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Diffstat (limited to 'arch/blackfin/mach-common/cplbmgr.S')
| -rw-r--r-- | arch/blackfin/mach-common/cplbmgr.S | 646 |
1 files changed, 0 insertions, 646 deletions
diff --git a/arch/blackfin/mach-common/cplbmgr.S b/arch/blackfin/mach-common/cplbmgr.S deleted file mode 100644 index f5cf3accef37..000000000000 --- a/arch/blackfin/mach-common/cplbmgr.S +++ /dev/null @@ -1,646 +0,0 @@ -/* - * File: arch/blackfin/mach-common/cplbmgtr.S - * Based on: - * Author: LG Soft India - * - * Created: ? - * Description: CPLB replacement routine for CPLB mismatch - * - * Modified: - * Copyright 2004-2006 Analog Devices Inc. - * - * Bugs: Enter bugs at http://blackfin.uclinux.org/ - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, see the file COPYING, or write - * to the Free Software Foundation, Inc., - * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/* Usage: int _cplb_mgr(is_data_miss,int enable_cache) - * is_data_miss==2 => Mark as Dirty, write to the clean data page - * is_data_miss==1 => Replace a data CPLB. - * is_data_miss==0 => Replace an instruction CPLB. - * - * Returns: - * CPLB_RELOADED => Successfully updated CPLB table. - * CPLB_NO_UNLOCKED => All CPLBs are locked, so cannot be evicted. - * This indicates that the CPLBs in the configuration - * tablei are badly configured, as this should never - * occur. - * CPLB_NO_ADDR_MATCH => The address being accessed, that triggered the - * exception, is not covered by any of the CPLBs in - * the configuration table. The application is - * presumably misbehaving. - * CPLB_PROT_VIOL => The address being accessed, that triggered the - * exception, was not a first-write to a clean Write - * Back Data page, and so presumably is a genuine - * violation of the page's protection attributes. - * The application is misbehaving. - */ - -#include <linux/linkage.h> -#include <asm/blackfin.h> -#include <asm/cplb.h> - -#ifdef CONFIG_EXCPT_IRQ_SYSC_L1 -.section .l1.text -#else -.text -#endif - -.align 2; -ENTRY(_cplb_mgr) - - [--SP]=( R7:4,P5:3 ); - - CC = R0 == 2; - IF CC JUMP .Ldcplb_write; - - CC = R0 == 0; - IF !CC JUMP .Ldcplb_miss_compare; - - /* ICPLB Miss Exception. We need to choose one of the - * currently-installed CPLBs, and replace it with one - * from the configuration table. - */ - - /* A multi-word instruction can cross a page boundary. This means the - * first part of the instruction can be in a valid page, but the - * second part is not, and hence generates the instruction miss. - * However, the fault address is for the start of the instruction, - * not the part that's in the bad page. Therefore, we have to check - * whether the fault address applies to a page that is already present - * in the table. - */ - - P4.L = LO(ICPLB_FAULT_ADDR); - P4.H = HI(ICPLB_FAULT_ADDR); - - P1 = 16; - P5.L = _page_size_table; - P5.H = _page_size_table; - - P0.L = LO(ICPLB_DATA0); - P0.H = HI(ICPLB_DATA0); - R4 = [P4]; /* Get faulting address*/ - R6 = 64; /* Advance past the fault address, which*/ - R6 = R6 + R4; /* we'll use if we find a match*/ - R3 = ((16 << 8) | 2); /* Extract mask, two bits at posn 16 */ - - R5 = 0; -.Lisearch: - - R1 = [P0-0x100]; /* Address for this CPLB */ - - R0 = [P0++]; /* Info for this CPLB*/ - CC = BITTST(R0,0); /* Is the CPLB valid?*/ - IF !CC JUMP .Lnomatch; /* Skip it, if not.*/ - CC = R4 < R1(IU); /* If fault address less than page start*/ - IF CC JUMP .Lnomatch; /* then skip this one.*/ - R2 = EXTRACT(R0,R3.L) (Z); /* Get page size*/ - P1 = R2; - P1 = P5 + (P1<<2); /* index into page-size table*/ - R2 = [P1]; /* Get the page size*/ - R1 = R1 + R2; /* and add to page start, to get page end*/ - CC = R4 < R1(IU); /* and see whether fault addr is in page.*/ - IF !CC R4 = R6; /* If so, advance the address and finish loop.*/ - IF !CC JUMP .Lisearch_done; -.Lnomatch: - /* Go around again*/ - R5 += 1; - CC = BITTST(R5, 4); /* i.e CC = R5 >= 16*/ - IF !CC JUMP .Lisearch; - -.Lisearch_done: - I0 = R4; /* Fault address we'll search for*/ - - /* set up pointers */ - P0.L = LO(ICPLB_DATA0); - P0.H = HI(ICPLB_DATA0); - - /* The replacement procedure for ICPLBs */ - - P4.L = LO(IMEM_CONTROL); - P4.H = HI(IMEM_CONTROL); - - /* Turn off CPLBs while we work, necessary according to HRM before - * modifying CPLB descriptors - */ - R5 = [P4]; /* Control Register*/ - BITCLR(R5,ENICPLB_P); - CLI R1; - SSYNC; /* SSYNC required before writing to IMEM_CONTROL. */ - .align 8; - [P4] = R5; - SSYNC; - STI R1; - - R1 = -1; /* end point comparison */ - R3 = 16; /* counter */ - - /* Search through CPLBs for first non-locked entry */ - /* Overwrite it by moving everyone else up by 1 */ -.Licheck_lock: - R0 = [P0++]; - R3 = R3 + R1; - CC = R3 == R1; - IF CC JUMP .Lall_locked; - CC = BITTST(R0, 0); /* an invalid entry is good */ - IF !CC JUMP .Lifound_victim; - CC = BITTST(R0,1); /* but a locked entry isn't */ - IF CC JUMP .Licheck_lock; - -.Lifound_victim: -#ifdef CONFIG_CPLB_INFO - R7 = [P0 - 0x104]; - P2.L = _ipdt_table; - P2.H = _ipdt_table; - P3.L = _ipdt_swapcount_table; - P3.H = _ipdt_swapcount_table; - P3 += -4; -.Licount: - R2 = [P2]; /* address from config table */ - P2 += 8; - P3 += 8; - CC = R2==-1; - IF CC JUMP .Licount_done; - CC = R7==R2; - IF !CC JUMP .Licount; - R7 = [P3]; - R7 += 1; - [P3] = R7; - CSYNC; -.Licount_done: -#endif - LC0=R3; - LSETUP(.Lis_move,.Lie_move) LC0; -.Lis_move: - R0 = [P0]; - [P0 - 4] = R0; - R0 = [P0 - 0x100]; - [P0-0x104] = R0; -.Lie_move: - P0+=4; - - /* Clear ICPLB_DATA15, in case we don't find a replacement - * otherwise, we would have a duplicate entry, and will crash - */ - R0 = 0; - [P0 - 4] = R0; - - /* We've made space in the ICPLB table, so that ICPLB15 - * is now free to be overwritten. Next, we have to determine - * which CPLB we need to install, from the configuration - * table. This is a matter of getting the start-of-page - * addresses and page-lengths from the config table, and - * determining whether the fault address falls within that - * range. - */ - - P2.L = _ipdt_table; - P2.H = _ipdt_table; -#ifdef CONFIG_CPLB_INFO - P3.L = _ipdt_swapcount_table; - P3.H = _ipdt_swapcount_table; - P3 += -8; -#endif - P0.L = _page_size_table; - P0.H = _page_size_table; - - /* Retrieve our fault address (which may have been advanced - * because the faulting instruction crossed a page boundary). - */ - - R0 = I0; - - /* An extraction pattern, to get the page-size bits from - * the CPLB data entry. Bits 16-17, so two bits at posn 16. - */ - - R1 = ((16<<8)|2); -.Linext: R4 = [P2++]; /* address from config table */ - R2 = [P2++]; /* data from config table */ -#ifdef CONFIG_CPLB_INFO - P3 += 8; -#endif - - CC = R4 == -1; /* End of config table*/ - IF CC JUMP .Lno_page_in_table; - - /* See if failed address > start address */ - CC = R4 <= R0(IU); - IF !CC JUMP .Linext; - - /* extract page size (17:16)*/ - R3 = EXTRACT(R2, R1.L) (Z); - - /* add page size to addr to get range */ - - P5 = R3; - P5 = P0 + (P5 << 2); /* scaled, for int access*/ - R3 = [P5]; - R3 = R3 + R4; - - /* See if failed address < (start address + page size) */ - CC = R0 < R3(IU); - IF !CC JUMP .Linext; - - /* We've found a CPLB in the config table that covers - * the faulting address, so install this CPLB into the - * last entry of the table. - */ - - P1.L = LO(ICPLB_DATA15); /* ICPLB_DATA15 */ - P1.H = HI(ICPLB_DATA15); - [P1] = R2; - [P1-0x100] = R4; -#ifdef CONFIG_CPLB_INFO - R3 = [P3]; - R3 += 1; - [P3] = R3; -#endif - - /* P4 points to IMEM_CONTROL, and R5 contains its old - * value, after we disabled ICPLBS. Re-enable them. - */ - - BITSET(R5,ENICPLB_P); - CLI R2; - SSYNC; /* SSYNC required before writing to IMEM_CONTROL. */ - .align 8; - [P4] = R5; - SSYNC; - STI R2; - - ( R7:4,P5:3 ) = [SP++]; - R0 = CPLB_RELOADED; - RTS; - -/* FAILED CASES*/ -.Lno_page_in_table: - R0 = CPLB_NO_ADDR_MATCH; - JUMP .Lfail_ret; - -.Lall_locked: - R0 = CPLB_NO_UNLOCKED; - JUMP .Lfail_ret; - -.Lprot_violation: - R0 = CPLB_PROT_VIOL; - -.Lfail_ret: - /* Make sure we turn protection/cache back on, even in the failing case */ - BITSET(R5,ENICPLB_P); - CLI R2; - SSYNC; /* SSYNC required before writing to IMEM_CONTROL. */ - .align 8; - [P4] = R5; - SSYNC; - STI R2; - - ( R7:4,P5:3 ) = [SP++]; - RTS; - -.Ldcplb_write: - - /* if a DCPLB is marked as write-back (CPLB_WT==0), and - * it is clean (CPLB_DIRTY==0), then a write to the - * CPLB's page triggers a protection violation. We have to - * mark the CPLB as dirty, to indicate that there are - * pending writes associated with the CPLB. - */ - - P4.L = LO(DCPLB_STATUS); - P4.H = HI(DCPLB_STATUS); - P3.L = LO(DCPLB_DATA0); - P3.H = HI(DCPLB_DATA0); - R5 = [P4]; - - /* A protection violation can be caused by more than just writes - * to a clean WB page, so we have to ensure that: - * - It's a write - * - to a clean WB page - * - and is allowed in the mode the access occurred. - */ - - CC = BITTST(R5, 16); /* ensure it was a write*/ - IF !CC JUMP .Lprot_violation; - - /* to check the rest, we have to retrieve the DCPLB.*/ - - /* The low half of DCPLB_STATUS is a bit mask*/ - - R2 = R5.L (Z); /* indicating which CPLB triggered the event.*/ - R3 = 30; /* so we can use this to determine the offset*/ - R2.L = SIGNBITS R2; - R2 = R2.L (Z); /* into the DCPLB table.*/ - R3 = R3 - R2; - P4 = R3; - P3 = P3 + (P4<<2); - R3 = [P3]; /* Retrieve the CPLB*/ - - /* Now we can check whether it's a clean WB page*/ - - CC = BITTST(R3, 14); /* 0==WB, 1==WT*/ - IF CC JUMP .Lprot_violation; - CC = BITTST(R3, 7); /* 0 == clean, 1 == dirty*/ - IF CC JUMP .Lprot_violation; - - /* Check whether the write is allowed in the mode that was active.*/ - - R2 = 1<<3; /* checking write in user mode*/ - CC = BITTST(R5, 17); /* 0==was user, 1==was super*/ - R5 = CC; - R2 <<= R5; /* if was super, check write in super mode*/ - R2 = R3 & R2; - CC = R2 == 0; - IF CC JUMP .Lprot_violation; - - /* It's a genuine write-to-clean-page.*/ - - BITSET(R3, 7); /* mark as dirty*/ - [P3] = R3; /* and write back.*/ - NOP; - CSYNC; - ( R7:4,P5:3 ) = [SP++]; - R0 = CPLB_RELOADED; - RTS; - -.Ldcplb_miss_compare: - - /* Data CPLB Miss event. We need to choose a CPLB to - * evict, and then locate a new CPLB to install from the - * config table, that covers the faulting address. - */ - - P1.L = LO(DCPLB_DATA15); - P1.H = HI(DCPLB_DATA15); - - P4.L = LO(DCPLB_FAULT_ADDR); - P4.H = HI(DCPLB_FAULT_ADDR); - R4 = [P4]; - I0 = R4; - - /* The replacement procedure for DCPLBs*/ - - R6 = R1; /* Save for later*/ - - /* Turn off CPLBs while we work.*/ - P4.L = LO(DMEM_CONTROL); - P4.H = HI(DMEM_CONTROL); - R5 = [P4]; - BITCLR(R5,ENDCPLB_P); - CLI R0; - SSYNC; /* SSYNC required before writing to DMEM_CONTROL. */ - .align 8; - [P4] = R5; - SSYNC; - STI R0; - - /* Start looking for a CPLB to evict. Our order of preference - * is: invalid CPLBs, clean CPLBs, dirty CPLBs. Locked CPLBs - * are no good. - */ - - I1.L = LO(DCPLB_DATA0); - I1.H = HI(DCPLB_DATA0); - P1 = 2; - P2 = 16; - I2.L = _dcplb_preference; - I2.H = _dcplb_preference; - LSETUP(.Lsdsearch1, .Ledsearch1) LC0 = P1; -.Lsdsearch1: - R0 = [I2++]; /* Get the bits we're interested in*/ - P0 = I1; /* Go back to start of table*/ - LSETUP (.Lsdsearch2, .Ledsearch2) LC1 = P2; -.Lsdsearch2: - R1 = [P0++]; /* Fetch each installed CPLB in turn*/ - R2 = R1 & R0; /* and test for interesting bits.*/ - CC = R2 == 0; /* If none are set, it'll do.*/ - IF !CC JUMP .Lskip_stack_check; - - R2 = [P0 - 0x104]; /* R2 - PageStart */ - P3.L = _page_size_table; /* retrieve end address */ - P3.H = _page_size_table; /* retrieve end address */ - R3 = 0x1002; /* 16th - position, 2 bits -length */ -#if ANOMALY_05000209 - nop; /* Anomaly 05000209 */ -#endif - R7 = EXTRACT(R1,R3.l); - R7 = R7 << 2; /* Page size index offset */ - P5 = R7; - P3 = P3 + P5; - R7 = [P3]; /* page size in bytes */ - - R7 = R2 + R7; /* R7 - PageEnd */ - R4 = SP; /* Test SP is in range */ - - CC = R7 < R4; /* if PageEnd < SP */ - IF CC JUMP .Ldfound_victim; - R3 = 0x284; /* stack length from start of trap till - * the point. - * 20 stack locations for future modifications - */ - R4 = R4 + R3; - CC = R4 < R2; /* if SP + stacklen < PageStart */ - IF CC JUMP .Ldfound_victim; -.Lskip_stack_check: - -.Ledsearch2: NOP; -.Ledsearch1: NOP; - - /* If we got here, we didn't find a DCPLB we considered - * replacable, which means all of them were locked. - */ - - JUMP .Lall_locked; -.Ldfound_victim: - -#ifdef CONFIG_CPLB_INFO - R7 = [P0 - 0x104]; - P2.L = _dpdt_table; - P2.H = _dpdt_table; - P3.L = _dpdt_swapcount_table; - P3.H = _dpdt_swapcount_table; - P3 += -4; -.Ldicount: - R2 = [P2]; - P2 += 8; - P3 += 8; - CC = R2==-1; - IF CC JUMP .Ldicount_done; - CC = R7==R2; - IF !CC JUMP .Ldicount; - R7 = [P3]; - R7 += 1; - [P3] = R7; -.Ldicount_done: -#endif - - /* Clean down the hardware loops*/ - R2 = 0; - LC1 = R2; - LC0 = R2; - - /* There's a suitable victim in [P0-4] (because we've - * advanced already). - */ - -.LDdoverwrite: - - /* [P0-4] is a suitable victim CPLB, so we want to - * overwrite it by moving all the following CPLBs - * one space closer to the start. - */ - - R1.L = LO(DCPLB_DATA16); /* DCPLB_DATA15 + 4 */ - R1.H = HI(DCPLB_DATA16); - R0 = P0; - - /* If the victim happens to be in DCPLB15, - * we don't need to move anything. - */ - - CC = R1 == R0; - IF CC JUMP .Lde_moved; - R1 = R1 - R0; - R1 >>= 2; - P1 = R1; - LSETUP(.Lds_move, .Lde_move) LC0=P1; -.Lds_move: - R0 = [P0++]; /* move data */ - [P0 - 8] = R0; - R0 = [P0-0x104] /* move address */ -.Lde_move: - [P0-0x108] = R0; - -.Lde_moved: - NOP; - - /* Clear DCPLB_DATA15, in case we don't find a replacement - * otherwise, we would have a duplicate entry, and will crash - */ - R0 = 0; - [P0 - 0x4] = R0; - - /* We've now made space in DCPLB15 for the new CPLB to be - * installed. The next stage is to locate a CPLB in the - * config table that covers the faulting address. - */ - - R0 = I0; /* Our faulting address */ - - P2.L = _dpdt_table; - P2.H = _dpdt_table; -#ifdef CONFIG_CPLB_INFO - P3.L = _dpdt_swapcount_table; - P3.H = _dpdt_swapcount_table; - P3 += -8; -#endif - - P1.L = _page_size_table; - P1.H = _page_size_table; - - /* An extraction pattern, to retrieve bits 17:16.*/ - - R1 = (16<<8)|2; -.Ldnext: R4 = [P2++]; /* address */ - R2 = [P2++]; /* data */ -#ifdef CONFIG_CPLB_INFO - P3 += 8; -#endif - - CC = R4 == -1; - IF CC JUMP .Lno_page_in_table; - - /* See if failed address > start address */ - CC = R4 <= R0(IU); - IF !CC JUMP .Ldnext; - - /* extract page size (17:16)*/ - R3 = EXTRACT(R2, R1.L) (Z); - - /* add page size to addr to get range */ - - P5 = R3; - P5 = P1 + (P5 << 2); - R3 = [P5]; - R3 = R3 + R4; - - /* See if failed address < (start address + page size) */ - CC = R0 < R3(IU); - IF !CC JUMP .Ldnext; - - /* We've found the CPLB that should be installed, so - * write it into CPLB15, masking off any caching bits - * if necessary. - */ - - P1.L = LO(DCPLB_DATA15); - P1.H = HI(DCPLB_DATA15); - - /* If the DCPLB has cache bits set, but caching hasn't - * been enabled, then we want to mask off the cache-in-L1 - * bit before installing. Moreover, if caching is off, we - * also want to ensure that the DCPLB has WT mode set, rather - * than WB, since WB pages still trigger first-write exceptions - * even when not caching is off, and the page isn't marked as - * cachable. Finally, we could mark the page as clean, not dirty, - * but we choose to leave that decision to the user; if the user - * chooses to have a CPLB pre-defined as dirty, then they always - * pay the cost of flushing during eviction, but don't pay the - * cost of first-write exceptions to mark the page as dirty. - */ - -#ifdef CONFIG_BFIN_WT - BITSET(R6, 14); /* Set WT*/ -#endif - - [P1] = R2; - [P1-0x100] = R4; -#ifdef CONFIG_CPLB_INFO - R3 = [P3]; - R3 += 1; - [P3] = R3; -#endif - - /* We've installed the CPLB, so re-enable CPLBs. P4 - * points to DMEM_CONTROL, and R5 is the value we - * last wrote to it, when we were disabling CPLBs. - */ - - BITSET(R5,ENDCPLB_P); - CLI R2; - .align 8; - [P4] = R5; - SSYNC; - STI R2; - - ( R7:4,P5:3 ) = [SP++]; - R0 = CPLB_RELOADED; - RTS; -ENDPROC(_cplb_mgr) - -.data -.align 4; -_page_size_table: -.byte4 0x00000400; /* 1K */ -.byte4 0x00001000; /* 4K */ -.byte4 0x00100000; /* 1M */ -.byte4 0x00400000; /* 4M */ - -.align 4; -_dcplb_preference: -.byte4 0x00000001; /* valid bit */ -.byte4 0x00000002; /* lock bit */ |