arch/mips/gt64120/ev64120/int-handler.S

   1 /*
   2  * int-handler.S
   3  *
   4  * Based on the cobalt handler.
   5  */
   6 #include <asm/asm.h>
   7 #include <asm/mipsregs.h>
   8 #include <asm/addrspace.h>
   9 #include <asm/regdef.h>
  10 #include <asm/stackframe.h>
  11
  12 /*
  13  * galileo_handle_int -
  14  *      We check for the timer first, then check PCI ints A and D.
  15  *      Then check for serial IRQ and fall through.
  16  */
  17                 .align  5
  18                 .set    reorder
  19                 .set    noat
  20                 NESTED(galileo_handle_int, PT_SIZE, sp)
  21                 SAVE_ALL
  22                 CLI
  23                 .set    at
  24                 mfc0    t0,CP0_CAUSE
  25                 mfc0    t2,CP0_STATUS
  26
  27                 and     t0,t2
  28
  29                 andi    t1,t0,STATUSF_IP4 /* int2 hardware line (timer) */
  30                 bnez    t1,ll_gt64120_irq
  31                 andi    t1,t0,STATUSF_IP2 /* int0 hardware line */
  32                 bnez    t1,ll_pci_intA
  33                 andi    t1,t0,STATUSF_IP5 /* int3 hardware line */
  34                 bnez    t1,ll_pci_intD
  35                 andi    t1,t0,STATUSF_IP6 /* int4 hardware line */
  36                 bnez    t1,ll_serial_irq
  37                 andi    t1,t0,STATUSF_IP7 /* compare int */
  38                 bnez    t1,ll_compare_irq
  39                 nop
  40
  41     /* wrong alarm or masked ... */
  42                 j       spurious_interrupt
  43                 nop
  44                 END(galileo_handle_int)
  45
  46
  47                 .align  5
  48                 .set    reorder
  49 ll_gt64120_irq:
  50                 li      a0,4
  51                 move    a1,sp
  52                 jal     do_IRQ
  53                 nop
  54                 j       ret_from_irq
  55                 nop
  56
  57                 .align  5
  58                 .set    reorder
  59 ll_compare_irq:
  60                 li      a0,7
  61                 move    a1,sp
  62                 jal     do_IRQ
  63                 nop
  64                 j       ret_from_irq
  65                 nop
  66
  67                 .align  5
  68                 .set    reorder
  69 ll_pci_intA:
  70                 move    a0,sp
  71                 jal     pci_intA
  72                 nop
  73                 j       ret_from_irq
  74                 nop
  75
  76 #if 0
  77                 .align  5
  78                 .set    reorder
  79 ll_pci_intB:
  80                 move    a0,sp
  81                 jal     pci_intB
  82                 nop
  83                 j       ret_from_irq
  84                 nop
  85
  86                 .align  5
  87                 .set    reorder
  88 ll_pci_intC:
  89                 move    a0,sp
  90                 jal     pci_intC
  91                 nop
  92                 j       ret_from_irq
  93                 nop
  94 #endif
  95
  96                 .align  5
  97                 .set    reorder
  98 ll_pci_intD:
  99                 move    a0,sp
 100                 jal     pci_intD
 101                 nop
 102                 j       ret_from_irq
 103                 nop
 104
 105                 .align  5
 106                 .set    reorder
 107 ll_serial_irq:
 108                 li      a0,6
 109                 move    a1,sp
 110                 jal     do_IRQ
 111                 nop
 112                 j       ret_from_irq
 113                 nop