chore: update boot-protocol.md with new MSR_MTRRdefType

Add MSR_MTRRdefType to the list

Signed-off-by: Egor Lazarchuk <[email protected]>

Author: ShadowCurse

docs/cpu_templates/boot-protocol.md

@@ -10,19 +10,18 @@ See also: [CPUID normalization](cpuid-normalization.md)
 
 ## Boot protocol MSRs (x86_64 only)
 
-On x86_64, the following MSRs are set to `0`:
-
-- MSR_IA32_SYSENTER_CS
-- MSR_IA32_SYSENTER_ESP
-- MSR_IA32_SYSENTER_EIP
-- MSR_STAR
-- MSR_CSTAR
-- MSR_KERNEL_GS_BASE
-- MSR_SYSCALL_MASK
-- MSR_LSTAR
-- MSR_IA32_TSC
-
-and MSR_IA32_MISC_ENABLE is set to `1`.
+On x86_64, the following MSRs are set before boot:
+- MSR_IA32_SYSENTER_CS: 0x0
+- MSR_IA32_SYSENTER_ESP: 0x0
+- MSR_IA32_SYSENTER_EIP: 0x0
+- MSR_STAR: 0x0
+- MSR_CSTAR: 0x0
+- MSR_KERNEL_GS_BASE: 0x0
+- MSR_SYSCALL_MASK: 0x0
+- MSR_LSTAR: 0x0
+- MSR_IA32_TSC: 0x0
+- MSR_IA32_MISC_ENABLE: 0x1
+- MSR_MTRRdefType: 0x806 (enable MTRR and set default memory type to `write-back` (value 6))
 
 ## Boot protocol ARM registers (aarch64 only)