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/* interrupts.h -- 68HC11 Interrupts Emulation
Copyright 1999-2024 Free Software Foundation, Inc.
Written by Stephane Carrez (stcarrez@worldnet.fr)
This file is part of GDB, GAS, and the GNU binutils.
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 3 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, see <http://www.gnu.org/licenses/>. */
#ifndef _M6811_SIM_INTERRUPTS_H
#define _M6811_SIM_INTERRUPTS_H
/* Definition of 68HC11 interrupts. These enum are used as an index
in the interrupt table. */
enum M6811_INT
{
M6811_INT_RESERVED1 = 0,
M6811_INT_RESERVED2,
M6811_INT_RESERVED3,
M6811_INT_RESERVED4,
M6811_INT_RESERVED5,
M6811_INT_RESERVED6,
M6811_INT_RESERVED7,
M6811_INT_RESERVED8,
M6811_INT_RESERVED9,
M6811_INT_RESERVED10,
M6811_INT_RESERVED11,
M6811_INT_SCI,
M6811_INT_SPI,
M6811_INT_AINPUT,
M6811_INT_AOVERFLOW,
M6811_INT_TCTN,
M6811_INT_OUTCMP5,
M6811_INT_OUTCMP4,
M6811_INT_OUTCMP3,
M6811_INT_OUTCMP2,
M6811_INT_OUTCMP1,
M6811_INT_INCMP3,
M6811_INT_INCMP2,
M6811_INT_INCMP1,
M6811_INT_RT,
M6811_INT_IRQ,
M6811_INT_XIRQ,
M6811_INT_SWI,
M6811_INT_ILLEGAL,
M6811_INT_COPRESET,
M6811_INT_COPFAIL,
M6811_INT_RESET,
M6811_INT_NUMBER
};
/* Structure to describe how to recognize an interrupt in the
68hc11 IO regs. */
struct interrupt_def
{
enum M6811_INT int_number;
unsigned char int_paddr;
unsigned char int_mask;
unsigned char enable_paddr;
unsigned char enabled_mask;
};
#define MAX_INT_HISTORY 64
/* Structure used to keep track of interrupt history.
This is used to understand in which order interrupts were
raised and when. */
struct interrupt_history
{
enum M6811_INT type;
/* CPU cycle when interrupt handler is called. */
int64_t taken_cycle;
/* CPU cycle when the interrupt is first raised by the device. */
int64_t raised_cycle;
};
#define SIM_STOP_WHEN_RAISED 1
#define SIM_STOP_WHEN_TAKEN 2
/* Information and control of pending interrupts. */
struct interrupt
{
/* CPU cycle when the interrupt is raised by the device. */
int64_t cpu_cycle;
/* Number of times the interrupt was raised. */
unsigned long raised_count;
/* Controls whether we must stop the simulator. */
int stop_mode;
};
/* Management of 68HC11 interrupts:
- We use a table of 'interrupt_def' to describe the interrupts that must be
raised depending on IO register flags (enable and present flags).
- We keep a mask of pending interrupts. This mask is refreshed by
calling 'interrupts_update_pending'. It must be refreshed each time
an IO register is changed.
- 'interrupts_process' must be called after each insn. It has two purposes:
first it maintains a min/max count of CPU cycles between which interrupts
are masked; second it checks for pending interrupts and raise one if
interrupts are enabled. */
struct interrupts {
sim_cpu *cpu;
/* Mask of current pending interrupts. */
unsigned long pending_mask;
/* Address of vector table. This is set depending on the
68hc11 init mode. */
uint16_t vectors_addr;
/* Priority order of interrupts. This is controlled by setting the HPRIO
IO register. */
enum M6811_INT interrupt_order[M6811_INT_NUMBER];
struct interrupt interrupts[M6811_INT_NUMBER];
/* Simulator statistics to report useful debug information to users. */
/* - Max/Min number of CPU cycles executed with interrupts masked. */
int64_t start_mask_cycle;
int64_t min_mask_cycles;
int64_t max_mask_cycles;
int64_t last_mask_cycles;
/* - Same for XIRQ. */
int64_t xirq_start_mask_cycle;
int64_t xirq_min_mask_cycles;
int64_t xirq_max_mask_cycles;
int64_t xirq_last_mask_cycles;
/* - Total number of interrupts raised. */
unsigned long nb_interrupts_raised;
/* Interrupt history to help understand which interrupts
were raised recently and in which order. */
int history_index;
struct interrupt_history interrupts_history[MAX_INT_HISTORY];
};
extern void interrupts_initialize (SIM_DESC sd, sim_cpu *cpu);
extern void interrupts_reset (struct interrupts* interrupts);
extern void interrupts_update_pending (struct interrupts* interrupts);
extern int interrupts_get_current (struct interrupts* interrupts);
extern int interrupts_process (struct interrupts* interrupts);
extern void interrupts_raise (struct interrupts* interrupts,
enum M6811_INT number);
extern void interrupts_info (SIM_DESC sd,
struct interrupts* interrupts);
#endif
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