u-boot/cmd/pxe_utils.c
Dimitri John Ledkov 75efe7dc99 cmd: pxe_utils: sysboot: fix crash if either board or soc are not set.
If the environment does not have "soc" or "board" set, and fdtdir
option is specified in extlinux.conf, the bootloader will crash whilst
dereferencing a null pointer. Add a guard against null soc or
board. Fixes a crash of qemu-riscv64_smode configuration, which does
not have CONFIG_SYS_SOC defined.

Signed-off-by: Dimitri John Ledkov <xnox@ubuntu.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
2021-06-18 11:29:17 +03:00

1479 lines
32 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2010-2011 Calxeda, Inc.
* Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
*/
#include <common.h>
#include <command.h>
#include <env.h>
#include <image.h>
#include <log.h>
#include <malloc.h>
#include <mapmem.h>
#include <lcd.h>
#include <net.h>
#include <fdt_support.h>
#include <linux/libfdt.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <errno.h>
#include <linux/list.h>
#include <splash.h>
#include <asm/io.h>
#include "menu.h"
#include "cli.h"
#include "pxe_utils.h"
#define MAX_TFTP_PATH_LEN 512
bool is_pxe;
/*
* Convert an ethaddr from the environment to the format used by pxelinux
* filenames based on mac addresses. Convert's ':' to '-', and adds "01-" to
* the beginning of the ethernet address to indicate a hardware type of
* Ethernet. Also converts uppercase hex characters into lowercase, to match
* pxelinux's behavior.
*
* Returns 1 for success, -ENOENT if 'ethaddr' is undefined in the
* environment, or some other value < 0 on error.
*/
int format_mac_pxe(char *outbuf, size_t outbuf_len)
{
uchar ethaddr[6];
if (outbuf_len < 21) {
printf("outbuf is too small (%zd < 21)\n", outbuf_len);
return -EINVAL;
}
if (!eth_env_get_enetaddr_by_index("eth", eth_get_dev_index(), ethaddr))
return -ENOENT;
sprintf(outbuf, "01-%02x-%02x-%02x-%02x-%02x-%02x",
ethaddr[0], ethaddr[1], ethaddr[2],
ethaddr[3], ethaddr[4], ethaddr[5]);
return 1;
}
/*
* Returns the directory the file specified in the bootfile env variable is
* in. If bootfile isn't defined in the environment, return NULL, which should
* be interpreted as "don't prepend anything to paths".
*/
static int get_bootfile_path(const char *file_path, char *bootfile_path,
size_t bootfile_path_size)
{
char *bootfile, *last_slash;
size_t path_len = 0;
/* Only syslinux allows absolute paths */
if (file_path[0] == '/' && !is_pxe)
goto ret;
bootfile = from_env("bootfile");
if (!bootfile)
goto ret;
last_slash = strrchr(bootfile, '/');
if (!last_slash)
goto ret;
path_len = (last_slash - bootfile) + 1;
if (bootfile_path_size < path_len) {
printf("bootfile_path too small. (%zd < %zd)\n",
bootfile_path_size, path_len);
return -1;
}
strncpy(bootfile_path, bootfile, path_len);
ret:
bootfile_path[path_len] = '\0';
return 1;
}
int (*do_getfile)(struct cmd_tbl *cmdtp, const char *file_path,
char *file_addr);
/*
* As in pxelinux, paths to files referenced from files we retrieve are
* relative to the location of bootfile. get_relfile takes such a path and
* joins it with the bootfile path to get the full path to the target file. If
* the bootfile path is NULL, we use file_path as is.
*
* Returns 1 for success, or < 0 on error.
*/
static int get_relfile(struct cmd_tbl *cmdtp, const char *file_path,
unsigned long file_addr)
{
size_t path_len;
char relfile[MAX_TFTP_PATH_LEN + 1];
char addr_buf[18];
int err;
err = get_bootfile_path(file_path, relfile, sizeof(relfile));
if (err < 0)
return err;
path_len = strlen(file_path);
path_len += strlen(relfile);
if (path_len > MAX_TFTP_PATH_LEN) {
printf("Base path too long (%s%s)\n", relfile, file_path);
return -ENAMETOOLONG;
}
strcat(relfile, file_path);
printf("Retrieving file: %s\n", relfile);
sprintf(addr_buf, "%lx", file_addr);
return do_getfile(cmdtp, relfile, addr_buf);
}
/*
* Retrieve the file at 'file_path' to the locate given by 'file_addr'. If
* 'bootfile' was specified in the environment, the path to bootfile will be
* prepended to 'file_path' and the resulting path will be used.
*
* Returns 1 on success, or < 0 for error.
*/
int get_pxe_file(struct cmd_tbl *cmdtp, const char *file_path,
unsigned long file_addr)
{
unsigned long config_file_size;
char *tftp_filesize;
int err;
char *buf;
err = get_relfile(cmdtp, file_path, file_addr);
if (err < 0)
return err;
/*
* the file comes without a NUL byte at the end, so find out its size
* and add the NUL byte.
*/
tftp_filesize = from_env("filesize");
if (!tftp_filesize)
return -ENOENT;
if (strict_strtoul(tftp_filesize, 16, &config_file_size) < 0)
return -EINVAL;
buf = map_sysmem(file_addr + config_file_size, 1);
*buf = '\0';
unmap_sysmem(buf);
return 1;
}
#define PXELINUX_DIR "pxelinux.cfg/"
/*
* Retrieves a file in the 'pxelinux.cfg' folder. Since this uses get_pxe_file
* to do the hard work, the location of the 'pxelinux.cfg' folder is generated
* from the bootfile path, as described above.
*
* Returns 1 on success or < 0 on error.
*/
int get_pxelinux_path(struct cmd_tbl *cmdtp, const char *file,
unsigned long pxefile_addr_r)
{
size_t base_len = strlen(PXELINUX_DIR);
char path[MAX_TFTP_PATH_LEN + 1];
if (base_len + strlen(file) > MAX_TFTP_PATH_LEN) {
printf("path (%s%s) too long, skipping\n",
PXELINUX_DIR, file);
return -ENAMETOOLONG;
}
sprintf(path, PXELINUX_DIR "%s", file);
return get_pxe_file(cmdtp, path, pxefile_addr_r);
}
/*
* Wrapper to make it easier to store the file at file_path in the location
* specified by envaddr_name. file_path will be joined to the bootfile path,
* if any is specified.
*
* Returns 1 on success or < 0 on error.
*/
static int get_relfile_envaddr(struct cmd_tbl *cmdtp, const char *file_path,
const char *envaddr_name)
{
unsigned long file_addr;
char *envaddr;
envaddr = from_env(envaddr_name);
if (!envaddr)
return -ENOENT;
if (strict_strtoul(envaddr, 16, &file_addr) < 0)
return -EINVAL;
return get_relfile(cmdtp, file_path, file_addr);
}
/*
* Allocates memory for and initializes a pxe_label. This uses malloc, so the
* result must be free()'d to reclaim the memory.
*
* Returns NULL if malloc fails.
*/
static struct pxe_label *label_create(void)
{
struct pxe_label *label;
label = malloc(sizeof(struct pxe_label));
if (!label)
return NULL;
memset(label, 0, sizeof(struct pxe_label));
return label;
}
/*
* Free the memory used by a pxe_label, including that used by its name,
* kernel, append and initrd members, if they're non NULL.
*
* So - be sure to only use dynamically allocated memory for the members of
* the pxe_label struct, unless you want to clean it up first. These are
* currently only created by the pxe file parsing code.
*/
static void label_destroy(struct pxe_label *label)
{
if (label->name)
free(label->name);
if (label->kernel)
free(label->kernel);
if (label->config)
free(label->config);
if (label->append)
free(label->append);
if (label->initrd)
free(label->initrd);
if (label->fdt)
free(label->fdt);
if (label->fdtdir)
free(label->fdtdir);
if (label->fdtoverlays)
free(label->fdtoverlays);
free(label);
}
/*
* Print a label and its string members if they're defined.
*
* This is passed as a callback to the menu code for displaying each
* menu entry.
*/
static void label_print(void *data)
{
struct pxe_label *label = data;
const char *c = label->menu ? label->menu : label->name;
printf("%s:\t%s\n", label->num, c);
}
/*
* Boot a label that specified 'localboot'. This requires that the 'localcmd'
* environment variable is defined. Its contents will be executed as U-Boot
* command. If the label specified an 'append' line, its contents will be
* used to overwrite the contents of the 'bootargs' environment variable prior
* to running 'localcmd'.
*
* Returns 1 on success or < 0 on error.
*/
static int label_localboot(struct pxe_label *label)
{
char *localcmd;
localcmd = from_env("localcmd");
if (!localcmd)
return -ENOENT;
if (label->append) {
char bootargs[CONFIG_SYS_CBSIZE];
cli_simple_process_macros(label->append, bootargs,
sizeof(bootargs));
env_set("bootargs", bootargs);
}
debug("running: %s\n", localcmd);
return run_command_list(localcmd, strlen(localcmd), 0);
}
/*
* Loads fdt overlays specified in 'fdtoverlays'.
*/
#ifdef CONFIG_OF_LIBFDT_OVERLAY
static void label_boot_fdtoverlay(struct cmd_tbl *cmdtp, struct pxe_label *label)
{
char *fdtoverlay = label->fdtoverlays;
struct fdt_header *working_fdt;
char *fdtoverlay_addr_env;
ulong fdtoverlay_addr;
ulong fdt_addr;
int err;
/* Get the main fdt and map it */
fdt_addr = simple_strtoul(env_get("fdt_addr_r"), NULL, 16);
working_fdt = map_sysmem(fdt_addr, 0);
err = fdt_check_header(working_fdt);
if (err)
return;
/* Get the specific overlay loading address */
fdtoverlay_addr_env = env_get("fdtoverlay_addr_r");
if (!fdtoverlay_addr_env) {
printf("Invalid fdtoverlay_addr_r for loading overlays\n");
return;
}
fdtoverlay_addr = simple_strtoul(fdtoverlay_addr_env, NULL, 16);
/* Cycle over the overlay files and apply them in order */
do {
struct fdt_header *blob;
char *overlayfile;
char *end;
int len;
/* Drop leading spaces */
while (*fdtoverlay == ' ')
++fdtoverlay;
/* Copy a single filename if multiple provided */
end = strstr(fdtoverlay, " ");
if (end) {
len = (int)(end - fdtoverlay);
overlayfile = malloc(len + 1);
strncpy(overlayfile, fdtoverlay, len);
overlayfile[len] = '\0';
} else
overlayfile = fdtoverlay;
if (!strlen(overlayfile))
goto skip_overlay;
/* Load overlay file */
err = get_relfile_envaddr(cmdtp, overlayfile,
"fdtoverlay_addr_r");
if (err < 0) {
printf("Failed loading overlay %s\n", overlayfile);
goto skip_overlay;
}
/* Resize main fdt */
fdt_shrink_to_minimum(working_fdt, 8192);
blob = map_sysmem(fdtoverlay_addr, 0);
err = fdt_check_header(blob);
if (err) {
printf("Invalid overlay %s, skipping\n",
overlayfile);
goto skip_overlay;
}
err = fdt_overlay_apply_verbose(working_fdt, blob);
if (err) {
printf("Failed to apply overlay %s, skipping\n",
overlayfile);
goto skip_overlay;
}
skip_overlay:
if (end)
free(overlayfile);
} while ((fdtoverlay = strstr(fdtoverlay, " ")));
}
#endif
/*
* Boot according to the contents of a pxe_label.
*
* If we can't boot for any reason, we return. A successful boot never
* returns.
*
* The kernel will be stored in the location given by the 'kernel_addr_r'
* environment variable.
*
* If the label specifies an initrd file, it will be stored in the location
* given by the 'ramdisk_addr_r' environment variable.
*
* If the label specifies an 'append' line, its contents will overwrite that
* of the 'bootargs' environment variable.
*/
static int label_boot(struct cmd_tbl *cmdtp, struct pxe_label *label)
{
char *bootm_argv[] = { "bootm", NULL, NULL, NULL, NULL };
char initrd_str[28];
char mac_str[29] = "";
char ip_str[68] = "";
char *fit_addr = NULL;
int bootm_argc = 2;
int len = 0;
ulong kernel_addr;
void *buf;
label_print(label);
label->attempted = 1;
if (label->localboot) {
if (label->localboot_val >= 0)
label_localboot(label);
return 0;
}
if (!label->kernel) {
printf("No kernel given, skipping %s\n",
label->name);
return 1;
}
if (label->initrd) {
if (get_relfile_envaddr(cmdtp, label->initrd, "ramdisk_addr_r") < 0) {
printf("Skipping %s for failure retrieving initrd\n",
label->name);
return 1;
}
bootm_argv[2] = initrd_str;
strncpy(bootm_argv[2], env_get("ramdisk_addr_r"), 18);
strcat(bootm_argv[2], ":");
strncat(bootm_argv[2], env_get("filesize"), 9);
bootm_argc = 3;
}
if (get_relfile_envaddr(cmdtp, label->kernel, "kernel_addr_r") < 0) {
printf("Skipping %s for failure retrieving kernel\n",
label->name);
return 1;
}
if (label->ipappend & 0x1) {
sprintf(ip_str, " ip=%s:%s:%s:%s",
env_get("ipaddr"), env_get("serverip"),
env_get("gatewayip"), env_get("netmask"));
}
if (IS_ENABLED(CONFIG_CMD_NET)) {
if (label->ipappend & 0x2) {
int err;
strcpy(mac_str, " BOOTIF=");
err = format_mac_pxe(mac_str + 8, sizeof(mac_str) - 8);
if (err < 0)
mac_str[0] = '\0';
}
}
if ((label->ipappend & 0x3) || label->append) {
char bootargs[CONFIG_SYS_CBSIZE] = "";
char finalbootargs[CONFIG_SYS_CBSIZE];
if (strlen(label->append ?: "") +
strlen(ip_str) + strlen(mac_str) + 1 > sizeof(bootargs)) {
printf("bootarg overflow %zd+%zd+%zd+1 > %zd\n",
strlen(label->append ?: ""),
strlen(ip_str), strlen(mac_str),
sizeof(bootargs));
return 1;
}
if (label->append)
strncpy(bootargs, label->append, sizeof(bootargs));
strcat(bootargs, ip_str);
strcat(bootargs, mac_str);
cli_simple_process_macros(bootargs, finalbootargs,
sizeof(finalbootargs));
env_set("bootargs", finalbootargs);
printf("append: %s\n", finalbootargs);
}
bootm_argv[1] = env_get("kernel_addr_r");
/* for FIT, append the configuration identifier */
if (label->config) {
int len = strlen(bootm_argv[1]) + strlen(label->config) + 1;
fit_addr = malloc(len);
if (!fit_addr) {
printf("malloc fail (FIT address)\n");
return 1;
}
snprintf(fit_addr, len, "%s%s", bootm_argv[1], label->config);
bootm_argv[1] = fit_addr;
}
/*
* fdt usage is optional:
* It handles the following scenarios.
*
* Scenario 1: If fdt_addr_r specified and "fdt" or "fdtdir" label is
* defined in pxe file, retrieve fdt blob from server. Pass fdt_addr_r to
* bootm, and adjust argc appropriately.
*
* If retrieve fails and no exact fdt blob is specified in pxe file with
* "fdt" label, try Scenario 2.
*
* Scenario 2: If there is an fdt_addr specified, pass it along to
* bootm, and adjust argc appropriately.
*
* Scenario 3: fdt blob is not available.
*/
bootm_argv[3] = env_get("fdt_addr_r");
/* if fdt label is defined then get fdt from server */
if (bootm_argv[3]) {
char *fdtfile = NULL;
char *fdtfilefree = NULL;
if (label->fdt) {
fdtfile = label->fdt;
} else if (label->fdtdir) {
char *f1, *f2, *f3, *f4, *slash;
f1 = env_get("fdtfile");
if (f1) {
f2 = "";
f3 = "";
f4 = "";
} else {
/*
* For complex cases where this code doesn't
* generate the correct filename, the board
* code should set $fdtfile during early boot,
* or the boot scripts should set $fdtfile
* before invoking "pxe" or "sysboot".
*/
f1 = env_get("soc");
f2 = "-";
f3 = env_get("board");
f4 = ".dtb";
if (!f1) {
f1 = "";
f2 = "";
}
if (!f3) {
f2 = "";
f3 = "";
}
}
len = strlen(label->fdtdir);
if (!len)
slash = "./";
else if (label->fdtdir[len - 1] != '/')
slash = "/";
else
slash = "";
len = strlen(label->fdtdir) + strlen(slash) +
strlen(f1) + strlen(f2) + strlen(f3) +
strlen(f4) + 1;
fdtfilefree = malloc(len);
if (!fdtfilefree) {
printf("malloc fail (FDT filename)\n");
goto cleanup;
}
snprintf(fdtfilefree, len, "%s%s%s%s%s%s",
label->fdtdir, slash, f1, f2, f3, f4);
fdtfile = fdtfilefree;
}
if (fdtfile) {
int err = get_relfile_envaddr(cmdtp, fdtfile,
"fdt_addr_r");
free(fdtfilefree);
if (err < 0) {
bootm_argv[3] = NULL;
if (label->fdt) {
printf("Skipping %s for failure retrieving FDT\n",
label->name);
goto cleanup;
}
}
#ifdef CONFIG_OF_LIBFDT_OVERLAY
if (label->fdtoverlays)
label_boot_fdtoverlay(cmdtp, label);
#endif
} else {
bootm_argv[3] = NULL;
}
}
if (!bootm_argv[3])
bootm_argv[3] = env_get("fdt_addr");
if (bootm_argv[3]) {
if (!bootm_argv[2])
bootm_argv[2] = "-";
bootm_argc = 4;
}
kernel_addr = genimg_get_kernel_addr(bootm_argv[1]);
buf = map_sysmem(kernel_addr, 0);
/* Try bootm for legacy and FIT format image */
if (genimg_get_format(buf) != IMAGE_FORMAT_INVALID)
do_bootm(cmdtp, 0, bootm_argc, bootm_argv);
/* Try booting an AArch64 Linux kernel image */
else if (IS_ENABLED(CONFIG_CMD_BOOTI))
do_booti(cmdtp, 0, bootm_argc, bootm_argv);
/* Try booting a Image */
else if (IS_ENABLED(CONFIG_CMD_BOOTZ))
do_bootz(cmdtp, 0, bootm_argc, bootm_argv);
/* Try booting an x86_64 Linux kernel image */
else if (IS_ENABLED(CONFIG_CMD_ZBOOT))
do_zboot_parent(cmdtp, 0, bootm_argc, bootm_argv, NULL);
unmap_sysmem(buf);
cleanup:
if (fit_addr)
free(fit_addr);
return 1;
}
/*
* Tokens for the pxe file parser.
*/
enum token_type {
T_EOL,
T_STRING,
T_EOF,
T_MENU,
T_TITLE,
T_TIMEOUT,
T_LABEL,
T_KERNEL,
T_LINUX,
T_APPEND,
T_INITRD,
T_LOCALBOOT,
T_DEFAULT,
T_PROMPT,
T_INCLUDE,
T_FDT,
T_FDTDIR,
T_FDTOVERLAYS,
T_ONTIMEOUT,
T_IPAPPEND,
T_BACKGROUND,
T_INVALID
};
/*
* A token - given by a value and a type.
*/
struct token {
char *val;
enum token_type type;
};
/*
* Keywords recognized.
*/
static const struct token keywords[] = {
{"menu", T_MENU},
{"title", T_TITLE},
{"timeout", T_TIMEOUT},
{"default", T_DEFAULT},
{"prompt", T_PROMPT},
{"label", T_LABEL},
{"kernel", T_KERNEL},
{"linux", T_LINUX},
{"localboot", T_LOCALBOOT},
{"append", T_APPEND},
{"initrd", T_INITRD},
{"include", T_INCLUDE},
{"devicetree", T_FDT},
{"fdt", T_FDT},
{"devicetreedir", T_FDTDIR},
{"fdtdir", T_FDTDIR},
{"fdtoverlays", T_FDTOVERLAYS},
{"ontimeout", T_ONTIMEOUT,},
{"ipappend", T_IPAPPEND,},
{"background", T_BACKGROUND,},
{NULL, T_INVALID}
};
/*
* Since pxe(linux) files don't have a token to identify the start of a
* literal, we have to keep track of when we're in a state where a literal is
* expected vs when we're in a state a keyword is expected.
*/
enum lex_state {
L_NORMAL = 0,
L_KEYWORD,
L_SLITERAL
};
/*
* get_string retrieves a string from *p and stores it as a token in
* *t.
*
* get_string used for scanning both string literals and keywords.
*
* Characters from *p are copied into t-val until a character equal to
* delim is found, or a NUL byte is reached. If delim has the special value of
* ' ', any whitespace character will be used as a delimiter.
*
* If lower is unequal to 0, uppercase characters will be converted to
* lowercase in the result. This is useful to make keywords case
* insensitive.
*
* The location of *p is updated to point to the first character after the end
* of the token - the ending delimiter.
*
* On success, the new value of t->val is returned. Memory for t->val is
* allocated using malloc and must be free()'d to reclaim it. If insufficient
* memory is available, NULL is returned.
*/
static char *get_string(char **p, struct token *t, char delim, int lower)
{
char *b, *e;
size_t len, i;
/*
* b and e both start at the beginning of the input stream.
*
* e is incremented until we find the ending delimiter, or a NUL byte
* is reached. Then, we take e - b to find the length of the token.
*/
b = *p;
e = *p;
while (*e) {
if ((delim == ' ' && isspace(*e)) || delim == *e)
break;
e++;
}
len = e - b;
/*
* Allocate memory to hold the string, and copy it in, converting
* characters to lowercase if lower is != 0.
*/
t->val = malloc(len + 1);
if (!t->val)
return NULL;
for (i = 0; i < len; i++, b++) {
if (lower)
t->val[i] = tolower(*b);
else
t->val[i] = *b;
}
t->val[len] = '\0';
/*
* Update *p so the caller knows where to continue scanning.
*/
*p = e;
t->type = T_STRING;
return t->val;
}
/*
* Populate a keyword token with a type and value.
*/
static void get_keyword(struct token *t)
{
int i;
for (i = 0; keywords[i].val; i++) {
if (!strcmp(t->val, keywords[i].val)) {
t->type = keywords[i].type;
break;
}
}
}
/*
* Get the next token. We have to keep track of which state we're in to know
* if we're looking to get a string literal or a keyword.
*
* *p is updated to point at the first character after the current token.
*/
static void get_token(char **p, struct token *t, enum lex_state state)
{
char *c = *p;
t->type = T_INVALID;
/* eat non EOL whitespace */
while (isblank(*c))
c++;
/*
* eat comments. note that string literals can't begin with #, but
* can contain a # after their first character.
*/
if (*c == '#') {
while (*c && *c != '\n')
c++;
}
if (*c == '\n') {
t->type = T_EOL;
c++;
} else if (*c == '\0') {
t->type = T_EOF;
c++;
} else if (state == L_SLITERAL) {
get_string(&c, t, '\n', 0);
} else if (state == L_KEYWORD) {
/*
* when we expect a keyword, we first get the next string
* token delimited by whitespace, and then check if it
* matches a keyword in our keyword list. if it does, it's
* converted to a keyword token of the appropriate type, and
* if not, it remains a string token.
*/
get_string(&c, t, ' ', 1);
get_keyword(t);
}
*p = c;
}
/*
* Increment *c until we get to the end of the current line, or EOF.
*/
static void eol_or_eof(char **c)
{
while (**c && **c != '\n')
(*c)++;
}
/*
* All of these parse_* functions share some common behavior.
*
* They finish with *c pointing after the token they parse, and return 1 on
* success, or < 0 on error.
*/
/*
* Parse a string literal and store a pointer it at *dst. String literals
* terminate at the end of the line.
*/
static int parse_sliteral(char **c, char **dst)
{
struct token t;
char *s = *c;
get_token(c, &t, L_SLITERAL);
if (t.type != T_STRING) {
printf("Expected string literal: %.*s\n", (int)(*c - s), s);
return -EINVAL;
}
*dst = t.val;
return 1;
}
/*
* Parse a base 10 (unsigned) integer and store it at *dst.
*/
static int parse_integer(char **c, int *dst)
{
struct token t;
char *s = *c;
get_token(c, &t, L_SLITERAL);
if (t.type != T_STRING) {
printf("Expected string: %.*s\n", (int)(*c - s), s);
return -EINVAL;
}
*dst = simple_strtol(t.val, NULL, 10);
free(t.val);
return 1;
}
static int parse_pxefile_top(struct cmd_tbl *cmdtp, char *p, unsigned long base,
struct pxe_menu *cfg, int nest_level);
/*
* Parse an include statement, and retrieve and parse the file it mentions.
*
* base should point to a location where it's safe to store the file, and
* nest_level should indicate how many nested includes have occurred. For this
* include, nest_level has already been incremented and doesn't need to be
* incremented here.
*/
static int handle_include(struct cmd_tbl *cmdtp, char **c, unsigned long base,
struct pxe_menu *cfg, int nest_level)
{
char *include_path;
char *s = *c;
int err;
char *buf;
int ret;
err = parse_sliteral(c, &include_path);
if (err < 0) {
printf("Expected include path: %.*s\n", (int)(*c - s), s);
return err;
}
err = get_pxe_file(cmdtp, include_path, base);
if (err < 0) {
printf("Couldn't retrieve %s\n", include_path);
return err;
}
buf = map_sysmem(base, 0);
ret = parse_pxefile_top(cmdtp, buf, base, cfg, nest_level);
unmap_sysmem(buf);
return ret;
}
/*
* Parse lines that begin with 'menu'.
*
* base and nest are provided to handle the 'menu include' case.
*
* base should point to a location where it's safe to store the included file.
*
* nest_level should be 1 when parsing the top level pxe file, 2 when parsing
* a file it includes, 3 when parsing a file included by that file, and so on.
*/
static int parse_menu(struct cmd_tbl *cmdtp, char **c, struct pxe_menu *cfg,
unsigned long base, int nest_level)
{
struct token t;
char *s = *c;
int err = 0;
get_token(c, &t, L_KEYWORD);
switch (t.type) {
case T_TITLE:
err = parse_sliteral(c, &cfg->title);
break;
case T_INCLUDE:
err = handle_include(cmdtp, c, base, cfg, nest_level + 1);
break;
case T_BACKGROUND:
err = parse_sliteral(c, &cfg->bmp);
break;
default:
printf("Ignoring malformed menu command: %.*s\n",
(int)(*c - s), s);
}
if (err < 0)
return err;
eol_or_eof(c);
return 1;
}
/*
* Handles parsing a 'menu line' when we're parsing a label.
*/
static int parse_label_menu(char **c, struct pxe_menu *cfg,
struct pxe_label *label)
{
struct token t;
char *s;
s = *c;
get_token(c, &t, L_KEYWORD);
switch (t.type) {
case T_DEFAULT:
if (!cfg->default_label)
cfg->default_label = strdup(label->name);
if (!cfg->default_label)
return -ENOMEM;
break;
case T_LABEL:
parse_sliteral(c, &label->menu);
break;
default:
printf("Ignoring malformed menu command: %.*s\n",
(int)(*c - s), s);
}
eol_or_eof(c);
return 0;
}
/*
* Handles parsing a 'kernel' label.
* expecting "filename" or "<fit_filename>#cfg"
*/
static int parse_label_kernel(char **c, struct pxe_label *label)
{
char *s;
int err;
err = parse_sliteral(c, &label->kernel);
if (err < 0)
return err;
s = strstr(label->kernel, "#");
if (!s)
return 1;
label->config = malloc(strlen(s) + 1);
if (!label->config)
return -ENOMEM;
strcpy(label->config, s);
*s = 0;
return 1;
}
/*
* Parses a label and adds it to the list of labels for a menu.
*
* A label ends when we either get to the end of a file, or
* get some input we otherwise don't have a handler defined
* for.
*
*/
static int parse_label(char **c, struct pxe_menu *cfg)
{
struct token t;
int len;
char *s = *c;
struct pxe_label *label;
int err;
label = label_create();
if (!label)
return -ENOMEM;
err = parse_sliteral(c, &label->name);
if (err < 0) {
printf("Expected label name: %.*s\n", (int)(*c - s), s);
label_destroy(label);
return -EINVAL;
}
list_add_tail(&label->list, &cfg->labels);
while (1) {
s = *c;
get_token(c, &t, L_KEYWORD);
err = 0;
switch (t.type) {
case T_MENU:
err = parse_label_menu(c, cfg, label);
break;
case T_KERNEL:
case T_LINUX:
err = parse_label_kernel(c, label);
break;
case T_APPEND:
err = parse_sliteral(c, &label->append);
if (label->initrd)
break;
s = strstr(label->append, "initrd=");
if (!s)
break;
s += 7;
len = (int)(strchr(s, ' ') - s);
label->initrd = malloc(len + 1);
strncpy(label->initrd, s, len);
label->initrd[len] = '\0';
break;
case T_INITRD:
if (!label->initrd)
err = parse_sliteral(c, &label->initrd);
break;
case T_FDT:
if (!label->fdt)
err = parse_sliteral(c, &label->fdt);
break;
case T_FDTDIR:
if (!label->fdtdir)
err = parse_sliteral(c, &label->fdtdir);
break;
case T_FDTOVERLAYS:
if (!label->fdtoverlays)
err = parse_sliteral(c, &label->fdtoverlays);
break;
case T_LOCALBOOT:
label->localboot = 1;
err = parse_integer(c, &label->localboot_val);
break;
case T_IPAPPEND:
err = parse_integer(c, &label->ipappend);
break;
case T_EOL:
break;
default:
/*
* put the token back! we don't want it - it's the end
* of a label and whatever token this is, it's
* something for the menu level context to handle.
*/
*c = s;
return 1;
}
if (err < 0)
return err;
}
}
/*
* This 16 comes from the limit pxelinux imposes on nested includes.
*
* There is no reason at all we couldn't do more, but some limit helps prevent
* infinite (until crash occurs) recursion if a file tries to include itself.
*/
#define MAX_NEST_LEVEL 16
/*
* Entry point for parsing a menu file. nest_level indicates how many times
* we've nested in includes. It will be 1 for the top level menu file.
*
* Returns 1 on success, < 0 on error.
*/
static int parse_pxefile_top(struct cmd_tbl *cmdtp, char *p, unsigned long base,
struct pxe_menu *cfg, int nest_level)
{
struct token t;
char *s, *b, *label_name;
int err;
b = p;
if (nest_level > MAX_NEST_LEVEL) {
printf("Maximum nesting (%d) exceeded\n", MAX_NEST_LEVEL);
return -EMLINK;
}
while (1) {
s = p;
get_token(&p, &t, L_KEYWORD);
err = 0;
switch (t.type) {
case T_MENU:
cfg->prompt = 1;
err = parse_menu(cmdtp, &p, cfg,
base + ALIGN(strlen(b) + 1, 4),
nest_level);
break;
case T_TIMEOUT:
err = parse_integer(&p, &cfg->timeout);
break;
case T_LABEL:
err = parse_label(&p, cfg);
break;
case T_DEFAULT:
case T_ONTIMEOUT:
err = parse_sliteral(&p, &label_name);
if (label_name) {
if (cfg->default_label)
free(cfg->default_label);
cfg->default_label = label_name;
}
break;
case T_INCLUDE:
err = handle_include(cmdtp, &p,
base + ALIGN(strlen(b), 4), cfg,
nest_level + 1);
break;
case T_PROMPT:
eol_or_eof(&p);
break;
case T_EOL:
break;
case T_EOF:
return 1;
default:
printf("Ignoring unknown command: %.*s\n",
(int)(p - s), s);
eol_or_eof(&p);
}
if (err < 0)
return err;
}
}
/*
* Free the memory used by a pxe_menu and its labels.
*/
void destroy_pxe_menu(struct pxe_menu *cfg)
{
struct list_head *pos, *n;
struct pxe_label *label;
if (cfg->title)
free(cfg->title);
if (cfg->default_label)
free(cfg->default_label);
list_for_each_safe(pos, n, &cfg->labels) {
label = list_entry(pos, struct pxe_label, list);
label_destroy(label);
}
free(cfg);
}
/*
* Entry point for parsing a pxe file. This is only used for the top level
* file.
*
* Returns NULL if there is an error, otherwise, returns a pointer to a
* pxe_menu struct populated with the results of parsing the pxe file (and any
* files it includes). The resulting pxe_menu struct can be free()'d by using
* the destroy_pxe_menu() function.
*/
struct pxe_menu *parse_pxefile(struct cmd_tbl *cmdtp, unsigned long menucfg)
{
struct pxe_menu *cfg;
char *buf;
int r;
cfg = malloc(sizeof(struct pxe_menu));
if (!cfg)
return NULL;
memset(cfg, 0, sizeof(struct pxe_menu));
INIT_LIST_HEAD(&cfg->labels);
buf = map_sysmem(menucfg, 0);
r = parse_pxefile_top(cmdtp, buf, menucfg, cfg, 1);
unmap_sysmem(buf);
if (r < 0) {
destroy_pxe_menu(cfg);
return NULL;
}
return cfg;
}
/*
* Converts a pxe_menu struct into a menu struct for use with U-Boot's generic
* menu code.
*/
static struct menu *pxe_menu_to_menu(struct pxe_menu *cfg)
{
struct pxe_label *label;
struct list_head *pos;
struct menu *m;
int err;
int i = 1;
char *default_num = NULL;
/*
* Create a menu and add items for all the labels.
*/
m = menu_create(cfg->title, DIV_ROUND_UP(cfg->timeout, 10),
cfg->prompt, NULL, label_print, NULL, NULL);
if (!m)
return NULL;
list_for_each(pos, &cfg->labels) {
label = list_entry(pos, struct pxe_label, list);
sprintf(label->num, "%d", i++);
if (menu_item_add(m, label->num, label) != 1) {
menu_destroy(m);
return NULL;
}
if (cfg->default_label &&
(strcmp(label->name, cfg->default_label) == 0))
default_num = label->num;
}
/*
* After we've created items for each label in the menu, set the
* menu's default label if one was specified.
*/
if (default_num) {
err = menu_default_set(m, default_num);
if (err != 1) {
if (err != -ENOENT) {
menu_destroy(m);
return NULL;
}
printf("Missing default: %s\n", cfg->default_label);
}
}
return m;
}
/*
* Try to boot any labels we have yet to attempt to boot.
*/
static void boot_unattempted_labels(struct cmd_tbl *cmdtp, struct pxe_menu *cfg)
{
struct list_head *pos;
struct pxe_label *label;
list_for_each(pos, &cfg->labels) {
label = list_entry(pos, struct pxe_label, list);
if (!label->attempted)
label_boot(cmdtp, label);
}
}
/*
* Boot the system as prescribed by a pxe_menu.
*
* Use the menu system to either get the user's choice or the default, based
* on config or user input. If there is no default or user's choice,
* attempted to boot labels in the order they were given in pxe files.
* If the default or user's choice fails to boot, attempt to boot other
* labels in the order they were given in pxe files.
*
* If this function returns, there weren't any labels that successfully
* booted, or the user interrupted the menu selection via ctrl+c.
*/
void handle_pxe_menu(struct cmd_tbl *cmdtp, struct pxe_menu *cfg)
{
void *choice;
struct menu *m;
int err;
if (IS_ENABLED(CONFIG_CMD_BMP)) {
/* display BMP if available */
if (cfg->bmp) {
if (get_relfile(cmdtp, cfg->bmp, image_load_addr)) {
if (CONFIG_IS_ENABLED(CMD_CLS))
run_command("cls", 0);
bmp_display(image_load_addr,
BMP_ALIGN_CENTER, BMP_ALIGN_CENTER);
} else {
printf("Skipping background bmp %s for failure\n",
cfg->bmp);
}
}
}
m = pxe_menu_to_menu(cfg);
if (!m)
return;
err = menu_get_choice(m, &choice);
menu_destroy(m);
/*
* err == 1 means we got a choice back from menu_get_choice.
*
* err == -ENOENT if the menu was setup to select the default but no
* default was set. in that case, we should continue trying to boot
* labels that haven't been attempted yet.
*
* otherwise, the user interrupted or there was some other error and
* we give up.
*/
if (err == 1) {
err = label_boot(cmdtp, choice);
if (!err)
return;
} else if (err != -ENOENT) {
return;
}
boot_unattempted_labels(cmdtp, cfg);
}