2016-07-04 14:06:36 +02:00
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/*
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* Register Definition API
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*
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* Copyright (c) 2016 Xilinx Inc.
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* Copyright (c) 2013 Peter Crosthwaite <peter.crosthwaite@xilinx.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*/
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#ifndef REGISTER_H
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#define REGISTER_H
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#include "exec/memory.h"
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typedef struct RegisterInfo RegisterInfo;
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typedef struct RegisterAccessInfo RegisterAccessInfo;
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2016-07-04 14:06:36 +02:00
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typedef struct RegisterInfoArray RegisterInfoArray;
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2016-07-04 14:06:36 +02:00
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/**
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* Access description for a register that is part of guest accessible device
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* state.
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*
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* @name: String name of the register
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* @ro: whether or not the bit is read-only
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* @w1c: bits with the common write 1 to clear semantic.
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* @reset: reset value.
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* @cor: Bits that are clear on read
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* @rsvd: Bits that are reserved and should not be changed
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*
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* @pre_write: Pre write callback. Passed the value that's to be written,
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* immediately before the actual write. The returned value is what is written,
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* giving the handler a chance to modify the written value.
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* @post_write: Post write callback. Passed the written value. Most write side
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* effects should be implemented here.
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*
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* @post_read: Post read callback. Passes the value that is about to be returned
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* for a read. The return value from this function is what is ultimately read,
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* allowing this function to modify the value before return to the client.
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*/
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struct RegisterAccessInfo {
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const char *name;
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uint64_t ro;
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uint64_t w1c;
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uint64_t reset;
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uint64_t cor;
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uint64_t rsvd;
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uint64_t unimp;
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uint64_t (*pre_write)(RegisterInfo *reg, uint64_t val);
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void (*post_write)(RegisterInfo *reg, uint64_t val);
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uint64_t (*post_read)(RegisterInfo *reg, uint64_t val);
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hwaddr addr;
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2016-07-04 14:06:36 +02:00
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};
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/**
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* A register that is part of guest accessible state
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* @data: pointer to the register data. Will be cast
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* to the relevant uint type depending on data_size.
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* @data_size: Size of the register in bytes. Must be
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* 1, 2, 4 or 8
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*
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* @access: Access description of this register
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*
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* @debug: Whether or not verbose debug is enabled
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* @prefix: String prefix for log and debug messages
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*
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* @opaque: Opaque data for the register
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*/
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struct RegisterInfo {
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/* <public> */
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void *data;
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int data_size;
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const RegisterAccessInfo *access;
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void *opaque;
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};
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2016-07-04 14:06:36 +02:00
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/**
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* This structure is used to group all of the individual registers which are
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* modeled using the RegisterInfo structure.
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*
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* @r is an aray containing of all the relevent RegisterInfo structures.
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*
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* @num_elements is the number of elements in the array r
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*
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* @mem: optional Memory region for the register
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*/
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struct RegisterInfoArray {
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int num_elements;
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RegisterInfo **r;
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bool debug;
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const char *prefix;
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};
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2016-07-04 14:06:36 +02:00
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/**
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* write a value to a register, subject to its restrictions
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* @reg: register to write to
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* @val: value to write
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* @we: write enable mask
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* @prefix: The device prefix that should be printed before the register name
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* @debug: Should the write operation debug information be printed?
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*/
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void register_write(RegisterInfo *reg, uint64_t val, uint64_t we,
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const char *prefix, bool debug);
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/**
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* read a value from a register, subject to its restrictions
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* @reg: register to read from
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* @re: read enable mask
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* @prefix: The device prefix that should be printed before the register name
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* @debug: Should the read operation debug information be printed?
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* returns: value read
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*/
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uint64_t register_read(RegisterInfo *reg, uint64_t re, const char* prefix,
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bool debug);
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/**
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* reset a register
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* @reg: register to reset
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*/
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void register_reset(RegisterInfo *reg);
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2016-07-04 14:06:36 +02:00
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/**
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* Memory API MMIO write handler that will write to a Register API register.
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* @opaque: RegisterInfo to write to
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* @addr: Address to write
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* @value: Value to write
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* @size: Number of bytes to write
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*/
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void register_write_memory(void *opaque, hwaddr addr, uint64_t value,
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unsigned size);
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/**
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* Memory API MMIO read handler that will read from a Register API register.
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* @opaque: RegisterInfo to read from
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* @addr: Address to read
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* @size: Number of bytes to read
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* returns: Value read from register
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*/
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uint64_t register_read_memory(void *opaque, hwaddr addr, unsigned size);
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2016-07-04 14:06:36 +02:00
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#endif
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