source: trunk/softs/tests_cc_vcache/test_pte2sc_dirty/test.S @ 1015

/*
 * pte2d_ref: a sc to data should set the dirty bits in PTE
 */
#include <registers.h>
#include <misc.h>
#include <vcache.h>
        .text
        .globl  _start
_start:
        .set noreorder
        la      k0, TTY_BASE
        la      k1, EXIT_BASE

        PRINT(startstr)

        /* reset cop0 status (keep BEV) */
        lui     a0, 0x0040;
        mtc0    a0, COP0_STATUS

        la      a0, pte1_a
        srl     a0, a0, 13
        mtc2    a0, VC_PTPR
        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(mmustr)
        la      s0, pte2_a
        lw      s1, 0(s0) /* get PTE */
        move    a0, s1
        PRINTX
        PUTCHAR(' ')
        la      a1, (PTE2_L | PTE2_D)
        and     a0, s1, a1
        bne     a0, zero, fail /* PTE2_L or PTE2_D already set, not good */
        nop

        la      t0, testval + 0x00200000
        la      a1, MAGIC3
1:
        ll      a0, 0(t0)
        sc      a1, 0(t0); /* cause page to be referenced and dirty */
        beqz    a1, 1b
        nop

        lw      s1, 0(s0) /* get PTE */
        move    a0, s1
        PRINTX
        PUTCHAR(' ')
        la      a1, (PTE2_L | PTE2_D)
        and     a0, s1, a1
        bne     a0, a1, fail /* PTE2_L not set, not good */
        nop

        /* check again, using ll */
        ll      s1, 0(s0) /* get PTE */
        move    a0, s1
        PRINTX
        PUTCHAR('\n')
        la      a1, (PTE2_L | PTE2_D)
        and     a0, s1, a1
        bne     a0, a1, fail /* PTE2_L not set, not good */
        nop

        EXIT(0)
fail:
        /* we should not get there */
        EXIT(1)

        .globl excep
excep:
        .set noreorder
        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

        PUTCHAR('\n')
        /* we should get there */
        EXIT(0)

        .rodata:
statusstr: .ascii "status \0"
causestr: .ascii " cause \0"
pcstr: .ascii " pc \0"
badvastr: .ascii " badva \0"
mmustr: .ascii "mmu started \0"
startstr: .ascii "start\n\0"

        .org EXCEP_ADDRESS - BOOT_ADDRESS
        .globl evect
evect:
        j       excep
        nop

        .data
        /* first 2 pages is data that will be switched my mmu switch */
data_a:
        .word MAGIC1
testval:
        .word MAGIC2
        .globl pte2_a
/*
 * one PD with a level 2 PTP: we invalidate an entry in the PTP and
 * check that the VA is no longer accessible
 */
pte2_a:
        .align 12
        .word PTE2_V | PTE2_C | PTE2_X | PTE2_W
        .word 0x0000 >> 12 /* check real value of data_a */
        .org pte2_a + 4092
        .word 0
        .globl pte2_b
        .globl pte1_a
pte1_a:
        .align 13
        .word PTE1_V | PTE1_C | PTE1_W | 0x0 /* map PA 0 at VA 0 */
        .word PTE1_V | PTE1_T | (0x1000 >> 12) /* map PA 0x0 at VA 0x00200000 via pte2_a */
        .org pte1_a + (BOOT_ADDRESS >> 21) * 4
        .word PTE1_V | PTE1_C | PTE1_X | (BOOT_ADDRESS >> 21) /* map PA 0xbfc00000 at VA 0xbfc00000 */
        .org pte1_a + (TTY_BASE >> 21) * 4
        .word PTE1_V | PTE1_W | (TTY_BASE >> 21) /* map PA 0xd0200000 at VA 0xd0200000 */
        .org pte1_a + (EXIT_BASE >> 21) * 4
        .word PTE1_V | PTE1_W | (EXIT_BASE >> 21) /* map PA 0xe0000000 at VA 0xe0000000 */
        .org pte1_a + 8192