diff options
Diffstat (limited to 'drivers/media/video/samsung/mali/common/mali_mem_validation.c')
-rw-r--r-- | drivers/media/video/samsung/mali/common/mali_mem_validation.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/drivers/media/video/samsung/mali/common/mali_mem_validation.c b/drivers/media/video/samsung/mali/common/mali_mem_validation.c new file mode 100644 index 0000000..ea9c428 --- /dev/null +++ b/drivers/media/video/samsung/mali/common/mali_mem_validation.c @@ -0,0 +1,71 @@ +/* + * Copyright (C) 2011-2012 ARM Limited. All rights reserved. + * + * This program is free software and is provided to you under the terms of the GNU General Public License version 2 + * as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence. + * + * A copy of the licence is included with the program, and can also be obtained from Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +#include "mali_mem_validation.h" +#include "mali_osk.h" +#include "mali_kernel_common.h" + +#define MALI_INVALID_MEM_ADDR 0xFFFFFFFF + +typedef struct +{ + u32 phys_base; /**< Mali physical base of the memory, page aligned */ + u32 size; /**< size in bytes of the memory, multiple of page size */ +} _mali_mem_validation_t; + +static _mali_mem_validation_t mali_mem_validator = { MALI_INVALID_MEM_ADDR, MALI_INVALID_MEM_ADDR }; + +_mali_osk_errcode_t mali_mem_validation_add_range(const _mali_osk_resource_t *resource) +{ + /* Check that no other MEM_VALIDATION resources exist */ + if (MALI_INVALID_MEM_ADDR != mali_mem_validator.phys_base) + { + MALI_PRINT_ERROR(("Failed to add MEM_VALIDATION resource %s; another range is already specified\n", resource->description)); + return _MALI_OSK_ERR_FAULT; + } + + /* Check restrictions on page alignment */ + if ((0 != (resource->base & (~_MALI_OSK_CPU_PAGE_MASK))) || + (0 != (resource->size & (~_MALI_OSK_CPU_PAGE_MASK)))) + { + MALI_PRINT_ERROR(("Failed to add MEM_VALIDATION resource %s; incorrect alignment\n", resource->description)); + return _MALI_OSK_ERR_FAULT; + } + + mali_mem_validator.phys_base = resource->base; + mali_mem_validator.size = resource->size; + MALI_DEBUG_PRINT(2, ("Memory Validator '%s' installed for Mali physical address base=0x%08X, size=0x%08X\n", + resource->description, mali_mem_validator.phys_base, mali_mem_validator.size)); + + return _MALI_OSK_ERR_OK; +} + +_mali_osk_errcode_t mali_mem_validation_check(u32 phys_addr, u32 size) +{ + if (phys_addr < (phys_addr + size)) /* Don't allow overflow (or zero size) */ + { + if ((0 == ( phys_addr & (~_MALI_OSK_CPU_PAGE_MASK))) && + (0 == ( size & (~_MALI_OSK_CPU_PAGE_MASK)))) + { + if ((phys_addr >= mali_mem_validator.phys_base) && + ((phys_addr + (size - 1)) >= mali_mem_validator.phys_base) && + (phys_addr <= (mali_mem_validator.phys_base + (mali_mem_validator.size - 1))) && + ((phys_addr + (size - 1)) <= (mali_mem_validator.phys_base + (mali_mem_validator.size - 1))) ) + { + MALI_DEBUG_PRINT(3, ("Accepted range 0x%08X + size 0x%08X (= 0x%08X)\n", phys_addr, size, (phys_addr + size - 1))); + return _MALI_OSK_ERR_OK; + } + } + } + + MALI_PRINT_ERROR(("MALI PHYSICAL RANGE VALIDATION ERROR: The range supplied was: phys_base=0x%08X, size=0x%08X\n", phys_addr, size)); + + return _MALI_OSK_ERR_FAULT; +} |