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/*
* (C) Copyright 2003
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
#include <image.h>
#include <u-boot/zlib.h>
#include <asm/byteorder.h>
#include <asm/addrspace.h>
DECLARE_GLOBAL_DATA_PTR;
#define LINUX_MAX_ENVS 256
#define LINUX_MAX_ARGS 256
static int linux_argc;
static char **linux_argv;
static char **linux_env;
static char *linux_env_p;
static int linux_env_idx;
static void linux_params_init(ulong start, char *commandline);
static void linux_env_set(char *env_name, char *env_val);
static ulong arch_get_sp(void)
{
ulong ret;
__asm__ __volatile__("move %0, $sp" : "=r"(ret) : );
return ret;
}
void arch_lmb_reserve(struct lmb *lmb)
{
ulong sp;
sp = arch_get_sp();
debug("## Current stack ends at 0x%08lx\n", sp);
/* adjust sp by 4K to be safe */
sp -= 4096;
lmb_reserve(lmb, sp, CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp);
}
static void boot_prep_linux(bootm_headers_t *images)
{
char *commandline = getenv("bootargs");
char env_buf[12];
char *cp;
linux_params_init(UNCACHED_SDRAM(gd->bd->bi_boot_params), commandline);
#ifdef CONFIG_MEMSIZE_IN_BYTES
sprintf(env_buf, "%lu", (ulong)gd->ram_size);
debug("## Giving linux memsize in bytes, %lu\n", (ulong)gd->ram_size);
#else
sprintf(env_buf, "%lu", (ulong)(gd->ram_size >> 20));
debug("## Giving linux memsize in MB, %lu\n",
(ulong)(gd->ram_size >> 20));
#endif /* CONFIG_MEMSIZE_IN_BYTES */
linux_env_set("memsize", env_buf);
sprintf(env_buf, "0x%08X", (uint) UNCACHED_SDRAM(images->rd_start));
linux_env_set("initrd_start", env_buf);
sprintf(env_buf, "0x%X", (uint) (images->rd_end - images->rd_start));
linux_env_set("initrd_size", env_buf);
sprintf(env_buf, "0x%08X", (uint) (gd->bd->bi_flashstart));
linux_env_set("flash_start", env_buf);
sprintf(env_buf, "0x%X", (uint) (gd->bd->bi_flashsize));
linux_env_set("flash_size", env_buf);
cp = getenv("ethaddr");
if (cp)
linux_env_set("ethaddr", cp);
cp = getenv("eth1addr");
if (cp)
linux_env_set("eth1addr", cp);
}
static void boot_jump_linux(bootm_headers_t *images)
{
typedef void __noreturn (*kernel_entry_t)(int, ulong, ulong, ulong);
kernel_entry_t kernel = (kernel_entry_t) images->ep;
debug("## Transferring control to Linux (at address %p) ...\n", kernel);
bootstage_mark(BOOTSTAGE_ID_RUN_OS);
/* we assume that the kernel is in place */
printf("\nStarting kernel ...\n\n");
kernel(linux_argc, (ulong)linux_argv, (ulong)linux_env, 0);
}
int do_bootm_linux(int flag, int argc, char * const argv[],
bootm_headers_t *images)
{
/* No need for those on MIPS */
if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
return -1;
if (flag & BOOTM_STATE_OS_PREP) {
boot_prep_linux(images);
return 0;
}
if (flag & BOOTM_STATE_OS_GO) {
boot_jump_linux(images);
return 0;
}
boot_prep_linux(images);
boot_jump_linux(images);
/* does not return */
return 1;
}
static void linux_params_init(ulong start, char *line)
{
char *next, *quote, *argp;
linux_argc = 1;
linux_argv = (char **)start;
linux_argv[0] = 0;
argp = (char *)(linux_argv + LINUX_MAX_ARGS);
next = line;
while (line && *line && linux_argc < LINUX_MAX_ARGS) {
quote = strchr(line, '"');
next = strchr(line, ' ');
while (next && quote && quote < next) {
/*
* we found a left quote before the next blank
* now we have to find the matching right quote
*/
next = strchr(quote + 1, '"');
if (next) {
quote = strchr(next + 1, '"');
next = strchr(next + 1, ' ');
}
}
if (!next)
next = line + strlen(line);
linux_argv[linux_argc] = argp;
memcpy(argp, line, next - line);
argp[next - line] = 0;
argp += next - line + 1;
linux_argc++;
if (*next)
next++;
line = next;
}
linux_env = (char **)(((ulong) argp + 15) & ~15);
linux_env[0] = 0;
linux_env_p = (char *)(linux_env + LINUX_MAX_ENVS);
linux_env_idx = 0;
}
static void linux_env_set(char *env_name, char *env_val)
{
if (linux_env_idx < LINUX_MAX_ENVS - 1) {
linux_env[linux_env_idx] = linux_env_p;
strcpy(linux_env_p, env_name);
linux_env_p += strlen(env_name);
strcpy(linux_env_p, "=");
linux_env_p += 1;
strcpy(linux_env_p, env_val);
linux_env_p += strlen(env_val);
linux_env_p++;
linux_env[++linux_env_idx] = 0;
}
}
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