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#ifndef __SYS_VFS_H
#define __SYS_VFS_H
#include <stdint.h>
// NOTE!. This file is included by linker.C and can't include non standard header files
#ifndef LINKER_C
// other includes not visable to the linker
#include <sys/task.h>
#endif
// make TODO VFS_MODULE_MAX equal to the actual number of modules in the base image (+ 2?)
#define VFS_MODULE_MAX 64
// Extended use 4 4k pages
// Extended Module Virtual address at 1GB
#define VFS_EXTENDED_MODULE_VADDR (1 * 1024 * 1024 * 1024)
#define VFS_EXTENDED_MODULE_TABLE_ADDRESS (VFS_EXTENDED_MODULE_VADDR)
#define VFS_EXTENDED_MODULE_TABLE_OFFSET 0
#define VFS_EXTENDED_MODULE_MAX 128
#define VFS_MODULE_NAME_MAX 64
#define VFS_SYMBOL_INIT _init
#define VFS_SYMBOL_START _start
#define VFS_SYMBOL_FINI _fini
#define VFS_SYMBOL_TEXT .text
#define VFS_SYMBOL_DATA .data
#define VFS_STRINGIFY(X) #X
#define VFS_TOSTRING(X) VFS_STRINGIFY(X)
#define VFS_MODULE_DEFINE_START(f) \
extern "C" void VFS_SYMBOL_START(void* args) \
{ \
f(args); \
}
#ifdef __cplusplus
extern "C"
{
#endif
extern const char* VFS_ROOT;
extern const char* VFS_ROOT_BIN;
extern const char* VFS_ROOT_DATA;
extern const char* VFS_ROOT_MSG;
extern const char* VFS_MSG;
enum VfsMessages
{
VFS_MSG_REGISTER_MSGQ, //!< Message to VFS_ROOT to register a message queue
VFS_MSG_RESOLVE_MSGQ, //!< Message to VFS_ROOT to find a message queue
VFS_MSG_EXEC, //!< Message to VFS_ROOT execute a module
VFS_MSG_LOAD, //!< Message to VFS_MSG to load a module
VFS_MSG_UNLOAD, //!< Message to VFS_MSG to unload a module
};
struct VfsSystemModule
{
const char module[VFS_MODULE_NAME_MAX]; //!< Module name
void (*init)(void*); //!< ptr to init()
void (*start)(void*); //!< ptr to start()
void (*fini)(void*); //!< ptr to fini()
uint64_t * text; //!< ptr to text (code) section
uint64_t * data; //!< ptr to data section
uint64_t page_size; //!< no. of memory pages used
};
extern VfsSystemModule VFS_MODULES[VFS_MODULE_MAX];
extern uint64_t VFS_LAST_ADDRESS;
#ifdef __cplusplus
}
#endif
#ifndef LINKER_C
/**
* Find the VfsSystemModule data for the given module name
* @param[in] i_table VFS module table
* @param[in] i_name name of module to find
* @return VfsSystemModule ptr to data | NULL if not found
*/
VfsSystemModule * vfs_find_module(VfsSystemModule * i_table, const char * i_name);
/**
* Call the module start routine
* @param[in] i_module VfsSystemModule data for the module
* @param[in] i_param parameter to pass to task_create() for this module
* @return tid_t of started task | -1 if i_module is NULL | -2 if there is no start()
*/
tid_t vfs_exec(VfsSystemModule * i_module, void* i_param);
#endif
#endif
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