Merge "Extract coreboot console from ramdump Script to extract cbmem console...

Merge "Extract coreboot console from ramdump Script to extract cbmem console area from ramdumps. The start address and length is taken from kernel symbol cbmem_console."

linux-ramdump-parser-v2/parsers/cbmem.py

+# Copyright (c) 2018, The Linux Foundation. All rights reserved.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 and
+# only version 2 as published by the Free Software Foundation.
+#
+# 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.
+
+from parser_util import cleanupString
+from parser_util import register_parser, RamParser
+from print_out import print_out_str
+
+# This is hardcoded since coreboot console is always at below physical address
+#addr1 = 0xfffde000
+#len1 = 0x20000
+CBMC_CURSOR_MASK = ((1 << 28) - 1)
+CBMC_OVERFLOW = (1 << 31)
+
+@register_parser('--cbmem', 'Print the coreboot console log', shortopt='-z')
+class CBMEM(RamParser):
+
+
+    def print_cbmem(self, cbmem_out):
+        #get starting address of cbmem_console
+        #get the size of console
+        cbmem_console_addr = self.ramdump.read_u64('cbmem_console')
+        cbmem_console_size = self.ramdump.read_u16('cbmem_console_size')
+        if (cbmem_console_addr is None) or (cbmem_console_size is None):
+            print_out_str('cbmem_console stucture not found')
+            return
+        #read the valie of cbmem_console->cursor.  getting offset and reading u32
+        cursor_offset = self.ramdump.field_offset('struct cbmem_cons', 'cursor')
+        cbmem_console_cusor = self.ramdump.read_u16(cbmem_console_addr+cursor_offset)
+
+        #convert the console address to Phy and read full untill size
+        addr = self.ramdump.virt_to_phys(cbmem_console_addr)
+        cbmem = self.ramdump.read_physical(addr, cbmem_console_cusor+8)
+        size = self.ramdump.sizeof('struct cbmem_console')
+        cursor = cbmem_console_cusor & CBMC_CURSOR_MASK
+        if (not(cbmem_console_cusor & CBMC_OVERFLOW) and cursor < cbmem_console_size):
+            size = cursor
+        else:
+            size = cbmem_console_size
+        if (cbmem_console_cusor & CBMC_OVERFLOW):
+            if (cursor >= size):
+                print_out_str("cbmem: ERROR: CBMEM console struct is illegal, "
+                       "output may be corrupt or out of order!\n\n")
+                cursor = 0
+            cbmem = self.ramdump.read_physical(addr+cursor, size-cursor)
+            cbmemPart1 = self.ramdump.read_physical(addr, cursor)
+            cbmem_out.write(cleanupString(cbmem.decode('ascii', 'ignore')) + '\n')
+            cbmem_out.write(cleanupString(cbmemPart1.decode('ascii', 'ignore')) + '\n')
+        else:
+            cbmem = self.ramdump.read_physical(addr, size)
+            cbmem_out.write(cleanupString(cbmem.decode('ascii', 'ignore')) + '\n')
+
+            print_out_str('Wrote Coreboot console log to cbmem.txt')
+    def parse(self):
+        cbmem_out = self.ramdump.open_file('cbmem.txt')
+        self.print_cbmem(cbmem_out)
+        cbmem_out.close()
+