diff options
Diffstat (limited to 'cpu/mpc85xx/start.S')
| -rw-r--r-- | cpu/mpc85xx/start.S | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/cpu/mpc85xx/start.S b/cpu/mpc85xx/start.S index 25d039056e..fc3c3368af 100644 --- a/cpu/mpc85xx/start.S +++ b/cpu/mpc85xx/start.S @@ -565,6 +565,7 @@ mck_return: /* Cache functions. */ +.globl invalidate_icache invalidate_icache: mfspr r0,L1CSR1 ori r0,r0,L1CSR1_ICFI @@ -574,6 +575,7 @@ invalidate_icache: isync blr /* entire I cache */ +.globl invalidate_dcache invalidate_dcache: mfspr r0,L1CSR0 ori r0,r0,L1CSR0_DCFI @@ -1019,3 +1021,50 @@ unlock_ram_in_cache: tlbivax 0,r3 isync blr + +.globl flush_dcache +flush_dcache: + mfspr r3,SPRN_L1CFG0 + + rlwinm r5,r3,9,3 /* Extract cache block size */ + twlgti r5,1 /* Only 32 and 64 byte cache blocks + * are currently defined. + */ + li r4,32 + subfic r6,r5,2 /* r6 = log2(1KiB / cache block size) - + * log2(number of ways) + */ + slw r5,r4,r5 /* r5 = cache block size */ + + rlwinm r7,r3,0,0xff /* Extract number of KiB in the cache */ + mulli r7,r7,13 /* An 8-way cache will require 13 + * loads per set. + */ + slw r7,r7,r6 + + /* save off HID0 and set DCFA */ + mfspr r8,SPRN_HID0 + ori r9,r8,HID0_DCFA@l + mtspr SPRN_HID0,r9 + isync + + lis r4,0 + mtctr r7 + +1: lwz r3,0(r4) /* Load... */ + add r4,r4,r5 + bdnz 1b + + msync + lis r4,0 + mtctr r7 + +1: dcbf 0,r4 /* ...and flush. */ + add r4,r4,r5 + bdnz 1b + + /* restore HID0 */ + mtspr SPRN_HID0,r8 + isync + + blr |