Messages in this thread | | | Date | Fri, 22 Dec 2000 21:33:58 +0200 | From | Petri Kaukasoina <> | Subject | Re: Linux 2.2.19pre3 |
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On Fri, Dec 22, 2000 at 12:52:32AM +0000, Alan Cox wrote: > > 2.2.19pre3 > o Fix e820 handling (Andrea Arcangeli)
arch/i386/kernel/setup.c:
/* compare results from other methods and take the greater */ if (ALT_MEM_K < EXT_MEM_K) { mem_size = EXT_MEM_K; who = "BIOS-88"; } else { mem_size = ALT_MEM_K; who = "BIOS-e801"; } e820.nr_map = 0; - add_memory_region(0, LOWMEMSIZE(), E820_RAM); - add_memory_region(HIGH_MEMORY, mem_size << 10, E820_RAM); + add_memory_region(0, i386_endbase, E820_RAM); + add_memory_region(HIGH_MEMORY, (mem_size << 10)-HIGH_MEMORY, + E820_RAM);
I think in case of BIOS-88 it now sees 1 Meg less than should. int 15, ah=88 gives the amount of extended memory above 1 Meg and it gets copied to EXT_MEM_K. So HIGH_MEMORY should not be subtracted from it. (On the other hand in case of BIOS-e801 ALT_MEM_K includes lower memory. I guess the direct comparison of memory sizes ALT_MEM_K and EXT_MEM_K is not ok.)
linux-2.2.19pre3 on my 486 with 49152 k of RAM:
BIOS-provided physical RAM map: BIOS-88: 000a0000 @ 00000000 (usable) BIOS-88: 02e00000 @ 00100000 (usable) Memory: 46128k/48128k available
linux-2.2.18 or linux-2.2.19pre2 :
Memory: 47144k/49152k available - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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