freebsd-skq/stand/common/bootstrap.h

/*-
 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD$
 */

#ifndef _BOOTSTRAP_H_
#define	_BOOTSTRAP_H_

#include <sys/types.h>
#include <sys/queue.h>
#include <sys/linker_set.h>

#include "readin.h"

/* Commands and return values; nonzero return sets command_errmsg != NULL */
typedef int	(bootblk_cmd_t)(int argc, char *argv[]);
#define	COMMAND_ERRBUFSZ	(256)
extern const char *command_errmsg;
extern char	command_errbuf[COMMAND_ERRBUFSZ];
#define	CMD_OK		0
#define	CMD_WARN	1
#define	CMD_ERROR	2
#define	CMD_CRIT	3
#define	CMD_FATAL	4

/* interp.c */
void	interact(void);
void	interp_emit_prompt(void);
int	interp_builtin_cmd(int argc, char *argv[]);

/* Called by interp.c for interp_*.c embedded interpreters */
int	interp_include(const char *);	/* Execute commands from filename */
void	interp_init(void);		/* Initialize interpreater */
int	interp_run(const char *);	/* Run a single command */

/* interp_backslash.c */
char	*backslash(const char *str);

/* interp_parse.c */
int	parse(int *argc, char ***argv, const char *str);

/* boot.c */
void	autoboot_maybe(void);
int	getrootmount(char *rootdev);

/* misc.c */
char	*unargv(int argc, char *argv[]);
size_t	strlenout(vm_offset_t str);
char	*strdupout(vm_offset_t str);
void	kern_bzero(vm_offset_t dest, size_t len);
int	kern_pread(readin_handle_t fd, vm_offset_t dest, size_t len, off_t off);
void	*alloc_pread(readin_handle_t fd, off_t off, size_t len);

/* bcache.c */
void	bcache_init(size_t nblks, size_t bsize);
void	bcache_add_dev(int);
void	*bcache_allocate(void);
void	bcache_free(void *);
int	bcache_strategy(void *devdata, int rw, daddr_t blk, size_t size,
			char *buf, size_t *rsize);

/*
 * Disk block cache
 */
struct bcache_devdata
{
	int	(*dv_strategy)(void *, int, daddr_t, size_t, char *, size_t *);
	void	*dv_devdata;
	void	*dv_cache;
};

/*
 * Modular console support.
 */
struct console
{
	const char	*c_name;
	const char	*c_desc;
	int		c_flags;
#define	C_PRESENTIN	(1<<0)	    /* console can provide input */
#define	C_PRESENTOUT	(1<<1)	    /* console can provide output */
#define	C_ACTIVEIN	(1<<2)	    /* user wants input from console */
#define	C_ACTIVEOUT	(1<<3)	    /* user wants output to console */
#define	C_WIDEOUT	(1<<4)	    /* c_out routine groks wide chars */

	/* set c_flags to match hardware */
	void	(* c_probe)(struct console *cp);
	/* reinit XXX may need more args */
	int		(* c_init)(int arg);
	/* emit c */
	void		(* c_out)(int c);
	/* wait for and return input */
	int		(* c_in)(void);
	/* return nonzero if input waiting */
	int		(* c_ready)(void);
};
extern struct console *consoles[];
void cons_probe(void);

/*
 * Plug-and-play enumerator/configurator interface.
 */
struct pnphandler
{
	const char *pp_name;		/* handler/bus name */
	void (*pp_enumerate)(void); /* enumerate PnP devices, add to chain */
};

struct pnpident
{
	/* ASCII identifier, actual format varies with bus/handler */
	char			*id_ident;
	STAILQ_ENTRY(pnpident)	id_link;
};

struct pnpinfo
{
	char	*pi_desc;	/* ASCII description, optional */
	int	pi_revision;	/* optional revision (or -1) if not supported */
	char	*pi_module;	/* module/args nominated to handle device */
	int	pi_argc;	/* module arguments */
	char	**pi_argv;
	struct pnphandler *pi_handler;	/* handler which detected this device */
	STAILQ_HEAD(, pnpident)	pi_ident;	/* list of identifiers */
	STAILQ_ENTRY(pnpinfo)	pi_link;
};

STAILQ_HEAD(pnpinfo_stql, pnpinfo);

extern struct pnphandler *pnphandlers[];	/* provided by MD code */

void			pnp_addident(struct pnpinfo *pi, char *ident);
struct pnpinfo		*pnp_allocinfo(void);
void			pnp_freeinfo(struct pnpinfo *pi);
void			pnp_addinfo(struct pnpinfo *pi);
char			*pnp_eisaformat(uint8_t *data);

/*
 *  < 0	- No ISA in system
 * == 0	- Maybe ISA, search for read data port
 *  > 0	- ISA in system, value is read data port address
 */
extern int isapnp_readport;

/*
 * Version information
 */
extern char bootprog_info[];

/*
 * Interpreter information
 */
extern const char bootprog_interp[];
#define	INTERP_DEFINE(interpstr) \
const char bootprog_interp[] = "$Interpreter:" interpstr


/*
 * Preloaded file metadata header.
 *
 * Metadata are allocated on our heap, and copied into kernel space
 * before executing the kernel.
 */
struct file_metadata
{
	size_t		md_size;
	uint16_t	md_type;
	struct file_metadata *md_next;
	char		md_data[1];	/* data are immediately appended */
};

struct preloaded_file;
struct mod_depend;

struct kernel_module
{
	char	*m_name;	/* module name */
	int	m_version;	/* module version */
	/* char			*m_args; */	/* arguments for the module */
	struct preloaded_file	*m_fp;
	struct kernel_module	*m_next;
};

/*
 * Preloaded file information. Depending on type, file can contain
 * additional units called 'modules'.
 *
 * At least one file (the kernel) must be loaded in order to boot.
 * The kernel is always loaded first.
 *
 * String fields (m_name, m_type) should be dynamically allocated.
 */
struct preloaded_file
{
	char *f_name;	/* file name */
	char *f_type; /* verbose file type, eg 'ELF kernel', 'pnptable', etc. */
	char *f_args;	/* arguments for the file */
	/* metadata that will be placed in the module directory */
	struct file_metadata *f_metadata;
	int f_loader;	/* index of the loader that read the file */
	vm_offset_t f_addr;	/* load address */
	size_t f_size;		/* file size */
	struct kernel_module	*f_modules;	/* list of modules if any */
	struct preloaded_file	*f_next;	/* next file */
};

struct file_format
{
	/*
	 * Load function must return EFTYPE if it can't handle
	 * the module supplied
	 */
	int (*l_load)(char *, uint64_t, struct preloaded_file **);
	/*
	 * Only a loader that will load a kernel (first module)
	 * should have an exec handler
	 */
	int (*l_exec)(struct preloaded_file *);
};

extern struct file_format *file_formats[];	/* supplied by consumer */
extern struct preloaded_file *preloaded_files;

int mod_load(char *name, struct mod_depend *verinfo, int argc, char *argv[]);
int mod_loadkld(const char *name, int argc, char *argv[]);
void unload(void);

struct preloaded_file *file_alloc(void);
struct preloaded_file *file_findfile(const char *name, const char *type);
struct file_metadata *file_findmetadata(struct preloaded_file *fp, int type);
struct preloaded_file *file_loadraw(const char *name, char *type, int insert);
void file_discard(struct preloaded_file *fp);
void file_addmetadata(struct preloaded_file *, int, size_t, void *);
int file_addmodule(struct preloaded_file *, char *, int,
    struct kernel_module **);
void file_removemetadata(struct preloaded_file *fp);

/* MI module loaders */
#ifdef __elfN
/* Relocation types. */
#define	ELF_RELOC_REL	1
#define	ELF_RELOC_RELA	2

/* Relocation offset for some architectures */
extern uint64_t __elfN(relocation_offset);

struct elf_file;
typedef Elf_Addr (symaddr_fn)(struct elf_file *ef, Elf_Size symidx);

int	__elfN(loadfile)(char *, uint64_t, struct preloaded_file **);
int	__elfN(obj_loadfile)(char *, uint64_t, struct preloaded_file **);
int	__elfN(reloc)(struct elf_file *ef, symaddr_fn *symaddr,
	    const void *reldata, int reltype, Elf_Addr relbase,
	    Elf_Addr dataaddr, void *data, size_t len);
int __elfN(loadfile_raw)(char *, uint64_t, struct preloaded_file **, int);
int __elfN(load_modmetadata)(struct preloaded_file *, uint64_t);
#endif

/*
 * Support for commands
 */
struct bootblk_command
{
    const char		*c_name;
    const char		*c_desc;
    bootblk_cmd_t	*c_fn;
};

#define	COMMAND_SET(tag, key, desc, func)				\
    static bootblk_cmd_t func;						\
    static struct bootblk_command _cmd_ ## tag = { key, desc, func };	\
    DATA_SET(Xcommand_set, _cmd_ ## tag)

SET_DECLARE(Xcommand_set, struct bootblk_command);

/*
 * The intention of the architecture switch is to provide a convenient
 * encapsulation of the interface between the bootstrap MI and MD code.
 * MD code may selectively populate the switch at runtime based on the
 * actual configuration of the target system.
 */
struct arch_switch
{
	/* Automatically load modules as required by detected hardware */
	int (*arch_autoload)(void);
	/* Locate the device for (name), return pointer to tail in (*path) */
	int (*arch_getdev)(void **dev, const char *name, const char **path);
	/*
	 * Copy from local address space to module address space,
	 * similar to bcopy()
	 */
	ssize_t	(*arch_copyin)(const void *, vm_offset_t, const size_t);
	/*
	 * Copy to local address space from module address space,
	 * similar to bcopy()
	 */
	ssize_t	(*arch_copyout)(const vm_offset_t, void *, const size_t);
	/* Read from file to module address space, same semantics as read() */
	ssize_t	(*arch_readin)(readin_handle_t, vm_offset_t, const size_t);
	/* Perform ISA byte port I/O (only for systems with ISA) */
	int (*arch_isainb)(int port);
	void (*arch_isaoutb)(int port, int value);

	/*
	 * Interface to adjust the load address according to the "object"
	 * being loaded.
	 */
	uint64_t (*arch_loadaddr)(u_int type, void *data, uint64_t addr);
#define	LOAD_ELF	1	/* data points to the ELF header. */
#define	LOAD_RAW	2	/* data points to the file name. */

	/*
	 * Interface to inform MD code about a loaded (ELF) segment. This
	 * can be used to flush caches and/or set up translations.
	 */
#ifdef __elfN
	void (*arch_loadseg)(Elf_Ehdr *eh, Elf_Phdr *ph, uint64_t delta);
#else
	void (*arch_loadseg)(void *eh, void *ph, uint64_t delta);
#endif

	/* Probe ZFS pool(s), if needed. */
	void (*arch_zfs_probe)(void);

	/* Return the hypervisor name/type or NULL if not virtualized. */
	const char *(*arch_hypervisor)(void);

	/* For kexec-type loaders, get ksegment structure */
	void (*arch_kexec_kseg_get)(int *nseg, void **kseg);
};
extern struct arch_switch archsw;

/* This must be provided by the MD code, but should it be in the archsw? */
void	delay(int delay);

void	dev_cleanup(void);

/*
 * nvstore API.
 */
typedef int (nvstore_getter_cb_t)(void *, const char *, void **);
typedef int (nvstore_setter_cb_t)(void *, int, const char *,
    const void *, size_t);
typedef int (nvstore_setter_str_cb_t)(void *, const char *, const char *,
    const char *);
typedef int (nvstore_unset_cb_t)(void *, const char *);
typedef int (nvstore_print_cb_t)(void *, void *);
typedef int (nvstore_iterate_cb_t)(void *, int (*)(void *, void *));

typedef struct nvs_callbacks {
	nvstore_getter_cb_t	*nvs_getter;
	nvstore_setter_cb_t	*nvs_setter;
	nvstore_setter_str_cb_t *nvs_setter_str;
	nvstore_unset_cb_t	*nvs_unset;
	nvstore_print_cb_t	*nvs_print;
	nvstore_iterate_cb_t	*nvs_iterate;
} nvs_callbacks_t;

int nvstore_init(const char *, nvs_callbacks_t *, void *);
int nvstore_fini(const char *);
void *nvstore_get_store(const char *);
int nvstore_print(void *);
int nvstore_get_var(void *, const char *, void **);
int nvstore_set_var(void *, int, const char *, void *, size_t);
int nvstore_set_var_from_string(void *, const char *, const char *,
    const char *);
int nvstore_unset_var(void *, const char *);

#ifndef CTASSERT
#define	CTASSERT(x)	_Static_assert(x, "compile-time assertion failed")
#endif

#endif /* !_BOOTSTRAP_H_ */