mirror of
https://github.com/schollz/cowyo.git
synced 2023-08-10 21:13:00 +03:00
9ad5907b48
Former-commit-id: da2423082a10392910bbafcd7683c1c93d7aa556 [formerly 708ea8f31cde627a1b64a5a49c80b5faf571740e] [formerly f127dbccd73fbba2526cb7763c1fafccc926596c [formerly 4558c48cdf]]
Former-commit-id: c9d4a6c430c6c5f731e755f270bdf66f89eaa646 [formerly 291db3593d93e63d7234d85f49773ec34c867f1e]
Former-commit-id: d1a21b94fe3760e037c7c02a56ca933123a8cae7
29 lines
831 B
Go
29 lines
831 B
Go
package bolt
|
|
|
|
import "unsafe"
|
|
|
|
// maxMapSize represents the largest mmap size supported by Bolt.
|
|
const maxMapSize = 0x7FFFFFFF // 2GB
|
|
|
|
// maxAllocSize is the size used when creating array pointers.
|
|
const maxAllocSize = 0xFFFFFFF
|
|
|
|
// Are unaligned load/stores broken on this arch?
|
|
var brokenUnaligned bool
|
|
|
|
func init() {
|
|
// Simple check to see whether this arch handles unaligned load/stores
|
|
// correctly.
|
|
|
|
// ARM9 and older devices require load/stores to be from/to aligned
|
|
// addresses. If not, the lower 2 bits are cleared and that address is
|
|
// read in a jumbled up order.
|
|
|
|
// See http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka15414.html
|
|
|
|
raw := [6]byte{0xfe, 0xef, 0x11, 0x22, 0x22, 0x11}
|
|
val := *(*uint32)(unsafe.Pointer(uintptr(unsafe.Pointer(&raw)) + 2))
|
|
|
|
brokenUnaligned = val != 0x11222211
|
|
}
|