This patch adds support to XenBusDxe for executing on ARM and AArch64 machines (the former only when built with GCC).
Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org> --- OvmfPkg/XenBusDxe/AtomicsGcc.c | 44 +++++++++++++++++++++++++++++++++++++++++ OvmfPkg/XenBusDxe/XenBusDxe.inf | 3 +++ 2 files changed, 47 insertions(+) create mode 100644 OvmfPkg/XenBusDxe/AtomicsGcc.c diff --git a/OvmfPkg/XenBusDxe/AtomicsGcc.c b/OvmfPkg/XenBusDxe/AtomicsGcc.c new file mode 100644 index 000000000000..a0bdcbf67440 --- /dev/null +++ b/OvmfPkg/XenBusDxe/AtomicsGcc.c @@ -0,0 +1,44 @@ +/** @file + Arch-independent implementations of XenBusDxe atomics using GCC __builtins + + Copyright (C) 2014, Linaro Ltd. + + This program and the accompanying materials + are licensed and made available under the terms and conditions of the BSD License + which accompanies this distribution. The full text of the license may be found at + http://opensource.org/licenses/bsd-license.php + + THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, + WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. + +**/ + +UINT16 +EFIAPI +InternalSyncCompareExchange16 ( + IN volatile UINT16 *Value, + IN UINT16 CompareValue, + IN UINT16 ExchangeValue + ) +{ + return __sync_val_compare_and_swap_2 (Value, CompareValue, ExchangeValue); +} + +INT32 +EFIAPI +TestAndClearBit ( + IN INT32 Bit, + IN volatile VOID *Address + ) +{ + // + // Calculate the effective address relative to 'Address' based on the + // higher order bits of 'Bit'. Use signed shift instead of division to + // ensure we round towards -Inf, and end up with a positive shift in 'Bit', + // even if 'Bit' itself is negative. + // + Address += (Bit >> 5) * sizeof(INT32); + Bit &= 31; + + return (__sync_fetch_and_and_4 (Address, ~(1U << Bit)) & (1U << Bit)) != 0; +} diff --git a/OvmfPkg/XenBusDxe/XenBusDxe.inf b/OvmfPkg/XenBusDxe/XenBusDxe.inf index 31553ac5a64a..949ec0a0c732 100644 --- a/OvmfPkg/XenBusDxe/XenBusDxe.inf +++ b/OvmfPkg/XenBusDxe/XenBusDxe.inf @@ -54,6 +54,9 @@ X64/InterlockedCompareExchange16.nasm X64/TestAndClearBit.nasm +[Sources.AARCH64, Sources.ARM] + AtomicsGcc.c | GCC + [LibraryClasses] UefiDriverEntryPoint UefiBootServicesTableLib -- 1.8.3.2 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
