forked from Imagelibrary/rtems
05a4c70aa9
Place the vector table in the start section so that the overlay can be avoided if we execute from internal flash. The problem is that when the POM is enabled, the ECC cannot be enabled for the internal flash.
145 lines
4.6 KiB
C
145 lines
4.6 KiB
C
/**
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* @file
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*
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* @ingroup RTEMSBSPsARMTMS570
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*
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* @brief TMS570 Parameter Overlay Module functions definitions.
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*/
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/*
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* Copyright (c) 2014 Pavel Pisa <pisa@cmp.felk.cvut.cz>
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*
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* Czech Technical University in Prague
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* Zikova 1903/4
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* 166 36 Praha 6
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* Czech Republic
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#include <stdint.h>
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#include <string.h>
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#include <bsp/tms570-pom.h>
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#include <bsp/linker-symbols.h>
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#include <rtems/score/armv4.h>
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#include <bsp.h>
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/*
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* Placement of exceptions target addresses in memory
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* when insructions with opcode 0xe59ff018
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* ldr pc, [pc, #0x18]
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* are used to fill ARM exception vectors area
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*/
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typedef struct{
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uint32_t reserved1;
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uint32_t except_addr_undef;
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uint32_t except_addr_swi;
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uint32_t except_addr_prefetch;
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uint32_t except_addr_abort;
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uint32_t reserved2;
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uint32_t except_addr_irq;
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uint32_t except_addr_fiq;
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}vec_remap_table;
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void bsp_block_on_exception(void);
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void bsp_block_on_exception(void){
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while(1);
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}
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extern char bsp_int_vec_overlay_start[];
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/*
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* Global overlay target address holds shared MSB bits for all regions
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* It is set to linker RAM_INT_VEC region - i.e. area reserved
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* at internal SRAM memory start, address 0x08000000
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*/
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uint32_t pom_global_overlay_target_address_start =
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(uintptr_t)bsp_int_vec_overlay_start;
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/**
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* @brief initialize and clear parameters overlay module (POM)
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*
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* clears all remap regions. The actual POM enable is left to the first user.
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*
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* @retval Void
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*/
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void tms570_initialize_and_clear(void)
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{
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int i;
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TMS570_POM.GLBCTRL = 0 | (TMS570_POM_GLBCTRL_OTADDR(~0) &
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pom_global_overlay_target_address_start);
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for ( i = 0; i < TMS570_POM_REGIONS; ++i ) {
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TMS570_POM.REG[i].REGSIZE = TMS570_POM_REGSIZE_SIZE(TMS570_POM_REGSIZE_DISABLED);
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}
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}
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/**
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* @brief remaps vector table
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*
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* transfer the rtems start vector table to address 0x0
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*
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* @retval Void
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*/
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void tms570_pom_remap(void)
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{
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void *vec_overlay_start = (void *) pom_global_overlay_target_address_start;
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void *addr_tab = (char *) bsp_start_vector_table_begin + 64;
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if (vec_overlay_start == addr_tab) {
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return;
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}
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/*
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* Copy RTEMS the first level exception processing code
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* to RAM area which can be used for later as POM overlay
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* of Flash vectors. The code is expected to have for of eight
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* ldr pc, [pc,#0x18]
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* instructions followed by eight words with actual exception
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* service routines target addresses. This is case of RTEMS default
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* table found in
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* c/src/lib/libbsp/arm/shared/start/start.S
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*/
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rtems_cache_invalidate_multiple_data_lines(addr_tab, 64);
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memcpy(vec_overlay_start, addr_tab, 64);
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rtems_cache_flush_multiple_data_lines(vec_overlay_start, 64);
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rtems_cache_invalidate_multiple_instruction_lines(vec_overlay_start, 64);
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#if 0
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{
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/* Fill exception table by catch error infinite loop for debugging */
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vec_remap_table* vec_table = (vec_remap_table*)(vec_overlay_start+32);
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vec_table->except_addr_undef = (uint32_t)bsp_block_on_exception;
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vec_table->except_addr_swi = (uint32_t)bsp_block_on_exception;
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vec_table->except_addr_prefetch = (uint32_t)bsp_block_on_exception;//_ARMV4_Exception_prefetch_abort;
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vec_table->except_addr_abort = (uint32_t)bsp_block_on_exception;//_ARMV4_Exception_data_abort;
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vec_table->except_addr_irq = (uint32_t)_ARMV4_Exception_interrupt;
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vec_table->except_addr_fiq = (uint32_t)bsp_block_on_exception;//_ARMV4_Exception_interrupt;
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}
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#endif
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/*
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* The overlay vectors replacement area cannot be used directly
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* to replace jump instructions on start of Flash because instruction
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* fetch through POM is not reliable supported (works in most times
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* but sometimes fails).
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* Area of 64 bytes starting at address 0x00000040 is replaced.
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* This way target addresses are placed between 0x00000060
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* and 0x0000007F. If boot loader startup code contains instructions
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* ldr pc,[pc,#0x58]
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* (opcode 0xe59ff058) then the jump target addresses are replaced
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* by pointers to actual RTEMS exceptions service functions.
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*/
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TMS570_POM.REG[0].PROGSTART = TMS570_POM_PROGSTART_STARTADDRESS(64);
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TMS570_POM.REG[0].OVLSTART = TMS570_POM_OVLSTART_STARTADDRESS(vec_overlay_start);
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TMS570_POM.REG[0].REGSIZE = TMS570_POM_REGSIZE_SIZE(TMS570_POM_REGSIZE_64B);
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TMS570_POM.GLBCTRL = TMS570_POM_GLBCTRL_ON_OFF(0xa) |
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TMS570_POM_GLBCTRL_ETO(0xa) |
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(TMS570_POM_GLBCTRL_OTADDR(~0) &
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pom_global_overlay_target_address_start);
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}
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