Hi all,
I am trying to understand how post_cache_as_ram() function works. As we
know, there are two main parts of coreboot, which are cache_as_ram part
and ram part. post_caches_as_ram function tries to copy data from
cache_as_ram to ram.
I am very confused about the memory calculation such as
CONFIG_DCACHE_RAM_BASE + CONFIG_DCACHE_RAM_SIZE - CONFIG_RAMTOP
I would appreciate if someone could explain a little bit for me.
CONFIG_DCACHE_RAM_BASE
CONFIG_DCACHE_RAM_SIZE
CONFIG_RAM_SIZE
CONFIG_RAMTOP
In addition, why do we need to set new esp here?
/* set new esp */ /* before CONFIG_RAMBASE */
"subl %0, %%esp\n\t"
::"a"( (CONFIG_DCACHE_RAM_BASE + CONFIG_DCACHE_RAM_SIZE)-
(CONFIG_RAMTOP) )
Best,
Fengwei
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