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Add execute in place to lar. Allows code to be run from the ROM.

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Signed-off-by: Marc Jones <marc.jones@amd.com> 
Acked-by: Ronald G. Minnich <rminnich@gmail.com> 



git-svn-id: svn://coreboot.org/repository/LinuxBIOSv3@458 f3766cd6-281f-0410-b1cd-43a5c92072e9
This commit is contained in:
Marc Jones 2007-07-19 15:03:05 +00:00
parent 396fdc33a7
commit b48030fa84
2 changed files with 31 additions and 4 deletions
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1
include/lar.h
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@ -76,5 +76,6 @@ struct mem_file {
int find_file(struct mem_file *archive, char *filename, struct mem_file *result);
int copy_file(struct mem_file *archive, char *filename, void *where);
int run_file(struct mem_file *archive, char *filename, void *where);
int execute_in_place(struct mem_file *archive, char *filename);
#endif /* LAR_H */

34
lib/lar.c
View file

@ -3,6 +3,7 @@
*
* Copyright (C) 2006-2007 coresystems GmbH
* (Written by Stefan Reinauer <stepan@coresystems.de> for coresystems GmbH)
* Copyright (C) 2007 Advanced Micro Devices, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -103,16 +104,41 @@ int copy_file(struct mem_file *archive, char *filename, void *where)
return 1;
}
/**
* Find the file in the LAR header, copy it to the desired location,
* and execute it. A location of 0xFFFFFFFF means execute in place (XIP).
*/
int run_file(struct mem_file *archive, char *filename, void *where)
{
int (*v) (void);
struct mem_file result;
if (copy_file(archive, filename, where)) {
printk(BIOS_INFO, "LAR: Run file %s failed: No such file.\n",
filename);
return 1;
if ((u32) where != 0xFFFFFFFF) {
if (copy_file(archive, filename, where)) {
printk(BIOS_INFO,
"LAR: Run file %s failed: No such file.\n",
filename);
return 1;
}
} else { /* XIP */
if (find_file(archive, filename, &result)) {
printk(BIOS_INFO,
"LAR: Run file %s failed: No such file.\n",
filename);
return 1;
}
where = result.start;
}
v = where;
return v();
}
/**
* Call run_file() to execute in place.
*/
int execute_in_place(struct mem_file *archive, char *filename)
{
return run_file(archive, filename, (void *) 0xFFFFFFFF);
}