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[Qemu-devel] [PULL 08/23] bitops: Add MAKE_64BIT_MASK macro
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [PULL 08/23] bitops: Add MAKE_64BIT_MASK macro |
Date: |
Mon, 4 Jul 2016 13:22:39 +0100 |
From: Alistair Francis <address@hidden>
Add a macro that creates a 64bit value which has length number of ones
shifted across by the value of shift.
Signed-off-by: Alistair Francis <address@hidden>
Reviewed-by: Alex Bennée <address@hidden>
Reviewed-by: Peter Maydell <address@hidden>
Message-id: address@hidden
Signed-off-by: Peter Maydell <address@hidden>
---
include/qemu/bitops.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h
index 15418a8..98fb005 100644
--- a/include/qemu/bitops.h
+++ b/include/qemu/bitops.h
@@ -24,6 +24,9 @@
#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
+#define MAKE_64BIT_MASK(shift, length) \
+ (((~0ULL) >> (64 - (length))) << (shift))
+
/**
* set_bit - Set a bit in memory
* @nr: the bit to set
--
1.9.1
- [Qemu-devel] [PULL 00/23] target-arm queue, Peter Maydell, 2016/07/04
- [Qemu-devel] [PULL 16/23] ssi: change ssi_slave_init to be a realize ops, Peter Maydell, 2016/07/04
- [Qemu-devel] [PULL 08/23] bitops: Add MAKE_64BIT_MASK macro,
Peter Maydell <=
- [Qemu-devel] [PULL 13/23] register: Add block initialise helper, Peter Maydell, 2016/07/04
- [Qemu-devel] [PULL 11/23] register: Define REG and FIELD macros, Peter Maydell, 2016/07/04
- [Qemu-devel] [PULL 10/23] register: Add Memory API glue, Peter Maydell, 2016/07/04
- [Qemu-devel] [PULL 23/23] ast2400: create SPI flash slaves, Peter Maydell, 2016/07/04
- [Qemu-devel] [PULL 06/23] armv7m_nvic: Use qemu_get_cpu(0) instead of current_cpu, Peter Maydell, 2016/07/04
- [Qemu-devel] [PULL 07/23] hw/arm/virt: mark the PCIe host controller as DMA coherent in the DT, Peter Maydell, 2016/07/04
- [Qemu-devel] [PULL 01/23] linux-user: Make semihosting heap/stack fields abi_ulongs, Peter Maydell, 2016/07/04
- [Qemu-devel] [PULL 21/23] ast2400: add SMC controllers (FMC and SPI), Peter Maydell, 2016/07/04
- [Qemu-devel] [PULL 17/23] m25p80: do not put iovec on the stack, Peter Maydell, 2016/07/04
- [Qemu-devel] [PULL 05/23] memory: Assert that memory_region_init_rom_device() ops aren't NULL, Peter Maydell, 2016/07/04