diff options
| author | Yinghai Lu <yinghai@kernel.org> | 2010-02-10 01:20:25 -0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2010-02-12 09:42:39 -0800 |
| commit | 7da657d1f1dd27fa9d8289d5f7e53479c7fd3a95 (patch) | |
| tree | 1983c2f84554434eccb580fb55b59a3353bc3def | |
| parent | a678c2be75773e112f6d656a22a7f1645c4dbd6c (diff) | |
x86: Add find_early_area_size
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>
| -rw-r--r-- | arch/x86/kernel/early_res.c | 45 |
1 files changed, 32 insertions, 13 deletions
diff --git a/arch/x86/kernel/early_res.c b/arch/x86/kernel/early_res.c index 1cf2c2f9ea6..bfa1ba705d4 100644 --- a/arch/x86/kernel/early_res.c +++ b/arch/x86/kernel/early_res.c @@ -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; } |