[Xen-devel] [PATCH RFC 25/35] arm: acpi add helper functions to map memory regions

[parth.dixit@xxxxxxxxxx]

From: Parth Dixit <parth.dixit@xxxxxxxxxx>

For passing ACPI tables to dom0, UEFI memory needs to be mapped
by xen in dom0 address space. This patch adds helper functions for mapping.

Signed-off-by: Parth Dixit <parth.dixit@xxxxxxxxxx>
---
 xen/arch/arm/p2m.c        | 24 ++++++++++++++++++++++++
 xen/include/asm-arm/p2m.h | 10 ++++++++++
 2 files changed, 34 insertions(+)

diff --git a/xen/arch/arm/p2m.c b/xen/arch/arm/p2m.c
index 8809f5a..5593a91 100644
--- a/xen/arch/arm/p2m.c
+++ b/xen/arch/arm/p2m.c
@@ -943,6 +943,30 @@ int p2m_populate_ram(struct domain *d,
                              0, MATTR_MEM, p2m_ram_rw);
 }
 
+int map_ram_regions(struct domain *d,
+                     unsigned long start_gfn,
+                     unsigned long nr,
+                     unsigned long mfn)
+{
+    return apply_p2m_changes(d, INSERT,
+                             pfn_to_paddr(start_gfn),
+                             pfn_to_paddr(start_gfn + nr),
+                             pfn_to_paddr(mfn),
+                             MATTR_MEM, p2m_mmio_direct);
+}
+
+int unmap_ram_regions(struct domain *d,
+                       unsigned long start_gfn,
+                       unsigned long nr,
+                       unsigned long mfn)
+{
+    return apply_p2m_changes(d, REMOVE,
+                             pfn_to_paddr(start_gfn),
+                             pfn_to_paddr(start_gfn + nr),
+                             pfn_to_paddr(mfn),
+                             MATTR_MEM, p2m_invalid);
+}
+
 int map_mmio_regions(struct domain *d,
                      unsigned long start_gfn,
                      unsigned long nr,
diff --git a/xen/include/asm-arm/p2m.h b/xen/include/asm-arm/p2m.h
index da36504..be76ecd 100644
--- a/xen/include/asm-arm/p2m.h
+++ b/xen/include/asm-arm/p2m.h
@@ -132,6 +132,16 @@ int guest_physmap_add_entry(struct domain *d,
                             unsigned long page_order,
                             p2m_type_t t);
 
+int map_ram_regions(struct domain *d,
+                    unsigned long start_gfn,
+                    unsigned long nr_mfns,
+                    unsigned long mfn);
+
+int unmap_ram_regions(struct domain *d,
+                    unsigned long start_gfn,
+                    unsigned long nr_mfns,
+                    unsigned long mfn);
+
 /* Untyped version for RAM only, for compatibility */
 static inline int guest_physmap_add_page(struct domain *d,
                                          unsigned long gfn,
-- 
1.9.1


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