3c8bfb5ddd
Adds data offset to PCI expansion ROM Data Structure in resource describing Expansion ROMs. This allows AHCI OROM scanning function to identify AHCI OROM by device id 0x2822 and vendor id 0x8086. Signed-off-by: Marcin Labun <marcin.labun@intel.com> Signed-off-by: NeilBrown <neilb@suse.de>
320 lines
6.7 KiB
C
320 lines
6.7 KiB
C
/*
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* probe_roms - scan for Adapter ROMS
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*
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* (based on linux-2.6:arch/x86/kernel/probe_roms_32.c)
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*
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* Copyright (C) 2008 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "probe_roms.h"
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#include "mdadm.h"
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#include <unistd.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <asm/types.h>
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static void *rom_mem = MAP_FAILED;
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static int rom_fd = -1;
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static const int rom_len = 0xf0000 - 0xc0000; /* option-rom memory region */
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static int _sigbus;
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static unsigned long rom_align;
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#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
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static void sigbus(int sig)
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{
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_sigbus = 1;
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}
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static int probe_address8(const __u8 *ptr, __u8 *val)
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{
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int rc = 0;
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*val = *ptr;
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if (_sigbus)
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rc = -1;
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_sigbus = 0;
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return rc;
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}
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static int probe_address16(const __u16 *ptr, __u16 *val)
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{
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int rc = 0;
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*val = *ptr;
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if (_sigbus)
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rc = -1;
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_sigbus = 0;
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return rc;
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}
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void probe_roms_exit(void)
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{
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signal(SIGBUS, SIG_DFL);
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if (rom_fd >= 0) {
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close(rom_fd);
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rom_fd = -1;
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}
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if (rom_mem != MAP_FAILED) {
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munmap(rom_mem, rom_len);
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rom_mem = MAP_FAILED;
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}
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}
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int probe_roms_init(unsigned long align)
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{
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int fd = -1;
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int rc = 0;
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/* valid values are 2048 and 512. 512 is for PCI-3.0 compliant
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* systems, or systems that do not have dangerous/legacy ISA
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* devices. 2048 should always be safe
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*/
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if (align == 512 || align == 2048)
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rom_align = align;
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else
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return -1;
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if (signal(SIGBUS, sigbus) == SIG_ERR)
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rc = -1;
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if (rc == 0) {
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fd = open("/dev/mem", O_RDONLY);
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if (fd < 0)
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rc = -1;
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}
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if (rc == 0) {
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rom_mem = mmap(NULL, rom_len, PROT_READ, MAP_PRIVATE, fd, 0xc0000);
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if (rom_mem == MAP_FAILED)
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rc = -1;
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}
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if (rc == 0)
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rom_fd = fd;
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else {
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if (fd >= 0)
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close(fd);
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probe_roms_exit();
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}
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return rc;
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}
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/**
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* isa_bus_to_virt - convert physical address to mmap'd region
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* @addr - address to convert
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*
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* Only valid between a successful call to probe_roms_init and the
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* corresponding probe_roms_exit
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*/
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static void *isa_bus_to_virt(unsigned long addr)
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{
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return rom_mem + (addr - 0xc0000);
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}
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struct resource {
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unsigned long start;
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unsigned long end;
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unsigned long data;
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const char *name;
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};
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static struct resource system_rom_resource = {
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.name = "System ROM",
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.start = 0xf0000,
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.data = 0,
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.end = 0xfffff,
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};
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static struct resource extension_rom_resource = {
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.name = "Extension ROM",
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.start = 0xe0000,
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.data = 0,
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.end = 0xeffff,
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};
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static struct resource adapter_rom_resources[] = { {
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.name = "Adapter ROM",
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.start = 0xc8000,
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.data = 0,
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.end = 0,
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}, {
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.name = "Adapter ROM",
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.start = 0,
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.data = 0,
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.end = 0,
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}, {
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.name = "Adapter ROM",
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.start = 0,
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.data = 0,
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.end = 0,
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}, {
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.name = "Adapter ROM",
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.start = 0,
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.data = 0,
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.end = 0,
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}, {
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.name = "Adapter ROM",
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.start = 0,
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.data = 0,
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.end = 0,
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}, {
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.name = "Adapter ROM",
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.start = 0,
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.data = 0,
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.end = 0,
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} };
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static struct resource video_rom_resource = {
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.name = "Video ROM",
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.start = 0xc0000,
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.data = 0,
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.end = 0xc7fff,
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};
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#define ROMSIGNATURE 0xaa55
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static int romsignature(const unsigned char *rom)
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{
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const unsigned short * const ptr = (const unsigned short *)rom;
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unsigned short sig = 0;
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return probe_address16(ptr, &sig) == 0 && sig == ROMSIGNATURE;
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}
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static int romchecksum(const unsigned char *rom, unsigned long length)
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{
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unsigned char sum, c;
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for (sum = 0; length && probe_address8(rom++, &c) == 0; length--)
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sum += c;
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return !length && !sum;
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}
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int scan_adapter_roms(scan_fn fn)
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{
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/* let scan_fn examing each of the adapter roms found by probe_roms */
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unsigned int i;
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int found;
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if (rom_fd < 0)
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return 0;
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found = 0;
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for (i = 0; i < ARRAY_SIZE(adapter_rom_resources); i++) {
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struct resource *res = &adapter_rom_resources[i];
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if (res->start) {
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found = fn(isa_bus_to_virt(res->start),
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isa_bus_to_virt(res->end),
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isa_bus_to_virt(res->data));
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if (found)
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break;
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} else
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break;
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}
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return found;
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}
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static unsigned long align(unsigned long addr, unsigned long alignment)
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{
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return (addr + alignment - 1) & ~(alignment - 1);
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}
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void probe_roms(void)
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{
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const void *rom;
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unsigned long start, length, upper;
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unsigned char c;
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unsigned int i;
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__u16 val=0;
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if (rom_fd < 0)
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return;
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/* video rom */
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upper = adapter_rom_resources[0].start;
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for (start = video_rom_resource.start; start < upper; start += rom_align) {
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rom = isa_bus_to_virt(start);
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if (!romsignature(rom))
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continue;
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video_rom_resource.start = start;
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if (probe_address8(rom + 2, &c) != 0)
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continue;
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/* 0 < length <= 0x7f * 512, historically */
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length = c * 512;
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/* if checksum okay, trust length byte */
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if (length && romchecksum(rom, length))
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video_rom_resource.end = start + length - 1;
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break;
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}
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start = align(video_rom_resource.end + 1, rom_align);
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if (start < upper)
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start = upper;
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/* system rom */
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upper = system_rom_resource.start;
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/* check for extension rom (ignore length byte!) */
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rom = isa_bus_to_virt(extension_rom_resource.start);
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if (romsignature(rom)) {
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length = extension_rom_resource.end - extension_rom_resource.start + 1;
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if (romchecksum(rom, length))
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upper = extension_rom_resource.start;
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}
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/* check for adapter roms on 2k boundaries */
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for (i = 0; i < ARRAY_SIZE(adapter_rom_resources) && start < upper; start += rom_align) {
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rom = isa_bus_to_virt(start);
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if (!romsignature(rom))
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continue;
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if (probe_address8(rom + 2, &c) != 0)
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continue;
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/* 0 < length <= 0x7f * 512, historically */
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length = c * 512;
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/* Retrieve 16-bit pointer to PCI Data Structure (offset 18h-19h)
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* The data can be within 64KB forward of the first location
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* of this code image. The pointer is in little-endian order
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*/
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if (probe_address16(rom + 0x18, &val) != 0)
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continue;
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val = __le16_to_cpu(val);
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/* but accept any length that fits if checksum okay */
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if (!length || start + length > upper || !romchecksum(rom, length))
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continue;
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adapter_rom_resources[i].start = start;
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adapter_rom_resources[i].data = start + (unsigned long) val;
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adapter_rom_resources[i].end = start + length - 1;
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start = adapter_rom_resources[i++].end & ~(rom_align - 1);
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}
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}
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