John Baldwin wrote:
On Monday 19 December 2005 01:32 pm, Maxim Sobolev wrote:
John Baldwin wrote:
On Monday 19 December 2005 04:26 am, Maxim Sobolev wrote:
sobomax 2005-12-19 09:26:42 UTC
FreeBSD src repository
Modified files:
sys/boot/i386/loader main.c
Log:
If LOADER_BZIP2_SUPPORT is defined allocate heap in the 1MB-4MB range
to provide enough room for decompression (up to 2.5MB is necessary).
This should be safe to do since we load i386 kernels after 8MB mark now,
so that 16MB is the minimum amount of RAM necessary to even boot
FreeBSD.
Err, I thought we loaded PAE kernels at 2MB and non-PAE kernels at 4MB to
skip the first PSE page (PSE pages are 2MB on PAE).
You are right, my mistake, sorry. In any case memory in the range
1MB-4MB can be used by default.
Errm, no it can't. PAE kernels (and amd64 kernels I think) are both loaded at
2MB, so that only leaves memory in the range 1MB-2MB.
I see, did not know about amd64 (PAE is less a concern for me since it's
not a default kernel). What do you think about the following patch:
http://www.pbxpress.com/~sobomax/loader.diff
It moves heap to the top of the extended memory and teaches
i386_copyin() to avoid messing up this region, so that in low memory
situation it will just fail, not trash heap.
-Maxim
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