diff options
Diffstat (limited to 'grub-core/kern/sparc64/ieee1275/crt0.S')
| -rw-r--r-- | grub-core/kern/sparc64/ieee1275/crt0.S | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/grub-core/kern/sparc64/ieee1275/crt0.S b/grub-core/kern/sparc64/ieee1275/crt0.S new file mode 100644 index 0000000..03b916f --- /dev/null +++ b/grub-core/kern/sparc64/ieee1275/crt0.S @@ -0,0 +1,104 @@ +/* crt0.S - Startup code for the Sparc64. */ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 2009 Free Software Foundation, Inc. + * + * GRUB is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * GRUB is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with GRUB. If not, see <http://www.gnu.org/licenses/>. + */ +#include <grub/symbol.h> +#include <grub/machine/kernel.h> +#include <grub/offsets.h> + + .text + .align 4 + .globl _start +_start: + ba codestart + mov %o4, %o0 + + .org GRUB_KERNEL_MACHINE_TOTAL_MODULE_SIZE + +VARIABLE(grub_total_module_size) + .word 0 + +codestart: + /* Copy the modules past the end of the kernel image. + * They are currently sitting in the BSS. + */ + sethi %hi(__bss_start + GRUB_KERNEL_SPARC64_IEEE1275_MOD_ALIGN - 1), %o2 + or %o2, %lo(__bss_start + GRUB_KERNEL_SPARC64_IEEE1275_MOD_ALIGN - 1), %o2 + srl %o2, GRUB_KERNEL_SPARC64_IEEE1275_LOG_MOD_ALIGN, %o2 + sll %o2, GRUB_KERNEL_SPARC64_IEEE1275_LOG_MOD_ALIGN, %o2 + sethi %hi(_end + GRUB_KERNEL_SPARC64_IEEE1275_MOD_ALIGN - 1), %o3 + or %o3, %lo(_end + GRUB_KERNEL_SPARC64_IEEE1275_MOD_ALIGN - 1), %o3 + srl %o3, GRUB_KERNEL_SPARC64_IEEE1275_LOG_MOD_ALIGN, %o3 + sll %o3, GRUB_KERNEL_SPARC64_IEEE1275_LOG_MOD_ALIGN, %o3 + sethi %hi(grub_total_module_size), %o4 + lduw [%o4 + %lo(grub_total_module_size)], %o4 + + add %o2, %o4, %o2 + add %o3, %o4, %o3 + + /* Save ieee1275 stack for future use by booter. */ + mov %o6, %o1 + /* Our future stack. */ + sethi %hi(GRUB_KERNEL_MACHINE_STACK_SIZE), %o5 + or %o5, %lo(GRUB_KERNEL_MACHINE_STACK_SIZE), %o5 + add %o3, %o5, %o6 + and %o6, ~0xff, %o6 + sub %o6, 2047, %o6 + + sub %o2, 4, %o2 + sub %o3, 4, %o3 +1: lduw [%o2], %o5 + stw %o5, [%o3] + subcc %o4, 4, %o4 + sub %o2, 4, %o2 + bne,pt %icc, 1b + sub %o3, 4, %o3 + + /* Now it's safe to clear out the BSS. */ + sethi %hi(__bss_start), %o2 + or %o2, %lo(__bss_start), %o2 +1: stb %g0, [%o2] + add %o2, 1, %o2 + and %o2, 7, %o3 + brnz %o3, 1b + nop + + sethi %hi(_end - 1), %o3 + or %o3, %lo(_end - 1), %o3 + srl %o3, 3, %o3 + sll %o3, 3, %o3 +1: stx %g0, [%o2] + add %o2, 8, %o2 + cmp %o2, %o3 + blt,pt %xcc, 1b + nop + + sethi %hi(_end), %o3 + or %o3, %lo(_end), %o3 +1: stb %g0, [%o2] + add %o2, 1, %o2 + cmp %o2, %o3 + blt,pt %xcc, 1b + nop + + sethi %hi(grub_ieee1275_original_stack), %o2 + stx %o1, [%o2 + %lo(grub_ieee1275_original_stack)] + sethi %hi(grub_ieee1275_entry_fn), %o2 + call grub_main + stx %o0, [%o2 + %lo(grub_ieee1275_entry_fn)] +1: ba,a 1b + nop |