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| author | Sam Ravnborg <sam@ravnborg.org> | 2012-05-29 12:14:12 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-05-29 23:47:36 +0400 |
| commit | 1ddb22e13dea3f9511c8e934331e1e44b666bc79 (patch) | |
| tree | e0e14e4b9a92a830c3733b0b9573ead9b995b4ac /arch/sparc | |
| parent | d4511e694ed9b903d8d3d3957180cabf23d2ee7f (diff) | |
| download | linux-1ddb22e13dea3f9511c8e934331e1e44b666bc79.tar.xz | |
sparc32,leon: fix leon bootup
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>
Diffstat (limited to 'arch/sparc')
| -rw-r--r-- | arch/sparc/kernel/head_32.S | 73 |
1 files changed, 41 insertions, 32 deletions
diff --git a/arch/sparc/kernel/head_32.S b/arch/sparc/kernel/head_32.S index cdc7f29ba17b..5364a05177c2 100644 --- a/arch/sparc/kernel/head_32.S +++ b/arch/sparc/kernel/head_32.S @@ -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 |