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/*
* Register Definition API
*
* Copyright (c) 2016 Xilinx Inc.
* Copyright (c) 2013 Peter Crosthwaite <peter.crosthwaite@xilinx.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*/
#ifndef REGISTER_H
#define REGISTER_H
#include "exec/memory.h"
typedef struct RegisterInfo RegisterInfo;
typedef struct RegisterAccessInfo RegisterAccessInfo;
typedef struct RegisterInfoArray RegisterInfoArray;
/**
* Access description for a register that is part of guest accessible device
* state.
*
* @name: String name of the register
* @ro: whether or not the bit is read-only
* @w1c: bits with the common write 1 to clear semantic.
* @reset: reset value.
* @cor: Bits that are clear on read
* @rsvd: Bits that are reserved and should not be changed
*
* @pre_write: Pre write callback. Passed the value that's to be written,
* immediately before the actual write. The returned value is what is written,
* giving the handler a chance to modify the written value.
* @post_write: Post write callback. Passed the written value. Most write side
* effects should be implemented here.
*
* @post_read: Post read callback. Passes the value that is about to be returned
* for a read. The return value from this function is what is ultimately read,
* allowing this function to modify the value before return to the client.
*/
struct RegisterAccessInfo {
const char *name;
uint64_t ro;
uint64_t w1c;
uint64_t reset;
uint64_t cor;
uint64_t rsvd;
uint64_t unimp;
uint64_t (*pre_write)(RegisterInfo *reg, uint64_t val);
void (*post_write)(RegisterInfo *reg, uint64_t val);
uint64_t (*post_read)(RegisterInfo *reg, uint64_t val);
hwaddr addr;
};
/**
* A register that is part of guest accessible state
* @data: pointer to the register data. Will be cast
* to the relevant uint type depending on data_size.
* @data_size: Size of the register in bytes. Must be
* 1, 2, 4 or 8
*
* @access: Access description of this register
*
* @debug: Whether or not verbose debug is enabled
* @prefix: String prefix for log and debug messages
*
* @opaque: Opaque data for the register
*/
struct RegisterInfo {
/* <public> */
void *data;
int data_size;
const RegisterAccessInfo *access;
void *opaque;
};
/**
* This structure is used to group all of the individual registers which are
* modeled using the RegisterInfo structure.
*
* @r is an aray containing of all the relevent RegisterInfo structures.
*
* @num_elements is the number of elements in the array r
*
* @mem: optional Memory region for the register
*/
struct RegisterInfoArray {
int num_elements;
RegisterInfo **r;
bool debug;
const char *prefix;
};
/**
* write a value to a register, subject to its restrictions
* @reg: register to write to
* @val: value to write
* @we: write enable mask
* @prefix: The device prefix that should be printed before the register name
* @debug: Should the write operation debug information be printed?
*/
void register_write(RegisterInfo *reg, uint64_t val, uint64_t we,
const char *prefix, bool debug);
/**
* read a value from a register, subject to its restrictions
* @reg: register to read from
* @re: read enable mask
* @prefix: The device prefix that should be printed before the register name
* @debug: Should the read operation debug information be printed?
* returns: value read
*/
uint64_t register_read(RegisterInfo *reg, uint64_t re, const char* prefix,
bool debug);
/**
* reset a register
* @reg: register to reset
*/
void register_reset(RegisterInfo *reg);
/**
* Memory API MMIO write handler that will write to a Register API register.
* @opaque: RegisterInfo to write to
* @addr: Address to write
* @value: Value to write
* @size: Number of bytes to write
*/
void register_write_memory(void *opaque, hwaddr addr, uint64_t value,
unsigned size);
/**
* Memory API MMIO read handler that will read from a Register API register.
* @opaque: RegisterInfo to read from
* @addr: Address to read
* @size: Number of bytes to read
* returns: Value read from register
*/
uint64_t register_read_memory(void *opaque, hwaddr addr, unsigned size);
#endif
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