uboot/arch/powerpc/lib/bootm.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * (C) Copyright 2008 Semihalf
   4 *
   5 * (C) Copyright 2000-2006
   6 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   7 */
   8
   9
  10#include <common.h>
  11#include <bootstage.h>
  12#include <cpu_func.h>
  13#include <env.h>
  14#include <init.h>
  15#include <lmb.h>
  16#include <log.h>
  17#include <watchdog.h>
  18#include <command.h>
  19#include <image.h>
  20#include <malloc.h>
  21#include <asm/global_data.h>
  22#include <u-boot/zlib.h>
  23#include <bzlib.h>
  24#include <asm/byteorder.h>
  25#include <asm/mp.h>
  26#include <bootm.h>
  27#include <vxworks.h>
  28
  29#if defined(CONFIG_OF_LIBFDT)
  30#include <linux/libfdt.h>
  31#include <fdt_support.h>
  32#endif
  33
  34#ifdef CONFIG_SYS_INIT_RAM_LOCK
  35#include <asm/cache.h>
  36#endif
  37
  38DECLARE_GLOBAL_DATA_PTR;
  39
  40static ulong get_sp (void);
  41extern void ft_fixup_num_cores(void *blob);
  42static void set_clocks_in_mhz (struct bd_info *kbd);
  43
  44#ifndef CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE
  45#define CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE        (768*1024*1024)
  46#endif
  47
  48static void boot_jump_linux(bootm_headers_t *images)
  49{
  50        void    (*kernel)(struct bd_info *, ulong r4, ulong r5, ulong r6,
  51                              ulong r7, ulong r8, ulong r9);
  52#ifdef CONFIG_OF_LIBFDT
  53        char *of_flat_tree = images->ft_addr;
  54#endif
  55
  56        kernel = (void (*)(struct bd_info *, ulong, ulong, ulong,
  57                           ulong, ulong, ulong))images->ep;
  58        debug("## Transferring control to Linux (at address %08lx) ...\n",
  59              (ulong)kernel);
  60
  61        bootstage_mark(BOOTSTAGE_ID_RUN_OS);
  62
  63#ifdef CONFIG_BOOTSTAGE_FDT
  64        bootstage_fdt_add_report();
  65#endif
  66#ifdef CONFIG_BOOTSTAGE_REPORT
  67        bootstage_report();
  68#endif
  69
  70#if defined(CONFIG_SYS_INIT_RAM_LOCK) && !defined(CONFIG_E500)
  71        unlock_ram_in_cache();
  72#endif
  73
  74#if defined(CONFIG_OF_LIBFDT)
  75        if (of_flat_tree) {     /* device tree; boot new style */
  76                /*
  77                 * Linux Kernel Parameters (passing device tree):
  78                 *   r3: pointer to the fdt
  79                 *   r4: 0
  80                 *   r5: 0
  81                 *   r6: epapr magic
  82                 *   r7: size of IMA in bytes
  83                 *   r8: 0
  84                 *   r9: 0
  85                 */
  86                debug("   Booting using OF flat tree...\n");
  87                WATCHDOG_RESET ();
  88                (*kernel) ((struct bd_info *)of_flat_tree, 0, 0, EPAPR_MAGIC,
  89                           env_get_bootm_mapsize(), 0, 0);
  90                /* does not return */
  91        } else
  92#endif
  93        {
  94                /*
  95                 * Linux Kernel Parameters (passing board info data):
  96                 *   r3: ptr to board info data
  97                 *   r4: initrd_start or 0 if no initrd
  98                 *   r5: initrd_end - unused if r4 is 0
  99                 *   r6: Start of command line string
 100                 *   r7: End   of command line string
 101                 *   r8: 0
 102                 *   r9: 0
 103                 */
 104                ulong cmd_start = images->cmdline_start;
 105                ulong cmd_end = images->cmdline_end;
 106                ulong initrd_start = images->initrd_start;
 107                ulong initrd_end = images->initrd_end;
 108                struct bd_info *kbd = images->kbd;
 109
 110                debug("   Booting using board info...\n");
 111                WATCHDOG_RESET ();
 112                (*kernel) (kbd, initrd_start, initrd_end,
 113                           cmd_start, cmd_end, 0, 0);
 114                /* does not return */
 115        }
 116        return ;
 117}
 118
 119void arch_lmb_reserve(struct lmb *lmb)
 120{
 121        phys_size_t bootm_size;
 122        ulong size, sp, bootmap_base;
 123
 124        bootmap_base = env_get_bootm_low();
 125        bootm_size = env_get_bootm_size();
 126
 127#ifdef DEBUG
 128        if (((u64)bootmap_base + bootm_size) >
 129            (CONFIG_SYS_SDRAM_BASE + (u64)gd->ram_size))
 130                puts("WARNING: bootm_low + bootm_size exceed total memory\n");
 131        if ((bootmap_base + bootm_size) > get_effective_memsize())
 132                puts("WARNING: bootm_low + bootm_size exceed eff. memory\n");
 133#endif
 134
 135        size = min(bootm_size, get_effective_memsize());
 136        size = min(size, (ulong)CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE);
 137
 138        if (size < bootm_size) {
 139                ulong base = bootmap_base + size;
 140                printf("WARNING: adjusting available memory to %lx\n", size);
 141                lmb_reserve(lmb, base, bootm_size - size);
 142        }
 143
 144        /*
 145         * Booting a (Linux) kernel image
 146         *
 147         * Allocate space for command line and board info - the
 148         * address should be as high as possible within the reach of
 149         * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
 150         * memory, which means far enough below the current stack
 151         * pointer.
 152         */
 153        sp = get_sp();
 154        debug("## Current stack ends at 0x%08lx\n", sp);
 155
 156        /* adjust sp by 4K to be safe */
 157        sp -= 4096;
 158        lmb_reserve(lmb, sp, (CONFIG_SYS_SDRAM_BASE + get_effective_memsize() - sp));
 159
 160#ifdef CONFIG_MP
 161        cpu_mp_lmb_reserve(lmb);
 162#endif
 163
 164        return ;
 165}
 166
 167static void boot_prep_linux(bootm_headers_t *images)
 168{
 169#ifdef CONFIG_MP
 170        /*
 171         * if we are MP make sure to flush the device tree so any changes are
 172         * made visibile to all other cores.  In AMP boot scenarios the cores
 173         * might not be HW cache coherent with each other.
 174         */
 175        flush_cache((unsigned long)images->ft_addr, images->ft_len);
 176#endif
 177}
 178
 179static int boot_cmdline_linux(bootm_headers_t *images)
 180{
 181        ulong of_size = images->ft_len;
 182        struct lmb *lmb = &images->lmb;
 183        ulong *cmd_start = &images->cmdline_start;
 184        ulong *cmd_end = &images->cmdline_end;
 185
 186        int ret = 0;
 187
 188        if (!of_size) {
 189                /* allocate space and init command line */
 190                ret = boot_get_cmdline (lmb, cmd_start, cmd_end);
 191                if (ret) {
 192                        puts("ERROR with allocation of cmdline\n");
 193                        return ret;
 194                }
 195        }
 196
 197        return ret;
 198}
 199
 200static int boot_bd_t_linux(bootm_headers_t *images)
 201{
 202        ulong of_size = images->ft_len;
 203        struct lmb *lmb = &images->lmb;
 204        struct bd_info **kbd = &images->kbd;
 205
 206        int ret = 0;
 207
 208        if (!of_size) {
 209                /* allocate space for kernel copy of board info */
 210                ret = boot_get_kbd (lmb, kbd);
 211                if (ret) {
 212                        puts("ERROR with allocation of kernel bd\n");
 213                        return ret;
 214                }
 215                set_clocks_in_mhz(*kbd);
 216        }
 217
 218        return ret;
 219}
 220
 221static int boot_body_linux(bootm_headers_t *images)
 222{
 223        int ret;
 224
 225        /* allocate space for kernel copy of board info */
 226        ret = boot_bd_t_linux(images);
 227        if (ret)
 228                return ret;
 229
 230        ret = image_setup_linux(images);
 231        if (ret)
 232                return ret;
 233
 234        return 0;
 235}
 236
 237noinline int do_bootm_linux(int flag, int argc, char *const argv[],
 238                            bootm_headers_t *images)
 239{
 240        int     ret;
 241
 242        if (flag & BOOTM_STATE_OS_CMDLINE) {
 243                boot_cmdline_linux(images);
 244                return 0;
 245        }
 246
 247        if (flag & BOOTM_STATE_OS_BD_T) {
 248                boot_bd_t_linux(images);
 249                return 0;
 250        }
 251
 252        if (flag & BOOTM_STATE_OS_PREP) {
 253                boot_prep_linux(images);
 254                return 0;
 255        }
 256
 257        boot_prep_linux(images);
 258        ret = boot_body_linux(images);
 259        if (ret)
 260                return ret;
 261        boot_jump_linux(images);
 262
 263        return 0;
 264}
 265
 266static ulong get_sp (void)
 267{
 268        ulong sp;
 269
 270        asm( "mr %0,1": "=r"(sp) : );
 271        return sp;
 272}
 273
 274static void set_clocks_in_mhz (struct bd_info *kbd)
 275{
 276        char    *s;
 277
 278        s = env_get("clocks_in_mhz");
 279        if (s) {
 280                /* convert all clock information to MHz */
 281                kbd->bi_intfreq /= 1000000L;
 282                kbd->bi_busfreq /= 1000000L;
 283#if defined(CONFIG_CPM2)
 284                kbd->bi_cpmfreq /= 1000000L;
 285                kbd->bi_brgfreq /= 1000000L;
 286                kbd->bi_sccfreq /= 1000000L;
 287                kbd->bi_vco     /= 1000000L;
 288#endif
 289        }
 290}
 291
 292#if defined(CONFIG_BOOTM_VXWORKS)
 293void boot_prep_vxworks(bootm_headers_t *images)
 294{
 295#if defined(CONFIG_OF_LIBFDT)
 296        int off;
 297        u64 base, size;
 298
 299        if (!images->ft_addr)
 300                return;
 301
 302        base = (u64)gd->ram_base;
 303        size = (u64)gd->ram_size;
 304
 305        off = fdt_path_offset(images->ft_addr, "/memory");
 306        if (off < 0)
 307                fdt_fixup_memory(images->ft_addr, base, size);
 308
 309#if defined(CONFIG_MP)
 310#if defined(CONFIG_MPC85xx)
 311        ft_fixup_cpu(images->ft_addr, base + size);
 312        ft_fixup_num_cores(images->ft_addr);
 313#elif defined(CONFIG_MPC86xx)
 314        off = fdt_add_mem_rsv(images->ft_addr,
 315                        determine_mp_bootpg(NULL), (u64)4096);
 316        if (off < 0)
 317                printf("## WARNING %s: %s\n", __func__, fdt_strerror(off));
 318        ft_fixup_num_cores(images->ft_addr);
 319#endif
 320        flush_cache((unsigned long)images->ft_addr, images->ft_len);
 321#endif
 322#endif
 323}
 324
 325void boot_jump_vxworks(bootm_headers_t *images)
 326{
 327        /* PowerPC VxWorks boot interface conforms to the ePAPR standard
 328         * general purpuse registers:
 329         *
 330         *      r3: Effective address of the device tree image
 331         *      r4: 0
 332         *      r5: 0
 333         *      r6: ePAPR magic value
 334         *      r7: shall be the size of the boot IMA in bytes
 335         *      r8: 0
 336         *      r9: 0
 337         *      TCR: WRC = 0, no watchdog timer reset will occur
 338         */
 339        WATCHDOG_RESET();
 340
 341        ((void (*)(void *, ulong, ulong, ulong,
 342                ulong, ulong, ulong))images->ep)(images->ft_addr,
 343                0, 0, EPAPR_MAGIC, env_get_bootm_mapsize(), 0, 0);
 344}
 345#endif
 346