diff options
Diffstat (limited to 'sim')
| -rw-r--r-- | sim/ppc/ChangeLog | 6 | ||||
| -rw-r--r-- | sim/ppc/hw_pal.c | 337 |
2 files changed, 343 insertions, 0 deletions
diff --git a/sim/ppc/ChangeLog b/sim/ppc/ChangeLog index 3376810..788a148 100644 --- a/sim/ppc/ChangeLog +++ b/sim/ppc/ChangeLog @@ -1,3 +1,9 @@ +Mon May 6 11:31:43 1996 Michael Meissner <meissner@tiktok.cygnus.com> + + * hw_pal.c (hw_pal_instance_read_callback): If using stdio, use + fgets to read line. If not using stdio, do a simple blocking read + of len bytes. + Fri May 3 15:07:42 1996 Michael Meissner <meissner@tiktok.cygnus.com> * Makefile.in: Correctly build simulator for build machine != host diff --git a/sim/ppc/hw_pal.c b/sim/ppc/hw_pal.c new file mode 100644 index 0000000..dd5a097 --- /dev/null +++ b/sim/ppc/hw_pal.c @@ -0,0 +1,337 @@ +/* This file is part of the program psim. + + Copyright (C) 1994-1996, Andrew Cagney <cagney@highland.com.au> + + This program 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 of the License, or + (at your option) any later version. + + This program 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 this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + */ + + +#ifndef _HW_PAL_C_ +#define _HW_PAL_C_ + +#ifndef STATIC_INLINE_HW_PAL +#define STATIC_INLINE_HW_PAL STATIC_INLINE +#endif + +#include "device_table.h" +#include "cpu.h" + + +#include <stdio.h> +#include <fcntl.h> + +#if 0 +#ifdef HAVE_TIME_H +#include <time.h> +#endif +#endif + +#ifdef HAVE_STRING_H +#include <string.h> +#else +#ifdef HAVE_STRINGS_H +#include <strings.h> +#endif +#endif + +#ifdef HAVE_UNISTD_H +#include <unistd.h> +#endif +#ifdef HAVE_STDLIB_H +#include <stdlib.h> +#endif + + +/* Device: + + pal@<address> + + + Description: + + Typical hardware dependant hack. This device allows the firmware + to gain access to all the things the firmware needs (but the OS + doesn't). All registers are little endian (byte 0 is the least + significant) and must be accessed correctly aligned. + + <address> + 0: write - halts simulation with exit code byte[0]. + + <address> + 4: read - processor nr in byte[0]. + + <address> + 8: write - send interrupt message to port byte[0] with + value byte[1]. + + <address> + 12: read - nr processors in byte[0]. + + + Properties: + + NONE. */ + + +enum { + hw_pal_reset_register = 0x0, + hw_pal_cpu_nr_register = 0x4, + hw_pal_int_register = 0x8, + hw_pal_nr_cpu_register = 0xa, + hw_pal_read_fifo = 0x10, + hw_pal_read_status = 0x14, + hw_pal_write_fifo = 0x18, + hw_pal_write_status = 0x1a, + hw_pal_address_mask = 0x1f, +}; + + +typedef struct _hw_pal_console_buffer { + char buffer; + int status; +} hw_pal_console_buffer; + +typedef struct _hw_pal_device { + hw_pal_console_buffer input; + hw_pal_console_buffer output; +} hw_pal_device; + + +/* check the console for an available character */ +static void +scan_hw_pal(hw_pal_device *hw_pal) +{ + if (WITH_STDIO == DO_USE_STDIO) { + int c = getchar (); + if (c == EOF) { + hw_pal->input.buffer = 0; + hw_pal->input.status = 0; + } else { + hw_pal->input.buffer = c; + hw_pal->input.status = 1; + } + + } else { + /* check for input */ + int flags; + int status; + /* get the old status */ + flags = fcntl(0, F_GETFL, 0); + if (flags == -1) { + perror("hw_pal"); + return; + } + /* temp, disable blocking IO */ + status = fcntl(0, F_SETFL, flags | O_NDELAY); + if (status == -1) { + perror("hw_pal"); + return; + } + /* try for input */ + status = read(0, &hw_pal->input.buffer, 1); + if (status == 1) { + hw_pal->input.status = 1; + } + else { + hw_pal->input.status = 0; + } + /* return to regular vewing */ + flags = fcntl(0, F_SETFL, flags); + if (flags == -1) { + perror("hw_pal"); + return; + } + } +} + +/* write the character to the hw_pal */ +static void +write_hw_pal(hw_pal_device *hw_pal, + char val) +{ + if (WITH_STDIO == DO_USE_STDIO) { + putchar (val); + + } else { + printf_filtered("%c", val) ; + } + + hw_pal->output.buffer = val; + hw_pal->output.status = 1; +} + + +static unsigned +hw_pal_io_read_buffer_callback(device *me, + void *dest, + int space, + unsigned_word addr, + unsigned nr_bytes, + cpu *processor, + unsigned_word cia) +{ + hw_pal_device *hw_pal = (hw_pal_device*)device_data(me); + unsigned_1 val; + switch (addr & hw_pal_address_mask) { + case hw_pal_cpu_nr_register: + val = cpu_nr(processor); + break; + case hw_pal_nr_cpu_register: + val = device_find_integer_property(me, "/openprom/options/smp"); + break; + case hw_pal_read_fifo: + val = hw_pal->input.buffer; + break; + case hw_pal_read_status: + scan_hw_pal(hw_pal); + val = hw_pal->input.status; + break; + case hw_pal_write_fifo: + val = hw_pal->output.buffer; + break; + case hw_pal_write_status: + val = hw_pal->output.status; + break; + default: + val = 0; + } + memset(dest, 0, nr_bytes); + *(unsigned_1*)dest = val; + return nr_bytes; +} + + +static unsigned +hw_pal_io_write_buffer_callback(device *me, + const void *source, + int space, + unsigned_word addr, + unsigned nr_bytes, + cpu *processor, + unsigned_word cia) +{ + hw_pal_device *hw_pal = (hw_pal_device*)device_data(me); + unsigned_1 *byte = (unsigned_1*)source; + + switch (addr & hw_pal_address_mask) { + case hw_pal_reset_register: + cpu_halt(processor, cia, was_exited, byte[0]); + break; + case hw_pal_int_register: + device_interrupt_event(me, + byte[0], /*port*/ + (nr_bytes > 1 ? byte[1] : 0), /* val */ + processor, cia); + break; + case hw_pal_read_fifo: + hw_pal->input.buffer = byte[0]; + break; + case hw_pal_read_status: + hw_pal->input.status = byte[0]; + break; + case hw_pal_write_fifo: + write_hw_pal(hw_pal, byte[0]); + break; + case hw_pal_write_status: + hw_pal->output.status = byte[0]; + break; + } + return nr_bytes; +} + + +/* instances of the hw_pal device */ +static void * +hw_pal_instance_create_callback(device *me, + const char *args) +{ + /* make life easier, attach the hw_pal data to the instance */ + return device_data(me); +} + +static void +hw_pal_instance_delete_callback(device_instance *instance) +{ + /* nothing to delete, the hw_pal is attached to the device */ + return; +} + +static int +hw_pal_instance_read_callback(device_instance *instance, + void *buf, + unsigned_word len) +{ + char *buf_char = (char *)buf; + hw_pal_device *hw_pal = device_instance_data(instance); + if (WITH_STDIO == DO_USE_STDIO) { + char *line = fgets (buf_char, len, stdin); + return ((!line) ? -1 : strlen (buf_char)); + + } else { + return read(0, buf_char, len); + } +} + +static int +hw_pal_instance_write_callback(device_instance *instance, + const void *buf, + unsigned_word len) +{ + int i; + const char *chp = buf; + hw_pal_device *hw_pal = device_instance_data(instance); + for (i = 0; i < len; i++) + write_hw_pal(hw_pal, chp[i]); + + if (WITH_STDIO == DO_USE_STDIO) { + fflush (stdout); + } + return i; +} + +static device_callbacks const hw_pal_callbacks = { + { generic_device_init_address, }, + { NULL, }, /* address */ + { hw_pal_io_read_buffer_callback, + hw_pal_io_write_buffer_callback, }, + { NULL, }, /* DMA */ + { NULL, }, /* interrupt */ + { NULL, }, /* unit */ + { hw_pal_instance_create_callback, + hw_pal_instance_delete_callback, + hw_pal_instance_read_callback, + hw_pal_instance_write_callback, }, +}; + + +static void * +hw_pal_create(const char *name, + const device_unit *unit_address, + const char *args, + device *parent) +{ + /* create the descriptor */ + hw_pal_device *hw_pal = ZALLOC(hw_pal_device); + hw_pal->output.status = 1; + hw_pal->output.buffer = '\0'; + hw_pal->input.status = 0; + hw_pal->input.buffer = '\0'; + return hw_pal; +} + + +const device_descriptor hw_pal_device_descriptor[] = { + { "pal", hw_pal_create, &hw_pal_callbacks }, + { NULL }, +}; + +#endif /* _HW_PAL_C_ */ |