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x86: Add find_early_area_size

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Prepare to move bck find_e820_area_size back to e820.c.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <1265793639-15071-22-git-send-email-yinghai@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Yinghai Lu 2010-02-10 01:20:25 -08:00 committed by H. Peter Anvin
parent a678c2be75
commit 7da657d1f1
1 changed files with 32 additions and 13 deletions
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45
arch/x86/kernel/early_res.c
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@ -476,6 +476,29 @@ out:
return -1ULL;
}
u64 __init find_early_area_size(u64 ei_start, u64 ei_last, u64 start,
u64 *sizep, u64 align)
{
u64 addr, last;
addr = round_up(ei_start, align);
if (addr < start)
addr = round_up(start, align);
if (addr >= ei_last)
goto out;
*sizep = ei_last - addr;
while (bad_addr_size(&addr, sizep, align) && addr + *sizep <= ei_last)
;
last = addr + *sizep;
if (last > ei_last)
goto out;
return addr;
out:
return -1ULL;
}
/*
* Find a free area with specified alignment in a specific range.
*/
@ -513,24 +536,20 @@ u64 __init find_e820_area_size(u64 start, u64 *sizep, u64 align)
for (i = 0; i < e820.nr_map; i++) {
struct e820entry *ei = &e820.map[i];
u64 addr, last;
u64 ei_last;
u64 addr;
u64 ei_start, ei_last;
if (ei->type != E820_RAM)
continue;
addr = round_up(ei->addr, align);
ei_last = ei->addr + ei->size;
if (addr < start)
addr = round_up(start, align);
if (addr >= ei_last)
continue;
*sizep = ei_last - addr;
while (bad_addr_size(&addr, sizep, align) &&
addr + *sizep <= ei_last)
;
last = addr + *sizep;
if (last > ei_last)
ei_start = ei->addr;
addr = find_early_area_size(ei_start, ei_last, start,
sizep, align);
if (addr == -1ULL)
continue;
return addr;
}