[PATCH -mm 1/4] x86_64 boot: Add free_early to early reservationmachanism

From: Huang, Ying
Date: Thu Mar 27 2008 - 03:11:18 EST


Add free_early to early reservation mechanism.

Signed-off-by: Huang Ying <ying.huang@xxxxxxxxx>

---
arch/x86/kernel/e820_64.c | 17 +++++++++++++++++
include/asm-x86/e820_64.h | 1 +
2 files changed, 18 insertions(+)

--- a/arch/x86/kernel/e820_64.c
+++ b/arch/x86/kernel/e820_64.c
@@ -84,6 +84,23 @@ void __init reserve_early(unsigned long
strncpy(r->name, name, sizeof(r->name) - 1);
}

+void __init free_early(unsigned long start, unsigned long end)
+{
+ int i, j;
+ struct early_res *r;
+ 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;
--- a/include/asm-x86/e820_64.h
+++ b/include/asm-x86/e820_64.h
@@ -41,6 +41,7 @@ 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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