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https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
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cf6044857e
Write a quick and dirty testing program to dump physical memory to help test and debug the smbios.c code in new environments. Sponsored by: Netflix Differential Revision: https://reviews.freebsd.org/D39791
97 lines
1.6 KiB
C
97 lines
1.6 KiB
C
/*
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* Copyright (c) 2023 Warner Losh
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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/*
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* Test program for smbios support in the boot loader. This program will mmap
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* physical memory, and print the smbios table at the passed in PA. This is
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* intended to test the code and debug problems in a debugger friendly
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* environment.
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*/
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#include <sys/param.h>
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#define setenv my_setenv
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#define SMBIOS_SERIAL_NUMBERS 1
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#define SMBIOS_LITTLE_ENDIAN_UUID 1
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#include <arpa/inet.h>
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#include "smbios.h"
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#include "smbios.c"
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#include <sys/mman.h>
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#define MAX_MAP 10
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#define PAGE (64<<10)
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static struct mapping
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{
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uintptr_t pa;
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caddr_t va;
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} map[MAX_MAP];
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static int fd;
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static int nmap;
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caddr_t ptov(uintptr_t pa)
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{
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caddr_t va;
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uintptr_t pa2;
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struct mapping *m = map;
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pa2 = rounddown(pa, PAGE);
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for (int i = 0; i < nmap; i++, m++) {
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if (m->pa == pa2) {
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return (m->va + pa - m->pa);
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}
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}
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if (nmap == MAX_MAP)
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errx(1, "Too many maps");
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va = mmap(0, PAGE, PROT_READ, MAP_SHARED, fd, pa2);
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if (va == MAP_FAILED)
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err(1, "mmap offset %#lx", (long)pa2);
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m = &map[nmap++];
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m->pa = pa2;
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m->va = va;
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return (m->va + pa - m->pa);
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}
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static void
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cleanup(void)
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{
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for (int i = 0; i < nmap; i++) {
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munmap(map[i].va, PAGE);
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}
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}
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int
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my_setenv(const char *name, const char *value, int overwrite __unused)
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{
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printf("%s=%s\n", name, value);
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return 0;
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}
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static void
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usage(void)
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{
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errx(1, "smbios address");
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}
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int
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main(int argc, char **argv)
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{
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uintptr_t addr;
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if (argc != 2)
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usage();
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addr = strtoull(argv[1], NULL, 0);
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/* For mmap later */
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fd = open("/dev/mem", O_RDONLY);
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if (fd < 0)
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err(1, "Opening /dev/mem");
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smbios_detect(ptov(addr));
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cleanup();
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}
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