loader: update elf module code from FreeBSD

[dragonfly.git] / sys / boot / 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: src/sys/boot/common/bootstrap.h,v 1.38 2003/05/01 03:56:29 peter Exp $
 * $DragonFly: src/sys/boot/common/bootstrap.h,v 1.4 2008/09/02 17:21:12 dillon Exp $
 */

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

/*
 * Generic device specifier; architecture-dependant 
 * versions may be larger, but should be allowed to
 * overlap.
 */
struct devdesc 
{
    struct devsw        *d_dev;
    int                 d_type;
#define DEVT_NONE       0
#define DEVT_DISK       1
#define DEVT_NET        2
#define DEVT_CD         3
};

/* Commands and return values; nonzero return sets command_errmsg != NULL */
typedef int     (bootblk_cmd_t)(int argc, char *argv[]);
extern char     *command_errmsg;        
extern char     command_errbuf[];       /* XXX blah, length */
#define CMD_OK          0
#define CMD_ERROR       1

/* interp.c */
void    interact(void);
int     include(const char *filename);

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

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

/* interp_forth.c */
void    bf_init(void);
int     bf_run(char *line);

/* boot.c */
int     autoboot(int timeout, char *prompt);
void    autoboot_maybe(void);
int     getrootmount(char *rootdev);
int     rel_open(const char *path, int flags);
int     chdir(const char *path);

/* misc.c */
char    *unargv(int argc, char *argv[]);
void    hexdump(caddr_t region, size_t len);
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(int fd, vm_offset_t dest, size_t len, off_t off);
void    *alloc_pread(int fd, off_t off, size_t len);

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

/*
 * Disk block cache
 */
struct bcache_devdata
{
    int         (*dv_strategy)(void *devdata, int rw, daddr_t blk, size_t size, char *buf, size_t *rsize);
    void        *dv_devdata;
};

/*
 * Modular console support.
 */
struct console 
{
    const char  *c_name;
    const char  *c_desc;
    int         c_flags;
#define C_PRESENTIN     (1<<0)
#define C_PRESENTOUT    (1<<1)
#define C_ACTIVEIN      (1<<2)
#define C_ACTIVEOUT     (1<<3)
    void        (* c_probe)(struct console *cp);        /* set c_flags to match hardware */
    int         (* c_init)(int arg);                    /* reinit XXX may need more args */
    void        (* c_out)(int c);                       /* emit c */
    int         (* c_in)(void);                         /* wait for and return input */
    int         (* c_ready)(void);                      /* return nonzer if input waiting */
};
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
{
    char                        *id_ident;      /* ASCII identifier, actual format varies with bus/handler */
    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 pnpinfo_stql pnp_devices;

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(u_int8_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;

/*
 * 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;
    u_int16_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 */
    struct file_metadata        *f_metadata;    /* metadata that will be placed in the module directory */
    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 *filename, u_int64_t dest, struct preloaded_file **result);
    /* Only a loader that will load a kernel (first module) should have an exec handler */
    int         (* l_exec)(struct preloaded_file *mp);
};

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[]);

struct preloaded_file *file_alloc(void);
struct preloaded_file *file_findfile(char *name, char *type);
struct file_metadata *file_findmetadata(struct preloaded_file *fp, int type);
void file_discard(struct preloaded_file *fp);
void file_addmetadata(struct preloaded_file *fp, int type, size_t size, void *p);
int  file_addmodule(struct preloaded_file *fp, char *modname, int version,
        struct kernel_module **newmp);


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

/* Relocation offset for some architectures */
extern u_int64_t __elfN(relocation_offset);

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

int     __elfN(loadfile)(char *filename, u_int64_t dest, struct preloaded_file **result);
int     __elfN(obj_loadfile)(char *filename, u_int64_t dest,
            struct preloaded_file **result);
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);
#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 *src, vm_offset_t dest,
                               const size_t len);
    /* Copy to local address space from module address space, similar to bcopy() */
    ssize_t     (*arch_copyout)(const vm_offset_t src, void *dest,
                                const size_t len);
    /* Read from file to module address space, same semantics as read() */
    ssize_t     (*arch_readin)(const int fd, vm_offset_t dest,
                               const size_t len);
    /* Perform ISA byte port I/O (only for systems with ISA) */
    int         (*arch_isainb)(int port);
    void        (*arch_isaoutb)(int port, int value);
};
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);

time_t  time(time_t *tloc);