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/*  cpu_asm.s

 *

 *  This file contains all assembly code for the Intel i386 implementation

 *  of RDBG.

 *

 * $Id: rdbg_cpu_asm.S,v 1.2 2001-09-27 12:02:02 chris Exp $

 *

 */

#include 

#include 

#include 

#include 

        BEGIN_CODE

/*

 *  void copyback_data_cache_and_invalidate_instr_cache(addr, size)

 *

 *  This routine performs a copy of the data cache

 *  and invalidate the instruction cache

 */

        .p2align  5

        PUBLIC_VAR (copyback_data_cache_and_invalidate_instr_cache)

SYM (copyback_data_cache_and_invalidate_instr_cache):

        /* make sure the data changed is in the cache */

        sync

        /* r3 address to handle, r4 length in bytes */

        addi    r6, r0, PPC_CACHE_ALIGNMENT

        /* r5 = last address to handle */

        add     r5,r3,r4

        /* r3 = cache_align(r3, PPC_CACHE_ALIGNMENT) */

        subi    r0,r6,1

        andc    r3,r3,r0

        /* R4 = R3 = copy of first address */

        mr      r4,r3

        /*

         * Copyback data cache

         */

1:      cmplw   r4,r5    /* r4 >= r5 then done */

        dcbst   0,r4     /* flush (data cache bloc store) */

        add     r4,r4,r6 /* r4 = next cache line addr */

        blt     1b       /* end r4 >= r5 then done */

        sync            /* Wait for all dcbst to complete on bus */

        /*

         * invalidate instruction cache

         */

        /* R4 = fisrt address */

        mr      r4,r3

2:      cmplw   r4,r5    /* r4 >= r5 then done */

        icbi    0,r4     /* invalidate (instruction cache bloc invalidate) */

        add     r4,r4,r6 /* r4 = next cache line addr */

        blt     2b       /* end r4 >= r5 then done */

        sync             /* Wait for all icbi to complete on bus */

        isync

        blr

/*

 * void enterRdbg(void)

 *

 * This function perform a call to the exception SYSTEM call

 * It is used :

 *   1 - in the user code, to simulate a Breakpoint.

 *       (with justSaveContext = 0)

 *   2 - in the RDBG code, to push a ctx in the list.

 *       (with justSaveContext = 1)

 *

 * In most of case, it will be use as described in 1.

 * The 2nd possibility will be used by RDBG to obtain

 * its own ctx

 */

        PUBLIC_VAR (enterRdbg)

SYM (enterRdbg):

        sc

        blr

END_CODE

END