mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-20 17:08:52 +09:00
![Peter Tyser](/assets/img/avatar_default.png)
Previously, non-e500 architectures only unlocked their data cache which was used as early RAM when booting to Linux using the "bootm" command. This change causes all PPC boards with CONFIG_SYS_INIT_RAM_LOCK defined to unlock their data cache during U-Boot's initialization. This improves U-Boot performance and provides a common cache state when booting to different OSes. Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
357 lines
8.6 KiB
C
357 lines
8.6 KiB
C
/*
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* (C) Copyright 2008 Semihalf
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*
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* (C) Copyright 2000-2006
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <watchdog.h>
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#include <command.h>
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#include <image.h>
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#include <malloc.h>
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#include <u-boot/zlib.h>
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#include <bzlib.h>
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#include <environment.h>
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#include <asm/byteorder.h>
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#if defined(CONFIG_OF_LIBFDT)
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#include <fdt.h>
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#include <libfdt.h>
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#include <fdt_support.h>
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#endif
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DECLARE_GLOBAL_DATA_PTR;
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extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]);
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extern ulong get_effective_memsize(void);
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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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#ifndef CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE
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#define CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE (768*1024*1024)
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#endif
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static void boot_jump_linux(bootm_headers_t *images)
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{
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void (*kernel)(bd_t *, ulong r4, ulong r5, ulong r6,
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ulong r7, ulong r8, ulong r9);
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#ifdef CONFIG_OF_LIBFDT
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char *of_flat_tree = images->ft_addr;
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#endif
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kernel = (void (*)(bd_t *, ulong, ulong, ulong,
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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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show_boot_progress (15);
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#if defined(CONFIG_OF_LIBFDT)
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if (of_flat_tree) { /* device tree; boot new style */
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/*
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* Linux Kernel Parameters (passing device tree):
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* r3: pointer to the fdt
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* r4: 0
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* r5: 0
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* r6: epapr magic
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* r7: size of IMA in bytes
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* r8: 0
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* r9: 0
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*/
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#if defined(CONFIG_85xx) || defined(CONFIG_440)
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#define EPAPR_MAGIC (0x45504150)
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#else
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#define EPAPR_MAGIC (0x65504150)
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#endif
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debug (" Booting using OF flat tree...\n");
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(*kernel) ((bd_t *)of_flat_tree, 0, 0, EPAPR_MAGIC,
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CONFIG_SYS_BOOTMAPSZ, 0, 0);
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/* does not return */
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} else
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#endif
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{
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/*
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* Linux Kernel Parameters (passing board info data):
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* r3: ptr to board info data
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* r4: initrd_start or 0 if no initrd
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* r5: initrd_end - unused if r4 is 0
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* r6: Start of command line string
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* r7: End of command line string
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* r8: 0
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* r9: 0
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*/
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ulong cmd_start = images->cmdline_start;
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ulong cmd_end = images->cmdline_end;
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ulong initrd_start = images->initrd_start;
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ulong initrd_end = images->initrd_end;
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bd_t *kbd = images->kbd;
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debug (" Booting using board info...\n");
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(*kernel) (kbd, initrd_start, initrd_end,
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cmd_start, cmd_end, 0, 0);
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/* does not return */
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}
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return ;
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}
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void arch_lmb_reserve(struct lmb *lmb)
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{
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phys_size_t bootm_size;
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ulong size, sp, bootmap_base;
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bootmap_base = getenv_bootm_low();
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bootm_size = getenv_bootm_size();
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#ifdef DEBUG
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if (((u64)bootmap_base + bootm_size) >
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(CONFIG_SYS_SDRAM_BASE + (u64)gd->ram_size))
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puts("WARNING: bootm_low + bootm_size exceed total memory\n");
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if ((bootmap_base + bootm_size) > get_effective_memsize())
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puts("WARNING: bootm_low + bootm_size exceed eff. memory\n");
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#endif
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size = min(bootm_size, get_effective_memsize());
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size = min(size, CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE);
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if (size < bootm_size) {
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ulong base = bootmap_base + size;
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printf("WARNING: adjusting available memory to %lx\n", size);
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lmb_reserve(lmb, base, bootm_size - size);
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}
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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\n", 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 + get_effective_memsize() - sp));
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return ;
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}
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static void boot_prep_linux(void)
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{
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#if (CONFIG_NUM_CPUS > 1)
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/* if we are MP make sure to flush the dcache() to any changes are made
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* visibile to all other cores */
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flush_dcache();
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#endif
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return ;
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}
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static int boot_cmdline_linux(bootm_headers_t *images)
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{
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ulong bootmap_base = getenv_bootm_low();
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ulong of_size = images->ft_len;
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struct lmb *lmb = &images->lmb;
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ulong *cmd_start = &images->cmdline_start;
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ulong *cmd_end = &images->cmdline_end;
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int ret = 0;
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if (!of_size) {
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/* allocate space and init command line */
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ret = boot_get_cmdline (lmb, cmd_start, cmd_end, bootmap_base);
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if (ret) {
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puts("ERROR with allocation of cmdline\n");
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return ret;
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}
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}
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return ret;
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}
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static int boot_bd_t_linux(bootm_headers_t *images)
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{
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ulong bootmap_base = getenv_bootm_low();
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ulong of_size = images->ft_len;
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struct lmb *lmb = &images->lmb;
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bd_t **kbd = &images->kbd;
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int ret = 0;
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if (!of_size) {
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/* allocate space for kernel copy of board info */
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ret = boot_get_kbd (lmb, kbd, bootmap_base);
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if (ret) {
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puts("ERROR with allocation of kernel bd\n");
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return ret;
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}
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set_clocks_in_mhz(*kbd);
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}
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return ret;
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}
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static int boot_body_linux(bootm_headers_t *images)
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{
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ulong rd_len;
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struct lmb *lmb = &images->lmb;
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ulong *initrd_start = &images->initrd_start;
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ulong *initrd_end = &images->initrd_end;
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#if defined(CONFIG_OF_LIBFDT)
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ulong bootmap_base = getenv_bootm_low();
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ulong of_size = images->ft_len;
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char **of_flat_tree = &images->ft_addr;
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#endif
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int ret;
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/* allocate space and init command line */
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ret = boot_cmdline_linux(images);
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if (ret)
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return ret;
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/* allocate space for kernel copy of board info */
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ret = boot_bd_t_linux(images);
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if (ret)
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return ret;
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rd_len = images->rd_end - images->rd_start;
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ret = boot_ramdisk_high (lmb, images->rd_start, rd_len, initrd_start, initrd_end);
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if (ret)
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return ret;
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#if defined(CONFIG_OF_LIBFDT)
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ret = boot_relocate_fdt(lmb, bootmap_base, of_flat_tree, &of_size);
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if (ret)
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return ret;
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/*
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* Add the chosen node if it doesn't exist, add the env and bd_t
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* if the user wants it (the logic is in the subroutines).
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*/
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if (of_size) {
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if (fdt_chosen(*of_flat_tree, 1) < 0) {
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puts ("ERROR: ");
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puts ("/chosen node create failed");
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puts (" - must RESET the board to recover.\n");
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return -1;
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}
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#ifdef CONFIG_OF_BOARD_SETUP
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/* Call the board-specific fixup routine */
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ft_board_setup(*of_flat_tree, gd->bd);
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#endif
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/* Delete the old LMB reservation */
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lmb_free(lmb, (phys_addr_t)(u32)*of_flat_tree,
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(phys_size_t)fdt_totalsize(*of_flat_tree));
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ret = fdt_resize(*of_flat_tree);
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if (ret < 0)
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return ret;
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of_size = ret;
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if (*initrd_start && *initrd_end)
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of_size += FDT_RAMDISK_OVERHEAD;
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/* Create a new LMB reservation */
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lmb_reserve(lmb, (ulong)*of_flat_tree, of_size);
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/* fixup the initrd now that we know where it should be */
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if (*initrd_start && *initrd_end)
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fdt_initrd(*of_flat_tree, *initrd_start, *initrd_end, 1);
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}
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#endif /* CONFIG_OF_LIBFDT */
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return 0;
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}
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__attribute__((noinline))
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int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
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{
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int ret;
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if (flag & BOOTM_STATE_OS_CMDLINE) {
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boot_cmdline_linux(images);
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return 0;
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}
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if (flag & BOOTM_STATE_OS_BD_T) {
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boot_bd_t_linux(images);
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return 0;
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}
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if (flag & BOOTM_STATE_OS_PREP) {
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boot_prep_linux();
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return 0;
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}
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if (flag & BOOTM_STATE_OS_GO) {
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boot_jump_linux(images);
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return 0;
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}
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boot_prep_linux();
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ret = boot_body_linux(images);
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if (ret)
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return ret;
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boot_jump_linux(images);
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return 0;
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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( "mr %0,1": "=r"(sp) : );
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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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if ((s = getenv ("clocks_in_mhz")) != NULL) {
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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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#if defined(CONFIG_MPC8220)
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kbd->bi_inpfreq /= 1000000L;
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kbd->bi_pcifreq /= 1000000L;
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kbd->bi_pevfreq /= 1000000L;
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kbd->bi_flbfreq /= 1000000L;
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kbd->bi_vcofreq /= 1000000L;
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#endif
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#if defined(CONFIG_CPM2)
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kbd->bi_cpmfreq /= 1000000L;
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kbd->bi_brgfreq /= 1000000L;
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kbd->bi_sccfreq /= 1000000L;
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kbd->bi_vco /= 1000000L;
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#endif
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#if defined(CONFIG_MPC5xxx)
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kbd->bi_ipbfreq /= 1000000L;
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kbd->bi_pcifreq /= 1000000L;
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#endif /* CONFIG_MPC5xxx */
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}
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}
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