Translation Table Base Registers (TTBR0/TTBR1)

TTBRn holds the base address of translation table n, and information about the memory it occupies. More...

Functions
__STATIC_FORCEINLINE uint32_t	__get_TTBR0 (void)
	Get TTBR0.
__STATIC_FORCEINLINE void	__set_TTBR0 (uint32_t ttbr0)
	Set TTBR0.

Description

TTBRn holds the base address of translation table n, and information about the memory it occupies.

32-bit TTBR format

Bits	Name	Function
[31:x]	BADDR	Translation table base address, bits[31:x].
[x-1:7]	-	Reserved.
[6]	IRGN[0]	Inner region bit 0.
[5]	NOS	Not Outer Shareable bit.
[4:3]	RGN	Region bits.
[2]	-	Reserved.
[1]	S	Shareable bit.
[0]	C/IRGN[1]	Cacheable bit. / Inner region bit 1.

Note

The width of TTBR0 BADDR field depends on the setting in TTBCR N field, giving x=14-N.

The width of TTBR1 BADDR field is fixed at x=14.

64-bit TTBR format

Bits	Name	Function
[63:56]	-	Reserved.
[55:48]	ASID	An ASID for the translation table base address.
[47:40]	-	Reserved.
[39:x]	BADDR	Translation table base address, bits[39:x].
[x-1:0]	-	Reserved.

Note

The width of TBBR0/TBBR1 BADDR fields depends on the settings in TTBCR T0SZ/T1SZ fields respectively, giving x=14-TnSZ.

Consider using __get_TTBR0 and __set_TTBR0 for accessing TTBR0 register.

Function Documentation

__get_TTBR0()

__STATIC_INLINE uint32_t __get_TTBR0

(

void

)

Get TTBR0.

This function returns the value of the Translation Table Base Register 0.

Returns

Translation Table Base Register 0 value

This function returns the value of the Translation Table Base Register 0.

__set_TTBR0()

__STATIC_INLINE void __set_TTBR0

(

uint32_t

ttbr0

)

Set TTBR0.

This function assigns the given value to the Translation Table Base Register 0.

Parameters

[in]

ttbr0

Translation Table Base Register 0 value to set

This function assigns the given value to the Translation Table Base Register 0.