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#include "../support/spr_defs.h"

        .extern _test
        .extern _test
        .global _main


.global _main
.global _buserr_except
.global _dpf_except
.global _ipf_except
.global _lpint_except
.global _align_except
.global _illegal_except
.global _hpint_except
.global _dtlbmiss_except
.global _itlbmiss_except
.global _range_except
.global _syscall_except
.global _res1_except
.global _trap_except
.global _res2_except

_buserr_except:
_dpf_except:
_ipf_except:
_align_except:
_illegal_except:
_dtlbmiss_except:
_itlbmiss_except:
_range_except:
_syscall_except:
_res1_except:
_trap_except:
_res2_except:

.org 0x0500
_lpint_except:
        l.nop
        l.nop
        
# clear TTMR[IP]
        l.addi r4,r0,SPR_TTMR
        l.movhi r5,hi(SPR_TTMR_RT | SPR_TTMR_IE)
        l.addi r5,r5,233
        l.mtspr r4,r5,0         # set TTMR

# clear entire PICSR
        l.movhi r4,hi(SPR_PICSR)
        l.addi r4,r0,lo(SPR_PICSR)
        l.addi r5,r0,0x0000
        l.mtspr r4,r5,0         # set PICSR

        l.nop
        l.rfe
        l.nop
        l.nop

.org 0x0800
_hpint_except:
        l.nop
        l.nop
        
# clear TTMR[IP]
        l.addi r4,r0,SPR_TTMR
        l.movhi r5,hi(SPR_TTMR_RT | SPR_TTMR_IE)
        l.addi r5,r5,233
        l.mtspr r4,r5,0         # set TTMR

# clear entire PICSR
        l.movhi r4,hi(SPR_PICSR)
        l.addi r4,r0,lo(SPR_PICSR)
        l.addi r5,r0,0x0000
        l.mtspr r4,r5,0         # set PICSR

        l.nop
        l.rfe
        l.nop
        l.nop


.org 0x2000

_main:
        l.nop
        l.nop

#
# set tick to generate an interrupt every, let say 329 cycles
#
        l.addi r4,r0,SPR_TTMR
        l.movhi r5,hi(SPR_TTMR_RT | SPR_TTMR_IE)
        l.addi r5,r5,329
        l.mtspr r4,r5,0         # set TTMR

#
# unmask all ints
#
        l.movhi r4,hi(SPR_PICMR)
        l.addi r4,r0,lo(SPR_PICMR)
        l.movhi r5,0xffff
        l.addi r5,r5,0xffff
        l.mtspr r4,r5,0         # set PICMR

#
# Enable exceptions and interrupts
#
        l.mfspr r5,r0,SPR_SR
        l.ori r5,r5,SPR_SR_SUPV|SPR_SR_EXR|SPR_SR_EIR
        l.mtspr r0,r5,SPR_SR    # set SR

#
# jump to main routine
#
        l.j _test
        l.nop