[OpenBIOS] [PATCH 03/16] Change OFMEM to allocate memory from the top of RAM downwards.

[Mark Cave-Ayland]

From: mcayland <mcayland at f158a5a8-5612-0410-a976-696ce0be7e32>

At the moment OFMEM allocates memory from the bottom of RAM upwards, however many loaders/kernels initialise themselves in lower
memory areas which can cause them to be overwritten by subsequent memory allocations. Mimic the existing SPARC32 behaviour by
allocating physical and virtual memory from the top of RAM downwards.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland at siriusit.co.uk>

git-svn-id: svn://openbios.org/openbios/trunk@996 f158a5a8-5612-0410-a976-696ce0be7e32
---
 openbios-devel/libopenbios/ofmem_common.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/openbios-devel/libopenbios/ofmem_common.c b/openbios-devel/libopenbios/ofmem_common.c
index e93b938..34caa2f 100644
--- a/openbios-devel/libopenbios/ofmem_common.c
+++ b/openbios-devel/libopenbios/ofmem_common.c
@@ -511,7 +511,7 @@ phys_addr_t ofmem_claim_phys( phys_addr_t phys, ucell size, ucell align )
                 " align=" FMT_ucellx "\n",
                 phys, size, align);
 
-	return ofmem_claim_phys_( phys, size, align, 0, ofmem_arch_get_phys_top(), 0 );
+	return ofmem_claim_phys_( phys, size, align, 0, ofmem_arch_get_phys_top(), 1 );
 }
 
 static ucell ofmem_claim_virt_( ucell virt, ucell size, ucell align,
@@ -544,7 +544,7 @@ ucell ofmem_claim_virt( ucell virt, ucell size, ucell align )
 
 	/* printk("+ ofmem_claim virt %08lx %lx %ld\n", virt, size, align ); */
 	return ofmem_claim_virt_( virt, size, align,
-			get_ram_size(), ofmem_arch_get_virt_top(), 0 );
+			get_ram_size(), ofmem_arch_get_virt_top(), 1 );
 }
 
 /* if align != 0, phys is ignored. Returns -1 on error */
-- 
1.7.2.3