Re: [SeaBIOS] [PATCH 1/8] Add "romfile" code to assist with extract integer config settings.

[Wayne Xia]

    Hi, I tried the patch 1 and 2, and tested it with qemu passing
data, it seems good. thanks.

于 2011-7-6 9:08, Kevin O'Connor 写道:

Add romfile_loadint() function which can be used to extract a
little-endian binary encoded integer from rom.
---
  src/paravirt.c |   19 +++++++++++++++++++
  src/paravirt.h |    1 +
  2 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/src/paravirt.c b/src/paravirt.c
index 09e3d23..9cf77de 100644
--- a/src/paravirt.c
+++ b/src/paravirt.c
@@ -409,3 +409,22 @@ romfile_loadfile(const char *name, int *psize)
      data[filesize] = '\0';
      return data;
  }
+
+// Attempt to load an integer from the given file - return 'defval'
+// if unsuccesful.
+u64
+romfile_loadint(const char *name, u64 defval)
+{
+    u32 file = romfile_find(name);
+    if (!file)
+        return defval;
+
+    int filesize = romfile_size(file);
+    if (!filesize || filesize>  sizeof(u64) || (filesize&  (filesize-1)))
+        // Doesn't look like a valid integer.
+        return defval;
+
+    u64 val = 0;
+    romfile_copy(file,&val, sizeof(val));
+    return val;
+}
diff --git a/src/paravirt.h b/src/paravirt.h
index 7bf34b1..83166f4 100644
--- a/src/paravirt.h
+++ b/src/paravirt.h
@@ -101,6 +101,7 @@ static inline const char* romfile_name(u32 fileid) {
      return qemu_cfg_name_file(fileid);
  }
  void *romfile_loadfile(const char *name, int *psize);
+u64 romfile_loadint(const char *name, u64 defval);

  u32 qemu_cfg_e820_entries(void);
  void* qemu_cfg_e820_load_next(void *addr);

--
Best Regards

Wayne Xia
mail:xiaw...@linux.vnet.ibm.com
tel:86-010-82450803


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