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278e79707e
attributes for preloaded modules/images. In particular, MODINFO_ADDR has the added complexity of not always being relocated properly. Rather than kluging this in the various components that are affected, we handle it in a centralized place (preload_fetch_addr()). To that end, expose a new variable, preload_addr_relocate, that MD initialization code can set and that turns the address attribute into a valid kernel VA. Architectures that need the relocation: arm & powerpc (at least). Components that can utilize this: acpi(4), md(4), fb(4), pci(4), ZFS, geli. Sponsored by: Juniper Networks
291 lines
6.5 KiB
C
291 lines
6.5 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith
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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 THE AUTHOR AND CONTRIBUTORS ``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 AUTHOR 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/systm.h>
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#include <sys/linker.h>
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/*
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* Preloaded module support
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*/
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vm_offset_t preload_addr_relocate = 0;
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caddr_t preload_metadata;
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/*
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* Search for the preloaded module (name)
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*/
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caddr_t
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preload_search_by_name(const char *name)
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{
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caddr_t curp;
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uint32_t *hdr;
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int next;
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if (preload_metadata != NULL) {
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curp = preload_metadata;
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for (;;) {
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hdr = (uint32_t *)curp;
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if (hdr[0] == 0 && hdr[1] == 0)
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break;
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/* Search for a MODINFO_NAME field */
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if ((hdr[0] == MODINFO_NAME) &&
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!strcmp(name, curp + sizeof(uint32_t) * 2))
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return(curp);
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/* skip to next field */
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next = sizeof(uint32_t) * 2 + hdr[1];
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next = roundup(next, sizeof(u_long));
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curp += next;
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}
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}
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return(NULL);
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}
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/*
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* Search for the first preloaded module of (type)
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*/
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caddr_t
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preload_search_by_type(const char *type)
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{
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caddr_t curp, lname;
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uint32_t *hdr;
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int next;
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if (preload_metadata != NULL) {
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curp = preload_metadata;
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lname = NULL;
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for (;;) {
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hdr = (uint32_t *)curp;
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if (hdr[0] == 0 && hdr[1] == 0)
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break;
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/* remember the start of each record */
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if (hdr[0] == MODINFO_NAME)
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lname = curp;
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/* Search for a MODINFO_TYPE field */
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if ((hdr[0] == MODINFO_TYPE) &&
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!strcmp(type, curp + sizeof(uint32_t) * 2))
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return(lname);
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/* skip to next field */
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next = sizeof(uint32_t) * 2 + hdr[1];
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next = roundup(next, sizeof(u_long));
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curp += next;
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}
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}
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return(NULL);
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}
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/*
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* Walk through the preloaded module list
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*/
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caddr_t
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preload_search_next_name(caddr_t base)
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{
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caddr_t curp;
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uint32_t *hdr;
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int next;
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if (preload_metadata != NULL) {
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/* Pick up where we left off last time */
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if (base) {
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/* skip to next field */
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curp = base;
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hdr = (uint32_t *)curp;
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next = sizeof(uint32_t) * 2 + hdr[1];
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next = roundup(next, sizeof(u_long));
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curp += next;
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} else
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curp = preload_metadata;
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for (;;) {
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hdr = (uint32_t *)curp;
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if (hdr[0] == 0 && hdr[1] == 0)
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break;
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/* Found a new record? */
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if (hdr[0] == MODINFO_NAME)
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return curp;
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/* skip to next field */
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next = sizeof(uint32_t) * 2 + hdr[1];
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next = roundup(next, sizeof(u_long));
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curp += next;
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}
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}
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return(NULL);
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}
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/*
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* Given a preloaded module handle (mod), return a pointer
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* to the data for the attribute (inf).
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*/
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caddr_t
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preload_search_info(caddr_t mod, int inf)
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{
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caddr_t curp;
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uint32_t *hdr;
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uint32_t type = 0;
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int next;
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curp = mod;
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for (;;) {
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hdr = (uint32_t *)curp;
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/* end of module data? */
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if (hdr[0] == 0 && hdr[1] == 0)
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break;
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/*
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* We give up once we've looped back to what we were looking at
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* first - this should normally be a MODINFO_NAME field.
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*/
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if (type == 0) {
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type = hdr[0];
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} else {
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if (hdr[0] == type)
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break;
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}
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/*
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* Attribute match? Return pointer to data.
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* Consumer may safely assume that size value precedes
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* data.
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*/
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if (hdr[0] == inf)
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return(curp + (sizeof(uint32_t) * 2));
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/* skip to next field */
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next = sizeof(uint32_t) * 2 + hdr[1];
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next = roundup(next, sizeof(u_long));
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curp += next;
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}
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return(NULL);
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}
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/*
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* Delete a preload record by name.
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*/
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void
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preload_delete_name(const char *name)
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{
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caddr_t curp;
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uint32_t *hdr;
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int next;
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int clearing;
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if (preload_metadata != NULL) {
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clearing = 0;
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curp = preload_metadata;
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for (;;) {
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hdr = (uint32_t *)curp;
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if (hdr[0] == 0 && hdr[1] == 0)
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break;
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/* Search for a MODINFO_NAME field */
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if (hdr[0] == MODINFO_NAME) {
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if (!strcmp(name, curp + sizeof(uint32_t) * 2))
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clearing = 1; /* got it, start clearing */
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else if (clearing)
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clearing = 0; /* at next one now.. better stop */
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}
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if (clearing)
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hdr[0] = MODINFO_EMPTY;
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/* skip to next field */
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next = sizeof(uint32_t) * 2 + hdr[1];
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next = roundup(next, sizeof(u_long));
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curp += next;
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}
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}
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}
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void *
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preload_fetch_addr(caddr_t mod)
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{
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caddr_t *mdp;
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mdp = (caddr_t *)preload_search_info(mod, MODINFO_ADDR);
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if (mdp == NULL)
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return (NULL);
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return (*mdp + preload_addr_relocate);
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}
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size_t
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preload_fetch_size(caddr_t mod)
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{
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size_t *mdp;
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mdp = (size_t *)preload_search_info(mod, MODINFO_SIZE);
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if (mdp == NULL)
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return (0);
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return (*mdp);
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}
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/* Called from locore on i386. Convert physical pointers to kvm. Sigh. */
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void
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preload_bootstrap_relocate(vm_offset_t offset)
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{
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caddr_t curp;
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uint32_t *hdr;
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vm_offset_t *ptr;
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int next;
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if (preload_metadata != NULL) {
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curp = preload_metadata;
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for (;;) {
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hdr = (uint32_t *)curp;
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if (hdr[0] == 0 && hdr[1] == 0)
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break;
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/* Deal with the ones that we know we have to fix */
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switch (hdr[0]) {
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case MODINFO_ADDR:
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case MODINFO_METADATA|MODINFOMD_SSYM:
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case MODINFO_METADATA|MODINFOMD_ESYM:
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ptr = (vm_offset_t *)(curp + (sizeof(uint32_t) * 2));
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*ptr += offset;
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break;
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}
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/* The rest is beyond us for now */
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/* skip to next field */
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next = sizeof(uint32_t) * 2 + hdr[1];
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next = roundup(next, sizeof(u_long));
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curp += next;
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}
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}
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}
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