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Date: Tue, 20 Nov 2012 23:16:09 -0800
From: Yinghai Lu <yinghai@...nel.org>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
"H. Peter Anvin" <hpa@...or.com>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>,
linux-kernel@...r.kernel.org, Yinghai Lu <yinghai@...nel.org>,
Rob Landley <rob@...dley.net>,
Matt Fleming <matt.fleming@...el.com>
Subject: [PATCH v3 11/12] x86, boot: add fields to support load bzImage and ramdisk high
ext_ramdisk_image/size will record high 32bits for ramdisk info.
xloadflags bit0 will be set if relocatable with 64bit.
Let get_ramdisk_image/size to use ext_ramdisk_image/size to get
right positon for ramdisk.
bootloader will fill value to ext_ramdisk_image/size when it load
ramdisk high.
Also bootloader will check if xloadflags bit0 is set to decicde if
it could load ramdisk high above 4G.
Update header version to 2.12.
-v2: add ext_cmd_line_ptr for above 4G support.
-v3: update to xloadflags from HPA
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Cc: Rob Landley <rob@...dley.net>
Cc: Matt Fleming <matt.fleming@...el.com>
---
Documentation/x86/boot.txt | 40 +++++++++++++++++++++++++++++++++++-
arch/x86/boot/compressed/cmdline.c | 3 ++
arch/x86/boot/header.S | 16 ++++++++++++-
arch/x86/include/asm/bootparam.h | 6 ++++-
arch/x86/kernel/head64.c | 3 ++
arch/x86/kernel/setup.c | 6 +++++
6 files changed, 70 insertions(+), 4 deletions(-)
diff --git a/Documentation/x86/boot.txt b/Documentation/x86/boot.txt
index 9efceff..a8263f7 100644
--- a/Documentation/x86/boot.txt
+++ b/Documentation/x86/boot.txt
@@ -57,6 +57,9 @@ Protocol 2.10: (Kernel 2.6.31) Added a protocol for relaxed alignment
Protocol 2.11: (Kernel 3.6) Added a field for offset of EFI handover
protocol entry point.
+Protocol 2.12: (Kernel 3.9) Added three fields for loading bzImage and
+ ramdisk above 4G with 64bit.
+
**** MEMORY LAYOUT
The traditional memory map for the kernel loader, used for Image or
@@ -182,7 +185,7 @@ Offset Proto Name Meaning
0230/4 2.05+ kernel_alignment Physical addr alignment required for kernel
0234/1 2.05+ relocatable_kernel Whether kernel is relocatable or not
0235/1 2.10+ min_alignment Minimum alignment, as a power of two
-0236/2 N/A pad3 Unused
+0236/2 2.12+ xloadflags Boot protocal option flags
0238/4 2.06+ cmdline_size Maximum size of the kernel command line
023C/4 2.07+ hardware_subarch Hardware subarchitecture
0240/8 2.07+ hardware_subarch_data Subarchitecture-specific data
@@ -193,6 +196,9 @@ Offset Proto Name Meaning
0258/8 2.10+ pref_address Preferred loading address
0260/4 2.10+ init_size Linear memory required during initialization
0264/4 2.11+ handover_offset Offset of handover entry point
+0268/4 2.12+ ext_ramdisk_image ramdisk_image 32 bits
+026C/4 2.12+ ext_ramdisk_size ramdisk_size high 32 bits
+0270/4 2.12+ ext_cmd_line_ptr cmd_line_ptr high 32 bits
(1) For backwards compatibility, if the setup_sects field contains 0, the
real value is 4.
@@ -581,6 +587,16 @@ Protocol: 2.10+
misaligned kernel. Therefore, a loader should typically try each
power-of-two alignment from kernel_alignment down to this alignment.
+Field name: xloadflags
+Type: modify (obligatory)
+Offset/size: 0x236/2
+Protocol: 2.12+
+
+ This field is a bitmask.
+
+ Bit 0 (read): LOADED_ABOVE_4G
+ - If 1, kernel/boot_params/cmdline/ramdisk could be above 4g
+
Field name: cmdline_size
Type: read
Offset/size: 0x238/4
@@ -707,6 +723,28 @@ Offset/size: 0x264/4
See EFI HANDOVER PROTOCOL below for more details.
+Field name: ext_ramdisk_image
+Type: write
+Offset/size: 0x268/4
+Protocol: 2.12+
+
+ The high 32-bit linear address of the initial ramdisk or ramfs. Leave at
+ zero if there is no initial ramdisk/ramfs, or under 4G.
+
+Field name: ext_ramdisk_size
+Type: write
+Offset/size: 0x26c/4
+Protocol: 2.12+
+
+ High 32-bit size of the initial ramdisk or ramfs. Leave at zero if there
+ is no initial ramdisk/ramfs.
+
+Field name: ext_cmd_line_ptr
+Type: write
+Offset/size: 0x270/4
+Protocol: 2.12+
+
+ cmd_line_ptr high 32 bits. Leave at zero if under 4G.
**** THE IMAGE CHECKSUM
diff --git a/arch/x86/boot/compressed/cmdline.c b/arch/x86/boot/compressed/cmdline.c
index b4c913c..00678d3 100644
--- a/arch/x86/boot/compressed/cmdline.c
+++ b/arch/x86/boot/compressed/cmdline.c
@@ -17,6 +17,9 @@ static unsigned long get_cmd_line_ptr(void)
{
unsigned long cmd_line_ptr = real_mode->hdr.cmd_line_ptr;
+ if (real_mode->hdr.version >= 0x020c)
+ cmd_line_ptr |= (u64)real_mode->hdr.ext_cmd_line_ptr << 32;
+
return cmd_line_ptr;
}
int cmdline_find_option(const char *option, char *buffer, int bufsize)
diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S
index 2a01744..598cba5 100644
--- a/arch/x86/boot/header.S
+++ b/arch/x86/boot/header.S
@@ -279,7 +279,7 @@ _start:
# Part 2 of the header, from the old setup.S
.ascii "HdrS" # header signature
- .word 0x020b # header version number (>= 0x0105)
+ .word 0x020c # header version number (>= 0x0105)
# or else old loadlin-1.5 will fail)
.globl realmode_swtch
realmode_swtch: .word 0, 0 # default_switch, SETUPSEG
@@ -369,7 +369,15 @@ relocatable_kernel: .byte 1
relocatable_kernel: .byte 0
#endif
min_alignment: .byte MIN_KERNEL_ALIGN_LG2 # minimum alignment
-pad3: .word 0
+
+xloadflags:
+LOADED_ABOVE_4G = 1 # If set, the kernel/boot_param/
+ # ramdisk could be loaded above 4g
+#if defined(CONFIG_X86_64) && defined(CONFIG_RELOCATABLE)
+ .word LOADED_ABOVE_4G
+#else
+ .word 0
+#endif
cmdline_size: .long COMMAND_LINE_SIZE-1 #length of the command line,
#added with boot protocol
@@ -400,6 +408,10 @@ init_size: .long INIT_SIZE # kernel initialization size
handover_offset: .long 0x30 # offset to the handover
# protocol entry point
+ext_ramdisk_image: .long 0 # ramdisk_image high 32 bits
+ext_ramdisk_size: .long 0 # ramdisk_size high 32 bits
+ext_cmd_line_ptr: .long 0 # cmd_line_ptr high 32 bits.
+
# End of setup header #####################################################
.section ".entrytext", "ax"
diff --git a/arch/x86/include/asm/bootparam.h b/arch/x86/include/asm/bootparam.h
index 2ad874c..036a278 100644
--- a/arch/x86/include/asm/bootparam.h
+++ b/arch/x86/include/asm/bootparam.h
@@ -57,7 +57,8 @@ 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;
@@ -67,6 +68,9 @@ struct setup_header {
__u64 pref_address;
__u32 init_size;
__u32 handover_offset;
+ __u32 ext_ramdisk_image;
+ __u32 ext_ramdisk_size;
+ __u32 ext_cmd_line_ptr;
} __attribute__((packed));
struct sys_desc_table {
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 735cd47..7a969a7 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -45,6 +45,9 @@ static unsigned long get_cmd_line_ptr(void)
{
unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
+ if (boot_params.hdr.version >= 0x020c)
+ cmd_line_ptr |= (u64)boot_params.hdr.ext_cmd_line_ptr << 32;
+
return cmd_line_ptr;
}
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index 573fa7d7..6a0ffa3 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -302,12 +302,18 @@ static u64 __init get_ramdisk_image(void)
{
u64 ramdisk_image = boot_params.hdr.ramdisk_image;
+ if (boot_params.hdr.version >= 0x020c)
+ ramdisk_image |= (u64)boot_params.hdr.ext_ramdisk_image << 32;
+
return ramdisk_image;
}
static u64 __init get_ramdisk_size(void)
{
u64 ramdisk_size = boot_params.hdr.ramdisk_size;
+ if (boot_params.hdr.version >= 0x020c)
+ ramdisk_size |= (u64)boot_params.hdr.ext_ramdisk_size << 32;
+
return ramdisk_size;
}
--
1.7.7
--
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