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implement Configflash;
#
# this isn't a proper config program: it's currently just
# enough to set important parameters such as ethernet address.
# an extension is in the works.
# --chf
include "sys.m";
sys: Sys;
include "draw.m";
include "string.m";
str: String;
Configflash: module
{
init: fn(nil: ref Draw->Context, args: list of string);
};
Region: adt {
base: int;
limit: int;
};
#
# structure of allocation descriptor
#
Fcheck: con 0;
Fbase: con 4;
Flen: con 8;
Ftag: con 11;
Fsig: con 12;
Fasize: con 3*4+3+1;
Tdead: con byte 0;
Tboot: con byte 16r01;
Tconf: con byte 16r02;
Tnone: con byte 16rFF;
flashsig := array[] of {byte 16rF1, byte 16rA5, byte 16r5A, byte 16r1F};
noval := array[] of {0 to 3 =>byte 16rFF}; #
Ctag, Cscreen, Cconsole, Cbaud, Cether, Cea, Cend: con iota;
config := array[] of {
Ctag => "#plan9.ini\n", # current flag for qboot, don't change
Cscreen => "vgasize=640x480x8\n",
Cconsole => "console=0 lcd\n",
Cbaud => "baud=9600\n",
Cether => "ether0=type=SCC port=2 ", # note missing \n
Cea => "ea=08003e400080\n",
Cend => "\0" # qboot currently requires it but shouldn't
};
Param: adt {
name: string;
index: int;
};
params := array[] of {
Param("vgasize", Cscreen),
Param("console", Cconsole),
Param("ea", Cea),
Param("baud", Cbaud)
};
# could come from file or #F/flash/flashctl
FLASHSEG: con 256*1024;
bootregion := Region(0, FLASHSEG);
stderr: ref Sys->FD;
prog := "qconfig";
damaged := 0;
debug := 0;
usage()
{
sys->fprint(stderr, "Usage: %s [-D] [-f flash] [-param value ...]\n", prog);
exit;
}
err(s: string)
{
sys->fprint(stderr, "%s: %s", prog, s);
if(!damaged)
sys->fprint(stderr, "; flash not modified\n");
else
sys->fprint(stderr, "; flash might now be invalid\n");
exit;
}
init(nil: ref Draw->Context, args: list of string)
{
sys = load Sys Sys->PATH;
sys->pctl(Sys->FORKFD|Sys->NEWPGRP, nil);
stderr = sys->fildes(2);
if(args != nil){
prog = hd args;
args = tl args;
}
str = load String String->PATH;
if(str == nil)
err(sys->sprint("can't load %s: %r", String->PATH));
flash := "#F/flash/flash";
offset := 0;
region := bootregion;
for(; args != nil && (hd args)[0] == '-'; args = tl args)
case a := hd args {
"-f" =>
(flash, args) = argf(tl args);
"-D" =>
debug = 1;
* =>
p := lookparam(params, a[1:]);
if(p.index < 0)
err(sys->sprint("unknown config parameter: %s", a));
v: string;
(v, args) = argf(tl args);
config[p.index] = a[1:]+"="+v+"\n"; # would be nice to check it
}
if(len args > 0)
usage();
out := sys->open(flash, Sys->ORDWR);
if(out == nil)
err(sys->sprint("can't open %s for read/write: %r", flash));
# TO DO: hunt for free space and add new entry
plonk(out, FLASHSEG-Fasize, mkdesc(0, 128*1024, Tboot));
c := flatten(config);
if(debug)
sys->print("%s", c);
bconf := array of byte c;
plonk(out, FLASHSEG-Fasize*2, mkdesc(128*1024, len bconf, Tconf));
plonk(out, 128*1024, bconf);
}
argf(args: list of string): (string, list of string)
{
if(args == nil)
usage();
return (hd args, args);
}
lookparam(options: array of Param, s: string): Param
{
for(i := 0; i < len options; i++)
if(options[i].name == s)
return options[i];
return Param(nil, -1);
}
flatten(a: array of string): string
{
s := "";
for(i := 0; i < len a; i++)
s += a[i];
return s;
}
plonk(out: ref Sys->FD, where: int, val: array of byte)
{
if(debug){
sys->print("write #%ux [%d]:", where, len val);
for(i:=0; i<len val; i++)
sys->print(" %.2ux", int val[i]);
sys->print("\n");
}
sys->seek(out, big where, 0);
if(sys->write(out, val, len val) != len val)
err(sys->sprint("bad flash write: %r"));
}
cvt(v: int): array of byte
{
a := array[4] of byte;
a[0] = byte (v>>24);
a[1] = byte (v>>16);
a[2] = byte (v>>8);
a[3] = byte (v & 16rff);
return a;
}
mkdesc(base: int, length: int, tag: byte): array of byte
{
a := array[Fasize] of byte;
a[Fcheck:] = noval;
a[Fbase:] = cvt(base);
a[Flen:] = cvt(length)[1:]; # it's three bytes
a[Ftag] = tag;
a[Fsig:] = flashsig;
return a;
}
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