From e7905fdf275fbb520de97df1eccdcd20e3d9aa6f Mon Sep 17 00:00:00 2001 From: EuAndreh Date: Fri, 25 Oct 2024 10:19:35 -0300 Subject: Move code to src/ and tests/ --- src/bolt_arm.go | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 src/bolt_arm.go (limited to 'src/bolt_arm.go') diff --git a/src/bolt_arm.go b/src/bolt_arm.go new file mode 100644 index 0000000..7e5cb4b --- /dev/null +++ b/src/bolt_arm.go @@ -0,0 +1,28 @@ +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 +} -- cgit v1.2.3