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[Qemu-devel] [PATCH 3/7] memory: introduce memory_region_set_alias_offse
From: |
Avi Kivity |
Subject: |
[Qemu-devel] [PATCH 3/7] memory: introduce memory_region_set_alias_offset() |
Date: |
Thu, 15 Dec 2011 17:18:35 +0200 |
Add an API to update an alias offset of an active alias. This can be
used to simplify implementation of dynamic memory banks.
Signed-off-by: Avi Kivity <address@hidden>
---
memory.c | 14 ++++++++++++++
memory.h | 12 ++++++++++++
2 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/memory.c b/memory.c
index a080d21..7e842b3 100644
--- a/memory.c
+++ b/memory.c
@@ -1345,6 +1345,20 @@ void memory_region_set_address(MemoryRegion *mr,
target_phys_addr_t addr)
memory_region_transaction_commit();
}
+void memory_region_set_alias_offset(MemoryRegion *mr, target_phys_addr_t
offset)
+{
+ target_phys_addr_t old_offset = mr->alias_offset;
+
+ assert(mr->alias);
+ mr->alias_offset = offset;
+
+ if (offset == old_offset || !mr->parent) {
+ return;
+ }
+
+ memory_region_update_topology(mr);
+}
+
void set_system_memory_map(MemoryRegion *mr)
{
address_space_memory.root = mr;
diff --git a/memory.h b/memory.h
index db53422..c07bcca 100644
--- a/memory.h
+++ b/memory.h
@@ -529,6 +529,18 @@ void memory_region_set_enabled(MemoryRegion *mr, bool
enabled);
*/
void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr);
+/*
+ * memory_region_set_alias_offset: dynamically update a memory alias's offset
+ *
+ * Dynamically updates the offset into the target region that an alias points
+ * to, as if the fourth argument to memory_region_init_alias() has changed.
+ *
+ * @mr: the #MemoryRegion to be updated; should be an alias.
+ * @offset: the new offset into the target memory region
+ */
+void memory_region_set_alias_offset(MemoryRegion *mr,
+ target_phys_addr_t offset);
+
/* Start a transaction; changes will be accumulated and made visible only
* when the transaction ends.
*/
--
1.7.7.1
- [Qemu-devel] [PULL v3 0/7] Memory API mutators, Avi Kivity, 2011/12/15
- [Qemu-devel] [PATCH 3/7] memory: introduce memory_region_set_alias_offset(),
Avi Kivity <=
- [Qemu-devel] [PATCH 2/7] memory: introduce memory_region_set_address(), Avi Kivity, 2011/12/15
- [Qemu-devel] [PATCH 4/7] memory: optimize empty transactions due to mutators, Avi Kivity, 2011/12/15
- [Qemu-devel] [PATCH 7/7] docs: document memory API interaction with migration, Avi Kivity, 2011/12/15
- [Qemu-devel] [PATCH 6/7] piix_pci: adapt smram mapping to use memory mutators, Avi Kivity, 2011/12/15
- [Qemu-devel] [PATCH 5/7] cirrus_vga: adapt to memory mutators API, Avi Kivity, 2011/12/15
- [Qemu-devel] [PATCH 1/7] memory: introduce memory_region_set_enabled(), Avi Kivity, 2011/12/15
- Re: [Qemu-devel] [PULL v3 0/7] Memory API mutators, Anthony Liguori, 2011/12/19