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arch: arm: API to allow Non-Secure FPU Access

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This commit introduces and implements an internal ARM
TrustZone-M API to allow the Non-Secure firmware to use
the Floating Point Unit (FPU).

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
This commit is contained in:
Ioannis Glaropoulos 2018-10-23 16:51:15 +02:00 • committed by Anas Nashif
commit dbbed1d1db
2 changed files with 25 additions and 0 deletions
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8
arch/arm/core/cortex_m/tz/arm_core_tz.c
View file

@ -108,6 +108,14 @@ void tz_nonsecure_system_reset_req_block(int block)
| aircr_payload;
}
#if defined(CONFIG_ARMV7_M_ARMV8_M_FP)
void tz_nonsecure_fpu_access_enable(void)
{
SCB->NSACR |=
(1UL << SCB_NSACR_CP10_Pos) | (1UL << SCB_NSACR_CP11_Pos);
}
#endif /* CONFIG_ARMV7_M_ARMV8_M_FP */
void tz_sau_configure(int enable, int allns)
{
if (enable) {

17
arch/arm/include/cortex_m/tz.h
View file

@ -167,6 +167,23 @@ void tz_nonsecure_exception_prio_config(int secure_boost);
*/
void tz_nbanked_exception_target_state_set(int secure_state);
#if defined(CONFIG_ARMV7_M_ARMV8_M_FP)
/**
* @brief Allow Non-Secure firmware to access the FPU
*
* Function allows the Non-Secure firmware to access the Floating Point Unit.
*
* Relevant for ARMv8-M MCUs supporting the Floating Point Extension.
*
* Note:
*
* This function shall only be called from Secure state.
*
* @return N/A
*/
void tz_nonsecure_fpu_access_enable(void);
#endif /* CONFIG_ARMV7_M_ARMV8_M_FP */
/**
*
* @brief Configure SAU