUBARCHS,
};
#endif /* __ASSEMBLY__ */
#endif /* _ASM_X86_BOOTPARAM_H */