kernel/x86[_64]: remove get_optimized_functions from cpu modules

The possibility to specify custom memcpy and memset implementations
in cpu modules is currently unused and there is generally no point
in such feature.

There are only 2 x86 vendors that really matter and there isn't
very big difference in performance of the generic optmized versions
of these funcions across different models. Even if we wanted different
versions of memset and memcpy depending on the processor model or
features much better solution would be to use STT_GNU_IFUNC and save
one indirect call.

Long story short, we don't really benefit in any way from
get_optimized_functions and the feature it implements and it only adds
unnecessary complexity to the code.

Signed-off-by: Paweł Dziepak <pdziepak@quarnos.org>

headers/private/kernel/arch/x86/arch_cpu.h

@@ -262,13 +262,6 @@ typedef struct x86_mtrr_info {
 	uint8	type;
 } x86_mtrr_info;
 
-typedef struct x86_optimized_functions {
-	void 	(*memcpy)(void* dest, const void* source, size_t count);
-	void*	memcpy_end;
-	void 	(*memset)(void* dest, int value, size_t count);
-	void*	memset_end;
-} x86_optimized_functions;
-
 typedef struct x86_cpu_module_info {
 	module_info	info;
 	uint32		(*count_mtrrs)(void);
@@ -280,8 +273,6 @@ typedef struct x86_cpu_module_info {
 					uint8* _type);
 	void		(*set_mtrrs)(uint8 defaultType, const x86_mtrr_info* infos,
 					uint32 count);
-
-	void		(*get_optimized_functions)(x86_optimized_functions* functions);
 } x86_cpu_module_info;
 
 // features

src/system/kernel/arch/x86/arch_cpu.cpp

@@ -105,17 +105,8 @@ static const size_t kDoubleFaultStackSize = 4096;	// size per CPU
 static x86_cpu_module_info* sCpuModule;
 
 
-extern "C" void memcpy_generic(void* dest, const void* source, size_t count);
-extern int memcpy_generic_end;
-extern "C" void memset_generic(void* dest, int value, size_t count);
-extern int memset_generic_end;
-
-x86_optimized_functions gOptimizedFunctions = {
-	memcpy_generic,
-	&memcpy_generic_end,
-	memset_generic,
-	&memset_generic_end
-};
+extern int memcpy_end;
+extern int memset_end;
 
 /* CPU topology information */
 static uint32 (*sGetCPUTopologyID)(int currentCPU);
@@ -1163,33 +1154,13 @@ arch_cpu_init_post_modules(kernel_args* args)
 		call_all_cpus(&init_mtrrs, NULL);
 	}
 
-	// get optimized functions from the CPU module
-	if (sCpuModule != NULL && sCpuModule->get_optimized_functions != NULL) {
-		x86_optimized_functions functions;
-		memset(&functions, 0, sizeof(functions));
-
-		sCpuModule->get_optimized_functions(&functions);
-
-		if (functions.memcpy != NULL) {
-			gOptimizedFunctions.memcpy = functions.memcpy;
-			gOptimizedFunctions.memcpy_end = functions.memcpy_end;
-		}
-
-		if (functions.memset != NULL) {
-			gOptimizedFunctions.memset = functions.memset;
-			gOptimizedFunctions.memset_end = functions.memset_end;
-		}
-	}
-
 	// put the optimized functions into the commpage
-	size_t memcpyLen = (addr_t)gOptimizedFunctions.memcpy_end
-		- (addr_t)gOptimizedFunctions.memcpy;
+	size_t memcpyLen = (addr_t)&memcpy_end - (addr_t)memcpy;
 	addr_t memcpyPosition = fill_commpage_entry(COMMPAGE_ENTRY_X86_MEMCPY,
-		(const void*)gOptimizedFunctions.memcpy, memcpyLen);
-	size_t memsetLen = (addr_t)gOptimizedFunctions.memset_end
-		- (addr_t)gOptimizedFunctions.memset;
+		(const void*)memcpy, memcpyLen);
+	size_t memsetLen = (addr_t)&memset_end - (addr_t)memset;
 	addr_t memsetPosition = fill_commpage_entry(COMMPAGE_ENTRY_X86_MEMSET,
-		(const void*)gOptimizedFunctions.memset, memsetLen);
+		(const void*)memset, memsetLen);
 	size_t threadExitLen = (addr_t)x86_end_userspace_thread_exit
 		- (addr_t)x86_userspace_thread_exit;
 	addr_t threadExitPosition = fill_commpage_entry(

src/system/kernel/arch/x86/asm_offsets.cpp

@@ -79,12 +79,6 @@ dummy()
 	DEFINE_OFFSET_MACRO(SYSCALL_INFO, syscall_info, function);
 	DEFINE_OFFSET_MACRO(SYSCALL_INFO, syscall_info, parameter_size);
 
-	// struct x86_optimized_functions
-	DEFINE_OFFSET_MACRO(X86_OPTIMIZED_FUNCTIONS, x86_optimized_functions,
-		memcpy);
-	DEFINE_OFFSET_MACRO(X86_OPTIMIZED_FUNCTIONS, x86_optimized_functions,
-		memset);
-
 	// struct signal_frame_data
 	DEFINE_SIZEOF_MACRO(SIGNAL_FRAME_DATA, signal_frame_data);
 	DEFINE_OFFSET_MACRO(SIGNAL_FRAME_DATA, signal_frame_data, info);

src/system/kernel/lib/arch/x86/arch_string.S

@@ -6,22 +6,12 @@
  * Distributed under the terms of the NewOS License.
 */
 
-#if !_BOOT_MODE
-#	include "asm_offsets.h"
-#endif
 
 #include <asm_defs.h>
 
 
-// We don't need the indirection in the boot loader.
-#if _BOOT_MODE
-#	define memcpy_generic	memcpy
-#	define memset_generic	memset
-#endif
-
-
 .align 4
-FUNCTION(memcpy_generic):
+FUNCTION(memcpy):
 	pushl	%esi
 	pushl	%edi
 	movl	12(%esp),%edi	/* dest */
@@ -45,13 +35,13 @@ FUNCTION(memcpy_generic):
 	popl	%edi
 	popl	%esi
 	ret
-FUNCTION_END(memcpy_generic)
-SYMBOL(memcpy_generic_end):
+FUNCTION_END(memcpy)
+SYMBOL(memcpy_end):
 
 
 /* void *memset(void *dest, int value, size_t length); */
 .align 4
-FUNCTION(memset_generic):
+FUNCTION(memset):
 	push	%ebp
 	mov		%esp, %ebp
 
@@ -111,19 +101,6 @@ FUNCTION(memset_generic):
 	mov		%ebp, %esp
 	pop		%ebp
 	ret
-FUNCTION_END(memset_generic)
-SYMBOL(memset_generic_end):
-
-
-#if !_BOOT_MODE
-
-.align 4
-FUNCTION(memcpy):
-	jmp		*(gOptimizedFunctions + X86_OPTIMIZED_FUNCTIONS_memcpy)
-FUNCTION_END(memcpy)
-
-FUNCTION(memset):
-	jmp		*(gOptimizedFunctions + X86_OPTIMIZED_FUNCTIONS_memset)
 FUNCTION_END(memset)
+SYMBOL(memset_end):
 
-#endif	// !_BOOT_MODE

src/system/kernel/lib/arch/x86_64/arch_string.S

@@ -6,11 +6,9 @@
 
 #include <asm_defs.h>
 
-#include "asm_offsets.h"
-
 
 .align 8
-FUNCTION(memcpy_generic):
+FUNCTION(memcpy):
 	push	%rbp
 	movq	%rsp, %rbp
 
@@ -59,12 +57,12 @@ FUNCTION(memcpy_generic):
 
 	pop		%rbp
 	ret
-FUNCTION_END(memcpy_generic)
-SYMBOL(memcpy_generic_end):
+FUNCTION_END(memcpy)
+SYMBOL(memcpy_end):
 
 
 .align 8
-FUNCTION(memset_generic):
+FUNCTION(memset):
 	push	%rbp
 	movq	%rsp, %rbp
 
@@ -82,15 +80,6 @@ FUNCTION(memset_generic):
 	movq	%r8, %rax
 	pop		%rbp
 	ret
-FUNCTION_END(memset_generic)
-SYMBOL(memset_generic_end):
-
-
-FUNCTION(memcpy):
-	jmp		*(gOptimizedFunctions + X86_OPTIMIZED_FUNCTIONS_memcpy)
-FUNCTION_END(memcpy)
-
-FUNCTION(memset):
-	jmp		*(gOptimizedFunctions + X86_OPTIMIZED_FUNCTIONS_memset)
 FUNCTION_END(memset)
+SYMBOL(memset_end):