From: Hugo Villeneuve Date: Mon, 28 Oct 2013 02:48:24 +0000 (-0400) Subject: Refactor code to read/write different memory types X-Git-Tag: v2.0.0~105 X-Git-Url: http://gitweb.hugovil.com/?a=commitdiff_plain;h=593009d28f70be7e5deebc7a44c16e85c2574422;p=emu8051.git Refactor code to read/write different memory types Dynamic memory buffers allocation depending on sizes specified with command-line options. Add future support for separate IRAM and SFR buffers. --- diff --git a/src/cpu8051.c b/src/cpu8051.c index b83175d..a44cd7f 100644 --- a/src/cpu8051.c +++ b/src/cpu8051.c @@ -95,6 +95,8 @@ ToggleBreakpoint(unsigned int address) void cpu8051_init(void) { + memory_init(); + cpu8051.pc = 0; cpu8051.clock = 0; cpu8051.active_priority = -1; @@ -105,24 +107,18 @@ cpu8051_init(void) void cpu8051_Reset(void) { - int i; - cpu8051.pc = 0; cpu8051.clock = 0; cpu8051.active_priority = -1; - /* Reset registers */ - - for (i = 0; i < 256; i++) { - /* Clear IRAM and SFR */ - memory_write8(INT_MEM_ID, i, 0); - } + /* Clear IRAM and SFR. */ + memory_clear(INT_MEM_ID); - memory_write8(INT_MEM_ID, _P0_, 0xFF); - memory_write8(INT_MEM_ID, _P1_, 0xFF); - memory_write8(INT_MEM_ID, _P2_, 0xFF); - memory_write8(INT_MEM_ID, _P3_, 0xFF); - memory_write8(INT_MEM_ID, _SP_, 0x07); + memory_sfr_write8(_P0_, 0xFF); + memory_sfr_write8(_P1_, 0xFF); + memory_sfr_write8(_P2_, 0xFF); + memory_sfr_write8(_P3_, 0xFF); + memory_sfr_write8(_SP_, 0x07); } static void diff --git a/src/memory.c b/src/memory.c index c748cfe..fec85c1 100644 --- a/src/memory.c +++ b/src/memory.c @@ -26,81 +26,95 @@ #include "cpu8051.h" #include "hexfile.h" #include "memory.h" +#include "options.h" -static u_int8_t pgm_mem[PGM_MEM_MAX_SIZE]; -static u_int8_t int_mem[INT_MEM_MAX_SIZE]; -static u_int8_t ext_mem[EXT_MEM_MAX_SIZE]; +struct mem_infos_t { + int size; + int max_size; + u_int8_t *buf; +}; + +struct mem_infos_t mem_infos[MEM_ID_COUNT]; +extern struct options_t options; + +/* Init each 8051 memory sections. */ void -memory_write8(int memory_id, unsigned long address, u_int8_t value) +memory_init(void) { - switch (memory_id) { - case PGM_MEM_ID: - if (address >= PGM_MEM_MAX_SIZE) { - printf("Address (%lu) is greater than PGM_MEM_MAX_SIZE\n", - address); - return; - } else - pgm_mem[address] = value; - break; - case INT_MEM_ID: - if (address >= INT_MEM_MAX_SIZE) { - printf("Address (%lu) is greater than INT_MEM_MAX_SIZE\n", - address); - return; - } else - int_mem[address] = value; - break; - case EXT_MEM_ID: - if (address >= EXT_MEM_MAX_SIZE) { - printf("Address (%lu) is greater than EXT_MEM_MAX_SIZE\n", - address); - return; - } else - ext_mem[address] = value; - break; - default: - /* Error. */ - break; + int k; + struct mem_infos_t *m; + + /* Set desired and maximum allowable sizes for each memory type. */ + mem_infos[PGM_MEM_ID].size = options.pram_size; + mem_infos[PGM_MEM_ID].max_size = PGM_MEM_MAX_SIZE; + + mem_infos[INT_MEM_ID].size = options.iram_size; + mem_infos[INT_MEM_ID].max_size = INT_MEM_MAX_SIZE; + + mem_infos[EXT_MEM_ID].size = options.xram_size; + mem_infos[EXT_MEM_ID].max_size = EXT_MEM_MAX_SIZE; + + /* Verify if desired sizes are valid, and if so allocate memory. */ + for (k = 0; k < MEM_ID_COUNT; k++) { + m = &mem_infos[k]; + + if (m->size > m->max_size) { + log_fail_no_exit("Memory size invalid (max = %d)", + m->max_size); + exit(1); + } + + m->buf = malloc(m->size); + if (m->buf == NULL) { + log_fail_no_exit("%s", strerror(errno)); + exit(1); + } } } +void +memory_clear(enum mem_id_t id) +{ + memset(mem_infos[id].buf, 0, mem_infos[id].size); +} + +void +memory_write8(enum mem_id_t id, unsigned long address, u_int8_t value) +{ + if (address >= mem_infos[id].max_size) { + printf("Error writing to memory ID: %d\n", id); + printf(" Address (%lu) greater than maximum memory size\n", + address); + return; + } else + mem_infos[id].buf[address] = value; +} + +void +memory_sfr_write8(unsigned long address, u_int8_t value) +{ + /* SFR registers are from addresses $80 to $FF. */ + memory_write8(INT_MEM_ID, address, value); +} + u_int8_t -memory_read8(int memory_id, unsigned long address) +memory_read8(enum mem_id_t id, unsigned long address) { - switch (memory_id) { - case PGM_MEM_ID: - if (address < PGM_MEM_MAX_SIZE) - return pgm_mem[address]; - else { - printf("Address (%lu) is greater than PGM_MEM_MAX_SIZE\n", - address); - return 0; - } - break; - case INT_MEM_ID: - if (address < INT_MEM_MAX_SIZE) - return int_mem[address]; - else { - printf("Address (%lu) is greater than INT_MEM_MAX_SIZE\n", - address); - return 0; - } - break; - case EXT_MEM_ID: - if (address < EXT_MEM_MAX_SIZE) - return ext_mem[address]; - else { - printf("Address (%lu) is greater than EXT_MEM_MAX_SIZE\n", - address); - return 0; - } - break; - default: - /* Error. */ + if (address >= mem_infos[id].max_size) { + printf("Error reading from memory ID: %d\n", id); + printf(" Address (%lu) greater than maximum memory size\n", + address); return 0; - break; - } + } else + return mem_infos[id].buf[address]; +} + +u_int8_t +memory_sfr_read8(unsigned long address) +{ + /* SFR registers are from addresses $80 to $FF. */ + return memory_read8(INT_MEM_ID, address); } /* Dump memory */ diff --git a/src/memory.h b/src/memory.h index d5e426d..9064813 100644 --- a/src/memory.h +++ b/src/memory.h @@ -33,19 +33,33 @@ #define INT_MEM_MAX_SIZE 256 #define EXT_MEM_MAX_SIZE 65536 +#define PGM_MEM_DEFAULT_SIZE 8192 #define EXT_MEM_DEFAULT_SIZE 1024 -enum { - PGM_MEM_ID, - INT_MEM_ID, - EXT_MEM_ID +enum mem_id_t { + PGM_MEM_ID, + INT_MEM_ID, + EXT_MEM_ID, + MEM_ID_COUNT }; void -memory_write8(int memory_id, unsigned long address, u_int8_t value); +memory_init(void); + +void +memory_clear(enum mem_id_t id); + +void +memory_write8(enum mem_id_t id, unsigned long address, u_int8_t value); + +void +memory_sfr_write8(unsigned long address, u_int8_t value); + +u_int8_t +memory_read8(enum mem_id_t id, unsigned long address); u_int8_t -memory_read8(int memory_id, unsigned long address); +memory_sfr_read8(unsigned long address); void DumpMem(char *Address, char *Asize, int memory_id); diff --git a/src/options.c b/src/options.c index 3616f51..3c292d4 100644 --- a/src/options.c +++ b/src/options.c @@ -83,29 +83,25 @@ static void decode_memory_size(char *arg, struct argp_state *state, int memid) { char *endptr; - int max_size; int *dest; - if (memid == INT_MEM_ID) { - max_size = INT_MEM_MAX_SIZE; + if (memid == INT_MEM_ID) dest = &options.iram_size; - } else { - max_size = EXT_MEM_MAX_SIZE; + else if (memid == EXT_MEM_ID) dest = &options.xram_size; - } + else + exit(1); /* Programming error. */ + /* + * Sizes versus max memory sizes will be checked when calling + * memory_init(). + */ *dest = strtol(arg, &endptr, 0); if (*endptr != '\0') { log_fail_no_exit("Invalid memory size"); argp_usage(state); } - - if (*dest > max_size) { - log_fail_no_exit("Invalid maximum memory size (max = %d)", - max_size); - argp_usage(state); - } } /* Parse a single option. */ diff --git a/src/regwin.c b/src/regwin.c index e549c96..e5708f2 100644 --- a/src/regwin.c +++ b/src/regwin.c @@ -28,6 +28,7 @@ #include "common.h" #include "reg8051.h" #include "cpu8051.h" +#include "memory.h" #include "regwin.h" #include "memwin.h" #include "pgmwin.h" @@ -62,11 +63,11 @@ static unsigned int regwin_read(int addr, int width) { if (width == 2) - return cpu8051_ReadD(addr); + return memory_sfr_read8(addr); else if (width == 4) { /* Address is low address. */ - return (cpu8051_ReadD(addr + 1) << 8) | - cpu8051_ReadD(addr); + return (memory_sfr_read8(addr + 1) << 8) | + memory_sfr_read8(addr); } else return 0xFFFFFFFF; } @@ -75,11 +76,11 @@ static void regwin_write(int addr, int val, int width) { if (width == 2) - cpu8051_WriteD(addr, (u_int8_t) val); + memory_sfr_write8(addr, (u_int8_t) val); else if (width == 4) { /* Address is low address. */ - cpu8051_WriteD(addr + 1, (u_int8_t) ((val & 0x0000FFFF) >> 8)); - cpu8051_WriteD(addr, (u_int8_t) val); + memory_sfr_write8(addr + 1, (u_int8_t) ((val & 0x0000FFFF) >> 8)); + memory_sfr_write8(addr, (u_int8_t) val); } }; @@ -100,47 +101,54 @@ regwin_write_pc(int param, int val) static unsigned int regwin_read_timer(int timer_low_addr) { - return (cpu8051_ReadD(timer_low_addr + 2) << 8) | - cpu8051_ReadD(timer_low_addr); + return (memory_sfr_read8(timer_low_addr + 2) << 8) | + memory_sfr_read8(timer_low_addr); } static void regwin_write_timer(int timer_low_addr, int val) { - cpu8051_WriteD(timer_low_addr + 2, (u_int8_t) ((val & 0x0000FFFF) >> 8)); - cpu8051_WriteD(timer_low_addr, (u_int8_t) val); + memory_sfr_write8(timer_low_addr + 2, (u_int8_t) ((val & 0x0000FFFF) >> 8)); + memory_sfr_write8(timer_low_addr, (u_int8_t) val); +} + +static u_int8_t +regwin_read_bank_offset(void) +{ + return memory_sfr_read8(_PSW_) & 0x18; } static unsigned int regwin_read_bank(int dummy) { - return BANKPSW >> 3; + return regwin_read_bank_offset() >> 3; } static void regwin_write_bank(int param, int bank_number) { - u_int8_t psw = cpu8051_ReadD(_PSW_); + u_int8_t psw = memory_sfr_read8(_PSW_); if ((bank_number < 0) || (bank_number > 3)) { log_info("Error: invalid bank number: %d", bank_number); bank_number = 0; } - cpu8051_WriteD(_PSW_, (psw & ~0x18) | (bank_number << 3)); + memory_sfr_write8(_PSW_, (psw & ~0x18) | (bank_number << 3)); } -/* Read R0 - R7 in current bank. */ +/* Indirect read of R0 - R7 in current bank from internal memory. */ static unsigned int regwin_read_rx(int offset) { - return cpu8051_ReadD(BANKPSW + offset); + return memory_read8(INT_MEM_ID, regwin_read_bank_offset() + offset); } +/* Indirect write to R0 - R7 in current bank to internal memory. */ static void regwin_write_rx(int offset, int val) { - cpu8051_WriteD(BANKPSW + offset, (u_int8_t) val); + memory_write8(INT_MEM_ID, regwin_read_bank_offset() + offset, (u_int8_t) val); } /* This array defines how to read value for each register. */