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hw: don't depend on ARMv8 HCR, CPTR EL2 reg values

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Instead of re-using the register values found in HCR_EL2 and CPTR_EL2
and setting single bits within them, define the complete content to
prevent inconsistent hardware/hypervisor state.

Ref genodelabs/genode#4759
This commit is contained in:
Stefan Kalkowski 2023-02-10 11:15:47 +01:00 committed by Christian Helmuth
parent c5b9cabd89
commit 80453236c4
1 changed files with 2 additions and 2 deletions
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4
repos/base-hw/src/bootstrap/spec/arm_64/cortex_a53_mmu.cc
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@ -64,7 +64,7 @@ static inline void prepare_hypervisor(Cpu::Ttbr::access_t const ttbr,
using namespace Hw::Mm;
/* forbid trace access */
Cpu::Cptr_el2::access_t cptr = Cpu::Cptr_el2::read();
Cpu::Cptr_el2::access_t cptr = 0;
Cpu::Cptr_el2::Tta::set(cptr, 1);
Cpu::Cptr_el2::write(cptr);
@ -74,7 +74,7 @@ static inline void prepare_hypervisor(Cpu::Ttbr::access_t const ttbr,
/* forbid any 32bit access to coprocessor/sysregs */
Cpu::Hstr_el2::write(0xffff);
Cpu::Hcr_el2::access_t hcr = Cpu::Hcr_el2::read();
Cpu::Hcr_el2::access_t hcr = 0;
Cpu::Hcr_el2::Rw::set(hcr, 1); /* exec in aarch64 */
Cpu::Hcr_el2::write(hcr);