Hi,
After reading the e820 method from Ralf Brown's interrupt list(
http://www.ctyme.com/intr/rb-1741.htm)
it seems that the es register wont get thrashed. So there is no need to
repatedly execute (for getting each map entry) the following two lines
inside jmpe820: of seutp.S and thus can be moved out as below. Is there
any reason to do it inside?
pushw %ds
popw %es
jmpe820:
movl $0x0000e820, %eax # e820, upper word zeroed
movl $SMAP, %edx # ascii 'SMAP'
movl $20, %ecx # size of the e820rec
# pushw %ds # data record.
# popw %es
Diff
-------
===== setup.S 1.22 vs edited =====
318a319,320
> pushw %ds
> popw %es
324,325c326,327
< pushw %ds # data record.
< popw %es
--- > # pushw %ds # data record. > # popw %es 1156d1157 <Tested in my i386 machine and here is the relevant portion of dmesg after boot.
> Linux version 2.6.0-test1 (root@feynman) (gcc version 3.2 20020903 > (Red Hat Linux 8.0 3.2-7)) #14 Thu Jul 17 01:05:15 SGT 2003 > Video mode to be used for restore is f00 > BIOS-provided physical RAM map: > BIOS-e820: 0000000000000000 - 000000000009f800 (usable) > BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved) > BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved) > BIOS-e820: 0000000000100000 - 0000000017ff0000 (usable) > BIOS-e820: 0000000017ff0000 - 0000000017ffec00 (ACPI data) > BIOS-e820: 0000000017ffec00 - 0000000018000000 (ACPI NVS) > BIOS-e820: 00000000fff80000 - 0000000100000000 (reserved) > 0MB HIGHMEM available. > 383MB LOWMEM available. > On node 0 totalpages: 98288
Regards, -Romit
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This archive was generated by hypermail 2b29 : Wed Jul 23 2003 - 22:00:25 EST