mirror of
https://github.com/AsahiLinux/u-boot
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125 lines
2.7 KiB
C
125 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2003
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*/
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#include <common.h>
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#include <bootstage.h>
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#include <command.h>
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#include <env.h>
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#include <image.h>
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#include <lmb.h>
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#include <log.h>
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#include <u-boot/zlib.h>
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#include <bzlib.h>
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#include <watchdog.h>
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#include <asm/byteorder.h>
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#ifdef CONFIG_SHOW_BOOT_PROGRESS
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# include <status_led.h>
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#endif
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DECLARE_GLOBAL_DATA_PTR;
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#define PHYSADDR(x) x
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#define LINUX_MAX_ENVS 256
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#define LINUX_MAX_ARGS 256
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static ulong get_sp (void);
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static void set_clocks_in_mhz (bd_t *kbd);
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void arch_lmb_reserve(struct lmb *lmb)
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{
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ulong sp;
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/*
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* Booting a (Linux) kernel image
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*
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* Allocate space for command line and board info - the
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* address should be as high as possible within the reach of
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* the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
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* memory, which means far enough below the current stack
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* pointer.
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*/
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sp = get_sp();
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debug ("## Current stack ends at 0x%08lx ", sp);
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/* adjust sp by 1K to be safe */
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sp -= 1024;
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lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + gd->ram_size - sp));
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}
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int do_bootm_linux(int flag, int argc, char *const argv[],
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bootm_headers_t *images)
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{
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int ret;
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bd_t *kbd;
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void (*kernel) (bd_t *, ulong, ulong, ulong, ulong);
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struct lmb *lmb = &images->lmb;
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/*
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* allow the PREP bootm subcommand, it is required for bootm to work
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*/
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if (flag & BOOTM_STATE_OS_PREP)
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return 0;
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if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
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return 1;
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/* allocate space for kernel copy of board info */
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ret = boot_get_kbd (lmb, &kbd);
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if (ret) {
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puts("ERROR with allocation of kernel bd\n");
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goto error;
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}
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set_clocks_in_mhz(kbd);
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ret = image_setup_linux(images);
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if (ret)
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goto error;
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kernel = (void (*)(bd_t *, ulong, ulong, ulong, ulong))images->ep;
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debug("## Transferring control to Linux (at address %08lx) ...\n",
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(ulong) kernel);
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bootstage_mark(BOOTSTAGE_ID_RUN_OS);
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/*
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* Linux Kernel Parameters (passing board info data):
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* sp+00: Ignore, side effect of using jsr to jump to kernel
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* sp+04: ptr to board info data
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* sp+08: initrd_start or 0 if no initrd
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* sp+12: initrd_end - unused if initrd_start is 0
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* sp+16: Start of command line string
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* sp+20: End of command line string
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*/
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(*kernel)(kbd, images->initrd_start, images->initrd_end,
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images->cmdline_start, images->cmdline_end);
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/* does not return */
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error:
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return 1;
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}
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static ulong get_sp (void)
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{
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ulong sp;
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asm("movel %%a7, %%d0\n"
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"movel %%d0, %0\n": "=d"(sp): :"%d0");
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return sp;
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}
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static void set_clocks_in_mhz (bd_t *kbd)
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{
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char *s;
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s = env_get("clocks_in_mhz");
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if (s) {
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/* convert all clock information to MHz */
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kbd->bi_intfreq /= 1000000L;
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kbd->bi_busfreq /= 1000000L;
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}
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}
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