src/soc/decoder/isa/caller.py

   1 from functools import wraps
   2 from soc.decoder.orderedset import OrderedSet
   3 from soc.decoder.selectable_int import SelectableInt, selectconcat
   4
   5 def create_args(reglist, extra=None):
   6     args = OrderedSet()
   7     for reg in reglist:
   8         args.add(reg)
   9     args = list(args)
  10     if extra:
  11         args = [extra] + args
  12     return args
  13
  14 class Mem:
  15
  16     def __init__(self):
  17         self.mem = []
  18         for i in range(128):
  19             self.mem.append(i)
  20
  21     def __call__(self, addr, sz):
  22         res = []
  23         for s in range(sz): # TODO: big/little-end
  24             res.append(SelectableInt(self.mem[addr.value + s], 8))
  25         print ("memread", addr, sz, res)
  26         return selectconcat(*res)
  27
  28     def memassign(self, addr, sz, val):
  29         print ("memassign", addr, sz, val)
  30         for s in range(sz):
  31             byte = (val.value) >> (s*8) & 0xff # TODO: big/little-end
  32             self.mem[addr.value + s] = byte
  33
  34
  35 class GPR(dict):
  36     def __init__(self, decoder, regfile):
  37         dict.__init__(self)
  38         self.sd = decoder
  39         for i in range(32):
  40             self[i] = SelectableInt(regfile[i], 64)
  41
  42     def __call__(self, ridx):
  43         return self[ridx]
  44
  45     def set_form(self, form):
  46         self.form = form
  47
  48     def getz(self, rnum):
  49         #rnum = rnum.value # only SelectableInt allowed
  50         print("GPR getzero", rnum)
  51         if rnum == 0:
  52             return SelectableInt(0, 64)
  53         return self[rnum]
  54
  55     def _get_regnum(self, attr):
  56         getform = self.sd.sigforms[self.form]
  57         rnum = getattr(getform, attr)
  58         return rnum
  59
  60     def ___getitem__(self, attr):
  61         print("GPR getitem", attr)
  62         rnum = self._get_regnum(attr)
  63         return self.regfile[rnum]
  64
  65
  66 class ISACaller:
  67     # decoder2 - an instance of power_decoder2
  68     # regfile - a list of initial values for the registers
  69     def __init__(self, decoder2, regfile):
  70         self.gpr = GPR(decoder2, regfile)
  71         self.mem = Mem()
  72         self.namespace = {'GPR': self.gpr,
  73                           'MEM': self.mem,
  74                           'memassign': self.memassign
  75                           }
  76         self.decoder = decoder2
  77
  78     def memassign(self, ea, sz, val):
  79         self.mem.memassign(ea, sz, val)
  80
  81     def prep_namespace(self):
  82         si = yield self.decoder.SI
  83         self.namespace.SI = SelectableInt(si, bits=16)
  84
  85     def call(self, name):
  86         function, read_regs, uninit_regs, write_regs = self.instrs[name]
  87         input_names = create_args(read_regs | uninit_regs)
  88         print(input_names)
  89
  90         inputs = []
  91         for name in input_names:
  92             regnum = yield getattr(self.decoder, name)
  93             print('reading reg %d' % regnum)
  94             inputs.append(self.gpr(regnum))
  95         print(inputs)
  96         results = function(self, *inputs)
  97         print(results)
  98
  99         output_names = create_args(write_regs)
 100         for name, output in zip(output_names, results):
 101             regnum = yield getattr(self.decoder, name)
 102             print('writing reg %d' % regnum)
 103             self.gpr[regnum] = output
 104
 105
 106 def inject():
 107     """ Decorator factory. """
 108     def variable_injector(func):
 109         @wraps(func)
 110         def decorator(*args, **kwargs):
 111             try:
 112                 func_globals = func.__globals__  # Python 2.6+
 113             except AttributeError:
 114                 func_globals = func.func_globals  # Earlier versions.
 115
 116             context = args[0].namespace
 117             saved_values = func_globals.copy()  # Shallow copy of dict.
 118             func_globals.update(context)
 119
 120             result = func(*args, **kwargs)
 121             #exec (func.__code__, func_globals)
 122
 123             #finally:
 124             #    func_globals = saved_values  # Undo changes.
 125
 126             return result
 127
 128         return decorator
 129
 130     return variable_injector
 131