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Date: Fri, 12 Oct 2007 13:52:28 +0800
From: "Huang, Ying" <ying.huang@...el.com>
To: "H. Peter Anvin" <hpa@...or.com>, Andi Kleen <ak@...e.de>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
akpm@...ux-foundation.org, Yinghai Lu <yhlu.kernel@...il.com>,
Chandramouli Narayanan <mouli@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH -mm -v5 1/3] i386/x86_64 boot: setup data
This patch add a field of 64-bit physical pointer to NULL terminated
single linked list of struct setup_data to real-mode kernel
header. This is used as a more extensible boot parameters passing
mechanism.
Signed-off-by: Huang Ying <ying.huang@...el.com>
---
arch/i386/Kconfig | 3 -
arch/i386/boot/header.S | 8 +++
arch/i386/kernel/setup.c | 95 +++++++++++++++++++++++++++++++++++++++++++
arch/x86_64/kernel/setup.c | 37 ++++++++++++++++
include/asm-i386/bootparam.h | 15 ++++++
include/asm-i386/io.h | 7 +++
6 files changed, 161 insertions(+), 4 deletions(-)
Index: linux-2.6.23-rc8/include/asm-i386/bootparam.h
===================================================================
--- linux-2.6.23-rc8.orig/include/asm-i386/bootparam.h 2007-10-09 11:26:06.000000000 +0800
+++ linux-2.6.23-rc8/include/asm-i386/bootparam.h 2007-10-12 11:20:28.000000000 +0800
@@ -9,6 +9,17 @@
#include <asm/ist.h>
#include <video/edid.h>
+/* setup data types */
+#define SETUP_NONE 0
+
+/* extensible setup data list node */
+struct setup_data {
+ u64 next;
+ u32 type;
+ u32 len;
+ u8 data[0];
+} __attribute__((packed));
+
struct setup_header {
u8 setup_sects;
u16 root_flags;
@@ -41,6 +52,10 @@
u32 initrd_addr_max;
u32 kernel_alignment;
u8 relocatable_kernel;
+ u8 _pad2[3];
+ u32 cmdline_size;
+ u32 _pad3;
+ u64 setup_data;
} __attribute__((packed));
struct sys_desc_table {
Index: linux-2.6.23-rc8/arch/i386/boot/header.S
===================================================================
--- linux-2.6.23-rc8.orig/arch/i386/boot/header.S 2007-10-09 11:26:06.000000000 +0800
+++ linux-2.6.23-rc8/arch/i386/boot/header.S 2007-10-09 11:26:08.000000000 +0800
@@ -119,7 +119,7 @@
# Part 2 of the header, from the old setup.S
.ascii "HdrS" # header signature
- .word 0x0206 # header version number (>= 0x0105)
+ .word 0x0207 # header version number (>= 0x0105)
# or else old loadlin-1.5 will fail)
.globl realmode_swtch
realmode_swtch: .word 0, 0 # default_switch, SETUPSEG
@@ -214,6 +214,12 @@
#added with boot protocol
#version 2.06
+pad4: .long 0
+
+setup_data: .quad 0 # 64-bit physical pointer to
+ # single linked list of
+ # struct setup_data
+
# End of setup header #####################################################
.section ".inittext", "ax"
Index: linux-2.6.23-rc8/arch/x86_64/kernel/setup.c
===================================================================
--- linux-2.6.23-rc8.orig/arch/x86_64/kernel/setup.c 2007-10-09 11:26:06.000000000 +0800
+++ linux-2.6.23-rc8/arch/x86_64/kernel/setup.c 2007-10-12 11:20:28.000000000 +0800
@@ -250,6 +250,40 @@
ebda_size = 64*1024;
}
+static void __init parse_setup_data(void)
+{
+ struct setup_data *data;
+ unsigned long pa_data;
+
+ if (boot_params.hdr.version < 0x0207)
+ return;
+ pa_data = boot_params.hdr.setup_data;
+ while (pa_data) {
+ data = early_ioremap(pa_data, PAGE_SIZE);
+ switch (data->type) {
+ default:
+ break;
+ }
+ pa_data = data->next;
+ early_iounmap(data, PAGE_SIZE);
+ }
+}
+
+static void __init reserve_setup_data(void)
+{
+ struct setup_data *data;
+ unsigned long pa_data;
+
+ if (boot_params.hdr.version < 0x0207)
+ return;
+ pa_data = boot_params.hdr.setup_data;
+ while (pa_data) {
+ data = __va(pa_data);
+ reserve_bootmem_generic(pa_data, sizeof(*data)+data->len);
+ pa_data = data->next;
+ }
+}
+
void __init setup_arch(char **cmdline_p)
{
printk(KERN_INFO "Command line: %s\n", boot_command_line);
@@ -285,6 +319,8 @@
strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
*cmdline_p = command_line;
+ parse_setup_data();
+
parse_early_param();
finish_e820_parsing();
@@ -373,6 +409,7 @@
*/
acpi_reserve_bootmem();
#endif
+ reserve_setup_data();
/*
* Find and reserve possible boot-time SMP configuration:
*/
Index: linux-2.6.23-rc8/arch/i386/kernel/setup.c
===================================================================
--- linux-2.6.23-rc8.orig/arch/i386/kernel/setup.c 2007-10-09 11:26:06.000000000 +0800
+++ linux-2.6.23-rc8/arch/i386/kernel/setup.c 2007-10-12 11:20:29.000000000 +0800
@@ -424,6 +424,94 @@
{}
#endif
+static void __init reserve_setup_data(void)
+{
+ struct setup_data *data;
+ unsigned long max_low_addr = (max_low_pfn<<PAGE_SHIFT);
+ unsigned long pa_data, data_len;
+
+ if (boot_params.hdr.version < 0x0207)
+ return;
+ pa_data = boot_params.hdr.setup_data;
+ while (pa_data) {
+ data = boot_ioremap(pa_data, sizeof(*data));
+ data_len = sizeof(*data)+data->len;
+ if (pa_data+data_len <= max_low_addr)
+ reserve_bootmem(pa_data, data_len);
+ else if (pa_data < max_low_addr)
+ reserve_bootmem(pa_data, max_low_addr - pa_data);
+ pa_data = data->next;
+ }
+}
+
+/*
+ * The setup data in high memory can not be reserved by bootmem
+ * allocator, so they are copied to low memory.
+ */
+static void __init copy_setup_data(void)
+{
+ struct setup_data *data, *ndata;
+ u64 *ppa_next;
+ unsigned long data_len;
+
+ if (boot_params.hdr.version < 0x0207)
+ return;
+ ppa_next = &boot_params.hdr.setup_data;
+ while (*ppa_next) {
+ data = bt_ioremap(*ppa_next, sizeof(*data));
+ data_len = sizeof(*data)+data->len;
+ bt_iounmap(data, sizeof(*data));
+ if (*ppa_next+data_len > (max_low_pfn<<PAGE_SHIFT)) {
+ ndata = alloc_bootmem_low(data_len);
+ data = bt_ioremap(*ppa_next, data_len);
+ memcpy(ndata, data, data_len);
+ *ppa_next = __pa(ndata);
+ bt_iounmap(data, data_len);
+ }
+ ppa_next = &((struct setup_data *)__va(*ppa_next))->next;
+ }
+}
+
+static void __init parse_setup_data(void)
+{
+ struct setup_data *data;
+ unsigned long pa_data, pa_next;
+
+ if (boot_params.hdr.version < 0x0207)
+ return;
+ pa_data = boot_params.hdr.setup_data;
+ while (pa_data) {
+ data = boot_ioremap(pa_data, PAGE_SIZE);
+ pa_next = data->next;
+ switch (data->type) {
+ default:
+ break;
+ }
+ pa_data = pa_next;
+ }
+}
+
+/*
+ * The memory location of setup data may be changed after
+ * copy_setup_data, so late_parse_setup_data are provided for needed
+ * user.
+ */
+static void __init late_parse_setup_data(void)
+{
+ struct setup_data *data;
+
+ if (boot_params.hdr.version < 0x0207)
+ return;
+ for (data = __va(boot_params.hdr.setup_data);
+ data != __va(0);
+ data = __va(data->next)) {
+ switch (data->type) {
+ default:
+ break;
+ }
+ }
+}
+
void __init setup_bootmem_allocator(void)
{
unsigned long bootmap_size;
@@ -500,6 +588,7 @@
}
#endif
reserve_crashkernel();
+ reserve_setup_data();
}
/*
@@ -583,6 +672,9 @@
rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
#endif
+
+ parse_setup_data();
+
ARCH_SETUP
if (efi_enabled)
efi_init();
@@ -657,6 +749,9 @@
if (efi_enabled)
efi_map_memmap();
+ copy_setup_data();
+ late_parse_setup_data();
+
#ifdef CONFIG_ACPI
/*
* Parse the ACPI tables for possible boot-time SMP configuration.
Index: linux-2.6.23-rc8/include/asm-i386/io.h
===================================================================
--- linux-2.6.23-rc8.orig/include/asm-i386/io.h 2007-10-09 11:26:06.000000000 +0800
+++ linux-2.6.23-rc8/include/asm-i386/io.h 2007-10-09 11:26:08.000000000 +0800
@@ -126,6 +126,13 @@
extern void iounmap(volatile void __iomem *addr);
/*
+ * boot_ioremap is for temporary early boot-time mappings, before
+ * paging_init(), when the boot-time page tables are still in use.
+ * The mapping is currently limited to at most 4 pages.
+ */
+extern void *boot_ioremap(unsigned long offset, unsigned long size);
+
+/*
* bt_ioremap() and bt_iounmap() are for temporary early boot-time
* mappings, before the real ioremap() is functional.
* A boot-time mapping is currently limited to at most 16 pages.
Index: linux-2.6.23-rc8/arch/i386/Kconfig
===================================================================
--- linux-2.6.23-rc8.orig/arch/i386/Kconfig 2007-10-09 11:26:06.000000000 +0800
+++ linux-2.6.23-rc8/arch/i386/Kconfig 2007-10-09 11:26:08.000000000 +0800
@@ -784,11 +784,8 @@
The default yes will allow the kernel to do irq load balancing.
Saying no will keep the kernel from doing irq load balancing.
-# turning this on wastes a bunch of space.
-# Summit needs it only when NUMA is on
config BOOT_IOREMAP
bool
- depends on (((X86_SUMMIT || X86_GENERICARCH) && NUMA) || (X86 && EFI))
default y
config SECCOMP
-
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