xtensa_mpu_lookup

Description

This interface is implemented by the Xtensa core which is configured with an MPU. The primary use of this interface, is the iDMA device which will need to do various protection checks for the DMA transfers.

The mpu_region returns region data that hits for the specified address. If the address hits in a background mapping, the end address will be when a foreground mapping overrides the background mapping.

typedef struct xtensa_mpu_lookup {
        bool background;                 /* If false, a foreground hit */
        uint16 region;                   /* The foreground/background region */
        uint32 start;
        uint32 end;
        /* Permissions */
        bool sr;                             /* supervisor-read */
        bool sw;                             /* supervisor-write */
        bool sx;                             /* supervisor-execute */
        bool ur;                             /* user-read */
        bool uw;                             /* user-write */
        bool ux;                             /* user-execute */
} xtensa_mpu_lookup_t;

SIM_INTERFACE(xtensa_mpu_lookup) {
        xtensa_mpu_lookup_t (*mpu_region)(conf_object_t *obj, uint32 address);
};
#define XTENSA_MPU_LOOKUP_INTERFACE "xtensa_mpu_lookup"

Execution Context

Cell Context for all methods.