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authorHuang, Ying <ying.huang@intel.com>2008-03-28 10:49:42 +0800
committerIngo Molnar <mingo@elte.hu>2008-04-26 21:34:42 +0200
commit50eae2a7c9862afe263a2003c12f457ecfc9e6a2 (patch)
tree96e8e53c168c4c4cc983f629151091c17014be3b
parent4a27214d7be31e122db4102166f49ec15958e8e9 (diff)
downloadop-kernel-dev-50eae2a7c9862afe263a2003c12f457ecfc9e6a2.zip
op-kernel-dev-50eae2a7c9862afe263a2003c12f457ecfc9e6a2.tar.gz
x86, boot: add free_early to early reservation machanism
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>
-rw-r--r--arch/x86/kernel/e820_64.c22
-rw-r--r--include/asm-x86/e820_64.h1
2 files changed, 23 insertions, 0 deletions
diff --git a/arch/x86/kernel/e820_64.c b/arch/x86/kernel/e820_64.c
index cbd42e5..79f0d52 100644
--- a/arch/x86/kernel/e820_64.c
+++ b/arch/x86/kernel/e820_64.c
@@ -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;
diff --git a/include/asm-x86/e820_64.h b/include/asm-x86/e820_64.h
index f478c57..b5e02e3 100644
--- a/include/asm-x86/e820_64.h
+++ b/include/asm-x86/e820_64.h
@@ -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__*/
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