#endif
#include "device_table.h"
-#include "cpu.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
#define WITH_STDIO DO_USE_STDIO
#endif
-/* Device:
-
- pal@<address>
+/* DEVICE
+ pal - glue logic device containing assorted junk
- Description:
+ 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].
+ doesn't).
+
+ The pal contains the following registers. Except for the interrupt
+ level register, each of the below is 8 bytes in size and must be
+ accessed using correct alignment. For 16 and 32 bit accesses the
+ bytes not directed to the register are ignored:
- <address> + 12: read - nr processors in byte[0].
+ |0 reset register (write)
+ |4 processor id register (read)
+ |8 interrupt port (write)
+ |9 interrupt level (write)
+ |12 processor count register (read)
+ |16 tty input fifo register (read)
+ |20 tty input status register (read)
+ |24 tty output fifo register (write)
+ |28 tty output status register (read)
+
+ Reset register (write) halts the simulator exiting with the
+ value written.
+ Processor id register (read) returns the processor number (0
+ .. N-1) of the processor performing the read.
- Properties:
+ The interrupt registers should be accessed as a pair (using a 16 or
+ 32 bit store). The low byte specifies the interrupt port while the
+ high byte specifies the level to drive that port at. By
+ convention, the pal's interrupt ports (int0, int1, ...) are wired
+ up to the corresponding processor's level sensative external
+ interrupt pin. Eg: A two byte write to address 8 of 0x0102
+ (big-endian) will result in processor 2's external interrupt pin to
+ be asserted.
+
+ Processor count register (read) returns the total number of
+ processors active in the current simulation.
+
+ TTY input fifo register (read), if the TTY input status register
+ indicates a character is available by being nonzero, returns the
+ next available character from the pal's tty input port.
+
+ Similarly, the TTY output fifo register (write), if the TTY output
+ status register indicates the output fifo is not full by being
+ nonzero, outputs the character written to the tty's output port.
+
+ PROPERTIES
- NONE. */
+ reg = <address> <size> (required)
+
+ Specify the address (within the parent bus) that this device is to
+ live.
+
+ */
enum {
/* 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)
return i;
}
+static const device_instance_callbacks hw_pal_instance_callbacks = {
+ hw_pal_instance_delete_callback,
+ hw_pal_instance_read_callback,
+ hw_pal_instance_write_callback,
+};
+
+static device_instance *
+hw_pal_create_instance(device *me,
+ const char *path,
+ const char *args)
+{
+ return device_create_instance_from(me, NULL,
+ device_data(me),
+ path, args,
+ &hw_pal_instance_callbacks);
+}
+
+static const device_interrupt_port_descriptor hw_pal_interrupt_ports[] = {
+ { "int", 0, MAX_NR_PROCESSORS },
+ { NULL }
+};
+
+
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, NULL, hw_pal_interrupt_ports }, /* interrupt */
{ NULL, }, /* unit */
- { hw_pal_instance_create_callback,
- hw_pal_instance_delete_callback,
- hw_pal_instance_read_callback,
- hw_pal_instance_write_callback, },
+ hw_pal_create_instance,
};
static void *
hw_pal_create(const char *name,
const device_unit *unit_address,
- const char *args,
- device *parent)
+ const char *args)
{
/* create the descriptor */
hw_pal_device *hw_pal = ZALLOC(hw_pal_device);
projects / deliverable / binutils-gdb.git / blobdiff