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A new function, mmu_gva_to_gpa(), will be the sole entry point for resolving guest virtual addresses. This initial implementation models the processor's state on reset. The function inspects the M bit from the emulated SCTLR_EL1 register. If the bit is clear, address mapping (GVA = GPA) is performed. This is an architecturally-mandated behavior required for the Arm guest to execute its initiall boot code before enabling virtual memory. Signed-off-by: Ronald Caesar <github43132@proton.me>
16 lines
344 B
C++
16 lines
344 B
C++
#include "mmu.h"
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namespace pound::arm64::memory
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{
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int mmu_gva_to_gpa(pound::arm64::vcpu_state_t* vcpu, uint64_t gva, uint64_t* out_gpa)
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{
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const uint8_t SCTLR_EL1_M_BIT = (1 << 0);
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if (0 == (vcpu->sctlr_el1 & SCTLR_EL1_M_BIT))
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{
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*out_gpa = gva;
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return 0;
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}
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return -1;
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}
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} // namespace pound::arm64::memory
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