diff options
Diffstat (limited to 'arch/arc/lib/bootm.c')
-rw-r--r-- | arch/arc/lib/bootm.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/arch/arc/lib/bootm.c b/arch/arc/lib/bootm.c new file mode 100644 index 0000000..d185a50 --- /dev/null +++ b/arch/arc/lib/bootm.c @@ -0,0 +1,106 @@ +/* + * Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#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(); + flush_dcache_all(); + invalidate_icache_all(); + + return 0; +} + +/* Subcommand: PREP */ +static void boot_prep_linux(bootm_headers_t *images) +{ + if (image_setup_linux(images)) + hang(); +} + +/* Subcommand: GO */ +static void boot_jump_linux(bootm_headers_t *images, int flag) +{ + void (*kernel_entry)(int zero, int arch, uint params); + unsigned int r0, r2; + int fake = (flag & BOOTM_STATE_OS_FAKE_GO); + + kernel_entry = (void (*)(int, int, uint))images->ep; + + debug("## Transferring control to Linux (at address %08lx)...\n", + (ulong) 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"); + + cleanup_before_linux(); + + if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) { + r0 = 2; + r2 = (unsigned int)images->ft_addr; + } else { + r0 = 1; + r2 = (unsigned int)getenv("bootargs"); + } + + if (!fake) + 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) { + 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 0; +} |