x86: memtest: cleanup memtest function
[linux-2.6/mini2440.git] / arch / x86 / kernel / head.c
blob3e66bd364a9db3cf8f3fb624f96eeb7075364d78
1 #include <linux/kernel.h>
2 #include <linux/init.h>
4 #include <asm/setup.h>
5 #include <asm/bios_ebda.h>
7 #define BIOS_LOWMEM_KILOBYTES 0x413
9 /*
10 * The BIOS places the EBDA/XBDA at the top of conventional
11 * memory, and usually decreases the reported amount of
12 * conventional memory (int 0x12) too. This also contains a
13 * workaround for Dell systems that neglect to reserve EBDA.
14 * The same workaround also avoids a problem with the AMD768MPX
15 * chipset: reserve a page before VGA to prevent PCI prefetch
16 * into it (errata #56). Usually the page is reserved anyways,
17 * unless you have no PS/2 mouse plugged in.
19 void __init reserve_ebda_region(void)
21 unsigned int lowmem, ebda_addr;
23 /* To determine the position of the EBDA and the */
24 /* end of conventional memory, we need to look at */
25 /* the BIOS data area. In a paravirtual environment */
26 /* that area is absent. We'll just have to assume */
27 /* that the paravirt case can handle memory setup */
28 /* correctly, without our help. */
29 if (paravirt_enabled())
30 return;
32 /* end of low (conventional) memory */
33 lowmem = *(unsigned short *)__va(BIOS_LOWMEM_KILOBYTES);
34 lowmem <<= 10;
36 /* start of EBDA area */
37 ebda_addr = get_bios_ebda();
39 /* Fixup: bios puts an EBDA in the top 64K segment */
40 /* of conventional memory, but does not adjust lowmem. */
41 if ((lowmem - ebda_addr) <= 0x10000)
42 lowmem = ebda_addr;
44 /* Fixup: bios does not report an EBDA at all. */
45 /* Some old Dells seem to need 4k anyhow (bugzilla 2990) */
46 if ((ebda_addr == 0) && (lowmem >= 0x9f000))
47 lowmem = 0x9f000;
49 /* Paranoia: should never happen, but... */
50 if ((lowmem == 0) || (lowmem >= 0x100000))
51 lowmem = 0x9f000;
53 /* reserve all memory between lowmem and the 1MB mark */
54 reserve_early_overlap_ok(lowmem, 0x100000, "BIOS reserved");