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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>
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1 changed files with 41 additions and 32 deletions
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@ -372,36 +372,9 @@ execute_in_high_mem:
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sethi %hi(linux_dbvec), %g1
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st %o1, [%g1 + %lo(linux_dbvec)]
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/* Check if this is a LEON CPU.
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* Skip getprops call if it is
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/* Get the machine type via the romvec
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* getprops node operation
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*/
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srl %g3, PSR_IMPL_SHIFT, %g3
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and %g3, PSR_IMPL_SHIFTED_MASK, %g3
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cmp %g3, PSR_IMPL_LEON
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bne get_cputype
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/* LEON CPU - set boot_cpu_id */
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sethi %hi(boot_cpu_id), %g2 ! boot-cpu index
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#ifdef CONFIG_SMP
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ldub [%g2 + %lo(boot_cpu_id)], %g1
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cmp %g1, 0xff ! unset means first CPU
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bne leon_smp_cpu_startup ! continue only with master
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nop
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#endif
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/* Get CPU-ID from most significant 4-bit of ASR17 */
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rd %asr17, %g1
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srl %g1, 28, %g1
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/* Update boot_cpu_id only on boot cpu */
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stub %g1, [%g2 + %lo(boot_cpu_id)]
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ba continue_boot
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nop
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/* Get the machine type via the mysterious romvec node operations. */
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get_cputype:
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add %g7, 0x1c, %l1
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ld [%l1], %l0
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ld [%l0], %l0
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@ -420,10 +393,26 @@ get_cputype:
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! to a buf where above string
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! will get stored by the prom.
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/* Check to cputype. We may be booted on a sun4u (64 bit box),
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* and sun4d needs special treatment.
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*/
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/* Check value of "compatible" property.
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* "value" => "model"
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* leon => sparc_leon
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* sun4m => sun4m
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* sun4s => sun4m
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* sun4d => sun4d
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* sun4e => "no_sun4e_here"
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* '*' => "no_sun4u_here"
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* Check single letters only
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*/
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set cputypval, %o2
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/* If cputypval[0] == 'l' (lower case letter L) this is leon */
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ldub [%o2], %l1
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cmp %l1, 'l'
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be leon_init
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nop
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/* Check cputypval[4] to find the sun model */
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ldub [%o2 + 0x4], %l1
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cmp %l1, 'm'
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@ -438,6 +427,26 @@ get_cputype:
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b no_sun4u_here ! AIEEE, a V9 sun4u... Get our BIG BROTHER kernel :))
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nop
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leon_init:
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/* LEON CPU - set boot_cpu_id */
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sethi %hi(boot_cpu_id), %g2 ! boot-cpu index
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#ifdef CONFIG_SMP
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ldub [%g2 + %lo(boot_cpu_id)], %g1
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cmp %g1, 0xff ! unset means first CPU
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bne leon_smp_cpu_startup ! continue only with master
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nop
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#endif
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/* Get CPU-ID from most significant 4-bit of ASR17 */
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rd %asr17, %g1
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srl %g1, 28, %g1
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/* Update boot_cpu_id only on boot cpu */
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stub %g1, [%g2 + %lo(boot_cpu_id)]
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ba continue_boot
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nop
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/* CPUID in bootbus can be found at PA 0xff0140000 */
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#define SUN4D_BOOTBUS_CPUID 0xf0140000
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