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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 <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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