7d3259775c
This mirrors the functionality of the BIOS amd64 bi_load function, that stashes the absolute address of the module metadata. This is required for booting as a Xen dom0 that does relocate the modulep and the loaded modules, and thus requires adjusting the offset. No functional change introduced, further patches will make use of this functionality for Xen dom0 loading. Sponsored by: Citrix Systems R&D Reviewed by: imp Differential revision: https://reviews.freebsd.org/D28496
571 lines
16 KiB
C
571 lines
16 KiB
C
/*-
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* Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
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* Copyright (c) 2004, 2006 Marcel Moolenaar
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* Copyright (c) 2014 The FreeBSD Foundation
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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 <stand.h>
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#include <string.h>
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#include <sys/param.h>
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#include <sys/linker.h>
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#include <sys/reboot.h>
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#include <sys/boot.h>
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#include <machine/cpufunc.h>
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#include <machine/elf.h>
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#include <machine/metadata.h>
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#include <machine/psl.h>
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#include <efi.h>
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#include <efilib.h>
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#include "bootstrap.h"
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#include "loader_efi.h"
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#if defined(__amd64__)
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#include <machine/specialreg.h>
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#endif
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#include "gfx_fb.h"
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#if defined(LOADER_FDT_SUPPORT)
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#include <fdt_platform.h>
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#endif
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#ifdef LOADER_GELI_SUPPORT
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#include "geliboot.h"
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#endif
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int bi_load(char *args, vm_offset_t *modulep, vm_offset_t *kernendp,
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bool exit_bs);
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extern EFI_SYSTEM_TABLE *ST;
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static int
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bi_getboothowto(char *kargs)
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{
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const char *sw, *tmp;
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char *opts;
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char *console;
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int howto, speed, port;
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char buf[50];
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howto = boot_parse_cmdline(kargs);
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howto |= boot_env_to_howto();
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console = getenv("console");
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if (console != NULL) {
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if (strcmp(console, "comconsole") == 0)
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howto |= RB_SERIAL;
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if (strcmp(console, "nullconsole") == 0)
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howto |= RB_MUTE;
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#if defined(__i386__) || defined(__amd64__)
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if (strcmp(console, "efi") == 0 &&
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getenv("efi_8250_uid") != NULL &&
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getenv("hw.uart.console") == NULL) {
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/*
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* If we found a 8250 com port and com speed, we need to
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* tell the kernel where the serial port is, and how
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* fast. Ideally, we'd get the port from ACPI, but that
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* isn't running in the loader. Do the next best thing
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* by allowing it to be set by a loader.conf variable,
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* either a EFI specific one, or the compatible
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* comconsole_port if not. PCI support is needed, but
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* for that we'd ideally refactor the
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* libi386/comconsole.c code to have identical behavior.
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* We only try to set the port for cases where we saw
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* the Serial(x) node when parsing, otherwise
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* specialized hardware that has Uart nodes will have a
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* bogus address set.
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* But if someone specifically setup hw.uart.console,
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* don't override that.
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*/
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speed = -1;
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port = -1;
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tmp = getenv("efi_com_speed");
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if (tmp != NULL)
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speed = strtol(tmp, NULL, 0);
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tmp = getenv("efi_com_port");
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if (tmp == NULL)
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tmp = getenv("comconsole_port");
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if (tmp != NULL)
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port = strtol(tmp, NULL, 0);
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if (speed != -1 && port != -1) {
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snprintf(buf, sizeof(buf), "io:%d,br:%d", port,
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speed);
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env_setenv("hw.uart.console", EV_VOLATILE, buf,
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NULL, NULL);
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}
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}
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#endif
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}
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return (howto);
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}
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/*
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* Copy the environment into the load area starting at (addr).
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* Each variable is formatted as <name>=<value>, with a single nul
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* separating each variable, and a double nul terminating the environment.
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*/
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static vm_offset_t
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bi_copyenv(vm_offset_t start)
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{
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struct env_var *ep;
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vm_offset_t addr, last;
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size_t len;
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addr = last = start;
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/* Traverse the environment. */
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for (ep = environ; ep != NULL; ep = ep->ev_next) {
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len = strlen(ep->ev_name);
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if ((size_t)archsw.arch_copyin(ep->ev_name, addr, len) != len)
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break;
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addr += len;
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if (archsw.arch_copyin("=", addr, 1) != 1)
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break;
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addr++;
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if (ep->ev_value != NULL) {
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len = strlen(ep->ev_value);
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if ((size_t)archsw.arch_copyin(ep->ev_value, addr, len) != len)
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break;
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addr += len;
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}
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if (archsw.arch_copyin("", addr, 1) != 1)
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break;
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last = ++addr;
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}
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if (archsw.arch_copyin("", last++, 1) != 1)
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last = start;
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return(last);
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}
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/*
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* Copy module-related data into the load area, where it can be
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* used as a directory for loaded modules.
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*
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* Module data is presented in a self-describing format. Each datum
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* is preceded by a 32-bit identifier and a 32-bit size field.
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*
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* Currently, the following data are saved:
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*
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* MOD_NAME (variable) module name (string)
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* MOD_TYPE (variable) module type (string)
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* MOD_ARGS (variable) module parameters (string)
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* MOD_ADDR sizeof(vm_offset_t) module load address
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* MOD_SIZE sizeof(size_t) module size
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* MOD_METADATA (variable) type-specific metadata
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*/
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#define COPY32(v, a, c) { \
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uint32_t x = (v); \
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if (c) \
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archsw.arch_copyin(&x, a, sizeof(x)); \
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a += sizeof(x); \
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}
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#define MOD_STR(t, a, s, c) { \
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COPY32(t, a, c); \
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COPY32(strlen(s) + 1, a, c); \
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if (c) \
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archsw.arch_copyin(s, a, strlen(s) + 1); \
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a += roundup(strlen(s) + 1, sizeof(u_long)); \
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}
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#define MOD_NAME(a, s, c) MOD_STR(MODINFO_NAME, a, s, c)
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#define MOD_TYPE(a, s, c) MOD_STR(MODINFO_TYPE, a, s, c)
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#define MOD_ARGS(a, s, c) MOD_STR(MODINFO_ARGS, a, s, c)
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#define MOD_VAR(t, a, s, c) { \
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COPY32(t, a, c); \
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COPY32(sizeof(s), a, c); \
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if (c) \
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archsw.arch_copyin(&s, a, sizeof(s)); \
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a += roundup(sizeof(s), sizeof(u_long)); \
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}
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#define MOD_ADDR(a, s, c) MOD_VAR(MODINFO_ADDR, a, s, c)
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#define MOD_SIZE(a, s, c) MOD_VAR(MODINFO_SIZE, a, s, c)
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#define MOD_METADATA(a, mm, c) { \
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COPY32(MODINFO_METADATA | mm->md_type, a, c); \
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COPY32(mm->md_size, a, c); \
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if (c) \
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archsw.arch_copyin(mm->md_data, a, mm->md_size); \
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a += roundup(mm->md_size, sizeof(u_long)); \
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}
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#define MOD_END(a, c) { \
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COPY32(MODINFO_END, a, c); \
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COPY32(0, a, c); \
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}
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static vm_offset_t
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bi_copymodules(vm_offset_t addr)
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{
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struct preloaded_file *fp;
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struct file_metadata *md;
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int c;
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uint64_t v;
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c = addr != 0;
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/* Start with the first module on the list, should be the kernel. */
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for (fp = file_findfile(NULL, NULL); fp != NULL; fp = fp->f_next) {
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MOD_NAME(addr, fp->f_name, c); /* This must come first. */
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MOD_TYPE(addr, fp->f_type, c);
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if (fp->f_args)
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MOD_ARGS(addr, fp->f_args, c);
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v = fp->f_addr;
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#if defined(__arm__)
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v -= __elfN(relocation_offset);
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#endif
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MOD_ADDR(addr, v, c);
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v = fp->f_size;
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MOD_SIZE(addr, v, c);
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for (md = fp->f_metadata; md != NULL; md = md->md_next)
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if (!(md->md_type & MODINFOMD_NOCOPY))
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MOD_METADATA(addr, md, c);
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}
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MOD_END(addr, c);
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return(addr);
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}
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static EFI_STATUS
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efi_do_vmap(EFI_MEMORY_DESCRIPTOR *mm, UINTN sz, UINTN mmsz, UINT32 mmver)
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{
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EFI_MEMORY_DESCRIPTOR *desc, *viter, *vmap;
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EFI_STATUS ret;
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int curr, ndesc, nset;
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nset = 0;
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desc = mm;
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ndesc = sz / mmsz;
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vmap = malloc(sz);
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if (vmap == NULL)
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/* This isn't really an EFI error case, but pretend it is */
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return (EFI_OUT_OF_RESOURCES);
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viter = vmap;
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for (curr = 0; curr < ndesc;
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curr++, desc = NextMemoryDescriptor(desc, mmsz)) {
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if ((desc->Attribute & EFI_MEMORY_RUNTIME) != 0) {
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++nset;
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desc->VirtualStart = desc->PhysicalStart;
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*viter = *desc;
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viter = NextMemoryDescriptor(viter, mmsz);
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}
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}
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ret = RS->SetVirtualAddressMap(nset * mmsz, mmsz, mmver, vmap);
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free(vmap);
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return (ret);
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}
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static int
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bi_load_efi_data(struct preloaded_file *kfp, bool exit_bs)
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{
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EFI_MEMORY_DESCRIPTOR *mm;
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EFI_PHYSICAL_ADDRESS addr = 0;
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EFI_STATUS status;
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const char *efi_novmap;
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size_t efisz;
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UINTN efi_mapkey;
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UINTN dsz, pages, retry, sz;
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UINT32 mmver;
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struct efi_map_header *efihdr;
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bool do_vmap;
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#if defined(__amd64__) || defined(__aarch64__)
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struct efi_fb efifb;
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efifb.fb_addr = gfx_state.tg_fb.fb_addr;
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efifb.fb_size = gfx_state.tg_fb.fb_size;
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efifb.fb_height = gfx_state.tg_fb.fb_height;
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efifb.fb_width = gfx_state.tg_fb.fb_width;
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efifb.fb_stride = gfx_state.tg_fb.fb_stride;
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efifb.fb_mask_red = gfx_state.tg_fb.fb_mask_red;
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efifb.fb_mask_green = gfx_state.tg_fb.fb_mask_green;
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efifb.fb_mask_blue = gfx_state.tg_fb.fb_mask_blue;
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efifb.fb_mask_reserved = gfx_state.tg_fb.fb_mask_reserved;
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printf("EFI framebuffer information:\n");
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printf("addr, size 0x%jx, 0x%jx\n", efifb.fb_addr, efifb.fb_size);
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printf("dimensions %d x %d\n", efifb.fb_width, efifb.fb_height);
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printf("stride %d\n", efifb.fb_stride);
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printf("masks 0x%08x, 0x%08x, 0x%08x, 0x%08x\n",
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efifb.fb_mask_red, efifb.fb_mask_green, efifb.fb_mask_blue,
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efifb.fb_mask_reserved);
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if (efifb.fb_addr != 0)
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file_addmetadata(kfp, MODINFOMD_EFI_FB, sizeof(efifb), &efifb);
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#endif
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do_vmap = true;
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efi_novmap = getenv("efi_disable_vmap");
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if (efi_novmap != NULL)
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do_vmap = strcasecmp(efi_novmap, "YES") != 0;
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efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf;
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/*
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* Assign size of EFI_MEMORY_DESCRIPTOR to keep compatible with
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* u-boot which doesn't fill this value when buffer for memory
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* descriptors is too small (eg. 0 to obtain memory map size)
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*/
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dsz = sizeof(EFI_MEMORY_DESCRIPTOR);
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/*
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* Allocate enough pages to hold the bootinfo block and the
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* memory map EFI will return to us. The memory map has an
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* unknown size, so we have to determine that first. Note that
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* the AllocatePages call can itself modify the memory map, so
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* we have to take that into account as well. The changes to
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* the memory map are caused by splitting a range of free
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* memory into two, so that one is marked as being loader
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* data.
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*/
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sz = 0;
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/*
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* Matthew Garrett has observed at least one system changing the
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* memory map when calling ExitBootServices, causing it to return an
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* error, probably because callbacks are allocating memory.
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* So we need to retry calling it at least once.
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*/
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for (retry = 2; retry > 0; retry--) {
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for (;;) {
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status = BS->GetMemoryMap(&sz, mm, &efi_mapkey, &dsz, &mmver);
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if (!EFI_ERROR(status))
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break;
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if (status != EFI_BUFFER_TOO_SMALL) {
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printf("%s: GetMemoryMap error %lu\n", __func__,
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EFI_ERROR_CODE(status));
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return (EINVAL);
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}
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if (addr != 0)
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BS->FreePages(addr, pages);
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/* Add 10 descriptors to the size to allow for
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* fragmentation caused by calling AllocatePages */
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sz += (10 * dsz);
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pages = EFI_SIZE_TO_PAGES(sz + efisz);
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status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData,
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pages, &addr);
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if (EFI_ERROR(status)) {
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printf("%s: AllocatePages error %lu\n", __func__,
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EFI_ERROR_CODE(status));
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return (ENOMEM);
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}
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/*
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* Read the memory map and stash it after bootinfo. Align the
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* memory map on a 16-byte boundary (the bootinfo block is page
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* aligned).
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*/
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efihdr = (struct efi_map_header *)(uintptr_t)addr;
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mm = (void *)((uint8_t *)efihdr + efisz);
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sz = (EFI_PAGE_SIZE * pages) - efisz;
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}
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if (!exit_bs)
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break;
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status = BS->ExitBootServices(IH, efi_mapkey);
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if (!EFI_ERROR(status))
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break;
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}
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if (retry == 0) {
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BS->FreePages(addr, pages);
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printf("ExitBootServices error %lu\n", EFI_ERROR_CODE(status));
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return (EINVAL);
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}
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/*
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* This may be disabled by setting efi_disable_vmap in
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* loader.conf(5). By default we will setup the virtual
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* map entries.
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*/
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if (do_vmap)
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efi_do_vmap(mm, sz, dsz, mmver);
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efihdr->memory_size = sz;
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efihdr->descriptor_size = dsz;
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efihdr->descriptor_version = mmver;
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file_addmetadata(kfp, MODINFOMD_EFI_MAP, efisz + sz,
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efihdr);
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return (0);
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}
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/*
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* Load the information expected by an amd64 kernel.
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*
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* - The 'boothowto' argument is constructed.
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* - The 'bootdev' argument is constructed.
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* - The 'bootinfo' struct is constructed, and copied into the kernel space.
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* - The kernel environment is copied into kernel space.
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* - Module metadata are formatted and placed in kernel space.
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*/
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int
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bi_load(char *args, vm_offset_t *modulep, vm_offset_t *kernendp, bool exit_bs)
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{
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struct preloaded_file *xp, *kfp;
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struct devdesc *rootdev;
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struct file_metadata *md;
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vm_offset_t addr;
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uint64_t kernend, module;
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uint64_t envp;
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vm_offset_t size;
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char *rootdevname;
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int howto;
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#if defined(LOADER_FDT_SUPPORT)
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vm_offset_t dtbp;
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int dtb_size;
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#endif
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#if defined(__arm__)
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vm_offset_t vaddr;
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size_t i;
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/*
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* These metadata addreses must be converted for kernel after
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* relocation.
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*/
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uint32_t mdt[] = {
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MODINFOMD_SSYM, MODINFOMD_ESYM, MODINFOMD_KERNEND,
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MODINFOMD_ENVP, MODINFOMD_FONT,
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#if defined(LOADER_FDT_SUPPORT)
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MODINFOMD_DTBP
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#endif
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};
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#endif
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howto = bi_getboothowto(args);
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/*
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* Allow the environment variable 'rootdev' to override the supplied
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* device. This should perhaps go to MI code and/or have $rootdev
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* tested/set by MI code before launching the kernel.
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*/
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rootdevname = getenv("rootdev");
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archsw.arch_getdev((void**)(&rootdev), rootdevname, NULL);
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if (rootdev == NULL) {
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printf("Can't determine root device.\n");
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return(EINVAL);
|
|
}
|
|
|
|
/* Try reading the /etc/fstab file to select the root device */
|
|
getrootmount(efi_fmtdev((void *)rootdev));
|
|
|
|
addr = 0;
|
|
for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
|
|
if (addr < (xp->f_addr + xp->f_size))
|
|
addr = xp->f_addr + xp->f_size;
|
|
}
|
|
|
|
/* Pad to a page boundary. */
|
|
addr = roundup(addr, PAGE_SIZE);
|
|
|
|
addr = build_font_module(addr);
|
|
|
|
/* Pad to a page boundary. */
|
|
addr = roundup(addr, PAGE_SIZE);
|
|
|
|
/* Copy our environment. */
|
|
envp = addr;
|
|
addr = bi_copyenv(addr);
|
|
|
|
/* Pad to a page boundary. */
|
|
addr = roundup(addr, PAGE_SIZE);
|
|
|
|
#if defined(LOADER_FDT_SUPPORT)
|
|
/* Handle device tree blob */
|
|
dtbp = addr;
|
|
dtb_size = fdt_copy(addr);
|
|
|
|
/* Pad to a page boundary */
|
|
if (dtb_size)
|
|
addr += roundup(dtb_size, PAGE_SIZE);
|
|
#endif
|
|
|
|
kfp = file_findfile(NULL, "elf kernel");
|
|
if (kfp == NULL)
|
|
kfp = file_findfile(NULL, "elf64 kernel");
|
|
if (kfp == NULL)
|
|
panic("can't find kernel file");
|
|
kernend = 0; /* fill it in later */
|
|
|
|
/* Figure out the size and location of the metadata. */
|
|
module = *modulep = addr;
|
|
|
|
file_addmetadata(kfp, MODINFOMD_HOWTO, sizeof(howto), &howto);
|
|
file_addmetadata(kfp, MODINFOMD_ENVP, sizeof(envp), &envp);
|
|
#if defined(LOADER_FDT_SUPPORT)
|
|
if (dtb_size)
|
|
file_addmetadata(kfp, MODINFOMD_DTBP, sizeof(dtbp), &dtbp);
|
|
else
|
|
printf("WARNING! Trying to fire up the kernel, but no "
|
|
"device tree blob found!\n");
|
|
#endif
|
|
file_addmetadata(kfp, MODINFOMD_KERNEND, sizeof(kernend), &kernend);
|
|
file_addmetadata(kfp, MODINFOMD_MODULEP, sizeof(module), &module);
|
|
file_addmetadata(kfp, MODINFOMD_FW_HANDLE, sizeof(ST), &ST);
|
|
#ifdef LOADER_GELI_SUPPORT
|
|
geli_export_key_metadata(kfp);
|
|
#endif
|
|
bi_load_efi_data(kfp, exit_bs);
|
|
|
|
size = bi_copymodules(0);
|
|
kernend = roundup(addr + size, PAGE_SIZE);
|
|
*kernendp = kernend;
|
|
|
|
/* patch MODINFOMD_KERNEND */
|
|
md = file_findmetadata(kfp, MODINFOMD_KERNEND);
|
|
bcopy(&kernend, md->md_data, sizeof kernend);
|
|
|
|
#if defined(__arm__)
|
|
*modulep -= __elfN(relocation_offset);
|
|
|
|
/* Do relocation fixup on metadata of each module. */
|
|
for (xp = file_findfile(NULL, NULL); xp != NULL; xp = xp->f_next) {
|
|
for (i = 0; i < nitems(mdt); i++) {
|
|
md = file_findmetadata(xp, mdt[i]);
|
|
if (md) {
|
|
bcopy(md->md_data, &vaddr, sizeof vaddr);
|
|
vaddr -= __elfN(relocation_offset);
|
|
bcopy(&vaddr, md->md_data, sizeof vaddr);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Copy module list and metadata. */
|
|
(void)bi_copymodules(addr);
|
|
|
|
return (0);
|
|
}
|