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[Qemu-devel] [PATCH RFC 08/13] range: add Range structure
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] [PATCH RFC 08/13] range: add Range structure |
Date: |
Mon, 13 May 2013 23:01:11 +0300 |
Sometimes we need to pass ranges around, add a
handy structure for this purpose.
Signed-off-by: Michael S. Tsirkin <address@hidden>
---
include/qemu/range.h | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/include/qemu/range.h b/include/qemu/range.h
index 3502372..4bcd346 100644
--- a/include/qemu/range.h
+++ b/include/qemu/range.h
@@ -1,6 +1,28 @@
#ifndef QEMU_RANGE_H
#define QEMU_RANGE_H
+#include <inttypes.h>
+
+/*
+ * Operations on 64 address ranges.
+ * Notes:
+ * - ranges must not wrap around 0, but can include the last byte ~0x0LL.
+ * - this can not represent a full 0 to ~0x0LL range.
+ */
+
+/* A structure representing a range of addresses. */
+struct Range {
+ uint64_t begin; /* First byte of the range, or 0 if empty. */
+ uint64_t end; /* 1 + the last byte. 0 if range empty or ends at ~0x0LL.
*/
+};
+typedef struct Range Range;
+
+/* verify that range is not empty and does not overlap */
+static inline bool range_valid(struct Range *range)
+{
+ return range->begin + 1 <= range->end;
+}
+
/* Get last byte of a range from offset + length.
* Undefined for ranges that wrap around 0. */
static inline uint64_t range_get_last(uint64_t offset, uint64_t len)
--
MST
- [Qemu-devel] [PATCH RFC 00/13] qemu: generate acpi tables for the guest, Michael S. Tsirkin, 2013/05/13
- [Qemu-devel] [PATCH RFC 03/13] refer to FWCfgState explicitly, Michael S. Tsirkin, 2013/05/13
- [Qemu-devel] [PATCH RFC 02/13] hw/i386/pc.c: move IO_APIC_DEFAULT_ADDRESS to include/hw/i386/apic.h, Michael S. Tsirkin, 2013/05/13
- [Qemu-devel] [PATCH RFC 01/13] apic: rename apic specific bitopts, Michael S. Tsirkin, 2013/05/13
- [Qemu-devel] [PATCH RFC 04/13] fw_cfg: move typedef to qemu/typedefs.h, Michael S. Tsirkin, 2013/05/13
- [Qemu-devel] [PATCH RFC 06/13] acpi: add rules to compile ASL source, Michael S. Tsirkin, 2013/05/13
- [Qemu-devel] [PATCH RFC 05/13] i386: add ACPI table files from seabios, Michael S. Tsirkin, 2013/05/13
- [Qemu-devel] [PATCH RFC 08/13] range: add Range structure,
Michael S. Tsirkin <=
- [Qemu-devel] [PATCH RFC 13/13] pc: reuse guest info for legacy fw cfg, Michael S. Tsirkin, 2013/05/13
- [Qemu-devel] [PATCH RFC 09/13] i386: add bios linker/loader, Michael S. Tsirkin, 2013/05/13
- [Qemu-devel] [PATCH RFC 07/13] acpi: pre-compiled ASL files, Michael S. Tsirkin, 2013/05/13
- [Qemu-devel] [PATCH RFC 10/13] i386: generate pc guest info, Michael S. Tsirkin, 2013/05/13
- [Qemu-devel] [PATCH RFC 11/13] pc: pass PCI hole ranges to Guests, Michael S. Tsirkin, 2013/05/13