2009-04-13 07:02:46 +00:00
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/* crt0.S - Startup code for the Sparc64. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/symbol.h>
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#include <grub/machine/kernel.h>
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.text
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.align 4
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.globl _start
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_start:
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ba codestart
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nop
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. = EXT_C(_start) + GRUB_KERNEL_MACHINE_TOTAL_MODULE_SIZE
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VARIABLE(grub_total_module_size)
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.word 0
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VARIABLE(grub_kernel_image_size)
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.word 0
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VARIABLE(grub_compressed_size)
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.word 0
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VARIABLE(grub_prefix)
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/* to be filled by grub-mkimage */
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/*
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* Leave some breathing room for the prefix.
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*/
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. = EXT_C(_start) + GRUB_KERNEL_MACHINE_DATA_END
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codestart:
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/* Copy the modules past the end of the kernel image.
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* They are currently sitting in the BSS.
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*/
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sethi %hi(__bss_start), %o2
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or %o2, %lo(__bss_start), %o2
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sethi %hi(_end), %o3
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or %o3, %lo(_end), %o3
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sethi %hi(grub_total_module_size), %o4
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lduw [%o4 + %lo(grub_total_module_size)], %o4
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2010-02-13 15:23:20 +00:00
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add %o2, %o4, %o2
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add %o3, %o4, %o3
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sub %o2, 4, %o2
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sub %o3, 4, %o3
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2009-04-13 07:02:46 +00:00
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1: lduw [%o2], %o5
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stw %o5, [%o3]
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subcc %o4, 4, %o4
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2010-02-13 15:23:20 +00:00
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sub %o2, 4, %o2
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2009-04-13 07:02:46 +00:00
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bne,pt %icc, 1b
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2010-02-13 15:23:20 +00:00
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sub %o3, 4, %o3
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2009-04-13 07:02:46 +00:00
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/* Now it's safe to clear out the BSS. */
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sethi %hi(__bss_start), %o2
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or %o2, %lo(__bss_start), %o2
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sethi %hi(_end), %o3
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or %o3, %lo(_end), %o3
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1: stx %g0, [%o2]
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add %o2, 8, %o2
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cmp %o2, %o3
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blt,pt %xcc, 1b
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nop
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sethi %hi(grub_ieee1275_entry_fn), %o2
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stx %o0, [%o2 + %lo(grub_ieee1275_entry_fn)]
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call grub_main
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nop
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1: ba,a 1b
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