diff options
| -rw-r--r-- | arch/x86/kernel/e820.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index 7053f4adb8e..e09c18c8f3c 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -916,6 +916,48 @@ void __init reserve_early_overlap_ok(u64 start, u64 end, char *name) __reserve_early(start, end, name, 1); } +static void __init __check_and_double_early_res(u64 start) +{ + u64 end, size, mem; + struct early_res *new; + + /* do we have enough slots left ? */ + if ((max_early_res - early_res_count) > max(max_early_res/8, 2)) + return; + + /* double it */ + end = max_pfn_mapped << PAGE_SHIFT; + size = sizeof(struct early_res) * max_early_res * 2; + mem = find_e820_area(start, end, size, sizeof(struct early_res)); + + if (mem == -1ULL) + panic("can not find more space for early_res array"); + + new = __va(mem); + /* save the first one for own */ + new[0].start = mem; + new[0].end = mem + size; + new[0].overlap_ok = 0; + /* copy old to new */ + if (early_res == early_res_x) { + memcpy(&new[1], &early_res[0], + sizeof(struct early_res) * max_early_res); + memset(&new[max_early_res+1], 0, + sizeof(struct early_res) * (max_early_res - 1)); + early_res_count++; + } else { + memcpy(&new[1], &early_res[1], + sizeof(struct early_res) * (max_early_res - 1)); + memset(&new[max_early_res], 0, + sizeof(struct early_res) * max_early_res); + } + memset(&early_res[0], 0, sizeof(struct early_res) * max_early_res); + early_res = new; + max_early_res *= 2; + printk(KERN_DEBUG "early_res array is doubled to %d at [%llx - %llx]\n", + max_early_res, mem, mem + size - 1); +} + /* * Most early reservations come here. * @@ -929,6 +971,8 @@ void __init reserve_early(u64 start, u64 end, char *name) if (start >= end) return; + __check_and_double_early_res(end); + drop_overlaps_that_are_ok(start, end); __reserve_early(start, end, name, 0); } @@ -957,6 +1001,10 @@ void __init early_res_to_bootmem(u64 start, u64 end) for (i = 0; i < max_early_res && early_res[i].end; i++) count++; + /* need to skip first one ?*/ + if (early_res != early_res_x) + idx = 1; + printk(KERN_INFO "(%d/%d early reservations) ==> bootmem [%010llx - %010llx]\n", count - idx, max_early_res, start, end); for (i = idx; i < count; i++) { @@ -974,6 +1022,11 @@ void __init early_res_to_bootmem(u64 start, u64 end) reserve_bootmem_generic(final_start, final_end - final_start, BOOTMEM_DEFAULT); } + /* clear them */ + memset(&early_res[0], 0, sizeof(struct early_res) * max_early_res); + early_res = NULL; + max_early_res = 0; + early_res_count = 0; } /* Check for already reserved areas */ |