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sparc32: always define boot_cpu_id

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Define boot_cpu_id in single-processor kernels as well. This is
to support architectures which can boot on other than CPU0.

Sam Ravnborg has written the cleanup parts by extracting
boot_cpu_id from smp_32.c into setup_32.c and cleaned up
sun4d_irq.c.

boot_cpu_id was initialized before BSS was cleared in
sun4c_continue_boot, instead boot_cpu_id is set to 0xff to
avoid BSS. If boot_cpu_id is untouched (0xff) by bootup code
it will be overwritten to 0. boot_cpu_id4 is automatically
calculated in common code.

Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Hellstrom
2011-04-21 04:20:23 +00:00
committed by David S. Miller
parent 1827237065
commit 5fcafb7a23
5 changed files with 35 additions and 14 deletions
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26
arch/sparc/kernel/head_32.S
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@@ -816,10 +816,7 @@ got_prop:
.global leon_smp_init
leon_smp_init:
sethi %hi(boot_cpu_id), %g1 ! master always 0
stb %g0, [%g1 + %lo(boot_cpu_id)]
sethi %hi(boot_cpu_id4), %g1 ! master always 0
stb %g0, [%g1 + %lo(boot_cpu_id4)]
/* let boot_cpu_id default to 0 (master always 0) */
rd %asr17,%g1
srl %g1,28,%g1
@@ -893,9 +890,6 @@ sun4d_init:
sta %g4, [%g0] ASI_M_VIKING_TMP1
sethi %hi(boot_cpu_id), %g5
stb %g4, [%g5 + %lo(boot_cpu_id)]
sll %g4, 2, %g4
sethi %hi(boot_cpu_id4), %g5
stb %g4, [%g5 + %lo(boot_cpu_id4)]
#endif
/* Fall through to sun4m_init */
@@ -1024,14 +1018,28 @@ sun4c_continue_boot:
bl 1b
add %o0, 0x1, %o0
/* If boot_cpu_id has not been setup by machine specific
* init-code above we default it to zero.
*/
sethi %hi(boot_cpu_id), %g2
ldub [%g2 + %lo(boot_cpu_id)], %g3
cmp %g3, 0xff
bne 1f
nop
mov %g0, %g3
stub %g3, [%g2 + %lo(boot_cpu_id)]
1: /* boot_cpu_id set. calculate boot_cpu_id4 = boot_cpu_id*4 */
sll %g3, 2, %g3
sethi %hi(boot_cpu_id4), %g2
stub %g3, [%g2 + %lo(boot_cpu_id4)]
/* Initialize the uwinmask value for init task just in case.
* But first make current_set[boot_cpu_id] point to something useful.
*/
set init_thread_union, %g6
set current_set, %g2
#ifdef CONFIG_SMP
sethi %hi(boot_cpu_id4), %g3
ldub [%g3 + %lo(boot_cpu_id4)], %g3
st %g6, [%g2]
add %g2, %g3, %g2
#endif