+++ /dev/null
-// memep-initrams.S -- Initialize local memory ECC/parity
-// $Id: //depot/rel/Cottonwood/Xtensa/OS/xtos/memep-initrams.S#3 $
-
-// Copyright (c) 2006-2010 Tensilica Inc.
-//
-// Permission is hereby granted, free of charge, to any person obtaining
-// a copy of this software and associated documentation files (the
-// "Software"), to deal in the Software without restriction, including
-// without limitation the rights to use, copy, modify, merge, publish,
-// distribute, sublicense, and/or sell copies of the Software, and to
-// permit persons to whom the Software is furnished to do so, subject to
-// the following conditions:
-//
-// The above copyright notice and this permission notice shall be included
-// in all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
-// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
-// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
-// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
-#include <xtensa/coreasm.h>
-
-
- /*
- * void _xtos_memep_initrams(void);
- *
- * Most reset vectors initialize caches, leaving only the local memories
- * (instruction and data RAMs) with potentially some words that have
- * not been written to and thus have uninitialized ECC/parity bits.
- * Loading such a word after enabling ECC/parity checking would result
- * in an exception (or memory error reported in MESR). To avoid this,
- * an application must either carefully avoid loading from uninitialized
- * words, or ensure it writes to every instruction and data RAM word.
- * The latter is what this function does. It reads and writes every
- * word of every local instruction and data RAM. It should normally
- * be called with interrupts disabled. An interrupt might come in
- * between a load and store, in which case any modification made by the
- * interrupt handler to that local memory location is lost when this
- * function resumes and does the store. If no interrupt handler makes
- * any persistent modification to local memories, disabling them around
- * a call to this function may be unnecessary.
- *
- * On the simulator (ISS), everything comes up zeroed, so no there is
- * no need for this initialization.
- */
- .text
- .align 4
- .global _xtos_memep_initrams
-_xtos_memep_initrams:
- abi_entry
-
- // Local Memory ECC/Parity option initialization
-#if XCHAL_HAVE_MEM_ECC_PARITY && (XCHAL_NUM_DATARAM || XCHAL_NUM_INSTRAM /*|| XCHAL_NUM_URAM || XCHAL_NUM_XLMI*/) && !defined(SIMULATOR)
- .section .rodata, "a"
- .align 4
-.L_locmemep_start:
-# if XCHAL_NUM_DATARAM >= 1 && XCHAL_DATARAM0_ECC_PARITY
- .long XCHAL_DATARAM0_VADDR, XCHAL_DATARAM0_VADDR+XCHAL_DATARAM0_SIZE
-# endif
-# if XCHAL_NUM_DATARAM >= 2 && XCHAL_DATARAM1_ECC_PARITY
- .long XCHAL_DATARAM1_VADDR, XCHAL_DATARAM1_VADDR+XCHAL_DATARAM1_SIZE
-# endif
-# if XCHAL_NUM_INSTRAM >= 1 && XCHAL_INSTRAM0_ECC_PARITY
- .long XCHAL_INSTRAM0_VADDR, XCHAL_INSTRAM0_VADDR+XCHAL_INSTRAM0_SIZE
-# endif
-# if XCHAL_NUM_INSTRAM >= 2 && XCHAL_INSTRAM1_ECC_PARITY
- .long XCHAL_INSTRAM1_VADDR, XCHAL_INSTRAM1_VADDR+XCHAL_INSTRAM1_SIZE
-# endif
-.L_locmemep_end:
- .text
- movi a5, .L_locmemep_start // start of table of local memory ranges
- movi a6, .L_locmemep_end // end of table ...
-2: l32i a3, a5, 0 // start of local memory
- l32i a4, a5, 4 // end of local memory
- addi a5, a5, 8 // (next entry in table)
-1: l32i a2, a3, 0 // load and store every word of local memory...
- s32i a2, a3, 0 // ... to initialize all parity and/or ECC bits
- addi a3, a3, 4
- bltu a3, a4, 1b // loop until whole memory initialized
- bltu a5, a6, 2b // loop until all memories initialized
- // ECC/parity bits are now initialized, checking can be turned on.
-#endif /* ECC/parity on instruction or data RAM(s) */
-
- abi_return
-
- .size _xtos_memep_initrams, . - _xtos_memep_initrams
-