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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [powerpc/] [shared/] [irq/] [irq_asm.S] - Blame information for rev 562

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/*
 *  This file contains the assembly code for the PowerPC
 *  IRQ veneers for RTEMS.
 *
 *  The license and distribution terms for this file may be
 *  found in found in the file LICENSE in this distribution or at
 *  http://www.OARcorp.com/rtems/license.html.
 *
 *  Modified to support the MCP750.
 *  Modifications Copyright (C) 1999 Eric Valette. valette@crf.canon.fr
 *
 *
 * $Id: irq_asm.S,v 1.2 2001-09-27 12:01:06 chris Exp $
 */
 
#include 
#include 
#include 
#include 
#include "asm.h"
 
 
#define SYNC \
        sync; \
        isync
 
        .text
        .p2align 5
 
        PUBLIC_VAR(decrementer_exception_vector_prolog_code)
 
SYM (decrementer_exception_vector_prolog_code):
        /*
         * let room for exception frame
         */
        stwu    r1, - (EXCEPTION_FRAME_END)(r1)
        stw     r4, GPR4_OFFSET(r1)
        li      r4, ASM_DEC_VECTOR
        ba      shared_raw_irq_code_entry
 
        PUBLIC_VAR (decrementer_exception_vector_prolog_code_size)
 
        decrementer_exception_vector_prolog_code_size = . - decrementer_exception_vector_prolog_code
 
        PUBLIC_VAR(external_exception_vector_prolog_code)
 
SYM (external_exception_vector_prolog_code):
        /*
         * let room for exception frame
         */
        stwu    r1, - (EXCEPTION_FRAME_END)(r1)
        stw     r4, GPR4_OFFSET(r1)
        li      r4, ASM_EXT_VECTOR
        ba      shared_raw_irq_code_entry
 
        PUBLIC_VAR (external_exception_vector_prolog_code_size)
 
        external_exception_vector_prolog_code_size = . - external_exception_vector_prolog_code
 
        PUBLIC_VAR(shared_raw_irq_code_entry)
        PUBLIC_VAR(C_dispatch_irq_handler)
 
        .p2align 5
SYM (shared_raw_irq_code_entry):
        /*
         * Entry conditions :
         *      Registers already saved : R1, R4
         *      R1  :   points to a location with enough room for the
         *              interrupt frame
         *      R4  :   vector number
         */
        /*
         * Save SRR0/SRR1 As soon As possible as it is the minimal needed
         * to reenable exception processing
         */
        stw     r0, GPR0_OFFSET(r1)
        stw     r2, GPR2_OFFSET(r1)
        stw     r3, GPR3_OFFSET(r1)
 
        mfsrr0  r0
        mfsrr1  r2
        mfmsr   r3
 
        stw     r0, SRR0_FRAME_OFFSET(r1)
        stw     r2, SRR1_FRAME_OFFSET(r1)
        /*
         * Enable data and instruction address translation, exception recovery
     *
     * also, on CPUs with FP, enable FP so that FP context can be
     * saved and restored (using FP instructions)
         */
#if (PPC_HAS_FPU == 0)
        ori     r3, r3, MSR_RI | MSR_IR | MSR_DR
#else
        ori     r3, r3, MSR_RI | MSR_IR | MSR_DR | MSR_FP
#endif
        mtmsr   r3
        SYNC
        /*
         * Push C scratch registers on the current stack. It may
         * actually be the thread stack or the interrupt stack.
         * Anyway we have to make it in order to be able to call C/C++
         * functions. Depending on the nesting interrupt level, we will
         * switch to the right stack later.
         */
        stw     r5, GPR5_OFFSET(r1)
        stw     r6, GPR6_OFFSET(r1)
        stw     r7, GPR7_OFFSET(r1)
        stw     r8, GPR8_OFFSET(r1)
        stw     r9, GPR9_OFFSET(r1)
        stw     r10, GPR10_OFFSET(r1)
        stw     r11, GPR11_OFFSET(r1)
        stw     r12, GPR12_OFFSET(r1)
        stw     r13, GPR13_OFFSET(r1)
 
        mfcr    r5
        mfctr   r6
        mfxer   r7
        mflr    r8
 
        stw     r5,  EXC_CR_OFFSET(r1)
        stw     r6,  EXC_CTR_OFFSET(r1)
        stw     r7,  EXC_XER_OFFSET(r1)
        stw     r8,  EXC_LR_OFFSET(r1)
 
        /*
         * Add some non volatile registers to store information
         * that will be used when returning from C handler
         */
        stw     r14, GPR14_OFFSET(r1)
        stw     r15, GPR15_OFFSET(r1)
        /*
         * save current stack pointer location in R14
         */
        addi    r14, r1, 0
        /*
         * store part of _Thread_Dispatch_disable_level address in R15
         */
        addis r15,0, _Thread_Dispatch_disable_level@ha
        /*
         * Get current nesting level in R2
         */
        mfspr   r2, SPRG0
        /*
         * Check if stack switch is necessary
         */
        cmpwi   r2,0
        bne     nested
        mfspr   r1, SPRG1
 
nested:
        /*
         * Start Incrementing nesting level in R2
         */
        addi    r2,r2,1
        /*
         * Start Incrementing _Thread_Dispatch_disable_level R4 = _Thread_Dispatch_disable_level
         */
        lwz     r6,_Thread_Dispatch_disable_level@l(r15)
        /*
         * store new nesting level in SPRG0
         */
        mtspr   SPRG0, r2
 
        addi    r6, r6, 1
        mfmsr   r5
        /*
         * store new _Thread_Dispatch_disable_level value
         */
        stw     r6, _Thread_Dispatch_disable_level@l(r15)
        /*
         * We are now running on the interrupt stack. External and decrementer
         * exceptions are still disabled. I see no purpose trying to optimize
         * further assembler code.
         */
        /*
         * Call C exception handler for decrementer Interrupt frame is passed just
         * in case...
         */
        addi    r3, r14, 0x8
        bl      C_dispatch_irq_handler /* C_dispatch_irq_handler(cpu_interrupt_frame* r3, vector r4) */
        /*
         * start decrementing nesting level. Note : do not test result against 0
         * value as an easy exit condition because if interrupt nesting level > 1
         * then _Thread_Dispatch_disable_level > 1
         */
        mfspr   r2, SPRG0
        /*
         * start decrementing _Thread_Dispatch_disable_level
         */
        lwz     r3,_Thread_Dispatch_disable_level@l(r15)
        addi    r2, r2, -1      /* Continue decrementing nesting level */
        addi    r3, r3, -1      /* Continue decrementing _Thread_Dispatch_disable_level */
        mtspr   SPRG0, r2       /* End decrementing nesting level */
        stw     r3,_Thread_Dispatch_disable_level@l(r15) /* End decrementing _Thread_Dispatch_disable_level */
        cmpwi   r3, 0
        /*
         * switch back to original stack (done here just optimize registers
         * contention. Could have been done before...)
         */
        addi    r1, r14, 0
        bne     easy_exit /* if (_Thread_Dispatch_disable_level != 0) goto easy_exit */
        /*
         * Here we are running again on the thread system stack.
         * We have interrupt nesting level = _Thread_Dispatch_disable_level = 0.
         * Interrupt are still disabled. Time to check if scheduler request to
         * do something with the current thread...
         */
        addis   r4, 0, _Context_Switch_necessary@ha
        lwz     r5, _Context_Switch_necessary@l(r4)
        cmpwi   r5, 0
        bne     switch
 
        addis   r6, 0, _ISR_Signals_to_thread_executing@ha
        lwz     r7, _ISR_Signals_to_thread_executing@l(r6)
        cmpwi   r7, 0
        li      r8, 0
        beq     easy_exit
        stw     r8, _ISR_Signals_to_thread_executing@l(r6)
        /*
         * going to call _ThreadProcessSignalsFromIrq
         * Push a complete exception like frame...
         */
        stmw    r16, GPR16_OFFSET(r1)
        addi    r3, r1, 0x8
        /*
         * compute SP at exception entry
         */
        addi    r2, r1, EXCEPTION_FRAME_END
        /*
         * store it at the right place
         */
        stw     r2, GPR1_OFFSET(r1)
        /*
         * Call High Level signal handling code
         */
        bl      _ThreadProcessSignalsFromIrq
        /*
         * start restoring exception like frame
         */
        lwz     r31,  EXC_CTR_OFFSET(r1)
        lwz     r30,  EXC_XER_OFFSET(r1)
        lwz     r29,  EXC_CR_OFFSET(r1)
        lwz     r28,  EXC_LR_OFFSET(r1)
 
        mtctr   r31
        mtxer   r30
        mtcr    r29
        mtlr    r28
 
        lmw     r4, GPR4_OFFSET(r1)
        lwz     r2, GPR2_OFFSET(r1)
        lwz     r0, GPR0_OFFSET(r1)
 
        /*
         * Disable data and instruction translation. Make path non recoverable...
         */
        mfmsr   r3
        xori    r3, r3, MSR_RI | MSR_IR | MSR_DR
        mtmsr   r3
        SYNC
        /*
         * Restore rfi related settings
         */
 
        lwz     r3, SRR1_FRAME_OFFSET(r1)
        mtsrr1  r3
        lwz     r3, SRR0_FRAME_OFFSET(r1)
        mtsrr0  r3
 
        lwz     r3, GPR3_OFFSET(r1)
        addi    r1,r1, EXCEPTION_FRAME_END
        SYNC
        rfi
 
switch:
        bl      SYM (_Thread_Dispatch)
 
easy_exit:
        /*
         * start restoring interrupt frame
         */
        lwz     r3,  EXC_CTR_OFFSET(r1)
        lwz     r4,  EXC_XER_OFFSET(r1)
        lwz     r5,  EXC_CR_OFFSET(r1)
        lwz     r6,  EXC_LR_OFFSET(r1)
 
        mtctr   r3
        mtxer   r4
        mtcr    r5
        mtlr    r6
 
        lwz     r15, GPR15_OFFSET(r1)
        lwz     r14, GPR14_OFFSET(r1)
        lwz     r13, GPR13_OFFSET(r1)
        lwz     r12, GPR12_OFFSET(r1)
        lwz     r11, GPR11_OFFSET(r1)
        lwz     r10, GPR10_OFFSET(r1)
        lwz     r9, GPR9_OFFSET(r1)
        lwz     r8, GPR8_OFFSET(r1)
        lwz     r7, GPR7_OFFSET(r1)
        lwz     r6, GPR6_OFFSET(r1)
        lwz     r5, GPR5_OFFSET(r1)
 
        /*
         * Disable nested exception processing, data and instruction
         * translation.
         */
        mfmsr   r3
        xori    r3, r3, MSR_RI | MSR_IR | MSR_DR
        mtmsr   r3
        SYNC
        /*
         * Restore rfi related settings
         */
 
        lwz     r4, SRR1_FRAME_OFFSET(r1)
        lwz     r2, SRR0_FRAME_OFFSET(r1)
        lwz     r3, GPR3_OFFSET(r1)
        lwz     r0, GPR0_OFFSET(r1)
 
        mtsrr1  r4
        mtsrr0  r2
        lwz     r4, GPR4_OFFSET(r1)
        lwz     r2, GPR2_OFFSET(r1)
        addi    r1,r1, EXCEPTION_FRAME_END
        SYNC
        rfi
 

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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [powerpc/] [shared/] [irq/] [irq_asm.S] - Blame information for rev 562

Line No.	Rev	Author	Line
1	30	unneback	`/*`
2			`* This file contains the assembly code for the PowerPC`
3			`* IRQ veneers for RTEMS.`
4			`*`
5			`* The license and distribution terms for this file may be`
6			`* found in found in the file LICENSE in this distribution or at`
7			`* http://www.OARcorp.com/rtems/license.html.`
8			`*`
9			`* Modified to support the MCP750.`
10			`* Modifications Copyright (C) 1999 Eric Valette. valette@crf.canon.fr`
11			`*`
12			`*`
13			`* $Id: irq_asm.S,v 1.2 2001-09-27 12:01:06 chris Exp $`
14			`*/`
15
16			`#include`
17			`#include`
18			`#include`
19			`#include`
20			`#include "asm.h"`
21
22
23			`#define SYNC \`
24			`sync; \`
25			`isync`
26
27			`.text`
28			`.p2align 5`
29
30			`PUBLIC_VAR(decrementer_exception_vector_prolog_code)`
31
32			`SYM (decrementer_exception_vector_prolog_code):`
33			`/*`
34			`* let room for exception frame`
35			`*/`
36			`stwu r1, - (EXCEPTION_FRAME_END)(r1)`
37			`stw r4, GPR4_OFFSET(r1)`
38			`li r4, ASM_DEC_VECTOR`
39			`ba shared_raw_irq_code_entry`
40
41			`PUBLIC_VAR (decrementer_exception_vector_prolog_code_size)`
42
43			`decrementer_exception_vector_prolog_code_size = . - decrementer_exception_vector_prolog_code`
44
45			`PUBLIC_VAR(external_exception_vector_prolog_code)`
46
47			`SYM (external_exception_vector_prolog_code):`
48			`/*`
49			`* let room for exception frame`
50			`*/`
51			`stwu r1, - (EXCEPTION_FRAME_END)(r1)`
52			`stw r4, GPR4_OFFSET(r1)`
53			`li r4, ASM_EXT_VECTOR`
54			`ba shared_raw_irq_code_entry`
55
56			`PUBLIC_VAR (external_exception_vector_prolog_code_size)`
57
58			`external_exception_vector_prolog_code_size = . - external_exception_vector_prolog_code`
59
60			`PUBLIC_VAR(shared_raw_irq_code_entry)`
61			`PUBLIC_VAR(C_dispatch_irq_handler)`
62
63			`.p2align 5`
64			`SYM (shared_raw_irq_code_entry):`
65			`/*`
66			`* Entry conditions :`
67			`* Registers already saved : R1, R4`
68			`* R1 : points to a location with enough room for the`
69			`* interrupt frame`
70			`* R4 : vector number`
71			`*/`
72			`/*`
73			`* Save SRR0/SRR1 As soon As possible as it is the minimal needed`
74			`* to reenable exception processing`
75			`*/`
76			`stw r0, GPR0_OFFSET(r1)`
77			`stw r2, GPR2_OFFSET(r1)`
78			`stw r3, GPR3_OFFSET(r1)`
79
80			`mfsrr0 r0`
81			`mfsrr1 r2`
82			`mfmsr r3`
83
84			`stw r0, SRR0_FRAME_OFFSET(r1)`
85			`stw r2, SRR1_FRAME_OFFSET(r1)`
86			`/*`
87			`* Enable data and instruction address translation, exception recovery`
88			`*`
89			`* also, on CPUs with FP, enable FP so that FP context can be`
90			`* saved and restored (using FP instructions)`
91			`*/`
92			`#if (PPC_HAS_FPU == 0)`
93			`ori r3, r3, MSR_RI \| MSR_IR \| MSR_DR`
94			`#else`
95			`ori r3, r3, MSR_RI \| MSR_IR \| MSR_DR \| MSR_FP`
96			`#endif`
97			`mtmsr r3`
98			`SYNC`
99			`/*`
100			`* Push C scratch registers on the current stack. It may`
101			`* actually be the thread stack or the interrupt stack.`
102			`* Anyway we have to make it in order to be able to call C/C++`
103			`* functions. Depending on the nesting interrupt level, we will`
104			`* switch to the right stack later.`
105			`*/`
106			`stw r5, GPR5_OFFSET(r1)`
107			`stw r6, GPR6_OFFSET(r1)`
108			`stw r7, GPR7_OFFSET(r1)`
109			`stw r8, GPR8_OFFSET(r1)`
110			`stw r9, GPR9_OFFSET(r1)`
111			`stw r10, GPR10_OFFSET(r1)`
112			`stw r11, GPR11_OFFSET(r1)`
113			`stw r12, GPR12_OFFSET(r1)`
114			`stw r13, GPR13_OFFSET(r1)`
115
116			`mfcr r5`
117			`mfctr r6`
118			`mfxer r7`
119			`mflr r8`
120
121			`stw r5, EXC_CR_OFFSET(r1)`
122			`stw r6, EXC_CTR_OFFSET(r1)`
123			`stw r7, EXC_XER_OFFSET(r1)`
124			`stw r8, EXC_LR_OFFSET(r1)`
125
126			`/*`
127			`* Add some non volatile registers to store information`
128			`* that will be used when returning from C handler`
129			`*/`
130			`stw r14, GPR14_OFFSET(r1)`
131			`stw r15, GPR15_OFFSET(r1)`
132			`/*`
133			`* save current stack pointer location in R14`
134			`*/`
135			`addi r14, r1, 0`
136			`/*`
137			`* store part of _Thread_Dispatch_disable_level address in R15`
138			`*/`
139			`addis r15,0, _Thread_Dispatch_disable_level@ha`
140			`/*`
141			`* Get current nesting level in R2`
142			`*/`
143			`mfspr r2, SPRG0`
144			`/*`
145			`* Check if stack switch is necessary`
146			`*/`
147			`cmpwi r2,0`
148			`bne nested`
149			`mfspr r1, SPRG1`
150
151			`nested:`
152			`/*`
153			`* Start Incrementing nesting level in R2`
154			`*/`
155			`addi r2,r2,1`
156			`/*`
157			`* Start Incrementing _Thread_Dispatch_disable_level R4 = _Thread_Dispatch_disable_level`
158			`*/`
159			`lwz r6,_Thread_Dispatch_disable_level@l(r15)`
160			`/*`
161			`* store new nesting level in SPRG0`
162			`*/`
163			`mtspr SPRG0, r2`
164
165			`addi r6, r6, 1`
166			`mfmsr r5`
167			`/*`
168			`* store new _Thread_Dispatch_disable_level value`
169			`*/`
170			`stw r6, _Thread_Dispatch_disable_level@l(r15)`
171			`/*`
172			`* We are now running on the interrupt stack. External and decrementer`
173			`* exceptions are still disabled. I see no purpose trying to optimize`
174			`* further assembler code.`
175			`*/`
176			`/*`
177			`* Call C exception handler for decrementer Interrupt frame is passed just`
178			`* in case...`
179			`*/`
180			`addi r3, r14, 0x8`
181			`bl C_dispatch_irq_handler /* C_dispatch_irq_handler(cpu_interrupt_frame* r3, vector r4) */`
182			`/*`
183			`* start decrementing nesting level. Note : do not test result against 0`
184			`* value as an easy exit condition because if interrupt nesting level > 1`
185			`* then _Thread_Dispatch_disable_level > 1`
186			`*/`
187			`mfspr r2, SPRG0`
188			`/*`
189			`* start decrementing _Thread_Dispatch_disable_level`
190			`*/`
191			`lwz r3,_Thread_Dispatch_disable_level@l(r15)`
192			`addi r2, r2, -1 /* Continue decrementing nesting level */`
193			`addi r3, r3, -1 /* Continue decrementing _Thread_Dispatch_disable_level */`
194			`mtspr SPRG0, r2 /* End decrementing nesting level */`
195			`stw r3,_Thread_Dispatch_disable_level@l(r15) /* End decrementing _Thread_Dispatch_disable_level */`
196			`cmpwi r3, 0`
197			`/*`
198			`* switch back to original stack (done here just optimize registers`
199			`* contention. Could have been done before...)`
200			`*/`
201			`addi r1, r14, 0`
202			`bne easy_exit /* if (_Thread_Dispatch_disable_level != 0) goto easy_exit */`
203			`/*`
204			`* Here we are running again on the thread system stack.`
205			`* We have interrupt nesting level = _Thread_Dispatch_disable_level = 0.`
206			`* Interrupt are still disabled. Time to check if scheduler request to`
207			`* do something with the current thread...`
208			`*/`
209			`addis r4, 0, _Context_Switch_necessary@ha`
210			`lwz r5, _Context_Switch_necessary@l(r4)`
211			`cmpwi r5, 0`
212			`bne switch`
213
214			`addis r6, 0, _ISR_Signals_to_thread_executing@ha`
215			`lwz r7, _ISR_Signals_to_thread_executing@l(r6)`
216			`cmpwi r7, 0`
217			`li r8, 0`
218			`beq easy_exit`
219			`stw r8, _ISR_Signals_to_thread_executing@l(r6)`
220			`/*`
221			`* going to call _ThreadProcessSignalsFromIrq`
222			`* Push a complete exception like frame...`
223			`*/`
224			`stmw r16, GPR16_OFFSET(r1)`
225			`addi r3, r1, 0x8`
226			`/*`
227			`* compute SP at exception entry`
228			`*/`
229			`addi r2, r1, EXCEPTION_FRAME_END`
230			`/*`
231			`* store it at the right place`
232			`*/`
233			`stw r2, GPR1_OFFSET(r1)`
234			`/*`
235			`* Call High Level signal handling code`
236			`*/`
237			`bl _ThreadProcessSignalsFromIrq`
238			`/*`
239			`* start restoring exception like frame`
240			`*/`
241			`lwz r31, EXC_CTR_OFFSET(r1)`
242			`lwz r30, EXC_XER_OFFSET(r1)`
243			`lwz r29, EXC_CR_OFFSET(r1)`
244			`lwz r28, EXC_LR_OFFSET(r1)`
245
246			`mtctr r31`
247			`mtxer r30`
248			`mtcr r29`
249			`mtlr r28`
250
251			`lmw r4, GPR4_OFFSET(r1)`
252			`lwz r2, GPR2_OFFSET(r1)`
253			`lwz r0, GPR0_OFFSET(r1)`
254
255			`/*`
256			`* Disable data and instruction translation. Make path non recoverable...`
257			`*/`
258			`mfmsr r3`
259			`xori r3, r3, MSR_RI \| MSR_IR \| MSR_DR`
260			`mtmsr r3`
261			`SYNC`
262			`/*`
263			`* Restore rfi related settings`
264			`*/`
265
266			`lwz r3, SRR1_FRAME_OFFSET(r1)`
267			`mtsrr1 r3`
268			`lwz r3, SRR0_FRAME_OFFSET(r1)`
269			`mtsrr0 r3`
270
271			`lwz r3, GPR3_OFFSET(r1)`
272			`addi r1,r1, EXCEPTION_FRAME_END`
273			`SYNC`
274			`rfi`
275
276			`switch:`
277			`bl SYM (_Thread_Dispatch)`
278
279			`easy_exit:`
280			`/*`
281			`* start restoring interrupt frame`
282			`*/`
283			`lwz r3, EXC_CTR_OFFSET(r1)`
284			`lwz r4, EXC_XER_OFFSET(r1)`
285			`lwz r5, EXC_CR_OFFSET(r1)`
286			`lwz r6, EXC_LR_OFFSET(r1)`
287
288			`mtctr r3`
289			`mtxer r4`
290			`mtcr r5`
291			`mtlr r6`
292
293			`lwz r15, GPR15_OFFSET(r1)`
294			`lwz r14, GPR14_OFFSET(r1)`
295			`lwz r13, GPR13_OFFSET(r1)`
296			`lwz r12, GPR12_OFFSET(r1)`
297			`lwz r11, GPR11_OFFSET(r1)`
298			`lwz r10, GPR10_OFFSET(r1)`
299			`lwz r9, GPR9_OFFSET(r1)`
300			`lwz r8, GPR8_OFFSET(r1)`
301			`lwz r7, GPR7_OFFSET(r1)`
302			`lwz r6, GPR6_OFFSET(r1)`
303			`lwz r5, GPR5_OFFSET(r1)`
304
305			`/*`
306			`* Disable nested exception processing, data and instruction`
307			`* translation.`
308			`*/`
309			`mfmsr r3`
310			`xori r3, r3, MSR_RI \| MSR_IR \| MSR_DR`
311			`mtmsr r3`
312			`SYNC`
313			`/*`
314			`* Restore rfi related settings`
315			`*/`
316
317			`lwz r4, SRR1_FRAME_OFFSET(r1)`
318			`lwz r2, SRR0_FRAME_OFFSET(r1)`
319			`lwz r3, GPR3_OFFSET(r1)`
320			`lwz r0, GPR0_OFFSET(r1)`
321
322			`mtsrr1 r4`
323			`mtsrr0 r2`
324			`lwz r4, GPR4_OFFSET(r1)`
325			`lwz r2, GPR2_OFFSET(r1)`
326			`addi r1,r1, EXCEPTION_FRAME_END`
327			`SYNC`
328			`rfi`
329