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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
*/
#include <asm/cache.h>
#include <common.h>
DECLARE_GLOBAL_DATA_PTR;
static ulong get_sp(void)
{
ulong ret;
asm("mov %0, sp" : "=r"(ret) : );
return ret;
}
void arch_lmb_reserve(struct lmb *lmb)
{
ulong sp;
/*
* Booting a (Linux) kernel image
*
* Allocate space for command line and board info - the
* address should be as high as possible within the reach of
* the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
* memory, which means far enough below the current stack
* pointer.
*/
sp = get_sp();
debug("## Current stack ends at 0x%08lx ", sp);
/* adjust sp by 4K to be safe */
sp -= 4096;
lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp));
}
static int cleanup_before_linux(void)
{
disable_interrupts();
sync_n_cleanup_cache_all();
return 0;
}
__weak int board_prep_linux(bootm_headers_t *images) { return 0; }
/* Subcommand: PREP */
static int boot_prep_linux(bootm_headers_t *images)
{
int ret;
ret = image_setup_linux(images);
if (ret)
return ret;
return board_prep_linux(images);
}
/* Generic implementation for single core CPU */
__weak void board_jump_and_run(ulong entry, int zero, int arch, uint params)
{
void (*kernel_entry)(int zero, int arch, uint params);
kernel_entry = (void (*)(int, int, uint))entry;
kernel_entry(zero, arch, params);
}
/* Subcommand: GO */
static void boot_jump_linux(bootm_headers_t *images, int flag)
{
ulong kernel_entry;
unsigned int r0, r2;
int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
kernel_entry = images->ep;
debug("## Transferring control to Linux (at address %08lx)...\n",
kernel_entry);
bootstage_mark(BOOTSTAGE_ID_RUN_OS);
printf("\nStarting kernel ...%s\n\n", fake ?
"(fake run for tracing)" : "");
bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
r0 = 2;
r2 = (unsigned int)images->ft_addr;
} else {
r0 = 1;
r2 = (unsigned int)env_get("bootargs");
}
cleanup_before_linux();
if (!fake)
board_jump_and_run(kernel_entry, r0, 0, r2);
}
int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
{
/* No need for those on ARC */
if ((flag & BOOTM_STATE_OS_BD_T) || (flag & BOOTM_STATE_OS_CMDLINE))
return -1;
if (flag & BOOTM_STATE_OS_PREP)
return boot_prep_linux(images);
if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
boot_jump_linux(images, flag);
return 0;
}
return -1;
}
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