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