[Xen-devel] [PATCH v2 13/18] mini-os: add function to map one frame

[Juergen Gross <jgross@xxxxxxxx>]

Add a function to map one physical frame to a specified virtual
address as read/write. This will be used later multiple times.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 include/arm/arch_mm.h | 2 ++
 include/mm.h          | 1 +
 mm.c                  | 5 +++++
 3 files changed, 8 insertions(+)

diff --git a/include/arm/arch_mm.h b/include/arm/arch_mm.h
index 085d4e5..f4685d8 100644
--- a/include/arm/arch_mm.h
+++ b/include/arm/arch_mm.h
@@ -14,6 +14,8 @@ extern uint32_t physical_address_offset;      /* Add this to 
a virtual address to get
 
 #define L1_PAGETABLE_SHIFT      12
 
+#define L1_PROT          0
+
 #define to_phys(x)                 (((paddr_t)(x)+physical_address_offset) & 
0xffffffff)
 #define to_virt(x)                 ((void *)(((x)-physical_address_offset) & 
0xffffffff))
 
diff --git a/include/mm.h b/include/mm.h
index 9244e26..6add683 100644
--- a/include/mm.h
+++ b/include/mm.h
@@ -72,6 +72,7 @@ int do_map_frames(unsigned long addr,
         const unsigned long *f, unsigned long n, unsigned long stride,
        unsigned long increment, domid_t id, int *err, unsigned long prot);
 int unmap_frames(unsigned long va, unsigned long num_frames);
+int map_frame_rw(unsigned long addr, unsigned long mfn);
 #ifdef HAVE_LIBC
 extern unsigned long heap, brk, heap_mapped, heap_end;
 #endif
diff --git a/mm.c b/mm.c
index ff071ca..fd66115 100644
--- a/mm.c
+++ b/mm.c
@@ -319,6 +319,11 @@ int free_physical_pages(xen_pfn_t *mfns, int n)
     return HYPERVISOR_memory_op(XENMEM_decrease_reservation, &reservation);
 }
 
+int map_frame_rw(unsigned long addr, unsigned long mfn)
+{
+    return do_map_frames(addr, &mfn, 1, 1, 1, DOMID_SELF, NULL, L1_PROT);
+}
+
 #ifdef HAVE_LIBC
 void *sbrk(ptrdiff_t increment)
 {
-- 
2.6.6


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