[PATCH v2 1/2] Add romfile_loadfile_low

[Riku Viitanen]

Useful for MXM structures for example: it needs to be in low memory,
since the VGA BIOS needs to access it in real mode.

Signed-off-by: Riku Viitanen 
---
 src/romfile.c | 30 ++++++++++++++++++++++++++++++
 src/romfile.h |  1 +
 2 files changed, 31 insertions(+)

diff --git a/src/romfile.c b/src/romfile.c
index b598274e..5d80d809 100644
--- a/src/romfile.c
+++ b/src/romfile.c
@@ -78,6 +78,36 @@ romfile_loadfile(const char *name, int *psize)
     return data;
 }

+// Helper function to find, malloc_low, and copy a romfile.
+void *
+romfile_loadfile_low(const char *name, int *psize)
+{
+    struct romfile_s *file = romfile_find(name);
+    if (!file)
+        return NULL;
+
+    int filesize = file->size;
+    if (!filesize)
+        return NULL;
+
+    char *data = malloc_low(filesize);
+    if (!data) {
+        warn_noalloc();
+        return NULL;
+    }
+
+    dprintf(5, "Copying romfile '%s' (len %d) to low memory\n",
+            name, filesize);
+    int ret = file->copy(file, data, filesize);
+    if (ret < 0) {
+        free(data);
+        return NULL;
+    }
+    if (psize)
+        *psize = filesize;
+    return data;
+}
+
 // Attempt to load an integer from the given file - return 'defval'
 // if unsuccessful.
 u64
diff --git a/src/romfile.h b/src/romfile.h
index 3e0f8200..70111ac2 100644
--- a/src/romfile.h
+++ b/src/romfile.h
@@ -14,6 +14,7 @@ void romfile_add(struct romfile_s *file);
 struct romfile_s *romfile_findprefix(const char *prefix, struct romfile_s *prev);
 struct romfile_s *romfile_find(const char *name);
 void *romfile_loadfile(const char *name, int *psize);
+void *romfile_loadfile_low(const char *name, int *psize);
 u64 romfile_loadint(const char *name, u64 defval);

void const_romfile_add_int(char *name, u32 value);
--
2.43.2