How about adding new xxx_dcache_range() functions functions to PPC.
Below is my suggestion which is more logical and more efficient:
static inline void invalidate_dcache_region(void *adr, unsigned long len)
{
if(len == 0) return;
len = ((len-1) >> LG_L1_CACHE_LINE_SIZE) +1;
do {
asm ("dcbi 0,%0" : : "r" (adr));
adr += L1_CACHE_LINE_SIZE;
} while(--len > 0);
}
static inline void clean_dcache_region(void *adr, unsigned long len)
{
if(len == 0) return;
len = ((len-1) >> LG_L1_CACHE_LINE_SIZE) +1;
do {
asm ("dcbst 0,%0" : : "r" (adr));
adr += L1_CACHE_LINE_SIZE;
} while(--len > 0);
asm ("sync" : : );
}
static inline void flush_dcache_region(void *adr, unsigned long len)
{
if(len == 0) return;
len = ((len-1) >> LG_L1_CACHE_LINE_SIZE) +1;
do {
asm ("dcbf 0,%0" : : "r" (adr));
adr += L1_CACHE_LINE_SIZE;
} while(--len > 0);
asm ("sync" : : );
}
int *ptr1;
char *ptr2;
void *ptr3;
main()
{
unsigned long len1 = 1600;
unsigned long len2 = 900;
unsigned long len3 = 702;
invalidate_dcache_region(ptr1, len1);
clean_dcache_region(ptr2, len2);
flush_dcache_region(ptr3, len3);
}
/* Assembler output:
ppc_8xx-gcc -O2 -S inv_dcache.c -mregnames inv_dcache.c
.file "inv_dcache.c"
gcc2_compiled.:
.section ".text"
.align 2
.globl main
.type main, at function
main:
li %r0,100
mtctr %r0
lis %r9,ptr1 at ha
lwz %r9,ptr1 at l(%r9)
.L39:
dcbi 0,%r9
addi %r9,%r9,16
bdnz .L39
li %r0,57
mtctr %r0
lis %r9,ptr2 at ha
lwz %r9,ptr2 at l(%r9)
.L30:
dcbst 0,%r9
addi %r9,%r9,16
bdnz .L30
sync
li %r0,44
mtctr %r0
lis %r9,ptr3 at ha
lwz %r9,ptr3 at l(%r9)
.L36:
dcbf 0,%r9
addi %r9,%r9,16
bdnz .L36
sync
blr
.Lfe1:
.size main,.Lfe1-main
.comm ptr1,4,4
.comm ptr2,4,4
.comm ptr3,4,4
.ident "GCC: (GNU) 2.95.3 20010315 (release/MontaVista)"
*/
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