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x86: move some per-cpu initialization to C

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No reason we need to stay in assembly domain once we have
GS and a stack set up.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2020-01-10 13:46:07 -08:00 • committed by Anas Nashif
commit 2690c9e550
4 changed files with 38 additions and 38 deletions
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25
arch/x86/core/intel64/cpu.c
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@ -117,3 +117,28 @@ void arch_start_cpu(int cpu_num, k_thread_stack_t *stack, int sz,
while (x86_cpuboot[cpu_num].ready == 0) {
}
}
/* Per-CPU initialization, C domain. On the first CPU, z_x86_prep_c is the
* next step. For other CPUs it is probably smp_init_top().
*/
FUNC_NORETURN void z_x86_cpu_init(struct x86_cpuboot *cpuboot)
{
x86_sse_init(NULL);
z_loapic_enable();
#ifdef CONFIG_USERSPACE
/* Set landing site for 'syscall' instruction */
z_x86_msr_write(X86_LSTAR_MSR, (u64_t)z_x86_syscall_entry_stub);
/* Set segment descriptors for syscall privilege transitions */
z_x86_msr_write(X86_STAR_MSR, (u64_t)X86_STAR_UPPER << 32);
/* Mask applied to RFLAGS when making a syscall */
z_x86_msr_write(X86_FMASK_MSR, EFLAGS_SYSCALL);
#endif
/* Enter kernel, never return */
cpuboot->ready++;
cpuboot->fn(cpuboot->arg);
}