minios: Disable the mfn_is_ram() check, it doesn't work correctly on all systems

This patch disables the mfn_is_ram check in mini-os. The current check
is insufficient and fails on some systems with larger than 4gb memory.

Signed-off-by: Matthew Fioravante <matthew.fioravante@jhuapl.edu>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyons.org>
Committed-by: Ian Campbell <ian.campbell@citrix.com>

1 files changed, 0 insertions, 13 deletions

diff --git a/extras/mini-os/arch/x86/ioremap.c b/extras/mini-os/arch/x86/ioremap.c
index c7f818609c..4384b1c0a4 100644
--- a/extras/mini-os/arch/x86/ioremap.c
+++ b/extras/mini-os/arch/x86/ioremap.c
@@ -35,7 +35,6 @@ static void *__do_ioremap(unsigned long phys_addr, unsigned long size,
     unsigned long va;
     unsigned long mfns, mfn;
     unsigned long num_pages, offset;
-    int i;
 
     /* allow non page aligned addresses but for mapping we need to align them */
     offset = (phys_addr & ~PAGE_MASK);
@@ -43,21 +42,9 @@ static void *__do_ioremap(unsigned long phys_addr, unsigned long size,
     phys_addr &= PAGE_MASK;
     mfns = mfn = phys_addr >> PAGE_SHIFT;
     
-    /* sanity checks on list of MFNs */
-    for ( i = 0; i < num_pages; i++, mfn++ )
-    {
-        if ( mfn_is_ram(mfn) )
-        {
-            printk("ioremap: mfn 0x%ulx is RAM\n", mfn);
-            goto mfn_invalid;
-        }
-    }   
     va = (unsigned long)map_frames_ex(&mfns, num_pages, 0, 1, 1,
                                       DOMID_IO, NULL, prot);
     return (void *)(va + offset);
-    
-mfn_invalid:
-    return NULL;
 }
 
 void *ioremap(unsigned long phys_addr, unsigned long size)