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kern: switch memset to optimized impl

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This commit is contained in:
Michael Scire 2020-07-29 17:45:23 -07:00 committed by SciresM
parent 9ddb4194b3
commit 7352d87b20
5 changed files with 25 additions and 17 deletions
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17
libraries/libmesosphere/include/mesosphere/arch/arm64/init/kern_k_init_page_table.hpp
View file

@ -23,6 +23,17 @@
namespace ams::kern::arch::arm64::init {
inline void ClearPhysicalMemory(KPhysicalAddress address, size_t size) {
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(size, sizeof(u64)));
/* This Physical Address -> void * conversion is valid, because this is init page table code. */
/* The MMU is necessarily not yet turned on, if we are creating an initial page table. */
volatile u64 *ptr = reinterpret_cast<volatile u64 *>(GetInteger(address));
for (size_t i = 0; i < size / sizeof(u64); ++i) {
ptr[i] = 0;
}
}
class KInitialPageTable {
public:
class IPageAllocator {
@ -61,9 +72,7 @@ namespace ams::kern::arch::arm64::init {
}
static ALWAYS_INLINE void ClearNewPageTable(KPhysicalAddress address) {
/* This Physical Address -> void * conversion is valid, because this is page table code. */
/* The MMU is necessarily not yet turned on, if we are creating an initial page table. */
std::memset(reinterpret_cast<void *>(GetInteger(address)), 0, PageSize);
ClearPhysicalMemory(address, PageSize);
}
private:
size_t NOINLINE GetBlockCount(KVirtualAddress virt_addr, size_t size, size_t block_size) {
@ -705,7 +714,7 @@ namespace ams::kern::arch::arm64::init {
this->state.next_address += PageSize;
}
std::memset(reinterpret_cast<void *>(allocated), 0, PageSize);
ClearPhysicalMemory(allocated, PageSize);
return allocated;
}

4
libraries/libmesosphere/source/libc/arch/arm64/memset.arch.arm64-broken.s → libraries/libmesosphere/source/libc/arch/arm64/memset.arch.arm64.s
View file

@ -76,11 +76,13 @@ L(set96):
.p2align 4
L(set_long):
stp val, val, [dstin]
bic dst, dstin, 15
#if DC_ZVA_THRESHOLD
cmp count, DC_ZVA_THRESHOLD
ccmp val, 0, 0, cs
bic dst, dstin, 15
b.eq L(zva_64)
#else
bic dst, dstin, 15
#endif
/* Small-size or non-zero memset does not use DC ZVA. */
sub count, dstend, dst

2
libraries/libmesosphere/source/libc/kern_libc_config.arch.arm64.h
View file

@ -19,6 +19,6 @@
#define MESOSPHERE_LIBC_MEMCPY_GENERIC 0
#define MESOSPHERE_LIBC_MEMCMP_GENERIC 0
#define MESOSPHERE_LIBC_MEMMOVE_GENERIC 0
#define MESOSPHERE_LIBC_MEMSET_GENERIC 1
#define MESOSPHERE_LIBC_MEMSET_GENERIC 0
#define MESOSPHERE_LIBC_STRNCPY_GENERIC 1
#define MESOSPHERE_LIBC_STRNCMP_GENERIC 1

15
mesosphere/kernel_ldr/source/kern_init_loader.cpp
View file

@ -241,9 +241,6 @@ namespace ams::kern::init::loader {
RelocateKernelPhysically(base_address, layout);
/* Validate kernel layout. */
/* TODO: constexpr 0x1000 definition somewhere. */
/* In stratosphere, this is os::MemoryPageSize. */
/* We don't have ams::os, this may go in hw:: or something. */
const uintptr_t rx_offset = layout->rx_offset;
const uintptr_t rx_end_offset = layout->rx_end_offset;
const uintptr_t ro_offset = layout->ro_offset;
@ -251,12 +248,12 @@ namespace ams::kern::init::loader {
const uintptr_t rw_offset = layout->rw_offset;
/* UNUSED: const uintptr_t rw_end_offset = layout->rw_end_offset; */
const uintptr_t bss_end_offset = layout->bss_end_offset;
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(rx_offset, 0x1000));
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(rx_end_offset, 0x1000));
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(ro_offset, 0x1000));
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(ro_end_offset, 0x1000));
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(rw_offset, 0x1000));
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(bss_end_offset, 0x1000));
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(rx_offset, PageSize));
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(rx_end_offset, PageSize));
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(ro_offset, PageSize));
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(ro_end_offset, PageSize));
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(rw_offset, PageSize));
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(bss_end_offset, PageSize));
const uintptr_t bss_offset = layout->bss_offset;
const uintptr_t ini_load_offset = layout->ini_load_offset;
const uintptr_t dynamic_offset = layout->dynamic_offset;