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/* Basic instruction set test */
#include "../support/spr_defs.h"

.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:
_lpint_except:
_align_except:
_illegal_except:
_hpint_except:
_dtlbmiss_except:
_range_except:
_syscall_except:
_res1_except:
_trap_except:
_res2_except:
        l.nop
        l.ori   r3,r0,0xeeee
        l.jal   _report
        l.nop
        l.jal   _exit
        l.nop

_ipf_except:
        // Valid entry 1, 1:1, full access
        l.addi  r14,r0,64
        l.movhi r5,hi(0x00002000|SPR_ITLBMR_V)
        l.ori   r5,r5,lo(0x00002000|SPR_ITLBMR_V)
        l.mtspr r0,r5,SPR_ITLBMR_BASE(0)+1
        l.movhi r5,hi(0x00002000|SPR_ITLBTR_SXE|SPR_ITLBTR_UXE)
        l.ori   r5,r5,lo(0x00002000|SPR_ITLBTR_SXE|SPR_ITLBTR_UXE)
        l.mtspr r0,r5,SPR_ITLBTR_BASE(0)+1
        l.rfe
        l.nop

_itlbmiss_except:
        // Valid entry 1, but no execute access
        l.addi  r13,r0,128
        l.movhi r5,hi(0x00002000|SPR_ITLBMR_V)
        l.ori   r5,r5,lo(0x00002000|SPR_ITLBMR_V)
        l.mtspr r0,r5,SPR_ITLBMR_BASE(0)+1
        l.ori   r5,r0,0
        l.mtspr r0,r5,SPR_ITLBTR_BASE(0)+1
        l.rfe
        l.nop

//
// r4, r5       - used by exception handlers
// r7, r8       - used by main for setting TLB
// r11          - accumulator of magic words
// r13, r14     - used ONLY by exception handlers for magic words

_main:
        l.nop
        l.addi  r11,r0,1
        
        // Valid entry 0, 1:1, full access
        l.movhi r5,hi(0x00000000|SPR_ITLBMR_V)
        l.ori   r5,r5,lo(0x00000000|SPR_ITLBMR_V)
        l.mtspr r0,r5,SPR_ITLBMR_BASE(0)
        l.movhi r5,hi(0x00000000|SPR_ITLBTR_UXE|SPR_ITLBTR_SXE)
        l.ori   r5,r5,lo(0x00000000|SPR_ITLBTR_UXE|SPR_ITLBTR_SXE)
        l.mtspr r0,r5,SPR_ITLBTR_BASE(0)

        // Invalidate entry 1
        l.movhi r7,hi(0x00002000)
        l.mtspr r0,r7,SPR_ITLBMR_BASE(0)+1
        l.ori   r7,r0,0
        l.mtspr r0,r7,SPR_ITLBTR_BASE(0)+1

        // Enable IMMU
        l.ori   r8,r0,SPR_SR_IME
        l.mfspr r7,r0,SPR_SR
        l.or    r7,r7,r8
        l.mtspr r0,r7,SPR_SR
        l.nop
        l.nop
        l.addi  r11,r11,16

        // Invoke ITLB miss and IPF exceptions
        l.jal   _immu_test
        l.addi  r11,r11,4

        // Some more magic words
        l.addi  r11,r11,8
        l.add   r11,r11,r13
        l.add   r11,r11,r14

        // Disable IMMU
        l.ori   r8,r0,SPR_SR_IME
        l.mfspr r7,r0,SPR_SR
        l.xor   r7,r7,r8
        l.mtspr r0,r7,SPR_SR
        l.nop

        // Exit
        l.nop
        l.movhi r12,hi(0xdeadde72)
        l.ori   r12,r12,lo(0xdeadde72)
        l.xor   r3,r11,r12
        l.jal   _report
        l.nop
        l.jal   _exit
        l.nop
        l.nop


.org 0x2000

_immu_test:
        l.addi  r11,r11,2
        l.jr    r9
        l.nop