linux-kernel - [PATCH] staging: tidspbridge - configure full L1 MMU range

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Date:	Wed,  5 Jan 2011 00:20:10 -0600
From:	Fernando Guzman Lugo <fernando.lugo@...com>
To:	<omar.ramirez@...com>
Cc:	<gregkh@...e.de>, <rene.sapiens@...com>,
	<devel@...verdev.osuosl.org>, <linux-kernel@...r.kernel.org>,
	<linux-omap@...r.kernel.org>,
	Fernando Guzman Lugo <fernando.lugo@...com>,
	Felipe Contreras <felipe.contreras@...ia.com>
Subject: [PATCH] staging: tidspbridge - configure full L1 MMU range

Otherwise a virtual address beyond of the L1 size is used,
the MMU hardware will look into a memory that does not belong to
L1 translation tables. IOW; the MMU would allow to access any
memory, configured or not.

Reported-by: Felipe Contreras <felipe.contreras@...ia.com>
Signed-off-by: Fernando Guzman Lugo <fernando.lugo@...com>
Signed-off-by: Felipe Contreras <felipe.contreras@...ia.com>
---
 drivers/staging/tidspbridge/core/tiomap3430.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/tidspbridge/core/tiomap3430.c b/drivers/staging/tidspbridge/core/tiomap3430.c
index 1be081f..ec96d1e 100644
--- a/drivers/staging/tidspbridge/core/tiomap3430.c
+++ b/drivers/staging/tidspbridge/core/tiomap3430.c
@@ -70,6 +70,7 @@
 #define MMU_LARGE_PAGE_MASK      0xFFFF0000
 #define MMU_SMALL_PAGE_MASK      0xFFFFF000
 #define OMAP3_IVA2_BOOTADDR_MASK 0xFFFFFC00
+#define MMU_L1_SIZE              0x4000
 #define PAGES_II_LVL_TABLE   512
 #define PHYS_TO_PAGE(phys)      pfn_to_page((phys) >> PAGE_SHIFT)
 
@@ -786,10 +787,7 @@ static int bridge_dev_create(struct bridge_dev_context
 
 	pt_attrs = kzalloc(sizeof(struct pg_table_attrs), GFP_KERNEL);
 	if (pt_attrs != NULL) {
-		/* Assuming that we use only DSP's memory map
-		 * until 0x4000:0000 , we would need only 1024
-		 * L1 enties i.e L1 size = 4K */
-		pt_attrs->l1_size = 0x1000;
+		pt_attrs->l1_size = MMU_L1_SIZE;
 		align_size = pt_attrs->l1_size;
 		/* Align sizes are expected to be power of 2 */
 		/* we like to get aligned on L1 table size */
-- 
1.7.1

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