Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

sparc32,leon: fix leon bootup

Browse source 
head_32.S failed to set cputypval for leon, causing boot to fail.
The boot failed because we failed to recognize this was a LEON
cpu so we did not preoperly run-time patch the the kernel.
This resulted in an early crash.

Reported-by: Daniel Hellstrom <daniel@gaisler.com>
Tested-by: Daniel Hellstrom <daniel@gaisler.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Konrad Eisele <konrad@gaisler.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sam Ravnborg 2012-05-29 08:14:12 +00:00 committed by David S. Miller
parent d4511e694e
commit 1ddb22e13d
1 changed files with 41 additions and 32 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

73
arch/sparc/kernel/head_32.S
View file

@ -372,36 +372,9 @@ execute_in_high_mem:
sethi %hi(linux_dbvec), %g1
st %o1, [%g1 + %lo(linux_dbvec)]
/* Check if this is a LEON CPU.
* Skip getprops call if it is
/* Get the machine type via the romvec
* getprops node operation
*/
srl %g3, PSR_IMPL_SHIFT, %g3
and %g3, PSR_IMPL_SHIFTED_MASK, %g3
cmp %g3, PSR_IMPL_LEON
bne get_cputype
/* LEON CPU - set boot_cpu_id */
sethi %hi(boot_cpu_id), %g2 ! boot-cpu index
#ifdef CONFIG_SMP
ldub [%g2 + %lo(boot_cpu_id)], %g1
cmp %g1, 0xff ! unset means first CPU
bne leon_smp_cpu_startup ! continue only with master
nop
#endif
/* Get CPU-ID from most significant 4-bit of ASR17 */
rd %asr17, %g1
srl %g1, 28, %g1
/* Update boot_cpu_id only on boot cpu */
stub %g1, [%g2 + %lo(boot_cpu_id)]
ba continue_boot
nop
/* Get the machine type via the mysterious romvec node operations. */
get_cputype:
add %g7, 0x1c, %l1
ld [%l1], %l0
ld [%l0], %l0
@ -420,10 +393,26 @@ get_cputype:
! to a buf where above string
! will get stored by the prom.
/* Check to cputype. We may be booted on a sun4u (64 bit box),
* and sun4d needs special treatment.
*/
/* Check value of "compatible" property.
* "value" => "model"
* leon => sparc_leon
* sun4m => sun4m
* sun4s => sun4m
* sun4d => sun4d
* sun4e => "no_sun4e_here"
* '*' => "no_sun4u_here"
* Check single letters only
*/
set cputypval, %o2
/* If cputypval[0] == 'l' (lower case letter L) this is leon */
ldub [%o2], %l1
cmp %l1, 'l'
be leon_init
nop
/* Check cputypval[4] to find the sun model */
ldub [%o2 + 0x4], %l1
cmp %l1, 'm'
@ -438,6 +427,26 @@ get_cputype:
b no_sun4u_here ! AIEEE, a V9 sun4u... Get our BIG BROTHER kernel :))
nop
leon_init:
/* LEON CPU - set boot_cpu_id */
sethi %hi(boot_cpu_id), %g2 ! boot-cpu index
#ifdef CONFIG_SMP
ldub [%g2 + %lo(boot_cpu_id)], %g1
cmp %g1, 0xff ! unset means first CPU
bne leon_smp_cpu_startup ! continue only with master
nop
#endif
/* Get CPU-ID from most significant 4-bit of ASR17 */
rd %asr17, %g1
srl %g1, 28, %g1
/* Update boot_cpu_id only on boot cpu */
stub %g1, [%g2 + %lo(boot_cpu_id)]
ba continue_boot
nop
/* CPUID in bootbus can be found at PA 0xff0140000 */
#define SUN4D_BOOTBUS_CPUID 0xf0140000