summaryrefslogtreecommitdiff
path: root/i386/i386at/model_dep.c
diff options
context:
space:
mode:
authorThomas Schwinge <tschwinge@gnu.org>2006-02-20 20:20:17 +0000
committerThomas Schwinge <tschwinge@gnu.org>2009-06-18 00:26:34 +0200
commitcbec31f150fe055d3c778ca352ae212ec023c08c (patch)
treee86916241f33bcad4a3087501302b94efa286ded /i386/i386at/model_dep.c
parent68754c496b16c6416ee601d6d9cc634e91e3b9f1 (diff)
2006-02-20 Thomas Schwinge <tschwinge@gnu.org>
Remove unused and unsupported code. Consult the file `DEVELOPMENT' for details. Partly based on suggestions by Gianluca Guida <glguida@gmail.com>. * i386/bogus/nscsi.h: Remove file. * i386/i386at/model_dep.c: Don't include <nscsi.h> anymore and adopt all users of NSCSI as if it were always defined to `0'. (use_all_mem): Don't define anymore and adopt all users as if it were always defined to `1'. (NBBY, NBPW, DMA_MAX): Remove macros. (alloc_dma_mem): Remove function.
Diffstat (limited to 'i386/i386at/model_dep.c')
-rw-r--r--i386/i386at/model_dep.c131
1 files changed, 1 insertions, 130 deletions
diff --git a/i386/i386at/model_dep.c b/i386/i386at/model_dep.c
index f3a210d..8975805 100644
--- a/i386/i386at/model_dep.c
+++ b/i386/i386at/model_dep.c
@@ -83,20 +83,6 @@ static vm_offset_t avail_next = 0x1000; /* XX end of BIOS data area */
still remaining to be handed to the VM system. */
static vm_size_t avail_remaining;
-/* Configuration parameter:
- if zero, only use physical memory in the low 16MB of addresses.
- Only SCSI still has DMA problems. */
-#ifdef LINUX_DEV
-#define use_all_mem 1
-#else
-#include "nscsi.h"
-#if NSCSI > 0
-#define use_all_mem 0
-#else
-#define use_all_mem 1
-#endif
-#endif
-
extern char version[];
extern void setup_main();
@@ -221,11 +207,6 @@ mem_size_init()
printf("AT386 boot: physical memory from 0x%x to 0x%x\n",
phys_first_addr, phys_last_addr);
- if ((!use_all_mem) && phys_last_addr > 16 * 1024*1024) {
- printf("** Limiting useable memory to 16 Meg to avoid DMA problems.\n");
- /* This is actually enforced below, in init_alloc_aligned. */
- }
-
phys_first_addr = round_page(phys_first_addr);
phys_last_addr = trunc_page(phys_last_addr);
}
@@ -475,7 +456,7 @@ init_alloc_aligned(vm_size_t size, vm_offset_t *addrp)
avail_next = round_page(avail_next);
/* Start with memory above 16MB, reserving the low memory for later. */
- if (use_all_mem && !wrapped && phys_last_addr > 16 * 1024*1024)
+ if (!wrapped && phys_last_addr > 16 * 1024*1024)
{
if (avail_next < 16 * 1024*1024)
avail_next = 16 * 1024*1024;
@@ -509,11 +490,6 @@ init_alloc_aligned(vm_size_t size, vm_offset_t *addrp)
goto retry;
}
- /* If we're only supposed to use the low 16 megs, enforce that. */
- if ((!use_all_mem) && (addr >= 16 * 1024*1024)) {
- return FALSE;
- }
-
/* Skip our own kernel code, data, and bss. */
if ((avail_next > (vm_offset_t)start) && (addr < (vm_offset_t)end))
{
@@ -584,108 +560,3 @@ boolean_t pmap_valid_page(x)
return (((phys_first_addr <= x) && (x < phys_last_addr)) &&
!(((boot_info.mem_lower * 1024) <= x) && (x < 1024*1024)));
}
-
-#ifndef NBBY
-#define NBBY 8
-#endif
-#ifndef NBPW
-#define NBPW (NBBY * sizeof(int))
-#endif
-#define DMA_MAX (16*1024*1024)
-
-/*
- * Allocate contiguous pages below 16 MB
- * starting at specified boundary for DMA.
- */
-vm_offset_t
-alloc_dma_mem(size, align)
- vm_size_t size;
- vm_offset_t align;
-{
- int *bits, i, j, k, n;
- int npages, count, bit, mask;
- int first_page, last_page;
- vm_offset_t addr;
- vm_page_t p, prevp;
-
- npages = round_page(size) / PAGE_SIZE;
- mask = align ? (align - 1) / PAGE_SIZE : 0;
-
- /*
- * Allocate bit array.
- */
- n = ((DMA_MAX / PAGE_SIZE) + NBPW - 1) / NBPW;
- i = n * NBPW;
- bits = (unsigned *)kalloc(i);
- if (bits == 0) {
- printf("alloc_dma_mem: unable alloc bit array\n");
- return (0);
- }
- bzero((char *)bits, i);
-
- /*
- * Walk the page free list and set a bit for
- * every usable page in bit array.
- */
- simple_lock(&vm_page_queue_free_lock);
- for (p = vm_page_queue_free; p; p = (vm_page_t)p->pageq.next) {
- if (p->phys_addr < DMA_MAX) {
- i = p->phys_addr / PAGE_SIZE;
- bits[i / NBPW] |= 1 << (i % NBPW);
- }
- }
-
- /*
- * Search for contiguous pages by scanning bit array.
- */
- for (i = 0, first_page = -1; i < n; i++) {
- for (bit = 1, j = 0; j < NBPW; j++, bit <<= 1) {
- if (bits[i] & bit) {
- if (first_page < 0) {
- k = i * NBPW + j;
- if (!mask
- || (((k & mask) + npages)
- <= mask + 1)) {
- first_page = k;
- if (npages == 1)
- goto found;
- count = 1;
- }
- } else if (++count == npages)
- goto found;
- } else
- first_page = -1;
- }
- }
- addr = 0;
- goto out;
-
- found:
- /*
- * Remove pages from the free list.
- */
- addr = first_page * PAGE_SIZE;
- last_page = first_page + npages;
- vm_page_free_count -= npages;
- p = vm_page_queue_free;
- prevp = 0;
- while (1) {
- i = p->phys_addr / PAGE_SIZE;
- if (i >= first_page && i < last_page) {
- if (prevp)
- prevp->pageq.next = p->pageq.next;
- else
- vm_page_queue_free = (vm_page_t)p->pageq.next;
- p->free = FALSE;
- if (--npages == 0)
- break;
- } else
- prevp = p;
- p = (vm_page_t)p->pageq.next;
- }
-
- out:
- simple_unlock(&vm_page_queue_free_lock);
- kfree((vm_offset_t)bits, n * NBPW);
- return (addr);
-}