1 /**************************************
3 * copyright @ Motorola, 1999
5 **************************************/
7 #include <ppc_asm.tmpl>
9 #include <asm/processor.h>
11 /*********************************************
12 * function: CoreExtIntEnable
14 * description: Enable 603e core external interrupt
16 * note: mtmsr is context-synchronization
17 **********************************************/
20 .global CoreExtIntEnable
24 ori r3,r3,0x8000 /* enable external interrupt */
29 /*******************************************
30 * function: CoreExtIntDisable
32 * description: Disable 603e core external interrupt
35 *******************************************/
38 .global CoreExtIntDisable
46 andi. r3,r3,0x7fff /* disable external interrupt */
53 /*********************************************************
56 * description: signal the EOI and restore machine status
57 * Input: r3 - value of eumbbar
58 * Output: r3 - value of eumbbar
59 * r4 - ISR vector value
61 ********************************************************/
66 lis r5,0x0006 /* Build End Of Interrupt Register offset */
68 xor r7,r7,r7 /* Clear r7 */
69 stwbrx r7,r5,r3 /* Save r7, writing to this register will
70 * intidate the end of processing the
75 /* ---RESTORE MACHINE STATE */
76 mfmsr r13 /* Clear Recoverable Interrupt bit in MSR */
80 andi. r13,r13,0x7ffd /* (and disable interrupts) */
84 lwz r13,0x1c(r1) /* pull ctr */
87 lwz r13,0x18(r1) /* pull xer */
90 lwz r13,0x14(r1) /* pull lr */
93 lwz r13,0x10(r1) /* Pull SRR1 from stack */
94 mtspr SRR1,r13 /* Restore SRR1 */
96 lwz r13,0xc(r1) /* Pull SRR0 from stack */
97 mtspr SRR0,r13 /* Restore SRR0 */
99 lwz r13,0x8(r1) /* Pull User stack pointer from stack */
100 mtspr SPRG1,r13 /* Restore SPRG1 */
102 lwz r4,0x4(r1) /* vector value */
103 lwz r3,0x0(r1) /* eumbbar */
106 addi r1,r1,0x20 /* Deallocate stack */
107 mtspr SPRG0,r1 /* Save updated Supervisor stack pointer */
108 mfspr r1,SPRG1 /* Restore User stack pointer */
112 /***********************************************************
113 * function: exception routine called by exception vector
114 * at 0x500, external interrupt
116 * description: Kahlua EPIC controller
118 * input: r3 - content of eumbbar
119 * output: r3 - ISR return value
120 * r4 - Interrupt vector number
122 ***********************************************************/
126 .global epic_exception
130 /*---SAVE MACHINE STATE TO A STACK */
131 mtspr SPRG1,r1 /* Save User stack pointer to SPRG1 */
132 mfspr r1,SPRG0 /* Load Supervisor stack pointer into r1 */
134 stwu r3,-0x20(r1) /* Push the value of eumbbar onto stack */
136 mfspr r3,SPRG1 /* Push User stack pointer onto stack */
138 mfspr r3,SRR0 /* Push SRR0 onto stack */
140 mfspr r3,SRR1 /* Push SRR1 onto stack */
143 stw r3,0x14(r1) /* Push LR */
145 stw r3,0x18(r1) /* Push Xer */
147 stw r3,0x1c(r1) /* Push CTR */
149 mtspr SPRG0,r1 /* Save updated Supervisor stack pointer
153 ori r3,r3,0x0002 /* Set Recoverable Interrupt bit in MSR */
156 /* ---READ IN THE EUMBAR REGISTER */
157 lwz r6,0(r1) /* this is eumbbar */
160 /* ---READ EPIC REGISTER: PROCESSOR INTERRUPT ACKNOWLEDGE REGISTER */
161 lis r5,0x0006 /* Build Interrupt Acknowledge Register
165 lwbrx r7,r5,r6 /* Load interrupt vector into r7 */
168 /* --MASK OFF ALL BITS EXCEPT THE VECTOR */
171 or r3, r3, r6 /* eumbbar in r3 */
172 andi. r4,r7,0x00ff /* Mask off bits, vector in r4 */
174 stw r4,0x04(r1) /* save the vector value */
182 or r30,r30,r3 /* save the r3 which containts the return value from epicISR */
184 /* ---READ IN THE EUMBAR REGISTER */
194 or r3,r3,r30 /* restore the ISR return value */