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| author | Pavel Pisa <pisa@cmp.felk.cvut.cz> | 2016-07-01 00:05:33 +0200 |
|---|---|---|
| committer | Pavel Pisa <pisa@cmp.felk.cvut.cz> | 2016-10-02 10:40:33 +0200 |
| commit | d5ff46bd52864bac62c49dda81d56afd6358a054 (patch) | |
| tree | 0f8c6accdbfb5ff142fb7c5d5090d8dfdc641798 /c/src/lib/libcpu/arm/shared/include/arm-cp15.h | |
| parent | arm/raspberrypi: ensure that RTEMS application image can be started by U-boot. (diff) | |
| download | rtems-d5ff46bd52864bac62c49dda81d56afd6358a054.tar.bz2 | |
arm/score and shared: define ARM hypervisor mode and alternate vector table base access.
The main reason for inclusion of minimum hypervisor related defines
is that current ARM boards firmware and loaders (U-boot for example)
start loaded operating system kernel in HYP mode to allow it take
control of virtualization (Linux/KVM for example).
Updates #2783
Diffstat (limited to '')
| -rw-r--r-- | c/src/lib/libcpu/arm/shared/include/arm-cp15.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/c/src/lib/libcpu/arm/shared/include/arm-cp15.h b/c/src/lib/libcpu/arm/shared/include/arm-cp15.h index 4c1966d7ff..8357656bd8 100644 --- a/c/src/lib/libcpu/arm/shared/include/arm-cp15.h +++ b/c/src/lib/libcpu/arm/shared/include/arm-cp15.h @@ -1324,6 +1324,36 @@ arm_cp15_set_vector_base_address(void *base) ); } +ARM_CP15_TEXT_SECTION static inline void +*arm_cp15_get_hyp_vector_base_address(void) +{ + ARM_SWITCH_REGISTERS; + void *base; + + __asm__ volatile ( + ARM_SWITCH_TO_ARM + "mrc p15, 4, %[base], c12, c0, 0\n" + ARM_SWITCH_BACK + : [base] "=&r" (base) ARM_SWITCH_ADDITIONAL_OUTPUT + ); + + return base; +} + +ARM_CP15_TEXT_SECTION static inline void +arm_cp15_set_hyp_vector_base_address(void *base) +{ + ARM_SWITCH_REGISTERS; + + __asm__ volatile ( + ARM_SWITCH_TO_ARM + "mcr p15, 4, %[base], c12, c0, 0\n" + ARM_SWITCH_BACK + : ARM_SWITCH_OUTPUT + : [base] "r" (base) + ); +} + /** * @brief Sets the @a section_flags for the address range [@a begin, @a end). * |