New subject: [RFC][PATCH] coreboot: Add support for a "links" file to have aliases in CBFS.

1 Feb 2014

On Thu, Jan 30, 2014 at 12:30:11PM -0500, Kevin O'Connor wrote:
...
The "links" file is a newline separated list where each line is a
"link name" followed by a "destination name" separated by a space
character.  For each line, SeaBIOS will consider each "link name" to
be a CBFS file that has the contents found in the CBFS file with
"destination name".
Signed-off-by: Kevin O'Connor kevin@koconnor.net
This patch may be useful for those using intel option roms where the
same rom is used on a number of VGA devices with different
vendor/device ids.  With this patch, one can make a "links" file with
the list of devices (eg, "pci8086,0a06.rom") that all point to the
same physical rom (eg, "pci8086,0406.rom").
It's possible to implement this aliasing approach in a number of
different ways.  The approach taken in this patch is a single file
with all the link names.  This was done based on feedback that there
could be 20 or more aliases for a single rom and creating individual
CBFS files for each link would be unwieldy.
That said, I'm not sure this is the best approach.  I'm circulating it
for comments.
FYI, below is a version of the patch with a more resilent parser.
Same comments as above.
-Kevin
...
From 1e44227576fc76d81bfd3ee5ccb32bca827f17b1 Mon Sep 17 00:00:00 2001
Message-Id: 1e44227576fc76d81bfd3ee5ccb32bca827f17b1.1391213161.git.kevin@koconnor.net
From: Kevin O'Connor kevin@koconnor.net
Date: Fri, 17 Jan 2014 12:11:49 -0500
Subject: [PATCH] coreboot: Add support for a "links" file to have aliases in
 CBFS.
To: seabios@seabios.org
The "links" file is a newline separated list where each line is a
"link name" followed by a "destination name" separated by a space
character.  For each line, SeaBIOS will consider each "link name" to
be a CBFS file that has the contents found in the CBFS file with
"destination name".
Signed-off-by: Kevin O'Connor kevin@koconnor.net
---
 src/fw/coreboot.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/src/fw/coreboot.c b/src/fw/coreboot.c
index df8fca8..cfb7a70 100644
--- a/src/fw/coreboot.c
+++ b/src/fw/coreboot.c
@@ -408,6 +408,45 @@ coreboot_cbfs_init(void)
         fhdr = (void*)ALIGN((u32)cfile->data + cfile->rawsize
                             , be32_to_cpu(hdr->align));
     }
+
+    // Process CBFS links file.  The links file is a newline separated
+    // file where each line has a "link name" and a "destination name"
+    // separated by a space character.
+    char *links = romfile_loadfile("links", NULL), *next = links;
+    while (next) {
+        // Parse out linkname and destname
+        char *linkname = next;
+        next = strchr(linkname, '\n');
+        if (next)
+            *next++ = '\0';
+        while (*linkname && *linkname <= ' ')
+            linkname++;
+        char *comment = strchr(linkname, '#');
+        if (comment)
+            *comment = '\0';
+        nullTrailingSpace(linkname);
+        char *destname = strchr(linkname, ' ');
+        if (!destname)
+            continue;
+        *destname++ = '\0';
+        while (*destname && *destname <= ' ')
+            destname++;
+        // Lookup destname and create new romfile entry for linkname
+        struct romfile_s *ufile = romfile_find(destname);
+        if (!ufile)
+            continue;
+        struct cbfs_romfile_s *cufile
+            = container_of(ufile, struct cbfs_romfile_s, file);
+        struct cbfs_romfile_s *cfile = malloc_tmp(sizeof(*cfile));
+        if (!cfile) {
+            warn_noalloc();
+            break;
+        }
+        memcpy(cfile, cufile, sizeof(*cfile));
+        strtcpy(cfile->file.name, linkname, sizeof(cfile->file.name));
+        romfile_add(&cfile->file);
+    }
+    free(links);
 }
struct cbfs_payload_segment {
-- 
1.8.5.3



    

Re: [SeaBIOS] [RFC][PATCH] coreboot: Add support for a "links" file to have aliases in CBFS.

Signed-off-by: Kevin O'Connor kevin@koconnor.net