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贴一下代码,方便后来人学习
void notrace cpu_init(void)
{
unsigned int cpu = smp_processor_id();
struct stack *stk = &stacks[cpu];
if (cpu >= NR_CPUS) {
printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
BUG();
}
/*
* This only works on resume and secondary cores. For booting on the
* boot cpu, smp_prepare_boot_cpu is called after percpu area setup.
*/
set_my_cpu_offset(per_cpu_offset(cpu));
cpu_proc_init();
/*
* Define the placement constraint for the inline asm directive below.
* In Thumb-2, msr with an immediate value is not allowed.
*/
#ifdef CONFIG_THUMB2_KERNEL
#define PLC "r"
#else
#define PLC "I"
#endif
/*
* setup stacks for re-entrant exception handlers
*/
__asm__ (
"msr cpsr_c, %1\n\t"
"add r14, %0, %2\n\t"
"mov sp, r14\n\t"
"msr cpsr_c, %3\n\t"
"add r14, %0, %4\n\t"
"mov sp, r14\n\t"
"msr cpsr_c, %5\n\t"
"add r14, %0, %6\n\t"
"mov sp, r14\n\t"
"msr cpsr_c, %7"
:
: "r" (stk),
PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
"I" (offsetof(struct stack, irq[0])),
PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
"I" (offsetof(struct stack, abt[0])),
PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
"I" (offsetof(struct stack, und[0])),
PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
: "r14");
} |
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