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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
parent 4a38e5d4b6
commit 911a81430a
4 changed files with 19 additions and 8 deletions
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17
libmesosphere/include/mesosphere/arch/arm64/init/kern_k_init_page_table.hpp
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@ -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
libmesosphere/source/libc/arch/arm64/memset.arch.arm64-broken.s → libmesosphere/source/libc/arch/arm64/memset.arch.arm64.s
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@ -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

4
libmesosphere/source/libc/kern_libc_config.arch.arm64.h
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@ -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
#define MESOSPHERE_LIBC_STRNCMP_GENERIC 1

2
libmesosphere/source/libc/kern_libc_config.h
View File

@ -23,4 +23,4 @@
#error "Unknown architecture for libc"
#endif
#endif