diff options
Diffstat (limited to 'arch/i386/lib/board.c')
| -rw-r--r-- | arch/i386/lib/board.c | 117 |
1 files changed, 54 insertions, 63 deletions
diff --git a/arch/i386/lib/board.c b/arch/i386/lib/board.c index 5002203ec..1129918fe 100644 --- a/arch/i386/lib/board.c +++ b/arch/i386/lib/board.c @@ -48,13 +48,12 @@ DECLARE_GLOBAL_DATA_PTR; /* Exports from the Linker Script */ -extern ulong _i386boot_text_start; -extern ulong _i386boot_rel_dyn_start; -extern ulong _i386boot_rel_dyn_end; -extern ulong _i386boot_bss_start; -extern ulong _i386boot_bss_size; - -void ram_bootstrap (void *, ulong); +extern ulong __text_start; +extern ulong __data_end; +extern ulong __rel_dyn_start; +extern ulong __rel_dyn_end; +extern ulong __bss_start; +extern ulong __bss_end; const char version_string[] = U_BOOT_VERSION" (" U_BOOT_DATE " - " U_BOOT_TIME ")"; @@ -164,85 +163,77 @@ init_fnc_t *init_sequence[] = { NULL, }; -static gd_t gd_data; gd_t *gd; /* * Load U-Boot into RAM, initialize BSS, perform relocation adjustments */ -void board_init_f (ulong stack_limit) +void board_init_f (ulong gdp) { - void *text_start = &_i386boot_text_start; - void *u_boot_cmd_end = &__u_boot_cmd_end; - Elf32_Rel *rel_dyn_start = (Elf32_Rel *)&_i386boot_rel_dyn_start; - Elf32_Rel *rel_dyn_end = (Elf32_Rel *)&_i386boot_rel_dyn_end; - void *bss_start = &_i386boot_bss_start; - ulong bss_size = (ulong)&_i386boot_bss_size; + void *text_start = &__text_start; + void *data_end = &__data_end; + void *rel_dyn_start = &__rel_dyn_start; + void *rel_dyn_end = &__rel_dyn_end; + void *bss_start = &__bss_start; + void *bss_end = &__bss_end; + + ulong *dst_addr; + ulong *src_addr; + ulong *end_addr; - ulong uboot_size; void *dest_addr; ulong rel_offset; - Elf32_Rel *re; - - void (*start_func)(void *, ulong); + Elf32_Rel *re_src; + Elf32_Rel *re_end; - uboot_size = (ulong)u_boot_cmd_end - (ulong)text_start; - dest_addr = (void *)stack_limit - (uboot_size + (ulong)bss_size); + /* Calculate destination RAM Address and relocation offset */ + dest_addr = (void *)gdp - (bss_end - text_start); rel_offset = text_start - dest_addr; - start_func = ram_bootstrap - rel_offset; - /* First stage CPU initialization */ - if (cpu_init_f() != 0) - hang(); + /* Perform low-level initialization only when cold booted */ + if (((gd_t *)gdp)->flags & GD_FLG_COLD_BOOT) { + /* First stage CPU initialization */ + if (cpu_init_f() != 0) + hang(); - /* First stage Board initialization */ - if (board_early_init_f() != 0) - hang(); + /* First stage Board initialization */ + if (board_early_init_f() != 0) + hang(); + } /* Copy U-Boot into RAM */ - memcpy(dest_addr, text_start, uboot_size); + dst_addr = (ulong *)dest_addr; + src_addr = (ulong *)(text_start + ((gd_t *)gdp)->load_off); + end_addr = (ulong *)(data_end + ((gd_t *)gdp)->load_off); + + while (src_addr < end_addr) + *dst_addr++ = *src_addr++; /* Clear BSS */ - memset(bss_start - rel_offset, 0, bss_size); + dst_addr = (ulong *)(bss_start - rel_offset); + end_addr = (ulong *)(bss_end - rel_offset); + + while (dst_addr < end_addr) + *dst_addr++ = 0x00000000; /* Perform relocation adjustments */ - for (re = rel_dyn_start; re < rel_dyn_end; re++) - { - if (re->r_offset >= TEXT_BASE) - if (*(ulong *)re->r_offset >= TEXT_BASE) - *(ulong *)(re->r_offset - rel_offset) -= (Elf32_Addr)rel_offset; - } + re_src = (Elf32_Rel *)(rel_dyn_start + ((gd_t *)gdp)->load_off); + re_end = (Elf32_Rel *)(rel_dyn_end + ((gd_t *)gdp)->load_off); - /* Enter the relocated U-Boot! */ - start_func(dest_addr, rel_offset); - /* NOTREACHED - board_init_f() does not return */ - while(1); -} + do { + if (re_src->r_offset >= TEXT_BASE) + if (*(Elf32_Addr *)(re_src->r_offset - rel_offset) >= TEXT_BASE) + *(Elf32_Addr *)(re_src->r_offset - rel_offset) -= rel_offset; + } while (re_src++ < re_end); -/* - * We cannot initialize gd_data in board_init_f() because we would be - * attempting to write to flash (I have even tried using manual relocation - * adjustments on pointers but it just won't work) and board_init_r() does - * not have enough arguments to allow us to pass the relocation offset - * straight up. This bootstrap function (which runs in RAM) is used to - * setup gd_data in order to pass the relocation offset to the rest of - * U-Boot. - * - * TODO: The compiler optimization barrier is intended to stop GCC from - * optimizing this function into board_init_f(). It seems to work without - * it, but I've left it in to be sure. I think also that the barrier in - * board_init_r() is no longer needed, but left it in 'just in case' - */ -void ram_bootstrap (void *dest_addr, ulong rel_offset) -{ - /* compiler optimization barrier needed for GCC >= 3.4 */ - __asm__ __volatile__("": : :"memory"); + ((gd_t *)gdp)->reloc_off = rel_offset; + ((gd_t *)gdp)->flags |= GD_FLG_RELOC; - /* tell others: relocation done */ - gd_data.reloc_off = rel_offset; - gd_data.flags |= GD_FLG_RELOC; + /* Enter the relocated U-Boot! */ + (board_init_r - rel_offset)((gd_t *)gdp, (ulong)dest_addr); - board_init_r(&gd_data, (ulong)dest_addr); + /* NOTREACHED - board_init_f() does not return */ + while(1); } void board_init_r(gd_t *id, ulong dest_addr) |