Improved algorithm that calculates the pages in the base memory - If the
BIOS says that the amount is *between* 0-640K, believe it. Cleaned up the comments a bit, removed some old cruff, etc.
This commit is contained in:
dg
parent
dc667448a8
commit
a4f9fb09d6
@ -35,7 +35,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
|
||||
* $Id: machdep.c,v 1.24 1994/01/03 07:55:21 davidg Exp $
|
||||
* $Id: machdep.c,v 1.25 1994/01/14 16:23:35 davidg Exp $
|
||||
*/
|
||||
|
||||
#include "npx.h"
|
||||
@ -86,9 +86,6 @@ extern vm_offset_t avail_start, avail_end;
|
||||
static void identifycpu(void);
|
||||
static void initcpu(void);
|
||||
|
||||
#define EXPECT_BASEMEM 640 /* The expected base memory*/
|
||||
#define INFORM_WAIT 1 /* Set to pause berfore crash in weird cases*/
|
||||
|
||||
#ifndef PANIC_REBOOT_WAIT_TIME
|
||||
#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
|
||||
#endif
|
||||
@ -1053,48 +1050,43 @@ init386(first)
|
||||
*/
|
||||
biosbasemem = rtcin(RTC_BASELO)+ (rtcin(RTC_BASEHI)<<8);
|
||||
biosextmem = rtcin(RTC_EXTLO)+ (rtcin(RTC_EXTHI)<<8);
|
||||
/*printf("bios base %d ext %d ", biosbasemem, biosextmem);*/
|
||||
|
||||
/*
|
||||
* 15 Aug 92 Terry Lambert The real fix for the CMOS bug
|
||||
* If BIOS tells us that it has more than 640k in the basemem,
|
||||
* don't believe it - set it to 640k.
|
||||
*/
|
||||
if (biosbasemem != EXPECT_BASEMEM) {
|
||||
printf("Warning: Base memory %dK, assuming %dK\n", biosbasemem, EXPECT_BASEMEM);
|
||||
biosbasemem = EXPECT_BASEMEM; /* assume base*/
|
||||
}
|
||||
if (biosbasemem > 640)
|
||||
biosbasemem = 640;
|
||||
|
||||
/*
|
||||
* Some 386 machines might give us a bogus number for extended
|
||||
* mem. If this happens, stop now.
|
||||
*/
|
||||
#ifndef LARGEMEM
|
||||
if (biosextmem > 65536) {
|
||||
printf("Warning: Extended memory %dK(>64M), assuming 0K\n", biosextmem);
|
||||
biosextmem = 0; /* assume none*/
|
||||
panic("extended memory beyond limit of 64MB");
|
||||
/* NOT REACHED */
|
||||
}
|
||||
#endif
|
||||
|
||||
pagesinbase = biosbasemem * 1024 / NBPG;
|
||||
pagesinext = biosextmem * 1024 / NBPG;
|
||||
|
||||
/*
|
||||
* Go into normal calculation; Note that we try to run in 640K, and
|
||||
* that invalid CMOS values of non 0xffff are no longer a cause of
|
||||
* ptdi problems. I have found a gutted kernel can run in 640K.
|
||||
* Maxmem isn't the "maximum memory", it's the highest page of
|
||||
* of the physical address space. It should be "Maxphyspage".
|
||||
*/
|
||||
pagesinbase = 640/4 - first/NBPG;
|
||||
pagesinext = biosextmem/4;
|
||||
/* use greater of either base or extended memory. do this
|
||||
* until I reinstitue discontiguous allocation of vm_page
|
||||
* array.
|
||||
*/
|
||||
if (pagesinbase > pagesinext)
|
||||
Maxmem = 640/4;
|
||||
else {
|
||||
Maxmem = pagesinext + 0x100000/NBPG;
|
||||
}
|
||||
|
||||
/* This used to explode, since Maxmem used to be 0 for bas CMOS*/
|
||||
#ifdef MAXMEM
|
||||
if (MAXMEM/4 < Maxmem)
|
||||
Maxmem = MAXMEM/4;
|
||||
#endif
|
||||
maxmem = Maxmem - 1; /* highest page of usable memory */
|
||||
physmem = maxmem; /* number of pages of physmem addr space */
|
||||
/*printf("using first 0x%x to 0x%x\n ", first, maxmem*NBPG);*/
|
||||
if (maxmem < 2048/4) {
|
||||
panic("Too little RAM memory.\n");
|
||||
|
||||
if (Maxmem < 2048/4) {
|
||||
panic("Too little memory (2MB required)");
|
||||
/* NOT REACHED */
|
||||
}
|
||||
|
||||
@ -1106,12 +1098,15 @@ init386(first)
|
||||
* later in vm_page_startup.
|
||||
*/
|
||||
/* avail_start and avail_end are initialized in pmap_bootstrap */
|
||||
phys_avail[0] = 0x1000; /* memory up to the ISA hole */
|
||||
phys_avail[1] = 0xa0000;
|
||||
phys_avail[2] = avail_start; /* memory up to the end */
|
||||
phys_avail[3] = avail_end;
|
||||
phys_avail[4] = 0; /* no more chunks */
|
||||
phys_avail[5] = 0;
|
||||
x = 0;
|
||||
if (pagesinbase > 1) {
|
||||
phys_avail[x++] = NBPG; /* skip first page of memory */
|
||||
phys_avail[x++] = pagesinbase * NBPG; /* memory up to the ISA hole */
|
||||
}
|
||||
phys_avail[x++] = avail_start; /* memory up to the end */
|
||||
phys_avail[x++] = avail_end;
|
||||
phys_avail[x++] = 0; /* no more chunks */
|
||||
phys_avail[x++] = 0;
|
||||
|
||||
/* now running on new page tables, configured,and u/iom is accessible */
|
||||
|
||||
|
||||
@ -35,7 +35,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
|
||||
* $Id: machdep.c,v 1.24 1994/01/03 07:55:21 davidg Exp $
|
||||
* $Id: machdep.c,v 1.25 1994/01/14 16:23:35 davidg Exp $
|
||||
*/
|
||||
|
||||
#include "npx.h"
|
||||
@ -86,9 +86,6 @@ extern vm_offset_t avail_start, avail_end;
|
||||
static void identifycpu(void);
|
||||
static void initcpu(void);
|
||||
|
||||
#define EXPECT_BASEMEM 640 /* The expected base memory*/
|
||||
#define INFORM_WAIT 1 /* Set to pause berfore crash in weird cases*/
|
||||
|
||||
#ifndef PANIC_REBOOT_WAIT_TIME
|
||||
#define PANIC_REBOOT_WAIT_TIME 15 /* default to 15 seconds */
|
||||
#endif
|
||||
@ -1053,48 +1050,43 @@ init386(first)
|
||||
*/
|
||||
biosbasemem = rtcin(RTC_BASELO)+ (rtcin(RTC_BASEHI)<<8);
|
||||
biosextmem = rtcin(RTC_EXTLO)+ (rtcin(RTC_EXTHI)<<8);
|
||||
/*printf("bios base %d ext %d ", biosbasemem, biosextmem);*/
|
||||
|
||||
/*
|
||||
* 15 Aug 92 Terry Lambert The real fix for the CMOS bug
|
||||
* If BIOS tells us that it has more than 640k in the basemem,
|
||||
* don't believe it - set it to 640k.
|
||||
*/
|
||||
if (biosbasemem != EXPECT_BASEMEM) {
|
||||
printf("Warning: Base memory %dK, assuming %dK\n", biosbasemem, EXPECT_BASEMEM);
|
||||
biosbasemem = EXPECT_BASEMEM; /* assume base*/
|
||||
}
|
||||
if (biosbasemem > 640)
|
||||
biosbasemem = 640;
|
||||
|
||||
/*
|
||||
* Some 386 machines might give us a bogus number for extended
|
||||
* mem. If this happens, stop now.
|
||||
*/
|
||||
#ifndef LARGEMEM
|
||||
if (biosextmem > 65536) {
|
||||
printf("Warning: Extended memory %dK(>64M), assuming 0K\n", biosextmem);
|
||||
biosextmem = 0; /* assume none*/
|
||||
panic("extended memory beyond limit of 64MB");
|
||||
/* NOT REACHED */
|
||||
}
|
||||
#endif
|
||||
|
||||
pagesinbase = biosbasemem * 1024 / NBPG;
|
||||
pagesinext = biosextmem * 1024 / NBPG;
|
||||
|
||||
/*
|
||||
* Go into normal calculation; Note that we try to run in 640K, and
|
||||
* that invalid CMOS values of non 0xffff are no longer a cause of
|
||||
* ptdi problems. I have found a gutted kernel can run in 640K.
|
||||
* Maxmem isn't the "maximum memory", it's the highest page of
|
||||
* of the physical address space. It should be "Maxphyspage".
|
||||
*/
|
||||
pagesinbase = 640/4 - first/NBPG;
|
||||
pagesinext = biosextmem/4;
|
||||
/* use greater of either base or extended memory. do this
|
||||
* until I reinstitue discontiguous allocation of vm_page
|
||||
* array.
|
||||
*/
|
||||
if (pagesinbase > pagesinext)
|
||||
Maxmem = 640/4;
|
||||
else {
|
||||
Maxmem = pagesinext + 0x100000/NBPG;
|
||||
}
|
||||
|
||||
/* This used to explode, since Maxmem used to be 0 for bas CMOS*/
|
||||
#ifdef MAXMEM
|
||||
if (MAXMEM/4 < Maxmem)
|
||||
Maxmem = MAXMEM/4;
|
||||
#endif
|
||||
maxmem = Maxmem - 1; /* highest page of usable memory */
|
||||
physmem = maxmem; /* number of pages of physmem addr space */
|
||||
/*printf("using first 0x%x to 0x%x\n ", first, maxmem*NBPG);*/
|
||||
if (maxmem < 2048/4) {
|
||||
panic("Too little RAM memory.\n");
|
||||
|
||||
if (Maxmem < 2048/4) {
|
||||
panic("Too little memory (2MB required)");
|
||||
/* NOT REACHED */
|
||||
}
|
||||
|
||||
@ -1106,12 +1098,15 @@ init386(first)
|
||||
* later in vm_page_startup.
|
||||
*/
|
||||
/* avail_start and avail_end are initialized in pmap_bootstrap */
|
||||
phys_avail[0] = 0x1000; /* memory up to the ISA hole */
|
||||
phys_avail[1] = 0xa0000;
|
||||
phys_avail[2] = avail_start; /* memory up to the end */
|
||||
phys_avail[3] = avail_end;
|
||||
phys_avail[4] = 0; /* no more chunks */
|
||||
phys_avail[5] = 0;
|
||||
x = 0;
|
||||
if (pagesinbase > 1) {
|
||||
phys_avail[x++] = NBPG; /* skip first page of memory */
|
||||
phys_avail[x++] = pagesinbase * NBPG; /* memory up to the ISA hole */
|
||||
}
|
||||
phys_avail[x++] = avail_start; /* memory up to the end */
|
||||
phys_avail[x++] = avail_end;
|
||||
phys_avail[x++] = 0; /* no more chunks */
|
||||
phys_avail[x++] = 0;
|
||||
|
||||
/* now running on new page tables, configured,and u/iom is accessible */
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user