Add a sysctl to control 8254 bios overwrite warnings. Default is on.
[dragonfly.git] / sys / i386 / icu / icu_vector.s
1 /*
2  *      from: vector.s, 386BSD 0.1 unknown origin
3  * $FreeBSD: src/sys/i386/isa/icu_vector.s,v 1.14.2.2 2000/07/18 21:12:42 dfr Exp $
4  * $DragonFly: src/sys/i386/icu/Attic/icu_vector.s,v 1.16 2004/01/30 05:42:16 dillon Exp $
5  */
6
7 /*
8  * modified for PC98 by Kakefuda
9  */
10
11 #ifdef PC98
12 #define ICU_IMR_OFFSET          2       /* IO_ICU{1,2} + 2 */
13 #else
14 #define ICU_IMR_OFFSET          1       /* IO_ICU{1,2} + 1 */
15 #endif
16
17 #define ICU_EOI                 0x20    /* XXX - define elsewhere */
18
19 #define IRQ_LBIT(irq_num)       (1 << (irq_num))
20 #define IRQ_BIT(irq_num)        (1 << ((irq_num) % 8))
21 #define IRQ_BYTE(irq_num)       ((irq_num) >> 3)
22
23 #ifdef AUTO_EOI_1
24 #define ENABLE_ICU1             /* use auto-EOI to reduce i/o */
25 #define OUTB_ICU1
26 #else
27 #define ENABLE_ICU1                                                     \
28         movb    $ICU_EOI,%al ;  /* as soon as possible send EOI ... */  \
29         OUTB_ICU1 ;             /* ... to clear in service bit */       \
30
31 #define OUTB_ICU1                                                       \
32         outb    %al,$IO_ICU1 ;                                          \
33
34 #endif
35
36 #ifdef AUTO_EOI_2
37 /*
38  * The data sheet says no auto-EOI on slave, but it sometimes works.
39  */
40 #define ENABLE_ICU1_AND_2       ENABLE_ICU1
41 #else
42 #define ENABLE_ICU1_AND_2                                               \
43         movb    $ICU_EOI,%al ;  /* as above */                          \
44         outb    %al,$IO_ICU2 ;  /* but do second icu first ... */       \
45         OUTB_ICU1 ;     /* ... then first icu (if !AUTO_EOI_1) */       \
46
47 #endif
48
49 /*
50  * Macro helpers
51  */
52 #define PUSH_FRAME                                                      \
53         pushl   $0 ;            /* dummy error code */                  \
54         pushl   $0 ;            /* dummy trap type */                   \
55         pushal ;                /* 8 registers */                       \
56         pushl   %ds ;                                                   \
57         pushl   %es ;                                                   \
58         pushl   %fs ;                                                   \
59         mov     $KDSEL,%ax ;                                            \
60         mov     %ax,%ds ;                                               \
61         mov     %ax,%es ;                                               \
62         mov     $KPSEL,%ax ;                                            \
63         mov     %ax,%fs ;                                               \
64
65 #define PUSH_DUMMY                                                      \
66         pushfl ;                /* phys int frame / flags */            \
67         pushl %cs ;             /* phys int frame / cs */               \
68         pushl   12(%esp) ;      /* original caller eip */               \
69         pushl   $0 ;            /* dummy error code */                  \
70         pushl   $0 ;            /* dummy trap type */                   \
71         subl    $12*4,%esp ;    /* pushal + 3 seg regs (dummy) + CPL */ \
72
73 /*
74  * Warning: POP_FRAME can only be used if there is no chance of a
75  * segment register being changed (e.g. by procfs), which is why syscalls
76  * have to use doreti.
77  */
78 #define POP_FRAME                                                       \
79         popl    %fs ;                                                   \
80         popl    %es ;                                                   \
81         popl    %ds ;                                                   \
82         popal ;                                                         \
83         addl    $2*4,%esp ;     /* dummy trap & error codes */          \
84
85 #define POP_DUMMY                                                       \
86         addl    $17*4,%esp ;                                            \
87
88 #define MASK_IRQ(icu, irq_num)                                          \
89         movb    imen + IRQ_BYTE(irq_num),%al ;                          \
90         orb     $IRQ_BIT(irq_num),%al ;                                 \
91         movb    %al,imen + IRQ_BYTE(irq_num) ;                          \
92         outb    %al,$icu+ICU_IMR_OFFSET ;                               \
93
94 #define UNMASK_IRQ(icu, irq_num)                                        \
95         movb    imen + IRQ_BYTE(irq_num),%al ;                          \
96         andb    $~IRQ_BIT(irq_num),%al ;                                \
97         movb    %al,imen + IRQ_BYTE(irq_num) ;                          \
98         outb    %al,$icu+ICU_IMR_OFFSET ;                               \
99         
100 /*
101  * Fast interrupt call handlers run in the following sequence:
102  *
103  *      - Push the trap frame required by doreti.
104  *      - Mask the interrupt and reenable its source.
105  *      - If we cannot take the interrupt set its fpending bit and
106  *        doreti.
107  *      - If we can take the interrupt clear its fpending bit,
108  *        call the handler, then unmask the interrupt and doreti.
109  *
110  *      YYY can cache gd base pointer instead of using hidden %fs
111  *      prefixes.
112  */
113
114 #define FAST_INTR(irq_num, vec_name, icu, enable_icus, maybe_extra_ipending) \
115         .text ;                                                         \
116         SUPERALIGN_TEXT ;                                               \
117 IDTVEC(vec_name) ;                                                      \
118         PUSH_FRAME ;                                                    \
119         FAKE_MCOUNT(13*4(%esp)) ;                                       \
120         maybe_extra_ipending ;                                          \
121         MASK_IRQ(icu, irq_num) ;                                        \
122         enable_icus ;                                                   \
123         movl    PCPU(curthread),%ebx ;                                  \
124         movl    TD_CPL(%ebx),%eax ;     /* save the cpl for doreti */   \
125         pushl   %eax ;                                                  \
126         cmpl    $TDPRI_CRIT,TD_PRI(%ebx) ;                              \
127         jge     1f ;                                                    \
128         testl   $IRQ_LBIT(irq_num), %eax ;                              \
129         jz      2f ;                                                    \
130 1: ;                                                                    \
131         /* set pending bit and return, leave interrupt masked */        \
132         orl     $IRQ_LBIT(irq_num),PCPU(fpending) ;                     \
133         orl     $RQF_INTPEND, PCPU(reqflags) ;                          \
134         jmp     5f ;                                                    \
135 2: ;                                                                    \
136         /* clear pending bit, run handler */                            \
137         incl    PCPU(intr_nesting_level) ;                              \
138         addl    $TDPRI_CRIT,TD_PRI(%ebx) ;                              \
139         andl    $~IRQ_LBIT(irq_num),PCPU(fpending) ;                    \
140         pushl   intr_unit + (irq_num) * 4 ;                             \
141         call    *intr_handler + (irq_num) * 4 ;                         \
142         addl    $4,%esp ;                                               \
143         subl    $TDPRI_CRIT,TD_PRI(%ebx) ;                              \
144         decl    PCPU(intr_nesting_level) ;                              \
145         incl    PCPU(cnt)+V_INTR ; /* book-keeping YYY make per-cpu */  \
146         movl    intr_countp + (irq_num) * 4,%eax ;                      \
147         incl    (%eax) ;                                                \
148         UNMASK_IRQ(icu, irq_num) ;                                      \
149 5: ;                                                                    \
150         MEXITCOUNT ;                                                    \
151         jmp     doreti ;                                                \
152
153 /*
154  * Restart fast interrupt held up by critical section or cpl.
155  *
156  *      - Push a dummy trap frame as required by doreti.
157  *      - The interrupt source is already masked.
158  *      - Clear the fpending bit
159  *      - Run the handler
160  *      - Unmask the interrupt
161  *      - Pop the dummy frame and do a normal return
162  *
163  *      YYY can cache gd base pointer instead of using hidden %fs
164  *      prefixes.
165  */
166 #define FAST_UNPEND(irq_num, vec_name, icu)                             \
167         .text ;                                                         \
168         SUPERALIGN_TEXT ;                                               \
169 IDTVEC(vec_name) ;                                                      \
170         pushl   %ebp ;                                                  \
171         movl    %esp,%ebp ;                                             \
172         PUSH_DUMMY ;                                                    \
173         pushl   intr_unit + (irq_num) * 4 ;                             \
174         call    *intr_handler + (irq_num) * 4 ;                         \
175         addl    $4, %esp ;                                              \
176         incl    PCPU(cnt)+V_INTR ;                                      \
177         movl    intr_countp + (irq_num) * 4, %eax ;                     \
178         incl    (%eax) ;                                                \
179         UNMASK_IRQ(icu, irq_num) ;                                      \
180         POP_DUMMY ;                                                     \
181         popl %ebp ;                                                     \
182         ret ;                                                           \
183
184 /*
185  * Slow interrupt call handlers run in the following sequence:
186  *
187  *      - Push the trap frame required by doreti.
188  *      - Mask the interrupt and reenable its source.
189  *      - If we cannot take the interrupt set its ipending bit and
190  *        doreti.  In addition to checking for a critical section
191  *        and cpl mask we also check to see if the thread is still
192  *        running.
193  *      - If we can take the interrupt clear its ipending bit
194  *        and schedule its thread.  Leave interrupts masked and doreti.
195  *
196  *      sched_ithd() is called with interrupts enabled and outside of a
197  *      critical section (so it can preempt us).
198  *
199  *      YYY sched_ithd may preempt us synchronously (fix interrupt stacking)
200  *
201  *      Note that intr_nesting_level is not bumped during sched_ithd because
202  *      blocking allocations are allowed in the preemption case.
203  *
204  *      YYY can cache gd base pointer instead of using hidden %fs
205  *      prefixes.
206  */
207
208 #define INTR(irq_num, vec_name, icu, enable_icus, reg, maybe_extra_ipending) \
209         .text ;                                                         \
210         SUPERALIGN_TEXT ;                                               \
211 IDTVEC(vec_name) ;                                                      \
212         PUSH_FRAME ;                                                    \
213         FAKE_MCOUNT(13*4(%esp)) ;                                       \
214         maybe_extra_ipending ;                                          \
215         MASK_IRQ(icu, irq_num) ;                                        \
216         enable_icus ;                                                   \
217         movl    PCPU(curthread),%ebx ;                                  \
218         movl    TD_CPL(%ebx), %eax ;                                    \
219         pushl   %eax ;          /* push CPL for doreti */               \
220         cmpl    $TDPRI_CRIT,TD_PRI(%ebx) ;                              \
221         jge     1f ;                                                    \
222         testl   $IRQ_LBIT(irq_num), %eax ;                              \
223         jz      2f ;                                                    \
224 1: ;                                                                    \
225         /* set the pending bit and return, leave interrupt masked */    \
226         orl     $IRQ_LBIT(irq_num), PCPU(ipending) ;                    \
227         orl     $RQF_INTPEND, PCPU(reqflags) ;                          \
228         jmp     5f ;                                                    \
229 2: ;                                                                    \
230         /* set running bit, clear pending bit, run handler */           \
231         andl    $~IRQ_LBIT(irq_num), PCPU(ipending) ;                   \
232         sti ;                                                           \
233         pushl   $irq_num ;                                              \
234         call    sched_ithd ;                                            \
235         addl    $4,%esp ;                                               \
236         incl    PCPU(cnt)+V_INTR ; /* book-keeping YYY make per-cpu */  \
237         movl    intr_countp + (irq_num) * 4,%eax ;                      \
238         incl    (%eax) ;                                                \
239 5: ;                                                                    \
240         MEXITCOUNT ;                                                    \
241         jmp     doreti ;                                                \
242
243 /*
244  * Unmask a slow interrupt.  This function is used by interrupt threads
245  * after they have descheduled themselves to reenable interrupts and
246  * possibly cause a reschedule to occur.
247  */
248
249 #define INTR_UNMASK(irq_num, vec_name, icu)                             \
250         .text ;                                                         \
251         SUPERALIGN_TEXT ;                                               \
252 IDTVEC(vec_name) ;                                                      \
253         pushl %ebp ;     /* frame for ddb backtrace */                  \
254         movl    %esp, %ebp ;                                            \
255         UNMASK_IRQ(icu, irq_num) ;                                      \
256         popl %ebp ;                                                     \
257         ret ;                                                           \
258
259 MCOUNT_LABEL(bintr)
260         FAST_INTR(0,fastintr0, IO_ICU1, ENABLE_ICU1,)
261         FAST_INTR(1,fastintr1, IO_ICU1, ENABLE_ICU1,)
262         FAST_INTR(2,fastintr2, IO_ICU1, ENABLE_ICU1,)
263         FAST_INTR(3,fastintr3, IO_ICU1, ENABLE_ICU1,)
264         FAST_INTR(4,fastintr4, IO_ICU1, ENABLE_ICU1,)
265         FAST_INTR(5,fastintr5, IO_ICU1, ENABLE_ICU1,)
266         FAST_INTR(6,fastintr6, IO_ICU1, ENABLE_ICU1,)
267         FAST_INTR(7,fastintr7, IO_ICU1, ENABLE_ICU1,)
268         FAST_INTR(8,fastintr8, IO_ICU2, ENABLE_ICU1_AND_2,)
269         FAST_INTR(9,fastintr9, IO_ICU2, ENABLE_ICU1_AND_2,)
270         FAST_INTR(10,fastintr10, IO_ICU2, ENABLE_ICU1_AND_2,)
271         FAST_INTR(11,fastintr11, IO_ICU2, ENABLE_ICU1_AND_2,)
272         FAST_INTR(12,fastintr12, IO_ICU2, ENABLE_ICU1_AND_2,)
273         FAST_INTR(13,fastintr13, IO_ICU2, ENABLE_ICU1_AND_2,)
274         FAST_INTR(14,fastintr14, IO_ICU2, ENABLE_ICU1_AND_2,)
275         FAST_INTR(15,fastintr15, IO_ICU2, ENABLE_ICU1_AND_2,)
276
277         INTR(0,intr0, IO_ICU1, ENABLE_ICU1, al,)
278         INTR(1,intr1, IO_ICU1, ENABLE_ICU1, al,)
279         INTR(2,intr2, IO_ICU1, ENABLE_ICU1, al,)
280         INTR(3,intr3, IO_ICU1, ENABLE_ICU1, al,)
281         INTR(4,intr4, IO_ICU1, ENABLE_ICU1, al,)
282         INTR(5,intr5, IO_ICU1, ENABLE_ICU1, al,)
283         INTR(6,intr6, IO_ICU1, ENABLE_ICU1, al,)
284         INTR(7,intr7, IO_ICU1, ENABLE_ICU1, al,)
285         INTR(8,intr8, IO_ICU2, ENABLE_ICU1_AND_2, ah,)
286         INTR(9,intr9, IO_ICU2, ENABLE_ICU1_AND_2, ah,)
287         INTR(10,intr10, IO_ICU2, ENABLE_ICU1_AND_2, ah,)
288         INTR(11,intr11, IO_ICU2, ENABLE_ICU1_AND_2, ah,)
289         INTR(12,intr12, IO_ICU2, ENABLE_ICU1_AND_2, ah,)
290         INTR(13,intr13, IO_ICU2, ENABLE_ICU1_AND_2, ah,)
291         INTR(14,intr14, IO_ICU2, ENABLE_ICU1_AND_2, ah,)
292         INTR(15,intr15, IO_ICU2, ENABLE_ICU1_AND_2, ah,)
293
294         FAST_UNPEND(0,fastunpend0, IO_ICU1)
295         FAST_UNPEND(1,fastunpend1, IO_ICU1)
296         FAST_UNPEND(2,fastunpend2, IO_ICU1)
297         FAST_UNPEND(3,fastunpend3, IO_ICU1)
298         FAST_UNPEND(4,fastunpend4, IO_ICU1)
299         FAST_UNPEND(5,fastunpend5, IO_ICU1)
300         FAST_UNPEND(6,fastunpend6, IO_ICU1)
301         FAST_UNPEND(7,fastunpend7, IO_ICU1)
302         FAST_UNPEND(8,fastunpend8, IO_ICU2)
303         FAST_UNPEND(9,fastunpend9, IO_ICU2)
304         FAST_UNPEND(10,fastunpend10, IO_ICU2)
305         FAST_UNPEND(11,fastunpend11, IO_ICU2)
306         FAST_UNPEND(12,fastunpend12, IO_ICU2)
307         FAST_UNPEND(13,fastunpend13, IO_ICU2)
308         FAST_UNPEND(14,fastunpend14, IO_ICU2)
309         FAST_UNPEND(15,fastunpend15, IO_ICU2)
310 MCOUNT_LABEL(eintr)
311
312         .data
313
314         .text