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x86: add e820_remove_range

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... so could add real hole in e820

agp check is using request_mem_region, and could fail if e820 is reserved...

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-06-21 14:48:05 -07:00 committed by Ingo Molnar
parent 9a25034759
commit 7a1fd9866c
2 changed files with 37 additions and 0 deletions
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35
arch/x86/kernel/e820.c
View File

@ -429,6 +429,41 @@ u64 __init e820_update_range(u64 start, u64 size, unsigned old_type,
return real_updated_size;
}
/* make e820 not cover the range */
u64 __init e820_remove_range(u64 start, u64 size, unsigned old_type,
int checktype)
{
int i;
u64 real_removed_size = 0;
for (i = 0; i < e820.nr_map; i++) {
struct e820entry *ei = &e820.map[i];
u64 final_start, final_end;
if (checktype && ei->type != old_type)
continue;
/* totally covered? */
if (ei->addr >= start &&
(ei->addr + ei->size) <= (start + size)) {
real_removed_size += ei->size;
memset(ei, 0, sizeof(struct e820entry));
continue;
}
/* partially covered */
final_start = max(start, ei->addr);
final_end = min(start + size, ei->addr + ei->size);
if (final_start >= final_end)
continue;
real_removed_size += final_end - final_start;
ei->size -= final_end - final_start;
if (ei->addr < final_start)
continue;
ei->addr = final_end;
}
return real_removed_size;
}
void __init update_e820(void)
{
int nr_map;

2
include/asm-x86/e820.h
View File

@ -67,6 +67,8 @@ sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, int *pnr_map);
extern int copy_e820_map(struct e820entry *biosmap, int nr_map);
extern u64 e820_update_range(u64 start, u64 size, unsigned old_type,
unsigned new_type);
extern u64 e820_remove_range(u64 start, u64 size, unsigned old_type,
int checktype);
extern void update_e820(void);
extern void e820_setup_gap(void);
struct setup_data;