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prom.c

/*
 *  prom.c - Routines for talking to the Open Firmware PROM
 *
 *  Copyright (C) 2001, 2002 Ethan Benson
 *
 *  Copyright (C) 1999 Benjamin Herrenschmidt
 *
 *  Copyright (C) 1999 Marius Vollmer
 *
 *  Copyright (C) 1996 Paul Mackerras.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#include "prom.h"
#include "stdarg.h"
#include "stddef.h"
#include "stdlib.h"
#include "types.h"
#include "ctype.h"
#include "asm/processor.h"
#include "errors.h"
#include "debug.h"

#define READ_BLOCKS_USE_READ  1

prom_entry prom;

ihandle prom_stdin, prom_stdout;

//extern int vsprintf(char *buf, const char *fmt, va_list args);

static ihandle prom_mem, prom_mmu;
static ihandle prom_chosen, prom_options;

struct prom_args {
     const char *service;
     int nargs;
     int nret;
     void *args[10];
};

void *
call_prom (const char *service, int nargs, int nret, ...)
{
     va_list list;
     int i;
     struct prom_args prom_args;
  
     prom_args.service = service;
     prom_args.nargs = nargs;
     prom_args.nret = nret;
     va_start (list, nret);
     for (i = 0; i < nargs; ++i)
        prom_args.args[i] = va_arg(list, void *);
     va_end(list);
     for (i = 0; i < nret; ++i)
        prom_args.args[i + nargs] = 0;
     prom (&prom_args);
     if (nret > 0)
        return prom_args.args[nargs];
     else
        return 0;
}

void *
call_prom_return (const char *service, int nargs, int nret, ...)
{
     va_list list;
     int i;
     void* result;
     struct prom_args prom_args;
  
     prom_args.service = service;
     prom_args.nargs = nargs;
     prom_args.nret = nret;
     va_start (list, nret);
     for (i = 0; i < nargs; ++i)
        prom_args.args[i] = va_arg(list, void *);
     for (i = 0; i < nret; ++i)
        prom_args.args[i + nargs] = 0;
     if (prom (&prom_args) != 0)
        return PROM_INVALID_HANDLE;
     if (nret > 0) {
        result = prom_args.args[nargs];
        for (i=1; i<nret; i++) {
             void** rp = va_arg(list, void**);
             *rp = prom_args.args[i+nargs];
        }
     } else
        result = 0;
     va_end(list);
     return result;
}

static void *
call_method_1 (char *method, prom_handle h, int nargs, ...)
{
     va_list list;
     int i;
     struct prom_args prom_args;
  
     prom_args.service = "call-method";
     prom_args.nargs = nargs+2;
     prom_args.nret = 2;
     prom_args.args[0] = method;
     prom_args.args[1] = h;
     va_start (list, nargs);
     for (i = 0; i < nargs; ++i)
        prom_args.args[2+i] = va_arg(list, void *);
     va_end(list);
     prom_args.args[2+nargs] = 0;
     prom_args.args[2+nargs+1] = 0;
  
     prom (&prom_args);

     if (prom_args.args[2+nargs] != 0)
     {
        prom_printf ("method '%s' failed %p\n", method, prom_args.args[2+nargs]);
        return 0;
     }
     return prom_args.args[2+nargs+1];
}


prom_handle
prom_finddevice (char *name)
{
     return call_prom ("finddevice", 1, 1, name);
}

prom_handle
prom_findpackage(char *path)
{
     return call_prom ("find-package", 1, 1, path);
}

int
prom_getprop (prom_handle pack, char *name, void *mem, int len)
{
     return (int)call_prom ("getprop", 4, 1, pack, name, mem, len);
}

int
prom_get_chosen (char *name, void *mem, int len)
{
     return prom_getprop (prom_chosen, name, mem, len);
}

int
prom_get_options (char *name, void *mem, int len)
{
     if (prom_options == (void *)-1)
        return -1;
     return prom_getprop (prom_options, name, mem, len);
}

int
prom_get_devtype (char *device)
{
     phandle    dev;
     int        result;
     char       tmp[64];

     /* Find OF device phandle */
     dev = prom_finddevice(device);
     if (dev == PROM_INVALID_HANDLE) {
        return FILE_ERR_BADDEV;
     }

     /* Check the kind of device */
     result = prom_getprop(dev, "device_type", tmp, 63);
     if (result == -1) {
        prom_printf("can't get <device_type> for device: %s\n", device);
        return FILE_ERR_BADDEV;
     }
     tmp[result] = 0;
     if (!strcmp(tmp, "block"))
        return FILE_DEVICE_BLOCK;
     else if (!strcmp(tmp, "network"))
        return FILE_DEVICE_NET;
     else {
        prom_printf("Unkown device type <%s>\n", tmp);
        return FILE_ERR_BADDEV;
     }
}

void
prom_init (prom_entry pp)
{
     prom = pp;

     prom_chosen = prom_finddevice ("/chosen");
     if (prom_chosen == (void *)-1)
        prom_exit ();
     prom_options = prom_finddevice ("/options");
     if (prom_get_chosen ("stdout", &prom_stdout, sizeof(prom_stdout)) <= 0)
        prom_exit();
     if (prom_get_chosen ("stdin", &prom_stdin, sizeof(prom_stdin)) <= 0)
        prom_abort ("\nCan't open stdin");
     if (prom_get_chosen ("memory", &prom_mem, sizeof(prom_mem)) <= 0)
        prom_abort ("\nCan't get mem handle");
     if (prom_get_chosen ("mmu", &prom_mmu, sizeof(prom_mmu)) <= 0)
        prom_abort ("\nCan't get mmu handle");

  // move cursor to fresh line
     prom_printf ("\n");

     /* Add a few OF methods (thanks Darwin) */
#if DEBUG
     prom_printf ("Adding OF methods...\n");
#endif  

     prom_interpret (
        /* All values in this forth code are in hex */
        "hex "    
        /* Those are a few utilities ripped from Apple */
        ": D2NIP decode-int nip nip ;\r"  // A useful function to save space
        ": GPP$ get-package-property 0= ;\r"    // Another useful function to save space
        ": ^on0 0= if -1 throw then ;\r"  // Bail if result zero
        ": $CM $call-method ;\r"
        );

     /* Some forth words used by the release method */
     prom_interpret (
        " \" /chosen\" find-package if "
             "dup \" memory\" rot GPP$ if "
                   "D2NIP swap "                       // ( MEMORY-ihandle "/chosen"-phandle )
                   "\" mmu\" rot GPP$ if "
                         "D2NIP "                      // ( MEMORY-ihandle MMU-ihandle )
                   "else "
                         "0 "                          // ( MEMORY-ihandle 0 )
                   "then "
             "else "
                   "0 0 "                                    // ( 0 0 )
             "then "
        "else "
             "0 0 "                                          // ( 0 0 )
        "then\r"
        "value mmu# "
        "value mem# "
        );

     prom_interpret (
        ": ^mem mem# $CM ; "
        ": ^mmu mmu# $CM ; "
        );

     DEBUG_F("OF interface initialized.\n");
}

prom_handle
prom_open (char *spec)
{
     return call_prom ("open", 1, 1, spec, strlen(spec));
}

void
prom_close (prom_handle file)
{
     call_prom ("close", 1, 0, file);
}

int
prom_read (prom_handle file, void *buf, int n)
{
     int result = 0;
     int retries = 10;
  
     if (n == 0)
        return 0;
     while(--retries) {
        result = (int)call_prom ("read", 3, 1, file, buf, n);
        if (result != 0)
             break;
        call_prom("interpret", 1, 1, " 10 ms");
     }
  
     return result;
}

int
prom_write (prom_handle file, void *buf, int n)
{
     return (int)call_prom ("write", 3, 1, file, buf, n);
}

int
prom_seek (prom_handle file, int pos)
{
     int status = (int)call_prom ("seek", 3, 1, file, 0, pos);
     return status == 0 || status == 1;
}

int
prom_lseek (prom_handle file, unsigned long long pos)
{
     int status = (int)call_prom ("seek", 3, 1, file,
                          (unsigned int)(pos >> 32), (unsigned int)(pos & 0xffffffffUL));
     return status == 0 || status == 1;
}

int
prom_loadmethod (prom_handle device, void* addr)
{
     return (int)call_method_1 ("load", device, 1, addr);
}

int
prom_getblksize (prom_handle file)
{
     return (int)call_method_1 ("block-size", file, 0);
}

int
prom_readblocks (prom_handle dev, int blockNum, int blockCount, void *buffer)
{
#if READ_BLOCKS_USE_READ
     int status;
     unsigned int blksize;
  
     blksize = prom_getblksize(dev);
     if (blksize <= 1)
        blksize = 512;
     status = prom_seek(dev, blockNum * blksize);
     if (status != 1) {
        return 0;
        prom_printf("Can't seek to 0x%x\n", blockNum * blksize);
     }
      
     status = prom_read(dev, buffer, blockCount * blksize);
//  prom_printf("prom_readblocks, bl: %d, cnt: %d, status: %d\n",
//    blockNum, blockCount, status);

     return status == (blockCount * blksize);
#else 
     int result;
     int retries = 10;
  
     if (blockCount == 0)
        return blockCount;
     while(--retries) {
        result = call_method_1 ("read-blocks", dev, 3, buffer, blockNum, blockCount);
        if (result != 0)
             break;
        call_prom("interpret", 1, 1, " 10 ms");
     }
  
     return result;
#endif  
}

int
prom_getchar ()
{
     char c[4];
     int a;

     while ((a = (int)call_prom ("read", 3, 1, prom_stdin, c, 4)) == 0)
        ;
     if (a == -1)
        prom_abort ("EOF on console\n");
     if (a == 3 && c[0] == '\e' && c[1] == '[')
        return 0x100 | c[2];
     return c[0];
}

int
prom_nbgetchar()
{
     char ch;

     return (int) call_prom("read", 3, 1, prom_stdin, &ch, 1) > 0? ch: -1;
}

void
prom_putchar (char c)
{
     if (c == '\n')
        call_prom ("write", 3, 1, prom_stdout, "\r\n", 2);
     else
        call_prom ("write", 3, 1, prom_stdout, &c, 1);
}

void
prom_puts (prom_handle file, char *s)
{
     const char *p, *q;

     for (p = s; *p != 0; p = q) 
     {
        for (q = p; *q != 0 && *q != '\n'; ++q)
             ;
        if (q > p)
             call_prom ("write", 3, 1, file, p, q - p);
        if (*q != 0) 
        {
             ++q;
             call_prom ("write", 3, 1, file, "\r\n", 2);
        }
     }
}
 
void
prom_vfprintf (prom_handle file, char *fmt, va_list ap)
{
     static char printf_buf[2048];
     vsprintf (printf_buf, fmt, ap);
     prom_puts (file, printf_buf);
}

void
prom_vprintf (char *fmt, va_list ap)
{
     static char printf_buf[2048];
     vsprintf (printf_buf, fmt, ap);
     prom_puts (prom_stdout, printf_buf);
}

void
prom_fprintf (prom_handle file, char *fmt, ...)
{
     va_list ap;
     va_start (ap, fmt);
     prom_vfprintf (file, fmt, ap);
     va_end (ap);
}

void
prom_printf (char *fmt, ...)
{
     va_list ap;
     va_start (ap, fmt);
     prom_vfprintf (prom_stdout, fmt, ap);
     va_end (ap);
}

void
prom_perror (int error, char *filename)
{
     if (error == FILE_ERR_EOF)
        prom_printf("%s: Unexpected End Of File\n", filename);
     else if (error == FILE_ERR_NOTFOUND)
        prom_printf("%s: No such file or directory\n", filename);
     else if (error == FILE_CANT_SEEK)
        prom_printf("%s: Seek error\n", filename);
     else if (error == FILE_IOERR)
        prom_printf("%s: Input/output error\n", filename);
     else if (error == FILE_BAD_PATH)
        prom_printf("%s: Path too long\n", filename); 
     else if (error == FILE_ERR_BAD_TYPE)
        prom_printf("%s: Not a regular file\n", filename);
     else if (error == FILE_ERR_NOTDIR)
        prom_printf("%s: Not a directory\n", filename);
     else if (error == FILE_ERR_BAD_FSYS)
        prom_printf("%s: Unknown or corrupt filesystem\n", filename);
     else if (error == FILE_ERR_SYMLINK_LOOP)
        prom_printf("%s: Too many levels of symbolic links\n", filename);
     else if (error == FILE_ERR_LENGTH)
        prom_printf("%s: File too large\n", filename);
     else if (error == FILE_ERR_FSBUSY)
        prom_printf("%s: Filesystem busy\n", filename);
     else if (error == FILE_ERR_BADDEV)
        prom_printf("%s: Unable to open file, Invalid device\n", filename);
     else
        prom_printf("%s: Unknown error\n", filename);
}

void
prom_readline (char *prompt, char *buf, int len)
{
     int i = 0;
     int c;

     if (prompt)
        prom_puts (prom_stdout, prompt);

     while (i < len-1 && (c = prom_getchar ()) != '\r')
     {
        if (c >= 0x100)
             continue;
        if (c == 8)
        {
             if (i > 0)
             {
                prom_puts (prom_stdout, "\b \b");
                i--;
             }
             else
                prom_putchar ('\a');
        }
        else if (isprint (c))
        {
             prom_putchar (c);
             buf[i++] = c;
        }
        else
             prom_putchar ('\a');
     }
     prom_putchar ('\n');
     buf[i] = 0;
}

#ifdef CONFIG_SET_COLORMAP
int prom_set_color(prom_handle device, int color, int r, int g, int b)
{
     return (int)call_prom( "call-method", 6, 1, "color!", device, color, b, g, r );
}
#endif /* CONFIG_SET_COLORMAP */

void
prom_exit ()
{
     call_prom ("exit", 0, 0);
}

void
prom_abort (char *fmt, ...)
{
     va_list ap;
     va_start (ap, fmt);
     prom_vfprintf (prom_stdout, fmt, ap);
     va_end (ap);
     prom_exit ();
}

void
prom_sleep (int seconds)
{
     int end;
     end = (prom_getms() + (seconds * 1000));
     while (prom_getms() <= end);
}

void *
prom_claim (void *virt, unsigned int size, unsigned int align)
{
     return call_prom ("claim", 3, 1, virt, size, align);
}

void
prom_release(void *virt, unsigned int size)
{
     call_prom ("release", 2, 0, virt, size);
#if 0 /* this is bullshit, newworld OF RELEASE method works fine. */

     /* release in not enough, it needs also an unmap call. This bit of forth
      * code inspired from Darwin's bootloader but could be replaced by direct
      * calls to the MMU package if needed
      */
     call_prom ("interpret", 3, 1,
#if DEBUG
            ".\" ReleaseMem:\" 2dup . . cr "
#endif
            "over \" translate\" ^mmu "         // Find out physical base
            "^on0 "                             // Bail if translation failed
            "drop "                             // Leaving phys on top of stack
            "2dup \" unmap\" ^mmu "             // Unmap the space first
            "2dup \" release\" ^mmu "           // Then free the virtual pages
            "\" release\" ^mem "                // Then free the physical pages
            ,size, virt 
        );
#endif /* bullshit */
}

void
prom_map (void *phys, void *virt, int size)
{
     unsigned long msr = mfmsr();

     /* Only create a mapping if we're running with relocation enabled. */
     if ( (msr & MSR_IR) && (msr & MSR_DR) )
        call_method_1 ("map", prom_mmu, 4, -1, size, virt, phys);
}

void
prom_unmap (void *phys, void *virt, int size)
{
     unsigned long msr = mfmsr();

     /* Only unmap if we're running with relocation enabled. */
     if ( (msr & MSR_IR) && (msr & MSR_DR) )
        call_method_1 ("map", prom_mmu, 4, -1, size, virt, phys);
}

char *
prom_getargs ()
{
     static char args[256];
     int l;

     l = prom_get_chosen ("bootargs", args, 255);
     args[l] = '\0';
     return args;
}

void
prom_setargs (char *args)
{
     int l = strlen (args)+1;
     if ((int)call_prom ("setprop", 4, 1, prom_chosen, "bootargs", args, l) != l)
        prom_printf ("can't set args\n");
}

int prom_interpret (char *forth)
{
     return (int)call_prom("interpret", 1, 1, forth);
}

int
prom_getms(void)
{
     return (int) call_prom("milliseconds", 0, 1);
}

void
prom_pause(void)
{
     call_prom("enter", 0, 0);
}

/* 
 * Local variables:
 * c-file-style: "k&r"
 * c-basic-offset: 5
 * End:
 */

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