diff options
Diffstat (limited to 'common/image.c')
| -rw-r--r-- | common/image.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/common/image.c b/common/image.c index e4be4ca..56d6b52 100644 --- a/common/image.c +++ b/common/image.c @@ -22,6 +22,9 @@ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ + +#define DEBUG + #ifndef USE_HOSTCC #include <common.h> #include <watchdog.h> @@ -34,6 +37,10 @@ #include <dataflash.h> #endif +#ifdef CONFIG_LOGBUFFER +#include <logbuff.h> +#endif + extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]); #else #include "mkimage.h" @@ -476,5 +483,111 @@ void get_ramdisk (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[], debug (" ramdisk start = 0x%08lx, ramdisk end = 0x%08lx\n", *rd_start, *rd_end); } + +#if defined(CONFIG_PPC) || defined(CONFIG_M68K) +/** + * ramdisk_high - relocate init ramdisk + * @rd_data: ramdisk data start address + * @rd_len: ramdisk data length + * @kbd: kernel board info copy (within BOOTMAPSZ boundary) + * @sp_limit: stack pointer limit (including BOOTMAPSZ) + * @sp: current stack pointer + * @initrd_start: pointer to a ulong variable, will hold final init ramdisk + * start address (after possible relocation) + * @initrd_end: pointer to a ulong variable, will hold final init ramdisk + * end address (after possible relocation) + * + * ramdisk_high() takes a relocation hint from "initrd_high" environement + * variable and if requested ramdisk data is moved to a specified location. + * + * returns: + * initrd_start and initrd_end are set to final (after relocation) ramdisk + * start/end addresses if ramdisk image start and len were provided + * otherwise set initrd_start and initrd_end to zeros + * + */ +void ramdisk_high (ulong rd_data, ulong rd_len, bd_t *kbd, ulong sp_limit, + ulong sp, ulong *initrd_start, ulong *initrd_end) +{ + char *s; + ulong initrd_high; + int initrd_copy_to_ram = 1; + + if ((s = getenv ("initrd_high")) != NULL) { + /* a value of "no" or a similar string will act like 0, + * turning the "load high" feature off. This is intentional. + */ + initrd_high = simple_strtoul (s, NULL, 16); + if (initrd_high == ~0) + initrd_copy_to_ram = 0; + } else { + /* not set, no restrictions to load high */ + initrd_high = ~0; + } + +#ifdef CONFIG_LOGBUFFER + /* Prevent initrd from overwriting logbuffer */ + if (initrd_high < (kbd->bi_memsize - LOGBUFF_LEN - LOGBUFF_OVERHEAD)) + initrd_high = kbd->bi_memsize - LOGBUFF_LEN - LOGBUFF_OVERHEAD; + debug ("## Logbuffer at 0x%08lx ", kbd->bi_memsize - LOGBUFF_LEN); +#endif + debug ("## initrd_high = 0x%08lx, copy_to_ram = %d\n", + initrd_high, initrd_copy_to_ram); + + if (rd_data) { + if (!initrd_copy_to_ram) { /* zero-copy ramdisk support */ + debug (" in-place initrd\n"); + *initrd_start = rd_data; + *initrd_end = rd_data + rd_len; + } else { + *initrd_start = (ulong)kbd - rd_len; + *initrd_start &= ~(4096 - 1); /* align on page */ + + if (initrd_high) { + ulong nsp; + + /* + * the inital ramdisk does not need to be within + * CFG_BOOTMAPSZ as it is not accessed until after + * the mm system is initialised. + * + * do the stack bottom calculation again and see if + * the initrd will fit just below the monitor stack + * bottom without overwriting the area allocated + * for command line args and board info. + */ + nsp = sp; + nsp -= 2048; /* just to be sure */ + nsp &= ~0xF; + + if (nsp > initrd_high) /* limit as specified */ + nsp = initrd_high; + + nsp -= rd_len; + nsp &= ~(4096 - 1); /* align on page */ + + if (nsp >= sp_limit) + *initrd_start = nsp; + } + + show_boot_progress (12); + + *initrd_end = *initrd_start + rd_len; + printf (" Loading Ramdisk to %08lx, end %08lx ... ", + *initrd_start, *initrd_end); + + memmove_wd((void *)*initrd_start, + (void *)rd_data, rd_len, CHUNKSZ); + + puts ("OK\n"); + } + } else { + *initrd_start = 0; + *initrd_end = 0; + } + debug (" ramdisk load start = 0x%08lx, ramdisk load end = 0x%08lx\n", + *initrd_start, *initrd_end); +} +#endif /* CONFIG_PPC || CONFIG_M68K */ #endif /* USE_HOSTCC */ |