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kern: make GetTargetFirmware a compile-time constant when not building for Switch

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fincs 2020-08-10 21:42:19 +02:00 committed by SciresM
parent 3c85e37667
commit b917ea283e
4 changed files with 32 additions and 3 deletions
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6
libraries/libmesosphere/include/mesosphere/kern_common.hpp
View file

@ -22,6 +22,12 @@ namespace ams::kern {
constexpr size_t PageSize = 4_KB;
#ifdef ATMOSPHERE_BOARD_NINTENDO_NX
ams::TargetFirmware GetTargetFirmware();
#else
consteval ALWAYS_INLINE ams::TargetFirmware GetTargetFirmware() {
return ams::TargetFirmware_Current;
}
#endif
}

4
mesosphere/kernel/source/arch/arm64/init/start.s
View file

@ -61,12 +61,14 @@ __metadata_kernel_layout:
.error "Incorrect Mesosphere Metadata"
.endif
#ifdef ATMOSPHERE_BOARD_NINTENDO_NX
.global _ZN3ams4kern17GetTargetFirmwareEv
.type _ZN3ams4kern17GetTargetFirmwareEv, %function
_ZN3ams4kern17GetTargetFirmwareEv:
adr x0, __metadata_target_firmware
ldr w0, [x0]
ret
#endif
/* ams::kern::init::StartCore0(uintptr_t, uintptr_t) */
.section .crt0.text._ZN3ams4kern4init10StartCore0Emm, "ax", %progbits
@ -94,6 +96,7 @@ core0_el2:
core0_el1:
bl _ZN3ams4kern4init19DisableMmuAndCachesEv
#ifdef ATMOSPHERE_BOARD_NINTENDO_NX
/* Get the target firmware from exosphere. */
LOAD_IMMEDIATE_32(w0, 0xC3000004)
mov w1, #65000
@ -105,6 +108,7 @@ core0_el1:
/* Store the target firmware. */
adr x0, __metadata_target_firmware
str w1, [x0]
#endif
/* We want to invoke kernel loader. */
adr x0, _start

5
mesosphere/kernel_ldr/source/arch/arm64/start.s
View file

@ -56,6 +56,7 @@ _main:
stp x2, x30, [sp, #0x10]
stp xzr, xzr, [sp, #0x20]
#ifdef ATMOSPHERE_BOARD_NINTENDO_NX
/* Get the target firmware from exosphere. */
LOAD_IMMEDIATE_32(w0, 0xC3000004)
mov w1, #65000
@ -67,6 +68,7 @@ _main:
/* Store the target firmware. */
adr x0, __metadata_target_firmware
str w1, [x0]
#endif
/* Apply relocations and call init array for KernelLdr. */
adr x0, _start
@ -121,13 +123,14 @@ _main:
mov sp, x2
br x1
#ifdef ATMOSPHERE_BOARD_NINTENDO_NX
.global _ZN3ams4kern17GetTargetFirmwareEv
.type _ZN3ams4kern17GetTargetFirmwareEv, %function
_ZN3ams4kern17GetTargetFirmwareEv:
adr x0, __metadata_target_firmware
ldr w0, [x0]
ret
#endif
.balign 8
__external_references:

20
mesosphere/kernel_ldr/source/kern_init_loader.cpp
View file

@ -87,6 +87,22 @@ namespace ams::kern::init::loader {
cpu::InvalidateEntireTlb();
}
#ifdef ATMOSPHERE_BOARD_NINTENDO_NX
ALWAYS_INLINE bool ShouldPerformCpuSpecificSetup() {
/* Perform cpu-specific setup only on < 10.0.0. */
return kern::GetTargetFirmware() < ams::TargetFirmware_10_0_0;
}
#else
consteval ALWAYS_INLINE bool ShouldPerformCpuSpecificSetup() {
/* Always perform cpu-specific setup. */
return true;
}
#endif
void SetupInitialIdentityMapping(KInitialPageTable &ttbr1_table, uintptr_t base_address, uintptr_t kernel_size, uintptr_t page_table_region, size_t page_table_region_size, KInitialPageTable::IPageAllocator &allocator) {
/* Make a new page table for TTBR0_EL1. */
KInitialPageTable ttbr0_table(allocator.Allocate());
@ -116,8 +132,8 @@ namespace ams::kern::init::loader {
cpu::MemoryAccessIndirectionRegisterAccessor(MairValue).Store();
cpu::TranslationControlRegisterAccessor(TcrValue).Store();
/* Perform cpu-specific setup on < 10.0.0. */
if (kern::GetTargetFirmware() < ams::TargetFirmware_10_0_0) {
/* Perform cpu-specific setup if needed. */
if (ShouldPerformCpuSpecificSetup()) {
SavedRegisterState saved_registers;
SaveRegistersToTpidrEl1(&saved_registers);
ON_SCOPE_EXIT { VerifyAndClearTpidrEl1(&saved_registers); };