diff options
| author |   Bernd Schmidt <bernds_cb1@t-online.de> | 2008-04-23 07:26:23 +0800 |
|---|---|---|
| committer |   Bryan Wu <cooloney@kernel.org> | 2008-04-23 07:26:23 +0800 |
| commit | b4bb68f7d049e923a812903133e7e3747dfe0fce (patch) | |
| tree | 32c83ca7d4709cdde47274f225e17be5ac5747ce | |
| parent | [Blackfin] arch: fix bug - when using trace buffer with CONFIG_MPU enabled. (diff) | |
| download | linux-dev-b4bb68f7d049e923a812903133e7e3747dfe0fce.tar.xz linux-dev-b4bb68f7d049e923a812903133e7e3747dfe0fce.zip | |
[Blackfin] arch: fix bug - Make the MPU code aware of the async banks and the uncached DMA area.
Bug: CONFIG_MPU doesn't seem to handle access to ASYNC/IO Memory well
http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=3912
Signed-off-by: Bernd Schmidt <bernds_cb1@t-online.de>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
| -rw-r--r-- | arch/blackfin/kernel/cplb-mpu/cplbmgr.c | 46 |
1 files changed, 27 insertions, 19 deletions
diff --git a/arch/blackfin/kernel/cplb-mpu/cplbmgr.c b/arch/blackfin/kernel/cplb-mpu/cplbmgr.c index 0a30d6256073..6f1c053903c4 100644 --- a/arch/blackfin/kernel/cplb-mpu/cplbmgr.c +++ b/arch/blackfin/kernel/cplb-mpu/cplbmgr.c @@ -143,30 +143,39 @@ static noinline int dcplb_miss(void) unsigned long d_data; nr_dcplb_miss++; - if (addr >= _ramend) - return CPLB_PROT_VIOL; d_data = CPLB_SUPV_WR | CPLB_VALID | CPLB_DIRTY | PAGE_SIZE_4KB; #ifdef CONFIG_BFIN_DCACHE - d_data |= CPLB_L1_CHBL | ANOMALY_05000158_WORKAROUND; + if (addr < _ramend - DMA_UNCACHED_REGION) { + d_data |= CPLB_L1_CHBL | ANOMALY_05000158_WORKAROUND; #ifdef CONFIG_BFIN_WT - d_data |= CPLB_L1_AOW | CPLB_WT; -#endif + d_data |= CPLB_L1_AOW | CPLB_WT; #endif - mask = current_rwx_mask; - if (mask) { - int page = addr >> PAGE_SHIFT; - int offs = page >> 5; - int bit = 1 << (page & 31); - - if (mask[offs] & bit) - d_data |= CPLB_USER_RD; - - mask += page_mask_nelts; - if (mask[offs] & bit) - d_data |= CPLB_USER_WR; } +#endif + if (addr >= _ramend) { + if (addr >= ASYNC_BANK0_BASE && addr < ASYNC_BANK3_BASE + ASYNC_BANK3_SIZE + && (status & FAULT_USERSUPV)) { + addr &= ~0x3fffff; + d_data &= ~PAGE_SIZE_4KB; + d_data |= PAGE_SIZE_4MB; + } else + return CPLB_PROT_VIOL; + } else { + mask = current_rwx_mask; + if (mask) { + int page = addr >> PAGE_SHIFT; + int offs = page >> 5; + int bit = 1 << (page & 31); + + if (mask[offs] & bit) + d_data |= CPLB_USER_RD; + mask += page_mask_nelts; + if (mask[offs] & bit) + d_data |= CPLB_USER_WR; + } + } idx = evict_one_dcplb(); addr &= PAGE_MASK; @@ -280,8 +289,7 @@ int cplb_hdr(int seqstat, struct pt_regs *regs) case 0x26: return dcplb_miss(); default: - return 1; - panic_cplb_error(seqstat, regs); + return 1; } } |