diff options
Diffstat (limited to 'cpu/blackfin/flush.S')
| -rw-r--r-- | cpu/blackfin/flush.S | 230 |
1 files changed, 0 insertions, 230 deletions
diff --git a/cpu/blackfin/flush.S b/cpu/blackfin/flush.S deleted file mode 100644 index 417f798f8..000000000 --- a/cpu/blackfin/flush.S +++ /dev/null @@ -1,230 +0,0 @@ -/* flush.S - low level cache flushing routines - * Copyright (C) 2003-2007 Analog Devices Inc. - * Licensed under the GPL-2 or later. - */ - -#include <config.h> -#include <asm/blackfin.h> -#include <asm/cplb.h> -#include <asm/mach-common/bits/mpu.h> - -.text - -/* This is an external function being called by the user - * application through __flush_cache_all. Currently this function - * serves the purpose of flushing all the pending writes in - * in the data cache. - */ - -ENTRY(_flush_data_cache) - [--SP] = ( R7:6, P5:4 ); - LINK 12; - SP += -12; - P5.H = HI(DCPLB_ADDR0); - P5.L = LO(DCPLB_ADDR0); - P4.H = HI(DCPLB_DATA0); - P4.L = LO(DCPLB_DATA0); - R7 = CPLB_VALID | CPLB_L1_CHBL | CPLB_DIRTY (Z); - R6 = 16; -.Lnext: R0 = [P5++]; - R1 = [P4++]; - CC = BITTST(R1, 14); /* Is it write-through?*/ - IF CC JUMP .Lskip; /* If so, ignore it.*/ - R2 = R1 & R7; /* Is it a dirty, cached page?*/ - CC = R2; - IF !CC JUMP .Lskip; /* If not, ignore it.*/ - [--SP] = RETS; - CALL _dcplb_flush; /* R0 = page, R1 = data*/ - RETS = [SP++]; -.Lskip: R6 += -1; - CC = R6; - IF CC JUMP .Lnext; - SSYNC; - SP += 12; - UNLINK; - ( R7:6, P5:4 ) = [SP++]; - RTS; -ENDPROC(_flush_data_cache) - -/* This is an internal function to flush all pending - * writes in the cache associated with a particular DCPLB. - * - * R0 - page's start address - * R1 - CPLB's data field. - */ - -.align 2 -ENTRY(_dcplb_flush) - [--SP] = ( R7:0, P5:0 ); - [--SP] = LC0; - [--SP] = LT0; - [--SP] = LB0; - [--SP] = LC1; - [--SP] = LT1; - [--SP] = LB1; - - /* If it's a 1K or 4K page, then it's quickest to - * just systematically flush all the addresses in - * the page, regardless of whether they're in the - * cache, or dirty. If it's a 1M or 4M page, there - * are too many addresses, and we have to search the - * cache for lines corresponding to the page. - */ - - CC = BITTST(R1, 17); /* 1MB or 4MB */ - IF !CC JUMP .Ldflush_whole_page; - - /* We're only interested in the page's size, so extract - * this from the CPLB (bits 17:16), and scale to give an - * offset into the page_size and page_prefix tables. - */ - - R1 <<= 14; - R1 >>= 30; - R1 <<= 2; - - /* The page could be mapped into Bank A or Bank B, depending - * on (a) whether both banks are configured as cache, and - * (b) on whether address bit A[x] is set. x is determined - * by DCBS in DMEM_CONTROL - */ - - R2 = 0; /* Default to Bank A (Bank B would be 1)*/ - - P0.L = LO(DMEM_CONTROL); - P0.H = HI(DMEM_CONTROL); - - R3 = [P0]; /* If Bank B is not enabled as cache*/ - CC = BITTST(R3, 2); /* then Bank A is our only option.*/ - IF CC JUMP .Lbank_chosen; - - R4 = 1<<14; /* If DCBS==0, use A[14].*/ - R5 = R4 << 7; /* If DCBS==1, use A[23];*/ - CC = BITTST(R3, 4); - IF CC R4 = R5; /* R4 now has either bit 14 or bit 23 set.*/ - R5 = R0 & R4; /* Use it to test the Page address*/ - CC = R5; /* and if that bit is set, we use Bank B,*/ - R2 = CC; /* else we use Bank A.*/ - R2 <<= 23; /* The Bank selection's at posn 23.*/ - -.Lbank_chosen: - - /* We can also determine the sub-bank used, because this is - * taken from bits 13:12 of the address. - */ - - R3 = ((12<<8)|2); /* Extraction pattern */ - nop; /*Anamoly 05000209*/ - R4 = EXTRACT(R0, R3.L) (Z); /* Extract bits*/ - /* Save in extraction pattern for later deposit.*/ - R3.H = R4.L << 0; - - /* So: - * R0 = Page start - * R1 = Page length (actually, offset into size/prefix tables) - * R2 = Bank select mask - * R3 = sub-bank deposit values - * - * The cache has 2 Ways, and 64 sets, so we iterate through - * the sets, accessing the tag for each Way, for our Bank and - * sub-bank, looking for dirty, valid tags that match our - * address prefix. - */ - - P5.L = LO(DTEST_COMMAND); - P5.H = HI(DTEST_COMMAND); - P4.L = LO(DTEST_DATA0); - P4.H = HI(DTEST_DATA0); - - P0.L = page_prefix_table; - P0.H = page_prefix_table; - P1 = R1; - R5 = 0; /* Set counter*/ - P0 = P1 + P0; - R4 = [P0]; /* This is the address prefix*/ - - - /* We're reading (bit 1==0) the tag (bit 2==0), and we - * don't care about which double-word, since we're only - * fetching tags, so we only have to set Set, Bank, - * Sub-bank and Way. - */ - - P2 = 2; - LSETUP (.Lfs1, .Lfe1) LC1 = P2; -.Lfs1: P0 = 64; /* iterate over all sets*/ - LSETUP (.Lfs0, .Lfe0) LC0 = P0; -.Lfs0: R6 = R5 << 5; /* Combine set*/ - R6.H = R3.H << 0 ; /* and sub-bank*/ - R6 = R6 | R2; /* and Bank. Leave Way==0 at first.*/ - BITSET(R6,14); - [P5] = R6; /* Issue Command*/ - SSYNC; - R7 = [P4]; /* and read Tag.*/ - CC = BITTST(R7, 0); /* Check if valid*/ - IF !CC JUMP .Lfskip; /* and skip if not.*/ - CC = BITTST(R7, 1); /* Check if dirty*/ - IF !CC JUMP .Lfskip; /* and skip if not.*/ - - /* Compare against the page address. First, plant bits 13:12 - * into the tag, since those aren't part of the returned data. - */ - - R7 = DEPOSIT(R7, R3); /* set 13:12*/ - R1 = R7 & R4; /* Mask off lower bits*/ - CC = R1 == R0; /* Compare against page start.*/ - IF !CC JUMP .Lfskip; /* Skip it if it doesn't match.*/ - - /* Tag address matches against page, so this is an entry - * we must flush. - */ - - R7 >>= 10; /* Mask off the non-address bits*/ - R7 <<= 10; - P3 = R7; - SSYNC; - FLUSHINV [P3]; /* And flush the entry*/ -.Lfskip: -.Lfe0: R5 += 1; /* Advance to next Set*/ -.Lfe1: BITSET(R2, 26); /* Go to next Way.*/ - -.Ldfinished: - SSYNC; /* Ensure the data gets out to mem.*/ - - /*Finished. Restore context.*/ - LB1 = [SP++]; - LT1 = [SP++]; - LC1 = [SP++]; - LB0 = [SP++]; - LT0 = [SP++]; - LC0 = [SP++]; - ( R7:0, P5:0 ) = [SP++]; - RTS; - -.Ldflush_whole_page: - - /* It's a 1K or 4K page, so quicker to just flush the - * entire page. - */ - - P1 = 32; /* For 1K pages*/ - P2 = P1 << 2; /* For 4K pages*/ - P0 = R0; /* Start of page*/ - CC = BITTST(R1, 16); /* Whether 1K or 4K*/ - IF CC P1 = P2; - P1 += -1; /* Unroll one iteration*/ - SSYNC; - FLUSHINV [P0++]; /* because CSYNC can't end loops.*/ - LSETUP (.Leall, .Leall) LC0 = P1; -.Leall: FLUSHINV [P0++]; - SSYNC; - JUMP .Ldfinished; -ENDPROC(_dcplb_flush) - -.align 4; -page_prefix_table: -.byte4 0xFFFFFC00; /* 1K */ -.byte4 0xFFFFF000; /* 4K */ -.byte4 0xFFF00000; /* 1M */ -.byte4 0xFFC00000; /* 4M */ -.page_prefix_table.end: |