forked from luck/tmp_suning_uos_patched
[ARM] Move read of processor ID out of lookup_processor_type()
Read the processor ID at boot, and save it in "processor_id" as we did before. Later, when we re-parse the CPU type in the setup.c code, re-use the value stored in "processor_id". This allows a cleaner work-around for noMMU devices without CP#15. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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@ -82,6 +82,7 @@
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ENTRY(stext)
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msr cpsr_c, #PSR_F_BIT | PSR_I_BIT | MODE_SVC @ ensure svc mode
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@ and irqs disabled
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mrc p15, 0, r9, c0, c0 @ get processor id
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bl __lookup_processor_type @ r5=procinfo r9=cpuid
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movs r10, r5 @ invalid processor (r5=0)?
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beq __error_p @ yes, error 'p'
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@ -156,6 +157,7 @@ ENTRY(secondary_startup)
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* as it has already been validated by the primary processor.
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*/
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msr cpsr_c, #PSR_F_BIT | PSR_I_BIT | MODE_SVC
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mrc p15, 0, r9, c0, c0 @ get processor id
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bl __lookup_processor_type
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movs r10, r5 @ invalid processor?
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moveq r0, #'p' @ yes, error 'p'
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@ -450,19 +452,19 @@ __error:
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* (and therefore, we are not in the correct address space). We have to
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* calculate the offset.
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*
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* r9 = cpuid
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* Returns:
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* r3, r4, r6 corrupted
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* r5 = proc_info pointer in physical address space
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* r9 = cpuid
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* r9 = cpuid (preserved)
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*/
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.type __lookup_processor_type, %function
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__lookup_processor_type:
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adr r3, 3f
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ldmda r3, {r5, r6, r9}
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sub r3, r3, r9 @ get offset between virt&phys
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ldmda r3, {r5 - r7}
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sub r3, r3, r7 @ get offset between virt&phys
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add r5, r5, r3 @ convert virt addresses to
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add r6, r6, r3 @ physical address space
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mrc p15, 0, r9, c0, c0 @ get processor id
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1: ldmia r5, {r3, r4} @ value, mask
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and r4, r4, r9 @ mask wanted bits
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teq r3, r4
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@ -477,10 +479,11 @@ __lookup_processor_type:
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* This provides a C-API version of the above function.
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*/
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ENTRY(lookup_processor_type)
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stmfd sp!, {r4 - r6, r9, lr}
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stmfd sp!, {r4 - r7, r9, lr}
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mov r9, r0
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bl __lookup_processor_type
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mov r0, r5
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ldmfd sp!, {r4 - r6, r9, pc}
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ldmfd sp!, {r4 - r7, r9, pc}
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/*
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* Look in include/asm-arm/procinfo.h and arch/arm/kernel/arch.[ch] for
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@ -278,7 +278,7 @@ int cpu_architecture(void)
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* These functions re-use the assembly code in head.S, which
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* already provide the required functionality.
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*/
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extern struct proc_info_list *lookup_processor_type(void);
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extern struct proc_info_list *lookup_processor_type(unsigned int);
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extern struct machine_desc *lookup_machine_type(unsigned int);
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static void __init setup_processor(void)
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@ -290,7 +290,7 @@ static void __init setup_processor(void)
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* types. The linker builds this table for us from the
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* entries in arch/arm/mm/proc-*.S
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*/
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list = lookup_processor_type();
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list = lookup_processor_type(processor_id);
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if (!list) {
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printk("CPU configuration botched (ID %08x), unable "
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"to continue.\n", processor_id);
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