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[S390] nss: Free unused memory in kernel image.

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With CONFIG_SHARED_KERNEL the kernel text segment that might be in a
read only memory sections starts at 1MB. Memory between 0x12000 and
0x100000 is unused then. Free this, so we have appr. an extra MB
of memory available.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2007-02-21 10:55:37 +01:00 committed by Martin Schwidefsky
parent 229d9c6dfb
commit 615b04b301
6 changed files with 19 additions and 30 deletions
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15
arch/s390/kernel/head31.S
View file

@ -148,20 +148,9 @@ startup_continue:
.Lstartup_init:
.long startup_init
.globl ipl_schib
ipl_schib:
.rept 13
.long 0
.endr
.globl ipl_flags
ipl_flags:
.long 0
.globl ipl_devno
ipl_devno:
.word 0
.org 0x12000
.globl _ehead
_ehead:
#ifdef CONFIG_SHARED_KERNEL
.org 0x100000
#endif

16
arch/s390/kernel/head64.S
View file

@ -154,21 +154,9 @@ startup_continue:
.Lparmaddr:
.quad PARMAREA
.globl ipl_schib
ipl_schib:
.rept 13
.long 0
.endr
.globl ipl_flags
ipl_flags:
.long 0
.globl ipl_devno
ipl_devno:
.word 0
.org 0x12000
.globl _ehead
_ehead:
#ifdef CONFIG_SHARED_KERNEL
.org 0x100000
#endif

7
arch/s390/kernel/ipl.c
View file

@ -43,6 +43,13 @@ enum ipl_type {
#define IPL_FCP_STR "fcp"
#define IPL_NSS_STR "nss"
/*
* Must be in data section since the bss section
* is not cleared when these are accessed.
*/
u16 ipl_devno __attribute__((__section__(".data"))) = 0;
u32 ipl_flags __attribute__((__section__(".data"))) = 0;
static char *ipl_type_str(enum ipl_type type)
{
switch (type) {

7
arch/s390/kernel/setup.c
View file

@ -690,8 +690,13 @@ setup_memory(void)
psw_set_key(PAGE_DEFAULT_KEY);
free_bootmem_with_active_regions(0, max_pfn);
reserve_bootmem(0, PFN_PHYS(start_pfn));
/*
* Reserve memory used for lowcore/command line/kernel image.
*/
reserve_bootmem(0, (unsigned long)_ehead);
reserve_bootmem((unsigned long)_stext,
PFN_PHYS(start_pfn) - (unsigned long)_stext);
/*
* Reserve the bootmem bitmap itself as well. We do this in two
* steps (first step was init_bootmem()) because this catches

2
drivers/s390/cio/cio.c
View file

@ -1048,7 +1048,7 @@ void reipl_ccw_dev(struct ccw_dev_id *devid)
do_reipl_asm(*((__u32*)&schid));
}
extern struct schib ipl_schib;
static struct schib __initdata ipl_schib;
/*
* ipl_save_parameters gets called very early. It is not allowed to access

2
include/asm-s390/sections.h
View file

@ -3,6 +3,6 @@
#include <asm-generic/sections.h>
extern char _eshared[];
extern char _eshared[], _ehead[];
#endif