mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-10 14:11:43 +00:00
454 lines
15 KiB
ArmAsm
454 lines
15 KiB
ArmAsm
/*
|
|
* Copyright (c) 2018-2020 Atmosphère-NX
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
/* For some reason GAS doesn't know about it, even with .cpu cortex-a57 */
|
|
#define cpuactlr_el1 s3_1_c15_c2_0
|
|
#define cpuectlr_el1 s3_1_c15_c2_1
|
|
|
|
#define LOAD_IMMEDIATE_32(reg, val) \
|
|
mov reg, #(((val) >> 0x00) & 0xFFFF); \
|
|
movk reg, #(((val) >> 0x10) & 0xFFFF), lsl#16
|
|
|
|
#define LOAD_IMMEDIATE_64(reg, val) \
|
|
mov reg, #(((val) >> 0x00) & 0xFFFF); \
|
|
movk reg, #(((val) >> 0x10) & 0xFFFF), lsl#16; \
|
|
movk reg, #(((val) >> 0x20) & 0xFFFF), lsl#32; \
|
|
movk reg, #(((val) >> 0x30) & 0xFFFF), lsl#48
|
|
|
|
#define LOAD_FROM_LABEL(reg, label) \
|
|
adr reg, label; \
|
|
ldr reg, [reg]
|
|
|
|
.section .crt0.text.start, "ax", %progbits
|
|
.global _start
|
|
_start:
|
|
b _ZN3ams4kern4init10StartCore0Emm
|
|
__metadata_begin:
|
|
.ascii "MSS0" /* Magic */
|
|
__metadata_ini_offset:
|
|
.quad 0 /* INI1 base address. */
|
|
__metadata_kernelldr_offset:
|
|
.quad 0 /* Kernel Loader base address. */
|
|
__metadata_kernel_layout:
|
|
.word _start - _start /* rx_offset */
|
|
.word __rodata_start - _start /* rx_end_offset */
|
|
.word __rodata_start - _start /* ro_offset */
|
|
.word __data_start - _start /* ro_end_offset */
|
|
.word __data_start - _start /* rw_offset */
|
|
.word __bss_start__ - _start /* rw_end_offset */
|
|
.word __bss_start__ - _start /* bss_offset */
|
|
.word __bss_end__ - _start /* bss_end_offset */
|
|
.word __end__ - _start /* ini_load_offset */
|
|
.word _DYNAMIC - _start /* dynamic_offset */
|
|
.word __init_array_start - _start /* init_array_offset */
|
|
.word __init_array_end - _start /* init_array_end_offset */
|
|
.if (. - __metadata_begin) != 0x44
|
|
.error "Incorrect Mesosphere Metadata"
|
|
.endif
|
|
|
|
/* ams::kern::init::StartCore0(uintptr_t, uintptr_t) */
|
|
.section .crt0.text._ZN3ams4kern4init10StartCore0Emm, "ax", %progbits
|
|
.global _ZN3ams4kern4init10StartCore0Emm
|
|
.type _ZN3ams4kern4init10StartCore0Emm, %function
|
|
_ZN3ams4kern4init10StartCore0Emm:
|
|
/* Mask all interrupts. */
|
|
msr daifset, #0xF
|
|
|
|
/* Save arguments for later use. */
|
|
mov x19, x0
|
|
mov x20, x1
|
|
|
|
/* Check our current EL. We want to be executing out of EL1. */
|
|
/* If we're in EL2, we'll need to deprivilege ourselves. */
|
|
mrs x1, currentel
|
|
cmp x1, #0x4
|
|
b.eq core0_el1
|
|
cmp x1, #0x8
|
|
b.eq core0_el2
|
|
core0_el3:
|
|
b core0_el3
|
|
core0_el2:
|
|
bl _ZN3ams4kern4init16JumpFromEL2ToEL1Ev
|
|
core0_el1:
|
|
bl _ZN3ams4kern4init19DisableMmuAndCachesEv
|
|
|
|
/* We want to invoke kernel loader. */
|
|
adr x0, _start
|
|
adr x1, __metadata_kernel_layout
|
|
LOAD_FROM_LABEL(x2, __metadata_ini_offset)
|
|
add x2, x0, x2
|
|
LOAD_FROM_LABEL(x3, __metadata_kernelldr_offset)
|
|
add x3, x0, x3
|
|
blr x3
|
|
|
|
/* At this point kernelldr has been invoked, and we are relocated at a random virtual address. */
|
|
/* Next thing to do is to set up our memory management and slabheaps -- all the other core initialization. */
|
|
/* Call ams::kern::init::InitializeCore(uintptr_t, uintptr_t) */
|
|
mov x1, x0 /* Kernelldr returns a KInitialPageAllocator state for the kernel to re-use. */
|
|
mov x0, xzr /* Official kernel always passes zero, when this is non-zero the address is mapped. */
|
|
bl _ZN3ams4kern4init14InitializeCoreEmm
|
|
|
|
/* Get the init arguments for core 0. */
|
|
mov x0, xzr
|
|
bl _ZN3ams4kern4init23GetInitArgumentsAddressEi
|
|
|
|
bl _ZN3ams4kern4init16InvokeEntrypointEPKNS1_14KInitArgumentsE
|
|
|
|
/* ams::kern::init::StartOtherCore(const ams::kern::init::KInitArguments *) */
|
|
.section .crt0.text._ZN3ams4kern4init14StartOtherCoreEPKNS1_14KInitArgumentsE, "ax", %progbits
|
|
.global _ZN3ams4kern4init14StartOtherCoreEPKNS1_14KInitArgumentsE
|
|
.type _ZN3ams4kern4init14StartOtherCoreEPKNS1_14KInitArgumentsE, %function
|
|
_ZN3ams4kern4init14StartOtherCoreEPKNS1_14KInitArgumentsE:
|
|
/* Preserve the KInitArguments pointer in a register. */
|
|
mov x20, x0
|
|
|
|
/* Check our current EL. We want to be executing out of EL1. */
|
|
/* If we're in EL2, we'll need to deprivilege ourselves. */
|
|
mrs x1, currentel
|
|
cmp x1, #0x4
|
|
b.eq othercore_el1
|
|
cmp x1, #0x8
|
|
b.eq othercore_el2
|
|
othercore_el3:
|
|
b othercore_el3
|
|
othercore_el2:
|
|
bl _ZN3ams4kern4init16JumpFromEL2ToEL1Ev
|
|
othercore_el1:
|
|
bl _ZN3ams4kern4init19DisableMmuAndCachesEv
|
|
|
|
/* Setup system registers using values from our KInitArguments. */
|
|
ldr x1, [x20, #0x00]
|
|
msr ttbr0_el1, x1
|
|
ldr x1, [x20, #0x08]
|
|
msr ttbr1_el1, x1
|
|
ldr x1, [x20, #0x10]
|
|
msr tcr_el1, x1
|
|
ldr x1, [x20, #0x18]
|
|
msr mair_el1, x1
|
|
|
|
/* Perform cpu-specific setup. */
|
|
mrs x1, midr_el1
|
|
ubfx x2, x1, #0x18, #0x8 /* Extract implementer bits. */
|
|
cmp x2, #0x41 /* Implementer::ArmLimited */
|
|
b.ne othercore_cpu_specific_setup_end
|
|
ubfx x2, x1, #0x4, #0xC /* Extract primary part number. */
|
|
cmp x2, #0xD07 /* PrimaryPartNumber::CortexA57 */
|
|
b.eq othercore_cpu_specific_setup_cortex_a57
|
|
cmp x2, #0xD03 /* PrimaryPartNumber::CortexA53 */
|
|
b.eq othercore_cpu_specific_setup_cortex_a53
|
|
b othercore_cpu_specific_setup_end
|
|
othercore_cpu_specific_setup_cortex_a57:
|
|
othercore_cpu_specific_setup_cortex_a53:
|
|
ldr x1, [x20, #0x20]
|
|
msr cpuactlr_el1, x1
|
|
ldr x1, [x20, #0x28]
|
|
msr cpuectlr_el1, x1
|
|
|
|
othercore_cpu_specific_setup_end:
|
|
/* Ensure instruction consistency. */
|
|
dsb sy
|
|
isb
|
|
|
|
/* Set sctlr_el1 and ensure instruction consistency. */
|
|
ldr x1, [x20, #0x30]
|
|
msr sctlr_el1, x1
|
|
|
|
dsb sy
|
|
isb
|
|
|
|
/* Jump to the virtual address equivalent to ams::kern::init::InvokeEntrypoint */
|
|
ldr x1, [x20, #0x50]
|
|
adr x2, _ZN3ams4kern4init14StartOtherCoreEPKNS1_14KInitArgumentsE
|
|
sub x1, x1, x2
|
|
adr x2, _ZN3ams4kern4init16InvokeEntrypointEPKNS1_14KInitArgumentsE
|
|
add x1, x1, x2
|
|
mov x0, x20
|
|
br x1
|
|
|
|
/* ams::kern::init::InvokeEntrypoint(const ams::kern::init::KInitArguments *) */
|
|
.section .crt0.text._ZN3ams4kern4init16InvokeEntrypointEPKNS1_14KInitArgumentsE, "ax", %progbits
|
|
.global _ZN3ams4kern4init16InvokeEntrypointEPKNS1_14KInitArgumentsE
|
|
.type _ZN3ams4kern4init16InvokeEntrypointEPKNS1_14KInitArgumentsE, %function
|
|
_ZN3ams4kern4init16InvokeEntrypointEPKNS1_14KInitArgumentsE:
|
|
/* Preserve the KInitArguments pointer in a register. */
|
|
mov x20, x0
|
|
|
|
/* Clear CPACR_EL1. This will prevent classes of traps (SVE, etc). */
|
|
msr cpacr_el1, xzr
|
|
isb
|
|
|
|
/* Setup the stack pointer. */
|
|
ldr x1, [x20, #0x38]
|
|
mov sp, x1
|
|
|
|
/* Ensure that system debug registers are setup. */
|
|
bl _ZN3ams4kern4init24InitializeDebugRegistersEv
|
|
|
|
/* Ensure that the exception vectors are setup. */
|
|
bl _ZN3ams4kern4init26InitializeExceptionVectorsEv
|
|
|
|
/* Jump to the entrypoint. */
|
|
ldr x1, [x20, #0x40]
|
|
ldr x0, [x20, #0x48]
|
|
br x1
|
|
|
|
|
|
/* ams::kern::init::JumpFromEL2ToEL1() */
|
|
.section .crt0.text._ZN3ams4kern4init16JumpFromEL2ToEL1Ev, "ax", %progbits
|
|
.global _ZN3ams4kern4init16JumpFromEL2ToEL1Ev
|
|
.type _ZN3ams4kern4init16JumpFromEL2ToEL1Ev, %function
|
|
_ZN3ams4kern4init16JumpFromEL2ToEL1Ev:
|
|
/* We're going to want to ERET to our caller. */
|
|
msr elr_el2, x30
|
|
|
|
/* Flush the entire data cache and invalidate the entire TLB. */
|
|
bl _ZN3ams4kern4arch5arm643cpu32FlushEntireDataCacheWithoutStackEv
|
|
|
|
/* Setup system registers for deprivileging. */
|
|
/* ACTLR_EL2: */
|
|
/* - CPUACTLR access control = 1 */
|
|
/* - CPUECTLR access control = 1 */
|
|
/* - L2CTLR access control = 1 */
|
|
/* - L2ECTLR access control = 1 */
|
|
/* - L2ACTLR access control = 1 */
|
|
mov x0, #0x73
|
|
msr actlr_el2, x0
|
|
|
|
/* HCR_EL2: */
|
|
/* - RW = 1 (el1 is aarch64) */
|
|
mov x0, #0x80000000
|
|
msr hcr_el2, x0
|
|
|
|
/* SCTLR_EL1: */
|
|
/* - EOS = 1 */
|
|
/* - EIS = 1 */
|
|
/* - SPAN = 1 */
|
|
LOAD_IMMEDIATE_32(x0, 0x00C00800)
|
|
msr sctlr_el1, x0
|
|
|
|
/* DACR32_EL2: */
|
|
/* - Manager access for all D<n> */
|
|
mov x0, #0xFFFFFFFF
|
|
msr dacr32_el2, x0
|
|
|
|
/* SPSR_EL2: */
|
|
/* - EL1h */
|
|
/* - IRQ masked */
|
|
/* - FIQ masked */
|
|
mov x0, #0xC5
|
|
msr spsr_el2, x0
|
|
|
|
eret
|
|
|
|
/* ams::kern::init::DisableMmuAndCaches() */
|
|
.section .crt0.text._ZN3ams4kern4init19DisableMmuAndCachesEv, "ax", %progbits
|
|
.global _ZN3ams4kern4init19DisableMmuAndCachesEv
|
|
.type _ZN3ams4kern4init19DisableMmuAndCachesEv, %function
|
|
_ZN3ams4kern4init19DisableMmuAndCachesEv:
|
|
/* The stack isn't set up, so we'll need to trash a register. */
|
|
mov x22, x30
|
|
|
|
/* Flush the entire data cache and invalidate the entire TLB. */
|
|
bl _ZN3ams4kern4arch5arm643cpu32FlushEntireDataCacheWithoutStackEv
|
|
|
|
/* Invalidate the instruction cache, and ensure instruction consistency. */
|
|
ic ialluis
|
|
dsb sy
|
|
isb
|
|
|
|
/* Set SCTLR_EL1 to disable the caches and mmu. */
|
|
/* SCTLR_EL1: */
|
|
/* - M = 0 */
|
|
/* - C = 0 */
|
|
/* - I = 0 */
|
|
mrs x0, sctlr_el1
|
|
LOAD_IMMEDIATE_64(x1, ~0x1005)
|
|
and x0, x0, x1
|
|
msr sctlr_el1, x0
|
|
|
|
mov x30, x22
|
|
ret
|
|
|
|
/* ams::kern::arch::arm64::cpu::FlushEntireDataCacheWithoutStack() */
|
|
.section .crt0.text._ZN3ams4kern4arch5arm643cpu32FlushEntireDataCacheWithoutStackEv, "ax", %progbits
|
|
.global _ZN3ams4kern4arch5arm643cpu32FlushEntireDataCacheWithoutStackEv
|
|
.type _ZN3ams4kern4arch5arm643cpu32FlushEntireDataCacheWithoutStackEv, %function
|
|
_ZN3ams4kern4arch5arm643cpu32FlushEntireDataCacheWithoutStackEv:
|
|
/* The stack isn't set up, so we'll need to trash a register. */
|
|
mov x23, x30
|
|
|
|
/* Ensure that the cache is coherent. */
|
|
bl _ZN3ams4kern4arch5arm643cpu37FlushEntireDataCacheLocalWithoutStackEv
|
|
dsb sy
|
|
|
|
bl _ZN3ams4kern4arch5arm643cpu38FlushEntireDataCacheSharedWithoutStackEv
|
|
dsb sy
|
|
|
|
bl _ZN3ams4kern4arch5arm643cpu37FlushEntireDataCacheLocalWithoutStackEv
|
|
dsb sy
|
|
|
|
/* Invalidate the entire TLB, and ensure instruction consistency. */
|
|
tlbi vmalle1is
|
|
dsb sy
|
|
isb
|
|
|
|
mov x30, x23
|
|
ret
|
|
|
|
/* ams::kern::arch::arm64::cpu::FlushEntireDataCacheLocalWithoutStack() */
|
|
.section .crt0.text._ZN3ams4kern4arch5arm643cpu37FlushEntireDataCacheLocalWithoutStackEv, "ax", %progbits
|
|
.global _ZN3ams4kern4arch5arm643cpu37FlushEntireDataCacheLocalWithoutStackEv
|
|
.type _ZN3ams4kern4arch5arm643cpu37FlushEntireDataCacheLocalWithoutStackEv, %function
|
|
_ZN3ams4kern4arch5arm643cpu37FlushEntireDataCacheLocalWithoutStackEv:
|
|
/* The stack isn't set up, so we'll need to trash a register. */
|
|
mov x24, x30
|
|
|
|
/* CacheLineIdAccessor clidr_el1; */
|
|
mrs x10, clidr_el1
|
|
/* const int levels_of_unification = clidr_el1.GetLevelsOfUnification(); */
|
|
ubfx x10, x10, #0x15, 3
|
|
|
|
/* int level = levels_of_unification - 1 */
|
|
sub w9, w10, #1
|
|
|
|
/* while (level >= 0) { */
|
|
begin_flush_cache_local_loop:
|
|
cmn w9, #1
|
|
b.eq done_flush_cache_local_loop
|
|
|
|
/* FlushEntireDataCacheImplWithoutStack(level); */
|
|
mov w0, w9
|
|
bl _ZN3ams4kern4arch5arm643cpu36FlushEntireDataCacheImplWithoutStackEv
|
|
|
|
/* level--; */
|
|
sub w9, w9, #1
|
|
|
|
/* } */
|
|
b begin_flush_cache_local_loop
|
|
|
|
done_flush_cache_local_loop:
|
|
mov x30, x24
|
|
ret
|
|
|
|
/* ams::kern::arch::arm64::cpu::FlushEntireDataCacheSharedWithoutStack() */
|
|
.section .crt0.text._ZN3ams4kern4arch5arm643cpu38FlushEntireDataCacheSharedWithoutStackEv, "ax", %progbits
|
|
.global _ZN3ams4kern4arch5arm643cpu38FlushEntireDataCacheSharedWithoutStackEv
|
|
.type _ZN3ams4kern4arch5arm643cpu38FlushEntireDataCacheSharedWithoutStackEv, %function
|
|
_ZN3ams4kern4arch5arm643cpu38FlushEntireDataCacheSharedWithoutStackEv:
|
|
/* The stack isn't set up, so we'll need to trash a register. */
|
|
mov x24, x30
|
|
|
|
/* CacheLineIdAccessor clidr_el1; */
|
|
mrs x10, clidr_el1
|
|
/* const int levels_of_coherency = clidr_el1.GetLevelsOfCoherency(); */
|
|
ubfx x9, x10, #0x18, 3
|
|
/* const int levels_of_unification = clidr_el1.GetLevelsOfUnification(); */
|
|
ubfx x10, x10, #0x15, 3
|
|
|
|
/* int level = levels_of_coherency */
|
|
|
|
/* while (level >= levels_of_unification) { */
|
|
begin_flush_cache_shared_loop:
|
|
cmp w10, w9
|
|
b.gt done_flush_cache_shared_loop
|
|
|
|
/* FlushEntireDataCacheImplWithoutStack(level); */
|
|
mov w0, w9
|
|
bl _ZN3ams4kern4arch5arm643cpu36FlushEntireDataCacheImplWithoutStackEv
|
|
|
|
/* level--; */
|
|
sub w9, w9, #1
|
|
|
|
/* } */
|
|
b begin_flush_cache_shared_loop
|
|
|
|
done_flush_cache_shared_loop:
|
|
mov x30, x24
|
|
ret
|
|
|
|
/* ams::kern::arch::arm64::cpu::FlushEntireDataCacheImplWithoutStack() */
|
|
.section .crt0.text._ZN3ams4kern4arch5arm643cpu36FlushEntireDataCacheImplWithoutStackEv, "ax", %progbits
|
|
.global _ZN3ams4kern4arch5arm643cpu36FlushEntireDataCacheImplWithoutStackEv
|
|
.type _ZN3ams4kern4arch5arm643cpu36FlushEntireDataCacheImplWithoutStackEv, %function
|
|
_ZN3ams4kern4arch5arm643cpu36FlushEntireDataCacheImplWithoutStackEv:
|
|
/* const u64 level_sel_value = static_cast<u64>(level << 1); */
|
|
lsl w6, w0, #1
|
|
sxtw x6, w6
|
|
|
|
/* cpu::SetCsselrEl1(level_sel_value); */
|
|
msr csselr_el1, x6
|
|
|
|
/* cpu::InstructionMemoryBarrier(); */
|
|
isb
|
|
|
|
/* CacheSizeIdAccessor ccsidr_el1; */
|
|
mrs x3, ccsidr_el1
|
|
|
|
/* const int num_ways = ccsidr_el1.GetAssociativity(); */
|
|
ubfx x7, x3, #3, #0xA
|
|
mov w8, w7
|
|
|
|
/* const int line_size = ccsidr_el1.GetLineSize(); */
|
|
and x4, x3, #7
|
|
|
|
/* const u64 way_shift = static_cast<u64>(__builtin_clz(num_ways)); */
|
|
clz w7, w7
|
|
|
|
/* const u64 set_shift = static_cast<u64>(line_size + 4); */
|
|
add w4, w4, #4
|
|
|
|
/* const int num_sets = ccsidr_el1.GetNumberOfSets(); */
|
|
ubfx w3, w3, #0xD, #0xF
|
|
|
|
/* int way = 0; */
|
|
mov x5, #0
|
|
|
|
/* while (way <= num_ways) { */
|
|
begin_flush_cache_impl_way_loop:
|
|
cmp w8, w5
|
|
b.lt done_flush_cache_impl_way_loop
|
|
|
|
/* int set = 0; */
|
|
mov x0, #0
|
|
|
|
/* while (set <= num_sets) { */
|
|
begin_flush_cache_impl_set_loop:
|
|
cmp w3, w0
|
|
b.lt done_flush_cache_impl_set_loop
|
|
|
|
/* const u64 cisw_value = (static_cast<u64>(way) << way_shift) | (static_cast<u64>(set) << set_shift) | level_sel_value; */
|
|
lsl x2, x5, x7
|
|
lsl x1, x0, x4
|
|
orr x1, x1, x2
|
|
orr x1, x1, x6
|
|
|
|
/* __asm__ __volatile__("dc cisw, %0" :: "r"(cisw_value) : "memory"); */
|
|
dc cisw, x1
|
|
|
|
/* set++; */
|
|
add x0, x0, #1
|
|
|
|
/* } */
|
|
b begin_flush_cache_impl_set_loop
|
|
done_flush_cache_impl_set_loop:
|
|
|
|
/* way++; */
|
|
add x5, x5, 1
|
|
|
|
/* } */
|
|
b begin_flush_cache_impl_way_loop
|
|
done_flush_cache_impl_way_loop:
|
|
ret
|