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[PATCH] kdump: x86_64: add memmmap command line option

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From: Vivek Goyal <vgoyal@in.ibm.com>

- This patch introduces the memmap option for x86_64 similar to i386.

- memmap=exactmap enables setting of an exact E820 memory map, as specified
  by the user.

Changes in this version:

- Used e820_end_of_ram() to find the max_pfn as suggested by Andi kleen.

- removed PFN_UP & PFN_DOWN macros

- Printing the user defined map also.

Signed-off-by: Murali M Chakravarthy <muralim@in.ibm.com>
Signed-off-by: Hariprasad Nellitheertha <nharipra@gmail.com>
Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
akpm@osdl.org 2006-01-09 20:51:46 -08:00 committed by Linus Torvalds
parent bf2083050d
commit 69cda7b1f0
4 changed files with 50 additions and 1 deletions
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2
Documentation/kernel-parameters.txt
View file

@ -832,7 +832,7 @@ running once the system is up.
mem=nopentium [BUGS=IA-32] Disable usage of 4MB pages for kernel
memory.
memmap=exactmap [KNL,IA-32] Enable setting of an exact
memmap=exactmap [KNL,IA-32,X86_64] Enable setting of an exact
E820 memory map, as specified by the user.
Such memmap=exactmap lines can be constructed based on
BIOS output or other requirements. See the memmap=nn@ss

21
arch/x86_64/kernel/e820.c
View file

@ -559,6 +559,27 @@ void __init parse_memopt(char *p, char **from)
end_user_pfn >>= PAGE_SHIFT;
}
void __init parse_memmapopt(char *p, char **from)
{
unsigned long long start_at, mem_size;
mem_size = memparse(p, from);
p = *from;
if (*p == '@') {
start_at = memparse(p+1, from);
add_memory_region(start_at, mem_size, E820_RAM);
} else if (*p == '#') {
start_at = memparse(p+1, from);
add_memory_region(start_at, mem_size, E820_ACPI);
} else if (*p == '$') {
start_at = memparse(p+1, from);
add_memory_region(start_at, mem_size, E820_RESERVED);
} else {
end_user_pfn = (mem_size >> PAGE_SHIFT);
}
p = *from;
}
unsigned long pci_mem_start = 0xaeedbabe;
/*

27
arch/x86_64/kernel/setup.c
View file

@ -275,6 +275,7 @@ static __init void parse_cmdline_early (char ** cmdline_p)
{
char c = ' ', *to = command_line, *from = COMMAND_LINE;
int len = 0;
int userdef = 0;
/* Save unparsed command line copy for /proc/cmdline */
memcpy(saved_command_line, COMMAND_LINE, COMMAND_LINE_SIZE);
@ -357,6 +358,28 @@ static __init void parse_cmdline_early (char ** cmdline_p)
if (!memcmp(from, "mem=", 4))
parse_memopt(from+4, &from);
if (!memcmp(from, "memmap=", 7)) {
/* exactmap option is for used defined memory */
if (!memcmp(from+7, "exactmap", 8)) {
#ifdef CONFIG_CRASH_DUMP
/* If we are doing a crash dump, we
* still need to know the real mem
* size before original memory map is
* reset.
*/
saved_max_pfn = e820_end_of_ram();
#endif
from += 8+7;
end_pfn_map = 0;
e820.nr_map = 0;
userdef = 1;
}
else {
parse_memmapopt(from+7, &from);
userdef = 1;
}
}
#ifdef CONFIG_NUMA
if (!memcmp(from, "numa=", 5))
numa_setup(from+5);
@ -403,6 +426,10 @@ static __init void parse_cmdline_early (char ** cmdline_p)
break;
*(to++) = c;
}
if (userdef) {
printk(KERN_INFO "user-defined physical RAM map:\n");
e820_print_map("user");
}
*to = '\0';
*cmdline_p = command_line;
}

1
include/asm-x86_64/e820.h
View file

@ -55,6 +55,7 @@ extern unsigned long e820_hole_size(unsigned long start_pfn,
unsigned long end_pfn);
extern void __init parse_memopt(char *p, char **end);
extern void __init parse_memmapopt(char *p, char **end);
extern struct e820map e820;
#endif/*!__ASSEMBLY__*/