diff options
Diffstat (limited to 'bsps/powerpc/ss555/start/raw_exception.c')
| -rw-r--r-- | bsps/powerpc/ss555/start/raw_exception.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/bsps/powerpc/ss555/start/raw_exception.c b/bsps/powerpc/ss555/start/raw_exception.c new file mode 100644 index 0000000000..6cb35be650 --- /dev/null +++ b/bsps/powerpc/ss555/start/raw_exception.c @@ -0,0 +1,190 @@ +/* + * raw_exception.c - This file contains implementation of C functions to + * Instantiate mpc5xx primary exception entries. + * More detailled information can be found on the Motorola + * site and more precisely in the following book: + * + * MPC555/MPC556 User's Manual + * Motorola REF : MPC555UM/D Rev. 3, 2000 October 15 + * + * + * MPC5xx port sponsored by Defence Research and Development Canada - Suffield + * Copyright (C) 2004, Real-Time Systems Inc. (querbach@realtime.bc.ca) + * + * Derived from libcpu/powerpc/mpc8xx/exceptions/raw_exception.c: + * + * Copyright (C) 1999 Eric Valette (valette@crf.canon.fr) + * Canon Centre Recherche France. + * + * 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 <rtems.h> +#include <rtems/score/powerpc.h> +#include <libcpu/raw_exception.h> +#include <libcpu/cpuIdent.h> +#include <rtems/bspIo.h> /* for printk */ +#include <string.h> + +static rtems_raw_except_connect_data* raw_except_table; +static rtems_raw_except_connect_data default_raw_except_entry; +static rtems_raw_except_global_settings* local_settings; + +int mpc5xx_vector_is_valid(rtems_vector vector) +{ + switch (current_ppc_cpu) { + case PPC_5XX: + switch(vector) { + case ASM_RESET_VECTOR: + case ASM_MACH_VECTOR: + + case ASM_EXT_VECTOR: + case ASM_ALIGN_VECTOR: + case ASM_PROG_VECTOR: + case ASM_FLOAT_VECTOR: + case ASM_DEC_VECTOR: + + case ASM_SYS_VECTOR: + case ASM_TRACE_VECTOR: + case ASM_FLOATASSIST_VECTOR: + + case ASM_SOFTEMUL_VECTOR: + + case ASM_IPROT_VECTOR: + case ASM_DPROT_VECTOR: + + case ASM_DBREAK_VECTOR: + case ASM_IBREAK_VECTOR: + case ASM_MEBREAK_VECTOR: + case ASM_NMEBREAK_VECTOR: + return 1; + default: + return 0; + } + default: + printk("Please complete libcpu/powerpc/mpc5xx/exceptions/raw_exception.c\n"); + printk("current_ppc_cpu = %x\n", current_ppc_cpu); + return 0; + } +} + +int mpc5xx_set_exception (const rtems_raw_except_connect_data* except) +{ + rtems_interrupt_level level; + + if (!mpc5xx_vector_is_valid(except->exceptIndex)) { + return 0; + } + /* + * Check if default handler is actually connected. If not issue an error. + * You must first get the current handler via mpc5xx_get_current_exception + * and then disconnect it using mpc5xx_delete_exception. + * RATIONALE : to always have the same transition by forcing the user + * to get the previous handler before accepting to disconnect. + */ + if (exception_handler_table[except->exceptIndex] != + default_raw_except_entry.hdl.raw_hdl) { + return 0; + } + + rtems_interrupt_disable(level); + + raw_except_table[except->exceptIndex] = *except; + + exception_handler_table[except->exceptIndex] = except->hdl.raw_hdl; + if (except->on) + except->on(except); + + rtems_interrupt_enable(level); + return 1; +} + +int mpc5xx_get_current_exception (rtems_raw_except_connect_data* except) +{ + if (!mpc5xx_vector_is_valid(except->exceptIndex)){ + return 0; + } + + *except = raw_except_table[except->exceptIndex]; + + return 1; +} + +int mpc5xx_delete_exception (const rtems_raw_except_connect_data* except) +{ + rtems_interrupt_level level; + + if (!mpc5xx_vector_is_valid(except->exceptIndex)){ + return 0; + } + /* + * Check if handler passed is actually connected. If not issue an error. + * You must first get the current handler via mpc5xx_get_current_exception + * and then disconnect it using mpc5xx_delete_exception. + * RATIONALE : to always have the same transition by forcing the user + * to get the previous handler before accepting to disconnect. + */ + if (exception_handler_table[except->exceptIndex] != except->hdl.raw_hdl) { + return 0; + } + + rtems_interrupt_disable(level); + + if (except->off) + except->off(except); + exception_handler_table[except->exceptIndex] = + default_raw_except_entry.hdl.raw_hdl; + + raw_except_table[except->exceptIndex] = default_raw_except_entry; + raw_except_table[except->exceptIndex].exceptIndex = except->exceptIndex; + + rtems_interrupt_enable(level); + + return 1; +} + +/* + * Exception global init. + * + * Install exception handler pointers from the raw exception table into the + * exception handler table. + */ +int mpc5xx_init_exceptions (rtems_raw_except_global_settings* config) +{ + unsigned i; + rtems_interrupt_level level; + + /* + * store various accelerators + */ + raw_except_table = config->rawExceptHdlTbl; + local_settings = config; + default_raw_except_entry = config->defaultRawEntry; + + rtems_interrupt_disable(level); + + for (i = 0; i < NUM_EXCEPTIONS; i++) { + exception_handler_table[i] = raw_except_table[i].hdl.raw_hdl; + + if (raw_except_table[i].hdl.raw_hdl != default_raw_except_entry.hdl.raw_hdl) { + if (raw_except_table[i].on) + raw_except_table[i].on(&raw_except_table[i]); + } + else { + if (raw_except_table[i].off) + raw_except_table[i].off(&raw_except_table[i]); + } + } + rtems_interrupt_enable(level); + + return 1; +} + +int mpc5xx_get_exception_config (rtems_raw_except_global_settings** config) +{ + *config = local_settings; + return 1; +} |