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/*

Based upon IDT provided code with the following release:

This source code has been made available to you by IDT on an AS-IS
basis. Anyone receiving this source is licensed under IDT copyrights
to use it in any way he or she deems fit, including copying it,
modifying it, compiling it, and redistributing it either with or
without modifications.  No license under IDT patents or patent
applications is to be implied by the copyright license.

Any user of this software should understand that IDT cannot provide
technical support for this software and will not be responsible for
any consequences resulting from the use of this software.

Any person who transfers this source code or any derivative work must
include the IDT copyright notice, this paragraph, and the preceeding
two paragraphs in the transferred software.

COPYRIGHT IDT CORPORATION 1996
LICENSED MATERIAL - PROGRAM PROPERTY OF IDT

  $Id: idtmem.S,v 1.2 2001-09-27 12:00:25 chris Exp $

*/

/************************************************************************
**
**      idtmem.s - memory and cache functions
**
**      Copyright 1991 Integrated Device Technology, Inc.
**      All Rights Reserved
**
**************************************************************************/

/*
 * 950313: Ketan fixed bugs in mfc0/mtc0 hazards, and removed hack 
 * to set mem_size. 
 */

#include <iregdef.h>
#include <idtcpu.h>
#include <idtmon.h>

        .data
mem_size:
        .word   0        
dcache_size:
        .word   0                
icache_size:
#if defined(CPU_R3000)
        .word   MINCACHE        
#endif
#if defined(CPU_R4000)
        .word   0
#endif

#if defined(CPU_R4000)
        .data
scache_size:
        .word   0
icache_linesize:
        .word   0
dcache_linesize:
        .word   0
scache_linesize:
        .word   0
#endif


                .text

#if defined (CPU_R3000)
#define CONFIGFRM ((2*4)+4)     

/*************************************************************************
**
** Config_Dcache() -- determine size of Data cache 
**
**************************************************************************/

FRAME(config_Dcache,sp, CONFIGFRM, ra)
        .set    noreorder
        subu    sp,CONFIGFRM
        sw      ra,CONFIGFRM-4(sp)      /* save return address */
        sw      s0,4*4(sp)              /* save s0 in first regsave slot */
        mfc0    s0,C0_SR                /* save SR */
        nop
        mtc0    zero,C0_SR              /* disable interrupts */
        .set    reorder
        jal     _size_cache             /* returns Data cache size in v0 */
        sw      v0, dcache_size         /* save it */
        and     s0, ~SR_PE              /* do not clear PE */
        .set    noreorder
        mtc0    s0,C0_SR                /* restore SR */
        nop
        .set    reorder
        lw      s0, 4*4(sp)             /* restore s0 */
        lw      ra,CONFIGFRM-4(sp)      /* restore ra */
        addu    sp,CONFIGFRM            /* pop stack */
        j       ra
ENDFRAME(config_Dcache)
 

/*************************************************************************
**
** Config_Icache() -- determine size of Instruction cache
**                    MUST be run in uncached mode/handled in idt_csu.s
**
**************************************************************************/

FRAME(config_Icache,sp, CONFIGFRM, ra)
        .set    noreorder
        subu    sp,CONFIGFRM
        sw      ra,CONFIGFRM-4(sp)      /* save return address */
        sw      s0,4*4(sp)              /* save s0 in first regsave slot */
        mfc0    s0,C0_SR                /* save SR */
        nop
        mtc0    zero, C0_SR             /* disable interrupts */
        li      v0,SR_SWC               /* swap caches/disable ints  */
        mtc0    v0,C0_SR
        nop
        .set    reorder
        jal     _size_cache             /* returns instruction cache size */
        .set    noreorder
        mtc0    zero,C0_SR              /* swap back caches */  
        nop
        and     s0,~SR_PE               /* do not inadvertantly clear PE */
        mtc0    s0,C0_SR                /* restore SR */
        nop
        .set    reorder
        sw      v0, icache_size         /* save it AFTER caches back */
        lw      s0,4*4(sp)              /* restore s0 */
        lw      ra,CONFIGFRM-4(sp)      /* restore ra */
        addu    sp,CONFIGFRM            /* pop stack */
        j       ra
ENDFRAME(config_Icache)

/************************************************************************
**
** _size_cache()
** returns cache size in v0
**
************************************************************************/

FRAME(_size_cache,sp,0,ra)
        .set    noreorder
        mfc0    t0,C0_SR                /* save current sr */
        nop
        and     t0,~SR_PE               /* do not inadvertently clear PE */
        or      v0,t0,SR_ISC            /* isolate cache */
        mtc0    v0,C0_SR
        /*
         * First check if there is a cache there at all
         */
        move    v0,zero
        li      v1,0xa5a5a5a5           /* distinctive pattern */
        sw      v1,K0BASE               /* try to write into cache */
        lw      t1,K0BASE               /* try to read from cache */
        nop
        mfc0    t2,C0_SR
        nop
        .set    reorder
        and     t2,SR_CM
        bne     t2,zero,3f              /* cache miss, must be no cache */
        bne     v1,t1,3f                /* data not equal -> no cache */
        /*
         * Clear cache size boundries to known state.
         */
        li      v0,MINCACHE
1:
        sw      zero,K0BASE(v0)
        sll     v0,1
        ble     v0,MAXCACHE,1b

        li      v0,-1
        sw      v0,K0BASE(zero)         /* store marker in cache */
        li      v0,MINCACHE             /* MIN cache size */

2:      lw      v1,K0BASE(v0)           /* Look for marker */
        bne     v1,zero,3f              /* found marker */
        sll     v0,1                    /* cache size * 2 */
        ble     v0,MAXCACHE,2b          /* keep looking */
        move    v0,zero                 /* must be no cache */
        .set    noreorder
3:      mtc0    t0,C0_SR                /* restore sr */
        j       ra
        nop
ENDFRAME(_size_cache)
        .set    reorder


#define FLUSHFRM (2*4)

/***************************************************************************
**
** flush_Dcache() -  flush entire Data cache
**
****************************************************************************/
FRAME(flush_Dcache,sp,FLUSHFRM,ra)
        lw      t2, dcache_size         
        .set    noreorder
        mfc0    t3,C0_SR                /* save SR */
        nop
        and     t3,~SR_PE               /* dont inadvertently clear PE */
        beq     t2,zero,_Dflush_done    /* no D cache, get out! */
        nop
        li      v0, SR_ISC              /* isolate cache */
        mtc0    v0, C0_SR
        nop
        .set    reorder
        li      t0,K0BASE               /* set loop registers  */
        or      t1,t0,t2

2:      sb      zero,0(t0)
        sb      zero,4(t0)
        sb      zero,8(t0)
        sb      zero,12(t0)
        sb      zero,16(t0)
        sb      zero,20(t0)
        sb      zero,24(t0)
        addu    t0,32
        sb      zero,-4(t0)
        bne     t0,t1,2b

        .set    noreorder
_Dflush_done:
        mtc0    t3,C0_SR                /* restore Status Register */
        .set    reorder
        j       ra
ENDFRAME(flush_Dcache)


/***************************************************************************
**
** flush_Icache() -  flush entire Instruction cache
**
**      NOTE: Icache can only be flushed/cleared when uncached
**            Code forces into uncached memory regardless of calling mode
**
****************************************************************************/
FRAME(flush_Icache,sp,FLUSHFRM,ra)
        lw      t1,icache_size 
        .set    noreorder
        mfc0    t3,C0_SR                /* save SR */
        nop
        la      v0,1f
        li      v1,K1BASE
        or      v0,v1
        j       v0                      /* force into non-cached space */
        nop
1:
        and     t3,~SR_PE               /* dont inadvertently clear PE */
        beq     t1,zero,_Iflush_done    /* no i-cache get out */
        nop
        li      v0,SR_ISC|SR_SWC        /* disable intr, isolate and swap */
        mtc0    v0,C0_SR
        li      t0,K0BASE
        .set    reorder
        or      t1,t0,t1

1:      sb      zero,0(t0)
        sb      zero,4(t0)
        sb      zero,8(t0)
        sb      zero,12(t0)
        sb      zero,16(t0)
        sb      zero,20(t0)
        sb      zero,24(t0)
        addu    t0,32
        sb      zero,-4(t0)
        bne     t0,t1,1b
        .set    noreorder
_Iflush_done:
        mtc0    t3,C0_SR                /* un-isolate, enable interrupts */
        .set    reorder
        j       ra
ENDFRAME(flush_Icache)

/**************************************************************************
**
** clear_Dcache(base_addr, byte_count) - flush portion of Data cache
**
**      a0 = base address of portion to be cleared
**      a1 = byte count of length
**
***************************************************************************/
FRAME(clear_Dcache,sp,0,ra)

        lw      t2, dcache_size         /* Data cache size */
        .set    noreorder
        mfc0    t3,C0_SR                /* save SR */
        nop
        and     t3,~SR_PE               /* dont inadvertently clear PE */
        nop
        nop
        .set    reorder
        /*
         * flush data cache
         */

        .set    noreorder
        nop
        li      v0,SR_ISC               /* isolate data cache */
        mtc0    v0,C0_SR
        .set    reorder
        bltu    t2,a1,1f                /* cache is smaller than region */
        move    t2,a1
1:      addu    t2,a0                   /* ending address + 1 */
        move    t0,a0

1:      sb      zero,0(t0)
        sb      zero,4(t0)
        sb      zero,8(t0)
        sb      zero,12(t0)
        sb      zero,16(t0)
        sb      zero,20(t0)
        sb      zero,24(t0)
        addu    t0,32
        sb      zero,-4(t0)
        bltu    t0,t2,1b

        .set    noreorder
        mtc0    t3,C0_SR                /* un-isolate, enable interrupts */
        nop
        .set    reorder
        j       ra
ENDFRAME(clear_Dcache)


/**************************************************************************
**
** clear_Icache(base_addr, byte_count) - flush portion of Instruction cache
**
**      a0 = base address of portion to be cleared
**      a1 = byte count of length
**
**      NOTE: Icache can only be flushed/cleared when uncached
**            Code forces into uncached memory regardless of calling mode
**
***************************************************************************/
FRAME(clear_Icache,sp,0,ra)

        lw      t1, icache_size         /* Instruction cache size */
        /*
         * flush text cache
         */
        .set    noreorder
        mfc0    t3,C0_SR                /* save SR */
        nop 
        la      v0,1f
        li      v1,K1BASE
        or      v0,v1
        j       v0                      /* force into non-cached space */
        nop
1:
        and     t3,~SR_PE               /* dont inadvertently clear PE */
        nop
        nop
        li      v0,SR_ISC|SR_SWC        /* disable intr, isolate and swap */
        mtc0    v0,C0_SR
        .set    reorder
        bltu    t1,a1,1f                /* cache is smaller than region */
        move    t1,a1
1:      addu    t1,a0                   /* ending address + 1 */
        move    t0,a0

        sb      zero,0(t0)
        sb      zero,4(t0)
        sb      zero,8(t0)
        sb      zero,12(t0)
        sb      zero,16(t0)
        sb      zero,20(t0)
        sb      zero,24(t0)
        addu    t0,32
        sb      zero,-4(t0)
        bltu    t0,t1,1b
        .set    noreorder
        mtc0    t3,C0_SR                /* un-isolate, enable interrupts */
        nop
        nop
        nop                             /* allow time for caches to swap */
        .set    reorder
        j       ra
ENDFRAME(clear_Icache)


/**************************************************************************
**
**  get_mem_conf - get memory configuration 
**
***************************************************************************/


FRAME(get_mem_conf,sp,0,ra)

        lw      t6, mem_size
        sw      t6, 0(a0)
        lw      t7, icache_size
        sw      t7, 4(a0)
        lw      t8, dcache_size
        sw      t8, 8(a0) 
        j       ra

ENDFRAME(get_mem_conf)
#endif /* defined CPU_R3000 */

#if defined(CPU_R4000)
#define LEAF(label)     FRAME(label,sp,0,ra)
#define XLEAF(label) \
        .globl label ; \
label:
#define END(label)      ENDFRAME(label)

/*
 * cacheop macro to automate cache operations
 * first some helpers...
 */
#define _mincache(size, maxsize) \
        bltu    size,maxsize,8f ;       \
        move    size,maxsize ;          \
8:

#define _align(tmp, minaddr, maxaddr, linesize) \
        subu    tmp,linesize,1 ;        \
        not     tmp ;                   \
        and     minaddr,tmp ;           \
        addu    maxaddr,-1 ;            \
        and     maxaddr,tmp

/* This is a bit of a hack really because it relies on minaddr=a0 */
#define _doop1(op1) \
        cache   op1,0(a0) 

#define _doop2(op1, op2) \
        cache   op1,0(a0) ;             \
        cache   op2,0(a0) 

/* specials for cache initialisation */
#define _doop1lw1(op1) \
        cache   op1,0(a0) ;             \
        lw      zero,0(a0) ;            \
        cache   op1,0(a0) 

#define _doop121(op1,op2) \
        cache   op1,0(a0) ;             \
        nop;                            \
        cache   op2,0(a0) ;             \
        nop;                            \
        cache   op1,0(a0) 

#define _oploopn(minaddr, maxaddr, linesize, tag, ops) \
        .set    noreorder ;             \
7:      _doop##tag##ops ;               \
        bne     minaddr,maxaddr,7b ;    \
        addu    minaddr,linesize ;      \
        .set    reorder

/* finally the cache operation macros */
#define icacheopn(kva, n, cache_size, cache_linesize, tag, ops) \
        _mincache(n, cache_size);       \
        blez    n,9f ;                  \
        addu    n,kva ;                 \
        _align(t1, kva, n, cache_linesize) ; \
        _oploopn(kva, n, cache_linesize, tag, ops) ; \
9:

#define vcacheopn(kva, n, cache_size, cache_linesize, tag, ops) \
        blez    n,9f ;                  \
        addu    n,kva ;                 \
        _align(t1, kva, n, cache_linesize) ; \
        _oploopn(kva, n, cache_linesize, tag, ops) ; \
9:

#define icacheop(kva, n, cache_size, cache_linesize, op) \
        icacheopn(kva, n, cache_size, cache_linesize, 1, (op))

#define vcacheop(kva, n, cache_size, cache_linesize, op) \
        vcacheopn(kva, n, cache_size, cache_linesize, 1, (op))

        .text

/*
 * static void _size_cache()    R4000
 * 
 * Internal routine to determine cache sizes by looking at R4000 config
 * register.  Sizes are returned in registers, as follows:
 *      t2      icache size
 *      t3      dcache size
 *      t6      scache size
 *      t4      icache line size
 *      t5      dcache line size
 *      t7      scache line size
 */
LEAF(_size_cache)
        mfc0    t0,C0_CONFIG

        and     t1,t0,CFG_ICMASK
        srl     t1,CFG_ICSHIFT
        li      t2,0x1000
        sll     t2,t1

        and     t1,t0,CFG_DCMASK
        srl     t1,CFG_DCSHIFT
        li      t3,0x1000
        sll     t3,t1

        li      t4,32
        and     t1,t0,CFG_IB
        bnez    t1,1f
        li      t4,16
1:      

        li      t5,32
        and     t1,t0,CFG_DB
        bnez    t1,1f
        li      t5,16
1:      

        move    t6,zero                 # default to no scache
        move    t7,zero                 #

        and     t1,t0,CFG_C_UNCACHED    # test config register
        bnez    t1,1f                   # no scache if uncached/non-coherent
        
        li      t6,0x100000             # assume 1Mb scache <<-NOTE
        and     t1,t0,CFG_SBMASK
        srl     t1,CFG_SBSHIFT
        li      t7,16
        sll     t7,t1
1:      j       ra
END(_size_cache)


/*
 * void config_cache()   R4000
 * 
 * Work out size of I, D & S caches, assuming they are already initialised.
 */
LEAF(config_cache)
        lw      t0,icache_size
        bgtz    t0,8f                   # already known?
        move    v0,ra
        bal     _size_cache
        move    ra,v0

        sw      t2,icache_size
        sw      t3,dcache_size
        sw      t6,scache_size
        sw      t4,icache_linesize
        sw      t5,dcache_linesize
        sw      t7,scache_linesize
8:      j       ra
END(config_cache)


/*
 * void _init_cache()   R4000
 */
LEAF(_init_cache)
        /*
         * First work out the sizes
         */
        move    v0,ra
        bal     _size_cache
        move    ra,v0
        
        /*
         * The caches may be in an indeterminate state,
         * so we force good parity into them by doing an
         * invalidate, load/fill, invalidate for each line.
         */

        /* disable all i/u and cache exceptions */
        mfc0    v0,C0_SR
        and     v1,v0,~SR_IE
        or      v1,SR_DE
        mtc0    v1,C0_SR

        mtc0    zero,C0_TAGLO
        mtc0    zero,C0_TAGHI

        /* assume bottom of RAM will generate good parity for the cache */
        li      a0,PHYS_TO_K0(0)
        move    a2,t2           # icache_size
        move    a3,t4           # icache_linesize
        move    a1,a2
        icacheopn(a0,a1,a2,a3,121,(Index_Store_Tag_I,Fill_I))

        li      a0,PHYS_TO_K0(0)
        move    a2,t3           # dcache_size
        move    a3,t5           # dcache_linesize
        move    a1,a2
        icacheopn(a0,a1,a2,a3,1lw1,(Index_Store_Tag_D))

        /* assume unified I & D in scache <<-NOTE */
        blez    t6,1f
        li      a0,PHYS_TO_K0(0)
        move    a2,t6
        move    a3,t7
        move    a1,a2
        icacheopn(a0,a1,a2,a3,1lw1,(Index_Store_Tag_SD))

1:      mtc0    v0,C0_SR
        j       ra
END(_init_cache)
        

/*
 * void flush_cache (void)   R4000
 *
 * Flush and invalidate all caches
 */
LEAF(flush_cache)
        /* secondary cacheops do all the work if present */
        lw      a2,scache_size
        blez    a2,1f
        lw      a3,scache_linesize
        li      a0,PHYS_TO_K0(0)
        move    a1,a2
        icacheop(a0,a1,a2,a3,Index_Writeback_Inv_SD)
        b       2f

1:      
        lw      a2,icache_size
        blez    a2,2f
        lw      a3,icache_linesize
        li      a0,PHYS_TO_K0(0)
        move    a1,a2
        icacheop(a0,a1,a2,a3,Index_Invalidate_I)

        lw      a2,dcache_size
        lw      a3,dcache_linesize
        li      a0,PHYS_TO_K0(0)
        move    a1,a2
        icacheop(a0,a1,a2,a3,Index_Writeback_Inv_D)

2:      j       ra
END(flush_cache)
        
/*
 * void flush_cache_nowrite (void)   R4000
 *
 * Invalidate all caches
 */
LEAF(flush_cache_nowrite)
        mfc0    v0,C0_SR
        and     v1,v0,~SR_IE
        mtc0    v1,C0_SR

        mtc0    zero,C0_TAGLO
        mtc0    zero,C0_TAGHI

        lw      a2,icache_size
        blez    a2,2f
        lw      a3,icache_linesize
        li      a0,PHYS_TO_K0(0)
        move    a1,a2
        icacheop(a0,a1,a2,a3,Index_Invalidate_I)

        lw      a2,dcache_size
        lw      a3,dcache_linesize
        li      a0,PHYS_TO_K0(0)
        move    a1,a2
        icacheop(a0,a1,a2,a3,Index_Store_Tag_D)

        lw      a2,scache_size
        blez    a2,2f
        lw      a3,scache_linesize
        li      a0,PHYS_TO_K0(0)
        move    a1,a2
        icacheop(a0,a1,a2,a3,Index_Store_Tag_SD)

2:      mtc0    v0,C0_SR
        j       ra
END(flush_cache_nowrite)
        
/*
 * void clean_cache (unsigned kva, size_t n)   R4000
 *
 * Writeback and invalidate address range in all caches
 */
LEAF(clean_cache)
XLEAF(clear_cache)

        /* secondary cacheops do all the work (if fitted) */
        lw      a2,scache_size
        blez    a2,1f
        lw      a3,scache_linesize
        vcacheop(a0,a1,a2,a3,Hit_Writeback_Inv_SD)
        b       2f

1:      lw      a2,icache_size
        blez    a2,2f
        lw      a3,icache_linesize
        /* save kva & n for subsequent loop */
        move    t8,a0
        move    t9,a1
        vcacheop(a0,a1,a2,a3,Hit_Invalidate_I)

        lw      a2,dcache_size
        lw      a3,dcache_linesize
        /* restore kva & n */
        move    a0,t8
        move    a1,t9
        vcacheop(a0,a1,a2,a3,Hit_Writeback_Inv_D)

2:      j       ra
END(clean_cache)
        
/*
 * void clean_dcache (unsigned kva, size_t n)   R4000
 *
 * Writeback and invalidate address range in primary data cache
 */
LEAF(clean_dcache)
        lw      a2,dcache_size
        blez    a2,2f
        lw      a3,dcache_linesize

        vcacheop(a0,a1,a2,a3,Hit_Writeback_Inv_D)

2:      j       ra
END(clean_dcache)
        
/*
 * void clean_dcache_indexed (unsigned kva, size_t n)   R4000
 *
 * Writeback and invalidate indexed range in primary data cache
 */
LEAF(clean_dcache_indexed)
        lw      a2,dcache_size
        blez    a2,2f
        lw      a3,dcache_linesize

#ifdef CPU_ORION
        srl     a2,1                    # do one set (half cache) at a time
        move    t8,a0                   # save kva & n
        move    t9,a1
        icacheop(a0,a1,a2,a3,Index_Writeback_Inv_D)

        addu    a0,t8,a2                # do next set
        move    a1,t9                   # restore n
#endif
        icacheop(a0,a1,a2,a3,Index_Writeback_Inv_D)

2:      j       ra
END(clean_dcache_indexed)
        
/*
 * void clean_dcache_nowrite (unsigned kva, size_t n)   R4000
 *
 * Invalidate an address range in primary data cache
 */
LEAF(clean_dcache_nowrite)
        lw      a2,dcache_size
        blez    a2,2f
        lw      a3,dcache_linesize

        vcacheop(a0,a1,a2,a3,Hit_Invalidate_D)

2:      j       ra
END(clean_dcache_nowrite)
        
/*
 * void clean_dcache_nowrite_indexed (unsigned kva, size_t n)   R4000
 *
 * Invalidate indexed range in primary data cache
 */
LEAF(clean_dcache_nowrite_indexed)
        mfc0    v0,C0_SR
        and     v1,v0,~SR_IE
        mtc0    v1,C0_SR

        mtc0    zero,C0_TAGLO
        mtc0    zero,C0_TAGHI

        lw      a2,dcache_size
        blez    a2,2f
        lw      a3,dcache_linesize

#ifdef CPU_ORION
        srl     a2,1                    # do one set (half cache) at a time
        move    t8,a0                   # save kva & n
        move    t9,a1
        icacheop(a0,a1,a2,a3,Index_Store_Tag_D)

        addu    a0,t8,a2                # do next set
        move    a1,t9                   # restore n
#endif
        icacheop(a0,a1,a2,a3,Index_Store_Tag_D)

2:      mtc0    v0,C0_SR
        j       ra
END(clean_dcache_nowrite_indexed)
        
/*
 * void clean_icache (unsigned kva, size_t n)   R4000
 *
 * Invalidate address range in primary instruction cache
 */
LEAF(clean_icache)
        lw      a2,icache_size
        blez    a2,2f
        lw      a3,icache_linesize

        vcacheop(a0,a1,a2,a3,Hit_Invalidate_I)

2:      j       ra
END(clean_icache)
        
/*
 * void clean_icache_indexed (unsigned kva, size_t n)   R4000
 *
 * Invalidate indexed range in primary instruction cache
 */
LEAF(clean_icache_indexed)
        lw      a2,icache_size
        blez    a2,2f
        lw      a3,icache_linesize

#ifdef CPU_ORION
        srl     a2,1                    # do one set (half cache) at a time
        move    t8,a0                   # save kva & n
        move    t9,a1
        icacheop(a0,a1,a2,a3,Index_Invalidate_I)

        addu    a0,t8,a2                # do next set
        move    a1,t9                   # restore n
#endif
        icacheop(a0,a1,a2,a3,Index_Invalidate_I)

2:      j       ra
END(clean_icache_indexed)
        


/*
 * void clean_scache (unsigned kva, size_t n)   R4000
 *
 * Writeback and invalidate address range in secondary cache
 */
LEAF(clean_scache)
        lw      a2,scache_size
        blez    a2,2f
        lw      a3,scache_linesize
        vcacheop(a0,a1,a2,a3,Hit_Writeback_Inv_SD)

2:      j       ra
END(clean_scache)
        
/*
 * void clean_scache_indexed (unsigned kva, size_t n)   R4000
 *
 * Writeback and invalidate indexed range in secondary cache
 */
LEAF(clean_scache_indexed)
        lw      a2,scache_size
        blez    a2,2f
        lw      a3,scache_linesize

        icacheop(a0,a1,a2,a3,Index_Writeback_Inv_SD)

2:      j       ra
END(clean_scache_indexed)
        
/*
 * void clean_scache_nowrite (unsigned kva, size_t n)   R4000
 *
 * Invalidate an address range in secondary cache
 */
LEAF(clean_scache_nowrite)
        lw      a2,scache_size
        blez    a2,2f
        lw      a3,scache_linesize

        vcacheop(a0,a1,a2,a3,Hit_Invalidate_SD)

2:      j       ra
END(clean_scache_nowrite)
        
/*
 * void clean_scache_nowrite_indexed (unsigned kva, size_t n)   R4000
 *
 * Invalidate indexed range in secondary cache
 */
LEAF(clean_scache_nowrite_indexed)
        mfc0    v0,C0_SR
        and     v1,v0,~SR_IE
        mtc0    v1,C0_SR

        mtc0    zero,C0_TAGLO
        mtc0    zero,C0_TAGHI

        lw      a2,scache_size
        blez    a2,2f
        lw      a3,scache_linesize

        icacheop(a0,a1,a2,a3,Index_Store_Tag_SD)

2:      mtc0    v0,C0_SR
        j       ra
END(clean_scache_nowrite_indexed)
        
/**************************************************************************
**
**  get_mem_conf - get memory configuration  R4000
**
***************************************************************************/


FRAME(get_mem_conf,sp,0,ra)

        lw      t6, mem_size
        sw      t6, 0(a0)
        lw      t7, icache_size
        sw      t7, 4(a0)
        lw      t8, dcache_size
        sw      t8, 8(a0) 
        lw      t7, scache_size
        sw      t7, 12(a0) 
        j       ra

ENDFRAME(get_mem_conf)

#endif /* defined(CPU_R4000) */

/*
 * void set_mem_size (mem_size) 
 *
 * config_memory()'s memory size gets written into mem_size here.
 * Now we don't need to call config_cache() with memory size - New to IDTC6.0
 */
FRAME(set_memory_size,sp,0,ra)
        sw      a0, mem_size
        j       ra
ENDFRAME(set_memory_size)