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132 vana 1
#
2071 jermar 2
# Copyright (c) 2001-2004 Jakub Jermar
132 vana 3
# 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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37
.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
 
47
#define MEMCPY_DST	4
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#define MEMCPY_SRC	8
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#define MEMCPY_SIZE	12
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51
/** 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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 *
59
 * @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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71
	movl MEMCPY_SIZE(%esp), %ecx
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	shrl $2, %ecx				/* size / 4 */
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74
	movl MEMCPY_DST(%esp), %edi
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	movl MEMCPY_SRC(%esp), %esi
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77
	rep movsl				/* copy as much as possible word by word */
78
 
79
	movl MEMCPY_SIZE(%esp), %ecx
80
	andl $3, %ecx				/* size % 4 */
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	jz 0f
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83
	rep movsb				/* copy the rest byte by byte */
84
 
85
0:
86
	movl %edx, %edi
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	movl %eax, %esi
88
	movl MEMCPY_SRC(%esp), %eax		/* MEMCPY_SRC(%esp), success */
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	ret
90
 
91
/*
92
 * We got here from as_page_fault() after the memory operations
93
 * above had caused a page fault.
94
 */
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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
108
	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:
113
	ret
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116
## Enable local APIC
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#
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# Enable local APIC in MSR.
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#
120
enable_l_apic_in_msr:
316 jermar 121
	push %eax
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132 vana 123
	movl $0x1b, %ecx
124
	rdmsr
125
	orl $(1<<11),%eax
126
	orl $(0xfee00000),%eax
127
	wrmsr
316 jermar 128
 
129
	pop %eax
132 vana 130
	ret
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1100 palkovsky 132
# Clear nested flag
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# overwrites %ecx
134
.macro CLEAR_NT_FLAG
135
	pushfl
136
	pop %ecx
137
	and $0xffffbfff,%ecx
138
	push %ecx
139
	popfl
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.endm	
132 vana 141
 
142
## 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
157
	push %gs
158
 
159
	# Push arguments on stack
160
	push %edi
161
	push %esi
162
	push %edx
163
	push %ecx
164
	push %eax
165
 
166
	# we must fill the data segment registers
167
	movw $16,%ax
168
	movw %ax,%ds
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	movw %ax,%es
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171
	sti
1212 palkovsky 172
 
1100 palkovsky 173
	call syscall_handler   # syscall_handler(ax,cx,dx,si,di)
174
	cli
175
	addl $20, %esp         # clean-up of parameters
176
 
177
	pop %gs
178
	pop %fs
179
	pop %es
180
	pop %ds
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182
	CLEAR_NT_FLAG
183
	iret
184
.else	
1008 jermar 185
	/*
1021 jermar 186
	 * This macro distinguishes between two versions of ia32 exceptions.
187
	 * One version has error word and the other does not have it.
188
	 * 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
	 */
191
	.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
			 */
196
                .else
197
                        /*
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                         * Version without error word,
199
                         */
200
			subl $4, %esp
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                .endif
202
        .else
203
                /*
204
                 * Version without error word,
205
                 */
206
		subl $4, %esp
1100 palkovsky 207
	.endif
208
 
132 vana 209
	push %ds
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	push %es
1016 jermar 211
	push %fs
212
	push %gs
132 vana 213
 
1100 palkovsky 214
#ifdef CONFIG_DEBUG_ALLREGS
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	push %ebx
216
	push %ebp
217
	push %edi
218
	push %esi
219
#else
220
	sub $16, %esp
221
#endif
222
	push %edx
223
	push %ecx
224
	push %eax
225
 
132 vana 226
	# we must fill the data segment registers
227
	movw $16,%ax
228
	movw %ax,%ds
229
	movw %ax,%es
230
 
1100 palkovsky 231
	pushl %esp          # *istate
232
	pushl $(\i)         # intnum
233
	call exc_dispatch   # excdispatch(intnum, *istate)
234
	addl $8,%esp        # Clear arguments from stack
132 vana 235
 
1100 palkovsky 236
	CLEAR_NT_FLAG # Modifies %ecx
237
 
238
	pop %eax
239
	pop %ecx
240
	pop %edx
241
#ifdef CONFIG_DEBUG_ALLREGS
242
	pop %esi
243
	pop %edi
244
	pop %ebp
245
	pop %ebx
246
#else
247
	add $16, %esp
248
#endif	
249
 
1016 jermar 250
	pop %gs
251
	pop %fs
132 vana 252
	pop %es
253
	pop %ds
254
 
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
261
	handler "(\i+1)",\n
262
	.endif
263
.endm
264
 
265
# keep in sync with pm.h !!!
266
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
275
 
276
interrupt_handler_size: .long (h_end-h_start)/IDT_ITEMS