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x86: generate page tables at runtime

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Removes very complex boot-time generation of page tables
with a much simpler runtime generation of them at bootup.

For those x86 boards that enable the MMU in the defconfig,
set the number of page pool pages appropriately.

The MMU_RUNTIME_* flags have been removed. They were an
artifact of the old page table generation and did not
correspond to any hardware state.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2019-07-31 14:21:14 -07:00 • committed by Andrew Boie
commit c3b3aafaec
15 changed files with 250 additions and 701 deletions
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10
arch/x86/include/ia32/kernel_arch_func.h
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@ -28,6 +28,9 @@ extern K_THREAD_STACK_DEFINE(_interrupt_stack, CONFIG_ISR_STACK_SIZE);
void z_x86_early_serial_init(void);
#endif
/* Create all page tables with boot configuration and enable paging */
void z_x86_paging_init(void);
/**
*
* @brief Performs architecture-specific initialization
@ -47,6 +50,9 @@ static inline void kernel_arch_init(void)
#ifdef CONFIG_X86_VERY_EARLY_CONSOLE
z_x86_early_serial_init();
#endif
#ifdef CONFIG_X86_MMU
z_x86_paging_init();
#endif
#if CONFIG_X86_STACK_PROTECTION
z_x86_mmu_set_flags(&z_x86_kernel_pdpt, _interrupt_stack, MMU_PAGE_SIZE,
MMU_ENTRY_READ, MMU_PTE_RW_MASK, true);
@ -95,6 +101,10 @@ static inline struct x86_mmu_pdpt *z_x86_pdpt_get(struct k_thread *thread)
return &header->kernel_data.pdpt;
}
#endif /* CONFIG_USERSPACE */
/* ASM code to fiddle with registers to enable the MMU with PAE paging */
void z_x86_enable_paging(void);
#include <stddef.h> /* For size_t */
#ifdef __cplusplus