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x86: support very early printk() if desired

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Adapted from similar code in the x86_64 port.
Useful when debugging boot problems on actual x86
hardware if a JTAG isn't handy or feasible.

Turn this on for qemu_x86.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2019-08-01 13:04:53 -07:00 • committed by Andrew Boie
commit bd709c7322
5 changed files with 83 additions and 0 deletions
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9
arch/x86/include/ia32/kernel_arch_func.h
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@ -23,6 +23,11 @@ extern "C" {
extern K_THREAD_STACK_DEFINE(_interrupt_stack, CONFIG_ISR_STACK_SIZE);
#ifdef CONFIG_X86_VERY_EARLY_CONSOLE
/* Setup ultra-minimal serial driver for printk() */
void z_x86_early_serial_init(void);
#endif
/**
*
* @brief Performs architecture-specific initialization
@ -38,6 +43,10 @@ static inline void kernel_arch_init(void)
_kernel.nested = 0;
_kernel.irq_stack = Z_THREAD_STACK_BUFFER(_interrupt_stack) +
CONFIG_ISR_STACK_SIZE;
#ifdef CONFIG_X86_VERY_EARLY_CONSOLE
z_x86_early_serial_init();
#endif
#if CONFIG_X86_STACK_PROTECTION
z_x86_mmu_set_flags(&z_x86_kernel_pdpt, _interrupt_stack, MMU_PAGE_SIZE,
MMU_ENTRY_NOT_PRESENT, MMU_PTE_P_MASK);