[Xen-devel] [RFC][PATCH 13/13] hvmloader/e820: construct guest e820 table

[Tiejun Chen <tiejun.chen@xxxxxxxxx>]

Now we can use that memory map to build our final
e820 table but it may need to reorder all e820
entries.

Signed-off-by: Tiejun Chen <tiejun.chen@xxxxxxxxx>
---
 tools/firmware/hvmloader/e820.c | 40 +++++++++++++++++++++++++++++-----------
 1 file changed, 29 insertions(+), 11 deletions(-)

diff --git a/tools/firmware/hvmloader/e820.c b/tools/firmware/hvmloader/e820.c
index 2e05e93..3aa0be4 100644
--- a/tools/firmware/hvmloader/e820.c
+++ b/tools/firmware/hvmloader/e820.c
@@ -73,7 +73,8 @@ int build_e820_table(struct e820entry *e820,
                      unsigned int lowmem_reserved_base,
                      unsigned int bios_image_base)
 {
-    unsigned int nr = 0;
+    unsigned int nr = 0, i, j;
+    struct e820entry tmp;
 
     if ( !lowmem_reserved_base )
             lowmem_reserved_base = 0xA0000;
@@ -119,10 +120,6 @@ int build_e820_table(struct e820entry *e820,
 
     /* Low RAM goes here. Reserve space for special pages. */
     BUG_ON((hvm_info->low_mem_pgend << PAGE_SHIFT) < (2u << 20));
-    e820[nr].addr = 0x100000;
-    e820[nr].size = (hvm_info->low_mem_pgend << PAGE_SHIFT) - e820[nr].addr;
-    e820[nr].type = E820_RAM;
-    nr++;
 
     /*
      * Explicitly reserve space for special pages.
@@ -159,16 +156,37 @@ int build_e820_table(struct e820entry *e820,
         nr++;
     }
 
-
-    if ( hvm_info->high_mem_pgend )
+    /* Construct the remaings according memory_map[]. */
+    for ( i = 0; i < memory_map.nr_map; i++ )
     {
-        e820[nr].addr = ((uint64_t)1 << 32);
-        e820[nr].size =
-            ((uint64_t)hvm_info->high_mem_pgend << PAGE_SHIFT) - e820[nr].addr;
-        e820[nr].type = E820_RAM;
+        e820[nr].addr = memory_map.map[i].addr;
+        e820[nr].size = memory_map.map[i].size;
+        e820[nr].type = memory_map.map[i].type;
         nr++;
     }
 
+    /* May need to reorder all e820 entries. */
+    for ( j = 0; j < nr-1; j++ )
+    {
+        for ( i = j+1; i < nr; i++ )
+        {
+            if ( e820[j].addr > e820[i].addr )
+            {
+                tmp.addr = e820[j].addr;
+                tmp.size = e820[j].size;
+                tmp.type = e820[j].type;
+
+                e820[j].addr = e820[i].addr;
+                e820[j].size = e820[i].size;
+                e820[j].type = e820[i].type;
+
+                e820[i].addr = tmp.addr;
+                e820[i].size = tmp.size;
+                e820[i].type = tmp.type;
+            }
+        }
+    }
+
     return nr;
 }
 
-- 
1.9.1


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