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Diffstat (limited to 'bsps/sparc64/shared/start/start.S')
| -rw-r--r-- | bsps/sparc64/shared/start/start.S | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/bsps/sparc64/shared/start/start.S b/bsps/sparc64/shared/start/start.S new file mode 100644 index 0000000000..92c2177c1e --- /dev/null +++ b/bsps/sparc64/shared/start/start.S @@ -0,0 +1,151 @@ +# +# Copyright (c) 2006 Martin Decky +# Copyright (c) 2006 Jakub Jermar +# All rights reserved. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions +# are met: +# +# - Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# - Redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in the +# documentation and/or other materials provided with the distribution. +# - The name of the author may not be used to endorse or promote products +# derived from this software without specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR +# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES +# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. +# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, +# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT +# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF +# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +# + +/* + * start.S + * + * Start code for Sparc64 RTEMS + * + * This is based on the boot.S file of the HelenOS sparc64 architecture. + * http://www.helenos.org/ + * ${helenos}/boot/arch/sparc64/loader/boot.S + * + * Modifications for the RTEMS executive are + * COPYRIGHT (c) 2010 Gedare Bloom. + * COPYRIGHT (c) 2010 Eugen Leontie. + */ + +#include <rtems/asm.h> +#include <rtems/score/cpu.h> + +#define PSTATE_PRIV_BIT 4 + +.register %g2, #scratch +.register %g3, #scratch +.register %g6, #scratch +.register %g7, #scratch + +.section BOOTSTRAP, "ax" + +PUBLIC(_start) + .global _start + SYM(_start): + start: + b 1f + nop + + /* + * This header forces SILO to load the image at 0x4000. + * More precisely, SILO will think this is an old version of Linux. + */ + .ascii "HdrS" + .word 0 + .half 0 + .half 0 + .half 0 + .half 0 + .global silo_ramdisk_image + silo_ramdisk_image: + .word 0 + .global silo_ramdisk_size + silo_ramdisk_size: + .word 0 + + .align 8 + 1: + /* + * Disable interrupts and disable address masking. + */ + wrpr %g0, PSTATE_PRIV_BIT, %pstate + + wrpr %g0, SPARC_NUMBER_OF_REGISTER_WINDOWS - 2, %cansave ! set maximum saveable windows + wrpr %g0, 0, %canrestore ! get rid of windows we will never need again + wrpr %g0, 0, %otherwin ! make sure the window state is consistent + wrpr %g0, SPARC_NUMBER_OF_REGISTER_WINDOWS - 1, %cleanwin ! prevent needless clean_window traps for kernel + + /* g4 needs to be cleared for gcc */ + mov %g0, %g4 + + /* Clear the bss */ + setx SYM(bss_start), %l0, %g2 ! g2 = start of bss + setx SYM(_end), %l0, %g3 ! g3 = end of bss +zerobss: + stx %g0, [%g2] + add %g2, 8, %g2 + cmp %g2, %g3 + bleu,a zerobss + nop + + /* Install stack */ +setstack: + set SYM(StackStart), %sp + add %sp, -STACK_BIAS, %sp + + /* BSP-specific pre-bootcard initializations */ + call SYM(_BSP_init) + nop + + setx ofw_cif, %l0, %l1 + + call ofw_init ! initialize OpenFirmware + stx %o4, [%l1] + + call bootstrap + nop + + + /* Set up ISR handler for interrupt enable/disable */ + setx SYM(syscall), %l0, %o1 + setx param_space, %l0, %o2 + call SYM(_CPU_ISR_install_raw_handler) + mov 0x100, %o0 + + /* Don't need to copy initialized data to RAM--link puts all in RAM already */ + + mov %g0, %o0 ! clear command line passed to main + call SYM(boot_card) + sub %sp, 0x60, %sp ! make room on stack (necessary?) + + call SYM(halt) + nop + +halted: nop + b SYM(halted) + +.section BOOTSTRAP + .align CPU_ALIGNMENT + .space 32768 - SPARC64_MINIMUM_STACK_FRAME_SIZE ! 32K boot stack grows down + .global StackStart + StackStart: + .space SPARC64_MINIMUM_STACK_FRAME_SIZE ! initial stack frame + +.section BOOTSTRAP + .align CPU_ALIGNMENT + param_space: + .space 8 |