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x86, boot: add free_early to early reservation machanism

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Add free_early to early reservation mechanism - this way early bootup
failure paths can stop wasting memory.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Huang, Ying 2008-03-28 10:49:42 +08:00 committed by Ingo Molnar
parent 4a27214d7b
commit 50eae2a7c9
2 changed files with 23 additions and 0 deletions
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22
arch/x86/kernel/e820_64.c
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@ -84,6 +84,28 @@ void __init reserve_early(unsigned long start, unsigned long end, char *name)
strncpy(r->name, name, sizeof(r->name) - 1);
}
void __init free_early(unsigned long start, unsigned long end)
{
struct early_res *r;
int i, j;
for (i = 0; i < MAX_EARLY_RES && early_res[i].end; i++) {
r = &early_res[i];
if (start == r->start && end == r->end)
break;
}
if (i >= MAX_EARLY_RES || !early_res[i].end)
panic("free_early on not reserved area: %lx-%lx!", start, end);
for (j = i + 1; j < MAX_EARLY_RES && early_res[j].end; j++)
;
memcpy(&early_res[i], &early_res[i + 1],
(j - 1 - i) * sizeof(struct early_res));
early_res[j - 1].end = 0;
}
void __init early_res_to_bootmem(void)
{
int i;

1
include/asm-x86/e820_64.h
View File

@ -48,6 +48,7 @@ extern struct e820map e820;
extern void update_e820(void);
extern void reserve_early(unsigned long start, unsigned long end, char *name);
extern void free_early(unsigned long start, unsigned long end);
extern void early_res_to_bootmem(void);
#endif/*!__ASSEMBLY__*/