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arch/x86: (Intel64) make z_arch_start_cpu() synchronous

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Don't leave z_arch_start_cpu() until the target CPU has been started.

Signed-off-by: Charles E. Youse <charles.youse@intel.com>
This commit is contained in:
Charles E. Youse 2019-09-30 18:16:16 -04:00 • committed by Anas Nashif
commit 5abab591c2
4 changed files with 7 additions and 1 deletions
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5
arch/x86/core/intel64/cpu.c
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@ -18,7 +18,7 @@
__weak u8_t x86_cpu_loapics[] = { 0, 1, 2, 3 };
extern FUNC_NORETURN void z_x86_prep_c(int, struct multiboot_info *);
extern FUNC_NORETURN void z_x86_prep_c(int dummy, struct multiboot_info *info);
extern char x86_ap_start[]; /* AP entry point in locore.S */
@ -110,4 +110,7 @@ void z_arch_start_cpu(int cpu_num, k_thread_stack_t *stack, int sz,
z_loapic_ipi(apic_id, LOAPIC_ICR_IPI_INIT, 0);
k_busy_wait(10000);
z_loapic_ipi(apic_id, LOAPIC_ICR_IPI_STARTUP, vector);
while (x86_cpuboot[cpu_num].ready == 0) {
}
}

1
arch/x86/core/intel64/locore.S
View file

@ -159,6 +159,7 @@ go64: movl %cr4, %eax /* enable PAE and SSE */
/* don't replace CALL with JMP; honor the ABI stack alignment! */
incl __x86_cpuboot_t_ready_OFFSET(%rbp)
movq __x86_cpuboot_t_arg_OFFSET(%rbp), %rsi
call *__x86_cpuboot_t_fn_OFFSET(%rbp) /* enter kernel; never return */

1
arch/x86/core/offsets/intel64_offsets.c
View file

@ -32,6 +32,7 @@ GEN_OFFSET_SYM(x86_tss64_t, ist1);
GEN_OFFSET_SYM(x86_tss64_t, cpu);
GEN_ABSOLUTE_SYM(__X86_TSS64_SIZEOF, sizeof(x86_tss64_t));
GEN_OFFSET_SYM(x86_cpuboot_t, ready);
GEN_OFFSET_SYM(x86_cpuboot_t, tr);
GEN_OFFSET_SYM(x86_cpuboot_t, gs);
GEN_OFFSET_SYM(x86_cpuboot_t, sp);

1
arch/x86/include/intel64/kernel_arch_data.h
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@ -83,6 +83,7 @@ typedef struct x86_tss64 x86_tss64_t;
*/
struct x86_cpuboot {
volatile int ready; /* CPU has started */
u16_t tr; /* selector for task register */
u16_t gs; /* selector for GS */
u64_t sp; /* initial stack pointer */