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| author | Graeme Russ <graeme.russ@gmail.com> | 2011-02-12 15:11:50 +1100 |
|---|---|---|
| committer | Graeme Russ <graeme.russ@gmail.com> | 2011-02-12 15:11:50 +1100 |
| commit | 2e2613d2c4755426cb6bfddf1ca7714b0deec177 (patch) | |
| tree | 7430db819968e9b01c5dbb486f5e88e5367a355e /arch/i386/lib | |
| parent | cfbe861506e2dc3250ac99dc45bb3d1ac60f4857 (diff) | |
| download | u-boot-imx-2e2613d2c4755426cb6bfddf1ca7714b0deec177.zip u-boot-imx-2e2613d2c4755426cb6bfddf1ca7714b0deec177.tar.gz u-boot-imx-2e2613d2c4755426cb6bfddf1ca7714b0deec177.tar.bz2 | |
x86: Move initial gd to fixed location
Diffstat (limited to 'arch/i386/lib')
| -rw-r--r-- | arch/i386/lib/board.c | 36 |
1 files changed, 24 insertions, 12 deletions
diff --git a/arch/i386/lib/board.c b/arch/i386/lib/board.c index 2cadce8..4227312 100644 --- a/arch/i386/lib/board.c +++ b/arch/i386/lib/board.c @@ -45,7 +45,15 @@ #include <miiphy.h> #endif -DECLARE_GLOBAL_DATA_PTR; +/* + * Pointer to initial global data area + * + * Here we initialize it. + */ +#undef XTRN_DECLARE_GLOBAL_DATA_PTR +#define XTRN_DECLARE_GLOBAL_DATA_PTR /* empty = allocate here */ +DECLARE_GLOBAL_DATA_PTR = (gd_t *) (CONFIG_SYS_INIT_GD_ADDR); + /* Exports from the Linker Script */ extern ulong __text_start; @@ -168,7 +176,7 @@ gd_t *gd; /* * Load U-Boot into RAM, initialize BSS, perform relocation adjustments */ -void board_init_f (ulong gdp) +void board_init_f(ulong mem_top) { void *text_start = &__text_start; void *data_end = &__data_end; @@ -187,11 +195,11 @@ void board_init_f (ulong gdp) Elf32_Rel *re_end; /* Calculate destination RAM Address and relocation offset */ - dest_addr = (void *)gdp - (bss_end - text_start); + dest_addr = (void *)mem_top - (bss_end - text_start); rel_offset = text_start - dest_addr; /* Perform low-level initialization only when cold booted */ - if (((gd_t *)gdp)->flags & GD_FLG_COLD_BOOT) { + if (gd->flags & GD_FLG_COLD_BOOT) { /* First stage CPU initialization */ if (cpu_init_f() != 0) hang(); @@ -203,8 +211,8 @@ void board_init_f (ulong gdp) /* Copy U-Boot into RAM */ 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); + src_addr = (ulong *)(text_start + gd->load_off); + end_addr = (ulong *)(data_end + gd->load_off); while (src_addr < end_addr) *dst_addr++ = *src_addr++; @@ -217,8 +225,8 @@ void board_init_f (ulong gdp) *dst_addr++ = 0x00000000; /* Perform relocation adjustments */ - re_src = (Elf32_Rel *)(rel_dyn_start + ((gd_t *)gdp)->load_off); - re_end = (Elf32_Rel *)(rel_dyn_end + ((gd_t *)gdp)->load_off); + re_src = (Elf32_Rel *)(rel_dyn_start + gd->load_off); + re_end = (Elf32_Rel *)(rel_dyn_end + gd->load_off); do { if (re_src->r_offset >= CONFIG_SYS_TEXT_BASE) @@ -226,11 +234,11 @@ void board_init_f (ulong gdp) *(Elf32_Addr *)(re_src->r_offset - rel_offset) -= rel_offset; } while (re_src++ < re_end); - ((gd_t *)gdp)->reloc_off = rel_offset; - ((gd_t *)gdp)->flags |= GD_FLG_RELOC; + gd->reloc_off = rel_offset; + gd->flags |= GD_FLG_RELOC; /* Enter the relocated U-Boot! */ - (board_init_r - rel_offset)((gd_t *)gdp, (ulong)dest_addr); + (board_init_r - rel_offset)(gd, (ulong)dest_addr); /* NOTREACHED - board_init_f() does not return */ while(1); @@ -242,11 +250,15 @@ void board_init_r(gd_t *id, ulong dest_addr) int i; ulong size; static bd_t bd_data; + static gd_t gd_data; init_fnc_t **init_fnc_ptr; show_boot_progress(0x21); - gd = id; + /* Global data pointer is now writable */ + gd = &gd_data; + memcpy(gd, id, sizeof(gd_t)); + /* compiler optimization barrier needed for GCC >= 3.4 */ __asm__ __volatile__("": : :"memory"); |