git: 288626083b60 - main - kboot: copy EFI's bootinfo.c and adjust
- Go to: [ bottom of page ] [ top of archives ] [ this month ]
Date: Wed, 07 Dec 2022 18:06:25 UTC
The branch main has been updated by imp:
URL: https://cgit.FreeBSD.org/src/commit/?id=288626083b6064a777ecfe1f64af06d658ef804c
commit 288626083b6064a777ecfe1f64af06d658ef804c
Author: Warner Losh <imp@FreeBSD.org>
AuthorDate: 2022-12-06 18:00:08 +0000
Commit: Warner Losh <imp@FreeBSD.org>
CommitDate: 2022-12-07 18:00:54 +0000
kboot: copy EFI's bootinfo.c and adjust
Copy EFI's bootinfo.c and make minor adjustments for kboot's needs. Do
not connect this to the build just yet until other pieces are in place.
Sponsored by: Netflix
---
stand/kboot/bootinfo.c | 467 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 467 insertions(+)
diff --git a/stand/kboot/bootinfo.c b/stand/kboot/bootinfo.c
new file mode 100644
index 000000000000..c71ec125c031
--- /dev/null
+++ b/stand/kboot/bootinfo.c
@@ -0,0 +1,467 @@
+/*-
+ * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
+ * Copyright (c) 2004, 2006 Marcel Moolenaar
+ * Copyright (c) 2014 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stand.h>
+#include <string.h>
+#include <sys/param.h>
+#include <sys/linker.h>
+#include <sys/reboot.h>
+#include <sys/boot.h>
+#include <machine/cpufunc.h>
+#include <machine/elf.h>
+#include <machine/metadata.h>
+#include <machine/psl.h>
+
+#ifdef EFI
+#include <efi.h>
+#include <efilib.h>
+#endif
+
+#include "bootstrap.h"
+#include "modinfo.h"
+
+#if defined(__amd64__)
+#include <machine/specialreg.h>
+#endif
+
+#ifdef EFI
+#include "loader_efi.h"
+#include "gfx_fb.h"
+#endif
+
+#if defined(LOADER_FDT_SUPPORT)
+#include <fdt_platform.h>
+#endif
+
+#ifdef LOADER_GELI_SUPPORT
+#include "geliboot.h"
+#endif
+
+int bi_load(char *args, vm_offset_t *modulep, vm_offset_t *kernendp,
+ bool exit_bs);
+#ifndef EFI
+void bi_loadsmap(struct preloaded_file *kfp);
+#endif
+
+static int
+bi_getboothowto(char *kargs)
+{
+#ifdef EFI
+ const char *sw, *tmp;
+ char *opts;
+ int speed, port;
+ char buf[50];
+#endif
+ char *console;
+ int howto;
+
+ howto = boot_parse_cmdline(kargs);
+ howto |= boot_env_to_howto();
+
+ console = getenv("console");
+ if (console != NULL) {
+ if (strcmp(console, "comconsole") == 0)
+ howto |= RB_SERIAL;
+ if (strcmp(console, "nullconsole") == 0)
+ howto |= RB_MUTE;
+#ifdef EFI
+#if defined(__i386__) || defined(__amd64__)
+ if (strcmp(console, "efi") == 0 &&
+ getenv("efi_8250_uid") != NULL &&
+ getenv("hw.uart.console") == NULL) {
+ /*
+ * If we found a 8250 com port and com speed, we need to
+ * tell the kernel where the serial port is, and how
+ * fast. Ideally, we'd get the port from ACPI, but that
+ * isn't running in the loader. Do the next best thing
+ * by allowing it to be set by a loader.conf variable,
+ * either a EFI specific one, or the compatible
+ * comconsole_port if not. PCI support is needed, but
+ * for that we'd ideally refactor the
+ * libi386/comconsole.c code to have identical behavior.
+ * We only try to set the port for cases where we saw
+ * the Serial(x) node when parsing, otherwise
+ * specialized hardware that has Uart nodes will have a
+ * bogus address set.
+ * But if someone specifically setup hw.uart.console,
+ * don't override that.
+ */
+ speed = -1;
+ port = -1;
+ tmp = getenv("efi_com_speed");
+ if (tmp != NULL)
+ speed = strtol(tmp, NULL, 0);
+ tmp = getenv("efi_com_port");
+ if (tmp == NULL)
+ tmp = getenv("comconsole_port");
+ if (tmp != NULL)
+ port = strtol(tmp, NULL, 0);
+ if (speed != -1 && port != -1) {
+ snprintf(buf, sizeof(buf), "io:%d,br:%d", port,
+ speed);
+ env_setenv("hw.uart.console", EV_VOLATILE, buf,
+ NULL, NULL);
+ }
+ }
+#endif
+#endif
+ }
+
+ return (howto);
+}
+
+#ifdef EFI
+static EFI_STATUS
+efi_do_vmap(EFI_MEMORY_DESCRIPTOR *mm, UINTN sz, UINTN mmsz, UINT32 mmver)
+{
+ EFI_MEMORY_DESCRIPTOR *desc, *viter, *vmap;
+ EFI_STATUS ret;
+ int curr, ndesc, nset;
+
+ nset = 0;
+ desc = mm;
+ ndesc = sz / mmsz;
+ vmap = malloc(sz);
+ if (vmap == NULL)
+ /* This isn't really an EFI error case, but pretend it is */
+ return (EFI_OUT_OF_RESOURCES);
+ viter = vmap;
+ for (curr = 0; curr < ndesc;
+ curr++, desc = NextMemoryDescriptor(desc, mmsz)) {
+ if ((desc->Attribute & EFI_MEMORY_RUNTIME) != 0) {
+ ++nset;
+ desc->VirtualStart = desc->PhysicalStart;
+ *viter = *desc;
+ viter = NextMemoryDescriptor(viter, mmsz);
+ }
+ }
+ ret = RS->SetVirtualAddressMap(nset * mmsz, mmsz, mmver, vmap);
+ free(vmap);
+ return (ret);
+}
+
+static int
+bi_load_efi_data(struct preloaded_file *kfp, bool exit_bs)
+{
+ EFI_MEMORY_DESCRIPTOR *mm;
+ EFI_PHYSICAL_ADDRESS addr = 0;
+ EFI_STATUS status;
+ const char *efi_novmap;
+ size_t efisz;
+ UINTN efi_mapkey;
+ UINTN dsz, pages, retry, sz;
+ UINT32 mmver;
+ struct efi_map_header *efihdr;
+ bool do_vmap;
+
+#if defined(__amd64__) || defined(__aarch64__)
+ struct efi_fb efifb;
+
+ efifb.fb_addr = gfx_state.tg_fb.fb_addr;
+ efifb.fb_size = gfx_state.tg_fb.fb_size;
+ efifb.fb_height = gfx_state.tg_fb.fb_height;
+ efifb.fb_width = gfx_state.tg_fb.fb_width;
+ efifb.fb_stride = gfx_state.tg_fb.fb_stride;
+ efifb.fb_mask_red = gfx_state.tg_fb.fb_mask_red;
+ efifb.fb_mask_green = gfx_state.tg_fb.fb_mask_green;
+ efifb.fb_mask_blue = gfx_state.tg_fb.fb_mask_blue;
+ efifb.fb_mask_reserved = gfx_state.tg_fb.fb_mask_reserved;
+
+ printf("EFI framebuffer information:\n");
+ printf("addr, size 0x%jx, 0x%jx\n", efifb.fb_addr, efifb.fb_size);
+ printf("dimensions %d x %d\n", efifb.fb_width, efifb.fb_height);
+ printf("stride %d\n", efifb.fb_stride);
+ printf("masks 0x%08x, 0x%08x, 0x%08x, 0x%08x\n",
+ efifb.fb_mask_red, efifb.fb_mask_green, efifb.fb_mask_blue,
+ efifb.fb_mask_reserved);
+
+ if (efifb.fb_addr != 0)
+ file_addmetadata(kfp, MODINFOMD_EFI_FB, sizeof(efifb), &efifb);
+#endif
+
+ do_vmap = true;
+ efi_novmap = getenv("efi_disable_vmap");
+ if (efi_novmap != NULL)
+ do_vmap = strcasecmp(efi_novmap, "YES") != 0;
+
+ efisz = (sizeof(struct efi_map_header) + 0xf) & ~0xf;
+
+ /*
+ * Assign size of EFI_MEMORY_DESCRIPTOR to keep compatible with
+ * u-boot which doesn't fill this value when buffer for memory
+ * descriptors is too small (eg. 0 to obtain memory map size)
+ */
+ dsz = sizeof(EFI_MEMORY_DESCRIPTOR);
+
+ /*
+ * Allocate enough pages to hold the bootinfo block and the
+ * memory map EFI will return to us. The memory map has an
+ * unknown size, so we have to determine that first. Note that
+ * the AllocatePages call can itself modify the memory map, so
+ * we have to take that into account as well. The changes to
+ * the memory map are caused by splitting a range of free
+ * memory into two, so that one is marked as being loader
+ * data.
+ */
+
+ sz = 0;
+ mm = NULL;
+
+ /*
+ * Matthew Garrett has observed at least one system changing the
+ * memory map when calling ExitBootServices, causing it to return an
+ * error, probably because callbacks are allocating memory.
+ * So we need to retry calling it at least once.
+ */
+ for (retry = 2; retry > 0; retry--) {
+ for (;;) {
+ status = BS->GetMemoryMap(&sz, mm, &efi_mapkey, &dsz, &mmver);
+ if (!EFI_ERROR(status))
+ break;
+
+ if (status != EFI_BUFFER_TOO_SMALL) {
+ printf("%s: GetMemoryMap error %lu\n", __func__,
+ EFI_ERROR_CODE(status));
+ return (EINVAL);
+ }
+
+ if (addr != 0)
+ BS->FreePages(addr, pages);
+
+ /* Add 10 descriptors to the size to allow for
+ * fragmentation caused by calling AllocatePages */
+ sz += (10 * dsz);
+ pages = EFI_SIZE_TO_PAGES(sz + efisz);
+ status = BS->AllocatePages(AllocateAnyPages, EfiLoaderData,
+ pages, &addr);
+ if (EFI_ERROR(status)) {
+ printf("%s: AllocatePages error %lu\n", __func__,
+ EFI_ERROR_CODE(status));
+ return (ENOMEM);
+ }
+
+ /*
+ * Read the memory map and stash it after bootinfo. Align the
+ * memory map on a 16-byte boundary (the bootinfo block is page
+ * aligned).
+ */
+ efihdr = (struct efi_map_header *)(uintptr_t)addr;
+ mm = (void *)((uint8_t *)efihdr + efisz);
+ sz = (EFI_PAGE_SIZE * pages) - efisz;
+ }
+
+ if (!exit_bs)
+ break;
+ status = efi_exit_boot_services(efi_mapkey);
+ if (!EFI_ERROR(status))
+ break;
+ }
+
+ if (retry == 0) {
+ BS->FreePages(addr, pages);
+ printf("ExitBootServices error %lu\n", EFI_ERROR_CODE(status));
+ return (EINVAL);
+ }
+
+ /*
+ * This may be disabled by setting efi_disable_vmap in
+ * loader.conf(5). By default we will setup the virtual
+ * map entries.
+ */
+
+ if (do_vmap)
+ efi_do_vmap(mm, sz, dsz, mmver);
+ efihdr->memory_size = sz;
+ efihdr->descriptor_size = dsz;
+ efihdr->descriptor_version = mmver;
+ file_addmetadata(kfp, MODINFOMD_EFI_MAP, efisz + sz,
+ efihdr);
+
+ return (0);
+}
+#endif
+
+/*
+ * Load the information expected by an amd64 kernel.
+ *
+ * - The 'boothowto' argument is constructed.
+ * - The 'bootdev' argument is constructed.
+ * - The 'bootinfo' struct is constructed, and copied into the kernel space.
+ * - The kernel environment is copied into kernel space.
+ * - Module metadata are formatted and placed in kernel space.
+ */
+int
+bi_load(char *args, vm_offset_t *modulep, vm_offset_t *kernendp, bool exit_bs)
+{
+ struct preloaded_file *xp, *kfp;
+ struct devdesc *rootdev;
+ struct file_metadata *md;
+ vm_offset_t addr;
+ uint64_t kernend, module;
+ uint64_t envp;
+ vm_offset_t size;
+ char *rootdevname;
+ int howto;
+ bool is64 = sizeof(long) == 8;
+#if defined(LOADER_FDT_SUPPORT)
+ vm_offset_t dtbp;
+ int dtb_size;
+#endif
+#if defined(__arm__)
+ vm_offset_t vaddr;
+ size_t i;
+ /*
+ * These metadata addreses must be converted for kernel after
+ * relocation.
+ */
+ uint32_t mdt[] = {
+ MODINFOMD_SSYM, MODINFOMD_ESYM, MODINFOMD_KERNEND,
+ MODINFOMD_ENVP, MODINFOMD_FONT,
+#if defined(LOADER_FDT_SUPPORT)
+ MODINFOMD_DTBP
+#endif
+ };
+#endif
+
+ howto = bi_getboothowto(args);
+
+ /*
+ * Allow the environment variable 'rootdev' to override the supplied
+ * device. This should perhaps go to MI code and/or have $rootdev
+ * tested/set by MI code before launching the kernel.
+ */
+ rootdevname = getenv("rootdev");
+ archsw.arch_getdev((void**)(&rootdev), rootdevname, NULL);
+ if (rootdev == NULL) {
+ printf("Can't determine root device.\n");
+ return(EINVAL);
+ }
+
+#ifdef EFI
+ /* Try reading the /etc/fstab file to select the root device */
+ getrootmount(devformat(rootdev));
+#endif
+
+ 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 = md_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);
+#ifdef MODINFOMD_MODULEP
+ file_addmetadata(kfp, MODINFOMD_MODULEP, sizeof(module), &module);
+#endif
+#ifdef EFI
+ file_addmetadata(kfp, MODINFOMD_FW_HANDLE, sizeof(ST), &ST);
+#endif
+#ifdef LOADER_GELI_SUPPORT
+ geli_export_key_metadata(kfp);
+#endif
+#ifdef EFI
+ bi_load_efi_data(kfp, exit_bs);
+#else
+ bi_loadsmap(kfp);
+#endif
+
+ size = md_copymodules(0, is64); /* Find the size of the modules */
+ 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)md_copymodules(addr, is64);
+
+ return (0);
+}