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132 vana 1
#
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# Copyright (C) 2001-2004 Jakub Jermar
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# - Redistributions of source code must retain the above copyright
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#   notice, this list of conditions and the following disclaimer.
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# - Redistributions in binary form must reproduce the above copyright
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#   notice, this list of conditions and the following disclaimer in the
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#   documentation and/or other materials provided with the distribution.
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# - The name of the author may not be used to endorse or promote products
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#   derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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## very low and hardware-level functions
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952 jermar 31
# Mask for interrupts 0 - 31 (bits 0 - 31) where 0 means that int has no error word
137 vana 32
# and 1 means interrupt with error word
132 vana 33
#define ERROR_WORD_INTERRUPT_LIST 0x00027D00
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.text
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.global paging_on
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.global enable_l_apic_in_msr
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.global interrupt_handlers
1288 jermar 40
.global memcpy
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.global memcpy_from_uspace
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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_failover_address
132 vana 45
 
1288 jermar 46
 
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#define MEMCPY_DST	4
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#define MEMCPY_SRC	8
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#define MEMCPY_SIZE	12
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/** Copy memory to/from userspace.
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 *
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 * This is almost conventional memcpy().
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 * The difference is that there is a failover part
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 * to where control is returned from a page fault
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 * if the page fault occurs during copy_from_uspace()
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 * or copy_to_uspace().
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 *
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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_SIZE(%esp)	Size.
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 *
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 * @return MEMCPY_SRC(%esp) on success and 0 on failure.
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 */
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memcpy:
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memcpy_from_uspace:
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memcpy_to_uspace:
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	movl %edi, %edx				/* save %edi */
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	movl %esi, %eax				/* save %esi */
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	movl MEMCPY_SIZE(%esp), %ecx
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	shrl $2, %ecx				/* size / 4 */
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	movl MEMCPY_DST(%esp), %edi
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	movl MEMCPY_SRC(%esp), %esi
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	rep movsl				/* copy as much as possible word by word */
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	movl MEMCPY_SIZE(%esp), %ecx
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	andl $3, %ecx				/* size % 4 */
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	jz 0f
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	rep movsb				/* copy the rest byte by byte */
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0:
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	movl %edx, %edi
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	movl %eax, %esi
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	movl MEMCPY_SRC(%esp), %eax		/* MEMCPY_SRC(%esp), success */
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	ret
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/*
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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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 */
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memcpy_from_uspace_failover_address:
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memcpy_to_uspace_failover_address:
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	movl %edx, %edi
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	movl %eax, %esi
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	xorl %eax, %eax				/* return 0, failure */
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	ret
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132 vana 102
## Turn paging on
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#
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# Enable paging and write-back caching in CR0.
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#
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paging_on:
316 jermar 107
	movl %cr0,%edx
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	orl $(1<<31),%edx		# paging on
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	andl $~((1<<30)|(1<<29)),%edx	# clear Cache Disable and not Write Though
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	movl %edx,%cr0
132 vana 111
	jmp 0f
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0:
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	ret
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## Enable local APIC
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#
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# Enable local APIC in MSR.
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#
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enable_l_apic_in_msr:
316 jermar 121
	push %eax
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132 vana 123
	movl $0x1b, %ecx
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	rdmsr
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	orl $(1<<11),%eax
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	orl $(0xfee00000),%eax
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	wrmsr
316 jermar 128
 
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	pop %eax
132 vana 130
	ret
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1100 palkovsky 132
# Clear nested flag
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# overwrites %ecx
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.macro CLEAR_NT_FLAG
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	pushfl
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	pop %ecx
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	and $0xffffbfff,%ecx
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	push %ecx
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	popfl
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.endm	
132 vana 141
 
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## Declare interrupt handlers
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#
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# Declare interrupt handlers for n interrupt
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# vectors starting at vector i.
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#
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# The handlers setup data segment registers
576 palkovsky 148
# and call exc_dispatch().
132 vana 149
#
1278 palkovsky 150
#define INTERRUPT_ALIGN 64
132 vana 151
.macro handler i n
958 jermar 152
 
1100 palkovsky 153
.ifeq \i-0x30     # Syscall handler
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	push %ds
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	push %es
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	push %fs
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	push %gs
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	# Push arguments on stack
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	push %edi
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	push %esi
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	push %edx
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	push %ecx
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	push %eax
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	# we must fill the data segment registers
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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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	sti
1212 palkovsky 172
 
1100 palkovsky 173
	call syscall_handler   # syscall_handler(ax,cx,dx,si,di)
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	cli
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	addl $20, %esp         # clean-up of parameters
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177
	pop %gs
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	pop %fs
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	pop %es
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	pop %ds
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	CLEAR_NT_FLAG
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	iret
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.else	
1008 jermar 185
	/*
1021 jermar 186
	 * This macro distinguishes between two versions of ia32 exceptions.
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	 * One version has error word and the other does not have it.
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	 * The latter version fakes the error word on the stack so that the
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	 * handlers and istate_t can be the same for both types.
1008 jermar 190
	 */
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	.iflt \i-32
1021 jermar 192
		.if (1 << \i) & ERROR_WORD_INTERRUPT_LIST
1100 palkovsky 193
			/* 
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			 * With error word, do nothing
1021 jermar 195
			 */
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                .else
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                        /*
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                         * Version without error word,
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                         */
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			subl $4, %esp
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                .endif
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        .else
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                /*
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                 * Version without error word,
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                 */
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		subl $4, %esp
1100 palkovsky 207
	.endif
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132 vana 209
	push %ds
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	push %es
1016 jermar 211
	push %fs
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	push %gs
132 vana 213
 
1100 palkovsky 214
#ifdef CONFIG_DEBUG_ALLREGS
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	push %ebx
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	push %ebp
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	push %edi
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	push %esi
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#else
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	sub $16, %esp
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#endif
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	push %edx
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	push %ecx
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	push %eax
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132 vana 226
	# we must fill the data segment registers
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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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1100 palkovsky 231
	pushl %esp          # *istate
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	pushl $(\i)         # intnum
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	call exc_dispatch   # excdispatch(intnum, *istate)
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	addl $8,%esp        # Clear arguments from stack
132 vana 235
 
1100 palkovsky 236
	CLEAR_NT_FLAG # Modifies %ecx
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238
	pop %eax
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	pop %ecx
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	pop %edx
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#ifdef CONFIG_DEBUG_ALLREGS
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	pop %esi
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	pop %edi
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	pop %ebp
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	pop %ebx
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#else
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	add $16, %esp
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#endif	
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1016 jermar 250
	pop %gs
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	pop %fs
132 vana 252
	pop %es
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	pop %ds
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1021 jermar 255
	addl $4,%esp	# Skip error word, no matter whether real or fake.
316 jermar 256
	iret
1100 palkovsky 257
.endif
132 vana 258
 
1100 palkovsky 259
	.align INTERRUPT_ALIGN
132 vana 260
	.if (\n-\i)-1
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	handler "(\i+1)",\n
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	.endif
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.endm
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# keep in sync with pm.h !!!
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IDT_ITEMS=64
1100 palkovsky 267
.align INTERRUPT_ALIGN
132 vana 268
interrupt_handlers:
269
h_start:
1100 palkovsky 270
	handler 0 IDT_ITEMS
132 vana 271
h_end:
272
 
273
.data
274
.global interrupt_handler_size
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interrupt_handler_size: .long (h_end-h_start)/IDT_ITEMS