diff options
Diffstat (limited to 'arch/ppc/kernel/misc.S')
| -rw-r--r-- | arch/ppc/kernel/misc.S | 57 |
1 files changed, 51 insertions, 6 deletions
diff --git a/arch/ppc/kernel/misc.S b/arch/ppc/kernel/misc.S index fde7112c7..50f63eeb4 100644 --- a/arch/ppc/kernel/misc.S +++ b/arch/ppc/kernel/misc.S @@ -229,7 +229,7 @@ _GLOBAL(flush_dcache_range) blr /* - * Flush a particular page from the DATA cache + * Flush a particular page from the data cache to RAM. * Note: this is necessary because the instruction cache does *not* * snoop from the data cache. * This is a no-op on the 601 which has a unified cache. @@ -241,18 +241,31 @@ _GLOBAL(__flush_page_to_ram) rlwinm r5,r5,16,16,31 cmpi 0,r5,1 beqlr /* for 601, do nothing */ - li r4,0x0FFF - andc r3,r3,r4 /* Get page base address */ li r4,4096/CACHE_LINE_SIZE /* Number of lines in a page */ mtctr r4 - mr r6,r3 0: dcbst 0,r3 /* Write line to ram */ addi r3,r3,CACHE_LINE_SIZE bdnz 0b sync + blr + +/* + * Flush a particular page from the instruction cache. + * Note: this is necessary because the instruction cache does *not* + * snoop from the data cache. + * This is a no-op on the 601 which has a unified cache. + * + * void __flush_icache_page(void *page) + */ +_GLOBAL(__flush_icache_page) + mfspr r5,PVR + rlwinm r5,r5,16,16,31 + cmpi 0,r5,1 + beqlr /* for 601, do nothing */ + li r4,4096/CACHE_LINE_SIZE /* Number of lines in a page */ mtctr r4 -1: icbi 0,r6 - addi r6,r6,CACHE_LINE_SIZE +1: icbi 0,r3 + addi r3,r3,CACHE_LINE_SIZE bdnz 1b sync isync @@ -272,6 +285,38 @@ _GLOBAL(clear_page) blr /* + * Copy a whole page. We use the dcbz instruction on the destination + * to reduce memory traffic (it eliminates the unnecessary reads of + * the destination into cache). This requires that the destination + * is cacheable. + */ +_GLOBAL(copy_page) + li r0,4096/CACHE_LINE_SIZE + mtctr r0 + addi r3,r3,-4 + addi r4,r4,-4 + li r5,4 +1: dcbz r5,r3 + lwz r6,4(r4) + lwz r7,8(r4) + lwz r8,12(r4) + lwzu r9,16(r4) + stw r6,4(r3) + stw r7,8(r3) + stw r8,12(r3) + stwu r9,16(r3) + lwz r6,4(r4) + lwz r7,8(r4) + lwz r8,12(r4) + lwzu r9,16(r4) + stw r6,4(r3) + stw r7,8(r3) + stw r8,12(r3) + stwu r9,16(r3) + bdnz 1b + blr + +/* * Atomic [test&set] exchange * * unsigned long xchg_u32(void *ptr, unsigned long val) |