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kexec: add BSS to resource tree

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Add the BSS to the resource tree just as kernel text and kernel data are in
the resource tree.  The main reason behind this is to avoid crashkernel
reservation in that area.

While it's not strictly necessary to have the BSS in the resource tree (the
actual collision detection is done in the reserve_bootmem() function before),
the usage of the BSS resource should be presented to the user in /proc/iomem
just as Kernel data and Kernel code.

Note: The patch currently is only implemented for x86 and ia64 (because
efi_initialize_iomem_resources() has the same signature on i386 and ia64).

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Bernhard Walle <bwalle@suse.de>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@in.ibm.com>
Cc: <linux-arch@vger.kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Bernhard Walle 2007-10-21 16:42:01 -07:00 committed by Linus Torvalds
parent c03ab37cbe
commit 00bf4098be
8 changed files with 48 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/ia64/kernel/efi.c
View File

@ -1090,7 +1090,8 @@ efi_memmap_init(unsigned long *s, unsigned long *e)
void
efi_initialize_iomem_resources(struct resource *code_resource,
struct resource *data_resource)
struct resource *data_resource,
struct resource *bss_resource)
{
struct resource *res;
void *efi_map_start, *efi_map_end, *p;
@ -1171,6 +1172,7 @@ efi_initialize_iomem_resources(struct resource *code_resource,
*/
insert_resource(res, code_resource);
insert_resource(res, data_resource);
insert_resource(res, bss_resource);
#ifdef CONFIG_KEXEC
insert_resource(res, &efi_memmap_res);
insert_resource(res, &boot_param_res);

14
arch/ia64/kernel/setup.c
View File

@ -90,7 +90,12 @@ static struct resource code_resource = {
.name = "Kernel code",
.flags = IORESOURCE_BUSY | IORESOURCE_MEM
};
extern char _text[], _end[], _etext[];
static struct resource bss_resource = {
.name = "Kernel bss",
.flags = IORESOURCE_BUSY | IORESOURCE_MEM
};
extern char _text[], _end[], _etext[], _edata[], _bss[];
unsigned long ia64_max_cacheline_size;
@ -200,8 +205,11 @@ static int __init register_memory(void)
code_resource.start = ia64_tpa(_text);
code_resource.end = ia64_tpa(_etext) - 1;
data_resource.start = ia64_tpa(_etext);
data_resource.end = ia64_tpa(_end) - 1;
efi_initialize_iomem_resources(&code_resource, &data_resource);
data_resource.end = ia64_tpa(_edata) - 1;
bss_resource.start = ia64_tpa(_bss);
bss_resource.end = ia64_tpa(_end) - 1;
efi_initialize_iomem_resources(&code_resource, &data_resource,
&bss_resource);
return 0;
}

18
arch/x86/kernel/e820_32.c
View File

@ -51,6 +51,13 @@ struct resource code_resource = {
.flags = IORESOURCE_BUSY | IORESOURCE_MEM
};
struct resource bss_resource = {
.name = "Kernel bss",
.start = 0,
.end = 0,
.flags = IORESOURCE_BUSY | IORESOURCE_MEM
};
static struct resource system_rom_resource = {
.name = "System ROM",
.start = 0xf0000,
@ -254,7 +261,9 @@ static void __init probe_roms(void)
* and also for regions reported as reserved by the e820.
*/
static void __init
legacy_init_iomem_resources(struct resource *code_resource, struct resource *data_resource)
legacy_init_iomem_resources(struct resource *code_resource,
struct resource *data_resource,
struct resource *bss_resource)
{
int i;
@ -287,6 +296,7 @@ legacy_init_iomem_resources(struct resource *code_resource, struct resource *dat
*/
request_resource(res, code_resource);
request_resource(res, data_resource);
request_resource(res, bss_resource);
#ifdef CONFIG_KEXEC
if (crashk_res.start != crashk_res.end)
request_resource(res, &crashk_res);
@ -307,9 +317,11 @@ static int __init request_standard_resources(void)
printk("Setting up standard PCI resources\n");
if (efi_enabled)
efi_initialize_iomem_resources(&code_resource, &data_resource);
efi_initialize_iomem_resources(&code_resource,
&data_resource, &bss_resource);
else
legacy_init_iomem_resources(&code_resource, &data_resource);
legacy_init_iomem_resources(&code_resource,
&data_resource, &bss_resource);
/* EFI systems may still have VGA */
request_resource(&iomem_resource, &video_ram_resource);

3
arch/x86/kernel/e820_64.c
View File

@ -47,7 +47,7 @@ unsigned long end_pfn_map;
*/
static unsigned long __initdata end_user_pfn = MAXMEM>>PAGE_SHIFT;
extern struct resource code_resource, data_resource;
extern struct resource code_resource, data_resource, bss_resource;
/* Check for some hardcoded bad areas that early boot is not allowed to touch */
static inline int bad_addr(unsigned long *addrp, unsigned long size)
@ -225,6 +225,7 @@ void __init e820_reserve_resources(void)
*/
request_resource(res, &code_resource);
request_resource(res, &data_resource);
request_resource(res, &bss_resource);
#ifdef CONFIG_KEXEC
if (crashk_res.start != crashk_res.end)
request_resource(res, &crashk_res);

4
arch/x86/kernel/efi_32.c
View File

@ -603,7 +603,8 @@ void __init efi_enter_virtual_mode(void)
void __init
efi_initialize_iomem_resources(struct resource *code_resource,
struct resource *data_resource)
struct resource *data_resource,
struct resource *bss_resource)
{
struct resource *res;
efi_memory_desc_t *md;
@ -675,6 +676,7 @@ efi_initialize_iomem_resources(struct resource *code_resource,
if (md->type == EFI_CONVENTIONAL_MEMORY) {
request_resource(res, code_resource);
request_resource(res, data_resource);
request_resource(res, bss_resource);
#ifdef CONFIG_KEXEC
request_resource(res, &crashk_res);
#endif

4
arch/x86/kernel/setup_32.c
View File

@ -60,6 +60,7 @@
#include <asm/vmi.h>
#include <setup_arch.h>
#include <bios_ebda.h>
#include <asm/cacheflush.h>
/* This value is set up by the early boot code to point to the value
immediately after the boot time page tables. It contains a *physical*
@ -73,6 +74,7 @@ int disable_pse __devinitdata = 0;
*/
extern struct resource code_resource;
extern struct resource data_resource;
extern struct resource bss_resource;
/* cpu data as detected by the assembly code in head.S */
struct cpuinfo_x86 new_cpu_data __cpuinitdata = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };
@ -600,6 +602,8 @@ void __init setup_arch(char **cmdline_p)
code_resource.end = virt_to_phys(_etext)-1;
data_resource.start = virt_to_phys(_etext);
data_resource.end = virt_to_phys(_edata)-1;
bss_resource.start = virt_to_phys(&__bss_start);
bss_resource.end = virt_to_phys(&__bss_stop)-1;
parse_early_param();

9
arch/x86/kernel/setup_64.c
View File

@ -58,6 +58,7 @@
#include <asm/numa.h>
#include <asm/sections.h>
#include <asm/dmi.h>
#include <asm/cacheflush.h>
/*
* Machine setup..
@ -133,6 +134,12 @@ struct resource code_resource = {
.end = 0,
.flags = IORESOURCE_RAM,
};
struct resource bss_resource = {
.name = "Kernel bss",
.start = 0,
.end = 0,
.flags = IORESOURCE_RAM,
};
#ifdef CONFIG_PROC_VMCORE
/* elfcorehdr= specifies the location of elf core header
@ -276,6 +283,8 @@ void __init setup_arch(char **cmdline_p)
code_resource.end = virt_to_phys(&_etext)-1;
data_resource.start = virt_to_phys(&_etext);
data_resource.end = virt_to_phys(&_edata)-1;
bss_resource.start = virt_to_phys(&__bss_start);
bss_resource.end = virt_to_phys(&__bss_stop)-1;
early_identify_cpu(&boot_cpu_data);

2
include/linux/efi.h
View File

@ -298,7 +298,7 @@ extern int efi_mem_attribute_range (unsigned long phys_addr, unsigned long size,
u64 attr);
extern int __init efi_uart_console_only (void);
extern void efi_initialize_iomem_resources(struct resource *code_resource,
struct resource *data_resource);
struct resource *data_resource, struct resource *bss_resource);
extern unsigned long efi_get_time(void);
extern int efi_set_rtc_mmss(unsigned long nowtime);
extern int is_available_memory(efi_memory_desc_t * md);