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mainboard/storm: setup mmu in storm mainboard_init

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enable protection of zero page access, provide for uncached device memory range,
and protect against access outside of DRAM except to device registers.

BUG=chrome-os-partner:28467
TEST=verified mmu.pagetable.list output:

_______address___________|_physical________________|sec|_d_|_size____|_permissions____________________|_glb|_shr|_pageflags______________________|
     C:00000000--000FFFFF| | | | | | | | |
     C:00100000--3FFFFFFF| A:00:00100000--3FFFFFFF| ns| 00| 00100000| P:readwrite U:readwrite notexec| yes| no | strongly ordered |
     C:40000000--428FFFFF| A:00:40000000--428FFFFF| ns| 00| 00100000| P:readwrite U:readwrite exec | yes| no | write-back/no write alloc |
     C:42900000--43CFFFFF| A:00:42900000--43CFFFFF| ns| 00| 00100000| P:readwrite U:readwrite notexec| yes| no | strongly ordered |
     C:43D00000--5FFFFFFF| A:00:43D00000--5FFFFFFF| ns| 00| 00100000| P:readwrite U:readwrite exec | yes| no | write-back/no write alloc |

Change-Id: If9beb10938841aead5105d662f0aef741995d708
Signed-off-by: Deepa Dinamani <deepad@codeaurora.org>
Reviewed-on: https://chromium-review.googlesource.com/200341
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
Commit-Queue: Vadim Bendebury <vbendeb@chromium.org>
Tested-by: Vadim Bendebury <vbendeb@chromium.org>
This commit is contained in:
Deepa Dinamani 2014-05-15 17:14:12 -07:00 • committed by chrome-internal-fetch
commit 09dd137453
1 changed files with 34 additions and 1 deletions
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35
src/mainboard/google/storm/mainboard.c
View file

@ -17,12 +17,45 @@
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <arch/cache.h>
#include <boot/coreboot_tables.h>
#include <device/device.h>
#define TO_MB(x) ((x)>>20)
/* convenient shorthand (in MB) */
#define DRAM_START TO_MB(CONFIG_SYS_SDRAM_BASE)
#define DRAM_SIZE (CONFIG_DRAM_SIZE_MB)
#define DRAM_END (DRAM_START + DRAM_SIZE)
/* DMA memory for drivers */
#define DMA_START TO_MB(CONFIG_DRAM_DMA_START)
#define DMA_SIZE TO_MB(CONFIG_DRAM_DMA_SIZE)
static void setup_mmu(void)
{
dcache_mmu_disable();
/* Map Device memory. */
mmu_config_range(0, DRAM_START, DCACHE_OFF);
/* Disable Page 0 for trapping NULL pointer references. */
mmu_disable_range(0, 1);
/* Map DRAM memory */
mmu_config_range(DRAM_START, DRAM_SIZE, DCACHE_WRITEBACK);
/* Map DMA memory */
if (DMA_SIZE)
mmu_config_range(DMA_START, DMA_SIZE, DCACHE_OFF);
mmu_disable_range(DRAM_END, 4096 - DRAM_END);
mmu_init();
dcache_mmu_enable();
}
static void mainboard_init(device_t dev)
{
/* Not sure if this is needed at all */
setup_mmu();
}
static void mainboard_enable(device_t dev)