linux/arch/alpha/kernel/head.S
Tim Abbott 92ca52343c alpha: convert to use __HEAD and HEAD_TEXT macros.
This has the consequence of changing the section name use for head
code from ".text.head" to ".head.text".  Since this commit changes all
users in the architecture, this change should be harmless.

Signed-off-by: Tim Abbott <tabbott@mit.edu>
Cc: Richard Henderson <rth@twiddle.net>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-04-26 09:20:38 -07:00

100 lines
2.1 KiB
ArmAsm

/*
* arch/alpha/kernel/head.S
*
* initial boot stuff.. At this point, the bootloader has already
* switched into OSF/1 PAL-code, and loaded us at the correct address
* (START_ADDR). So there isn't much left for us to do: just set up
* the kernel global pointer and jump to the kernel entry-point.
*/
#include <linux/init.h>
#include <asm/system.h>
#include <asm/asm-offsets.h>
__HEAD
.globl swapper_pg_dir
.globl _stext
swapper_pg_dir=SWAPPER_PGD
.set noreorder
.globl __start
.ent __start
_stext:
__start:
.prologue 0
br $27,1f
1: ldgp $29,0($27)
/* We need to get current_task_info loaded up... */
lda $8,init_thread_union
/* ... and find our stack ... */
lda $30,0x4000 - SIZEOF_PT_REGS($8)
/* ... and then we can start the kernel. */
jsr $26,start_kernel
call_pal PAL_halt
.end __start
#ifdef CONFIG_SMP
.align 3
.globl __smp_callin
.ent __smp_callin
/* On entry here from SRM console, the HWPCB of the per-cpu
slot for this processor has been loaded. We've arranged
for the UNIQUE value for this process to contain the PCBB
of the target idle task. */
__smp_callin:
.prologue 1
ldgp $29,0($27) # First order of business, load the GP.
call_pal PAL_rduniq # Grab the target PCBB.
mov $0,$16 # Install it.
call_pal PAL_swpctx
lda $8,0x3fff # Find "current".
bic $30,$8,$8
jsr $26,smp_callin
call_pal PAL_halt
.end __smp_callin
#endif /* CONFIG_SMP */
#
# The following two functions are needed for supporting SRM PALcode
# on the PC164 (at least), since that PALcode manages the interrupt
# masking, and we cannot duplicate the effort without causing problems
#
.align 3
.globl cserve_ena
.ent cserve_ena
cserve_ena:
.prologue 0
bis $16,$16,$17
lda $16,52($31)
call_pal PAL_cserve
ret ($26)
.end cserve_ena
.align 3
.globl cserve_dis
.ent cserve_dis
cserve_dis:
.prologue 0
bis $16,$16,$17
lda $16,53($31)
call_pal PAL_cserve
ret ($26)
.end cserve_dis
#
# It is handy, on occasion, to make halt actually just loop.
# Putting it here means we dont have to recompile the whole
# kernel.
#
.align 3
.globl halt
.ent halt
halt:
.prologue 0
call_pal PAL_halt
.end halt