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Rev 3022 Rev 4055
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.text
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.text
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.global paging_on
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.global paging_on
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.global enable_l_apic_in_msr
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.global enable_l_apic_in_msr
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.global interrupt_handlers
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.global interrupt_handlers
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.global memsetb
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.global memsetw
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.global memcpy
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.global memcpy
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.global memcpy_from_uspace
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.global memcpy_from_uspace
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.global memcpy_from_uspace_failover_address
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.global memcpy_from_uspace_failover_address
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.global memcpy_to_uspace
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.global memcpy_to_uspace
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.global memcpy_to_uspace_failover_address
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.global memcpy_to_uspace_failover_address
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# Wrapper for generic memsetb
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memsetb:
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	jmp _memsetb
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# Wrapper for generic memsetw
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memsetw:
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	jmp _memsetw
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#define MEMCPY_DST	4
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#define MEMCPY_DST	4
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#define MEMCPY_SRC	8
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#define MEMCPY_SRC	8
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#define MEMCPY_SIZE	12
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#define MEMCPY_SIZE	12
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/** Copy memory to/from userspace.
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/** Copy memory to/from userspace.
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 *
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 *
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 * @param MEMCPY_DST(%esp)	Destination address.
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 * @param MEMCPY_DST(%esp)	Destination address.
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 * @param MEMCPY_SRC(%esp)	Source address.
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 * @param MEMCPY_SRC(%esp)	Source address.
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 * @param MEMCPY_SIZE(%esp)	Size.
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 * @param MEMCPY_SIZE(%esp)	Size.
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 *
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 *
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 * @return MEMCPY_SRC(%esp) on success and 0 on failure.
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 * @return MEMCPY_DST(%esp) on success and 0 on failure.
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 */
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 */
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memcpy:
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memcpy:
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memcpy_from_uspace:
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memcpy_from_uspace:
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memcpy_to_uspace:
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memcpy_to_uspace:
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	movl %edi, %edx			/* save %edi */
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	movl %edi, %edx			/* save %edi */
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	rep movsb			/* copy the rest byte by byte */
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	rep movsb			/* copy the rest byte by byte */
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0:
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0:
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	movl %edx, %edi
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	movl %edx, %edi
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	movl %eax, %esi
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	movl %eax, %esi
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	movl MEMCPY_SRC(%esp), %eax	/* MEMCPY_SRC(%esp), success */
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	movl MEMCPY_DST(%esp), %eax	/* MEMCPY_DST(%esp), success */
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	ret
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	ret
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/*
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/*
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 * We got here from as_page_fault() after the memory operations
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 * We got here from as_page_fault() after the memory operations
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 * above had caused a page fault.
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 * above had caused a page fault.
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	and $0xffffbfff, %ecx
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	and $0xffffbfff, %ecx
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	push %ecx
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	push %ecx
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	popfl
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	popfl
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.endm
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.endm
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/*
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 * The SYSENTER syscall mechanism can be used for syscalls with
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 * four or fewer arguments. To pass these four arguments, we
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 * use four registers: EDX, ECX, EBX, ESI. The syscall number
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 * is passed in EAX. We use EDI to remember the return address
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 * and EBP to remember the stack. The INT-based syscall mechanism
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 * can actually handle six arguments plus the syscall number
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 * entirely in registers.
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 */
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.global sysenter_handler
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sysenter_handler:
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	sti
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	pushl %ebp	# remember user stack
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	pushl %edi	# remember return user address
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	pushl %gs	# remember TLS
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	pushl %eax	# syscall number
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	subl $8, %esp	# unused sixth and fifth argument
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	pushl %esi	# fourth argument
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	pushl %ebx	# third argument
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	pushl %ecx	# second argument
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	pushl %edx	# first argument
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	movw $16, %ax
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	movw %ax, %ds
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	movw %ax, %es
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	cld
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	call syscall_handler
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	addl $28, %esp	# remove arguments from stack
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	pop %gs		# restore TLS
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	pop %edx	# prepare return EIP for SYSEXIT
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	pop %ecx	# prepare userspace ESP for SYSEXIT
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	sysexit		# return to userspace
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## Declare interrupt handlers
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## Declare interrupt handlers
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#
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#
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# Declare interrupt handlers for n interrupt
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# Declare interrupt handlers for n interrupt
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# vectors starting at vector i.
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# vectors starting at vector i.
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#
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#
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	pushl %ds
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	pushl %ds
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	pushl %es
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	pushl %es
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	pushl %fs
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	pushl %fs
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	pushl %gs
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	pushl %gs
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#ifdef CONFIG_DEBUG_ALLREGS
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	pushl %ebx
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	pushl %ebp
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	pushl %edi
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	pushl %esi
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#else
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	subl $16, %esp
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#endif
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	pushl %edx
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	pushl %edx
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	pushl %ecx
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	pushl %ecx
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	pushl %eax
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	pushl %eax
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	# we must fill the data segment registers
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	# we must fill the data segment registers
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	CLEAR_NT_FLAG # Modifies %ecx
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	CLEAR_NT_FLAG # Modifies %ecx
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	popl %eax
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	popl %eax
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	popl %ecx
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	popl %ecx
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	popl %edx
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	popl %edx
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#ifdef CONFIG_DEBUG_ALLREGS
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	popl %esi
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	popl %edi
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	popl %ebp
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	popl %ebx
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#else
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	addl $16, %esp
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#endif
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	popl %gs
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	popl %gs
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	popl %fs
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	popl %fs
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	popl %es
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	popl %es
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	popl %ds
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	popl %ds