source: trunk/softs/tests_ccvcache_v4/test_interrupt_extended/test.S @ 232

/*
 * Check interrupt/return with interrup occuring at various points in
 * the software. Cache is enabled to we have on interrupt/cycle
 */
#include <registers.h>
#include <misc.h>
#include <vcache.h>
#include <xicu.h>

        .text
        .globl  _start
_start:
        .set noreorder
        la      k0, TTY_BASE
        la      k1, EXIT_BASE

        /* reset cause, make sure IV is off */
        mtc0    zero, COP0_CAUSE

        la      a0, pte1
        srl     a0, a0, 13
        mtc2    a0, VC_PTPR
        nop
        nop

        li      a0, VC_TLB_EN_ITLB | VC_TLB_EN_DTLB | VC_TLB_EN_ICACHE | VC_TLB_EN_DCACHE
        mtc2    a0, VC_TLB_EN

        PRINT(startstr)

        /* program xicu */
        la      t0, XICU_BASE
        /* clear pending interrupt */
        lw      a0, XICU_PTI_ACK(0)(t0)
        /* route PTI0 to irq 0 */
        li      a0, 1 << 0
        sw      a0, XICU_MSK_PTI_E(0)(t0)
        /* init s0 */
        li      s0, MAGIC2
        /*
         * interrupt in INTERRUPT_DELAY cycles.
         */
        li      a0, INTERRUPT_DELAY
        sw      a0, XICU_PTI_PER(0)(t0)
        /* clear pending interrupt */
        lw      a0, XICU_PTI_ACK(0)(t0)
        /* reset cop0 status (keep BEV), enable interrupt 0 */
        lui     a0, 0x0040;
        addiu   a0, 0x0401;
        mtc0    a0, COP0_STATUS

        li      s0, MAGIC1
        addiu   s0, s0, -1
        addiu   s0, s0, -1
        addiu   s0, s0, -1
        addiu   s0, s0, -1
        nop
        j       end
        addiu   s0, s0, 5
        nop
        /* we should not end there */
        EXIT(1)

end:
        PRINT(endstr)
        move    a0, s0
        PRINTX
        PUTCHAR('\n')
        EXIT(0)

        .globl excep
excep:
        .set noreorder
        /* disable timer0 */
        la      t0, XICU_BASE
        sw      zero, XICU_PTI_PER(0)(t0)
        PRINT(statusstr)
        mfc0    a0, COP0_STATUS
        PRINTX

        PRINT(causestr)
        mfc0    a0, COP0_CAUSE
        PRINTX

        PRINT(pcstr)
        mfc0    a0, COP0_EXPC
        PRINTX

        PRINT(badvastr)
        mfc0    a0, COP_0_BADVADDR
        PRINTX

        PRINT(xicustr)
        la      t0, XICU_BASE
        lw      a0, XICU_PRIO(0)(t0)
        PRINTX

        PUTCHAR('\n')
        /* clear interrupt */
        mfc0    a0, COP0_CAUSE
        andi    t0, a0, 0xff00
        xor     a0, a0, t0
        mtc0    a0, COP0_CAUSE
        eret
        /* we should not end there */
        EXIT(1)

        .rodata:
statusstr: .ascii "status \0"
causestr: .ascii " cause \0"
pcstr: .ascii " pc \0"
badvastr: .ascii " badva \0"
xicustr: .ascii " xicu \0"
startstr: .ascii "start\n\0"
endstr: .ascii "end \0"

        .org EXCEP_ADDRESS - BOOT_ADDRESS
        .globl evect
evect:
        j       excep
        nop
        .data
myvar:  .word 0
pte1:
        .align 13
        .word PTE1_V | PTE1_C | PTE1_W | 0x0 /* map PA 0 at VA 0 */
        .org pte1 + (BOOT_ADDRESS >> 21) * 4
        .word PTE1_V | PTE1_C | PTE1_X | (BOOT_ADDRESS >> 21) /* map PA 0xbfc00000 at VA 0xbfc00000 */
        .org pte1 + (TTY_BASE >> 21) * 4
        .word PTE1_V | PTE1_W | (TTY_BASE >> 21) /* map PA 0xd0200000 at VA 0xd0200000 */
        .org pte1 + (XICU_BASE >> 21) * 4
        .word PTE1_V | PTE1_W | (XICU_BASE >> 21) /* map PA 0xd2000000 at VA 0xd2000000 */
        .org pte1 + (EXIT_BASE >> 21) * 4
        .word PTE1_V | PTE1_W | (EXIT_BASE >> 21) /* map PA 0xe0000000 at VA 0xe0000000 */
        .org pte1 + 8192
        .word 0