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author | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2013-12-29 12:07:54 +0200 |
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committer | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2014-11-14 15:44:56 +0100 |
commit | abc083e06bcb8d20a58d04323d5c6da7313f987d (patch) | |
tree | 60e5d06fa1178a71f21df2779f8ea84bf6be886f /src/mainboard/tyan/s2735 | |
parent | 3eefeea9d58ab2896aec7ded7aa1a15e8e9fa72c (diff) | |
download | coreboot-abc083e06bcb8d20a58d04323d5c6da7313f987d.tar.xz |
AMD (K8/fam10): Rewrite CAR migration in post_cache_as_ram
Old routine copied all of CAR region as-is right below CONFIG_RAMTOP.
Most of this region was reserved to interleave AP CPU address spaces
and unused on BSP CPU. The only part of CAR region requiring a copy
in RAM is the sysinfo structure.
Improved routine changes this as follows:
A region of size 'backup_size' below CONFIG_RAMTOP is cleared. In
case of S3 resume, OS context from this region is first copied to
high memory (CBMEM_ID_RESUME).
At stack switch, CAR stack is discarded. Top of the stack for BSP
is located at 'CONFIG_RAMTOP - car_size' for the remaining part
of the romstage. This region is part of 'backup_size' and was zeroed
before the switch took place.
Before CAR is torn down the region of CAR_GLOBALS (and CAR_CBMEM),
including the relevant sysinfo data for AP nodes memory training,
is copied at 'CONFIG_RAMTOP - car_size'.
NOTE: While CAR_GLOBAL variables are recovered, there are currently
no means to calculate their offsets in RAM.
NOTE: Boards with multiple CPU packages are likely already broken since
bbc880ee amdk8/amdfam10: Use CAR_GLOBAL for sysinfo
This moved the copy of sysinfo in RAM from above the stack to below
the stack, but code for AP CPU's was not adjusted accordingly.
Change-Id: Ie45b576aec6a2e006bfcb26b52fdb77c24f72e3b
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/4583
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Diffstat (limited to 'src/mainboard/tyan/s2735')
0 files changed, 0 insertions, 0 deletions