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 CFG_SYS_LINUX_LOWMEM_MAX_SIZE
  45#define CFG_SYS_LINUX_LOWMEM_MAX_SIZE   (768*1024*1024)
  46#endif
  47
  48static void boot_jump_linux(struct bootm_headers *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                schedule();
  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                schedule();
 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, 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            (CFG_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)CFG_SYS_LINUX_LOWMEM_MAX_SIZE);
 137
 138        if (size < bootm_size) {
 139                ulong base = bootmap_base + size;
 140                printf("WARNING: adjusting available memory from 0x%lx to 0x%llx\n",
 141                       size, (unsigned long long)bootm_size);
 142                lmb_reserve(lmb, base, bootm_size - size);
 143        }
 144
 145        arch_lmb_reserve_generic(lmb, get_sp(), gd->ram_top, 4096);
 146
 147#ifdef CONFIG_MP
 148        cpu_mp_lmb_reserve(lmb);
 149#endif
 150
 151        return;
 152}
 153
 154static void boot_prep_linux(struct bootm_headers *images)
 155{
 156#ifdef CONFIG_MP
 157        /*
 158         * if we are MP make sure to flush the device tree so any changes are
 159         * made visibile to all other cores.  In AMP boot scenarios the cores
 160         * might not be HW cache coherent with each other.
 161         */
 162        flush_cache((unsigned long)images->ft_addr, images->ft_len);
 163#endif
 164}
 165
 166static int boot_cmdline_linux(struct bootm_headers *images)
 167{
 168        ulong of_size = images->ft_len;
 169        struct lmb *lmb = &images->lmb;
 170        ulong *cmd_start = &images->cmdline_start;
 171        ulong *cmd_end = &images->cmdline_end;
 172
 173        int ret = 0;
 174
 175        if (!of_size) {
 176                /* allocate space and init command line */
 177                ret = boot_get_cmdline (lmb, cmd_start, cmd_end);
 178                if (ret) {
 179                        puts("ERROR with allocation of cmdline\n");
 180                        return ret;
 181                }
 182        }
 183
 184        return ret;
 185}
 186
 187static int boot_bd_t_linux(struct bootm_headers *images)
 188{
 189        ulong of_size = images->ft_len;
 190        struct lmb *lmb = &images->lmb;
 191        struct bd_info **kbd = &images->kbd;
 192
 193        int ret = 0;
 194
 195        if (!of_size) {
 196                /* allocate space for kernel copy of board info */
 197                ret = boot_get_kbd (lmb, kbd);
 198                if (ret) {
 199                        puts("ERROR with allocation of kernel bd\n");
 200                        return ret;
 201                }
 202                set_clocks_in_mhz(*kbd);
 203        }
 204
 205        return ret;
 206}
 207
 208static int boot_body_linux(struct bootm_headers *images)
 209{
 210        int ret;
 211
 212        /* allocate space for kernel copy of board info */
 213        ret = boot_bd_t_linux(images);
 214        if (ret)
 215                return ret;
 216
 217        if (IS_ENABLED(CONFIG_LMB)) {
 218                ret = image_setup_linux(images);
 219                if (ret)
 220                        return ret;
 221        }
 222
 223        return 0;
 224}
 225
 226noinline int do_bootm_linux(int flag, int argc, char *const argv[],
 227                            struct bootm_headers *images)
 228{
 229        int     ret;
 230
 231        if (flag & BOOTM_STATE_OS_CMDLINE) {
 232                boot_cmdline_linux(images);
 233                return 0;
 234        }
 235
 236        if (flag & BOOTM_STATE_OS_BD_T) {
 237                boot_bd_t_linux(images);
 238                return 0;
 239        }
 240
 241        if (flag & BOOTM_STATE_OS_PREP) {
 242                boot_prep_linux(images);
 243                return 0;
 244        }
 245
 246        boot_prep_linux(images);
 247        ret = boot_body_linux(images);
 248        if (ret)
 249                return ret;
 250        boot_jump_linux(images);
 251
 252        return 0;
 253}
 254
 255static ulong get_sp (void)
 256{
 257        ulong sp;
 258
 259        asm( "mr %0,1": "=r"(sp) : );
 260        return sp;
 261}
 262
 263static void set_clocks_in_mhz (struct bd_info *kbd)
 264{
 265        char    *s;
 266
 267        s = env_get("clocks_in_mhz");
 268        if (s) {
 269                /* convert all clock information to MHz */
 270                kbd->bi_intfreq /= 1000000L;
 271                kbd->bi_busfreq /= 1000000L;
 272        }
 273}
 274
 275#if defined(CONFIG_BOOTM_VXWORKS)
 276void boot_prep_vxworks(struct bootm_headers *images)
 277{
 278#if defined(CONFIG_OF_LIBFDT)
 279        int off;
 280        u64 base, size;
 281
 282        if (!images->ft_addr)
 283                return;
 284
 285        base = (u64)gd->ram_base;
 286        size = (u64)gd->ram_size;
 287
 288        off = fdt_path_offset(images->ft_addr, "/memory");
 289        if (off < 0)
 290                fdt_fixup_memory(images->ft_addr, base, size);
 291
 292#if defined(CONFIG_MP)
 293#if defined(CONFIG_MPC85xx)
 294        ft_fixup_cpu(images->ft_addr, base + size);
 295        ft_fixup_num_cores(images->ft_addr);
 296#elif defined(CONFIG_MPC86xx)
 297        off = fdt_add_mem_rsv(images->ft_addr,
 298                        determine_mp_bootpg(NULL), (u64)4096);
 299        if (off < 0)
 300                printf("## WARNING %s: %s\n", __func__, fdt_strerror(off));
 301        ft_fixup_num_cores(images->ft_addr);
 302#endif
 303        flush_cache((unsigned long)images->ft_addr, images->ft_len);
 304#endif
 305#endif
 306}
 307
 308void boot_jump_vxworks(struct bootm_headers *images)
 309{
 310        /* PowerPC VxWorks boot interface conforms to the ePAPR standard
 311         * general purpuse registers:
 312         *
 313         *      r3: Effective address of the device tree image
 314         *      r4: 0
 315         *      r5: 0
 316         *      r6: ePAPR magic value
 317         *      r7: shall be the size of the boot IMA in bytes
 318         *      r8: 0
 319         *      r9: 0
 320         *      TCR: WRC = 0, no watchdog timer reset will occur
 321         */
 322        schedule();
 323
 324        ((void (*)(void *, ulong, ulong, ulong,
 325                ulong, ulong, ulong))images->ep)(images->ft_addr,
 326                0, 0, EPAPR_MAGIC, env_get_bootm_mapsize(), 0, 0);
 327}
 328#endif
 329