[SeaBIOS] [PATCH 2/4] acpi: add aml/asl parsing script

[Michael S. Tsirkin]

I've rewritten the script in python. Seems to work but
I didn't have time to test - only compiled for now -
and needs to move to tools - but I hope this makes
review easier.

Thanks,

---
 src/find_ej0.py |  140 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 140 insertions(+), 0 deletions(-)
 create mode 100755 src/find_ej0.py

diff --git a/src/find_ej0.py b/src/find_ej0.py
new file mode 100755
index 0000000..75e5491
--- /dev/null
+++ b/src/find_ej0.py
@@ -0,0 +1,140 @@
+#!/usr/bin/python
+
+# Process mixed ASL/AML listing (.lst file) produced by iasl -l
+# Locate all occurences of Name _ADR followed by Method EJ0_
+# Output slot info from _ADR and offset of method name in AML
+
+import re;
+import sys;
+import fileinput;
+
+aml = []
+asl = []
+output = []
+lineno = 0
+debug = ""
+
+class asl_line:
+    line = None
+    lineno = None
+    aml_offset = None
+
+def die(diag):
+    sys.stderr.write("Error: %s; %s\n" % (diag, debug))
+    sys.exit(1)
+    
+#Store an ASL command, matching AML offset, and input line (for debugging)
+def add_asl(line):
+    l = asl_line()
+    l.line = line
+    l.lineno = lineno
+    l.aml_offset = len(aml)
+    asl.append(l)
+
+#Store an AML byte sequence
+#Verify that offset output by iasl matches # of bytes so far
+def add_aml(offset, line):
+    o = int(offset, 16);
+    # Sanity check: offset must match size of code so far
+    if (o != len(aml)):
+        die("Offset 0x%x != 0x%x" % (o, len(aml)))
+    # Strip any trailing dots and ASCII dump after "
+    line = re.sub(r'\s*\.*\s*".*$',"", line)
+    # Strip traling whitespace
+    line = re.sub(r'\s+$',"", line)
+    # Strip leading whitespace
+    line = re.sub(r'^\s+',"", line)
+    # Split on whitespace
+    code = re.split(r'\s+', line)
+    for c in code:
+        # Require a legal hex number, two digits
+        if (not(re.search(r'^[0-9A-Fa-f][0-9A-Fa-f]$', c))):
+            die("Unexpected octet %s" % c);
+        aml.append(int(c, 16));
+
+# Process aml bytecode array, decoding AML
+# Given method offset, find its name offset
+def aml_method_name(lineno, offset):
+    #0x14 MethodOp PkgLength NameString MethodFlags TermList
+    if (aml[offset] != 0x14):
+        die( "Method after input line $lineno offset $offset: "
+            " expected 0x14 actual 0x%x" % aml[offset]);
+    offset += 1;
+    # PkgLength can be multibyte. Bits 8-7 give the # of extra bytes.
+    pkglenbytes = aml[offset] >> 6;
+    offset += 1 + pkglenbytes;
+    return offset;
+
+for line in fileinput.input():
+    # Strip trailing newline
+    line.rstrip();
+    # line number and debug string to output in case of errors
+    lineno = lineno + 1
+    debug = "input line %d: %s" % (lineno, line)
+    #ASL listing: space, then line#, then ...., then code
+    pasl = re.compile('^\s+([0-9]+)\.\.\.\.\s*')
+    m = pasl.search(line)
+    if (m):
+        add_asl(pasl.sub("", line));
+    # AML listing: offset in hex, then ...., then code
+    paml = re.compile('^([0-9A-Fa-f]+)\.\.\.\.\s*')
+    m = paml.search(line)
+    if (m):
+        add_aml(m.group(1), paml.sub("", line))
+
+# Now go over code, look for EJ0_ methods
+# For each such method, output slot mask from the
+# preceding _ADR line, as well as the method name offset.
+
+for i in range(len(asl)):
+    l = asl[i].line
+    debug = "input line %d: %s" % (asl[i].lineno, asl[i].line)
+    # match: Method (EJ0_,1)
+    if (not(re.search(r'^Method\s*\(\s*EJ0_\s*[,)]', l))):
+        # Make sure we do not miss any EJ0_:
+        # die if EJ0_ is found anywhere else in source code
+        if (re.search(r'EJ0_', l)):
+            die("Stray EJ0_ detected");
+        continue
+    # EJ0_ found. Previous line must be _ADR
+    p = asl[i - 1].line
+    # match: Name (_ADR, 0x<address>)
+    padr = re.compile('Name\s*\(\s*_ADR\s*,\s*0x([0-9A-Fa-f]+)\s*\)')
+    m = padr.search(p);
+    if (not m):
+        die("_ADR not found before EJ0_ ")
+
+    adr = int(m.group(1), 16)
+    slot = adr >> 16;
+    if (slot > 31):
+        die("_ADR device out of range: actual %d expected 0 to 31" % slot)
+
+    # We have offset of EJ0_ method in code
+    # Now find EJ0_ itself
+    ej0 = aml_method_name(asl[i].lineno, asl[i].aml_offset)
+    # Verify AML: name must be EJ0_:
+    if ((aml[ej0 + 0] != ord('E')) or
+        (aml[ej0 + 1] != ord('J')) or
+        (aml[ej0 + 2] != ord('0')) or
+        (aml[ej0 + 3] != ord('_'))):
+        die("AML offset 0x%x does not match EJ0_" % ej0)
+
+    # OK we are done. Output slot mask and offset
+    output.append("    {.slot_mask = 0x%x, .offset = 0x%x}" %
+                  (0x1 << slot, ej0))
+
+debug = "at end of file"
+
+# Pretty print output
+if (not len(output)):
+    die("No EJ0_ Method found!")
+
+print '''
+static struct aml_ej0_data {
+    unsigned slot_mask;
+    unsigned offset;
+} aml_ej0_data[] = {'''
+
+print ",\n".join(output)
+print '};\n'
+
-- 
1.7.5.53.gc233e