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mmu: Fix mapping_pos calculation

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In the MMU code mapping_pos is miscalculated when for example
SRAM_BASE_ADDRESS==0x40000000 and KERNEL_VM_SIZE==0xc0000000 getting a
mapping_pos of 0x0.

The problem is that we must cast the two values to uintptr_t before
casting the result to avoid the rollover to 0.

Signed-off-by: Carlo Caione <ccaione@baylibre.com>
This commit is contained in:
Carlo Caione 2020-10-23 16:59:32 +02:00 • committed by Anas Nashif
commit 47c592cd32
1 changed files with 2 additions and 2 deletions
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4
kernel/mmu.c
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@ -56,8 +56,8 @@ static struct k_spinlock mm_lock;
* beginning of system RAM.
*/
static uint8_t *mapping_pos =
(uint8_t *)((uintptr_t)(CONFIG_SRAM_BASE_ADDRESS +
CONFIG_KERNEL_VM_SIZE));
(uint8_t *)((uintptr_t)CONFIG_SRAM_BASE_ADDRESS +
(uintptr_t)CONFIG_KERNEL_VM_SIZE);
/* Lower-limit of virtual address mapping. Immediately below this is the
* permanent identity mapping for all SRAM.