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#ifndef CYGONCE_HAL_CACHE_H #define CYGONCE_HAL_CACHE_H //============================================================================= // // hal_cache.h // // HAL cache control API // //============================================================================= // ####ECOSGPLCOPYRIGHTBEGIN#### // ------------------------------------------- // This file is part of eCos, the Embedded Configurable Operating System. // Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc. // // eCos 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 or (at your option) any later // version. // // eCos 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 eCos; if not, write to the Free Software Foundation, Inc., // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. // // As a special exception, if other files instantiate templates or use // macros or inline functions from this file, or you compile this file // and link it with other works to produce a work based on this file, // this file does not by itself cause the resulting work to be covered by // the GNU General Public License. However the source code for this file // must still be made available in accordance with section (3) of the GNU // General Public License v2. // // This exception does not invalidate any other reasons why a work based // on this file might be covered by the GNU General Public License. // ------------------------------------------- // ####ECOSGPLCOPYRIGHTEND#### //============================================================================= //#####DESCRIPTIONBEGIN#### // // Author(s): hmt // Contributors:hmt // Date: 1999-07-05 // Purpose: Cache control API // Description: The macros defined here provide the HAL APIs for handling // cache control operations. // Usage: // #include <cyg/hal/hal_cache.h> // ... // // //####DESCRIPTIONEND#### // //============================================================================= #include <cyg/infra/cyg_type.h> //#include <cyg/hal/hal_mmu.h> //----------------------------------------------------------------------------- // FIXME: This definition forces the IO flash driver to use a // known-good procedure for fiddling flash before calling flash device // driver functions. The procedure breaks on other platform/driver // combinations though so is depricated. Hence this definition. // // If you work on this target, please try to remove this definition // and verify that the flash driver still works (both from RAM and // flash). If it does, remove the definition and this comment for good // [and the old macro definition if this happens to be the last client // of that code]. #define HAL_FLASH_CACHES_OLD_MACROS //----------------------------------------------------------------------------- // Cache dimensions #define HAL_DCACHE_SIZE 0x4000 // Size of data cache in bytes #define HAL_DCACHE_LINE_SIZE 32 // Size of a data cache line #define HAL_DCACHE_WAYS 32 // Associativity of the cache #define HAL_DCACHE_SETS (HAL_UCACHE_SIZE/(HAL_UCACHE_LINE_SIZE*HAL_UCACHE_WAYS)) #define HAL_ICACHE_SIZE 0x4000 // Size of instruction cache in bytes #define HAL_ICACHE_LINE_SIZE 32 // Size of ins cache line #define HAL_ICACHE_WAYS 32 // Associativity of the cache #define HAL_ICACHE_SETS (HAL_UCACHE_SIZE/(HAL_UCACHE_LINE_SIZE*HAL_UCACHE_WAYS)) //----------------------------------------------------------------------------- // Global control of data cache // Enable the data cache #define HAL_DCACHE_ENABLE() \ CYG_MACRO_START \ /* SA-110 manual states that the control reg is read-write */ \ asm volatile ( \ "mrc p15,0,r1,c1,c0,0;" \ "orr r1,r1,#0x000F;" /* ensure MM is enabled */ \ "mcr p15,0,r1,c1,c0,0" \ : \ : \ : "r1" /* Clobber list */ \ ); \ CYG_MACRO_END // Disable the data cache (and invalidate it, required semanitcs) #define HAL_DCACHE_DISABLE() \ CYG_MACRO_START \ /* SA-110 manual states that the control reg is read-write */ \ asm volatile ( \ "mrc p15,0,r1,c1,c0,0;" \ "bic r1,r1,#0x000C;" /* but leave MM alone */ \ "mcr p15,0,r1,c1,c0,0;" \ "mov r1,#0;" \ "mcr p15,0,r1,c7,c6,0" /* clear data cache */ \ : \ : \ : "r1" /* Clobber list */ \ ); \ CYG_MACRO_END // Invalidate the entire cache (and both TLBs, just in case) #define HAL_DCACHE_INVALIDATE_ALL() \ CYG_MACRO_START \ /* this macro can discard dirty cache lines. */ \ asm volatile ( \ "mov r1,#0;" \ "mcr p15,0,r1,c7,c6,0;" /* clear data cache */ \ "mcr p15,0,r1,c8,c7,0;" /* flush I+D TLBs */ \ : \ : \ : "r1","memory" /* Clobber list */ \ ); \ CYG_MACRO_END // Synchronize the contents of the cache with memory. #define HAL_DCACHE_SYNC() \ CYG_MACRO_START \ /* This is slightly naff in that the only way to force a dirty */ \ /* line out is by loading other data into its slot, so */ \ /* invalidating that slot. */ \ asm volatile ( \ "mov r0, #0x50000000;" /* 21285~s cache flush region */ \ "add r1, r0, #0x4000;" /* 16MB of fast don~t-care amnesia */ \ "667: " /* We read in 16kB of it */ \ "ldr r2, [r0], #32;" \ "teq r1, r0;" \ "bne 667b;" \ "mov r0,#0;" \ "mcr p15,0,r0,c7,c6,0;" /* clear data cache */ \ "mcr p15,0,r0,c7,c10,4;" /* and drain the write buffer */ \ : \ : \ : "r0","r1","r2" /* Clobber list */ \ ); \ CYG_MACRO_END // Query the state of the data cache #define HAL_DCACHE_IS_ENABLED(_state_) \ CYG_MACRO_START \ /* SA-110 manual states clearly that the control reg is readable */ \ register int reg; \ asm volatile ("mrc p15,0,%0,c1,c0,0" \ : "=r"(reg) \ : \ /*:*/ \ ); \ (_state_) = (0 != (4 & reg)); /* Bit 2 is DCache enable */ \ CYG_MACRO_END // Set the data cache refill burst size //#define HAL_DCACHE_BURST_SIZE(_size_) // Set the data cache write mode //#define HAL_DCACHE_WRITE_MODE( _mode_ ) #define HAL_DCACHE_WRITETHRU_MODE 0 #define HAL_DCACHE_WRITEBACK_MODE 1 // Get the current writeback mode - or only writeback mode if fixed #define HAL_DCACHE_QUERY_WRITE_MODE( _mode_ ) CYG_MACRO_START \ _mode_ = HAL_DCACHE_WRITEBACK_MODE; \ CYG_MACRO_END // Load the contents of the given address range into the data cache // and then lock the cache so that it stays there. //#define HAL_DCACHE_LOCK(_base_, _size_) // Undo a previous lock operation //#define HAL_DCACHE_UNLOCK(_base_, _size_) // Unlock entire cache //#define HAL_DCACHE_UNLOCK_ALL() //----------------------------------------------------------------------------- // Data cache line control // Allocate cache lines for the given address range without reading its // contents from memory. //#define HAL_DCACHE_ALLOCATE( _base_ , _size_ ) // Write dirty cache lines to memory and invalidate the cache entries // for the given address range. #define HAL_DCACHE_FLUSH( _base_ , _size_ ) \ CYG_MACRO_START \ HAL_DCACHE_STORE( _base_ , _size_ ); \ HAL_DCACHE_INVALIDATE( _base_ , _size_ ); \ CYG_MACRO_END // Invalidate cache lines in the given range without writing to memory. #define HAL_DCACHE_INVALIDATE( _base_ , _size_ ) \ CYG_MACRO_START \ register int addr, enda; \ for ( addr = (~(HAL_DCACHE_LINE_SIZE - 1)) & (int)(_base_), \ enda = (int)(_base_) + (_size_); \ addr < enda ; \ addr += HAL_DCACHE_LINE_SIZE ) \ { \ asm volatile ( \ "mcr p15,0,%0,c7,c6,1;" /* flush entry away */ \ : \ : "r"(addr) \ : "memory" \ ); \ } \ CYG_MACRO_END // Write dirty cache lines to memory for the given address range. #define HAL_DCACHE_STORE( _base_ , _size_ ) \ CYG_MACRO_START \ register int addr, enda; \ for ( addr = (~(HAL_DCACHE_LINE_SIZE - 1)) & (int)(_base_), \ enda = (int)(_base_) + (_size_); \ addr < enda ; \ addr += HAL_DCACHE_LINE_SIZE ) \ { \ asm volatile ("mcr p15,0,%0,c7,c10,1;" /* push entry to RAM */ \ : \ : "r"(addr) \ : "memory" \ ); \ } \ /* and also drain the write buffer */ \ asm volatile ( \ "mov r1,#0;" \ "mcr p15,0,r1,c7,c10,4;" \ : \ : \ : "r1", "memory" ); \ CYG_MACRO_END // Preread the given range into the cache with the intention of reading // from it later. //#define HAL_DCACHE_READ_HINT( _base_ , _size_ ) // Preread the given range into the cache with the intention of writing // to it later. //#define HAL_DCACHE_WRITE_HINT( _base_ , _size_ ) // Allocate and zero the cache lines associated with the given range. //#define HAL_DCACHE_ZERO( _base_ , _size_ ) //----------------------------------------------------------------------------- // Global control of Instruction cache // Enable the instruction cache #define HAL_ICACHE_ENABLE() \ CYG_MACRO_START \ /* SA-110 manual states that the control reg is read-write */ \ asm volatile ( \ "mrc p15,0,r1,c1,c0,0;" \ "orr r1,r1,#0x0003;" /* ensure MM is enabled */ \ "orr r1,r1,#0x1000;" /* enable ICache */ \ "mcr p15,0,r1,c1,c0,0" \ : \ : \ : "r1" /* Clobber list */ \ ); \ CYG_MACRO_END // Disable the instruction cache (and invalidate it, required semanitcs) #define HAL_ICACHE_DISABLE() \ CYG_MACRO_START \ /* SA-110 manual states that the control reg is read-write */ \ asm volatile ( \ "mrc p15,0,r1,c1,c0,0;" \ "bic r1,r1,#0x1000;" /* but leave MM alone */ \ "mcr p15,0,r1,c1,c0,0;" \ "mov r1, #0;" \ "mcr p15,0,r1,c7,c5,0;" /* clear instruction cache */ \ "nop;" /* next few instructions may be via cache */ \ "nop;" \ "nop;" \ "nop;" \ "nop;" \ "nop" \ : \ : \ : "r1" /* Clobber list */ \ ); \ CYG_MACRO_END // Invalidate the entire cache #define HAL_ICACHE_INVALIDATE_ALL() \ CYG_MACRO_START \ /* this macro can discard dirty cache lines (N/A for ICache) */ \ asm volatile ( \ "mov r1, #0;" \ "mcr p15,0,r1,c7,c5,0;" /* clear instruction cache */ \ "mcr p15,0,r1,c8,c5,0;" /* flush I TLB only */ \ "nop;" /* next few instructions may be via cache */ \ "nop;" \ "nop;" \ "nop;" \ "nop;" \ "nop" \ : \ : \ : "r1" /* Clobber list */ \ ); \ CYG_MACRO_END // Synchronize the contents of the cache with memory. // (which includes flushing out pending writes) #define HAL_ICACHE_SYNC() \ CYG_MACRO_START \ HAL_DCACHE_SYNC(); /* ensure data gets to RAM */ \ HAL_ICACHE_INVALIDATE_ALL(); /* forget all we know */ \ CYG_MACRO_END // Query the state of the instruction cache #define HAL_ICACHE_IS_ENABLED(_state_) \ CYG_MACRO_START \ /* SA-110 manual states clearly that the control reg is readable */ \ register cyg_uint32 reg; \ asm volatile ("mrc p15,0,%0,c1,c0,0" \ : "=r"(reg) \ : \ /*:*/ \ ); \ (_state_) = (0 != (0x1000 & reg)); /* Bit 12 is ICache enable */ \ CYG_MACRO_END // Set the instruction cache refill burst size //#define HAL_ICACHE_BURST_SIZE(_size_) // Load the contents of the given address range into the instruction cache // and then lock the cache so that it stays there. //#define HAL_ICACHE_LOCK(_base_, _size_) // Undo a previous lock operation //#define HAL_ICACHE_UNLOCK(_base_, _size_) // Unlock entire cache //#define HAL_ICACHE_UNLOCK_ALL() //----------------------------------------------------------------------------- // Instruction cache line control // Invalidate cache lines in the given range without writing to memory. //#define HAL_ICACHE_INVALIDATE( _base_ , _size_ ) //----------------------------------------------------------------------------- #endif // ifndef CYGONCE_HAL_CACHE_H // End of hal_cache.h
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