diff options
| author | Aaron Durbin <adurbin@chromium.org> | 2013-02-08 17:28:04 -0600 |
|---|---|---|
| committer | Stefan Reinauer <stefan.reinauer@coreboot.org> | 2013-03-21 22:28:28 +0100 |
| commit | 8e4a355773cc64a89b3fc4d79981cfb02bda7e66 (patch) | |
| tree | 01a9e6d5fc66568fd5c318e5edf17d47e73f65e8 /src/lib/selfboot.c | |
| parent | 43e4a80a92bf00540e4d9b0734eb53f32044226f (diff) | |
| download | coreboot-8e4a355773cc64a89b3fc4d79981cfb02bda7e66.tar.xz | |
coreboot: introduce CONFIG_RELOCATABLE_RAMSTAGE
This patch adds an option to build the ramstage as a reloctable binary.
It uses the rmodule library for the relocation. The main changes
consist of the following:
1. The ramstage is loaded just under the cmbem space.
2. Payloads cannot be loaded over where ramstage is loaded. If a payload
is attempted to load where the relocatable ramstage resides the load
is aborted.
3. The memory occupied by the ramstage is reserved from the OS's usage
using the romstage_handoff structure stored in cbmem. This region is
communicated to ramstage by an CBMEM_ID_ROMSTAGE_INFO entry in cbmem.
4. There is no need to reserve cbmem space for the OS controlled memory for
the resume path because the ramsage region has been reserved in #3.
5. Since no memory needs to be preserved in the wake path, the loading
and begin of execution of a elf payload is straight forward.
Change-Id: Ia66cf1be65c29fa25ca7bd9ea6c8f11d7eee05f5
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/2792
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>
Diffstat (limited to 'src/lib/selfboot.c')
| -rw-r--r-- | src/lib/selfboot.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/lib/selfboot.c b/src/lib/selfboot.c index f32bb814fb..f933142144 100644 --- a/src/lib/selfboot.c +++ b/src/lib/selfboot.c @@ -78,6 +78,16 @@ struct segment { static unsigned long bounce_size, bounce_buffer; +#if CONFIG_RELOCATABLE_RAMSTAGE +static void get_bounce_buffer(struct lb_memory *mem, unsigned long req_size) +{ + /* When the ramstage is relocatable there is no need for a bounce + * buffer. All payloads should not overlap the ramstage. + */ + bounce_buffer = ~0UL; + bounce_size = 0; +} +#else static void get_bounce_buffer(struct lb_memory *mem, unsigned long req_size) { unsigned long lb_size; @@ -114,6 +124,7 @@ static void get_bounce_buffer(struct lb_memory *mem, unsigned long req_size) bounce_buffer = buffer; bounce_size = req_size; } +#endif /* CONFIG_RELOCATABLE_RAMSTAGE */ static int valid_area(struct lb_memory *mem, unsigned long buffer, unsigned long start, unsigned long len) @@ -394,8 +405,13 @@ static int load_self_segments( for(ptr = head->next; ptr != head; ptr = ptr->next) { if (!overlaps_coreboot(ptr)) continue; +#if CONFIG_RELOCATABLE_RAMSTAGE + /* payloads are required to not overlap ramstage. */ + return 0; +#else if (ptr->s_dstaddr + ptr->s_memsz > bounce_high) bounce_high = ptr->s_dstaddr + ptr->s_memsz; +#endif } get_bounce_buffer(mem, bounce_high - lb_start); if (!bounce_buffer) { |