a5d7d93911
PowerPC Apple hardware, and likely all Open Firmware systems. The loader would allocate memory for its heap at whatever address Open Firmware gave it, which would in general be the lowest unallocated address, usually starting a page or two above 0. As the kernel is linked at 1 MB, and loader insists on running the kernel at its link address, any heap larger than 1 MB would overlap the kernel, causing loader memory allocations to corrupt the kernel and vice versa. Although r328806 made this problem much worse by increasing the heap size to 8 MB, causing 88% of the loader heap to overlap with the kernel, the problem has always existed. The old heap size was 1 MB and, unless that started exactly at zero, which would cause other problems, some number of pages of the loader heap still overlapped with the kernel. This patch solves the issue in two ways and cleans up some related code: - Moves the loader heap inside of the loader. This guarantees that the heap will be contiguous with the loader and simplifies the heap allocation code at no cost, since the heap lives in BSS. - Moves the loader, previously at 28 MB and dangerously close to the kernel it loads, a bit higher to 44 MB. This has the effect of breaking loader on non-embedded PPC machines with < 48 MB of RAM, but we did not support those anyway. The fundamental problem is that the way loader loads ELF files is incredibly fragile, but that can't be fixed without fundamental architectural changes. MFC after: 10 days
115 lines
3.2 KiB
C
115 lines
3.2 KiB
C
/*-
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* Copyright (c) 2001 Benno Rice
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/types.h>
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#include <stand.h>
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#include "libofw.h"
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#include "openfirm.h"
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struct ofw_mapping {
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vm_offset_t va;
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int len;
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vm_offset_t pa;
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int mode;
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};
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struct ofw_mapping2 {
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vm_offset_t va;
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int len;
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vm_offset_t pa_hi;
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vm_offset_t pa_lo;
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int mode;
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};
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void
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ofw_memmap(int acells)
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{
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struct ofw_mapping *mapptr;
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struct ofw_mapping2 *mapptr2;
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phandle_t mmup;
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int nmapping, i;
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u_char mappings[256 * sizeof(struct ofw_mapping2)];
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char lbuf[80];
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mmup = OF_instance_to_package(mmu);
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bzero(mappings, sizeof(mappings));
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nmapping = OF_getprop(mmup, "translations", mappings, sizeof(mappings));
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if (nmapping == -1) {
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printf("Could not get memory map (%d)\n",
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nmapping);
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return;
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}
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pager_open();
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if (acells == 1) {
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nmapping /= sizeof(struct ofw_mapping);
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mapptr = (struct ofw_mapping *) mappings;
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printf("%17s\t%17s\t%8s\t%6s\n", "Virtual Range",
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"Physical Range", "#Pages", "Mode");
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for (i = 0; i < nmapping; i++) {
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sprintf(lbuf, "%08x-%08x\t%08x-%08x\t%8d\t%6x\n",
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mapptr[i].va,
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mapptr[i].va + mapptr[i].len,
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mapptr[i].pa,
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mapptr[i].pa + mapptr[i].len,
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mapptr[i].len / 0x1000,
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mapptr[i].mode);
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if (pager_output(lbuf))
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break;
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}
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} else {
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nmapping /= sizeof(struct ofw_mapping2);
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mapptr2 = (struct ofw_mapping2 *) mappings;
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printf("%17s\t%17s\t%8s\t%6s\n", "Virtual Range",
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"Physical Range", "#Pages", "Mode");
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for (i = 0; i < nmapping; i++) {
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sprintf(lbuf, "%08x-%08x\t%08x-%08x\t%8d\t%6x\n",
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mapptr2[i].va,
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mapptr2[i].va + mapptr2[i].len,
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mapptr2[i].pa_lo,
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mapptr2[i].pa_lo + mapptr2[i].len,
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mapptr2[i].len / 0x1000,
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mapptr2[i].mode);
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if (pager_output(lbuf))
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break;
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}
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}
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pager_close();
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}
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