ecos_bsp.c

eCos操作系统源码

//==========================================================================
//
//        ecos_bsp.c
//
//        eCos BSP (for building Cygmon)
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):     gthomas
// Contributors:  gthomas, dmoseley
// Date:          1999-10-11
// Description:   Wrapper functions which provide BSP environment for Cygmon
//####DESCRIPTIONEND####

#ifdef CYGPKG_KERNEL
#include <pkgconf/kernel.h>   // Configuration headers
#endif
#include <pkgconf/hal.h>
#include <pkgconf/cygmon.h>

#include <cyg/hal/hal_arch.h>
#include <cyg/hal/hal_cache.h>
#ifdef CYGPKG_KERNEL
#include <cyg/kernel/kapi.h>
#else
#include <cyg/hal/drv_api.h>
#include <cyg/hal/hal_intr.h>
#endif
#include <cyg/infra/diag.h>
#include "bsp/common/bsp_if.h"
#include <cyg/hal/hal_if.h>
#include <signal.h>
#include CYGHWR_MEMORY_LAYOUT_H
 
#include <pkgconf/system.h>
#ifdef CYGPKG_IO
#include <cyg/io/io.h>
#include <cyg/io/serialio.h>
#endif

#define STACK_SIZE CYGNUM_HAL_STACK_SIZE_MINIMUM
static char stack[STACK_SIZE];
#ifdef CYGPKG_KERNEL
static cyg_thread thread_data;
static cyg_handle_t thread_handle;
#endif

char *build_date = __DATE__;

extern void monitor_main(int, char *);
extern int  stub_is_active;

void ecos_bsp_set_memsize(unsigned long size);

void
cygmon_main(void)
{
    _bsp_init();
    monitor_main(0, 0);  // Null argument list
}

extern unsigned long cygmon_memsize;

externC void
cyg_start( void )
{
    // Fill in the BSP memory info
    if (cygmon_memsize != 0)
        ecos_bsp_set_memsize(cygmon_memsize);

#ifdef CYGPKG_KERNEL
    // Create a main thread, so we can run the scheduler and have time 'pass'
    cyg_thread_create(10,                // Priority - just a number
                      (cyg_thread_entry_t*)cygmon_main,       // entry
                      0,                 // entry parameter
                      "Cygmon",          // Name
                      &stack[0],         // Stack
                      STACK_SIZE,        // Size
                      &thread_handle,    // Handle
                      &thread_data       // Thread data structure
            );
    cyg_thread_resume(thread_handle);  // Start it
    cyg_scheduler_start();
#else
#ifdef HAL_ARCH_FUNCALL_NEW_STACK
    HAL_ARCH_FUNCALL_NEW_STACK(cygmon_main, &stack[0], STACK_SIZE);
#else
    #error Need to define HAL_ARCH_FUNCALL_NEW_STACK
#endif
#endif
} // cyg_package_start()

#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
extern void *_hal_registers;  // Used by eCos GDB stubs
extern void (*__init_vec)(void);
extern void (*__cleanup_vec)(void);
extern void __install_traps(void);
#endif

extern int machine_syscall(HAL_SavedRegisters *regs);
void
_bsp_handle_exception(cyg_addrword_t data, cyg_code_t num, cyg_addrword_t info)
{
    if (num == CYGNUM_HAL_EXCEPTION_INTERRUPT) {
        if (machine_syscall((HAL_SavedRegisters*)info)) {
            return;
        }
        // Fall through to "normal" exception handling if system call failed
    }
#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
    _hal_registers = (void *)info;  // Used by eCos GDB stubs
    __cleanup_vec();
#endif
    bsp_invoke_dbg_handler(num, (void *)info);
#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
    __init_vec();
#endif
}

#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
extern void __handle_exception(void);
#else

int
unhandled_exception(int num, void *args)
{
    diag_printf("Unhandled exception: %d/%x\n", num, args);
    while (1) ;
}
#endif

void
_bsp_cpu_init(void)
{
#ifdef CYGPKG_KERNEL
    int d0;
    cyg_exception_set_handler(CYGNUM_HAL_EXCEPTION_ILLEGAL_INSTRUCTION,
                              _bsp_handle_exception,
                              (cyg_addrword_t)&d0,
                              0,
                              0);
#endif
#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
    bsp_install_dbg_handler((bsp_handler_t)__handle_exception);
    __install_traps();
#else
    bsp_install_dbg_handler(unhandled_exception);
#endif
}

#define FAIL() diag_printf("fail: %s\n", __FUNCTION__);  while (1) ;

#ifndef CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT

struct BSP_IO {
    char            *name;
    cyg_io_handle_t  chan;
};

static void 
uart_putchar(void *base, char c)
{
    char buf;
    int len;
    struct BSP_IO *io = (struct BSP_IO *)base;
    if (io->chan) {
        len = 1;
        buf = c;
        cyg_io_write(io->chan, &buf, &len);
    }
}

extern int __output_gdb_string (const char *str, int string_len);

// This function is mostly used by the 'write()' system call
static void
uart_write(void *base, const char *buf, int len)
{
    struct BSP_IO *io = (struct BSP_IO *)base;
    if (io->chan) {
        if (stub_is_active) {
            // We are running in 'GDB' mode
            __output_gdb_string(buf, len);
        } else {
            cyg_io_write(io->chan, buf, &len);
        }
    }
}

static int
uart_read(void *base, char *buf, int len)
{
    struct BSP_IO *io = (struct BSP_IO *)base;
    if (io->chan) {
        cyg_io_read(io->chan, buf, &len);
        return len;
    }
    return 0;
}

static int
uart_getchar(void *base)
{
    char buf = '\0';
    int len;
    struct BSP_IO *io = (struct BSP_IO *)base;
    if (io->chan) {
        len = 1;
        cyg_io_read(io->chan, &buf, &len);
    }
    return buf;
}

static int
uart_control(void *base, int func, ...)
{
    int rc = 0;
    va_list ap;
    int arg;
    struct BSP_IO *io = (struct BSP_IO *)base;

    va_start(ap, func);

    if (func == COMMCTL_SETBAUD)
    {
        cyg_serial_info_t buffer = {
            CYG_SERIAL_BAUD_DEFAULT, 
            CYG_SERIAL_STOP_DEFAULT, 
            CYG_SERIAL_PARITY_DEFAULT,
            CYG_SERIAL_WORD_LENGTH_DEFAULT,
            CYG_SERIAL_FLAGS_DEFAULT
        };
        int len = sizeof(buffer);
        arg = va_arg(ap, int);

        switch (arg)
        {
        case 50:         buffer.baud = CYG_SERIAL_BAUD_RATE(50);       break;
        case 75:         buffer.baud = CYG_SERIAL_BAUD_RATE(75);       break;
        case 110:        buffer.baud = CYG_SERIAL_BAUD_RATE(110);      break;
        case 134:        buffer.baud = CYG_SERIAL_BAUD_RATE(134_5);    break;
        case 135:        buffer.baud = CYG_SERIAL_BAUD_RATE(134_5);    break;
        case 150:        buffer.baud = CYG_SERIAL_BAUD_RATE(150);      break;
        case 200:        buffer.baud = CYG_SERIAL_BAUD_RATE(200);      break;
        case 300:        buffer.baud = CYG_SERIAL_BAUD_RATE(300);      break;
        case 600:        buffer.baud = CYG_SERIAL_BAUD_RATE(600);      break;
        case 1200:       buffer.baud = CYG_SERIAL_BAUD_RATE(1200);     break;
        case 1800:       buffer.baud = CYG_SERIAL_BAUD_RATE(1800);     break;
        case 2400:       buffer.baud = CYG_SERIAL_BAUD_RATE(2400);     break;
        case 3600:       buffer.baud = CYG_SERIAL_BAUD_RATE(3600);     break;
        case 4800:       buffer.baud = CYG_SERIAL_BAUD_RATE(4800);     break;
        case 7200:       buffer.baud = CYG_SERIAL_BAUD_RATE(7200);     break;
        case 9600:       buffer.baud = CYG_SERIAL_BAUD_RATE(9600);     break;
        case 14400:      buffer.baud = CYG_SERIAL_BAUD_RATE(14400);    break;
        case 19200:      buffer.baud = CYG_SERIAL_BAUD_RATE(19200);    break;
        case 38400:      buffer.baud = CYG_SERIAL_BAUD_RATE(38400);    break;
        case 57600:      buffer.baud = CYG_SERIAL_BAUD_RATE(57600);    break;
        case 115200:     buffer.baud = CYG_SERIAL_BAUD_RATE(115200);   break;
        case 230400:     buffer.baud = CYG_SERIAL_BAUD_RATE(230400);   break;
        default:         buffer.baud = -1; rc = -1;                    break;
        }

        if ((io->chan) && (buffer.baud != -1)) {
            rc = cyg_io_set_config(io->chan, CYG_IO_SET_CONFIG_SERIAL_INFO, &buffer, &len);
        }
    }

    va_end(ap);
    return rc;
}

/*
 * Setup the bsp_comm_channel data structure
 */
struct BSP_IO bsp_comm_io[] = { 
    {CYGDAT_CYGMON_CONSOLE_DEV, 0},  // Console device
};

struct bsp_comm_channel _bsp_comm_list[] = 
{
    {
	{ "UART 0", 
          BSP_COMM_SERIAL, 
          BSP_PROTO_NONE },
	{ (void*)&bsp_comm_io[0], 
          uart_write, 
          uart_read,
	  uart_putchar, 
          uart_getchar, 
          uart_control }
    },
};
int _bsp_num_comms = sizeof(_bsp_comm_list)/sizeof(_bsp_comm_list[0]);

void
_bsp_init_board_comm(void)
{
    int i;
    for (i = 0;  i < _bsp_num_comms;  i++) {
        Cyg_ErrNo err;
        struct BSP_IO *io;
        io = (struct BSP_IO *)_bsp_comm_list[i].procs.ch_data;
        if ((err = cyg_io_lookup(io->name, &io->chan)) != ENOERR) {
            diag_printf("Can't open '%s'\n", io->name);
        }
    }
}

#else // CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT

struct bsp_comm_channel _bsp_comm_list[1];
int _bsp_num_comms = 1;

// Yuck! Two things need doing:

// FIXME: Make bsp code use pointers in the bsp_comm_channel instead
//        of sub-structures.

// FIXME: Make HAL provide the bsp_comm_info structure - I missed that
//        initially because it cannot be accessed via the virtual table API.
void
_bsp_init_board_comm(void)
{
    struct bsp_comm_channel* channel;
    hal_virtual_comm_table_t* comm;

    channel = &_bsp_comm_list[0];
    channel->info.name = "fixme";
    channel->info.kind = BSP_COMM_SERIAL;
    channel->info.protocol = BSP_PROTO_NONE;

    comm = CYGACC_CALL_IF_DEBUG_PROCS();
    channel->procs = *(struct bsp_comm_procs*)comm;
}
#endif // CYGSEM_HAL_VIRTUAL_VECTOR_SUPPORT

/*
 * Array of memory region descriptors. We just list RAM.
 */
#ifdef CYGMEM_REGION_ram
#define RAM_VIRTUAL_BASE CYGMEM_REGION_ram
#define RAM_TOTAL_SIZE   CYGMEM_REGION_ram_SIZE
#else
#define RAM_VIRTUAL_BASE 0x00008000
#define RAM_TOTAL_SIZE   0x00FF8000
#endif

struct bsp_mem_info _bsp_memory_list[] = 
{
    { (void *)RAM_VIRTUAL_BASE,   
      (void *)RAM_VIRTUAL_BASE,   
      0, 
      RAM_TOTAL_SIZE,   
      BSP_MEM_RAM 
    },
};

/*
 * Number of memory region descriptors.
 */
int _bsp_num_mem_regions = sizeof(_bsp_memory_list)/sizeof(_bsp_memory_list[0]);

void
_bsp_install_cpu_irq_controllers(void)
{
}

void
_bsp_install_board_irq_controllers(void)
{
}

void
__init_irq_controllers(void)
{
}

void
_bsp_board_init(void)
{
    /*
     * Define platform info.
     */
#ifdef HAL_PLATFORM_CPU
    _bsp_platform_info.cpu = HAL_PLATFORM_CPU;
#else
    _bsp_platform_info.cpu = "Unknown CPU";
#endif
#ifdef HAL_PLATFORM_BOARD
    _bsp_platform_info.board = HAL_PLATFORM_BOARD;
#else
    _bsp_platform_info.board = "Unknown board";
#endif
#ifdef HAL_PLATFORM_EXTRA
    _bsp_platform_info.extra = HAL_PLATFORM_EXTRA;
#else
    _bsp_platform_info.extra = "";
#endif
}

extern char *strchr(char *, char);
char *
index(char *string, char key)
{
    return strchr(string, key);
}

void
flush_i_cache(void)
{
    HAL_ICACHE_SYNC();
}

void
ecos_bsp_console_putc(char c)
{
    if (bsp_shared_data) {
        bsp_console_putc(c);
    }
}

char
ecos_bsp_console_getc(void)
{
    if (bsp_shared_data) {
        return bsp_console_getc();
    } else {
        return '?';
    }
}

void
ecos_bsp_set_memsize(unsigned long size)
{
    _bsp_memory_list[0].nbytes = size;
}