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/*
* xen/include/asm-arm/mmio.h
*
* ARM I/O handlers
*
* Copyright (c) 2011 Citrix Systems.
*
* 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.
*/
#ifndef __ASM_ARM_MMIO_H__
#define __ASM_ARM_MMIO_H__
#include <xen/lib.h>
#include <xen/rwlock.h>
#include <asm/hsr.h>
#define MAX_IO_HANDLER 16
enum instr_decode_state
{
INSTR_ERROR, /* Error encountered while decoding instr */
INSTR_VALID, /* ISS is valid, so no need to decode */
/*
* Instruction is decoded successfully. It is a ldr/str post indexing
* instruction.
*/
INSTR_LDR_STR_POSTINDEXING,
INSTR_CACHE, /* Cache Maintenance instr */
};
typedef struct
{
struct hsr_dabt dabt;
struct instr_details {
unsigned long rn:5;
signed int imm9:9;
enum instr_decode_state state;
} dabt_instr;
paddr_t gpa;
} mmio_info_t;
enum io_state
{
IO_ABORT, /* The IO was handled by the helper and led to an abort. */
IO_HANDLED, /* The IO was successfully handled by the helper. */
IO_UNHANDLED, /* The IO was not handled by the helper. */
IO_RETRY, /* Retry the emulation for some reason */
};
typedef int (*mmio_read_t)(struct vcpu *v, mmio_info_t *info,
register_t *r, void *priv);
typedef int (*mmio_write_t)(struct vcpu *v, mmio_info_t *info,
register_t r, void *priv);
struct mmio_handler_ops {
mmio_read_t read;
mmio_write_t write;
};
struct mmio_handler {
paddr_t addr;
paddr_t size;
const struct mmio_handler_ops *ops;
void *priv;
};
struct vmmio {
int num_entries;
int max_num_entries;
rwlock_t lock;
struct mmio_handler *handlers;
};
enum io_state try_handle_mmio(struct cpu_user_regs *regs,
mmio_info_t *info);
void register_mmio_handler(struct domain *d,
const struct mmio_handler_ops *ops,
paddr_t addr, paddr_t size, void *priv);
int domain_io_init(struct domain *d, int max_count);
void domain_io_free(struct domain *d);
void try_decode_instruction(const struct cpu_user_regs *regs,
mmio_info_t *info);
#endif /* __ASM_ARM_MMIO_H__ */
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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