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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2007 Michal Simek
* (C) Copyright 2004 Atmark Techno, Inc.
*
* Michal SIMEK <monstr@monstr.eu>
* Yasushi SHOJI <yashi@atmark-techno.com>
*/
#include <common.h>
#include <bootstage.h>
#include <command.h>
#include <cpu_func.h>
#include <env.h>
#include <fdt_support.h>
#include <hang.h>
#include <image.h>
#include <lmb.h>
#include <log.h>
#include <asm/cache.h>
#include <u-boot/zlib.h>
#include <asm/byteorder.h>
DECLARE_GLOBAL_DATA_PTR;
static ulong get_sp(void)
{
ulong ret;
asm("addik %0, r1, 0" : "=r"(ret) : );
return ret;
}
void arch_lmb_reserve(struct lmb *lmb)
{
ulong sp, bank_end;
int bank;
/*
* 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;
for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) {
if (sp < gd->bd->bi_dram[bank].start)
continue;
bank_end = gd->bd->bi_dram[bank].start +
gd->bd->bi_dram[bank].size;
if (sp >= bank_end)
continue;
lmb_reserve(lmb, sp, bank_end - sp);
break;
}
}
static void boot_jump_linux(bootm_headers_t *images, int flag)
{
void (*thekernel)(char *cmdline, ulong rd, ulong dt);
ulong dt = (ulong)images->ft_addr;
ulong rd_start = images->initrd_start;
ulong cmdline = images->cmdline_start;
int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
thekernel = (void (*)(char *, ulong, ulong))images->ep;
debug("## Transferring control to Linux (at address 0x%08lx) ",
(ulong)thekernel);
debug("cmdline 0x%08lx, ramdisk 0x%08lx, FDT 0x%08lx...\n",
cmdline, rd_start, dt);
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");
#ifdef XILINX_USE_DCACHE
flush_cache(0, XILINX_DCACHE_BYTE_SIZE);
#endif
if (!fake) {
/*
* Linux Kernel Parameters (passing device tree):
* r5: pointer to command line
* r6: pointer to ramdisk
* r7: pointer to the fdt, followed by the board info data
*/
thekernel((char *)cmdline, rd_start, dt);
/* does not return */
}
}
static void boot_prep_linux(bootm_headers_t *images)
{
if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
debug("using: FDT\n");
if (image_setup_linux(images)) {
printf("FDT creation failed! hanging...");
hang();
}
}
}
int do_bootm_linux(int flag, int argc, char *const argv[],
bootm_headers_t *images)
{
images->cmdline_start = (ulong)env_get("bootargs");
/* cmdline init is the part of 'prep' and nothing to do for 'bdt' */
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 | BOOTM_STATE_OS_FAKE_GO)) {
boot_jump_linux(images, flag);
return 0;
}
boot_prep_linux(images);
boot_jump_linux(images, flag);
return 1;
}
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